Electromagnetic clutch control system

摘要

The engagement force of an electromagnetic clutch can be precisely controlled at a target engagement force by a simple structure even when an air gap of the electromagnetic clutch varies. An electromagnetic clutch control system includes magnetic flux density sensors, a target engagement force calculating device, a target magnetic flux density calculating device, and a feedback control device. The target magnetic flux density calculating device calculates a target magnetic flux density phit based on a target engagement force Tt of electromagnetic clutches calculated by the target engagement force calculating device. The current supplied to the electromagnetic clutches is feedback controlled by the feedback control device so that an actual magnetic flux density phi detected by the magnetic flux density sensors agrees with the target magnetic flux density phit. This allows a target engagement force to be generated in the electromagnetic clutches by making the actual magnetic flux density agree precisely with the target magnetic flux density, even when the air gap varies due to wear of a frictional engagement member, etc. and the relationship between the actual magnetic flux density and the current supplied to the electromagnetic clutches changes.