Regeneration control method and device for gasoline particulate filter (GPF)

Abstract

The embodiment of the invention discloses a regeneration control method and device for a gasoline particulate filter (GPF). The method comprises the following steps: acquiring temperature data and pressure data, wherein the temperature data comprises the temperature of a front opening of a three-way catalyst, the temperature of a rear opening of the three-way catalyst and the temperature of a rear opening of the particulate filter, and the pressure data comprises the pressure of the front opening of the particulate filter and the pressure of the rear opening of the particulate filter; according to the temperature data and the pressure data, calculating carbon loading capacity; and when the particulate filter is in a passive regeneration state, if the carbon loading capacity is smaller than the carbon loading capacity required by effective filtration of the particulate filter, adjusting the air-fuel ratio so as to stop passive regeneration. According to the technical scheme, under the condition that related hardware of an existing engine is not changed, the air-fuel ratio is adjusted, then the oxygen content of tail gas is reduced, the temperature value needed by regeneration is increased, and passive regeneration of the particulate filter is stopped under the current working condition.

Description

technical field [0001] The invention relates to the field of engine tail gas treatment, in particular to a method and device for controlling the regeneration of a gasoline engine particle filter. Background technique [0002] In our country, as smog gradually becomes the normal state of the weather, it has a serious impact on people's health and traffic. Smog mainly comes from fine particles suspended in the air, and vehicle exhaust is one of the main sources of urban particulate emissions. In order to improve air quality, in 2016, the sixth phase of China's light-duty vehicle emission standards was officially released. The National VI standard puts forward strict requirements on the emission of particle mass (PM) and particle number (PN) of gasoline engines. Not only the limit of PM is reduced to 3mg / km, but also the PN shall not be higher than 6×10 11 piece / km. [0003] With the full implementation of China VI emission regulations, it is difficult for direct injection g...

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Problems solved by technology

[0005] However, since the particle size of the particle is at the nanometer level and the filter pore size of the carrier of the particle filter is at the micron level, the difference between the two is too large. overlay)

In the case where the thickness of the carbon deposit needs to be reasonably controlled, since the passive regeneration of the GPF can exist in almost all operating conditions of the gasoline engine, there will be cases where the PN control fails to meet the standard due to excessive regeneration due to excessive exhaust temperature

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