Control method and system for passive regeneration of hybrid electric vehicle

Abstract

The invention provides a control method and system for passive regeneration of a hybrid electric vehicle. The method comprises the steps that the pressure difference between the front end and the rear end of a vehicle-mounted GPF is obtained, and a vehicle control unit calculates to obtain the carbon load of the vehicle-mounted GPF according to the pressure difference; if the carbon load is smaller than a first limit value, GPF accumulated carbon removal is not carried out, and if the carbon load is larger than a second limit value, active regeneration is carried out, wherein the second limit value is larger than the first limit value; and when the carbon load is smaller than the second limit value and larger than the first limit value, the inlet temperature of the vehicle-mounted GPF and the SOC of a battery are obtained, whether passive regeneration conditions are met or not is judged according to the inlet temperature of the GPF and the SOC of the battery, and if yes, the vehicle-mounted GPF is controlled to conduct passive regeneration. By means of the method, the hybrid power vehicle not prone to entering passive regeneration can also effectively enter a passive regeneration program, so that accumulated carbon particles are efficiently regenerated, and the situation that the hybrid power vehicle frequently enters active regeneration to affect drivability and economical efficiency is avoided.

Description

technical field [0001] The invention relates to the technical field of vehicle emission, in particular to a passive regeneration control method and system for a hybrid vehicle. 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. The regeneration of GPF is divided into two modes: active regeneration and passive regeneration. Among them, passive regeneration has high efficiency and does not affect driving and ec...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a passive regeneration control method and system of a hybrid electric vehicle, which solves the problem that the probability of passive regeneration in existing hybrid electric vehicles is reduced, and enables hybrid electric vehicles that are difficult to enter passive regeneration to effectively enter the passive regeneration program , so as to efficiently regenerate the accumulated carbon particles, avoiding frequent active regeneration and affecting drivability and economy

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