Modelling and simulation of a dual-clutch transmission vehicle to analyse the effect of pump selection on fuel economy
- 1 July 2010
- journal article
- research article
- Published by Taylor & Francis Ltd in Vehicle System Dynamics
- Vol. 48 (7), 851-868
- https://doi.org/10.1080/00423110903177042
Abstract
Positive displacement pumps are used in automotive transmissions to provide pressurised fluid to various hydraulic components in the transmission and also lubricate the mechanical components. The output flow of these pumps increases with pump/transmission speed, almost linearly, but the transmission flow requirements often saturate at higher speeds, resulting in excess flow capacity that must be wasted by allowing it to drain back to the sump. This represents a parasitic loss in the transmission leading to a loss in fuel economy. To overcome this issue, variable displacement pumps have been used in the transmission, where the output flow can be reduced by controlling the displacement of the pump. The use of these pumps in automatic transmissions has resulted in better fuel economy as compared with some types of fixed displacement pumps. However, the literature does not fully explore the benefits of variable displacement pumps to a specific type of transmission namely, dual-clutch transmission (DCT), which has different pressure and flow requirements from an epicyclic gear train. This paper presents an analysis of the effect of pump selection on fuel economy in a five-speed DCT of a commercial vehicle. Models of the engine, transmission, and vehicle are developed along with the models of two different types of pumps: a fixed displacement gerotor pump and a variable displacement vane pump. The models are then parameterised using experimental data, and the fuel economy of the vehicle is simulated on a standard driving cycle. The results suggest that the fuel economy benefit obtained by the use of the variable displacement pump in DCTs is comparable to the benefit previously shown for these pumps in automatic transmissions.Keywords
This publication has 15 references indexed in Scilit:
- Flow characteristics of a trochoidal-gear pump using bond graphs and experimental measurement. Part 1Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2007
- Shift dynamics and control of dual-clutch transmissionsMechanism and Machine Theory, 2007
- Identification and Modeling of Electrohydraulic Force Control of the Material Test System (MTS)Journal of Physics: Conference Series, 2006
- Fixed causality slip-stick friction models for use in simulation of non-linear systemsProceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2005
- Dynamic Modeling and Simulation of a Dual-Clutch Automated Lay-Shaft TransmissionJournal of Mechanical Design, 2005
- A survey of models, analysis tools and compensation methods for the control of machines with frictionAutomatica, 1994
- Modeling of a Hydraulic Energy Regeneration System: Part I—Analytical TreatmentJournal of Dynamic Systems, Measurement, and Control, 1992
- Stability and Regulation of a Variable-Displacement Vane-PumpJournal of Dynamic Systems, Measurement, and Control, 1988
- Modeling and Analysis of the Dynamics of a Variable-Displacement Vane-Pump With a Pivoting CamJournal of Dynamic Systems, Measurement, and Control, 1988
- The Mathematical Modelling of Hydrostatic Pumps and MotorsProceedings of the Institution of Mechanical Engineers, Part B: Management and engineering manufacture, 1984