Position displacement and speed sensor system, particularly for combination with an automotive engine control computer

US4700305A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Lotterbach · Markgröningen, DE
• Manfred Schenk · Fellbach, DE
• Udo Zucker · Brackenheim, DE
• David Van Belzen · Hemmingen, DE
• Jan F. van Woudenberg · Schwieberdingen, DE

Key dates

• Filing date: Jun 13, 1986
• Grant date: Oct 13, 1987
• Expiry date: Jun 13, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/4815
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To provide control of a vehicle engine computer from a segmental disk transducer by indicating a specific marker angular position of the crankshaft, to, characterize a specific cylinder in a multi-cylinder engine, the disk (1) has uniformly spaced segments (10, 20, 30, 40) thereon, the number of segments corresponding to the number of cylinders; one of the segments is foreshortened, so that the passage of the leading flank (11) thereof past a stationary pick-up transducer (2) will occur at a time later than that of the leading edges or flanks (21, 31, 41) of the remaining segments. The trailing flanks (12, 22, 32, 42) of all the segments are identical, and signals derived by processing the trailing flanks can be used to obtain speed signals; by processing the leading flanks, interrupt signals are applied to an interrupt input (3f) of a vehicle computer (3) to initiate a subroutine or subprogram. Additionally, a clock is started which, by counting, stores a representation of the circumferential length of the largest one of the segments. The length representation, as stored, is compared with a subsequent count in a comparator (9) and, if the counts do not match, this indicates that t…