Passenger protecting apparatus

Details Passenger protecting apparatus Passenger protecting apparatus

1992-06-04

1995-04-11

Pellinen, A. D.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307121, 280735, 340438, 36442405, B60R 2116

Patent

active

054061270

ABSTRACT:
A passenger protecting apparatus has a parallel connection of two current paths; a dummy firing current path having a dummy load and a first switch connected in series, and a firing current path having a driving device and at least one impact-sensitive switch as a second switch connected in series. A third switch in series with the aforementioned parallel circuit is closed when the third switch receives a signal indicative of an impact from a signal processing circuit. The impact-sensitive switch, mounted on the vehicle body, is closed when an impact greater than a predetermined value is exerted to the vehicle. When the vehicle has an impact exerted thereto, a diagnostic circuit directs the signal indicative of the impact to the third switch, which closes to allow the firing current to flow through the firing current path. The firing current causes the driving device to activate the passenger-protecting element. When diagnosing the third switch, the diagnosis circuit causes the first switch to close and outputs a signal indicative of an impact to the third switch through the signal processing circuit. A dummy firing current flows in the dummy firing current path through the third switch. The dummy load has a resistance substantially equal to that of the driving device, allowing the diagnostic circuit to monitor the voltage across the third switch to check the switch operation of the third switch with a dummy firing current substantially equal to the actual firing current.

REFERENCES:
patent: 4862091 (1989-08-01), Hillebrand
patent: 4950914 (1990-08-01), Kurihara et al.
patent: 5038134 (1991-08-01), Kondo et al.
patent: 5045835 (1991-09-01), Masegi et al.
patent: 5134306 (1992-07-01), Schumacher et al.
patent: 5155376 (1992-10-01), Okano
patent: 5181011 (1993-01-01), Okano
patent: 5204547 (1993-04-01), Schumacher et al.
patent: 5331211 (1994-07-01), Kondo et al.

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