Control system for electromagnetic clutch for vehicle
AssigneesHitachi, Ltd., Nitachi Automotive Engineering Co. Ltd.
InventorsAkira Hasegawa, Kazuhiko Sato, Michimasa Horiuchi, Shun-ichiro Sugimoto
Life of this patent
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Abstract
A transmission includes a control unit which controls engagement/disengagement of an electromagnetic clutch such that it is disengaged when it is detected that a vehicle is at a stop, and such that the vehicle creeps at a predetermined speed when pressing of an accelerator pedal is detected.
Claims7
A control unit for controlling the operation of an electromagnetic clutch for an internal combustion engine of a vehicle in which the speed of the vehicle is controlled by an operator through actuation of an accelerator pedal and torque produced by the internal combustion engine is transferred to the vehicle through said electromagnetic clutch, comprising:
- means for determining the speed of the vehicle;
- detecting means for detecting actuation of said accelerator pedal;
- and
- processor means responsive to said vehicle speed determining means and said detecting means for controlling said electromagnetic clutch by:
- (a) engaging said electromagnetic clutch for creeping movement of the vehicle when said vehicle speed is less than a first predetermined speed and the accelerator pedal has been actuated;
- (b) maintaining a previous engagement of said electromagnetic clutch for maintaining creeping movement of the vehicle when actuation of said accelerator pedal is released so long as the vehicle speed is less than said first predetermined speed and greater than a second predetermined speed, said first predetermined speed being more than said second predetermined speed;
- and
- (c) disengaging said electromagnetic clutch when said vehicle speed drops below said second predetermined speed and said accelerator pedal has been released.
A control unit for controlling the operation of an electromagnetic clutch for an internal combustion engine of a vehicle in which the speed of the vehicle is controlled by an operator through actuation of an accelerator pedal and torque produced by the internal combustion engine is transferred to the vehicle through said electromagnetic clutch, comprising:
- means for determining the speed of the vehicle;
- detecting means for detecting actuation of said accelerator pedal;
- means for engaging said electromagnetic clutch for creeping movement of the vehicle when said vehicle speed is less than a first predetermined speed and the accelerator pedal has been actuated;
- means for maintaining a previous engagement of said electromagnetic clutch for maintaining creeping movement of the vehicle when actuation of said accelerator pedal is released so long as the vehicle speed is less than said first predetermined speed and greater than a second predetermined speed, said first predetermined speed being more than said second predetermined speed;
- and
- means for disengaging said electromagnetic clutch when said vehicle speed drops below said second predetermined speed and said accelerator pedal has been released.
Dependencies are inferred from the claim text.