Patent ID: 9562489
Date: 2017-02-07
CPC Classifications: F02D,F02M,Y02T

Claim:
1. A control system for an internal combustion engine using compressed natural gas, comprising: an electronic controller, comprising at least one processor, configured to: perform air-fuel ratio feedback control for determining a fuel injection quantity by using a first correction value, and a second correction value and controlling an amount of fuel injected from a fuel injector of the internal combustion engine based on the determined fuel injection quantity, the first correction value being a correction term determined in relation to a difference between an air-fuel ratio of an air-fuel mixture burned in the internal combustion engine and a target air-fuel ratio, and the second correction value being a correction term for a difference in an inert gas concentration in compressed natural gas, correct said second correction value based on said first correction value when the absolute value of said first correction value is equal to or larger than a threshold value, and perform a learning control of said first correction value after said second correction value is changed.