Ignition system for an internal combustion engine

US4448180A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernd Bodig · Leinfelden, DE
• Gerd Hohne · Ludwigsburg, DE
• Bernd Kalkhof · Reutlingen, DE

Key dates

• Filing date: Oct 13, 1982
• Grant date: May 15, 1984
• Expiry date: Oct 13, 2002

Classification

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

Abstract

A timing wave generator 26 provides the same input to two threshold switches that switch on at approximately the same time but have different switching hysteresis. The switch with the smaller hysteresis can affect ignition timing only through a delay circuit while the other can do so directly. If the engine stalls the delay circuit will assure that the primary current is shut off in a short time. In normal operation the large hysteresis of one of the threshold switches is in control and provides insensitivity to disturbance, but during startup the characteristics of the delay circuit can provide the appropriate ignition timing.