Head lamp control method and apparatus, with PWM output regulation
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United States of America Patent
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-
Jun 20, 1989
Grant Date -
N/A
app pub date -
Oct 19, 1987
filing date -
Oct 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulse width modulation control unit for energizing a vehicle head lamp. During daylight operation of a motor vehicle the control unit energizes the head lamp by pulse width modulating the battery output and coupling the modulating output across the head lamp. As battery voltage changes the pulse width modulation is adjusted to maintain power output of the head lamp. An over current condition in a switching transistor is monitored and used to de-activate the pulse width modulation of the head lamp energization.
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