25.73) developed by VDT.ĮCVT was first installed in Japan in February, 1987 on the Subaru Justy and has since been used on several other small vehicles, specifically the Nissan Micra with considerable success. Van Doorne steel thrust belt (Subaru).ĮCTV is consisted of an electromagnetic powder clutch and electronic control unit developed by Subaru, and steel thrust belt and pulleys (Fig. The Subaru ECVT, the world’s first practical electronically controlled CVT, was developed jointly by Fuji Heavy Industries in Japan (Subaru’s parent company) and VDT in Holland. Unfortunately, frictional losses in the transmission consume a considerable amount of energy and therefore in practice ECVT cars are about 5% less fuel efficient than their equivalent manual transmission counterparts. Theoretically, this should provide exceptional fuel economy if the engine is at the optimum speed and load point for a given road speed. ECVT cars are generally much faster from a standing start, than their manual counterparts.ĭuring running the ECVT offers a very wide ratio span, roughly equivalent to that of a six-speed manual transmission. When D is engaged the driver can accelerate away, with the transmission operating at the optimum ratio for the desired engine speed. ![]() The ECVT uses a selector lever very similar to that of a conventional automatic transmission. This gives a fuel saving of about 10% than a conventional four speed automatic transmission. Electronically Controlled Continuously Variable Transmission (ECVT)Īn interesting feature of the electronic control system is that it observes driver’s behavior and accordingly optimizes the interaction of the engine and transmission to provide best performance and economy.
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