Supply voltage variation compensated ignition system for an internal combustion engine

US4185603A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Sohner · Schorndorf, DE
• Gerd Hohne · Ludwigsburg, DE
• Peter Werner · Wiernsheim, DE
• Ingo Gorille · Oberriexingen, DE
• Herman Roozenbeek · Schwieberdingen, DE

Key dates

• Filing date: Dec 29, 1977
• Grant date: Jan 29, 1980
• Expiry date: Dec 29, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P3/0453
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To operate an ignition control transistor, connected into the primary ignition coil under minimum saturation condition regardless of voltage level of the supply voltage, delivered, for example, from the battery of an automotive vehicle, at least one timing circuit is connected to the voltage supply to have a timing interval which varies as a function of supply voltage, the timing interval controlling the duration of current flow through the transistor as a function of supply voltage so that the transistor will be conductive for the required time to store magnetic energy in the coil, though not for an excessively long period of time regardless of the level of supply voltage within the limits normally experienced in automotive ignition systems.