Electro-magnetic clutch control system for automobiles

A system for controlling an electro-magnetic clutch for an engine powered car, which has an accelerator pedal, ignition device for said engine, magnetizing coil for coupling said electro-magnetic clutch, comprising

• an acceleration detecting circuit responsive to the depression of said accelerator pedal for producing an output signal,
• an engine speed detecting circuit adapted to produce an output signal when the engine speed exceeds a predetermined speed,
• means for producing an output for increasing the current passing through said magnetizing coil, said means is a pulse generating circuit for producing pulses, the pulse separation of which decreases with an increase of the engine speed,
• gate means responsive to outputs of said acceleration detecting circuit and said means for producing a first output for increasing the current passing through said magnetizing coil and further responsive to said output of said engine speed detecting circuit for producing a second output for a rated current of said magnetizing coil,
• switch means provided in the circuit of said magnetizing coil and responsive to outputs of said gate means for allowing the current to pass through said magnetizing coil, and
• said switch means is a transistor, which is turned on by said first and second outputs of said gate means.

A system for controlling an electro-magnetic clutch for an engine powered car, which has an accelerator pedal, an ignition device for an engine of said car, and a magnetizing coil for coupling said electro-magnetic clutch, said system comprising

• an acceleration detecting circuit responsive to the depression of said accelerator pedal for producing an output signal,
• an engine speed detecting circuit means for producing a first output signal having one logic level when the speed of said engine exceeds a first predetermined speed and for producing a second output signal having another logic level when the engine speed decreases below a second predetermined speed lower than the first predetermined speed,
• a pulse generating circuit means responsive to ignition pulses by said ignition device for producing pulses having a duty factor varying with an increase in the engine speed,
• a first gate circuit responsive to outputs of said acceleration detecting circuit and to pulses from said pulse generating circuit means for producing output signals,
• a second gate circuit responsive to said first and second output signals of said engine speed detecting circuit means and to output signals of said first gate circuit for producing output signals, and
• switch means responsive to said output signals of said second gate circuit for controlling the current passing through said magnetizing coil and responsive to said first output signal for allowing a rated current to pass through the magnetizing coil and responsive to said second output signal to cut off the current for said magnetizing coil.