Short-circuit and ground fault detecting apparatus for automotiv

Details Short-circuit and ground fault detecting apparatus for automotiv Short-circuit and ground fault detecting apparatus for automotiv

1990-06-29

1992-02-18

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340438, B60Q 100

Patent

active

050898043

ABSTRACT:
The short-circuit and ground fault detecting apparatus for automotive electromagnetic clutches consists of a clutch current calculating device, a clutch current control device, and a clutchoutput cir;cuit operation detecting device. The clutch current control device has two output transistors on the positive and negative side of the clutch, serving as switches connected to current supply mechanisms of the magnetic clutch. The magnetic clutch is energized and deenergized by turning on and off the output transistors. The voltages at the output transistors are sent to the clutch output circuit operation detecting device, where they are removed of ripples and converted into digital signals and then fed back to the clutch current calculating device, which in turn checks the digitized voltages for any fault. In the event of a failure of the clutch current control device due to short-circuit or ground fault, the clutch current calculating device takes the resultant abnormal voltages as an indication of the fault and takes necessary actions to turn off the two output transistors, thereby releasing the clutch and protecting these transistors from damage.

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