技术领域technical field
本发明涉及车辆性能测试领域，尤其涉及一种耐高压油箱泄漏诊断方法。The invention relates to the field of vehicle performance testing, in particular to a method for diagnosing leakage of a high-pressure fuel tank.
背景技术Background technique
随着排放法规从国五向国六升级，对蒸发系统的技术要求日益提高，其要求主要为如下几点：With the upgrading of emission regulations from China V to China VI, the technical requirements for the evaporation system are increasing, and the requirements are mainly as follows:
1）新增燃油系统泄露的诊断1) Added fuel system leak diagnosis
2）加严的蒸发排放要求2) Tightened evaporative emission requirements
3）新增加油过程排放要求3) Add emission requirements for refueling process
当前，在传统汽油发动机车辆上，针对技术要求1），可以使用一种诊断气泵向燃油系统（油箱，炭罐）充气，以判断燃油系统，特别是油箱是否存在泄漏。Currently, on traditional gasoline engine vehicles, for technical requirement 1), a diagnostic air pump can be used to inflate the fuel system (fuel tank, carbon canister) to determine whether there is leakage in the fuel system, especially the fuel tank.
但随着油耗要求越来越高，传统汽油发动机已逐渐无法满足油耗要求，因此使用发动机和电机共同驱动的混合动力汽车日益普及。目前在混合动力车型上普遍使用一种耐高压油箱，其可将较高压力的燃油蒸汽封闭在油箱内。为了实现这一目的，在油箱与炭罐相连接的管路上还增加了一个可控的油箱隔离阀，以帮助将高压的燃油蒸汽封闭在耐高压油箱内。However, as fuel consumption requirements are getting higher and higher, traditional gasoline engines are gradually unable to meet fuel consumption requirements, so hybrid vehicles driven by both engines and electric motors are becoming more and more popular. At present, a high-pressure resistant fuel tank is generally used on hybrid vehicles, which can seal higher-pressure fuel vapor in the fuel tank. In order to achieve this purpose, a controllable fuel tank isolation valve is added to the pipeline connecting the fuel tank and the carbon canister to help seal the high-pressure fuel vapor in the high-pressure resistant fuel tank.
由于耐高压油箱和油箱隔离阀的存在，当油箱隔离阀关闭时，原本用于测试燃油系统泄漏的气泵无法直接向油箱充气，而为了诊断油箱泄漏目的，在油箱仍存在高压情况下就贸然打开油箱隔离阀泄除油箱压力后再利用气泵进行诊断，则很会在泄压过程中将过多的燃油蒸汽排入大气中，对环境造成一定污染，无法满足蒸发排放和加油过程排放要求。Due to the existence of the high-pressure resistant fuel tank and the fuel tank isolation valve, when the fuel tank isolation valve is closed, the air pump originally used to test the fuel system leakage cannot directly inflate the fuel tank, but for the purpose of diagnosing fuel tank leakage, it is opened rashly when the fuel tank is still under high pressure If the fuel tank isolation valve releases the fuel tank pressure and then uses the air pump for diagnosis, excessive fuel vapor will be discharged into the atmosphere during the pressure relief process, which will cause certain pollution to the environment and fail to meet the requirements for evaporative emissions and refueling process emissions.
发明内容Contents of the invention
本发明所要解决的技术问题是提供一种耐高压油箱泄漏诊断方法根据耐高压油箱内的实际压力状态选择采用最适合的诊断方法，大大减小了在诊断过程中燃油蒸汽排放，降低了污染，满足了蒸发排放和加油过程排放的要求。The technical problem to be solved by the present invention is to provide a leakage diagnosis method of a high-pressure fuel tank, select and adopt the most suitable diagnostic method according to the actual pressure state in the high-pressure fuel tank, greatly reduce the emission of fuel vapor during the diagnosis process, and reduce pollution. Meets requirements for evaporative emissions and refueling process emissions.
本发明是这样实现的：一种耐高压油箱泄漏诊断方法，该耐高压油箱内置有油箱压力传感器，设定压力阈值条件，用压力阈值条件对油箱压力传感器的压力实测值进行判定，当用压力阈值条件判定压力实测值过高时，采用封闭诊断方式；当用压力阈值条件判定压力实测值正常时，采用开放诊断方式；The present invention is achieved in the following way: a method for diagnosing leakage of a high-pressure fuel tank. The high-pressure fuel tank has a built-in fuel tank pressure sensor. The pressure threshold condition is set, and the pressure threshold value condition is used to judge the actual pressure value of the fuel tank pressure sensor. When using the pressure When the threshold condition determines that the measured pressure value is too high, the closed diagnosis method is adopted; when the pressure threshold condition is used to determine that the measured pressure value is normal, the open diagnosis method is adopted;
所述开放诊断方式在设定了诊断电流阈值后，包括以下步骤：After the diagnostic current threshold is set, the open diagnosis method includes the following steps:
S1.关闭炭罐控制阀和油箱隔离阀；S1. Close the canister control valve and fuel tank isolation valve;
S2.调节气泵控制阀将气泵接入内部循环；S2. Adjust the air pump control valve to connect the air pump to the internal circulation;
S3.打开气泵进行内部循环充气，直到气泵的电流稳定后记录该电流值作为参考稳定电流，完成后关闭气泵；S3. Turn on the air pump to inflate the internal cycle until the current of the air pump is stable, record the current value as a reference stable current, and turn off the air pump after completion;
S4. 打开油箱隔离阀；S4. Open the fuel tank isolation valve;
S5. 调节气泵控制阀将气泵 接入对耐高压油箱充气状态；S5. Adjust the air pump control valve to connect the air pump to the state of inflating the high-pressure fuel tank;
S6. 打开气泵对耐高压油箱进行充气，直到气泵的电流稳定后记录该电流值作为实测稳定电流，完成后关闭气泵；S6. Turn on the air pump to inflate the high-pressure fuel tank until the current of the air pump is stable, record the current value as the measured stable current, and turn off the air pump after completion;
S7. 将参考稳定电流与实测稳定电流进行比较，如参考稳定电流与实测稳定电流之差大于诊断电流阈值，则判断耐高压油箱存在泄漏；S7. Comparing the reference stable current with the measured stable current, if the difference between the reference stable current and the measured stable current is greater than the diagnostic current threshold, it is judged that there is a leak in the high-voltage resistant fuel tank;
所述封闭诊断方法为，首先设定诊断压力变化阈值，然后使炭罐控制阀和油箱隔离阀保持在关闭状态，通过油箱压力传感器记录油箱压力-时间曲线，当根据油箱压力-时间曲线得到的压力变化超过诊断压力变化阈值时，则判断耐高压油箱存在泄漏。The closed diagnosis method is as follows: firstly set the diagnostic pressure change threshold, then keep the canister control valve and the fuel tank isolation valve in the closed state, record the fuel tank pressure-time curve through the fuel tank pressure sensor, when the fuel tank pressure-time curve is obtained When the pressure change exceeds the diagnostic pressure change threshold, it is judged that there is leakage in the high pressure resistant fuel tank.
所述步骤S3中还包括记录气泵参考电流稳定时间，S6中还包括记录气泵实测电流稳定时间的步骤；设定气泵电流稳定时间系数阈值，当(实测电流稳定时间/参考电流稳定时间)≥气泵电流稳定时间系数阈值时，则判断耐高压油箱存在泄漏。The step S3 also includes recording the air pump reference current stabilization time, and S6 also includes the step of recording the air pump actual measured current stabilization time; setting the air pump current stabilization time coefficient threshold value, when (actually measured current stabilization time/reference current stabilization time)≥air pump When the current stabilization time coefficient threshold value is reached, it is judged that there is leakage in the high pressure resistant fuel tank.
所述诊断压力变化阈值为压力下降速率阈值或压力恢复时间阈值，当油箱压力-时间曲线中的压力下降速率超过压力下降速率阈值时或油箱压力下降到环境大气压所用的时间小于压力恢复时间阈值时，则判断耐高压油箱存在泄漏。The diagnostic pressure change threshold is the pressure drop rate threshold or the pressure recovery time threshold, when the pressure drop rate in the fuel tank pressure-time curve exceeds the pressure drop rate threshold or the time taken for the fuel tank pressure to drop to ambient atmospheric pressure is less than the pressure recovery time threshold , it is judged that there is a leak in the high-pressure resistant fuel tank.
所述压力阈值条件包括压力阈值和基准比较气压，当(压力实测值-基准比较气压)≥压力阈值时，判定压力实测值过高；当(压力实测值-基准比较气压)＜压力阈值时，判定压力实测值正常。The pressure threshold condition includes a pressure threshold and a reference comparative air pressure. When (measured pressure value-reference comparative air pressure)≥pressure threshold, it is determined that the measured pressure value is too high; when (measured pressure value-reference comparative air pressure)<pressure threshold, It is determined that the measured pressure value is normal.
所述基准比较气压为一个标准大气压或外部环境气压。The reference comparison air pressure is a standard atmospheric pressure or external ambient air pressure.
所述压力阈值条件包括压力阈值系数和基准比较气压，当(压力实测值/基准比较气压)≥压力阈值系数时，判定压力实测值过高；当(压力实测值/基准比较气压)＜压力阈值系数时，判定压力实测值正常。The pressure threshold condition includes a pressure threshold coefficient and a reference comparative air pressure. When (measured pressure value/reference comparative air pressure)≥pressure threshold coefficient, it is determined that the measured pressure value is too high; when (measured pressure value/reference comparative air pressure)<pressure threshold coefficient, it is determined that the measured pressure value is normal.
所述基准比较气压为一个标准大气压或外部环境气压。The reference comparison air pressure is a standard atmospheric pressure or external ambient air pressure.
本发明耐高压油箱泄漏诊断方法根据耐高压油箱内的实际压力状态选择采用最适合的诊断方法，大大减小了在诊断过程中燃油蒸汽排放，降低了污染，满足了蒸发排放和加油过程排放的要求。The leakage diagnosis method of the high-pressure fuel tank of the present invention selects and adopts the most suitable diagnostic method according to the actual pressure state in the high-pressure fuel tank, which greatly reduces the emission of fuel vapor during the diagnosis process, reduces pollution, and satisfies the requirements of evaporative emission and refueling process emission. Require.
附图说明Description of drawings
图1为本发明所采用的泄露诊断系统连接图；Fig. 1 is the connection diagram of the leakage diagnosis system adopted in the present invention;
图2为本发明耐高压油箱泄漏诊断方法的流程框图；Fig. 2 is a block flow diagram of the method for diagnosing leakage of a high-pressure oil tank of the present invention;
图3为本发明中开放诊断中检测参考值时的气路流动示意图；Fig. 3 is a schematic diagram of gas path flow when detecting a reference value in an open diagnosis in the present invention;
图4为本发明中开放诊断中检测实测值时的气路流动示意图；Fig. 4 is a schematic diagram of the air path flow when detecting the measured value in the open diagnosis in the present invention;
图5为本发明中封闭诊断气路流动示意图。Fig. 5 is a flow schematic diagram of the closed diagnostic gas path in the present invention.
图中：1耐高压油箱、2油箱压力传感器、3气泵控制阀、4炭罐控制阀、5油箱隔离阀、6炭罐、7发动机控制器、8气泵、9空滤器、10发动机。In the figure: 1 high pressure resistant fuel tank, 2 fuel tank pressure sensor, 3 air pump control valve, 4 carbon tank control valve, 5 fuel tank isolation valve, 6 carbon tank, 7 engine controller, 8 air pump, 9 air filter, 10 engine.
具体实施方式detailed description
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明表述的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
实施例1Example 1
如图1所示，现有的采用耐高压油箱1的车辆配有的泄露诊断系统布置放置为，在耐高压油箱1内设置油箱压力传感器2，耐高压油箱1与发动机之间通过管路串联有炭罐6，所述耐高压油箱1与炭罐6之间的设置有油箱隔离阀5，所述发动机10与炭罐6之间的设置有炭罐控制阀4，所述气泵8通过气泵控制阀3并联在炭罐6上，气泵8的进气口上还并联有空滤器9以提供新鲜空气，为了满足诊断中对气泵8接入方式的控制的需求，所述气泵控制阀3通常采用两位四通电磁阀；以上各个动作单元包括油箱压力传感器2、气泵控制阀3、炭罐控制阀4、油箱隔离阀5和气泵8都由车辆自带的发动机控制器7进行控制；As shown in Figure 1, the existing leakage diagnosis system for a vehicle using a high-pressure fuel tank 1 is arranged as follows: a fuel tank pressure sensor 2 is installed in the high-pressure fuel tank 1, and the high-pressure fuel tank 1 and the engine are connected in series through a pipeline. There is a canister 6, a fuel tank isolation valve 5 is provided between the high-pressure resistant fuel tank 1 and the canister 6, a canister control valve 4 is provided between the engine 10 and the canister 6, and the air pump 8 passes through the air pump The control valve 3 is connected in parallel with the canister 6, and the air inlet of the air pump 8 is also connected in parallel with an air filter 9 to provide fresh air. Two-position four-way solenoid valve; the above action units including fuel tank pressure sensor 2, air pump control valve 3, canister control valve 4, fuel tank isolation valve 5 and air pump 8 are all controlled by the engine controller 7 that comes with the vehicle;
如图2，一种耐高压油箱泄漏诊断方法，该耐高压油箱1内置有油箱压力传感器2，设定压力阈值条件，用压力阈值条件对油箱压力传感器2的压力实测值进行判定，当用压力阈值条件判定压力实测值过高时，采用封闭诊断方式；当用压力阈值条件判定压力实测值正常时，采用开放诊断方式；As shown in Figure 2, a leakage diagnosis method of a high-pressure resistant fuel tank, the high-pressure resistant fuel tank 1 is built with a fuel tank pressure sensor 2, the pressure threshold condition is set, and the pressure threshold value condition is used to judge the actual pressure value of the fuel tank pressure sensor 2. When using the pressure When the threshold condition determines that the measured pressure value is too high, the closed diagnosis method is adopted; when the pressure threshold condition is used to determine that the measured pressure value is normal, the open diagnosis method is adopted;
所述开放诊断方式在设定了诊断电流阈值后，包括以下步骤：After the diagnostic current threshold is set, the open diagnosis method includes the following steps:
S1.关闭炭罐控制阀4和油箱隔离阀5；S1. Close the canister control valve 4 and the fuel tank isolation valve 5;
S2.调节气泵控制阀3将气泵8接入内部循环；S2. Adjust the air pump control valve 3 to connect the air pump 8 to the internal circulation;
S3.如图3所示，打开气泵8进行内部循环充气，直到气泵8的电流稳定后记录该电流值作为参考稳定电流，完成后关闭气泵8；S3. As shown in Figure 3, turn on the air pump 8 to inflate the internal circulation until the current of the air pump 8 stabilizes and record the current value as a reference stable current, and close the air pump 8 after completion;
S4. 打开油箱隔离阀5；S4. Open the fuel tank isolation valve 5;
S5. 如图4所示，调节气泵控制阀3将气泵8 接入对耐高压油箱1充气状态，确保气流能够经由气泵8->碳罐6流入耐高压油箱1；S5. As shown in Figure 4, adjust the air pump control valve 3 to connect the air pump 8 to the state of inflating the high-pressure fuel tank 1, so as to ensure that the air flow can flow into the high-pressure fuel tank 1 via the air pump 8->carbon tank 6;
S6. 打开气泵8对耐高压油箱1进行充气，直到气泵8的电流稳定后记录该电流值作为实测稳定电流，完成后关闭气泵8；S6. Turn on the air pump 8 to inflate the high pressure fuel tank 1 until the current of the air pump 8 is stable and record the current value as the measured stable current, and then close the air pump 8 after completion;
S7. 将参考稳定电流与实测稳定电流进行比较，如参考稳定电流与实测稳定电流之差大于诊断电流阈值，则判断耐高压油箱1存在泄漏；S7. Comparing the reference stable current with the measured stable current, if the difference between the reference stable current and the measured stable current is greater than the diagnostic current threshold, it is judged that there is leakage in the high-voltage resistant fuel tank 1;
所述诊断电流阈值为经验参数，根据实际需要的泄露诊断灵敏度和各个设备的精密度凭经验设定取得；The diagnostic current threshold is an empirical parameter, which is set empirically according to the actual required leakage diagnostic sensitivity and the precision of each device;
如图5所示，所述封闭诊断方法为，首先设定诊断压力变化阈值，然后使炭罐控制阀4和油箱隔离阀5保持在关闭状态，通过油箱压力传感器2记录油箱压力-时间曲线，当根据油箱压力-时间曲线得到的压力变化超过诊断压力变化阈值时，则判断耐高压油箱1存在泄漏；所述诊断压力变化阈值为经验参数，根据环境温度、车型、油箱形状、油箱大小设定取得。As shown in FIG. 5 , the closed diagnosis method is as follows: firstly set the diagnostic pressure change threshold, then keep the canister control valve 4 and the fuel tank isolation valve 5 in a closed state, record the fuel tank pressure-time curve through the fuel tank pressure sensor 2, When the pressure change obtained according to the fuel tank pressure-time curve exceeds the diagnostic pressure change threshold, it is judged that there is leakage in the high-pressure resistant fuel tank 1; the diagnostic pressure change threshold is an empirical parameter, which is set according to the ambient temperature, vehicle type, fuel tank shape, and fuel tank size. obtain.
在本发明中，开放诊断方式下除了采用气泵的稳定电流作为判断标准外，还可以采用气泵从打开到电流稳定所需要的时间进行判定，花费时间越长，说明耐高压油箱1相对于原有气流回路的体积越大；此时，所述步骤S3中还包括记录气泵8的参考电流稳定时间，S6中还包括记录气泵的实测电流稳定时间的步骤；设定气泵电流稳定时间系数阈值，当(实测电流稳定时间/参考电流稳定时间)≥气泵电流稳定时间系数阈值时，则判断耐高压油箱1存在泄漏；所述气泵电流稳定时间系数阈值根据该车型的管路系统、油箱形状和油箱大小凭经验进行设置，为经验参数；所述实测电流稳定时间、参考电流稳定时间为气泵打开后到电流稳定时所需要的时间。In the present invention, in the open diagnosis mode, in addition to using the stable current of the air pump as the judgment standard, the time required for the air pump to stabilize the current can also be used for judgment. The larger the volume of the airflow circuit; at this time, the step S3 also includes the reference current stabilization time of the recording air pump 8, and the step of recording the actual measured current stabilization time of the air pump in S6; the air pump current stabilization time coefficient threshold is set, when When (actually measured current stabilization time/reference current stabilization time) ≥ air pump current stabilization time coefficient threshold, it is judged that there is leakage in the high-voltage resistant fuel tank 1; the air pump current stabilization time coefficient threshold is based on the pipeline system, fuel tank shape and fuel tank size of the vehicle It is set based on experience and is an empirical parameter; the measured current stabilization time and the reference current stabilization time are the time required for the current to stabilize after the air pump is turned on.
在本实施例中，所述诊断压力变化阈值的判定有两种方式：In this embodiment, there are two ways to determine the diagnostic pressure change threshold:
一、通过压力下降速率阈值进行判定；压力下降过快说明耐高压油箱1存在泄露。因此，当油箱压力-时间曲线中的压力下降速率超过压力下降速率阈值时，则判断耐高压油箱1存在泄漏；1. Judging by the pressure drop rate threshold; if the pressure drops too fast, it means that there is a leak in the high pressure resistant fuel tank 1 . Therefore, when the pressure drop rate in the tank pressure-time curve exceeds the pressure drop rate threshold, it is judged that there is a leak in the high pressure resistant fuel tank 1;
二、通过压力恢复时间阈值进行判定；在耐高压油箱1和管路系统本身固定时，根据内外压差可以通过实验得到一个正常的压力恢复时间；因此，当油箱压力下降到环境大气压所用的时间小于压力恢复时间阈值时，则判断耐高压油箱1存在泄漏。2. Judging by the pressure recovery time threshold; when the high-pressure resistant fuel tank 1 and the pipeline system itself are fixed, a normal pressure recovery time can be obtained through experiments according to the internal and external pressure difference; therefore, the time it takes for the tank pressure to drop to ambient atmospheric pressure When it is less than the pressure recovery time threshold, it is judged that there is leakage in the high pressure resistant fuel tank 1 .
在本发明中，根据车型自身设备的状况可以采用两种不同的基准比较气压用于比较判断耐高压油箱1内的压力是否属于压力值过高，并根据精确性的要求选择采用差值比较或采用比例比较；In the present invention, two different benchmark comparison air pressures can be used to compare and judge whether the pressure in the high-pressure fuel tank 1 is too high according to the condition of the vehicle's own equipment, and choose to use difference comparison or comparison according to the accuracy requirements. using proportional comparisons;
差值比较方式：所述压力阈值条件包括压力阈值和基准比较气压，当(压力实测值-基准比较气压)≥压力阈值时，判定压力实测值过高；当(压力实测值-基准比较气压)＜压力阈值时，判定压力实测值正常。Difference comparison mode: the pressure threshold condition includes a pressure threshold and a reference comparative air pressure, when (measured pressure value-reference comparative air pressure) ≥ pressure threshold, it is determined that the measured pressure value is too high; when (measured pressure value-reference comparative air pressure) <Pressure threshold value, it is judged that the measured pressure value is normal.
比例比较方式：所述压力阈值条件包括压力阈值系数和基准比较气压，当(压力实测值/基准比较气压)≥压力阈值系数时，判定压力实测值过高；当(压力实测值/基准比较气压)＜压力阈值系数时，判定压力实测值正常。Proportional comparison mode: the pressure threshold condition includes a pressure threshold coefficient and a reference comparative air pressure. When (measured pressure value/reference comparative air pressure)≥pressure threshold coefficient, it is determined that the measured pressure value is too high; when (measured pressure value/reference comparative air pressure )<pressure threshold coefficient, it is judged that the measured pressure value is normal.
当该车辆内没有设置环境气压传感器或环境气压传感器无法正常工作时，选用一个标准大气压作为基准比较气压；当该车辆内设置有环境气压传感器且能正常工作时，所述基准比较气压为外部环境气压。When the ambient air pressure sensor is not set in the vehicle or the ambient air pressure sensor cannot work normally, a standard atmospheric pressure is selected as the reference comparison air pressure; air pressure.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611223301.6ACN106500933B (en) | 2016-12-27 | 2016-12-27 | Diagnosis method of high pressure fuel tank leakage |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611223301.6ACN106500933B (en) | 2016-12-27 | 2016-12-27 | Diagnosis method of high pressure fuel tank leakage |
| Publication Number | Publication Date |
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| CN106500933Atrue CN106500933A (en) | 2017-03-15 |
| CN106500933B CN106500933B (en) | 2019-06-04 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611223301.6AExpired - Fee RelatedCN106500933B (en) | 2016-12-27 | 2016-12-27 | Diagnosis method of high pressure fuel tank leakage |
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| CN (1) | CN106500933B (en) |
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