Ignition system for internal combustion engines

US5370099A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Koelle · Schwieberdingen, DE
• Helmut Randoll · Leinfelden, DE
• Martin Streib · Leinfelden, DE

Key dates

• Filing date: Apr 15, 1994
• Grant date: Dec 6, 1994
• Expiry date: Apr 15, 2014

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/027
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The ignition system for a four-cycle gasoline engine having at least one cylinder includes a spark plug for each cylinder and an ignition coil for each spark plug so that each spark plug has its own ignition coil with a primary and secondary side as well as a control device for controlling the timing of the firing of the spark plugs via the individual ignition coils according to a predetermined firing sequence connected to each of the ignition coils. To satisfy strict requirements regarding exhaust emission by monitoring operation of the individual cylinders while avoiding additional sensors, the control device includes a circuit for analyzing and storing the ignition voltages on the primary side of each ignition coil measured at a number of different times for successive ignition events in each cylinder and a comparator device which compares the dependencies of the ignition voltage on time for two successive ignition events and a phase signal generating device which produces a phase signal from the results of the comparison of the ignition voltages mmade by the comparator device for control of the fuel injection and spark timing for each cylinder.