Method of forcibly regenerating gasoline particulate filter

Patent metadata

Field	Value
Publication number	US-9957865-B2
Application number	US-201615282140-A
Country	US
Kind code	B2
Filing date	Sep 30, 2016
Priority date	Dec 7, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A method of forcibly regenerating a gasoline particulate filter (GPF) includes a first operation of starting an engine, a second operation of determining whether a coolant temperature in the on-state of the engine is equal to or lower than a predetermined temperature, a third operation of determining whether an idle state of the engine is maintained for a predetermined time or longer when the coolant temperature is equal to or lower than the predetermined temperature, and a fourth operation of switching a fuel injection to an air-fuel (A/F) lean injection and forcibly regenerating the GPF by performing the A/F lean injection when the idle state of the engine is maintained for the predetermined time or longer.

First claim

What is claimed is:

1. A method of forcibly regenerating a gasoline particulate filter (GPF), comprising:
a first operation of starting an engine;
a second operation of determining whether a coolant temperature in the on-state of the engine is equal to or lower than a predetermined temperature;
a third operation of determining whether an idle state of the engine is maintained for a predetermined time or longer when the coolant temperature is equal to or lower than the predetermined temperature; and
a fourth operation of switching a fuel injection to an air-fuel (A/F) lean injection and forcibly regenerating the GPF by performing the A/F lean injection when the idle state of the engine is maintained for the predetermined time or longer.

2. The method of claim 1 , wherein an operation of determining whether a mileage of a vehicle is equal to or larger than a predetermined mileage is performed during the second operation, and when the condition in which the mileage of the vehicle is equal to or larger than the predetermined mileage is satisfied, and/or when a condition in which the coolant temperature is equal to or lower than the predetermined temperature is satisfied, the third operation is performed.

3. The method of claim 1 , wherein between the second operation and the third operation, a 2-1 operation of performing an A/F rich fuel injection is further performed when the coolant temperature is equal to or lower than the predetermined temperature, and then the third operation of determining whether the idle state of the engine is maintained for the predetermined time or longer during the A/F rich injection is performed.

4. The method of claim 1 , wherein in the third operation, the predetermined time for determining the maintenance time of the idle state is 20 seconds to 30 seconds.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ma Sang Jin

Classifications

• F01N2430/06

  by varying fuel-air ratio, e.g. by enriching fuel-air mixture · CPC title

• F01N2900/0422

  measuring the elapsed time · CPC title

• F02D2200/0812

  Particle filter loading · CPC title

• F02D41/064

  at cold start (F02D41/067 takes precedence) · CPC title

• F02D41/1475

  Regulating the air fuel ratio at a value other than stoichiometry · CPC title