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Optimization of Gearbox Ratios Using Techniques for Dynamic Systems
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Abstract
The objective of this paper is to demonstrate a possibility of optimizing the fixed gear ratios of an automatic transmission by using a special modeling and simulation technique. It is a problem to design the set of ratios in general, and especially for transient driving situations. Sometimes there is a lack of systematic methods to optimize dynamic systems, and particularly vehicle powertrain systems, which is the focus of this paper.
The techniques used involve a dynamic engine model and a refined gearbox model. To give each set of ratios a fair judgement, the gearbox control system is calibrated for each new set. The influence of a set of ratios on the vehicle acceleration performance and fuel economy in a given driving cycle is evaluated against an optimization criterion. Calibration of the gearbox control system is performed with stationary analysis. This is the most suitable way with respect to the input signals of gearbox control systems of today. On the other hand, the driving cycle simulation is dynamic, to achieve the desired accuracy.
Traditionally, the set of ratios is designed considering only stationary analysis. The proposed method using dynamic analysis gives better gearbox optimization, for the desired transportation task. Design recommendations can be made by following the procedure presented.
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Jacobson, B. and Berglund, S., "Optimization of Gearbox Ratios Using Techniques for Dynamic Systems," SAE Technical Paper 952604, 1995, https://doi.org/10.4271/952604.Also In
References
- Förster H J. Getriebschaltung ohne Zugkraftunterbrechung 60 76 October 1962
- Jacobson B. Gear Shifting with Retained Power Transfer Machine and Vehicle Design, Chalmers University of Technology Göteborg, Sweden 1993
- Berglund S. A Model of Turbocharged Engines as Dynamic Drivetrain Members SAE Paper No. 933050 (SAE Transactions) 1993
- Berglund S. Comparison between Measured and Simulated Transients of a Turbocharged Diesel Engine SAE Paper No. 942323 1994
- Woschni G. Längdynamiksimulation von Kraftfahrzeugen mit dieselmotorischem Antrieb 206 211 1995
- Weeks R W Moskwa J J. Automotive Engine Modeling for Real-Time Control using MATLAB/SIMULINK Modular Systems Inc. SAE 950414 1995
- The MathWorks SIMULINK Dynamic System Simulation Software - Users Guide Natick, Mass, USA 1992
- Pfeiffer K Isermann R. Driver Simulation used in Dynamical Engine Test Stands for Exhaust Emission Test Cycles Proceedings of the American Control Conference June 1993 721 725 San Fransisco, CA, USA 1993
- Box G.E.P. Hunter W.G. Hunter J.S. Statistics for Experimenters John Wiley & Sons N.Y., USA 1978