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Study on Variable Valve Timing System Using Electromagnetic Mechanism

Article of Honda R&D Technical Review Vol.16 No.2

Summary

The elimination of the throttle has recently attracted attention as a means of improving fuel economy through the reduction of pumping loss. The research described in this paper concerned fuel economy, noise and vibration performance and wide-open throttle performance in an engine equipped with an electromagnetic variable valve timing mechanism to enable the throttle to be eliminated.
A high-efficiency mechanism equipped with a low voltage drive method from considerations of practical use and constant voltage opening and closing control that has realized short and stable valve contact speed were developed. In comparison with a conventional cam-driven valvetrain, this new valve mechanism has achieved a simulation-based improvement of 7% in fuel economy in the 10.15 mode and a roughly 20% increase in torque at low to mid engine speeds through optimization of valve timing and scavenging effectiveness. In addition, the combination of compact type-integrated hydraulic tappet, dual over-excitation constant voltage control and resin engine cover, has enabled the engine to record the same noise level when idling as an engine with a conventional valvetrain.

Reference

(1) Tuttle, J.: Controlling Engine Load by Means of Late Intake Valve Closing, SAE Paper 800794
(2) Tuttle, J.: Controlling Engine Load by Means of Early Intake Valve Closing, SAE Paper 820408
(3) Gray, C.: A Review of variable engine valve timing, SAE Paper 880386
(4) Nuccio, P.: Variable Valve Timing as a Means to Control Engine Load, FISITA 82071
(5) Lenz, H.: Initial test result of an electro-hydraulic variable-valve actuation system of a firing test, SAE
Paper 890678
(6) Suzuki, J.: Study of improving Fuel Economy by Early Intake Valve Closing Concept, Transaction of the SAE of JAPAN, No. 24 (1982)
(7) Urata, Y.: A Study of Vehicle Equipped with Non- Throttling S. I. Engine with Early Intake Valve Closing Mechanism, SAE Paper 930820

Author (organization or company)

Chihaya SUGIMOTO(Tochigi R&D Center)、Atsushi UMEMOTO(Tochigi R&D Center)、Yasuo SHIMIZU(Tochigi R&D Center)

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