VEHICLE ELECTROMAGNETIC CLUTCH CONTROL DEVICE COMPRISES SMOOTHING FILTER AT PWM OUTPUT

A vehicle electromagnetic clutch control device comprises: a microcomputer 101 having a PWM modulator 101a for providing a current instruction signal according to travel control data SE and engine control data SD to output a pulse width modulation signal, and for outputting a clutch release signal to release an electromagnetic clutch 502; a PWM smoothing filter 902 for removing high frequency components from the pulse width modulation signal to obtain a substantially DC current signal; a PWM comparator 201 for comparing the substantially DC current signal with a current feedback signal If to subject the difference signal therebetween to pulse width modulation; a FWM control output transistor 406 which operates in response to the pulse width modulation signal outputted by the PWM comparator, for controlling clutch current; a quick-break output transistor 601 which is turned when the clutch is energised; an amplifier 301 for detecting the clutch current flowing when the quick-break output transistor is turned on and providing the current feedback signal; and a signal converting transistor 607 for rendering the quick-break transistor 601 non-conductive in response to the clutch release signal.