Control system for vehicular friction-type transmission clutch

An arrangement for regulating a torque transmitted by friction-type gear-shifting means in a change-speed transmission means, wherein a gear shifting is accomplished under a load, the gear shifting means including a multiplate friction clutch means, the arrangement comprising a first sensor means for sensing an input speed of the transmission means and for providing an output signal of a sensed input speed, a second sensor means for sensing an output signal of the transmission means and for providing an output signal of the sensed output speed, characterized in that a third sensor means is arranged at the transmission means for sensing an operating pressure of an operating fluid of the friction clutch means and for providing an output signal of a sensed operating pressure, and in that a control means is provided for receiving, as an input, the output signals of the first, second, and third sensor means and for generating, within a presetable gear shifting time, an output signal for the operating pressure of the friction clutch means which satisfies the following relationship:

• for o<t<T,
• U(t)=a.sub.2 .mu.p(t)-1/a.sub.1 .eta.(t)+f(t).eta.(t),
• wherein:
• T=a duration of the gear shifting operation, that is, a gear-shifting time,
• t=a point in time during the gear-shifting operation, that is, 0.ltoreq.t.ltoreq.T;
• p(t)=the operating pressure at the point in time t;
• a.sub.1, a.sub.2 =constants specified in advance;
• .mu.=a coefficient of friction of the friction clutch means;
• .eta.(t)=a relative rotational speed between plates of the multiplate friction clutch means at the point in time t;
• .eta.(t)=a differential, with respect to time, of a relative rotational speed at a point in time t;
• and
• f(t)=a continuous function, specified in advance, satisfying the following relationship:
• f(0).eta.(0)=f(T).eta.(T)=0.