Title: Simplified computer ignition control system

Abstract: To control the ignition timing in a multicylinder engine, the computer output signal which controls the current flow through the ignition coil for generating the spark in the first cylinder is delayed and then applied to the ignition coil controlling the spark in a subsequent cylinder. The computer output signal is delayed by passing through a shift register whose clock input is derived from a pulse generator generating a pulse for each predetermined incremental angular rotation of the crankshaft. If a single ignition coil and a distributor are used, the computer output signal and the delayed computer output signal are applied to an OR gate whose output controls a switch controlling the current through the ignition coil. When more than one ignition coil is used, the computer output signal is applied to a switch controlling the current through the first coil, the delayed computer output signal to a switch controlling the current to a second coil. Further delays may be furnished for a control of sparking in additional cylinders.

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Inventors: Borst, Wolfgang (Schwieberdingen, DE, US)
Klotzner, Winfried (Maulbronn, DE, US)
Pagel, Ernst-Olav (Bohmfeld, DE, US)
Vetter, Hermann (Hessigheim, DE, US)

Application Number: 894335
Filing Date: 1978-04-07
Publication_date: 1980-06-17
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Class(es): 123/406.59 123/643
Other Classes:
US Patent Ref:

3621826	Nov, 1971	Chrestensen	123/148.
3935844	Feb, 1976	Nishimiya	123/148.
3955723	May, 1976	Richards	123/148.
4104997	Aug, 1978	Padgitt	123/148.

Other Refs:
Primary Examiner: Cox, Ronald B.
Assistant Examiner:
Attorney: Frishauf, Holtz, Goodman & Woodward