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Development of a Braking Energy Regeneration System for City Buses
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English
Abstract
In order to improve the fuel economy of city buses, which start and stop frequently, a system has been developed that stores braking energy in a hydraulic accumulator and uses the energy when the vehicle is in its start and acceleration modes.
Through microcomputer control of the entire power train and energy storage system, the following goals are achieved:
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1.
By applying currently available transmission technologies to the conventional power train system, all component functions are controlled so as to minimize the losses over the driving cycle.
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By applying a regenerative braking system, as much vehicle kinetic energy as possible is recovered and stored, and,
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3.
The energy stored is used so as to achieve maximum overall efficiency.
A test vehicle functioning in city conditions achieved a 30% fuel economy gain.
Other advantages of this system are that brake wear is greatly reduced and clutch life is significantly extended since the vehicle can start in motion using only hydraulic energy.
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Authors
- Norio Nakazawa - Truck & Bus Engineering Center, Mitsubishi Motors Corp., Japan
- Yoichiro Kono - Truck & Bus Engineering Center, Mitsubishi Motors Corp., Japan
- Eijiro Takao - Truck & Bus Engineering Center, Mitsubishi Motors Corp., Japan
- Nobuaki Takeda - Truck & Bus Engineering Center, Mitsubishi Motors Corp., Japan
Topic
Citation
Nakazawa, N., Kono, Y., Takao, E., and Takeda, N., "Development of a Braking Energy Regeneration System for City Buses," SAE Technical Paper 872265, 1987, https://doi.org/10.4271/872265.Also In
SAE 1987 Transactions: Reciprocating Engines--Spark Ignition and Diesel
Number: V96-4; Published: 1988-09-01
Number: V96-4; Published: 1988-09-01
References
- Frank A.A. Beachley N.H. “Design Considerations for Flywheel-Transmission Automobiles,” SAE paper 800886
- Buchwald P. Christensen G. Larsen H. Pedersen P. Sunn “Improvement of Citybus Fuel Economy Using a Hydraulic Hybrid Propulsion System - A Theoretical and Experimental Study,” SAE paper 790305
- Evans P.A. Karlsson Arne “The Volvo City Bus,” IMechE paper C157/81 1981
- Booz-Allen & Hamilton Inc. “Investigation of the Applicability of a Stored Hydraulic Energy Propulsion system to a Conventional Bus,” Report to the Tri-County Metropolitan Transportation District of Oregon August 1981
- Frank A.A. Beachley N.H. “Flywheel/Heat Engine Vehicle Design and Analysis,” the Annual Mechanical, Magnetic and Underground Energy Storage Contractor's Review Washington, D.C. November 10-13 1980
- Frank A.A. Beachley N.H. “Practical Considerations for Energy-Storage Motor Vehicles,” IECEC Atlanta, Ga. August 1981
- Beachley N.H. Frank A.A. Jamzadeh F. Nohr M.W. Volz T.A. “Continuously-Variable Transmission Designs for Flywheel Hybrid Automobiles,” Tokyo Conference Japan Society of Mechanical Engineers 1981
- Beachley N.H. “Comparison of Accumulator and Flywheel Energy Storage for Motor Vehicle Applications” SAE paper 859136