Abstract: An on-board current control device comprising: a processing unit 1 operating a current command value from engine control information and driving control information, outputting a current basic pulse width modulating signal, and outputting a current adjusting pulse width modulating signal from current adjusting information; a current regulator 60 modulating the current basic pulse width modulating signal by the current adjusting pulse width modulating signal and generating a current command pulse width modulating signal; a smoothing filter 14 converting the current command pulse width modulating signal to a current command signal like a direct current; a comparator comparing the current command signal like the direct current with a current feed-back signal and outputting a signal corresponding to thus obtained deviation; an output transistor controlling a current value to a load by an output from the comparator; and a current detecting means 46 detecting the load current and generating the current feed-back si

Abstract: In a vehicle electromagnetic clutch control device, clutch current calculating means outputs a clutch current analog signal according to given travel control data and engine control data, a current difference detector obtains the difference between the clutch current analog signal and a clutch current feedback signal, a first output transistor is operated according to the difference thus obtained to energize the electromagnetic clutch, the clutch current flowing in a second output transistor is detected with a current detecting resistor, and a voltage corresponding to the clutch current thus detected is applied to an operational amplifier, so as to output the clutch current feedback signal with the aid of a reference resistor, a feedback resistor and the amplification factor thereof. An adjusting resistor is connected in parallel to the reference resistor, to adjust the clutch current.

Abstract: A temperature detection device for an electromagnetic clutch of a vehicle comprises an output circuit operation detection device for detecting an output terminal voltage of the clutch and a current feedback signal corresponding to a clutch current, clutch current a calculation device which responds to running control information and engine control information for providing a clutch current instruction signal and a clutch open signal, responds to the clutch output terminal voltage fedback from the clutch output circuit operation detection device for calculating a clutch voltage by taking a voltage drop in a wiring and a feeding mechanism of the clutch and responds to this clutch voltage and the clutch current corresponding to the current feedback signal for calculating a clutch resistance to thereby calculate a clutch temperature and the clutch current instruction signal and clutch current control device responsive to a deviation between the clutch current instruction signal and the current feedback signal and