Fault diagnosis method and diagnosis device and engine tail gas treatment system
A fault diagnosis and engine technology, which is applied to the diagnosis device of the exhaust treatment device, exhaust treatment, engine components, etc., can solve the problems of affecting the safe operation of the vehicle, misoperation of assembly workers, and wrong measurement of exhaust temperature and exhaust temperature. , to avoid the effect of exhaust gas temperature measurement error
Active Publication Date: 2019-08-09
WEICHAI POWER CO LTD
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Problems solved by technology
However, during the vehicle assembly process, due to incorrect labeling of the wiring harness or misoperation by the assembly worker, the temperature sensor at the front end of the DOC and the temperature sensor at the front end of the DPF will be installed in reverse. The measurement of the exhaust temperature at the front end of the DPF is wrong, which leads to inaccurate calculation of the amount of carbon deposition in the DPF model, which affects the safe operation of the vehicle
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[0039] The above is the core idea of the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention Description, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. 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.
[0040] The embodiment of the present invention provides a fault diagnosis method, such as figure 1 shown, including:
[0041] S101: Determine whether the engine is in a transient state, if it is in a transient state, go to S102;
[...
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The invention provides a fault diagnosis method and diagnosis device and an engine tail gas treatment system. The method comprises the steps that whether an engine is in an instantaneous condition ornot is judged; if the engine is in the instantaneous conditions state, whether the exhaust temperature fluctuation range of a DPF front end is larger than that of a DOC front end or not is judged; ifyes, whether the duration time that the exhaust temperature fluctuation range of the DPF front end is larger than that of the DOC front end is larger than preset time or not is judged; and if the duration time is larger than the preset time, it is judged that the failure that a temperature sensor of the DOC front end and a temperature sensor of the DPF front end are mounted reversely happens, thespeed and torque of a vehicle are limited, a failure alarm is given so as to remind a technician or driver to adjust the positions of the temperature sensor of the DOC front end and the temperature sensor of the DPF front end, and the situation that the exhaust temperature of the DOC front end and the exhaust temperature of the DPF front end are measured wrongly, consequently, calculation of the DPF model carbon deposition quantity is inaccurate, and safe running of the vehicle is influenced is avoided
Description
technical field [0001] The invention relates to the technical field of engines, and more specifically relates to a fault diagnosis method, a diagnosis device and an engine exhaust gas treatment system. Background technique [0002] A diesel engine is an internal combustion engine that combusts a mixture of air and fuel to reciprocally drive a piston slidably provided in a cylinder to generate drive torque. Diesel engines generally have higher efficiency than gasoline engines, but the emission of particulate matter from diesel engines is also dozens of times that of gasoline engines, seriously affecting the atmospheric environment. [0003] At present, because the engine exhaust treatment system can reduce 90% of the particulate matter emissions in the exhaust of automobiles, and the original diesel engine has only minor changes, it has become the most effective equipment for reducing the emission of soot particles from diesel engines. Among them, the engine exhaust treatmen...
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IPC IPC(8): F01N11/00
CPCF01N11/002F01N2250/02F01N2560/06F01N2900/0416F01N2900/0422Y02T10/40
Inventor 王兴元尹东东李静静张宏涛浦路
Owner WEICHAI POWER CO LTD