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:
Oct. 21, 1986
Filed:
Mar. 22, 1984
William F Hill, Stafford, GB;
Lucas Industries, Public Limited Company, Birmingham, GB;
Abstract
An internal combustion engine ignition control includes a variable reluctance pick-up with a winding providing signals to an integrator the output of which controls an ignition switching circuit. The ignition switching circuit includes a current limiter circuit which operates to limit the coil current at a maximum level until the instant of ignition. A capacitor is charged and discharged under the control of the current limiter circuit so that the voltage on it depends on the ratio of the time for which the current limiter circuit is in operation to the ignition cycle duration. An active clamping circuit operates to override the integrator under the control of this capacitor so as to apply a variable preconditioning bias to the output of the integrator which has the effect of varying the instant at which the coil current is switched on. Closed loop dwell control is thus provided in a simple and convenient manner.