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, 1991
Filed:
Apr. 14, 1987
William F Hill, Stafford, GB;
Lucas Industries public limited company, Birmingham, GB;
Abstract
A system for regulating the idling speed of an internal combustion engine comprises a circuit for generating the ignition spark, when the engine is idling, upon expiry of a predetermined time delay from an initial crankshaft position, which circuit is enabled only after the crankshaft has reached a first limiting position, and enforced when the crankshaft reaches a second limiting position if the time delay has not expired. The spark timing therefore varies smoothly with speed between the first and second limiting positions of the crankshaft, but being retarded to the second limiting position for large over-speed errors or advanced to the first limiting position for large under-speed errors. It also reverts to the second limiting position for speeds below half normal idling speeds (cranking speeds). The time delay may be controlled in response to engine operating variables, for example using a closed-loop idling speed control of conventional type and preferably with phase advance compensation to further improve the dynamic response of the idling speed regulating system.