The hybrid version of the Toyota Sienta small minivan, which Toyota Motor Corp released July 9, 2015, is based on the system of the Aqua small hybrid vehicle (HEV).
On the other hand, Toyota employed a water-cooled motor and generator instead of air-cooled ones to improve efficiency and changed the location and thickness of the battery pack placed in the center of the vehicle to lower the height of the door aperture.
As in the case of the Aqua, the Toyota Sienta combines the "1NZ-FXE" 1.5L engine with a motor and generator.
The transaxle of the new Toyota Sienta consists of a motor, generator, planetary gear mechanism, reduction gears, etc. Toyota employed the water-cooled motor and generator to enhance cooling efficiency. Also, the company lowered the gear ratio of the differential gears in the aim of coping with the increase in mass because the new Toyota Sienta is a seven-seat vehicle.
In the Aqua, the battery pack is located under the rear seats. On the other ha
nd, the battery pack of the new Sienta extends to under the front seats so that the height of the rear door aperture is lowered to 330mm and even women and children can easily get in and out of the vehicle.Toyota reduced the thickness of the battery pack by about 3cm. Though the company used the same cell, it reduced the size of the air passageway used for cooling. A large-capacity, high-pressure-loss blower was employed to keep cooling performance despite the narrower air passageway.
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