Automatic transmission

Abstract

Abstract PURPOSE:To shift a gear down and effect braking automatically without special operation by a driver when traveling a downward slope by determining the gear position of a transmission from the loading condition of an internal combustion engine, a car speed, and a braking condition and operating said transmission. CONSTITUTION:A throttle valve opening value 13, a car speed value 17, an acceleration value 18, and a braking condition value are inputted in a speed change timing processing part 11. Based on these various inputted values, the gear position of a transmission 2 is calculated and compared with the present gear position and, when there is a difference, a speed changing command 15 for changing speed to the calculated gear position, is outputted. And, a speed change signal 14 is outputted by a speed change controlling part 7 based on the speed changing command 15. and speed change is carried out by the transmission 2. By this construction, when a driver steps on a brake pedal while traveling a downward slope without stepping on an accelerator pedal, the transmission is shifted down applying an engine brake without conducting any particular operation. Thereby, the durability of braking device and safety of driving can be improved.

Inventors

• 👤 Taro Matsui
• 👤 松井　太郎

Bibliographic Details