DOC failure judging method
A technology for fault determination and carrier, which is applied to the electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, and complex mathematical operations. It can solve problems such as estimation errors, delays, and errors, and reduce conversion efficiency estimation errors. value, the effect of improving the efficiency of calculation accuracy
Inactive Publication Date: 2020-08-25
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology
[0004] 1. Fuel is injected at the DOC inlet, until the diesel is completely combusted to release heat, and finally transferred to the DOC outlet temperature sensor, there is a certain time delay in this process; if the actual heat estimation is performed using the DOC inlet and outlet temperatures measured at the same time, there will be delay, resulting in error
[0005] 2. Under different working conditions, there are differences in the heat released by the gas to the carrier, and this part of the heat will also cause errors in the estimation of the final efficiency
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[0050] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.
[0051] Such as figure 1 As shown, a DOC fault judgment method is suitable for reducing the DOC conversion efficiency estimation error value, including the following steps:
[0052] S100. If figure 2 As shown, when the DOC carrier inlet gas 7 flows to the DOC carrier inlet 2, the total intake air flow of the engine is measured; the temperature of the DOC carrier inlet gas 7 is measured; and the injection pressure of the HC injection unit 4 is measured.
[0053] Such as image 3 As shown, the in...
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The invention relates to a DOC failure judging method which comprises the following steps: measuring the engine air-intake flow rate and the injection pressure at the inlet of a DOC carrier; measuringthe gas temperature at the outlet of the DOC carrier and the gas temperature at the inlet of the DOC carrier; acquiring the exhaust mass flow rate and the post-treatment HC injection rate through calculation; calculating the conversion efficiency of the DOC carrier; and comparing the conversion efficiency with the manually preset converse efficiency threshold, judging whether the DOC fails or notaccording to the comparison result, and outputting the judging result. Through the DOC failure judging method, the actual heat calculation based on the measurement of the temperature at the inlet andthe outlet of the DOC at the same time can be ensured, and the generation of delay errors can be avoided; and the DOC failure judging method is suitable for measuring the DOC under various working conditions, so that the final efficiency calculating accuracy can be improved and the conversion efficiency estimating error value can be reduced.
Description
technical field [0001] The invention relates to the control field of engine tail gas purification treatment, in particular to a DOC fault judgment method. Background technique [0002] With the upgrading of diesel engine emission regulations, the requirements of the engine for the aftertreatment system are becoming more and more stringent. The existing mainstream diesel engine post-treatment system includes DOC, DPF and SCR; the exhaust gas from the engine passes through DOC, DPF and SCR in sequence before being discharged into the atmosphere, so as to reduce emissions. Among them, the functions of DOC are as follows: 1. Further oxidize HC, CO and NO in the exhaust gas, thereby reducing the amount of HC, CO and PM; 2. When DPF is regenerated, fuel is injected in front of DOC, and the combustion of fuel improves DPF inlet temperature ensures smooth regeneration of DPF. When the efficiency of DOC decreases due to poisoning or aging, it will not only be unable to further oxid...
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IPC IPC(8): F01N11/00G06F17/15
CPCF01N11/00F01N11/002G06F17/15Y02T10/40
Inventor 王梅俊张衡蒋学锋周杰敏陈玉俊程欢韩虎李林李芳白桃李郑攀杨晓莹
Owner DONGFENG COMML VEHICLE CO LTD