Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1988-07-26
1989-03-14
Roskoski, Bernard
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 91, 290 37R, 123333, 123335, H01H 4304
Patent
active
048126713
ABSTRACT:
A circuit for disengaging an electrically actuated transmission brake of a racing car has a bank of transistors in series with the brake to hold the brake on at the beginning of a race. The bases of the transistors are connected through normally open contacts of a relay to the emitter of a transistor that can be turned on or off by an optoisolator and the brake is connected through diodes to the relay coil to isolate the transistor bases once the brake has been disengaged. The optoisolator is connected, through diodes, to the zero count terminals of two clocked, programmable counters either of which will turn the optoisolator off at the end of a count. Reset terminals of both counters are connected to the outputs of a flip-flop to disable one counter and toggling of the flip-flop is effected by closing normally open contacts of a second relay to complete a circuit between the flip-flop input and a voltage regulator output through a Schmitt trigger. The second relay contacts are also connected to preset enable terminals of the counters to enter preselected numbers into the counters and prevent counting while the relay is energized. The relay is energized by closure of a starting switch connected between the second relay coil and the car battery so that release of the switch will enable one counter to provide a preselected time delay in the release of the brake.
REFERENCES:
patent: Re32474 (1987-08-01), Reid
patent: 4209816 (1980-06-01), Hansen
patent: 4467219 (1984-08-01), Reid
patent: 4490620 (1984-12-01), Hansen
patent: 4500794 (1985-02-01), Hamano et al.
patent: 4596215 (1986-06-01), Palesotti
patent: 4651018 (1987-03-01), Peterson
B. F. Electronics, Inc.
Burdick Glen M.
Ip Paul
Roskoski Bernard
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