Patent ID: 8160790

Claim:
A vehicle speed control system for a vehicle comprising: a failure detector configured to determine whether or not a failure occurs in the vehicle; a vehicle speed restriction controller configured to control an engine to decrease a vehicle speed of the vehicle when the failure detector detects the failure; a driving state detector configured to detect a driving state of the vehicle; an operation position sensor configured to detect a position of an input member which is operated by a driver; a driving power output controller including a throttle valve which controls an amount of intake-air supplied to the engine, an actuator configured to cause the throttle valve to change an opening degree, and an actuator controller configured to control the actuator based on a signal output from the operation position sensor; and a throttle opening degree sensor configured to detect the actual opening degree of the throttle valve; wherein the vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure; wherein the vehicle speed restriction controller is configured to instruct the actuator controller to cause the throttle valve to decrease the opening degree to a target restriction opening degree if it is determined that the opening degree corresponding to the signal output from the operation position sensor is not smaller than the actual opening degree detected by the throttle opening degree sensor, thereby decreasing the vehicle speed, when the failure detector detects the failure; and wherein the vehicle speed restriction controller is configured not to execute deceleration control and the actuator controller is configured to control the actuator based on the signal output from the operation position sensor, when the throttle opening degree corresponding to the signal output from the operation position sensor is smaller than the opening degree detected by the throttle opening degree sensor.