Electronic control equipment for motor vehicles, particularly, e

Details Electronic control equipment for motor vehicles, particularly, e Electronic control equipment for motor vehicles, particularly, e

1995-05-01

1996-12-24

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 49, 361 91, 307 101, H02H 316

Patent

active

055878652

ABSTRACT:
Electronic control apparatus for motor vehicles. The apparatus includes a test circuit which causes a test current to flow through a load being operated by the apparatus and which detects the magnitude of the test current. From the magnitude of the test current, an evaluation circuit determines whether the ground potential of the control apparatus and the ground potential of the load are at different levels. In response to a potential difference between the two ground potentials, the evaluation circuit initiates countermeasures for preventing damage to the electronic control apparatus, such as selectively disconnecting the load with a power switch responsive to the evaluation circuit.

REFERENCES:
patent: 4709164 (1987-11-01), Giesl
patent: 4994933 (1991-02-01), Matsuoka
patent: 5166852 (1992-11-01), Sano
patent: 5205619 (1993-04-01), Holst et al.

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