1. Home
  2. Honda R&D Technical Review Vol.16 N...
  3. Study on Variable Valve Timing Syst...

Technical Review e-Book: Summary

Study on Variable Valve Timing System Using Electromagnetic Mechanism

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


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.


(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)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Development of V8 Engine for American Le Mans Series
Article of Honda R&D Technical Review Vol.19 No.2
Development of 1.8L i-VTEC Gasoline Engine for 2006 Model Year Honda CIVIC
Article of Honda R&D Technical Review Vol.18 No.1
Development of i-VTEC Gasoline Engine for 2008 Model Year Honda FIT
Article of Honda R&D Technical Review Vol.20 No.1