Communications: electrical – Land vehicle alarms or indicators – External alarm or indicator of movement
Patent
1999-04-16
2000-07-11
Hofsass, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
External alarm or indicator of movement
340458, 340459, 340464, B60Q 122
Patent
active
060879319
ABSTRACT:
A lamp driving circuit of a vehicle turn/hazard system blinks a turn hazard lamp 10 by passing a current through a relay contact C of a relay RY intermittently. The relay contact of the relay RY is turned on earlier than a semiconductor switch 20 which is provided between a relay and a battery is, and the former is turned off later than the latter is. During the period while both the relay contact and semiconductor switch are ON, the turn/hazard lamp is illuminated. A first and a second pulse signal are generated to turn on/off the relay contact C and semiconductor device, respectively. The relationship therebetween is changed at regular or random intervals. In this configuration, the lamp driving circuit for a turn hazard system can minimize exhaustion of the relay contact and improve the endurance thereof.
REFERENCES:
patent: 5072210 (1991-12-01), Kimmelman
patent: 5585784 (1996-12-01), Pabla et al.
patent: 5677671 (1997-10-01), Pabla et al.
patent: 5801623 (1998-09-01), Chen et al.
patent: 5872511 (1999-02-01), Ohkuma
Hofsass Jeffery A.
Nguyen Phung
Yazaki -Corporation
LandOfFree
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