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AssigneesToyota Jidosha Kabushiki Kaisha, Nippon Soken, Inc.
InventorsYuuichi Kato, Hiroki Ichinose, Nao Murase, Rie Osaki
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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 39 capable of detecting the ratio of the heavy fuel and the light fuel, and an air-fuel ratio detector 41 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. The heavy fuel/light fuel ratio detector is diagnosed if it is in an 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. The heavy fuel/light fuel ratio detector can be correctly diagnosed if it is in an abnormal condition even when an alcohol-mixed fuel is used.
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.
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, wherein the ignition timing is controlled so that the engine rotational speed reaches a target rotational speed, and wherein an estimated ignition timing at which the ignition timing is estimated to arrive is calculated based on the heavy fuel/light fuel ratio detector, and the heavy fuel/light fuel ratio detector is diagnosed if it is in abnormal condition, based on a difference between the estimated ignition timing and the ideal ignition timing while the engine temperature is in a particular temperature region.
Dependencies are inferred from the claim text.