This project studied the results of previous research on the potential effects of variable valve timing for improving automotive engine fuel economy. Methods of implementation of valve timing control and their practicality were also assessed. Some of the sources claim fuel economy improvements as high as 18 to 20 % but conclusions suffler from insufficient test data as well as a recording of major variables. Other deficiencies include insufficient attention to effects on driveability; lack of standard reference for data comparisons; and little consideration toward manufacturing feasibility. It is concluded that savings of 5 to 10 % over the normal drive cycle are probably realizable providing emphasis is directed towards optimizing valve timing schedules at low speeds under low loads as opposed to the current practice of wide open throttle. Methods if implementation as reported from research programs and patent disclosures were also evaluated, categorized and assessed for manufacturing practicability.
The assessment of variable valve timing of internal combustion engines for fuel economy improvements and practicability
Bewertung der zeitvariablen Motorsteuerung bei Brennkraftmaschinen als Instrument der Energieeinsparung: Durchfuehrbarkeit
US Government Reports ; Dez
1981
71 Seiten
Report
English
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