A hybrid vehicle gpf regeneration hierarchical control method and system

Abstract

The present invention provides a GPF regeneration grading control method for a hybrid vehicle, which includes: obtaining the GPF carbon load of the vehicle and the GPF inlet temperature value; when the GPF carbon load is greater than a first preset value and less than or equal to a third preset value , when the engine decelerates, control the engine oil cut-off time; when the GPF carbon load is greater than the third preset value and less than or equal to the fourth preset value, adjust the target air-fuel ratio and ignition of the engine according to the GPF carbon load and the GPF inlet temperature value efficiency, and control the engine deceleration and fuel cut-off time according to the GPF carbon load; when the GPF carbon load is greater than the fourth preset value, the target air-fuel ratio and ignition efficiency of the engine are adjusted according to the GPF carbon load and the GPF inlet temperature value. The invention can not only ensure the efficient regeneration effect, but also take into account the economy of the hybrid vehicle.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a GPF regeneration classification control method and system for hybrid vehicles. Background technique [0002] GPF (Gasoline Particulate Filter, gasoline engine particulate filter) is used to capture particulate emissions from gasoline engines, thereby reducing particulate matter (PM) and number (PN). When the carbon particles from gasoline engine exhaust are captured by the GPF and accumulate continuously in the GPF, when the accumulation of carbon load exceeds a certain limit, it will lead to adverse effects such as an increase in exhaust back pressure, a decrease in power performance, and an increase in fuel consumption. Therefore, it is necessary to control the GPF Perform regeneration control. [0003] Due to the frequent start and stop of the engine of the hybrid vehicle, the GPF carbon particles increase rapidly; the existing strategy of the hybrid vehicle...

AI Technical Summary

Problems solved by technology

When the carbon particles from gasoline engine exhaust are captured by the GPF and accumulate continuously in the GPF, when the accumulation of carbon load exceeds a certain limit, it will lead to adverse effects such as an increase in exhaust back pressure, a decrease in power performance, and an increase in fuel consumption. Therefore, it is necessary to control the GPF Perform regeneration control

[0003] Due to the frequent start and stop of the engine of the hybrid vehicle, the GPF carbon particles increase rapidly; the existing strategy of the hybrid vehicle lacks the condition that the engine does not stop during deceleration, deceleration and fuel cut-off, and there is no passive regeneration process of deceleration and fuel cut-off in normal driving conditions, reducing GPF regeneration ability, compared with traditional non-hybrid vehicles, can easily lead to frequent GPF alarms or even blockage, which can seriously damage the engine

[0004] In order to introduce fresh air, the existing technical solution needs to modify the engine structure and add a pipe to introduce the fresh air released by the intake valve into the GPF, which will increase the hardware cost and difficulty

In addition, the temperature of the fresh air discharged by the intake valve is relatively low, and it is difficult to introduce the air into the GPF to reach above 500 degrees Celsius, which does not reach the lowest temperature point where charcoal particles participate in combustion, and the regeneration effect is not good

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