A kind of engine exhaust pipeline fault detection method
A technology for exhaust pipeline and fault detection, which is applied to engine components, combustion engines, engine control, etc., can solve the problems of poor versatility and achieve high versatility
Active Publication Date: 2022-07-19
WEICHAI POWER CO LTD
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Problems solved by technology
[0004] Leakage in the exhaust pipe and removal of the catalytic converter are one of the failures of the engine exhaust pipe. Not all the sensors used to confirm whether the exhaust pipe is leaking and whether the catalytic converter is removed are not all. Both are installed on the engine, poor versatility
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[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the accompanying drawings only show some but not all of the parts related to the present invention.
[0032] When there is air leakage in the engine exhaust line on the vehicle or the catalyst is removed, the opening of the EGR (Exhaust Gas Recycle, exhaust gas recirculation) valve in the engine EGR system will be higher than the opening of the EGR valve when the engine EGR system is operating normally. Therefore, based on the opening deg...
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The invention relates to the field of vehicles, and discloses a fault detection method for an exhaust pipe of an engine. The method for detecting engine exhaust pipeline faults provided by the present invention includes the following steps: obtaining the feedforward opening of the EGR valve, and adjusting the opening of the EGR valve according to the feedforward opening of the EGR valve; obtaining the actual opening of the EGR valve and the EGR valve The difference between the feedforward opening of the valve is compared with the preset difference. When the difference is greater than the preset difference, it is confirmed that there is a fault in the engine exhaust pipe. There is no need to add new sensors, just by optimizing the existing control program on the vehicle, it can effectively detect whether there is a fault in the engine exhaust pipe due to the removal of the catalyst and the leakage of the exhaust pipe, with high versatility .
Description
technical field [0001] The invention relates to the field of vehicles, in particular to a method for detecting a fault in an engine exhaust pipe. Background technique [0002] In the National VI emission regulations, it is clearly stipulated that the exhaust gas of the engine without catalyst treatment is not allowed to be directly discharged into the atmosphere, so the exhaust pipeline upstream of the catalyst must be strictly sealed to avoid air leakage. Usually, a flow sensor is used to detect the flow of the exhaust pipeline or a pressure sensor is used to detect the pressure in the exhaust pipeline to confirm whether the exhaust pipeline is leaking. [0003] In addition, due to the high price of precious metals in the catalytic converter, the catalytic converter is often illegally removed without the user's knowledge, so that the high-temperature exhaust gas emitted by the automobile is directly discharged into the atmosphere without being treated by the catalytic conve...
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IPC IPC(8): F01N11/00F02B77/08F02D41/00F02D21/08
CPCF01N11/00F02B77/08F02D41/0077F02D21/08F01N2550/24F02D2021/083Y02T10/40
Inventor 刘锡庆徐鹏田昭杰赵进超杨兆山
Owner WEICHAI POWER CO LTD