| 摘要 |
PURPOSE:To satisfy both response and maneuverability, and obtain the braking effect responding to a decelerating requirement of a driver in the braking operation, by setting an object speed change rate as a control object, and controlling the speed change rate directly by operating a single control valve. CONSTITUTION:Signals from sensors 41, 42, and 44 are read, and the real sped change ratio (i), the object speed change ratio (is), and then, di/dt are determined in computers and detectors in a control unit 40. The duty ratio D is found from the said di/dt and the real speed change ratio (i). Depending on the amount of the said value of D and the amount of the conversion, a speed change 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 the braking operation, the speed change rate is corrected broadly by a speed change rate corrector 55, by putting a pedal switch 53, and a rapid shift down to the lower step can be realized to increase the braking effect. |
