Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1987-12-14
1989-02-21
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 10LS, 340 62, 340 69, 340 72, H02G 300
Patent
active
048067822
ABSTRACT:
The present invention relates to an auxiliary brake light control system which has its primary application in motor vehicles equipped with standard transmissions. In such vehicles, the brake lights are normally illuminated by means of a pressure switch associated with the brake pedal whenever pressure is manually-applied to the brake pedal by the driver. However, as the car slows toward a stop, or after it has actually stopped the driver normally releases his foot from the brake pedal and moves his left foot over to the clutch and his right foot over to the gas pedal thereby turning off the brake light to falsely indicate to those following that the car is not stopped. However, since the car is actually cruising at a very low speed or stopped, severe safety hazards may result. The present invention provides an auxiliary brake light control system which senses the motion of the motor vehicle by means of magnets attached to a rotating shaft whose speed of rotation is proportional to the speed of the motor vehicle to generate a first signal when the speed of the motor vehicle is faster than a predetermined speed and a second signal when it is moving slower than the predetermined speed. A relay coil is normally energized in response to the first signal to keep the brake lights off unless the operator applies pressure to the brake pedal, but for switching the relay coil to a de-energized state whenever the speed falls below a predetermined value for turning on the brake lights even if the operator removes his foot from the brake pedal. The detected signal from the rotating shaft is amplified, smoothed to a DC level, and applied to a comparator whose output controls a transistor switch to maintain the relay coil energized or de-energized, as desired. A DPDT switch is responsive to the state of the relay coil for supplying 12 volt battery potential to the brake lights when the relay coil is de-energized.
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patent: 4594574 (1986-06-01), Thurman
Ip Paul
Padgett, Jr. Charles P.
Shoop Jr. William M.
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