Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-06-22
1989-10-10
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361196, 361195, 361187, 361154, 361160, 361170, H01H 4700
Patent
active
048736066
ABSTRACT:
A safety control device for an actuator of a flap solenoid valve, such as for an automatic transmission. The device includes a current control device which is connected to a shunt resistor for measuring the current through the solenoid valve and the current control device. It also includes a control package which measures the time between the starting of the power to the solenoid valve and the moment when the current reaches a threshold intensity. The control package compares this time with a time range which indicates the proper operation of the solenoid valve so that if the time falls outside this time range, the control package instructs the current control device to cut power to the solenoid valve.
REFERENCES:
patent: 4266261 (1981-05-01), Streit et al.
patent: 4328526 (1982-05-01), Dilger et al.
patent: 4446410 (1984-05-01), Yagura et al.
patent: 4628885 (1986-12-01), Ogburn et al.
patent: 4680877 (1987-07-01), Petrie
patent: 4729056 (1988-03-01), Edwards et al.
Pellinen A. D.
Regie Nationale des Usines Renault
Williams H. L.
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