Semiconductor controlled ignition systems for internal combustion engines

US3949722A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hans Linstedt
• Helmut Roth · Stuttgart, DE
• Gotz Bundschuh
• Gerd Hohne · Ludwigsburg, DE
• Bernd Bodig · Leinfelden, DE
• Gert Strelow
• Peter Schmidt · Schwieberdingen, DE
• Gerhard Sohner · Schorndorf, DE
• Herman Roozenbeek · Schwieberdingen, DE
• Hartmut Michel

Key dates

• Filing date: Jul 23, 1974
• Grant date: Apr 13, 1976
• Expiry date: Jul 23, 1994

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P3/0552
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To improve the operation of semiconductor control ignition systems under widely varying supply voltage conditions, a voltage divider having a division tap point is connected in parallel to the main switching part of the switching transistor of the ignition system, and a voltage breakdown element, typically a Zener diode is connected from the tap point to the control electrodes of the semiconductor switch to provide an additional control voltage thereto if the voltage at the tap point exceeds a value leading to breakdown of the breakdown device (Zener diode); the main control circuit for the main ignition transistor may be conventional.