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:
Mar. 19, 2002
Filed:
May. 26, 2000
Kirk D. Doane, Essexville, MI (US);
John D. Zmierski, Cass City, MI (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A fuel pressure regulation system for use in a fuel pump system in which atomizing air is injected into the fuel delivered to the injector. The system includes both an air rail and a fuel rail and is operable to maintain the fuel pressure within the system at a consistent pressure above the air rail pressure. The system also includes a first pressure sensor, a second pressure sensor, a control circuit, and a fuel pressure pump or other fuel control device. The first and second pressure sensors are differential pressure sensors which measure the air and fuel pressure, respectively, convert those measurements into first and second electronic signals, and send those signals to the control circuit. The control circuit is an electronic circuit that includes a first stage, a second stage, and an output stage and provides the fuel pump with closed loop control based on the first and second signals. Preferably, the closed loop control is achieved using both proportional and integral control with the output being in the form of a pulse-width modulated signal. The fuel pump is in fluid communication with the fuel rail and adjusts the fluid pressure within the fuel rail according to the pulse-width insulated signal sent by the control circuit.