Circuit layout for ion current measurement

US5814994A · kind A · utility

Assignees

• Temic Telefunken Microelectronik · DE
• Daimler-Benz AG · DE

Inventors

• Peter Hohner · Echterdingen, DE
• Jens Schirmer · Heilbronn, DE

Key dates

• Filing date: Jul 3, 1996
• Grant date: Sep 29, 1998
• Expiry date: Jul 3, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P2017/128
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

With a transistor ignition system, in order to generate an ion current measurement signal at the secondary end, the ignition transistor, following an ignition triggering impulse, will be driven such that a saw-toothed collector current results as a primary current, and whose rate of increase is selected such that the quasi-stationary direct voltage generated hereby at the secondary end will not trigger any ignition process. The advantage is that for generating such a measurement signal as well as for its evaluation only a few components are required.