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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 311 to 320 of 29886 (0.1 seconds)| 311 |
Control of spark ignition engines using in-cylinder ionisation sensorsHands, T. January 1987 (has links)
This thesis is concerned with the potential applications for in-cylinder ionisation probes for the feedback control of spark ignition engines. Such sensors are shown to yield useful qualitative information about the combustion process. Two different implementations of an in-cylinder ionisation probe are investigated - both types are demonstrated to have potential for specific control applications. The first implementation is a <i>Flame front sensor</i> - here an ionisation probe is used to determine the time of flame arrival at a position remote from the spark plug. This parameter is typically subject to a high degree of cyclic variability, but is generally sensitive to variables which affect the flame speed such as air/fuel ratio, turbulence characteristics etc. The flame arrival time is shown to be useful as an indicator of relative cylinder to cylinder variations. The general signal characteristics were determined for a range of engine conditions and a system for the real-time, feedback control of a fuel injection system was developed and demonstrated. Results showed that, with the controller implemented on a four cylinder engine, the lean misfire limit could be extended to higher air/fuel ratios and the brake specific fuel consumption was improved. The second implementation of a <i>Post-flame ionisation sensor</i> -- the residual ionisation in the burnt gases behind a flame front is used to provide a signal which is sensitive to cylinder temperature and pressure. The central electrode of the spark plug is conveniently located to produce such a signal -- providing precautions are taken to protect the signal circuitry from the high voltage ignition spark. The signal characteristics of the spark plug ionisation probe were evaluated. Applications of the signal to the feedback control of ignition timing and/or fuelling, based on the estimation of peak cylinder pressure arrival and knock intensity, are demonstrated.
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Concurrent engineering : a team-based approach to rapid implementationLettice, Fiona E. January 1995 (has links)
No description available.
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Valve design optimisation for a 3-cylinder semi-hermetic reciprocating refrigeration compressorBoyle, R. J. January 1985 (has links)
No description available.
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Achievement in education : improving measurement and testing models and predictorsMcIlroy, David January 2000 (has links)
No description available.
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The quasi static and dynamic behaviour of robot near the workNowrouzi, Ardeshir January 1990 (has links)
No description available.
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Adaptive distance relaying scheme for the protection of Teed circuitsTeliani, Mohamad January 1991 (has links)
No description available.
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Instructional multimedia : comparison and enhancement of expert evaluation methodsDimitrova, Maia Tzokova January 2002 (has links)
No description available.
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The light scattering characteristics of the normal and contact lens-wearing eyeHennelly, Michelle Louise January 2000 (has links)
No description available.
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An examination of the relationship between the personality and cognitive style of a manager and the tasks he/she chooses to performSmith, E. J. January 1988 (has links)
No description available.
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Aspects of visual processing in relation to search performanceForsyth, P. M. January 1987 (has links)
No description available.
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