Method for controlling internal combustion engine, and device for controlling internal combustion engine

Patent metadata

Field	Value
Publication number	US-12025071-B2
Application number	US-202018267651-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Dec 16, 2020
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

An internal combustion engine ( 1 ) automatically stops when a predetermined idle stop condition is satisfied, and automatically restarts when a predetermined idle stop cancel condition is satisfied. The internal combustion engine ( 1 ) is controlled so that when fresh air does not flow into a GPF ( 18 ) even if fuel injection is stopped during operation of a vehicle, stop of the fuel injection is permitted even when temperature of GPF ( 18 ) is high. That is, the internal combustion engine ( 1 ) is controlled so that the stop of the fuel injection is forbidden when the temperature of the GPF ( 18 ) is higher than a predetermined temperature T 1 and the stop of the fuel injection is allowed when the vehicle stops in a state in which the temperature of the GPF ( 18 ) is higher than the predetermined temperature (T 1 ).

First claim

The invention claimed is:

1. A method for controlling an internal combustion engine mounted on a vehicle that can stop fuel injection and automatically stop the internal combustion engine, the internal combustion engine provided with an exhaust passage and an exhaust particulate filter provided in the exhaust passage, the exhaust particulate filter having a temperature sensor that detects temperature of the exhaust particulate filter and a differential pressure sensor that detects a deposition amount of exhaust particulates deposited on the exhaust particulate filter, the method comprising:
detecting the temperature of the exhaust particulate filter by the temperature sensor;
detecting the deposition amount of the exhaust particulates deposited on the exhaust articulate filter by the differential pressure sensor;
when the temperature of the exhaust particulate filter is higher than a predetermined temperature and also the deposition amount of the exhaust particulates deposited on the exhaust particulate filter is equal to or greater than a predetermined amount, forbidding stop of the fuel injection;
when the temperature of the exhaust particulate filter is higher than the predetermined temperature and also the deposition amount of the exhaust particulates deposited on the exhaust particulate filter is less than the predetermined amount, allowing the stop of the fuel injection; and
when the vehicle stops in a state in which the temperature of the exhaust particulate filter is higher than the predetermined temperature, stopping the fuel injection and allowing automatic stop of the internal combustion engine.

2. The method for controlling the internal combustion engine as claimed in claim 1 , further comprising:
in a case where the temperature of the exhaust particulate filter is equal to or lower than the predetermined temperature by detecting the temperature of the exhaust particulate filter by the temperature sensor and also the deposition amount of the exhaust particulates deposited on the exhaust particulate filter is equal to or greater than the predetermined amount by detecting the deposition amount of the exhaust particulates deposited on the exhaust particulate filter by the differential pressure sensor when the vehicle stops, forbidding the stop of the fuel injection.

3. The method for controlling the internal combustion engine as claimed in claim 1 , further comprising:
judging the vehicle stop using a detection signal of a vehicle speed sensor that detects a vehicle speed and a detection signal of an acceleration sensor that detects an acceleration along a longitudinal direction of the vehicle.

4. The method for controlling the internal combustion engine as claimed in claim 1 , further comprising:
when a predetermined time elapses from the vehicle stop, stopping the fuel injection.

5. A control device of an internal combustion engine comprising:
the internal combustion engine mounted on a vehicle that can stop fuel injection and automatically stop the internal combustion engine;
an exhaust particulate filter provided in an exhaust passage of the internal combustion engine, the exhaust particulate filter having a temperature sensor that detects temperature of the exhaust particulate filter and a differential pressure sensor that detects a deposition amount of exhaust particulates deposited on the exhaust particulate filter; and
a control unit configured to
when the temperature of the exhaust particulate filter is higher than a predetermined temperature by detecting the temperature of the exhaust particulate filter by the temperature sensor and also the deposition amount of the exhaust particulates deposited on the exhaust particulate filter is equal to or greater than a predetermined amount by detecting the deposition amount of the exhaust particulates deposited on the exhaust particulate filter by the differential pressure sensor, forbid stop of the fuel injection,
when the temperature of the exhaust particulate filter is higher than the predetermined temperature and also the deposition amount of the exhaust particulates deposited on the exhaust particulate filter is less than the predetermined amount, allow the stop of the fuel injection, and
when the vehicle stops in a state in which the temperature of the exhaust particulate filter is higher than the predetermined temperature, stop the fuel injection and allow automatic stop of the internal combustion engine.

Assignees

• Nissan Motor

Inventors

• Kamiya Kohei
• Tohta Yuzuru
• Jung Jooyong

Classifications

• F02D2200/1002

  Output torque · CPC title

• F02D2200/501

  Vehicle speed · CPC title

• F02D2200/0812

  Particle filter loading · CPC title

• F02D2200/0802

  Temperature of the exhaust gas treatment apparatus · CPC title

• F02D41/3005

  Details not otherwise provided for · CPC title