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:
May. 31, 1983
Filed:
Apr. 01, 1981
Peter W Harper, Ramonville St. Agne, FR;
Mark C Harvey, Yorktown, VA (US);
The Bendix Corporation, Southfield, MI (US);
Abstract
A digital-analog fuel injection system wherein fuel lean out is controlled by a fuel mapping circuit 36 which provides one of sixteen levels of percent lean out control of the fuel pulse width supplied to an injector. In order to provide an immediate update of the engine demands, a pulse generation circuit 72 operates in real time. The fuel mapping circuit 36 provides corrections to the pulse generating circuit on a sampled update basis. This is accomplished by using a digital word 34 generated by a microprocessor 10 to control a multiplying digital to analog converter whose reference input is an electrical signal (V.sub.MAP) representing the present manifold pressure and an offset voltage (V.sub.O) accounting for the several variable of the system such as the engine, injectors and pressure sensor. The output signal (V.sub.B) from the fuel mapping circuit 34 is then applied to a pulse generating circuit 72 to control the generation of fuel pulse width which is being applied to a fuel injector driver 46 (FIG. 5).