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Development of V6 Engine with New Variable Cylinder Management

Article of Honda R&D Technical Review Vol.20 No.1


A new V6 3.5-L i-VTEC variable cylinder management (VCM) engine was developed with the goals of high output, low fuel consumption, and low exhaust emissions. This engine employs a cylinder deactivation mechanism that uses variable valve timing and lift electric control (VTEC) that enable operation with three, four, or six cylinders according to operating conditions. With the addition of 4-cylinder operation, this realizes three-mode control over the number of cylinders, one mode more than previous cylinder deactivation engines. The increase in the number of cylinder deactivation modes was combined with the new development of hydraulic circuits, a hydraulic switching mechanism, and switching control. This has enabled the instantaneous switching of operating cylinders without losses of drivability, as in previous models. This engine is being installed in the new model ACCORD, giving this vehicle output and fuel economy at the top of its class, and at the same time complying with Partial Zero Emission Vehicle (PZEV) regulations in the U.S. state of California.


(1) Noguchi, K., Fujiwara, M., Segawa, M., Sawamura, K., Suzuki, S.: Development of V6 i-VTEC Engine with Variable Cylinder Management, Honda R&D Technical Review, Vol. 16, No. 1, p. 85-92

Author (organization or company)

Makoto SEGAWA(Automobile R&D Center)、Kazuhide KUMAGAI(Automobile R&D Center)、Ryuuji SATO(Automobile R&D Center)、Yuuichi TAMURA(Automobile R&D Center)、Mikio FUJIWARA(Automobile R&D Center)

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