The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 1990
Filed:
Jul. 14, 1988
Laverne A Caron, Naperville, IL (US);
Maciej Labowicz, Elk Grove Village, IL (US);
Navistar International Transporation Corp., Chicago, IL (US);
Abstract
An electronic module interfaces a microcomputer with the fuel injection equipment of a diesel engine so that the microcomputer, acting through the module, exercises control over the fuel injected into the engine. A pulse width modulated fuel deliver control signal issued by the microcomputer is transmitted through the module to energize a proportional solenoid actuator that positions the fuel rack. Rack position is sensed by an eddy current sensor that provides feedback through the module to the microcomputer so that the rack position is closed-loop controlled. The sensor has a measurement coil for measuring rack position and a reference coil for temperature compensation. The two coils are connected in a circuit of the module that produces a pulse width modulated feedback signal which is supplied to the microcomputer in synchronism with the fuel deliver control signal. This latter circuit comprises an L/R monostable for each coil and pulse stretchers that stretch the output pulses from the monostables. The pulse stretchers' outputs are supplied to a gate that develops the feedback signal to the microcomputer.