초록 ▼

A constant speed travel control system uses a time period Q which is set such that, if a motor of the actuator is not locked but normally rotated, actuator opening becomes almost certainly fully closed within that time period with the result that a first limit switch is made open. If the motor is no

A constant speed travel control system uses a time period Q which is set such that, if a motor of the actuator is not locked but normally rotated, actuator opening becomes almost certainly fully closed within that time period with the result that a first limit switch is made open. If the motor is normal, the processing operation proceeds to a normal constant speed travel control by which an electric current to the motor ceases and “motor open”condition is detected. When no “motor open”state is detected, even after the elapse of the time period Q, under the condition that the vehicle speed is higher than a reference speed, a determination that the motor is in the locked condition is made and the operation proceeds to a speed control cancellation process.

대표청구항 ▼

An abnormality detecting system for a control mechanism which performs a constant speed travel control, said system comprising: vehicle speed detecting means for detecting a speed of a vehicle; control means having a driving force controlling mechanism for controlling a driving force of an engine of

An abnormality detecting system for a control mechanism which performs a constant speed travel control, said system comprising: vehicle speed detecting means for detecting a speed of a vehicle; control means having a driving force controlling mechanism for controlling a driving force of an engine of the vehicle, and a motor for driving the driving force controlling mechanism; constant speed travel controlling means for, on the basis of a deviation between the speed of the vehicle detected by the vehicle speed detecting means and a target speed, controlling the motor so as to reduce the deviation of the detected speed from the target speed and thereby controlling the driving force of the engine by way of the driving force controlling mechanism; electric current detecting means for detecting an electric current supplied to the motor; electric current cutting means for cutting an electric current input to the motor when the driving force controlling mechanism has been controlled to a minimum driving-force state; excess speed state determining means for determining whether or not the speed of the vehicle detected by the vehicle speed detecting means is higher than a reference speed which is higher than the target speed; driving force minimization controlling means for, when it is being determined by the excess speed state determining means that the detected speed of the vehicle is higher than the reference speed, rotating the motor and thereby controlling the driving force controlling mechanism to the minimum driving-force state; and abnormality determining means for determining that the control mechanism is abnormal when the electric current to the motor is being detected by the current detecting means for more than a time period during which it is being continuously determined by the excess speed state determining means that the speed of the vehicle is higher than the reference speed.