Nissan Motor Company Limited

Toshiya Sakai

Kenichiro Murakami

Daigo Kishi

Yasuyoshi Yoda

Ryutaro Kunimasa

When an operating point that is determined by the engine speed (Ne), the engine torque (Te), and the vehicle speed falls within the zones of both a first vibration risk region (&#x3b1;) and a second vibration risk region (&#x3b1;), the dwell time (&#x394;T) thereof is measured, and once this dwell time (&#x394;T) reaches a predetermined vibration assessment time (&#x394;T_Lim), the gear ratio of the continuously variable transmission is corrected towards the large side (low side) so that the operating point is moved out of the vibration risk regions (&#x3b1;).

Control device for vehicle

A driving force transmission apparatus is provided for a twin clutch transmission with two clutches, that are controlled a gear change control without a torque cutting out to reduce slapping sounds of the gears by performing a pre-shift operation before the gear shift control. For instance, in an up-shift operation from second speed to third speed, the clutch that transmits torque to the third speed gear set is slip-engaged and one gear of the third speed gear set is connected through a synchronous engagement device to a countershaft. During the pre-shift, a sub torque transmission path that is formed transmits engine torque of the engine, a crankshaft, the clutch, a first input shaft, the third speed gear set, the countershaft, and a differential gear system, preventing the first input shaft from becoming idle and the slapping sound of the gears in an engagement part of the third speed gear set.

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Kawasaki, Japan

Toshiya Sakai