Toyota Jidosha Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Jaesung Cho

Shuuichi Buma

Yoshiyuki Yasui

Daisuke Yamada

Hidenori Kajino

A suspension system for a vehicle, including: four displacement force generators each having an electromagnetic motor and configured to generate, based on a motor force generated by the motor, a displacement force forcing sprung and unsprung portions of the vehicle toward or away from each other; and a controller configured to control the displacement force generated by controlling operation of the motor is disclosed. The controller includes a target-value determining portion configured to determine a target value of a displacement-force-relating amount of each of the four displacement force generators, and a target-value reducing portion configured to reduce the target value of the displacement-force-relating amount of a subjected device as one of the four displacement force generators, in accordance with a certain rule. The target-value reducing portion is configured to reduce the target value of the displacement-force-relating amount of each of at least one of non-subjected devices as the other three of the four displacement force generators, in accordance with the certain rule, when reducing the target value of the displacement-force-relating amount of the subjected device in accordance with the certain rule.

Vehicle suspension system

A stabilizer system for a vehicle includes a stabilizer bar and an actuator and that executes a control actively changing stiffness of the stabilizer bar in accordance with roll moment acting on a body of the vehicle. Each of a situation in which the vehicle is running straightforward and a situation in which a torque generating direction of a motor of the actuator changes in opposite direction plural times is identified as a specific situation. In the specific situation, a control of changing an operation mode of the motor such that presence or absence of occurrence of resistance of the actuator against its operation by external input force is changeable, and a control of limiting a supply current to the motor such that the torque generating direction of the motor is inhibited from coinciding with a direction away from a neutral position are executed.

Vehicle stabilizer system

A stabilizer system for a vehicle including: a stabilizer bar connected to left and right wheels at respective opposite ends thereof; an actuator which has an electric motor and which changes elastic force to be exhibited by the stabilizer bar, as a result of control of an operation of the electric motor; and a control device which controls the operation of the electric motor, wherein the control device includes an operation-mode changing portion which changes an operation mode of the electric motor that depends on a motor-phase-connecting formation and a power-supply status of the electric motor, on the basis of at least one of a vehicle running state and road surface condition.

In a stabilizer apparatus for a vehicle, an electronic control unit calculates a target current of an electric motor from vehicle speed, steering angle, and lateral acceleration, and increases and decreases actual current such that the calculated target current flows through the motor. The control unit decreases the actual current by a predetermined amount when the difference between the target current and the actual current becomes smaller than a predetermined value during control of increasing the actual current. The predetermined amount is equal to the difference between the determined target current at the time of the detection of the difference and current which is necessary to obtain, during control of decreasing the actual current, an output torque equal to the output torque of the speed reduction mechanism obtained as a result of the target current flowing through the electric motor.

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Toyota, Japan

Jaesung Cho