초록 ▼

A control apparatus of an internal combustion engine includes an electronic control unit which determines whether a throttle valve opening sensor is normal or faulty in accordance with an output from the sensor. If the throttle valve opening sensor operates normally, a target air-fuel ratio is set i

A control apparatus of an internal combustion engine includes an electronic control unit which determines whether a throttle valve opening sensor is normal or faulty in accordance with an output from the sensor. If the throttle valve opening sensor operates normally, a target air-fuel ratio is set in accordance with the output of the sensor. On the other hand, if the throttle valve opening sensor is in trouble, the control unit sets the target air-fuel ratio to a ratio equal to or close to the stoichiometric air-fuel ratio in accordance with the output of an intake air amount sensor, whereby a stable operation of the internal combustion engine is ensured.

대표청구항 ▼

[ What is claimed is:] [1.] A control apparatus for an internal combustion engine having a speed adjusting member for engine speed adjustment and a fuel injection device for injecting fuel in suitable quantity to an engine operating state, comprising:a parameter detecting means for detecting a first

[ What is claimed is:] [1.] A control apparatus for an internal combustion engine having a speed adjusting member for engine speed adjustment and a fuel injection device for injecting fuel in suitable quantity to an engine operating state, comprising:a parameter detecting means for detecting a first parameter indicative of the engine operating state and varying with a change in an operating state of the speed adjusting member and for generating an output indicative of the first parameter thus detected;a first output-related value setting means for setting a target output-related value, affecting engine operation, in accordance with at least the output of said parameter detecting means;a second output-related value setting means for setting the target output-related value in accordance with a second parameter, other than the first parameter, indicative of the engine operating state;a fuel injection control means for controlling the fuel injection device in accordance with the target output-related value set by said first or second output-related value setting means; anda failure detecting means for detecting a failure in said parameter detecting means,wherein said fuel injection control means controls the fuel injection device in accordance with mainly the target output-related value set by said first output-related value setting means when no failure in said parameter detecting means is detected by said failure detecting means; andwherein said fuel injection control means controls the fuel injection device in accordance with the target output-related value set by said second output-related value setting means when a failure in said parameter detecting means is detected by said failure detecting means.