System for controlling an electromagnetic clutch for automobiles

Claim 1

In a system for controlling an electro-magnetic clutch of an internal combustion engine mounted on a vehicle which has an accelerator pedal, a drive member secured to a crankshaft of said internal combustion engine, a driven member adjacent said drive member, a transmission secured to said driven member and having multi-stage change gears and a shift lever therefor, a magnetizing coil provided in one of said members, and an electric circuit means including said magnetizing coil which is capable of passing excitation current through said magnetizing coil in a normal direction, the improvement comprising shift lever switch means for producing an output signal having one logic level during a shifting operation of the shift lever of said transmission, a neutral switch means for producing an output signal having one logic level in a neutral position of the shift lever, a clutch hold switch means for producing an output signal having one logic level when said accelerator pedal is depressed, logic circuit means responsive to said output signals of said shift lever switch means, said clutch hold switch means and said neutral switch means for providing an output signal having logic levels, said electric circuit means being responsive to said output signal of said logic circuit means for controlling the current flowing through said magnetizing coil, and said electric circuit means being so arranged that the current flows through said magnetizing coil with inverted polarity when the output signal from said logic circuit means has one logic level in the neutral position of said shift lever and that the excitation current flows through said magnetizing coil in said normal direction when the output signal of said logic circuit means has another logic level when said accelerator pedal is depressed in the neutral position of said shift lever for causing a double clutch operation.