GPF regeneration hierarchical control method and system for hybrid vehicle model

Abstract

The invention provides a GPF regeneration hierarchical control method for a hybrid vehicle type. The GPF regeneration hierarchical control method comprises the steps that GPF carbon loading capacity and a GPF inlet temperature value of a vehicle are obtained; when the GPF carbon loading capacity is larger than a first preset value and smaller than or equal to a third preset value, the fuel cut-offtime of an engine is controlled when the engine decelerates; when the GPF carbon loading capacity is larger than the third preset value and smaller than or equal to a fourth preset value, a target air-fuel ratio and the ignition efficiency of the engine are adjusted according to the GPF carbon loading capacity and the GPF inlet temperature value, and the deceleration fuel cut-off time of the engine is controlled according to the GPF carbon loading capacity; and when the GPF carbon loading capacity is larger than the fourth preset value, the target air-fuel ratio and the ignition efficiency ofthe engine are adjusted according to the GPF carbon loading capacity and the GPF inlet temperature value. By means of the method, the efficient regeneration effect can be guaranteed, and meanwhile the economical efficiency of the hybrid vehicle type is also considered.

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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