Ntn Corporation

Tomohiro Sugai

Katsuaki Sasaki

Kentaro Nishikawa

Takahiro Wakuda

Satoshi Utsunomiya

Kazunori Inamasu

Yuu Matsumoto

A vehicle orientation control device is provided in a four wheel drive vehicle capable of applying braking and driving force to each of the vehicle wheels. The vehicle orientation control device () is provided in a vehicle control device () for controlling the four wheel drive vehicle and includes a standard yaw rate calculating unit (), a yaw rate sensor (), a target yaw moment calculating unit (), a braking and driving force commanding unit (), and a yaw moment control unit (). The yaw moment control unit () includes an allocation ratio varying unit () for continuously changing the front and rear allocation ratio of the yaw moment control torque to be distributed to the front and rear wheels () and () in dependence on the detected actual yaw rate that is detected by the yaw rate sensor ().

Vehicle orientation control device

The vehicle attitude control device generates target yaw moment on the basis of the deviation between a standard yaw rate and an actual yaw rate and is applied to a vehicle driven with the target yaw moment. The vehicle attitude control device is provided with a detection speed processor that performs a process such that a vehicle speed gently changes, a limit yaw rate calculator that determines a limit yaw rate by dividing lateral acceleration by the processed vehicle speed, and a standard yaw rate corrector that corrects the standard yaw rate using the limit yaw rate when the standard yaw rate is higher than the limit yaw rate. A target yaw moment calculator generates target yaw moment on the basis of the deviation between the standard yaw rate corrected by the standard yaw rate corrector and the actual yaw rate.

Vehicle attitude control device

A PI/PID controller that generates a torque compensation value Kthrough PI control or PID control, from a deviation between an allowable rotation speed and a rotation speed of a wheel; an adder that adds the torque compensation value to a torque command input value received from a higher-order controller, thereby obtaining a torque command output value; and a dead time compensator that has a control target model including a dead time and that applies a dead time compensation in generation of the torque compensation value by the Smith method. An input to the dead time compensator is an output of a P compensation or a PD compensation excluding an I compensation from a PI compensation or a PID compensation.

Slip control device

A sealed bearing includes an inner race; and seal members each including a seal lip made of rubber. Each seal lip includes a plurality of protrusions circumferentially spaced apart from each other, and kept in sliding contact with the inner race with fluid lubrication condition generated between the protrusions and the inner race. Each protrusion has a circular arc-shaped cross section along the circumferential direction, and the circular arc-shaped cross section has a radius of 0.4 mm or more and less than 9.0 mm.

Sealed bearing

A vehicle electronic stability control system which allows a vehicle to have improved movement performance and limit performance without causing a driver to feel uncomfortable, by actuating electronic stability control from a state where a lateral slip is relatively less likely to occur. The system prevents a skid of a vehicle. The system is provided with a stability determination module that obtains information indicating vehicle behavior from a sensor, and determines whether the vehicle is in an unstable or less stable state, on the basis of the information. The system is further provided with a braking/driving force control module which, when the stability determination module determines that the vehicle is in the unstable or less stable state, applies a braking force to one of the drive wheels, and simultaneously applies a driving force to the motor for the other drive wheel.

Electronic stability control system for vehicle

Provided is a control device for a steer-by-wire steering mechanism, the control device including: a tire lateral force detection unit configured to detect tire lateral forces acting on left and right wheels; and a toe angle control unit configured to control toe angles of left and right wheels independently of each other such that the detected tire lateral forces become target lateral forces. Not during deceleration, the toe angle control unit sets target lateral forces FLt and FRt such that the total sum of the left and right target lateral forces is not changed and the total sum of absolute values thereof is decreased, and during deceleration, the toe angle control unit sets the target lateral forces FLt and FRt such that straight traveling stability can be obtained.

Control device for steer-by-wire steering mechanism

A steer-by-wire steering device includes a steering wheel connected with a steering shaft, a steering angle sensor, a steering reactive force motor, and a steering control unit for controlling a steering shaft drive motor and the steering reactive force motor. Provided is a power transmitting mechanism for transmitting the power from the steering shaft drive motor to the steering shaft. A changeover unit for selectively connecting and disconnecting the power is disposed on the way thereof. The changeover unit includes a clutch mechanism comprised of an input member and an output member juxtaposed in an axial direction for movement in the axial direction and, also, rotatable relative to each other, a clutch groove provided in one of those members, and a clutch rolling element provided in the other of those members and biased in a radial direction by the clutch groove so that it can be selectively engaged and disengaged.

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Iwata, Japan

Tomohiro Sugai