On-vehicle electronic device

Details On-vehicle electronic device On-vehicle electronic device

1992-08-17

1994-10-25

Pellinen, A. D.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307125, 307 98, B60L 108

Patent

active

053592301

ABSTRACT:
An on-vehicle electronic device includes a main body which is fastened to a vehicle and has a first terminal, and an operation unit which is detachably mounted in the main body and which has a second terminal electrically connected to the first terminal when the operation unit is mounted in the main body. The main body includes a reference power source applying a reference voltage to the first terminal, and a voltage detection unit for detecting a voltage applied to the first terminal. The main body further includes a mounting detection unit. The mounting detection unit determines, based on a difference between a first detection voltage detected by the voltage detection unit when the operation unit is mounted and a second detection voltage detected by the voltage detection unit when the operation unit is not mounted, whether or not the operation unit is mounted and electrically connected to the main body via the first and second terminals.

REFERENCES:
patent: 4542421 (1985-09-01), Fujibayashi
patent: 4734896 (1988-03-01), Soma et al.
patent: 4945335 (1990-07-01), Kimura et al.
patent: 5107244 (1992-04-01), Minamide et al.

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