This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Automobile Fuel Economy with Hydromechanical Transmission by Simulation Studies
Annotation ability available
Sector:
Language:
English
Abstract
In order to achieve greater fuel economy, it is desirable to operate the engine on a prescribed schedule of rpm and bmep for each load condition. To accomplish this, a continuously variable transmission is used to establish the proper ratio for each horsepower requirement, and this ratio has to vary continuously with variation of load imposed on the engine. A simulation study is made to show the fuel economy achieved with a hydromechanical transmission, as compared to a conventional automatic transmission. For comparison, both engine-transmission combinations were studied over identical city and suburban driving cycles, taking into account the losses in the transmissions, as well as the inertia of the components during acceleration and deceleration. The hydromechanical transmission is used in this study, because it presents a near-term solution to the fuel economy problems. All of the parts that make up such a transmission are well-known state-of-the art components, thereby considerably reducing the required development time.
Authors
Topic
Citation
Orshansky, E., Huntley, P., and Weseloh, W., "Automobile Fuel Economy with Hydromechanical Transmission by Simulation Studies," SAE Technical Paper 740308, 1974, https://doi.org/10.4271/740308.Also In
References
- Hwang David N. “Fundamental Parameters of Vehicle Fuel Economy and Acceleration.” SAE Transactions 78 1969 paper 690541
- Waters William C. “General Purpose Automotive Vehicle Performance and Economy Simulator.” SAE Transactions 82 1972 paper 720043
- General Electric Space Division “Final Report Automobile Gas Turbine-Optimum Cycle Selection Study.” Section 3.6, “Mission Analysis,” EPA Contract No 68-01-0406 June 1972
- Orshansky Eli Weseloh William E. “Characteristics of Multiple Range Hydromechanical Transmissions.” SAE Transactions 81 1972 paper 720724
- Wadman Bruce “Responder Automatic Transmission Ready for Market.” Diesel and Gas Turbine Progress June 1973
- Sundstrand Corp. “Transmission Study.” Advanced Automotive Power Systems Contractors Coordination Meeting EPA December 1972
- Mechanical Technology Inc. “Transmission Study.” Advanced Automotive Power Systems Contractors Coordination Meeting EPA December 1972
- Tipping Roderick G. “Coaxial Hydromechanical Transmission.” August 1973 General Motors Corp.
- The Garrett Corp. “Gas Turbine Engine Optimization Studies.” Third Summary Report Automotive Power Systems Contractors Coordination Meeting, AAPS EPA June 22-23 1972
- Austin Thomas C. Hellman Karl H. “Passenger Car Fuel-Economy Treads and Influencing Factors.” Paper 730790 SAE National Combined Farm, Construction & Industrial Machinery and Fuels and Lubricants Meetings Milwaukee September 1973
- Huebner, G. J. Jr. Gasser Donald J. “Energy and the Automobile-General Factors Affecting Vehicle Fuel Consumption.” Paper 730518 SAE National Automobile Engineering Meeting Detroit May 1973
- “Where Does All the Power Go?” Symposium, SAE Journal April 1957