Vehicle Dynamics Control Device

摘要

A vehicle dynamics control device includes a control unit that executes braking/driving torque control based upon vehicle information that includes operation input information and vehicle dynamics information. The operation input information includes a lateral motion operation index pertaining to a lateral motion operation executed to generate a lateral motion in the vehicle; the vehicle dynamics information includes a longitudinal acceleration generated in the vehicle and a lateral motion index indicating a lateral motion occurring in the vehicle; and the control unit determines a handling assurance acceleration limit with a maximum longitudinal acceleration value that assumes a substantially linear proportional relationship with the lateral motion operation index and the lateral motion index over a range in which the lateral motion operation index assumes a value equal to or less than a predetermined value or the lateral motion index assumes a value equal to or less than a predetermined value.

主权项

1. A vehicle dynamics control device, comprising:
a unit that controls a braking torque or a driving torque by correcting an acceleration command or a deceleration command inputted by a driver or a control device mounted in a vehicle, wherein: a wheel slip ratio of a tire mounted on the vehicle is defined; a differential value of a longitudinal force of the tire with respect to the wheel slip ratio is defined as a slip stiffness, or a given value is defined as the slip stiffness when the wheel slip ratio is 0 and a slope of a straight line connecting an origin point and a point at which a longitudinal force absolute value achieves with the wheel slip ratio is defined as the slip stiffness when the wheel slip ratio assumes positive values; there is further provided a unit that estimates the slip stiffness; and a braking torque increase upper limit or a driving torque increase upper limit for a wheel is set so as to ensure that the slip stiffness does not become lower than a predetermined value and that a longitudinal force generated at the wheel does not exceed a longitudinal force upper limit set as a steerability assurance limit.