Vehicle control system

Abstract

A control system for a vehicle is provided, which includes a driving force source configured to generate torque for driving drive wheels, a steering angle related value sensor configured to detect a steering angle related value of a steering device of the vehicle, a grille shutter configured to adjust an opening-and-closing degree of an opening formed in a front surface of a vehicle body, and a controller configured to control the torque to control a vehicle attitude based on the steering angle related value. Based on the steering angle related value, when the controller determines that a turning operation of the steering device is performed, it performs a torque decreasing control for reducing the torque to add deceleration to the vehicle, and when the grille shutter opening is large, the controller increases the torque reduction amount in the torque decreasing control more than when the opening is small.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a control system for a vehicle, which controls attitude of the vehicle according to steering.BACKGROUND OF THE DISCLOSURE[0002]Conventionally, a technique is known for controlling the vehicle attitude by causing deceleration or acceleration in the vehicle according to a driver's operation of a steering wheel to improve the response and the stability of the vehicle behavior with respect to the steering operation. For example, when the steering wheel is turned in one direction, the driving force of the vehicle is reduced to add the deceleration. This control increases the load of front wheels corresponding to the turning of the steering wheel, and therefore, the cornering force of the front wheels increases. Thus, the turnability of the vehicle in the early stage of the curve entry improves, and the response and the steering stability for the turning operation of the steering improve.[0003]Meanwhile, for the purpose of improving f...

AI Technical Summary

Problems solved by technology

Here, since the traveling air resistance of the vehicle changes when the grille shutter is opened or closed during the control for the vehicle attitude described above, variation arises in the deceleration of the vehicle, and therefore, the planned vehicle attitude control may not be achieved.

As a result, this changes the load of the front wheels and the cornering force changes.

However, since the conventional technique such as one disclosed in JP6481745B does not take the change in the lift of the vehicle front part accompanying the change in the opening of the grille shutter into consideration, the response to the turning operation of the steering wheel may not be improved, or the response may be adversely increased excessively.

As the result, the cornering force of the front wheels decreases, and the improvements in the response or the steering stability for the turning operation of the steering may not be obtained.

Therefore, it may cause the driver discomfort.

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