| 摘要 |
The invention is concerned with control of a continuously variable vehicle transmission. The transmission in question is to have a variator (10) which is coupled between a rotary transmission input (32) and a rotary transmission output (46), to provide continuous variation in a transmission drive ratio, via a launch device such as a clutch (62) or (68) by means of which the operative connection between the rotary input and the rotary output can be made and broken. The variator in question is constructed and arranged to exert a required torque, defined by an input signal. The launch device is constructed and arranged to provide a required torque capacity. In accordance with the invention, the same control signal is used to control both the variator torque and the torque capacity of the launch device. In such an arrangement, vehicle launch (i.e. moving away from rest) can be controlled in a very straightforward manner by progressively raising the relevant control signal.
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