技术领域technical field
本发明涉及缸内高压直喷天然气发动机的技术领域，特别地涉及微量柴油引燃缸内高压直喷天然气发动机燃料供给系统及用于操作该燃料供给系统的控制方法。The invention relates to the technical field of in-cylinder high-pressure direct-injection natural gas engines, in particular to a fuel supply system for in-cylinder high-pressure direct-injection natural gas engines ignited by a trace amount of diesel oil and a control method for operating the fuel supply system.
背景技术Background technique
近年来，天然气作为一种代用燃料由于在价格和储量方面的优势越来越受到重视。以天然气为主燃料的发动机各项排放值都有所降低，更易满足日益严格的排放法规，但普通预混燃烧天然气发动机由于压缩比受爆震限制导致热效率偏低、动力性低于同排量柴油机。微量柴油引燃高压直喷天然气发动机可以在保持与柴油机同等动力性的前提下达到良好的排放性能，具有良好的应用前景。In recent years, natural gas as an alternative fuel has been paid more and more attention due to its advantages in price and reserves. The emission values of engines using natural gas as the main fuel have been reduced, and it is easier to meet increasingly stringent emission regulations. However, due to the compression ratio of ordinary premixed combustion natural gas engines, the thermal efficiency is low and the power performance is lower than that of the same displacement due to the restriction of knocking. diesel engine. High-pressure direct-injection natural gas engines ignited with a trace amount of diesel can achieve good emission performance while maintaining the same power as diesel engines, and have good application prospects.
微量柴油引燃天然气缸内高压直喷与火花点火天然气缸内直喷发动机的工作过程有所不同，其技术方案是：在压缩冲程后期，预先喷入少量柴油作为引燃源，主喷天然气以高压形式喷入气缸，天然气在柴油形成的火核中扩散燃烧，燃烧速度较快，燃烧温度较低。The working process of the high-pressure direct injection engine ignited by a trace amount of diesel is different from that of the spark-ignited natural gas direct injection engine. The high-pressure form is injected into the cylinder, and the natural gas diffuses and burns in the fire core formed by the diesel oil, with a faster combustion speed and a lower combustion temperature.
这种天然气发动机的关键技术在于对引燃柴油和主燃料天然气喷射过程的控制。目前该型发动机喷射压力的控制方式为单电控，ECU仅对柴油轨压进行控制，天然气轨压通过机械装置调节，与柴油轨压保持定压差，无法根据发动机运行工况实现轨压的灵活调节，限制发动机综合性能的进一步提升。The key technology of this natural gas engine lies in the control of the process of pilot diesel and main fuel natural gas injection. At present, the injection pressure control method of this type of engine is single electronic control, and the ECU only controls the diesel rail pressure. The natural gas rail pressure is adjusted by a mechanical device to maintain a constant pressure difference with the diesel rail pressure, and the rail pressure cannot be adjusted according to the engine operating conditions. Flexible adjustment to limit the further improvement of the overall performance of the engine.
发明内容Contents of the invention
为解决现有技术存在的不足，本发明公开了微量柴油引燃直喷天然气发动机燃料供给系统及控制方法，供给系统包括电控共轨引燃柴油供给装置和电控共轨高压直喷天然气供给装置，根据发动机的运转工况，通过电控系统控制引燃柴油喷射压力和主喷天然气的喷射压力，实现发动机快速低排放高效燃烧的目的。In order to solve the deficiencies in the prior art, the present invention discloses a fuel supply system and a control method for a trace diesel pilot direct injection natural gas engine. The supply system includes an electronically controlled common rail pilot diesel supply device and an electronically controlled common rail high pressure direct injection natural gas supply The device, according to the operating conditions of the engine, controls the injection pressure of the pilot diesel and the main injection of natural gas through the electronic control system to achieve the purpose of fast, low-emission and high-efficiency combustion of the engine.
为实现上述目的，本发明的具体方案如下：To achieve the above object, the specific scheme of the present invention is as follows:
微量柴油引燃直喷天然气发动机燃料供给系统，包括：通过电控系统分别控制的电控共轨引燃柴油供给装置及电控共轨高压直喷天然气供给装置，所述电控系统根据天然气发动机的工况通过控制电控共轨引燃柴油供给装置的柴油压力调节模块调节供给天然气发动机一定压力的引燃柴油，电控系统根据天然气发动机的工况通过控制电控共轨高压直喷天然气供给装置的天然气压力调节模块来调节供给天然气发动机一定压力的主喷天然气。The fuel supply system for micro-diesel pilot ignition direct injection natural gas engine includes: an electronically controlled common rail pilot ignition diesel supply device and an electronically controlled common rail high pressure direct injection natural gas supply device respectively controlled by the electronic control system. According to the working conditions of the natural gas engine, the electronic control system controls the electronically controlled common rail high pressure direct injection natural gas supply The natural gas pressure adjustment module of the device is used to adjust the main injection natural gas supplied to the natural gas engine at a certain pressure.
所述电控共轨引燃柴油供给装置，包括柴油罐，柴油罐与柴油滤清器相连，柴油滤清器与柴油泵的输入端相连，柴油泵的输出端一路与柴油罐相连，另一路与柴油压力调节模块相连，柴油压力调节模块与柴油轨相连，柴油轨及柴油泵均与电控喷射泵相连。The electronically controlled common rail ignition diesel supply device includes a diesel tank, the diesel tank is connected to the diesel filter, the diesel filter is connected to the input end of the diesel pump, one output end of the diesel pump is connected to the diesel tank, and the other It is connected with the diesel pressure regulation module, the diesel pressure regulation module is connected with the diesel rail, and both the diesel rail and the diesel pump are connected with the electronically controlled injection pump.
所述电控共轨高压直喷天然气供给装置，包括天然气罐，天然气罐通过天然气加压模块与天然气缓冲罐相连，天然气缓冲罐与天然气压力调节模块相连，天然气压力调节模块与天然气轨相连，天然气轨与电控喷射泵相连。The electronically controlled common rail high-pressure direct injection natural gas supply device includes a natural gas tank, the natural gas tank is connected to the natural gas buffer tank through the natural gas pressurization module, the natural gas buffer tank is connected to the natural gas pressure regulating module, the natural gas pressure regulating module is connected to the natural gas rail, and the natural gas The rail is connected to the electronically controlled injection pump.
所述电控系统还与柴油泵、柴油压力调节模块、天然气压力调节模块、柴油轨压传感器、天然气轨压传感器、电控喷射器、转速传感器及进气压力传感器相连。The electronic control system is also connected with a diesel pump, a diesel pressure regulating module, a natural gas pressure regulating module, a diesel rail pressure sensor, a natural gas rail pressure sensor, an electronically controlled injector, a rotational speed sensor and an intake air pressure sensor.
所述天然气发动机与电控喷射器相连，天然气发动机的进空气端的管道上设置有中冷器，天然气发动机的进空气端的管道与出空气端的管道之间设置有增压器；所述天然气发动机的进空气端的管道上还依次连接有空气滤清器及进气压力传感器。The natural gas engine is connected with an electronically controlled injector, an intercooler is arranged on the pipeline of the air inlet end of the natural gas engine, and a supercharger is arranged between the pipeline of the air inlet end of the natural gas engine and the pipeline of the air outlet end; An air filter and an intake pressure sensor are also connected in sequence to the pipeline at the air inlet end.
所述天然气发动机的一侧还安装有转速传感器，所述天然气轨的一端安装有天然气轨压传感器，所述柴油轨的一端安装有柴油轨压传感器。A rotational speed sensor is installed on one side of the natural gas engine, a natural gas rail pressure sensor is installed on one end of the natural gas rail, and a diesel rail pressure sensor is installed on one end of the diesel rail.
所述天然气缓冲罐与天然气压力调节模块之间还安装有天然气流量计，所述柴油滤清器与柴油泵之间还安装有柴油油耗仪。A natural gas flow meter is also installed between the natural gas buffer tank and the natural gas pressure regulating module, and a diesel fuel consumption meter is also installed between the diesel oil filter and the diesel pump.
微量柴油引燃直喷天然气发动机燃料供给系统的控制方法，包括：A method for controlling the fuel supply system of a direct-injection natural gas engine fueled by a trace amount of diesel, including:
步骤一：电控系统根据预设柴油轨压、柴油喷射定时及预设天然气轨压、及天然气喷射定时对发动机燃料供给系统进行控制；Step 1: The electronic control system controls the engine fuel supply system according to the preset diesel rail pressure, diesel injection timing, preset natural gas rail pressure, and natural gas injection timing;
步骤二：根据天然气发动机的各项参数值对柴油轨压、柴油喷射定时及预设天然气轨压、及天然气喷射定时进行优化，电控系统根据优化参数对天然气发动机燃料供给系统进行调节；Step 2: optimize the diesel rail pressure, diesel injection timing, preset natural gas rail pressure, and natural gas injection timing according to various parameter values of the natural gas engine, and the electronic control system adjusts the fuel supply system of the natural gas engine according to the optimized parameters;
步骤三：根据柴油油耗仪、燃气流量计及各传感器的测量结果对天然气发动机的动力性、经济性和排放性进行综合性能评价，如性能满足使用需求，进行下一工况点的参数优化，如不满足要求，则对本工况点进行进一步的优化；Step 3: According to the measurement results of the diesel fuel consumption meter, gas flow meter and various sensors, conduct a comprehensive performance evaluation on the power, economy and emission of the natural gas engine. If the performance meets the use requirements, optimize the parameters of the next working point. If the requirements are not met, further optimize this working point;
步骤四：对发动机所有典型工况点进行逐个标定。Step 4: Carry out calibration one by one for all typical working condition points of the engine.
本发明的有益效果：Beneficial effects of the present invention:
本发明的供给系统包括电控共轨引燃柴油供给装置和电控共轨高压直喷天然气供给装置，根据发动机的运转工况，通过电控系统控制引燃柴油喷射压力和主喷天然气的喷射压力，实现发动机快速低排放高效燃烧的,在不采用或采用简单后处理的情况下达到国Ⅳ排放标准目的。The supply system of the present invention includes an electronically controlled common rail pilot diesel fuel supply device and an electronically controlled common rail high pressure direct injection natural gas supply device. According to the operating conditions of the engine, the injection pressure of the pilot diesel oil and the injection of the main injection natural gas are controlled by the electronic control system Pressure, to achieve fast and low-emission high-efficiency combustion of the engine, and to meet the national IV emission standard without using or using simple after-treatment.
附图说明Description of drawings
图1本发明的一个实施方式的微量柴油引燃缸内高压直喷天然气发动机燃料供给系统工作示意图；Fig. 1 schematic diagram of the operation of the high-pressure direct-injection natural gas engine fuel supply system in the trace diesel pilot combustion cylinder of an embodiment of the present invention;
图2本发明的一个实施方式用于操作该燃料供给系统的控制策略的逻辑流程图；Figure 2 is a logic flow diagram of a control strategy for operating the fuel supply system according to an embodiment of the present invention;
图中，101柴油罐，102柴油轨压传感器，103柴油轨，104电控系统，105天然气轨，106转速传感器，107天然气发动机，108电控喷射器，109增压器，110中冷器，111进气压力传感器，112空气滤清器，113天然气罐，114天然气加压模块，115天然气缓冲罐，116天然气流量计，117天然气轨压传感器，118天然气压力调节模块，119柴油压力调节模块，121柴油泵，122柴油油耗仪，123柴油滤清器。In the figure, 101 diesel tank, 102 diesel rail pressure sensor, 103 diesel rail, 104 electronic control system, 105 natural gas rail, 106 speed sensor, 107 natural gas engine, 108 electronic control injector, 109 supercharger, 110 intercooler, 111 Intake air pressure sensor, 112 Air filter, 113 Natural gas tank, 114 Natural gas pressurization module, 115 Natural gas buffer tank, 116 Natural gas flow meter, 117 Natural gas rail pressure sensor, 118 Natural gas pressure adjustment module, 119 Diesel pressure adjustment module, 121 diesel pump, 122 diesel fuel consumption meter, 123 diesel filter.
具体实施方式：detailed description:
下面结合附图对本发明进行详细说明：The present invention is described in detail below in conjunction with accompanying drawing:
如图1所示，微量柴油引燃直喷天然气发动机燃料供给系统，包括：通过电控系统104分别控制的电控共轨引燃柴油供给装置及电控共轨高压直喷天然气供给装置，所述电控系统104根据天然气发动机107的工况通过控制电控共轨引燃柴油供给装置的柴油压力调节模块119调节供给天然气发动机107一定压力的引燃柴油，电控系统104根据天然气发动机107的工况通过控制电控共轨高压直喷天然气供给装置的天然气压力调节模块118来调节供给天然气发动机107一定压力的主喷天然气。As shown in Fig. 1 , the fuel supply system for a trace diesel pilot direct injection natural gas engine includes: an electronically controlled common rail pilot diesel fuel supply device and an electronically controlled common rail high pressure direct injection natural gas supply device respectively controlled by an electronic control system 104. According to the working conditions of the natural gas engine 107, the electronic control system 104 regulates the diesel oil pressure regulation module 119 of the electronically controlled common rail pilot diesel supply device to supply a certain pressure of the natural gas engine 107. In the working condition, the main injection natural gas supplied to the natural gas engine 107 at a certain pressure is adjusted by controlling the natural gas pressure regulation module 118 of the electronically controlled common rail high-pressure direct injection natural gas supply device.
电控共轨引燃柴油供给装置，包括柴油罐101，柴油罐101与柴油滤清器123相连，柴油滤清器123与柴油泵121的输入端相连，柴油泵121的输出端一路与柴油罐101相连，另一路与柴油压力调节模块119相连，柴油压力调节模块119与柴油轨103相连，柴油轨103及柴油泵121均与电控喷射泵108相连。The electronically controlled common rail ignition diesel supply device includes a diesel tank 101, which is connected to a diesel filter 123, which is connected to the input end of the diesel pump 121, and whose output end is connected to the diesel tank 121. 101 is connected, the other is connected with the diesel pressure regulation module 119, the diesel pressure regulation module 119 is connected with the diesel rail 103, and the diesel rail 103 and the diesel pump 121 are both connected with the electronically controlled injection pump 108.
电控共轨高压直喷天然气供给装置，包括天然气罐113，天然气罐113通过天然气加压模块114与天然气缓冲罐115相连，天然气缓冲罐115与天然气压力调节模块118相连，天然气压力调节模块118与天然气轨105相连，天然气轨105与电控喷射泵108相连。The electronically controlled common rail high-pressure direct injection natural gas supply device includes a natural gas tank 113, the natural gas tank 113 is connected to the natural gas buffer tank 115 through the natural gas pressurization module 114, the natural gas buffer tank 115 is connected to the natural gas pressure regulating module 118, and the natural gas pressure regulating module 118 is connected to the The natural gas rail 105 is connected, and the natural gas rail 105 is connected with an electronically controlled injection pump 108 .
电控系统104还与柴油泵121、柴油压力调节模块119、天然气压力调节模块118、柴油轨压传感器102、天然气轨压传感器117、电控喷射器108、转速传感器106及进气压力传感器111相连。The electronic control system 104 is also connected with the diesel pump 121, the diesel pressure regulation module 119, the natural gas pressure regulation module 118, the diesel rail pressure sensor 102, the natural gas rail pressure sensor 117, the electronically controlled injector 108, the speed sensor 106 and the intake pressure sensor 111 .
天然气发动机107与电控喷射器108相连，天然气发动机107的进空气端的管道上设置有中冷器110，天然气发动机107的进空气端的管道与出空气端的管道之间设置有增压器109；所述天然气发动机107的进空气端的管道上还依次连接有空气滤清器112及进气压力传感器111。The natural gas engine 107 is connected with the electronically controlled injector 108, an intercooler 110 is arranged on the pipeline of the air inlet end of the natural gas engine 107, and a supercharger 109 is arranged between the pipeline of the air inlet end of the natural gas engine 107 and the pipeline of the air outlet end; An air filter 112 and an intake air pressure sensor 111 are sequentially connected to the pipeline at the air intake end of the natural gas engine 107 .
天然气发动机107的一侧还安装有转速传感器106，所述天然气轨105的一端安装有天然气轨压传感器117，所述柴油轨103的一端安装有柴油轨压传感器102。A speed sensor 106 is installed on one side of the natural gas engine 107 , a natural gas rail pressure sensor 117 is installed on one end of the natural gas rail 105 , and a diesel rail pressure sensor 102 is installed on one end of the diesel rail 103 .
天然气缓冲罐115与天然气压力调节模块118之间还安装有天然气流量计116，所述柴油滤清器123与柴油泵121之间还安装有柴油油耗仪122。A natural gas flow meter 116 is also installed between the natural gas buffer tank 115 and the natural gas pressure regulating module 118 , and a diesel fuel consumption meter 122 is also installed between the diesel filter 123 and the diesel pump 121 .
工作原理：天然气发动机的燃气供给系统包括电控引燃柴油供给装置和电控主燃料天然气供给装置。电控引燃柴油供给装置，发动机在不同工况下运转时，柴油经柴油罐101，在柴油滤清器123中过滤后，经柴油泵121加压后进入柴油压力调压模块119，电控系统ECU根据转速传感器106反馈的转速信号等参数结合柴油轨压传感器102反馈的轨压信号通过柴油压力调节模块119调节柴油轨103的供给压力。电控主燃料天然气供给装置，液化天然气从天然气罐113中流出后，经天然气加压模块114汽化加压，在缓冲罐115中稳压后，安装在天然气管路中的天然气流量计116测量天然气流量，然后进入天然气压力调节模块118，电控系统ECU104根据空气流量发动机转速等参数结合天然气轨压传感器117反馈轨压对天然气设计轨压进行计算修正，并通过天然气压力调节模块118调节天然气轨105供给压力。Working principle: The gas supply system of a natural gas engine includes an electronically controlled pilot diesel supply device and an electronically controlled main fuel natural gas supply device. Electronically controlled ignition diesel supply device, when the engine is running under different working conditions, the diesel oil passes through the diesel tank 101, is filtered in the diesel filter 123, is pressurized by the diesel pump 121, and then enters the diesel pressure regulation module 119. The system ECU adjusts the supply pressure of the diesel rail 103 through the diesel pressure adjustment module 119 according to parameters such as the rotational speed signal fed back by the rotational speed sensor 106 and combined with the rail pressure signal fed back by the diesel rail pressure sensor 102 . The electronically controlled main fuel natural gas supply device. After the liquefied natural gas flows out of the natural gas tank 113, it is vaporized and pressurized by the natural gas pressurization module 114. After the pressure is stabilized in the buffer tank 115, the natural gas flowmeter 116 installed in the natural gas pipeline measures the natural gas. The flow rate then enters the natural gas pressure adjustment module 118, and the electronic control system ECU104 calculates and corrects the natural gas design rail pressure according to parameters such as the air flow rate and engine speed combined with the rail pressure fed back by the natural gas rail pressure sensor 117, and adjusts the natural gas rail 105 through the natural gas pressure adjustment module 118. supply pressure.
在本发明的一个实施方式中，电控系统ECU104同时控制柴油压力调节模块119及天然气压力调节模块118，以根据发动机的运转工况同时控制柴油和天然气共轨压力，实现两种燃料轨压的灵活控制。In one embodiment of the present invention, the electronic control system ECU104 simultaneously controls the diesel pressure regulation module 119 and the natural gas pressure regulation module 118, so as to simultaneously control the common rail pressure of diesel and natural gas according to the operating conditions of the engine, so as to realize the pressure adjustment of the two fuel rails. Flexible control.
在本发明的又一实施方式，所述柴油轨压调节模块119所供给的柴油轨压由电控系统ECU104根据发动机转速、扭矩参数和预先标定的MAP图确定，并经过柴油轨压传感器102反馈的实测轨压进行修正。In yet another embodiment of the present invention, the diesel rail pressure supplied by the diesel rail pressure regulation module 119 is determined by the electronic control system ECU104 according to the engine speed, torque parameters and the pre-calibrated MAP map, and fed back by the diesel rail pressure sensor 102 The measured rail pressure is corrected.
在本发明的又一实施方式，所述天然气轨压调节模块118所供给的天然气轨压由电控系统ECU104根据发动机转速、扭矩参数和预先标定的MAP图确定，并经过天然气轨压传感器117反馈的实测轨压进行修正。In another embodiment of the present invention, the natural gas rail pressure supplied by the natural gas rail pressure adjustment module 118 is determined by the electronic control system ECU104 according to the engine speed, torque parameters and pre-calibrated MAP map, and fed back by the natural gas rail pressure sensor 117 The measured rail pressure is corrected.
在本发明的再一实施方式，天然气轨压调节与柴油轨压调节有一定相关性，但天然气轨压调节与柴油轨压调节过程相互独立，压差可随工况点的变化而变化，由电控系统ECU104分别控制柴油和天然气压力调节模块进行调节。In yet another embodiment of the present invention, there is a certain correlation between natural gas rail pressure regulation and diesel rail pressure regulation, but the natural gas rail pressure regulation and diesel rail pressure regulation processes are independent of each other, and the pressure difference can change with the change of the operating point, by The electronic control system ECU104 separately controls the diesel and natural gas pressure regulation modules for regulation.
如图2所示，微量柴油引燃直喷天然气发动机燃料供给系统的控制方法，包括：As shown in Figure 2, the control method for the fuel supply system of the direct-injection natural gas engine with trace diesel ignition includes:
首先在步骤S201，电控系统104根据预设柴油轨压、柴油喷射定时及预设天然气轨压、及天然气喷射定时对发动机燃料供给系统进行控制。First, in step S201, the electronic control system 104 controls the engine fuel supply system according to the preset diesel rail pressure, diesel injection timing and preset natural gas rail pressure and natural gas injection timing.
步骤S202，根据所测量的油耗率、各项排放值(CO排放、HC排放及NOx排放)等参数对发动机的动力性、经济性、排放性进行综合分析对经过传感器测量的发动机参数值的测试结果进行分析。Step S202, according to the measured fuel consumption rate, various emission values (CO emission, HC emission, and NOx emission) and other parameters, comprehensively analyze the power, economy, and emission of the engine, and test the engine parameter values measured by the sensor The results are analyzed.
步骤S203，根据测试分析结果对柴油轨压、柴油喷射定时及预设天然气轨压、及天然气喷射定时进行优化(优化的过程为通过对天然气、柴油轨压及喷射定时的调节，达到理想的发动机综合性能，即动力性、经济性、排放性的综合指标达到最优)，电控系统根据优化参数对发动机燃料供给系统进行调节。Step S203, optimize the diesel rail pressure, diesel injection timing, preset natural gas rail pressure, and natural gas injection timing according to the test and analysis results (the optimization process is to achieve an ideal engine by adjusting the natural gas, diesel rail pressure, and injection timing. The comprehensive performance, that is, the comprehensive indicators of power, economy and emission are optimized), and the electronic control system adjusts the engine fuel supply system according to the optimized parameters.
步骤S204，根据油耗仪、燃气流量计等仪器和各传感器的测量结果对发动机的动力性、经济性和排放性进行综合性能评价，如性能满足使用需求，进行下一工况点的参数优化，如不满足要求，则对本工况点进行进一步的优化。Step S204, according to the fuel consumption meter, gas flow meter and other instruments and the measurement results of various sensors, perform a comprehensive performance evaluation on the power, economy and emission of the engine. If the performance meets the use requirements, optimize the parameters of the next working point, If the requirements are not met, further optimization is carried out on this operating point.
接着，在步骤S205根据发动机的使用要求，重复步骤S201-S204对发动机外特性及万有特性所有典型工况点进行逐个标定，使其经济性、动力性和排放性满足设计指标。Next, in step S205, according to the use requirements of the engine, repeat steps S201-S204 to calibrate all typical operating points of the external characteristics and universal characteristics of the engine one by one, so that the economy, power and emission meet the design indicators.
需要说明的是，在上文中以微量柴油引燃高压直喷天然气发动机燃气供给系统的例子对本发明进行了描述。然而，本发明并不限于此，而是可以适用于现有的或者将来出现的其他混合燃料电喷共轨发动机。It should be noted that the present invention has been described above with the example of a gas supply system for a high-pressure direct-injection natural gas engine ignited by a trace amount of diesel. However, the present invention is not limited thereto, but can be applied to other existing or future mixed-fuel electric injection common rail engines.
| Application Number | Priority Date | Filing Date | Title |
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| CN201410352491.6ACN104121102B (en) | 2014-07-23 | 2014-07-23 | Fuel supply system and control method for micro diesel pilot direct injection natural gas engine |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410352491.6ACN104121102B (en) | 2014-07-23 | 2014-07-23 | Fuel supply system and control method for micro diesel pilot direct injection natural gas engine |
| Publication Number | Publication Date |
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| CN104121102A CN104121102A (en) | 2014-10-29 |
| CN104121102Btrue CN104121102B (en) | 2016-03-23 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201410352491.6AExpired - Fee RelatedCN104121102B (en) | 2014-07-23 | 2014-07-23 | Fuel supply system and control method for micro diesel pilot direct injection natural gas engine |
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