Ignition system dependent upon engine speed

USRE29862E · kind E · reissue

Assignee

• Robert Bosch GmbH · DE

Inventors

• Herman Roozenbeek · Schwieberdingen, DE
• Bernd Bodig · Leinfelden, DE
• Klaus Meyer · Ditzingen, DE
• Adolf Fritz · Stuttgart, DE

Key dates

• Filing date: May 5, 1977
• Grant date: Dec 19, 1978
• Expiry date: May 5, 1997

Classification

• Technology area (CPC —): General

Abstract

An internal combustion engine is comprised of at least one engine cylinder, devices for introducing a combustion mixture into the cylinder, and an electrical igniting element operative for igniting the combustion mixture in the cylinder once per ignition cycle. An ignition transformer has a secondary winding connected across the igniting element, and also has a primary winding. A flow of current is established through the primary winding. An electronic switch is connected in the current path of the primary winding to control the flow of current through the primary winding. A triggering unit generates a train of crankshaft-synchronized triggering signals. A monostable control circuit has a trigger input for receipt of such triggering signals, and is operative when triggered into the unstable state for rendering and maintaining the electronic switch nonconductive for the duration of the unstable state, so as to interrupt the flow of current through the primary winding and induce across the secondary winding a voltage surge causing the igniting element to ignite the combustion mixture in the engine cylinder. When the monostable control circuit reverts to its stable state, it renders a…