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High Output Compound Diesel Engine Schemes - How do they Compare with State-of-the-Art Turbocharged Engines?
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Abstract
The paper is divided into two main parts.
In the first part, section 2 and 3, the performance of turbocharged and compounded systems based on a hypothetical 6 cylinder, 8 litre, 4 cycle DI Diesel engine is discussed under two subheadings:
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a)
the comparative performance, at rated conditions of 2200 rev/min of the two types of system operating at boost levels of 3 bar and 5 bar.
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b)
a much more detailed comparison of the two systems over the full speed range, at the same rated levels of boost, with the 3 bar system operating with a single stage turbocharger, and the 5 bar system with a 2 stage turbocharger.
In the second part, sections 4 and 5, the principle of the differential compound engine (DCE) as an integrated engine-transmission system is briefly described, followed by a comparative performance assessment of two alternative builds, both again using a 6 cylinder, 8 litre DI Diesel engine, in either 4 cycle or 2 cycle form, together with the results of a design study for a 1000 hp military engine.
In the concluding section 6 the outstanding torque-speed and transient performance characteristics of the DCE are set against the background of the inevitable compromises involved in using high pressure air not only as the working fluid for the engine, but also for the continuously variable transmission.
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Wallace, F., "High Output Compound Diesel Engine Schemes - How do they Compare with State-of-the-Art Turbocharged Engines?," SAE Technical Paper 952099, 1995, https://doi.org/10.4271/952099.Also In
References
- Brands, M.C. Werner, J.E. Hoehne, J.L. Kramer, S. “Vehicle Testing of Cummins Compound Diesel Engine” SAE paper 810073 1981
- Saab-Scania Sales brochure on Scania Turbocompound Engine 1991
- Wallace, F.J. “Operating characteristics of Compound Engine Schemes for Traction Purposes based on Opposed Piston 2 Stroke Engines with Differential Gearing” Proc. I.Mech.E. 173 2 1963
- Wallace, F.J. “The Differential Compound Engine” SAE paper 670110 1967
- Wallace F.J. Sivakumaran, K. “The Differential Compound Engine - Part 1: Steady State and Emission Characteristics” SAE paper 740721 1974
- Wallace, F.J. Hargreaves, M.R.Q. Bowns, D.E. Cave, P.R. “The Differential Compound Engine - Part 2 Transient Response of the DCE compared with conventional Turbocharged Engines” SAE paper 740722 1974
- Wallace, F.J. Prince, D. Howard, D Tarabad, M. “Design and Performance Characteristics of the Laboratory Differential Compound Engine at Bath University” I.Mech.E. Conference on Integrated Engine Transmission Systems 1986 paper C 196/86
- Wallace F.J. Howard D. Tarabad, M. “Design and Performance Studies for a 1000 HP Military Version of the Differential Compound Engine” I.Mech.E. Conference on Integrated Engine Transmission Systems 1986 paper C 194/86
- Wallace, F.J. Deqan Zou Rezaian, M. “Transient Response and Route Simultations for Heavy Vehicles with Alternative Engine Transmission Systems” SAE paper 890393 Detroit 1989
- Hall, J. Wallace, F.J. “Control Design for a Differential Compound Engine” SAE paper 890392 Detroit 1989