| abstract |
In a vehicle capable of coasting by separating an engine and wheels during traveling, a traveling control device for a vehicle that can achieve both fuel efficiency and drivability is provided. When the transmission oil temperature Toilt is relatively low, the friction (friction) in the automatic transmission is increased and the inertial traveling distance is shortened. By performing the neutral inertia running at this time, it is possible to prevent the engine 12 from being stopped and restarted and to prevent the deterioration of the drivability. On the other hand, when the transmission oil temperature Toilt becomes higher, the friction in the automatic transmission becomes smaller and the inertia traveling distance becomes longer. Therefore, even if free-run inertia traveling is performed, the engine 12 does not frequently start and stop. Therefore, by performing free-run coasting, fuel consumption can be improved while preventing deterioration of drivability. [Selection] Figure 4 |