JPWO2020208390A5 - - Google Patents

Claims (7)

In a hybrid vehicle in which a motor generator for power generation is generated by an internal combustion engine having an air-fuel ratio sensor provided in an exhaust passage and the driving motor generator is driven by the power generated by this power generation, the air-fuel ratio is leaner than the theoretical air-fuel ratio. It is a control method of an internal combustion engine that is operated in a normal state.
When there is a request to restart the internal combustion engine, the internal combustion engine is motorized by the power generation motor generator, and the state of fresh air passing through the exhaust passage during the motoring is learned by the air-fuel ratio sensor. An internal combustion engine control method that uses the air-fuel ratio learning value learned by the air-fuel ratio sensor as the standard for calculating the air-fuel ratio. The control method for an internal combustion engine according to claim 1, wherein the air-fuel ratio learned value learned by the air-fuel ratio sensor is corrected based on the exhaust pressure of the exhaust gas passing through the exhaust passage. A variable valve timing mechanism provided in the internal combustion engine includes controlling the exhaust pressure of the exhaust flowing through the exhaust passage to the lowest pressure at which the unburned fuel in the exhaust passage can be scavenged. The method for controlling an internal combustion engine according to claim 1. The internal combustion engine according to any one of claims 1 to 3, which comprises setting the post-start air-fuel ratio on the rich side of the target air-fuel ratio by the variation in the air-fuel ratio and operating the internal combustion engine at the post-start air-fuel ratio. How to control the engine. The control method for an internal combustion engine according to claims 1 to 4, wherein the vibration of the internal combustion engine is detected by a vibration sensor provided in the internal combustion engine, and the air-fuel ratio is brought close to the target air-fuel ratio while keeping the vibration at a predetermined level. .. The control method for an internal combustion engine according to claim 1, wherein the motoring is performed until the rotation speed of the internal combustion engine reaches or approaches the rotation speed of the power generation point. In a hybrid vehicle in which a motor generator for power generation is generated by an internal combustion engine and the motor generator for driving is driven by the power generated by the power generated, an air-fuel ratio sensor for detecting the air-fuel ratio of exhaust gas is provided in the exhaust passage of the internal combustion engine. It ’s a control device,
When there is a request to restart the internal combustion engine, the internal combustion engine is motorized by the power generation motor generator, and the state of fresh air passing through the exhaust passage during the motoring is learned by the air-fuel ratio sensor. An internal combustion engine control device that operates an internal combustion engine with a target air-fuel ratio leaner than the theoretical air-fuel ratio, using the air-fuel ratio learned value learned by the air-fuel ratio sensor as the standard for calculating the air-fuel ratio.