Toyota Jidosha Kabushiki Kaisha

Tsuyoshi Yoshimi

Shingo Koumura

A characteristic is set to a first transmission force characteristic. A sensitivity is set to a first sensitivity. The maximum value of the square of a product of a value representing the first transmission force characteristic and a value representing the first sensitivity in a predetermined frequency range preset so as to include a frequency at which the value representing the first transmission force characteristic takes a peak value is set to an evaluation indication value. A complex spring constant in the vehicle longitudinal direction of the rear wheel suspension is set so that the evaluation indication value takes the minimum value out of values in a variable range of the evaluation indication value.

Suspension device for vehicle

A vehicle suspension device includes a suspension device main body configured to support a wheel of a vehicle to a vehicle body of the vehicle; an upper intervening member configured to be intervened between a vertically upper portion of the suspension device main body and the vehicle body so that a front-back stiffness of the vehicle is relatively decreased at a time of smooth-braking of the vehicle at which an absolute value of a braking force of the vehicle is relatively small, compared to at a time of non-braking of the vehicle; and a lower intervening member configured to be intervened between a vertically lower portion of the suspension device main body and the vehicle body so that the front-back stiffness of the vehicle is relatively increased at the time of smooth-braking of the vehicle, compared to at the time of non-braking of the vehicle.

Vehicle suspension device

The height of a vehicle can be estimated inexpensively by: detecting a wheel speed, which is a speed of each wheel; performing frequency analysis of the detected wheel speed of a pair of left and right wheels and calculating respective wheel speed characteristics of the left and right wheels at a gain-specific frequency; calculating a left-right wheel speed gain difference on the basis of the calculated wheel speed characteristics of the left and right wheels; and estimating the vehicle height on the basis of a corresponding relationship between a wheel height of the wheel with respect to a vehicle body and a value (wheel speed/road surface input gain) that is based on wheel speed and a road surface input that is inputted from the road surface to the wheels, and on the basis of the left-right wheel speed gain difference.

Vehicle height estimation device and vehicle height estimation method

A vehicle suspension device includes a suspension device main body configured to support a wheel of a vehicle to a vehicle body of the vehicle; a varying device configured to cause an upper connecting portion stiffness and a lower connecting portion stiffness to be variable, the upper connecting portion stiffness being a stiffness between a vertically upper portion of the suspension device main body and the vehicle body, and the lower connecting portion stiffness being a stiffness between a vertically lower portion of the suspension device main body and the vehicle body; and a control device configured to control the varying device at a time of braking of the vehicle to perform control which causes the upper connecting portion stiffness to be relatively decreased and causes the lower connecting portion stiffness to be relatively increased, compared to at a time of non-braking of the vehicle.

Growing community of inventors

Susono, Japan

Tsuyoshi Yoshimi