Automobile exhaust emission control method, control system and vehicle

Abstract

The invention discloses an automobile exhaust emission control method, a control system and a vehicle. The control method comprises the following steps of dividing a preset altitude range into a plurality of altitude intervals, and when the current DPF actual temperature does not meet a regeneration requirement, determining target oil injection timing corresponding to the current environment altitude according to the reference lower limit oil injection timing and the reference upper limit oil injection timing of the altitude interval corresponding to the current environment altitude where an engine is located, and controlling an oil injection timing system to work according to the target oil injection timing. According to the technical scheme, closed-loop control over oil injection timingis applied, it is guaranteed that the temperature of a DPF carrier is within a certain range, it is guaranteed that the DPF can be regenerated in different use environments, and a vehicle can meet theemission requirement.

Description

technical field [0001] The invention relates to the technical field of post-processing integration, and more specifically relates to a control method, a control system and a vehicle for exhaust emission of automobiles. Background technique [0002] During the working process of the DPF, when the soot particles collected in the DPF reach a certain limit, high-temperature regeneration is required. If it is not regenerated, the back pressure of the post-treatment will increase, resulting in an increase in the exhaust back pressure of the engine, thereby damaging the engine. In the process of DPF regeneration, the regeneration temperature of DPF needs to be strictly controlled. If the temperature is too high (higher than 580°C), the local temperature of the DPF carrier will be too high, resulting in DPF damage. If the DPF regeneration temperature is too low (lower than 520°C) , the DPF regeneration ability is reduced, and the soot particles in the DPF cannot be emptied within th...

AI Technical Summary

Problems solved by technology

However, due to the inconsistency between the ambient temperature and the altitude of the engine, the exhaust temperature of the engine and the temperature required for DPF regeneration are relatively large, and the difference is as high as more than 100°C. Therefore, the normal temperature fuel injection timing cannot cover all engine operations. environment, which leads to difficult regeneration conditions of DPF, and further causes vehicle exhaust to fail to meet emission standards

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