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Development of V6 ACCORD Hybrid 5 Speed Automatic Transmission System

Article of Honda R&D Technical Review Vol.17 No.2

Summary

The 5-speed automatic transmission employed in the 2005 model year V6 Accord Hybrid was developed to enable the vehicle to display the powerful and refined driving performance of a V6 sedan, while achieving the fuel economy of a 4-cylinder compact sedan.
The Accord Hybrid represents the first combination of an IMA system and a stepped AT employing a torque converter. While its overall length has been reduced, the new AT has been designed with consideration of the high torque generated by the V6 3.0L i-VTEC engine and the IMA motor.
Expansion of the cylinder idling operating range and more effective regeneration of deceleration energy required a redesigned long torsion damper and a highly responsive lock-up clutch mechanism. The system has also been equipped with an electronic oil pump to enable smooth takeoff after idle stop, and a hydraulic system that employs a linear solenoid for direct control of all shift stages. The use of these new technologies has enabled the achievement of a superb balance of fuel economy and driving performance.

Reference

(1) Kaizuka, M., Imai, T., Ishikawa, S., Niki, M., Adachi, H.: Development of 2005 Model Year ACCORD Hybrid System, Honda R&D Technical review, Vol. 17, No. 1, p. 18-24
(2) 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)

Shunsuke YOSHIDA(Tochigi R&D Center)、Toshitaka IMAI(Tochigi R&D Center)、Koichi FUSHIMI(Tochigi R&D Center)、Toshiaki MAEDA(Tochigi R&D Center)

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