Voltage limited ignition system, particularly for an internal combustion engine

US4114582A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

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

Key dates

• Filing date: Mar 11, 1977
• Grant date: Sep 19, 1978
• Expiry date: Mar 11, 1997

Classification

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

Abstract

To prevent application of excessive spark energy in an ignition system designed for proper firing voltages even under low-battery voltage conditions, upon rise of the battery voltage to normal or excessive values, a voltage sensing circuit, including a threshold stage, is connected to the secondary of the ignition coil to sense the secondary voltage, the threshold stage providing an output when the voltage is exceeded and blocking continued supply of power to the ignition coil of the system to thereby limit the ignition voltage.