Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-07-27
1997-02-25
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
36443111, F02D 4122
Patent
active
056051352
ABSTRACT:
An engine management system for regulating fuel delivery to an engine. The system has a primary engine control unit (ECU) and a secondary ECU interconnected by a switching system. A microprocessor in the primary ECU receives signals from primary sensors to regulate the injectors to deliver the proper A/F ratio. In the event of primary sensor failure or computer problem, the microprocessor relies on a selected alternate sensor input. Secondary sensors "fine tune" the control signal from the primary ECU. Switching to the secondary ECU is automatically accomplished by a switching unit upon the existence or loss of an output signal from the primary ECU. In the preferred embodiment, the switching unit includes three normally closed relays, the first two of which are for independent power supply. Upon loss of a signal from the primary, the first two relays close directing power to the secondary ECU and illuminating a trouble light. The secondary ECU operates by monitoring one or more basic control parameters.
REFERENCES:
patent: 3834361 (1974-09-01), Keely
patent: 4989569 (1991-02-01), Eidler
patent: 5497751 (1996-03-01), Ohtake
Argenbright Tony M.
Nelson Gregory J.
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