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. 29, 1990
Filed:
Mar. 27, 1989
Satoru Ohkubo, Amagasaki, JP;
Toshio Iwata, Himeji, JP;
Abstract
An air-to-fuel ratio control device for an internal combustion engine is disclosed, which comprises a pressure sensor for detecting the pressure P within a cylinder of the engine, and means for computing an actual value of the ratio (dP/d.theta.)max/Pmax, wherein (dP/d.theta.)max is the maximum rate of change in pressure P within the cylinder with respect to the crank angle .theta. and Pmax is the maximum pressure in the cylinder during a predetermined interval in a cycle of the cylinder. A target value of the ratio (dP/d.theta.)max/Pmax is obtained by converting the optimum air-to-fuel ratio corresponding to the operating condition of the engine, the conversion being effected by means of a relationship established between the values of the air-to-fuel ratio and those of the ratio (dP/d.theta.)max/Pmax. A control element controls the amount of injected fuel to reduce the deviation of the actual value of the ratio (dP/d.theta.)max/Pmax with respect to the target value thereof.