Speed change controller for continuously variable transmission

Abstract

Abstract PURPOSE:To aim at improvement in traveling performance and the economy of fuel consumption by determining rotational speed rising-up amount by the effect of compensation on the basis of two factors such as a real speed change ratio and an engine load at the time of decrease in engine power caused by the operation of an air-conditioner or the like so as to perform speed change control by the use of a belt type CVT. CONSTITUTION:The crank shaft 10 of an engine 1 is indirectly coupled to a differential 7 and a driving shaft 8 through an electromagnetic clutch 2, a forward/backward switching device 3, a belt type CVT 4 and reduction gears 5, 6. And then, speed change control is performed on the basis of the various initial values of an engine rotational speed sensor 19, a shift position sensor 26 and the like. At the time of the operation by means of an air- conditioner operating condition detecting sensor 23, a target value compensator retrieves a rotation compensating amount so that a duty ratio may be judged to be large resulting in its down-shift. And thereat, on the basis of a predetermined map, a coefficient corresponding to a real speed change ratio and an engine load (a throttle opening degree) is selected so that a target value may be compensated to set the minimum rotational speed rising-up amount required for operating an air-conditioner, thereby aiming at improvement in traveling performance and the economy of fuel consumption.

Inventors

• 👤 Yoshihiko Morimoto

Bibliographic Details