Multiple spark ignition system for an internal combustion engine

US4217872A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Friedrich Rabus · Schwieberdingen, DE
• Gunter Grather · Pinache, DE

Key dates

• Filing date: Mar 11, 1977
• Grant date: Aug 19, 1980
• Expiry date: Mar 11, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P15/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A frequency generator is enabled when an ignition event is to occur, to provide a sequence of current pulses to an ignition coil, so that multiple sparks will be commanded for any one single ignition event. To compensate for changes in operating parameters, particularly low-voltage condition of supply current, the frequency generator is controllable to change the pulse width, or the frequency thereof. To simply compensate for voltage variations, the frequency generator is a voltage controlled oscillator (VCO), controlled by the electrical supply network, typically the battery of a vehicle.