Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1987-04-13
1988-08-09
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361187, 361203, 361170, 361152, 307 10R, 307118, 307132EA, 280 6R, 280707, H01H 4718
Patent
active
047632224
ABSTRACT:
A motor vehicle suspension control includes a solenoid actuator having an actuating coil connected in series with a transistor across an electric power source and circuit protection apparatus for the transistor. The voltage across the transistor is monitored, after a short time delay following turn-on, as a signal indicative of excessive current therethrough. If the signal so indicates, the transistor is turned off for a period of time and then turned on again for another try. This continues for a predetermined maximum number of attempts. Specific clocked digital circuitry is disclosed for controlling the operation and producing the different required time delays or counts.
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patent: 4618908 (1986-10-01), Anttila
Foust Jeff A.
Heaston Bruce A.
General Motors Corporation
Pellinen A. D.
Sigler Robert M.
Williams Howard L.
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