Control system for a clutch of a motor vehicle

A control system for an electromagnetic clutch for a motor vehicle having an engine connected directly to said clutch, a transmission for transmitting power of said engine from an output member of said clutch to axles of vehicle driving wheels, a throttle position sensor for detecting a throttle opening degree of a throttle valve mounted on said engine and for producing a throttle position signal, an output member speed sensor for detecting speed of said axles and for producing an output member speed signal, an engine speed sensor for detecting engine speed and for generating an engine speed signal, a select position sensor for sensing a position of a selector lever for selecting ranges of the transmission and for producing a position signal, and an accelerator pedal switch for detecting depression degree of an accelerator pedal and for generating an accelerator signal, the improvement of the system which comprises:

• reverse mode deciding means responsive to said position signal and said engine speed signal for deciding a reverse excitation mode of said clutch and for producing a reverse mode signal;
• clutch current mode deciding means responsive to said reverse mode signal, said output member speed signal and said accelerator signal for deciding a clutch current mode and for generating a clutch current mode signal;
• ordinary start deciding means responsive to said clutch current mode signal, said position signal, said throttle position signal, said engine speed signal and said output member speed signal for deciding an ordinary start mode by comparing an actual starting condition with a standard condition stored in a table of a memory and for producing an ordinary start signal;
• and
• racing start deciding means responsive to said clutch current mode signal, said position signal, said throttle position signal, said engine speed signal and said output member speed signal for judging a racing start condition by comparing said actual starting condition with a standard racing condition stored in said table so as to rapidly increase clutch current after deciding said racing start condition for preventing said engine speed from excessively increasing.