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The Effect of Exhaust Variable Cam Phaser Transients on Equivalence Ratio Control in an SI 4 Stroke Engine
Technical Paper
2005-01-0763
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
It is a well established fact that variable camshaft phasing can be used to reduce engine out emissions during steady state operation. However, a transition in camshaft timing which often accompanies engine speed / load changes, can have a significant dynamic impact on volumetric efficiency. The change in volumetric efficiency can be highly unpredictable, and can last for several engine cycles following the endpoint of cam movement. Since precise control of catalyst feedgas equivalence ratio is crucial to meeting increasingly stringent automotive emission requirements, the steady state benefits of cam phasing can be overshadowed by the loss of A/F control during transient operation if the engine control algorithms are not properly designed and calibrated. This paper investigates the impact of exhaust variable cam phaser transients on equivalence ratio control, and the mechanism by which volumetric efficiency is affected.
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Citation
Worm, J., "The Effect of Exhaust Variable Cam Phaser Transients on Equivalence Ratio Control in an SI 4 Stroke Engine," SAE Technical Paper 2005-01-0763, 2005, https://doi.org/10.4271/2005-01-0763.Also In
References
- Worm, J. “An Evaluation of Several Methods for Calculating Transient Trapped Air Mass with Emphasis on the “Delta P” Approach” SAE Paper 2005-01-0990
- Akimoto, A. Itoh, H. Suzuki, H. “Development of ΔP Method to Optimize Transient A/F Behavior in MPI Engine” JSAE 10 4 1989