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Research on ISG Belt Drive System for Idling Stop System

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


To enable a belt-drive Integrated Starter Generator (ISG) to be used in an idle stop system, the belt system must be capable of both driving the accessories and starting the engine. Accomplishing this with a conventional belt system required an increase in the tension of the belt, which also increased friction losses and is thus incompatible with the intention of increasing fuel economy.
Testing quantified the effect of the increased belt tension on increasing friction losses. With this knowledge the research team focused on the auto-tensioner mechanism and the design of a superior belt system without the requirement for an increase in tension. Belt tension was reduced through the employment of an auto-tensioner in which contraction can be controlled by exploiting the incompressibility of fluid and by modifying the belt layout to enable optimal positioning of the new auto-tensioner. The use of reverse torque was tested and proven to be an effective method of further reducing the tension of the belt. The combination of these innovations has resulted in the development of a superior belt system well matched to the requirements of an idle stop system.


(1) JP, 2001-107827, A (2001)
(2) JP, 11-190223, A (1999)
(3) Arnold, M., El-Mahmoud, M.: A Belt-Driven Starter-Generator Concept for a 4-Cylinder Gasoline Engine, Auto Technology, Vol. 3, p. 64-67 (2003)
(4) Toyota Motor Corporation: Electronic Engineering Manual, Estima Hybrid (2001)
(5) Tanei, K., Ohori, M., Yano, Y., Ezoe, T.: Development of a Belt-driven Engine Starting System, Society of Automotive Engineers of Japan, Inc., Spring 2002 Annual Congress Proceedings, No. 1-02, p. 9-12 (2002)

Author (organization or company)

Kazuma OKUDA(Tochigi R&D Center)、Yasuyuki KOMATSU(Tochigi R&D Center)、Shigeru AOKI(Tochigi R&D Center)、Tadashi FUJIWARA(Tochigi R&D Center)、Youichi NAKAHARA(Tochigi R&D Center)

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