Patent ID: 6249738
Filing Date: 2001-06-19
Classification: B60K,B60T,B60W,G08G

Abstract:
A vehicular velocity controlling apparatus for an automotive vehicle, comprising:an inter-vehicle distance detector detecting an inter-vehicle distance from the vehicle to another vehicle which is running ahead of the vehicle;a vehicle velocity detector detecting a vehicular velocity of the vehicle;an inter-vehicle distance controller, the inter-vehicle distance controller calculating a target value of the vehicular velocity, the target value of the vehicular velocity being calculated to make the detected value of the inter-vehicle distance equal to a target value of the inter-vehicle distance;a vehicular velocity servo controller, the vehicular velocity servo controller being responsive to the target value of the vehicular velocity from the inter-vehicle distance controller, calculating a target value of a vehicular force to be exerted by the vehicle to vary the vehicular velocity according to the target value of the vehicular velocity, and distributing the target value of the vehicular force exerted by the vehicle into a vehicular driving force for a vehicular drive system and a vehicular braking force for a vehicular brake system;a comparator, the comparator comparing the detected value of the vehicular velocity with a set lower limit value of the vehicular velocity in a vehicular velocity controllable range;a control release command generator, the control release command generator being responsive to a result of a comparison by the comparator indicating that the detected value of the vehicular velocity, which is made equal to the target value of the vehicular velocity according to the result of vehicular force by means of the vehicular servo controller, is lower than the set lower limit value and generating and outputting a release command to release a calculation of the target value of the vehicular velocity by the inter-vehicle distance controller and to release the calculation of the target value of the vehicular force by the vehicular velocity servo controller; anda function generator, the function generator being responsive to the result of the comparison by the comparator and generating and outputting a predetermined function to the vehicular brake system to only continue a control of the vehicular braking force through the vehicular brake system.