Clutch pressure control apparatus

A clutch pressure control apparatus which comprises:

• (a) a first function generator for generating a clutch pressure control signal in accordance with a first function such that a clutch pressure control signal P.sub.c1 is definitely determined as a function of an engine rotational speed signal and an acclerator pedal stroke signal;
• (b) a controller including a second function generator for providing a second clutch pressure control signal P.sub.c2 in accordance with a second function such that when actual engine speed at an initial clutch engagement phase at which a clutch is entering a half-clutch state exceeds a predetermined engine speed limit, which does not provide shock when the clutch is engaged, said second clutch pressure control signal is first set to a temporary low value corresponding to an engine speed not exceeding the predetermined engine speed limit and then in accordance with said second function is allowed to approach a value determined by the first function according to the actual engine speed signal;
• and
• (c) a start switch for detecting accelerator pedal stroke and transmission shift position and outputting a start signal to start to operate said controller when transmission is shifted to a running position and the accelerator stroke meets a condition for start,
• wherein the second clutch pressure control signal P.sub.c2 increases as the time proceeds starting from said outputting of the start signal;
• said controller receiving control signal P.sub.c1, the accelerator pedal stroke signal, the start signal and the engine rotational speed and selecting the control signal P.sub.c2 when the engine speed signal is higher than the predetermined engine speed limit and P.sub.c1 is higher than P.sub.c2, or selecting the control signal P.sub.c1 when the engine speed signal is not higher than the predetermined engine speed limit or P.sub.c1 is not higher than P.sub.c2 with the control signal P.sub.c1 being maintained until the start signal is outputted again.