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A control method and device for a dpf active regenerative fuel injection system
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A technology of active regeneration and fuel injection system, applied in the direction of exhaust device, muffler device, electronic control of exhaust gas treatment device, etc., can solve problems such as safety hazards, fuel injection into the exhaust pipe, etc., to reduce casualties and property. effect of risk of loss
Active Publication Date: 2021-10-08
DONGFENG COMML VEHICLE CO LTD
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[0004] Since the function of the DPF active regenerative fuel injection system is to control the amount of fuel injected into the exhaust pipe when the DPF is actively regenerated, when the regenerative fuel injection system leaks or the control fails, a large amount of fuel will be injected into the exhaust pipe. There is a great security risk
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Embodiment 1
[0065] see Figure 1~3 As shown, the embodiment of the present invention provides a DPF active regeneration fuel injection system control method, the method includes the following steps:
[0066] S1. When the engine is not in the active regeneration state of the DPF, detect the working status of the fuel cut-off valve and the fuel metering valve;
[0067] S2. Detect the magnitude of the regeneration oil supply pressure, and compare it with the preset first pressure threshold and the second pressure threshold to obtain a pressure comparison result;
[0068] S3. According to the working state of the fuel shut-off valve and the fuel metering valve, the pressure comparison result and the temperature difference between the DPF inlet temperature and the DOC inlet temperature, the out-of-control state is judged, and the state judgment result is obtained;
[0069] S4. Regulate the engine according to the state determination result.
[0070] In the embodiment of the present applicati...
Embodiment 2
[0133] see Figure 4 As shown, the embodiment of the present invention provides a DPF active regenerative fuel injection system control device, which implements the DPF active regenerative fuel injection system control method in Embodiment 1, and the device includes:
[0134] Working state detection module 1, which is used to detect the working state of the fuel cut-off valve and the fuel metering valve when the engine is not in the active regeneration state of the DPF;
[0135] A regenerative oil supplypressure detection module 2, which is used to detect the regenerative oil supply pressure, and compare it with the preset first pressure threshold and second pressure threshold to obtain a pressure comparison result;
[0136] A temperature difference detection module 3, which is used to detect and obtain the temperature difference between the DPF inlet temperature and the DOC inlet temperature;
[0137] The out-of-control state monitoring module 4 is used to judge the out-of-...
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Abstract
The application relates to a control method and device for a DPF active regeneration fuel injectionsystem, and relates to the field of automobile technology. Regenerate the fuel supply pressure and compare it with the preset first pressure threshold and second pressure threshold to obtain the pressure comparison result; according to the working status of the fuel cut-off valve and fuel metering valve, the pressure comparison result and the DPF inlet temperature The temperature difference value with the DOC inlet temperature is used to judge the out-of-control state, and the state judgment result is obtained; the engine is regulated according to the state judgment result. This application judges the out-of-control state of the DPF active regenerative fuel injectionsystem according to the working status of the fuel shut-off valve and the fuel metering valve, the pressure comparison results, and the temperature difference, and takes corresponding protection measures to provide safety guarantee for vehicle driving.
Description
technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method and device for a DPF active regeneration fuel injectionsystem. Background technique [0002] DPF (Diesel Particulate Filter, Diesel Particulate Filter) technology is considered to be the most effective means to deal with diesel engine particulate matter emissions. The honeycombceramic carrier structure of DPF can effectively filter and capture particulate matter in diesel engineexhaust gas. In the process of filtering and trapping, as the particles continue to accumulate and accumulate in the DPF, the exhaust back pressure of the diesel engine will increase, which will lead to the deterioration of the performance of the diesel engine. The particles in the DPF must be removed regularly to restore the DPF to its original state and realize the DPF. regeneration. [0003] For medium and heavy-duty diesel engines, in order to realize the active regeneration of...
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