Control system for vehicle

A control system for a vehicle, comprising:

• a steering angle detector configured to detect a steering angle of a steering wheel by an operator, the steering wheel mounted on the vehicle;
• a speed detector configured to detect a traveling speed of the vehicle;
• a reaction-force generator configured to generate a reaction force of the steering wheel;
• a controller electrically connected with the steering angle detector, the speed detector, and the reaction-force generator, the controller including a processor configured to execute:
• a lateral acceleration calculating module to calculate a lateral acceleration based on the traveling speed and the steering angle;
• a rigidity characteristic setting module to set a reaction-force value so that a rigidity value that is a ratio of the reaction-force value to the steering angle increases as the lateral acceleration calculated by the lateral acceleration calculating module increases;
• and
• a reaction-force control module to control the reaction-force generator so that the reaction force generated by the reaction-force generator becomes the reaction-force value set by the rigidity characteristic setting module;
• and
• memory configured to store a rigidity characteristic map defining the rigidity value as a function of the lateral acceleration, the rigidity characteristic map comprising a first linear section and a second linear section connecting to the first linear section at a first changing point defining a first lateral acceleration threshold, a positive slope of the second linear section being greater than a positive slope of the first linear section such that a second rigidity increasing rate defined by the second linear section for lateral accelerations greater than the first lateral acceleration threshold is greater than a first rigidity increasing rate defined by the first linear section for lateral accelerations less than the first lateral acceleration threshold, wherein
• there is an instantaneous change from the first rigidity increasing rate to the second rigidity increasing rate at the first changing point.