Internal combustion engine semi-conductor ignition control system

US4077379A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Jundt · Ludwigsburg, DE
• Bernd Bodig · Leinfelden, DE
• Helmut Roth · Stuttgart, DE
• Gerhard Sohner · Schorndorf, DE
• Peter Werner · Wiernsheim, DE

Key dates

• Filing date: Sep 20, 1976
• Grant date: Mar 7, 1978
• Expiry date: Sep 20, 1996

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P11/025
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To prevent generation of a spurious spark at the spark plug if the distributor braker control assembly should have commanded an ignition control transistor to be conductive and when the ignition switch is disconnected under those conditions, thus cutting off power to the ignition control transistor rendering it non-conductive and causing spurious voltage pulses which results in a spark at the ignition, a control path is provided connected to a control transistor for the actual ignition transistor and connected in circuit with the current flow due to the energy stored in the ignition coil to control the emitter-collector path of the ignition switching transistor to continue to remain conductive for a short period of time to drain off the stored energy in the coil, although the main ignition switch has been opened.