Abstract

A V6 i-VTEC engine provided with a variable cylinder system has been developed to achieve high output, high fuel economy and low emissions. The variable cylinder system uses the VTEC mechanism to close the rear bank of three cylinders. To increase the accuracy of switching control, it is essential to increase the responsiveness of switching when oil pressure is low at low engine speeds. High responsiveness has been ensured in this engine by contriving the way of switching synchro pin and spool valves. The increased accuracy of control has enabled valve close timing to be synchronized with the stopping of fuel supply to the deactivated cylinder bank. As a result, the system is able to switch instantaneously between three- and six-cylinder operation to enable engine output to respond to the different driving conditions with no loss of drivability. The new engine has been employed in the new model INSPIRE. It is a high-power (184 kW [250 ps]) and high-torque (296 Nm [30.2 kgm]) engine, and achieves a fuel consumption of 11.6 km/l in Japanese 10-15 mode and meets ultra-low emissions standards while maintaining regular gasoline specifications.

References

1. (1) Matsuki M. et al.: Development of a Lean Burn Engine with a Variable Valve Timing Mechanism, SAE Paper 960583
2. (2) Matsuoka, H., Mikasa, T., Nemoto, H.: Development of Active Control Engine mount, Honda R&D Technical Review, Vol. 15, NO. 2, p. 209-214 (2003)
3. (3) Inoue, T., Takahashi, A., Minowa, S., Sano, H.: Development of Active Noise Control System for Engine Booming Noise, Honda R&D Technical Review, Vol. 15, No. 2, p. 201-208 (2003)

Author (organization or company)

• Katsumi NOGUCHI（Tochigi R&D Center）
• Mikio FUJIWARA（Tochigi R&D Center）
• Makoto SEGAWA（Tochigi R&D Center）
• Kazutomo SAWAMURA（Tochigi R&D Center）
• Shigeru SUZUKI（Tochigi R&D Center）

Publication Information

Article of Honda R&D Technical Review Vol.16 No.1 (85 - 92)

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Citation Information