A Study on Microcomputer-Controlled Variable Valve-Timing System
Date Published: 1995-02-01
Paper Number:950976
DOI: 10.4271/950976
Citation:
Li, J. and Zhang, K., "A Study on Microcomputer-Controlled Variable Valve-Timing System," SAE Technical Paper 950976, 1995, doi:10.4271/950976.
Author(s):
Jian-hong Li - Changchun Automotive Research Institute
Kangnian Zhang - Changchun Automotive Research Institute
Abstract:
This paper deals with the development of a system to control the inlet-valve-timing of a single - cam gasoline engine. With this scheme the camshaft can be phased continuously to any position within 60 crank degree range by an electronic control unit to reflect changes in engine operating conditions. A control strategy was established which would optimize power at wide -open throttle and minimize emissions at small throttle openings. For this system, a mechanical self-protection device and a fail -safe system have been developed. Development testing has shown that with the proper control strategies, the power, emission, and idle quality of the engine can all be improved.
Purchase more technical papers and save! With TechSelect,
you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
Learn more >
