This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Unique Variable Reluctance System for Improved Noise Immunity
Technical Paper
2012-32-0053
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Accurate knowledge of crank angle is essential to the correct operation of both ignition and fuel injection systems, yet the interface is one of the most problematic in a fuel injection system. The problems are well known to car manufacturers, but for many small engine manufacturers they are yet to be encountered. This paper describes a semiconductor circuit solution as integrated into the MC33813 and MC33814 Application Specific ICs for small engines. A circuit has been developed that uses the mathematical properties of VR sensor signals to create a robust interface that makes the fewest possible mistakes in the counting of crank position teeth. Validation pictures show a high level of noise immunity thus demonstrating suitability for the variation present in high volume manufacturing.
Authors
Citation
Garrard, M. and Edwards, W., "Unique Variable Reluctance System for Improved Noise Immunity," SAE Technical Paper 2012-32-0053, 2012, https://doi.org/10.4271/2012-32-0053.Also In
References
- Proprietary crank interface circuits developed by Motorola and Freescale for many Tier 1 and OEM automotive applications
- Patent US5015878 Lasagna et al. Marelli Autotronica
- Patent US5477142 Good et al. Delco Electronics
- Data sheet, MAX9924, Maxim
- Applied Electromagnetism Hammond, P. Butterworth-Heinemann Ltd Dec 1971
- Automotive Electrics/Automotive Electronics Bosch Handbooks 2004