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Accession number;06A0236526
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| Title;Achievement of Enhanced Fuel Economy via i-VTEC Intake Valve Closure Delay Mechanism |
| Author;
SEKO KAZUYUKI
(Honda R & D Co., Ltd.)
HAYASHI ARUTO
(Honda R & D Co., Ltd.)
NAKAJIMA MASAHIRO
(Honda R & D Co., Ltd.)
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Journal Title;Honda R&D Tech Rev
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Journal Code:L0353A
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ISSN:0915-3918
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VOL.18;NO.1;PAGE.88-93(2006)
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| Figure&Table&Reference;FIG.11, TBL.1, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The conventional VTEC system has been modified with a mechanism enabling delayed closure of the intake valves as a new method of increasing fuel economy. The major characteristic of the new engine is the achievement of a balance between low fuel consumption and high power by means of switching between a delayed closure cam with delayed intake valve closure timing and a high output cam, depending on engine load. The intake valve closure delay mechanism employs the delayed closure cam when the engine is under low load in order to reduce pumping loss. The high output cam is employed when the engine is under high load, in order to produce high power. A variety of driving conditions were considered and in-cylinder flow simulations were used in setting the valve timing of the delayed closure cam. The delayed closure cam achieves a 6% reduction in engine fuel consumption compared to the high output cam. The application of the new VTEC mechanism has enabled the achievement of 17.0 km/L fuel economy in the Japanese 10-15 mode, representing a 5% increase on the level as stipulated by domestic 2010 fuel economy standards. (author abst.) |
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