Method and device for monitoring direction indicator lights of a

Details Method and device for monitoring direction indicator lights of a Method and device for monitoring direction indicator lights of a

1991-04-03

1992-10-20

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

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

340642, 307 108, B60Q 1100

Patent

active

051573768

ABSTRACT:
Monitoring of trailer indicator lights includes a flasher pulse generator provided for generating, upon the switching on of a direction signalling switch, fixed pulse frequencies which can be changed over as a function of deviations of the load connected to the flasher pulse generator from its nominal load. The monitoring is carried out without requiring a change over of the flasher pulse generator to a "trailer mode" of operation. When the trailer is electrically connected, and upon the failure of one of the trailer indicator lights which are to be switched on and operated via a separate voltage supply at the frequency of the flasher pulse generator, one of the indicator lights of the towing vehicle is isolated from the electrical load of the flasher pulse generator. As a result of this simulated light failure, the frequency generated by the flasher pulse generator is changed over the imminent generation of a control signal to the vehicle driver. Because the isolated indicator light is actually intact, it continuous to be operated via an auxiliary switching device and is automatically switched on. The vehicle driver can therefore clearly recognize that a trailer indicator light has failed.

REFERENCES:
patent: 4105996 (1978-08-01), Shimizu
patent: 4348655 (1982-09-01), Goettler et al.
patent: 4723095 (1988-02-01), Svazas et al.
patent: 4910496 (1990-03-01), Hatanaka et al.
patent: 5030938 (1991-07-01), Bondzeit

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