This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Management System for Continuously Variable Valve Lift Gasoline Engine
Technical Paper
2007-01-1200
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A continuously variable valve lift gasoline engine can improve fuel consumption by reducing pumping loss and increase maximum torque by optimizing valve lift and cam phase according to engine speed. In this research, a new control system to simultaneously ensure good driveability and low emissions was developed for this low fuel consumption, high power engine. New suction air management through a master-slave control made it possible to achieve low fuel consumption and good driveability. To regulate the idle speed, a new controller featuring a two-degree-of-freedom sliding-mode algorithm with cooperative control was designed. This controller can improve the stability of idle speed and achieve the idle operation with a lower engine speed. To reduce emissions during cold start condition, an ignition timing control was developed that combine I-P control with a sliding mode control algorithm. This enables the engine speed to reach the target value smoothly and promotes early activation of the catalytic converter. To reduce influence of disparities between individual cylinder air-fuel ratios, a new optimal control was designed using a sliding mode control mechanism with an expanded delta-sigma modulation algorithm. By applying this to secondary O2 feedback, the post-catalyst O2 sensor output can be controlled precisely and the catalytic conversion efficiency can be improved. Using these new technologies, simultaneous low emissions and good driveability were made possible without compromising the CVTL engine's unique advantages of low fuel consumption and high output.
Recommended Content
Authors
Topic
Citation
Tagami, H., Yasui, Y., Sato, M., and Ito, H., "Management System for Continuously Variable Valve Lift Gasoline Engine," SAE Technical Paper 2007-01-1200, 2007, https://doi.org/10.4271/2007-01-1200.Also In
References
- Wilhelm, H. Overview of Current Continuously Variable Valve Lift Systems for Four-Stroke Spark-Ignition Engine and the Criteria for their Design Ratings SAE technical paper 2004-01-1263 March 2004
- Tsuyoshi, A. A Study of Friction Characteristics of Continuously Variable Valve Event and Lift (VEL) System SAE technical paper 2006-01-0222 April 2006
- Frank, H. INA EcoValve: A Continuously Variable Valve Lift (CVVL) System SAE International 2004-01-1391
- Ken, Y. Fully Variable Valve Actuation System from BMW, VALVETRONIC Engine Technology 5 2003
- Naoki, Y. Performance Improvement of the Low Engine Speed Range of Continuous Intake Variable Valve Timing Mechanism Mounted Four Cylinder Gasoline Engine with Three-dimensional Cam SAE technical paper 20035060 May 2003
- Kosuke, H. Accurate Idle Speed Control for Gasoline Engine with Variable Valve Actuation Proceedings of JSAE Annual Congress May 2006
- Kenzo, N. Sliding Mode Control Tokyo Corona Ltd 1994 263
- Yasui, Y. Secondary O 2 Feedback Using Prediction and Identification Type Sliding Mode Control SAE technical paper 2000-01-0936 April 2000
- Yasui, Y. Secondary O 2 Feedback Using Prediction and Identification Type Sliding Mode Control -- A Second Report SAE technical paper 2001-01-0264 March 2001
- Yasui, Y. Adaptive Sliding Mode Control for Secondary O 2 Feedback (Part 3) -- Improvement of Adaptability by the Use of Prediction and Identification Sliding Mode Control Honda R&D Technical Review 13 2 October 2001