Patent ID: 8046152
Filing Date: 2011-10-25
Classification: F02B,F02D,F02M,F02P,Y02T

Abstract:
1. A device for controlling an internal combustion engine which uses, as the fuel, a heavy fuel, a light fuel, an alcohol fuel and a mixture thereof, comprising a heavy fuel/light fuel ratio detector capable of detecting the ratio of the heavy fuel and the light fuel, and an air-fuel ratio detector for detecting the air-fuel ratio of the exhaust gas, wherein the amount of fuel injection is calculated based on the heavy fuel/light fuel ratio detector so that the air-fuel ratio becomes a target air-fuel ratio, and wherein the heavy fuel/light fuel ratio detector is diagnosed if it is in abnormal condition based on a difference between the target air-fuel ratio and the air-fuel ratio detected by the air-fuel ratio detector while the engine temperature is in a particular temperature region.