技术领域technical field
本发明涉及发动机技术领域，更具体地说，涉及一种废气再循环系统、机动车及废气再循环系统的控制方法。The invention relates to the technical field of engines, more specifically, to an exhaust gas recirculation system, a motor vehicle and a control method for the exhaust gas recirculation system.
背景技术Background technique
废气再循环系统(EGR系统)是发动机降低NOx排放的有效手段之一；EGR系统是通过将一部分发动机废气引到发动机进气管，废气被重新引入气缸参与燃烧，可降低缸内氧浓度和最高燃烧温度，达到降低NOx的效果。The exhaust gas recirculation system (EGR system) is one of the effective means for the engine to reduce NOx emissions; the EGR system introduces part of the engine exhaust gas to the engine intake pipe, and the exhaust gas is reintroduced into the cylinder to participate in combustion, which can reduce the oxygen concentration in the cylinder and the maximum combustion. temperature to achieve the effect of reducing NOx.
EGR系统中，发动机进气管的废气进入质量与气缸的总气体质量的比值为EGR率，为了使得EGR系统能够进一步降低NOx的排放，就需要提高EGR系统的EGR率；目前提高EGR率的方式主要为：设置对发动机的进气进行冷却的进气中冷器，对发动机排出的废气进行冷却的EGR冷却器，且在EGR冷却器的出气管、进气中冷器的出气管、及发动机的进气总管之间设置进气节流阀；通过进气节流阀，控制EGR冷却器的出气管的废气和进气中冷器的出气管的进气进入进气总管，实现EGR率的提升。In the EGR system, the ratio of the exhaust gas entering the engine intake pipe to the total gas mass of the cylinder is the EGR rate. In order to make the EGR system further reduce NOx emissions, it is necessary to increase the EGR rate of the EGR system; the current way to increase the EGR rate is mainly In order to: install the air intake intercooler for cooling the intake air of the engine, the EGR cooler for cooling the exhaust gas discharged from the engine, and the air outlet pipe of the EGR cooler, the air outlet pipe of the air intake intercooler, and the engine An air intake throttle valve is set between the intake manifolds; through the intake throttle valve, the exhaust gas of the outlet pipe of the EGR cooler and the intake air of the outlet pipe of the intake intercooler are controlled to enter the intake manifold to achieve an increase in the EGR rate .
然而，这种通过在EGR冷却器的出气管、进气中冷器的出气管、及发动机的进气总管之间设置进气节流阀提高EGR率的方式，由于在进气总管处设置了进气节流阀，增加了发动机的泵气损失、降低了发动机的进气量，导致发动机的油耗上升，颗粒物排放的增加。Yet this mode that improves the EGR rate by arranging the intake throttle valve between the air outlet pipe of the EGR cooler, the air outlet pipe of the air intake intercooler, and the intake manifold of the engine is due to the fact that the intake manifold is provided with The air intake throttle valve increases the pumping loss of the engine and reduces the intake air volume of the engine, which leads to an increase in the fuel consumption of the engine and an increase in particulate matter emissions.
发明内容Contents of the invention
有鉴于此，本发明实施例提供一种废气再循环系统、机动车及废气再循环系统的控制方法，以解决现有提高EGR率的方式所存在的增加发动机的泵气损失、降低了发动机的进气量，导致发动机的油耗上升，颗粒物排放的增加的问题。In view of this, an embodiment of the present invention provides an exhaust gas recirculation system, a motor vehicle and a control method for the exhaust gas recirculation system, to solve the problems of increasing the pumping loss of the engine and reducing the engine's pumping loss in the existing methods of increasing the EGR rate. The amount of air intake leads to an increase in the fuel consumption of the engine and an increase in the emission of particulate matter.
为实现上述目的，本发明实施例提供如下技术方案：In order to achieve the above purpose, embodiments of the present invention provide the following technical solutions:
一种废气再循环系统，包括：EGR冷前管路，EGR冷却器，EGR冷后管路，发动机，进气总管，排气总管和EGR蝶阀；An exhaust gas recirculation system, comprising: EGR cold front pipeline, EGR cooler, EGR after cold pipeline, engine, intake manifold, exhaust manifold and EGR butterfly valve;
其中，发动机的至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；所述EGR冷前管路与所述EGR冷却器的进气口相连；所述EGR冷后管路的一端与所述EGR冷却器的出气口相连，另一端与所述进气总管相连；所述进气总管与所述发动机的进气歧管相连；Wherein, at least one exhaust manifold of the engine is connected to the exhaust manifold and the EGR cold front pipeline through the EGR butterfly valve; the EGR cold front pipeline is connected to the air inlet of the EGR cooler; One end of the road is connected with the air outlet of the EGR cooler, and the other end is connected with the intake manifold; the intake manifold is connected with the intake manifold of the engine;
当所述EGR蝶阀处于第一状态时，所述至少一个排气歧管与所述EGR冷前管路导通，且所述至少一个排气歧管与所述排气总管不导通，所述至少一个排气歧管排出的废气经所述EGR冷前管路进入所述EGR冷却器进行冷却，冷却的废气经所述EGR冷后管路输入所述进气总管，由所述进气总管将冷却的废气经所述进气歧管导入所述发动机；When the EGR butterfly valve is in the first state, the at least one exhaust manifold is connected to the EGR cold front pipeline, and the at least one exhaust manifold is not connected to the exhaust manifold, so The exhaust gas discharged from the at least one exhaust manifold enters the EGR cooler through the EGR cooling pipeline for cooling, and the cooled exhaust gas enters the intake manifold through the EGR cooling pipeline, and the intake air a manifold directs cooled exhaust gases to the engine through the intake manifold;
当所述EGR蝶阀处于第二状态时，所述至少一个排气歧管与所述EGR冷前管路不导通，且所述至少一个排气歧管与所述排气总管导通，所述至少一个排气歧管排出的废气经所述排气总管排出；所述第一状态与所述第二状态不同。When the EGR butterfly valve is in the second state, the at least one exhaust manifold is not connected to the EGR cold front pipeline, and the at least one exhaust manifold is connected to the exhaust main pipe, so The exhaust gas discharged from the at least one exhaust manifold is discharged through the exhaust manifold; the first state is different from the second state.
其中，所述废气再循环系统还包括：涡轮增压器，中冷前进气管，中冷器和中冷后进气管；Wherein, the exhaust gas recirculation system further includes: a turbocharger, an intercooled intake pipe, an intercooler and an intercooled rear intake pipe;
其中，所述涡轮增压器分别与所述排气总管和所述中冷前进气管相连；所述中冷前进气管与所述中冷器的进气口相连；所述中冷后进气管的一端与所述中冷器的出气口相连，另一端与所述进气总管相连；所述涡轮增压器输出的空气经所述中冷前进气管进入所述中冷器，由所述中冷器冷却后，通过所述中冷后进气管输入所述进气总管；Wherein, the turbocharger is respectively connected with the exhaust manifold and the intercooler inlet pipe; the intercooler inlet pipe is connected with the air inlet of the intercooler; one end of the intercooler rear inlet pipe is It is connected with the air outlet of the intercooler, and the other end is connected with the air intake manifold; the air output from the turbocharger enters the intercooler through the intercooler intake pipe, and the intercooler After cooling, enter the air intake main pipe through the intercooled air intake pipe;
当所述EGR蝶阀处于第一状态时，所述中冷器输入所述进气总管的空气，与所述EGR冷却器输入所述进气总管的冷却废气混合后进入所述发动机。When the EGR butterfly valve is in the first state, the air input from the intercooler into the intake manifold mixes with the cooled exhaust gas input from the EGR cooler into the intake manifold before entering the engine.
其中，所述废气再循环系统还包括：Wherein, the exhaust gas recirculation system further includes:
感应所述发动机的转速的转速传感器；a speed sensor for sensing the speed of the engine;
感应所述发动机的水温的温度传感器。A temperature sensor that senses the water temperature of the engine.
其中，所述废气再循环系统还包括：分别与所述转速传感器和所述温度传感器相连，对所述EGR蝶阀的状态进行控制的控制器；Wherein, the exhaust gas recirculation system further includes: a controller connected to the rotational speed sensor and the temperature sensor respectively to control the state of the EGR butterfly valve;
所述控制器在所述转速传感器感应的发动机转速处于设定转速范围，且所述温度传感器感应的发动机水温处于设定温度范围时，控制所述EGR蝶阀处于第一状态；在所述转速传感器感应的发动机转速不处于设定转速范围，且所述温度传感器感应的发动机水温不处于设定温度范围时，控制所述EGR蝶阀处于第二状态。The controller controls the EGR butterfly valve to be in the first state when the engine speed sensed by the speed sensor is within a set speed range and the engine water temperature sensed by the temperature sensor is within a set temperature range; When the sensed engine speed is not in the set speed range and the engine water temperature sensed by the temperature sensor is not in the set temperature range, the EGR butterfly valve is controlled to be in the second state.
其中，所述控制器为ECU。Wherein, the controller is an ECU.
其中，所述第一状态为所述EGR蝶阀处于全开状态，所述第二状态为所述EGR蝶阀处于全关状态。Wherein, the first state is that the EGR butterfly valve is fully open, and the second state is that the EGR butterfly valve is fully closed.
本发明实施例还提供一种机动车，包括上述所述的废气再循环系统。An embodiment of the present invention also provides a motor vehicle, including the exhaust gas recirculation system described above.
本发明实施例还提供一种废气再循环系统的控制方法，基于上述所述的废气再循环系统；所述方法基于控制器，所述方法包括：An embodiment of the present invention also provides a control method for an exhaust gas recirculation system, based on the above-mentioned exhaust gas recirculation system; the method is based on a controller, and the method includes:
检测发动机的工作状态；Detect the working status of the engine;
在发动机的工作状态满足预定条件时，向EGR蝶阀输出第一信号，所述第一信号用于控制EGR蝶阀处于第一状态，使得EGR蝶阀导通所述发动机的至少一个排气歧管与EGR冷前管路，且不导通所述至少一个排气歧管与所述排气总管，以使所述至少一个排气歧管排出的废气经所述EGR冷前管路进入EGR冷却器进行冷却，冷却的废气经EGR冷后管路输入进气总管，由所述进气总管将冷却的废气经发动机的进气歧管导入所述发动机，其中，所述至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；When the working state of the engine satisfies the predetermined condition, a first signal is output to the EGR butterfly valve, and the first signal is used to control the EGR butterfly valve to be in the first state, so that the EGR butterfly valve conducts at least one exhaust manifold of the engine and the EGR The cold front pipeline, and the at least one exhaust manifold and the exhaust manifold are not connected, so that the exhaust gas discharged from the at least one exhaust manifold enters the EGR cooler through the EGR cold front pipeline Cooling, the cooled exhaust gas enters the intake manifold through the EGR cooling pipeline, and the cooled exhaust gas is introduced into the engine through the intake manifold of the engine through the intake manifold, wherein the at least one exhaust manifold passes through the EGR The butterfly valve is connected with the exhaust manifold and the EGR cold front pipeline;
在发动机的工作状态不满足预定条件时，向EGR蝶阀输出第二信号，所述第二信号用于控制EGR蝶阀处于第二状态，使得EGR蝶阀不导通所述至少一个排气歧管与所述EGR冷前管路，且导通所述至少一个排气歧管与所述排气总管，以使所述至少一个排气歧管排出的废气经所述排气总管排出；其中，所述第一状态与所述第二状态不同。When the working state of the engine does not meet the predetermined condition, a second signal is output to the EGR butterfly valve, and the second signal is used to control the EGR butterfly valve to be in the second state, so that the EGR butterfly valve does not connect the at least one exhaust manifold with the The EGR cold front pipeline, and the at least one exhaust manifold and the exhaust manifold are connected, so that the exhaust gas discharged from the at least one exhaust manifold is discharged through the exhaust manifold; wherein, the The first state is different from the second state.
其中，所述检测发动机工作状态包括：Wherein, the detection engine working state includes:
获取感应所述发动机的转速的转速传感器所传输的转速数据，检测所述发动机的转速；及获取感应所述发动机的水温的温度传感器所传输的温度数据，检测所述发动机的水温。Obtaining rotational speed data transmitted by a rotational speed sensor that senses the rotational speed of the engine to detect the rotational speed of the engine; and obtaining temperature data transmitted by a temperature sensor that senses the water temperature of the engine to detect the water temperature of the engine.
其中，所述发动机的工作状态满足预定条件包括：Wherein, the working state of the engine meeting predetermined conditions includes:
发动机转速处于设定转速范围，且发动机水温处于设定温度范围；The engine speed is within the set speed range, and the engine water temperature is within the set temperature range;
所述发动机的工作状态不满足预定条件包括：The working state of the engine does not meet the predetermined conditions including:
发动机转速不处于设定转速范围，且发动机水温不处于设定温度范围。The engine speed is not in the set speed range, and the engine water temperature is not in the set temperature range.
基于上述技术方案，本发明实施例提供的废气再循环系统通过设置发动机的至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；使得可通过控制EGR蝶阀的状态，实现至少一个排气歧管与所述EGR冷前管路的导通控制，及所述至少一个排气歧管与所述排气总管的导通控制；从而在所述至少一个排气歧管与所述EGR冷前管路导通时，可使得所述至少一个排气歧管排出的废气经所述EGR冷前管路进入所述EGR冷却器进行冷却，冷却的废气经所述EGR冷后管路输入所述进气总管，由所述进气总管将冷却的废气经所述进气歧管导入所述发动机，实现EGR率的提高；在所述至少一个排气歧管与所述排气总管导通时，可使得所述至少一个排气歧管排出的废气经所述排气总管排出，此时发动机无废气进入，无EGR。本发明实施例提供的废气再循环系统，通过设置控制至少一个排气歧管与所述EGR冷前管路的导通状态，及控制所述至少一个排气歧管与所述排气总管的导通状态的EGR蝶阀，实现了EGR率的提升；且本发明实施例提供的实现EGR率提升的系统结构及废气再循环控制方式均较为简单，同时由于避免采用进气节流阀，减少了发动机泵气损失、进气量降低的情况发生，使得废气再循环系统更为彻底的降低发动机的NOx的排放。Based on the above technical solutions, the exhaust gas recirculation system provided by the embodiments of the present invention is connected to the exhaust main pipe and the EGR cold front pipeline through the EGR butterfly valve by setting at least one exhaust manifold of the engine; so that the state of the EGR butterfly valve can be controlled to realize The conduction control of at least one exhaust manifold and the EGR cold front pipeline, and the conduction control of the at least one exhaust manifold and the exhaust main pipe; so that the at least one exhaust manifold and the When the EGR cold front pipeline is turned on, the exhaust gas discharged from the at least one exhaust manifold can enter the EGR cooler through the EGR cold front pipeline for cooling, and the cooled exhaust gas is cooled by the EGR The pipeline is input into the intake manifold, and the cooled exhaust gas is introduced into the engine through the intake manifold by the intake manifold, so as to realize the improvement of the EGR rate; between the at least one exhaust manifold and the exhaust gas When the gas main pipe is turned on, the exhaust gas discharged from the at least one exhaust manifold can be discharged through the exhaust main pipe. At this time, no exhaust gas enters the engine and there is no EGR. The exhaust gas recirculation system provided by the embodiment of the present invention controls the conduction state between at least one exhaust manifold and the EGR cold front pipeline, and controls the connection between the at least one exhaust manifold and the exhaust main pipe. The EGR butterfly valve in the conduction state realizes the improvement of the EGR rate; and the system structure and the exhaust gas recirculation control method for realizing the EGR rate increase provided by the embodiment of the present invention are relatively simple, and at the same time, due to the avoidance of the intake throttle valve, the reduction of The engine pumping loss and the reduction of the intake air volume occur, so that the exhaust gas recirculation system can more thoroughly reduce the NOx emission of the engine.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.
图1为本发明实施例提供的废气再循环系统的结构示意图；Fig. 1 is a schematic structural diagram of an exhaust gas recirculation system provided by an embodiment of the present invention;
图2为本发明实施例提供的废气再循环系统的另一结构示意图；Fig. 2 is another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention;
图3为本发明实施例提供的废气再循环系统的再一结构示意图；Fig. 3 is another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention;
图4为本发明实施例提供的废气再循环系统的又一结构示意图；Fig. 4 is another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention;
图5为本发明实施例提供的废气再循环系统的又另一结构示意图；Fig. 5 is yet another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention;
图6为本发明实施例提供的废气再循环系统的又再一结构示意图；Fig. 6 is yet another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention;
图7为本发明实施例提供的废气再循环系统的控制方法的流程图。Fig. 7 is a flow chart of the control method of the exhaust gas recirculation system provided by the embodiment of the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
图1为本发明实施例提供的废气再循环系统的结构示意图，参照图1，该废气再循环系统可以包括：EGR冷前管路1，EGR冷却器2，EGR冷后管路3，发动机4，进气总管5，排气总管6和EGR蝶阀7；Fig. 1 is a structural schematic diagram of an exhaust gas recirculation system provided by an embodiment of the present invention. Referring to Fig. 1, the exhaust gas recirculation system may include: EGR pre-cooling pipeline 1, EGR cooler 2, EGR post-cooling pipeline 3, engine 4 , intake manifold 5, exhaust manifold 6 and EGR butterfly valve 7;
其中，发动机4的至少一个排气歧管41通过EGR蝶阀7和排气总管6及EGR冷前管路1相连；Wherein, at least one exhaust manifold 41 of the engine 4 is connected to the exhaust manifold 6 and the EGR cold front pipeline 1 through the EGR butterfly valve 7;
可选的，本发明实施例提供的发动机4可以为多缸发动机，发动机4的至少一缸的排气歧管41，可通过EGR蝶阀7和排气总管6及EGR冷前管路1相连。图1为便于示意仅示出了六缸发动机情况下，第六缸排气歧管通过EGR蝶阀7和排气总管6及EGR冷前管路1相连的示意；显然，本发明实施例提供的发动机4还可以是其他缸数的发动机(如4缸等)，可以有多个排气歧管41通过EGR蝶阀7和排气总管6及EGR冷前管路1相连；作为示例，图2示出了六缸发动机情况下，第五缸、第六缸排气歧管通过EGR蝶阀7和排气总管6及EGR冷前管路1相连的示意，可进行参照。Optionally, the engine 4 provided by the embodiment of the present invention can be a multi-cylinder engine, and the exhaust manifold 41 of at least one cylinder of the engine 4 can be connected with the exhaust manifold 6 and the EGR cold front pipeline 1 through the EGR butterfly valve 7 . Fig. 1 only shows the schematic diagram that under the situation of the six-cylinder engine, the exhaust manifold of the sixth cylinder is connected with the exhaust manifold 6 and the EGR cold front pipeline 1 through the EGR butterfly valve 7 for the convenience of illustration; obviously, the embodiment of the present invention provides Engine 4 can also be the engine (as 4 cylinders etc.) of other cylinder numbers, can have a plurality of exhaust manifolds 41 to be connected with exhaust manifold 6 and EGR cold front pipeline 1 by EGR butterfly valve 7; As an example, Fig. 2 shows In the case of a six-cylinder engine, the illustration that the exhaust manifolds of the fifth cylinder and the sixth cylinder are connected with the exhaust manifold 6 and the EGR cold front pipeline 1 through the EGR butterfly valve 7 can be used for reference.
需要说明的是，本发明对于其他缸数的发动机，及其他数量的排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连的情况并无法穷举说明；在图1和图2所示说明下，本领域技术人员可知晓多数量排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连的结构；对于其他缸数的发动机，及其他数量的排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连的连接原理，可与前文所示类似。It should be noted that the present invention can not exhaustively describe the situation that the present invention is connected to the engine of other cylinder numbers and the exhaust manifolds of other numbers through the EGR butterfly valve and the exhaust manifold and the EGR cold front pipeline; in Fig. 1 and Fig. 2 Under the description shown, those skilled in the art can know the structure that a large number of exhaust manifolds are connected to the exhaust manifold and the EGR cold front pipeline through the EGR butterfly valve; for engines with other cylinder numbers, and other numbers of exhaust manifolds through The connection principle between the EGR butterfly valve and the exhaust manifold and the EGR cold front pipeline can be similar to that shown above.
回到图1所示，EGR冷前管路1与EGR冷却器2的进气口相连；EGR冷后管路3的一端与EGR冷却器2的出气口相连，另一端与进气总管5相连；进气总管5与发动机4的进气歧管42相连。Returning to Figure 1, the EGR pre-cooling pipeline 1 is connected to the air inlet of the EGR cooler 2; one end of the EGR cooling pipeline 3 is connected to the air outlet of the EGR cooler 2, and the other end is connected to the intake manifold 5 ; The intake manifold 5 is connected to the intake manifold 42 of the engine 4 .
本发明实施例提供的废气再循环系统，进行废气再循环的过程可以如下：In the exhaust gas recirculation system provided in the embodiment of the present invention, the process of performing exhaust gas recirculation can be as follows:
当EGR蝶阀7处于第一状态时，第一状态可以为EGR蝶阀7处于全开状态，如图3所示，图1和图2所示为EGR蝶阀7处于半开状态；则至少一个排气歧管41与EGR冷前管路1导通，且至少一个排气歧管41与排气总管6不导通，至少一个排气歧管41排出的废气经EGR冷前管路1进入EGR冷却器2进行冷却，冷却的废气经EGR冷后管路3输入进气总管5，由进气总管5将冷却的废气经发动机的进气歧管42导入发动机；从而提升发动机的废气进气量，提高EGR率；When the EGR butterfly valve 7 is in the first state, the first state can be that the EGR butterfly valve 7 is fully open, as shown in Figure 3, and Figure 1 and Figure 2 show that the EGR butterfly valve 7 is in a half-open state; then at least one exhaust The manifold 41 is connected to the EGR cold front pipeline 1, and at least one exhaust manifold 41 is not connected to the exhaust manifold 6, and the exhaust gas discharged from at least one exhaust manifold 41 enters the EGR cooling through the EGR cold front pipeline 1 2 for cooling, the cooled exhaust gas enters the intake manifold 5 through the EGR cooling pipeline 3, and the cooled exhaust gas is introduced into the engine through the intake manifold 42 of the engine by the intake manifold 5; thereby increasing the intake air volume of the exhaust gas of the engine, Increase EGR rate;
当EGR蝶阀7处于第二状态时，第一状态可与第二状态不同，第二状态可以为EGR蝶阀7处于全关状态，如图4所示；则至少一个排气歧管41与EGR冷前管路1不导通，且至少一个排气歧管41与排气总管6导通，至少一个排气歧管41排出的废气经排气总管6排出；此时发动机无废气进入，发动机无废气再循环过程。When the EGR butterfly valve 7 is in the second state, the first state can be different from the second state, and the second state can be that the EGR butterfly valve 7 is in a fully closed state, as shown in Figure 4; then at least one exhaust manifold 41 and the EGR cooling The front pipeline 1 is not connected, and at least one exhaust manifold 41 is connected to the exhaust manifold 6, and the exhaust gas discharged from at least one exhaust manifold 41 is discharged through the exhaust manifold 6; Exhaust gas recirculation process.
可以看出，本发明实施例提供的废气再循环系统通过设置发动机的至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；使得可通过控制EGR蝶阀的状态，实现至少一个排气歧管与所述EGR冷前管路的导通控制，及所述至少一个排气歧管与所述排气总管的导通控制；从而在所述至少一个排气歧管与所述EGR冷前管路导通时，可使得所述至少一个排气歧管排出的废气经所述EGR冷前管路进入所述EGR冷却器进行冷却，冷却的废气经所述EGR冷后管路输入所述进气总管，由所述进气总管将冷却的废气经所述进气歧管导入所述发动机，实现EGR率的提高；在所述至少一个排气歧管与所述排气总管导通时，可使得所述至少一个排气歧管排出的废气经所述排气总管排出，此时发动机无废气进入，无EGR。本发明实施例提供的废气再循环系统，通过设置控制至少一个排气歧管与所述EGR冷前管路的导通状态，及控制所述至少一个排气歧管与所述排气总管的导通状态的EGR蝶阀，实现了EGR率的提升；且本发明实施例提供的实现EGR率提升的系统结构及废气再循环控制方式均较为简单，同时由于避免采用进气节流阀，减少了发动机泵气损失、进气量降低的情况发生，使得废气再循环系统更为彻底的降低发动机的NOx的排放。It can be seen that the exhaust gas recirculation system provided by the embodiments of the present invention is connected to the exhaust main pipe and the EGR cold front pipeline by setting at least one exhaust manifold of the engine through the EGR butterfly valve; so that at least The conduction control of an exhaust manifold and the EGR cold front pipeline, and the conduction control of the at least one exhaust manifold and the exhaust main pipe; so that the at least one exhaust manifold and the When the EGR cold front pipeline is turned on, the exhaust gas discharged from the at least one exhaust manifold can enter the EGR cooler through the EGR cold front pipeline for cooling, and the cooled exhaust gas passes through the EGR after cooling pipe. The air intake manifold is input into the intake manifold, and the exhaust gas cooled by the intake manifold is introduced into the engine through the intake manifold to realize the improvement of the EGR rate; between the at least one exhaust manifold and the exhaust gas When the main pipe is turned on, the exhaust gas discharged from the at least one exhaust manifold can be discharged through the exhaust main pipe. At this time, no exhaust gas enters the engine and there is no EGR. The exhaust gas recirculation system provided by the embodiment of the present invention controls the conduction state between at least one exhaust manifold and the EGR cold front pipeline, and controls the connection between the at least one exhaust manifold and the exhaust main pipe. The EGR butterfly valve in the conduction state realizes the improvement of the EGR rate; and the system structure and the exhaust gas recirculation control method for realizing the EGR rate increase provided by the embodiment of the present invention are relatively simple, and at the same time, due to the avoidance of the intake throttle valve, the reduction of The engine pumping loss and the reduction of the intake air volume occur, so that the exhaust gas recirculation system can more thoroughly reduce the NOx emission of the engine.
图5为本发明实施例提供的废气再循环系统的又另一结构示意图，结合图1和图5所示，该废气再循环系统还可以包括：涡轮增压器8，中冷前进气管9，中冷器10和中冷后进气管11；Fig. 5 is yet another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention. In combination with Fig. 1 and Fig. 5, the exhaust gas recirculation system may further include: a turbocharger 8, an intercooled intake pipe 9, intercooler 10 and intercooler intake pipe 11;
其中，涡轮增压器8分别与排气总管6和中冷前进气管9相连；中冷前进气管9与中冷器10的进气口相连；中冷后进气管11的一端与中冷器10的出气口相连，另一端与进气总管5相连；Wherein, the turbocharger 8 is connected with the exhaust manifold 6 and the intercooler inlet pipe 9 respectively; the intercooler inlet pipe 9 is connected with the air inlet of the intercooler 10; The air outlet is connected, and the other end is connected with the intake manifold 5;
在本发明实施例中，排气总管6排出的发动机排气歧管的废气可进入涡轮增压器8中；涡轮增压器8具有输出新鲜空气的功能(如压入外界空气)，涡轮增压器8输出的空气可经中冷前进气管9进入中冷器10，由中冷器10冷却后，通过中冷后进气管11输入进气总管5。In the embodiment of the present invention, the waste gas of the exhaust manifold of the engine exhausted by the exhaust manifold 6 can enter the turbocharger 8; The air output by the compressor 8 can enter the intercooler 10 through the intercooler intake pipe 9 , and after being cooled by the intercooler 10 , enter the air intake manifold 5 through the intercooler rear intake pipe 11 .
图5所示废气再循环系统的废气再循环过程可以如下：The exhaust gas recirculation process of the exhaust gas recirculation system shown in Figure 5 can be as follows:
当EGR蝶阀7处于第一状态时，至少一个排气歧管41与EGR冷前管路1导通，且至少一个排气歧管41与排气总管6不导通；至少一个排气歧管41排出的废气经EGR冷前管路1进入EGR冷却器2进行冷却，冷却的废气经EGR冷后管路3输入进气总管5；同时，涡轮增压器8输出的空气可经中冷前进气管9进入中冷器10，由中冷器10冷却后，通过中冷后进气管11输入进气总管5；中冷器10输入进气总管5的空气，与EGR冷却器2输入进气总管5的冷却废气混合后，将进入发动机，实现EGR率的较大幅度提升；When the EGR butterfly valve 7 is in the first state, at least one exhaust manifold 41 is connected to the EGR cold front pipeline 1, and at least one exhaust manifold 41 is not connected to the exhaust main pipe 6; at least one exhaust manifold 41 Exhaust gas enters the EGR cooler 2 through the EGR cooling pre-cooling pipeline 1 for cooling, and the cooled exhaust gas enters the intake manifold 5 through the EGR cooling pipeline 3; at the same time, the air output from the turbocharger 8 can go through the intercooler The air pipe 9 enters the intercooler 10, and after being cooled by the intercooler 10, it enters the air intake manifold 5 through the air intake pipe 11 after the intercooler; the intercooler 10 enters the air in the intake manifold 5, and enters the air intake manifold 5 with the EGR cooler 2 After the cooled exhaust gas is mixed, it will enter the engine to achieve a relatively large increase in the EGR rate;
当EGR蝶阀7处于第二状态时，至少一个排气歧管41与EGR冷前管路1不导通，且至少一个排气歧管41与排气总管6导通，至少一个排气歧管41排出的废气经排气总管6排入涡轮增压器8；此时，进入发动机的仅有中冷器10输入进气总管5的空气。When the EGR butterfly valve 7 is in the second state, at least one exhaust manifold 41 is not connected to the EGR cold front pipeline 1, and at least one exhaust manifold 41 is connected to the exhaust manifold 6, and at least one exhaust manifold 41 is connected to the exhaust manifold 6. The exhaust gas discharged from 41 is discharged into the turbocharger 8 through the exhaust manifold 6; at this time, only the air entering the engine from the intercooler 10 into the intake manifold 5 enters the engine.
可选的，本发明实施例可将发动机的多缸排气全部作为EGR引入发动机的进气口，实现较大的EGR率。经实验研究，引入一个缸的发动机排气可实现16.7％的EGR率，引入两个缸的发动机排气可实现33.3％的EGR率，而且最大EGR率不受发动机运行工况限制，不受涡轮增压器运行效率影响。Optionally, in the embodiment of the present invention, all the multi-cylinder exhaust gas of the engine can be introduced into the intake port of the engine as EGR, so as to achieve a larger EGR rate. According to experimental research, the introduction of engine exhaust from one cylinder can achieve an EGR rate of 16.7%, and the introduction of engine exhaust from two cylinders can achieve an EGR rate of 33.3%, and the maximum EGR rate is not limited by the operating conditions of the engine, nor by the turbine. Influence of supercharger operating efficiency.
可选的，本发明实施例可对发动机的工作状态进行检测，在检测到发动机的工作状态满足预定条件时，可控制EGR蝶阀处于第一状态，在检测到发动机的工作状态不满足预定条件时，可控制EGR蝶阀处于第二状态；具体的，发动机的工作状态可以为发动机的转速、水温等，可通过转速传感器和温度传感器检测，EGR蝶阀的状态控制可由控制器实现。Optionally, the embodiment of the present invention can detect the working state of the engine. When it is detected that the working state of the engine meets the predetermined condition, the EGR butterfly valve can be controlled to be in the first state. When it is detected that the working state of the engine does not meet the predetermined condition , the EGR butterfly valve can be controlled to be in the second state; specifically, the working state of the engine can be the engine speed, water temperature, etc., which can be detected by the speed sensor and the temperature sensor, and the state control of the EGR butterfly valve can be realized by the controller.
对应的，图6示出了本发明实施例提供的废气再循环系统的又再一结构示意图，结合图5和图6所示，该废气再循环系统还可以包括：转速传感器12，温度传感器13和控制器14；Correspondingly, FIG. 6 shows yet another structural schematic diagram of the exhaust gas recirculation system provided by the embodiment of the present invention. As shown in FIG. 5 and FIG. and controller 14;
其中，转速传感器12可感应所述发动机的转速，将感应的转速数据传输至控制器14；Wherein, the rotational speed sensor 12 can sense the rotational speed of the engine, and transmit the sensed rotational speed data to the controller 14;
温度传感器13可感应所述发动机的水温，将感应的水温数据传输至控制器14；The temperature sensor 13 can sense the water temperature of the engine, and transmit the sensed water temperature data to the controller 14;
控制器14可对EGR蝶阀的状态进行控制；具体的，控制器14可在所述转速传感器感应的发动机转速处于设定转速范围，且所述温度传感器感应的发动机水温处于设定温度范围时，控制所述EGR蝶阀处于第一状态；在所述转速传感器感应的发动机转速不处于设定转速范围，且所述温度传感器感应的发动机水温不处于设定温度范围时，控制所述EGR蝶阀处于第二状态。The controller 14 can control the state of the EGR butterfly valve; specifically, the controller 14 can when the engine speed sensed by the speed sensor is in the set speed range, and the engine water temperature sensed by the temperature sensor is in the set temperature range, Control the EGR butterfly valve to be in the first state; when the engine speed sensed by the speed sensor is not in the set speed range, and the engine water temperature sensed by the temperature sensor is not in the set temperature range, control the EGR butterfly valve in the first state Two states.
可选的，设定转速范围，设定温度范围的具体值可根据发动机的实际运行需要标定。Optionally, the specific values of the set speed range and the set temperature range can be calibrated according to the actual operation needs of the engine.
可选的，控制器14可以为ECU(Electronic Control Unit，电子控制单元)。Optionally, the controller 14 may be an ECU (Electronic Control Unit, electronic control unit).
本发明实施例提供的废气再循环系统，通过设置控制至少一个排气歧管与所述EGR冷前管路的导通状态，及控制所述至少一个排气歧管与所述排气总管的导通状态的EGR蝶阀，实现了EGR率的提升；本发明实现EGR率提升的系统结构及废气再循环控制方式均较为简单，同时由于避免了采用进气节流阀，减少了发动机泵气损失、进气量降低的情况发生，使得废气再循环系统更为彻底的降低发动机的NOx的排放。The exhaust gas recirculation system provided by the embodiment of the present invention controls the conduction state between at least one exhaust manifold and the EGR cold front pipeline, and controls the connection between the at least one exhaust manifold and the exhaust main pipe. The EGR butterfly valve in the conduction state realizes the improvement of the EGR rate; the system structure and the exhaust gas recirculation control mode of the present invention to realize the increase of the EGR rate are relatively simple, and at the same time, the engine pumping loss is reduced due to the avoidance of the intake throttle valve , The reduction of the intake air volume occurs, which makes the exhaust gas recirculation system more thoroughly reduce the NOx emission of the engine.
本发明实施例还提供一种机动车，该机动车可以包括上述所述的废气再循环系统。An embodiment of the present invention also provides a motor vehicle, which may include the exhaust gas recirculation system described above.
下面对本发明实施例提供的废气再循环系统的控制方法进行介绍，下文描述的废气再循环系统的控制方法可基于上文描述的废气再循环系统。The control method of the EGR system provided by the embodiment of the present invention is introduced below, and the control method of the EGR system described below may be based on the EGR system described above.
图7为本发明实施例提供的废气再循环系统的控制方法的流程图，该方法可基于上文所述的废气再循环系统，该方法可基于控制器，实现废气再循环的自动控制；参照图7，该方法可以包括：Fig. 7 is a flow chart of the control method of the exhaust gas recirculation system provided by the embodiment of the present invention, the method can be based on the above-mentioned exhaust gas recirculation system, and the method can realize the automatic control of the exhaust gas recirculation based on the controller; refer to Figure 7, the method may include:
步骤S100、检测发动机的工作状态；Step S100, detecting the working state of the engine;
可选的，发动机的工作状态可以包括发动机的转速和发动机的水温；本发明实施例可通过转速传感器感应发动机的转速，获取转速传感器所传输的转速数据，从而实现发动机转速的检测；本发明实施例可通过温度传感器感应发动机的水温，获取温度传感器所传输的温度数据，从而实现发动机水温的检测。Optionally, the working state of the engine may include the speed of the engine and the water temperature of the engine; in the embodiment of the present invention, the speed of the engine may be sensed by the speed sensor, and the speed data transmitted by the speed sensor may be obtained, thereby realizing the detection of the speed of the engine; the implementation of the present invention For example, the temperature sensor can be used to sense the water temperature of the engine, and the temperature data transmitted by the temperature sensor can be obtained, so as to realize the detection of the engine water temperature.
步骤S110、在发动机的工作状态满足预定条件时，向EGR蝶阀输出第一信号，所述第一信号用于控制EGR蝶阀处于第一状态，使得EGR蝶阀导通所述发动机的至少一个排气歧管与EGR冷前管路，且不导通所述至少一个排气歧管与排气总管，以使所述至少一个排气歧管排出的废气经所述EGR冷前管路进入EGR冷却器进行冷却，冷却的废气经EGR冷后管路输入进气总管，由所述进气总管将冷却的废气经发动机的进气歧管导入所述发动机，其中，所述至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；Step S110, when the working state of the engine satisfies the predetermined condition, output a first signal to the EGR butterfly valve, the first signal is used to control the EGR butterfly valve to be in the first state, so that the EGR butterfly valve conducts at least one exhaust manifold of the engine pipe and the EGR cold front pipeline, and the at least one exhaust manifold and the exhaust manifold are not connected, so that the exhaust gas discharged from the at least one exhaust manifold enters the EGR cooler through the EGR cold front pipeline cooling, the cooled exhaust gas is fed into the intake manifold through the EGR cooling pipeline, and the cooled exhaust gas is introduced into the engine through the intake manifold of the engine through the intake manifold, wherein the at least one exhaust manifold passes through The EGR butterfly valve is connected to the exhaust manifold and the EGR cold front pipeline;
可选的，发动机的工作状态满足预定条件可以为，发动机转速处于设定转速范围，且发动机水温处于设定温度范围。Optionally, the working state of the engine meeting the predetermined condition may be that the engine speed is within a set speed range, and the engine water temperature is within a set temperature range.
步骤S120、在发动机的工作状态不满足预定条件时，向EGR蝶阀输出第二信号，所述第二信号用于控制EGR蝶阀处于第二状态，使得EGR蝶阀不导通所述至少一个排气歧管与所述EGR冷前管路，且导通所述至少一个排气歧管与所述排气总管，以使所述至少一个排气歧管排出的废气经所述排气总管排出；其中，所述第一状态与所述第二状态不同。Step S120, when the working state of the engine does not meet the predetermined condition, output a second signal to the EGR butterfly valve, the second signal is used to control the EGR butterfly valve to be in the second state, so that the EGR butterfly valve does not conduct the at least one exhaust manifold Pipe and the EGR cold front pipeline, and connect the at least one exhaust manifold and the exhaust manifold, so that the exhaust gas discharged from the at least one exhaust manifold is discharged through the exhaust manifold; wherein , the first state is different from the second state.
可选的，发动机的工作状态不满足预定条件可以为，发动机转速不处于设定转速范围，且发动机水温不处于设定温度范围。Optionally, the condition that the working state of the engine does not meet the predetermined condition may be that the engine speed is not in the set speed range, and the engine water temperature is not in the set temperature range.
本发明实施例提供的废气再循环系统的控制方法的一个应用为：在机动车上设置上文所述的废气再循环系统，将发动机的至少一个排气歧管通过EGR蝶阀和排气总管及EGR冷前管路相连；转速传感器感应发动机的转速，将转速数据传输至机动车的ECU，温度传感器感应发动机的水温，将温度数据传输至机动车的ECU；An application of the control method of the exhaust gas recirculation system provided by the embodiment of the present invention is: the above-mentioned exhaust gas recirculation system is installed on the motor vehicle, and at least one exhaust manifold of the engine passes through the EGR butterfly valve and the exhaust main pipe and The EGR cold front pipeline is connected; the speed sensor senses the speed of the engine and transmits the speed data to the ECU of the vehicle; the temperature sensor senses the water temperature of the engine and transmits the temperature data to the ECU of the vehicle;
ECU在获取转速数据和温度数据后，若确定发动机转速处于设定转速范围，且发动机水温处于设定温度范围，则向EGR蝶阀输出第一信号，使得EGR蝶阀导通所述发动机的至少一个排气歧管与EGR冷前管路，且不导通所述至少一个排气歧管与所述排气总管，以使中冷器输入进气总管的空气，与EGR冷却器输入进气总管的冷却废气混合后进入发动机中，提高EGR率；After obtaining the speed data and temperature data, if the ECU determines that the engine speed is within the set speed range and the engine water temperature is within the set temperature range, it will output a first signal to the EGR butterfly valve so that the EGR butterfly valve conducts at least one exhaust port of the engine. The air manifold and the EGR cooling front pipeline, and the at least one exhaust manifold and the exhaust manifold are not connected, so that the air that the intercooler enters the intake manifold and the air that the EGR cooler enters the intake manifold The cooled exhaust gas is mixed and enters the engine to increase the EGR rate;
ECU在获取转速数据和温度数据后，若确定发动机转速不处于设定转速范围，且发动机水温不处于设定温度范围，则向EGR蝶阀输出第二信号，使得EGR蝶阀不导通所述至少一个排气歧管与所述EGR冷前管路，而导通所述至少一个排气歧管与所述排气总管；以使所述至少一个排气歧管排出的废气经所述排气总管排出，同时，进入发动机的气体仅为中冷器输入进气总管的空气。After acquiring the speed data and temperature data, if the ECU determines that the engine speed is not in the set speed range and the engine water temperature is not in the set temperature range, it outputs a second signal to the EGR butterfly valve so that the EGR butterfly valve does not conduct the at least one The exhaust manifold and the EGR cold front pipeline are connected to the at least one exhaust manifold and the exhaust manifold; so that the exhaust gas discharged from the at least one exhaust manifold passes through the exhaust manifold Exhaust, meanwhile, enters the engine only as air enters the intake manifold from the intercooler.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.
专业人员还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210167.5ACN104895705A (en) | 2015-04-28 | 2015-04-28 | Waste gas recirculating system, motor vehicle, and control method of waste gas recirculating system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210167.5ACN104895705A (en) | 2015-04-28 | 2015-04-28 | Waste gas recirculating system, motor vehicle, and control method of waste gas recirculating system |
| Publication Number | Publication Date |
|---|---|
| CN104895705Atrue CN104895705A (en) | 2015-09-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510210167.5APendingCN104895705A (en) | 2015-04-28 | 2015-04-28 | Waste gas recirculating system, motor vehicle, and control method of waste gas recirculating system |
| Country | Link |
|---|---|
| CN (1) | CN104895705A (en) |
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