ENGINE BRAKE OPTIMUM CAR SPEED DEVICE AND DETERMINING METHOD WHEN DOWNHILL DRIVING OF AUTOMATIC TRANSMISSION CAR

摘要

PURPOSE: When a car drives downhill, driving convenience is improved, and braking number is reduced by reading driver's braking intention and normal speed intention. CONSTITUTION: A brake switch(1) senses whether a brake pedal is pressed. An idle switch(2) senses whether it is idle state. A car speed sensor(3) senses car speed. A road inclination determining sensor(4) determines a road inclination. A transmission control unit(5) receives output of the brake switch(1), the idle switch(2), the car speed sensor(3) and the road inclination determining sensor(4). Then the transmission control unit(5) compares and calculates driver's braking speed and current car speed, and outputs control signal to control engine brake to maintain car speed at a braking speed.