| 摘要 |
<p>PURPOSE:To fill up various fail safes such as ground and short-circuit and protect positive and negative side transistors by changing a clutch current command signal with an output voltage and this signal returned from the output motion detecting means of a clutch to a current calculating means. CONSTITUTION:A clutch current command signal S1 is inputted from a clutch current calculating means 2 to the + input terminal of a deflection amplifier 14, and also a current return signal SF from a clutch current detecting resistance 13 is inputted to the -input terminal of the amplifier 14. The amplifier 14 outputs the deflection between the signals SI and SF to a PWM 15, and the PWM 15 modulates the pulse width according to the output of the amplifier 14 and supplies it to the base of a positive side transistor 11. Then, the transistor 11 conducts on/off operation according to the output pulse width of the PWM 15 and energizes an electromagnetic clutch 4 at the time of on. On the other hand, a clutch release signal SO from the calculating means 2 is inputted to the base of a negative side transistor 12, and the transistor 12 undergoes on/off control by the signal SO.</p> |
