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. 05, 1985
Filed:
Oct. 14, 1982
Walter Hinke, Ludwigsburg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To provide bipolar needle pulses in which oppositely polarized pulses occur close together to form pulse pairs, with long time intervals between pulse pairs, a pair of pole disks (10, 11) are located on a rotor (91, 12) with a permanent magnet (13) interposed. The disks have radially and axially extending claws (15a, 15b, 16) formed thereon, the axial extensions being directed towards each other, but the claws (15a, 15b) projecting from one disk (10) being arranged in claw element pairs with which the claws (16) from the other disk, and magnetically oppositely polarized, are interdigited. The magnetic field, passing through the air gap between the claws, is sensed by a stationary pick-up such as a Hall sensor, a Wiegand sensor, or a magnetic field plate. When used for ignition timing of an internal combustion engine, the number of interdigited claws may correspond to the number of cylinders, and the claw pairs are spaced closely together so that the time (t.sub.b) between oppositely polarized pulse pairs (17, 18) derived from the change in magnetic field upon induction with the sensor, will be large with respect to the timing between oppositely polarized pulses.