Protective control system for engine

Details Protective control system for engine Protective control system for engine

1983-02-24

1985-02-26

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361154, 361190, 361 25, H01H 4722

Patent

active

045020906

ABSTRACT:
A protective control system is provided for stopping an engine-driven pump when a fault condition such as low oil level, low oil pressure or high temperature occurs in the engine. The protective control system includes an electric battery, a solenoid valve regulating fuel (or air) flow to the engine and energizable from the battery, an electronic circuit energizable from the battery for controlling the solenoid valve, and fault-sensing switches for controlling the electronic circuit and shutting off the fuel supply to stop the engine upon occurrence of a fault. The electronic circuit includes a solid state voltage regulator device connected between the battery and the solenoid valve, and this device includes an adjustment terminal which is biased to control the power supply to the solenoid valve. The electronic circuit further includes a transistor which controls the bias on the adjustment terminal and the transistor, in turn, is responsive to operation of any one of the fault-responsive switches. An LED in the control system indicates the energization status of the solenoid valve.

REFERENCES:
patent: 3904938 (1975-09-01), Martin

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