DIGITAL SIMULATION OF A CVT HYDRAULIC CONTROL SYSTEM
The design and calibration of conventional 3- or 4 speed automatic transmission control systems is carried out in most cases according to static hydraulic aspects. These systems work digital by opening or closing "YES/NO" type shift valves to change the ratio. Continuously variable transmissions (CVT) need a control system that continuously changes the ratio by regulating a "ratio control valve". Due to the complex structure and closed loops incorporated in CVT hydraulic control system, there is an increasing demand on adequate development aids like computer simulation systems. Especially for intensive analysis of the dynamic behaviour and determination of influencing parameters such an engineering tool can be very helpful. The objective of this presentation is to show the application of a computer program system that describes the dynamic behaviour of a CVT hydraulic control system and the potential improvements of this system by means of simulation. For the purpose of demonstration, the hydraulic control system of a Ford CVT, called CTX, using the Van Doorne's steel belt principle, will be discussed. The used computer program DSH was developed by the "Institute for Hydraulic and Pneumatic (IHP)" of the Technical Highschool Aachen.
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Supplemental Notes:
- ISATA 84, "In Pursuit of Technical Excellence". Proceedings Volume 1. International Symposium on Automotive Technology and Automation with particular reference to Vehicle Management Systems and Flexible Manufacturing Systems, Milan, Italy 24-28 September 1984.
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Corporate Authors:
Automotive Automotion Limited
42 Lloyd Park Avenue
Croydon CRO 5SB, Surrey, EnglandAlfa Romeo Auto SpA
Milan, Italy -
Authors:
- Staffel, H
- Conference:
- Publication Date: 1984
Media Info
- Features: Figures;
- Pagination: p. 51-70
Subject/Index Terms
- TRT Terms: Automatic transmissions; Continuously variable transmissions; Control systems; Digital computers; Dynamics; Hydraulic equipment; Simulation
- Uncontrolled Terms: Digital techniques; Dynamic characteristics
- Old TRIS Terms: Hydraulic systems
- Subject Areas: Safety and Human Factors;
Filing Info
- Accession Number: 00399881
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: ISATA 84004, HS-038 422
- Files: HSL, USDOT
- Created Date: Oct 31 1985 12:00AM