Automatic transmission system for vehicle

Abstract

Abstract PURPOSE: To prevent a creep of a vehicle by making a friction element for stopping an input axis engage when both the working quantity of an accelerator pedal and the speed of a vehicle fall below fixed values. CONSTITUTION: In a hydraulic circuit, provided are a governor valve as a vehicle- speed detecting device, a pedal switch 528 as an accelerator pedal operation detecting device, the 1st solenoid valve 124, a vehicle-stoppage detecting valve 122 and a torque converter lock valve 128. When the 1st speed is achieved and the speed of a vehicle falls below 7W10km/h, the vehicle-stoppage detecting valve 122 is made to conduct the motion to the right, while the line pressure P 1 from an oil route 368 is supplied to a torque converter lock valve 128 to make the same conduct the motion to the left. While the accelerator pedal is held open at this time, the 1st solenoid valve 124 is blocking an opening part 524. The line pressure P 1 of an oil route 504 is supplied to a friction element braking an input axis through the intermediary of oil routes 547 and 544. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Takeo Hiramatsu

Bibliographic Details