Download Automotive Engine Alternatives by Charles A. Amann (auth.), Robert L. Evans (eds.) PDF

By Charles A. Amann (auth.), Robert L. Evans (eds.)

This ebook comprises the complaints of the foreign Symposium on substitute and complex car Engines, held in Vancouver, B.C., on August eleven and 12, 1986. The symposium was once backed by means of EXPO 86 and The college of British Columbia, and was once a part of the really expert sessions software of EXPO 86, the 1986 world's reasonable held in Vancouver. a few eighty attendees have been drawn from eleven nations, representing the educational, vehicle­ reason and big engine groups. the aim of the symposium was once to supply a severe evaluate of the foremost choices to the inner combustion engine. The scope of the symposium used to be restricted to attention of combustion engines, in order that electrical energy, for instance, was once no longer thought of. This used to be no longer a reflec­ tion at the attainable contribution which electrical propulsion may perhaps make sooner or later, yet quite an try and concentration the complaints extra sharply than if all attainable propulsion structures have been thought of. during this method all the members have been capable of perform the occasionally full of life dialogue classes following the presentation of every paper.

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Extra resources for Automotive Engine Alternatives

Sample text

It is usual in a high-speed engine for the exhaust-closing and intake-opening events to overlap considerably near top dead center between the exhaust and intake strokes. When an engine with this cam timing is run at low speeds and light loads, a high residual fraction is retained in the cylinder at intake-valve closing. This dilution can contribute to excessive combustion variability that is correctable with low valve overlap. However, with the low overlap, highspeed performance suffers. To resolve this conflict, a passive variablevalve-overlap lifter has been demonstrated that changes overlap as a function of engine speed [25] .

This allows the piston to expel part of the inducted mixture back into the intake manifold until compression actually begins. With EIVC, the throttle is held open while load is decreased by closing the intake valve progressively earlier during the intake stroke [28]. The trapped mass is then expanded during the latter part of the intake stroke and recompressed on the succeeding compression stroke. In the comparison conducted, EIVC was judged superior to LIVC for improving fuel economy, with the gain amounting to less than 10% and being sensitive to any increase in friction incurred from the valve mechanism.

25. TIM ING Interaction between mixture distribution and spark timing. to the appropriate value in each cylinder individually. Two approaches for extracting the needed signals from the cylinders have been advanced. One is based on the measurement of cylinder pressure. The other detects flame arrival at the far end of the combustion chamber by means of an ion probe installed in each cylinder. These techniques also show promise of measuring mixture dilution. With individual-port fuel injection, this would facilitate closed- loop control of mixture strength in each cylinder.

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