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:
Dec. 04, 1984
Filed:
May. 19, 1982
William F Hill, Stafford, GB;
Lucas Industries, Birmingham, GB;
Abstract
An ignition system comprises a ferro-magnetic disc mounted on the distributor shaft and provided with four pairs of protuberances, the spacing of the two protuberances of each pair corresponding to maximum and minimum spark advance positions. The protuberances are detected by a first variable reluctance pick-up of fixed position and a second variable reluctance pick-up angularly movable by an engine load sensor. The two pick-ups, are connected respectively to two signal generators which produce a rectangular waveform of fixed phase and a rectangular waveform, the phase of which varies in accordance with engine load. The two waveforms have the same frequency. A function timing circuit responsive to both waveforms calculates engine speed, engine load and crank-shaft position and from these produces a trigger signal for each ignition spark. Further circuitry responsive to the trigger signals drives the ignition coil.