Control system for an electromagnetic clutch for automobiles

In a control system for an electromagnetic clutch for an automobile having a belt-drive automatic transmission for an engine having a crankshaft and an accelerator pedal, comprising a driving pulley operatively connected to an input shaft of the transmission, a driven pulley and a belt engaged with both said pulleys, the transmission ratio of the transmission being automatically varied by changing effective diameters of both said pulleys, the improvement comprising

• an electromagnetic clutch having a coil for the engagement of the clutch and operatively connecting the crankshaft of said engine with the input shaft of said transmission, said electromagnetic clutch being engaged by exciting said coil with current for transmitting the output of said engine to the input shaft of said automatic transmission,
• rapid deceleration detecting means for producing an output signal when said engine is rapidly decelerated by rapid releasing of the accelerator pedal of said engine,
• gate circuit means for being actuated for a predetermined time period upon occurrence of said output signal of said detecting means, and
• another circuit means for passing the current intermittently through said coil during the actuation of said gate circuit means.

In a control system for an electromagnetic clutch for an automobile having an automatic transmission for an engine having a crankshaft and an accelerator pedal, the improvement comprising

• an electromagnetic clutch having a coil for engagement of the clutch and operatively connecting the crankshaft of said engine with an input shaft of said transmission, said electromagnetic clutch being engaged by exciting said coil with current for transmitting output of said engine to the input shaft of said automatic transmission,
• rapid deceleration detecting means for producing an output signal when said engine is rapidly decelerated by rapidly releasing the accelerator pedal,
• gate circuit means for being actuated for a predetermined time period upon occurrence of said output signal of said detecting means, and
• circuit means for passing the current intermittently through said coil during the actuation of said gate circuit means.