Electronic fuel injector driver circuit

Patent · Tue Dec 23 04:00:00 EST 1986

OSTI ID:7048581

Kissel, W R

An electronic driver circuit is described for controlling the energization of a solenoid coil, forming part of an electromagnetic fuel injection valve, in response to an injector control pulse, produced by a main fuel injection control circuit, comprising: a current regulating circuit including a power transistor connected in series with the coil, forming part of an electromagnetic fuel injection valve, and a current sensing resistor between a power source and ground. It also has a first switching transistor responsive to the injector control pulse, produced by a main fuel injection control circuit, for controlling the actuation of the power transistor; a free-wheeling circuit connected in parallel with the power transistor and including a diode and a second switching transistor actuation of which is also controlled by the first switching transistor so that the free-wheeling circuit is operative to allow current to flow to the solenoid coil. This forms parts of an electromagnetic fuel injection valve, during the injector control pulse, produced by a main fuel injection control circuit; and a first comparator having one input thereof connected to the current sensing resistor and its other input thereof connected to receive a first reference signal from a reference circuit.

• Assignee: Chrysler Motors Corp., Highland Park, MI
• Patent Number(s): US 4631628
• OSTI ID: 7048581
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
COMPARATOR CIRCUITS
CONTROL EQUIPMENT
ELECTRIC COILS
ELECTRIC GROUNDS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTROMAGNETISM
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
MAGNETISM
PULSES
RESISTORS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SIGNALS
SOLENOIDS
SWITCHING CIRCUITS
TRANSISTORS
VALVES
VEHICLES