Control arrangement for an occupant restraint system of an autom

Details Control arrangement for an occupant restraint system of an autom Control arrangement for an occupant restraint system of an autom

1990-06-27

1992-04-21

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Of collision or contact with external object

280735, 36442405, B60R 2100

Patent

active

051072459

ABSTRACT:
The function of a control arrangement for an occupant restraint system in an automobile is continuously monitored by monitoring circuit. The monitoring circuit checks the frequency of a check signal derived from the microcomputer clock signal using a counting device which is controlled by its own stable oscillator. The monitoring circuit supplies an enable signal to the microcomputer, when such frequency is correct. If the frequency of the check signal is not found to be correct the monitoring circuit supplies a drive signal for the operation of an indicating lamp. At the same time the supply of the trip signal to the trip device is prevented. An error message is produced and the trip signal is suppressed also if the monitoring circuit itself fails.

REFERENCES:
patent: 4087782 (1978-05-01), Oishi et al.
patent: 4410875 (1983-10-01), Spies et al.
patent: 4864202 (1989-09-01), Nitschke et al.

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