초록 ▼

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 prope

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.

대표청구항 ▼

An engine management system for controlling fuel delivery to an internal combustion engine having fuel delivery apparatus comprising: (a) a primary engine control unit including a microprocessor, said microprocessor being connected to first sensing means to receive and process signals representative

An engine management system for controlling fuel delivery to an internal combustion engine having fuel delivery apparatus comprising: (a) a primary engine control unit including a microprocessor, said microprocessor being connected to first sensing means to receive and process signals representative of first predetermined operating conditions and providing an output signal to said fuel delivery apparatus and a control signal indicative of the operating condition of said primary engine control unit; (b) a secondary engine control unit including a microprocessor connected to second sensing means to receive and process signals representative of a second predetermined operating condition to send an output signal to said fuel delivery apparatus; and (c) power switching control unit connected to a supply power and having switch means to direct said power supply to said primary engine control unit under normal operating conditions and maintaining said secondary engine control unit disconnected from power supply under said normal operating conditions, said switch means being operative to disconnect said primary engine control unit from said power supply and to connect said secondary engine control unit to power supply upon a predetermined change in said control signal from said primary engine control unit.