摘要:
An air-fuel control system for a lean burn engine which carries out lean burning under specific engine operating conditions causes the engine to burn at an stoichiometric air-fuel ratio regardless of engine operating conditions upon an occurrence of malfunctions of a stratifying device and/or a fuel injection timing control device, so as thereby to enable the engine always to operate in good conditions.
摘要:
An throttle-opening detecting apparatus for an internal combustion engine includes a fully-closed state value learning unit for storing and updating as a fully-closed state learned value a minimum value of an output of a throttle-opening sensor, and a judgment unit for judging the fully closed state of the throttle valve based on comparison of the throttle-opening sensor output and the fully-closed state learned value. The judgment unit includes a first element for judging the throttle valve as being in the fully closed state when the throttle-opening sensor output is less than a first judging value which is obtained by adding a first threshold value to the learned value, and a second element for judging, when the throttle-opening sensor output is greater than the first judging value and less than a second judging value which is obtained by adding a second threshold value to the learned value, the throttle valve as being in the fully closed state after lapse of a predetermined time.
摘要:
An apparatus and a method for determining a failure of a temperature sensor for an automatic transmission of a motor vehicle are provided. A first temperature sensor senses the temperature of a coolant for cooling an engine. A second temperature sensor senses the temperature of a hydraulic oil in the transmission. The output of the second temperature sensor is compared with a first failure determination level and a second failure determination level. It is determined that the second temperature sensor is in a failure when the output of the second temperature sensor is lower than the first failure determination level or higher than the second failure determination level. The output of the first temperature sensor is compared with a first predetermined level and a second predetermined level which is higher than the first predetermined level. The determination of a failure of the second temperature sensor is prohibited when the output of the first temperature sensor is below the first predetermined level or above the second predetermined level.