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Hydro-Mechanical Transmission Implements Regenerative Braking for the Postal LLV Trucks and a Hydraulic Hybrid Passenger Vehicle at a Lower Cost than a Conventional Vehicle
Technical Paper
2015-01-1096
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The frequent stops of the typical postal delivery vehicle make it an attractive application for regenerative braking. The hydro-mechanical automatic transmission described in SAE paper 2014-01-1717 contains all the functions necessary to implement hydraulic regenerative braking including the accumulator and reservoir. This paper describes the substitution of the hydro-mechanical transmission for the present transmission of the postal LLV vehicles and estimates the performance benefits. The result represents a low impact path for the US Postal Service to extend the useful life of the LLV vehicles and increase the mpg by approx. 100%.
A cost comparison between a convention ICE mid-sized passenger sedan and a similar size gas/hydraulic hybrid vehicle illustrates the cost advantage of the hydraulic approach using the new transmission design. Besides lower cost, the vehicle will have greater initial acceleration and 25%+ better mpg. Hydraulic regenerative braking has twice the overall efficiency of energy recovery and greater startup torque than electric regenerative braking. Its ability to handle higher peaks of braking energy, means more of the braking energy can be captured than with the electric systems.
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Lloyd, R., "Hydro-Mechanical Transmission Implements Regenerative Braking for the Postal LLV Trucks and a Hydraulic Hybrid Passenger Vehicle at a Lower Cost than a Conventional Vehicle," SAE Technical Paper 2015-01-1096, 2015, https://doi.org/10.4271/2015-01-1096.Also In
References
- GAO Report to Congressional Requesters UNITED STATES POSTAL SERVICE, “ Strategy Needed to Address Aging Delivery Fleet ”, GAO report GAO-11- 386 20 22 40 May 2011
- Progress Report on Clean and Efficient Automotive Technologies under Development at EPA Interim Technical Report. EPA420-R-04-002 January 2004
- Lloyd , R. High Efficiency, Hydro-Mechanical Passenger Vehicle Transmission using Fixed Displacement Pump/Motors and Digital Hydraulics SAE Int. J. Passeng. Cars - Mech. Syst. 5 2 833 855 2012 10.4271/2012-01-0624
- Lloyd , R. Quasi-Continuously-Variable Transmission Provides Hydraulic Regenerative Braking for Passenger Cars, Trucks, and Buses SAE Technical Paper 2014-01-1717 2014 10.4271/2014-01-1717
- Press release. Automotive World Citroen Hybrid Air Technology takes Center Stage at Geneva Motor Show Feb. 16 2013
- Grey Charles L. , Director, Advanced Technology Division, Office of Transportation and Air Quality, US EPA Hydraulic Hybrids, EPA Hybrid Truck Initiative HARC Texas Slide 13 October 17 2006
- Comparing the Benefits and Impacts of Hybrid Electric Vehicle Options EPRI (Electric Power Research Institute) Palo Alto, CA 2001 1000349
- Steelhead Composites Golden, CO
- Bucher Hydraulic Klettgau-Griessen Germany