Improvement of Citybus Fuel Economy Using a Hydraulic Hybrid Propulsion System - A Theoretical and Experimental Study 790305
The paper describes the application of a hydraulic pump/motor and a hydro-pneumatic energy-storage as a supplement to the conventional internal combustion engine in a city bus.
The resultant hybrid-system makes it possible to smooth out the combustion engine power output and to regenerate the braking-energy which in conventional busses dissipate as heat.
Computer-simulation and supplementary experiments with a model-system have shown that, depending on the driving pattern of the bus, this type of hybrid-system would lead to a 10 - 30% fuel saving provided that an appropriate control strategy is used.
Citation: Buchwald, P., Christensen, G., Larsen, H., and Sunn Pedersen, P., "Improvement of Citybus Fuel Economy Using a Hydraulic Hybrid Propulsion System - A Theoretical and Experimental Study," SAE Technical Paper 790305, 1979, https://doi.org/10.4271/790305. Download Citation
P. Buchwald, G. Christensen, H. Larsen, P. Sunn Pedersen
Technical Univ. of Denmark, Laboratory for Energetics
1979 Automotive Engineering Congress and Exposition