(1) Automobile Engines in Theory, Design, Construction, Operation, Testing and Maintenance (2) The Testing of High - Speed Internal Combustion Engines: with Special Reference to Automobile and Aircraft Types and to the Testing of Automobiles (3) Cost of Power Production by Internal Combustion Engines

This paper presents a method for solving the dynamic response problems of a driven valve system and the stress problem of valve springs for internal combustion engines. In this system there is hysteresis behavior in the spring constants during the rotation of the cam shaft. To treat this nonlinearity, the rigidity of each section is assumed to be one of a partly linear spring. For the valve trains, the cam profile is complex in general. To treat a general cam profile, this paper applies a combination method of the Fourier expansion, the Laplace transform and the analytical connection methods, and gives a response of valve trains. This paper also presents a theoretical result for the stresses in the valve spring due to the motion of the valve train based on the three dimensional curved beam theory.

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High-speed Internal-combustion Engines

Nature ◽

10.1038/099124a0 ◽

1917 ◽

Vol 99 (2476) ◽

pp. 124-124

Keyword(s):

High Speed ◽

Internal Combustion Engines ◽

Internal Combustion ◽

Combustion Engines

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A zonal approach for estimating pressure ratio at compressor extreme off-design conditions

International Journal of Engine Research ◽

10.1177/1468087418754899 ◽

2018 ◽

Vol 20 (4) ◽

pp. 393-404 ◽

Cited By ~ 8

Author(s):

José Galindo ◽

Roberto Navarro ◽

Luis Miguel García-Cuevas ◽

Daniel Tarí ◽

Hadi Tartoussi ◽

...

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

High Speed ◽

Internal Combustion Engines ◽

Pressure Ratio ◽

Internal Combustion ◽

Operating Conditions ◽

Combustion Engines ◽

One Dimensional ◽

Performance Map

Zero-dimensional/one-dimensional computational fluid dynamics codes are used to simulate the performance of complete internal combustion engines. In such codes, the operation of a turbocharger compressor is usually addressed employing its performance map. However, simulation of engine transients may drive the compressor to work at operating conditions outside the region provided by the manufacturer map. Therefore, a method is required to extrapolate the performance map to extended off-design conditions. This work examines several extrapolating methods at the different off-design regions, namely, low-pressure ratio zone, low-speed zone and high-speed zone. The accuracy of the methods is assessed with the aid of compressor extreme off-design measurements. In this way, the best method is selected for each region and the manufacturer map is used in design conditions, resulting in a zonal extrapolating approach aiming to preserve accuracy. The transitions between extrapolated zones are corrected, avoiding discontinuities and instabilities.

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A Simple Combustion Efficiency Indicator for Automobile Engines

Measurement and Control ◽

10.1177/002029407300601001 ◽

1973 ◽

Vol 6 (10) ◽

pp. 399-400 ◽

Cited By ~ 1

Author(s):

M. S. Bolton ◽

D. S. Taylor

Keyword(s):

Carbon Monoxide ◽

Internal Combustion Engines ◽

Fuel Mixture ◽

Internal Combustion ◽

Combustion Efficiency ◽

Exhaust Emission ◽

Combustion Engines ◽

Widespread Application ◽

Mixture Ratio ◽

Automobile Engines

A cheap device which can indicate carbon monoxide levels in exhaust emission of internal combustion engines, and hence could be used for adjusting the engine's operating air: fuel mixture ratio, would have widespread application in garages, etc. The instrument described here is sensitive to both unburnt hydrocarbons and carbon monoxide but measures the carbon monoxide to an accuracy well within the tuning capability of most carburation systems.

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