Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1979-08-02
1981-08-18
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Fuel injection system
123499, F02B 300
Patent
active
042840511
ABSTRACT:
A method and apparatus for reliably switching electromagnetic control units, especially solenoid valves for blocking the idling fuel mixture in carburetor units of internal combustion engines during, for example, motor vehicle coasting. It is proposed to deenergize the solenoid valve at the beginning of the blocking operation for a time period ensuring a reliable valve release, initiating a current flow which preferably allows the solenoid valve to be at the brink of opening, and, at the desired instant of opening applying an overvoltage to the solenoid valve in a standby position, wherein the valve, though it has not as yet opened, requires merely a small additional pulse to open. The apparatus comprises an electrical switch connected in series with the solenoid valve which receives its control signal for deenergizing the solenoid from a timing element, the latter being responsive to engine operation parameters, such as air flow or pressure in the intake manifold, and a storage means for applying an additional or auxiliary pulse for opening the solenoid valve at a given instant and/or in response to operating parameters. Also disclosed is a protection arrangement for the circuitry of the apparatus in the event of a short circuit.
REFERENCES:
patent: 2084426 (1937-06-01), Berry
patent: 3768449 (1973-10-01), Lindberg
patent: 3786344 (1974-01-01), Davis et al.
patent: 3809028 (1974-05-01), Luchaco
patent: 3866584 (1975-02-01), Bigalke et al.
patent: 3982505 (1976-09-01), Rivere
patent: 4180026 (1979-12-01), Schulzke et al.
Greigg Edwin E.
Myhre Charles J.
Nelli R. A.
Robert & Bosch GmbH
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