Method of Predicting Some Aspects of Performance of a Diesel Engine Using a Digital Computer

Abstract

While the design of diesel engines is necessarily based upon some estimate of the pressure and temperature conditions expected in the cylinder and in the air and exhaust manifolds, such estimates have usually been very approximate. The suitability of the design has to be proved, or improved, during a considerable programme of rigorous development.As engines become more highly rated the value of more accurate early estimates of engine performance, as a guide to the designer, becomes more obvious. The paper describes a method of calculating t h i s information by digital computer based on a fundamental approach to the processes involved. It is demonstrated that the cylinder pressures and temperatures, exhaust gas temperatures, fuel consumption, air flow, heat losses, piston and wall temperatures and engine output so calculated, correlate very well with experimental results.Using this technique, Merent combinations of engine variables can be 'tested' by computation to reduce the range of engine tests necessary to develop the optimum design, and allow the designer and the development engineer to concentrate their practical experience and technical 'know-how' on the formidable problems of mechanical development and combustion improvement.

Some Problems in Diesel Engine Research with Special Reference to Computer Control and Data Acquisition

“…I feel it is a deficiency of the paper that no reference was made to the seminal work of Whitehouse et al (15) or the more recent paper by Benson and Pick (16). Both of these references include a detailed investigation of the effect of transducer and acquisition system errors.…”

“…15 and 16 are based on cumulative heat release diagrams. We have tried to show that this is an insensitive parameter and that comparisons should be based on the rare of heat release.…”

The Application of Modern Control Theory to a Turbocharged Diesel Engine Powerplant

“…The filling-and-emptying model was originally proposed by Janota et al (16) and Whitehouse et al (17) as a means of obtaining more representative predictions of the performance of turbocharged engines. The steadystate models were extended by Watson and Marzouk (18) and Winterbone et al (19) to predict the per- showed that for medium-and high-speed diesel engines the intermittent nature of combustion was not very important and the transfer function could be described in the s-plane rather than the z-plane which is more conventional for sampled-data systems.…”