Ignition system for internal combustion engines

US4337744A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl Seeger · Ditzingen, DE
• Werner Jundt · Ludwigsburg, DE
• Manfred Mezger · Markgröningen, DE
• Uwe Kiencke · Ludwigsburg, DE
• Jurgen Wesemeyer · Nuremberg, DE
• Georg Haubner · Starnberg, DE
• Werner Meier · Burlington, US

Key dates

• Filing date: Dec 31, 1980
• Grant date: Jul 6, 1982
• Expiry date: Dec 31, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Clock pulses are counted to provide a count indicative of speed in a counter that is reset with every revolution of a reference mark. The difference between successive counts is multiplied by a fractional factor, which is not necessarily the same for acceleration and deceleration, then added algebraically to the current count value. The acceleration-corrected speed value is then multiplied by a parameter-dependent digital value obtained from a summing circuit to which various engine condition parameters are supplied and the output of the last-mentioned multiplier is supplied to a comparator to which the current count of clock pulses beginning with the reference mark passage is compared. When the comparator finds the match, spark ignition takes place. Another counter counts the clock pulses following each reference mark for sequencing multiplexers that enable some components to serve in more than one operation, in effect controlling the flow of digital values around various loops in the circuit.