Control device of continuously variable speed change gear

Abstract

Abstract PURPOSE:To satisfy both response and maneuverability, and make it smooth to change speed in case of a kick down in the acceleration, by setting a desired speed change rate, and controlling the speed change rate directly by using a double-position control valve, using the set speed change rate as a control object. CONSTITUTION:Signals from sensors 41, 42, and 44 are read, the real speed change ratio (i), the object speed change ratio (is), and then, di/dt are determined in computers and detectors in a control unit 40, and the duty ratio D is found from the value of di/dt and the real speed change ratio (i). Depending on the amount of the said D value and the amount of the conversion, a speed change control valve is activated through a solenoid valve 28, the input and the output of the control oil and the rate of the flow conversion from the secondary cylinder to the primary cylinder are controlled, and the gear shift and the speed change rate are converted. Moreover, in case of a kick down in the full acceleration, the speed change rate is corrected only a little, and so the speed change can be carried out smoothly avoiding a speed change shock.

Inventors

• 👤 Hiroshi Tanaka
• 👤 浩 田中
• 👤 Yoshihiko Morimoto
• 👤 森本　嘉彦

Bibliographic Details