Patent ID: 9586587
Date: 2017-03-07
CPC Classifications: B60W,B60Y

Claim:
1. A control system for a vehicle in which a transmission unit, including a continuously variable transmission unit that is able to continuously change a speed ratio, is coupled to an engine via a fluid coupling including a lockup clutch, a spring damper is provided between the transmission unit and the lockup clutch, a dynamic damper is provided in the transmission unit, the dynamic damper includes a base portion and a mass body that oscillates with respect to the base portion, the base portion is coupled to the transmission unit such that a moment of inertia of the transmission unit is included in a moment of inertia of the base portion, the control system comprising: a controller configured to control an operating point of the engine, which is an optimal operating condition of the engine represented on a map and determined by an output torque and an output rotation speed of the engine and a predetermined speed ratio equivalent value, the controller being configured to obtain a speed ratio equivalent value that is determined by at least one predetermined speed ratio equivalent value set in the transmission unit and is a ratio of, an output ratio between a predetermined output rotation speed of the engine and a predetermined output rotation speed of the transmission unit, and a predetermined output rotation speed of the engine, and the controller being configured to control the engine by setting the operating point of the engine such that a first operating point for a first predetermined speed ratio equivalent value is less than a second operating point for a second predetermined ratio equivalent value in a case where the lockup clutch is engaged and the first predetermined speed ratio equivalent value is greater than the second predetermined speed ratio equivalent value.