Patent ID: 6428446
Filing Date: 2002-08-06
Classification: F16H,Y10T

Abstract:
A control apparatus for a synchromesh automatic transmission system of a motor vehicle, comprising:a shift/select actuator for driving a synchromesh multi-stage speed change gear unit; a brake switch serving as a sensor for detecting a state where a brake pedal is depressed; an accelerator pedal position sensor for detecting a depression stroke of an accelerator pedal as an accelerator pedal depression stroke; an output rotation speed sensor for detecting a rotation speed of an output shaft of said multi-stage speed change gear unit as a vehicle speed; and speed stage control means for making decision as to speed change on the basis of detection signals outputted from said various sensors and controlling said shift/select actuator in dependence on the result of said decision, wherein a plurality of speed stages of said multi-stage speed change gear unit are automatically changed over from one to another, said speed stage control means comprising: acceleration/deceleration arithmetic means for determining arithmetically acceleration and deceleration of said motor vehicle on the basis of said vehicle speed; and deceleration discriminating means for comparing said deceleration with a predetermined deceleration value, wherein when it is decided by said speed-change control means that said brake switch is in a closed state and that said deceleration is not greater than said predetermined deceleration value, said multi-stage speed change gear unit is shifted to a neutral position and thereafter said speed-change control means establishes a speed-change decision suspend state.