Reduction gear ratio control method of automatic stepless speed change gear for car

Abstract

Abstract PURPOSE:To smoothly restart a car even if the car is suddenly stopped during low-speed running by starting down shift of a reduction gear ratio control mechanism in an oil pressure control circuit when a throttle opening is 0. CONSTITUTION:When a throttle opening theta is 0, down shift is immediately started and a car velocity is detected. Corresponding to the car velocity, the down shift amount of a V-belt stepless speed change gear is increased or decreased. As the lower the car velocity is, the shorter is the time required for stopping a car after stepping on a brake, the lower the car velocity is, the more the speed change gear is shifted to the down side. In that case, when the brake is stepped, at a lower car velocity, down shift can be completed at smaller shift width, in a short time. If an accelerating pedal is released during high speed running, gripping of an engine brake is lessened so as to improve safety and driving feeling.

Inventors

• 👤 Satoshi Yamada
• 👤 聡 山田
• 👤 Hiroyuki Kachi
• 👤 加地　弘之
• 👤 Shiro Sakakibara
• 👤 史郎 榊原
• 👤 Shoji Yokoyama
• 👤 昭二 横山

Bibliographic Details