Abstract:
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.
Abstract:
In accordance with a vehicle motion control apparatus, a steering wheel torque (Th) generated in accordance with an operation of a steering wheel is determined in accordance with a steering wheel torque arithmetic process (30b) by EPS_ECU by using a steering torque (Tp) generated in a second steering shaft of a gear ratio variable mechanism, a motor torque (Tvm) generated by a motor (32m) of the gear ratio variable mechanism and a rotation angle (θvm) of the motor (32m), on the basis of a dynamic equation expressing a torque transfer by the gear ratio variable mechanic Accordingly, even in the case that the vehicle motion control apparatus employs a structure that the gear ratio variable mechanism is interposed between the steering wheel and a torque sensor, the steering wheel torque (Th) can be known without adding any new torque sensor or the like. Therefore, it is possible to improve a motion controllability of the vehicle without increasing a number of parts by using the steering wheel torque (Th) for an ESP control process (30a).
Abstract:
In a stabilizer control apparatus for a vehicle, a stabilizer includes a pair of stabilizer bars disposed between a right wheel and a left wheel of the vehicle, and an actuator having an electric motor and a speed reducing mechanism disposed between the stabilizer bars. A turning determination device is provided for determining change in turning operation of the vehicle. And, a controller is provided for changing a control parameter of the electric motor in response to the result determined by the turning determination device, to control a torsional rigidity of the stabilizer. As for control parameters of the electric motor, may be employed a desired value of electric current for actuating the electric motor, for example.
Abstract:
The present invention is directed to a vehicle motion control apparatus, which includes a steering factor detection unit for detecting at least one of steering factors including a steering torque and steering effort applied to a steering system, an aligning torque estimation unit for estimating an aligning torque produced on at least a wheel of the vehicle on the basis of the steering factor, a vehicle state variable detection unit for detecting a state variable of the vehicle, a wheel factor estimation unit for estimating at least one of wheel factors including a side force and slip angle applied to the wheel on the basis of the vehicle state variable, and a grip factor estimation unit for estimating a grip factor of at least a tire of the wheel, in accordance with the estimated alignment torque and the estimated wheel factor. The apparatus further includes a first control unit for performing a closed loop control on the basis of the grip factor, and a second control unit for performing a closed loop control on the basis of a deviation between a detected actual vehicle behavior and a desired vehicle behavior set on the basis of the vehicle state variable.
Abstract:
The present invention is directed to a wheel grip factor estimation apparatus, which includes a steering factor detection unit for detecting at least one of steering factors including a steering torque and steering effort applied to a steering system extending from a steering wheel to a suspension of a vehicle, an aligning torque estimation unit for estimating an aligning torque produced on at least a wheel of the vehicle on the basis of the steering factor detected by the steering factor detection unit, and a vehicle state variable detection unit for detecting a state variable of the vehicle. The apparatus further includes a wheel factor estimation unit for estimating at least one of wheel factors including a side force and slip angle applied to the wheel on the basis of the vehicle state variable, and a grip factor estimation unit for estimating a grip factor of at least a tire of the wheel, in accordance with a relationship between the estimated alignment torque and the estimated wheel factor.
Abstract:
A suspension control device includes a wheel grip state estimation device for estimating grip state of vehicle wheels based on variations of aligning torque of wheels to be steered, a vehicle rolling control device for controlling vehicle rolling, and a control parameter setting device for setting a control parameter of the vehicle rolling control device based on at least estimated grip state of the wheel grip state estimation device.
Abstract:
A grip factor estimating apparatus includes a steering torque detecting unit M1, and an assist torque detecting unit M2. When a self-aligning torque estimating unit M6 estimates self-aligning torque generated in front wheels on the basis of detection result of the detecting unit, the quantity of influence of longitudinal force on self-aligning torque is removed on the basis of longitudinal force acting on the front wheels and estimated by a longitudinal force estimating unit M15 and a front wheel slip angle estimated by a front wheel slip angle estimating unit M9y. A grip factor estimating unit M12 estimates the grip factor of the front wheels on the basis of change in self-aligning torque in accordance with the side force.
Abstract:
In vehicle roll sensing of the present invention, a self-aligning torque (SAT) estimator estimates a composite value of SATs generated on tire contact patch of right and left wheels. A slip angle computer detects a vehicle speed and a steering angle and computes a slip angle of the wheel from the measured vehicle speed and steering angle. An SAT model value computer estimates an SAT model value as a composite value of SATs of the right and left wheels when no load shifts between the right and left wheels on the basis of the slip angle. A load shift ratio estimator estimates a load shift state of the right and left wheels on the basis of the composite value of the SATs of the wheels and the SAT model value. A vehicle rollover estimator estimates a rollover of the vehicle on the basis of the estimated load-shift state.
Abstract:
An operating characteristics control device for a vehicle includes a physical constitution detecting device for detecting a physical constitution of a passenger, an operation device operated by the passenger, a condition changing device operated by the operation device and changing the condition of the vehicle and an operating characteristic setting device for setting a characteristic showing a relationship between an operating force applied to the operation device and the condition of the vehicle changed by the operation of the condition changing device in response to the physical constitution of the passenger detected by the physical constitution detecting device.
Abstract:
A vehicle control device incorporating an electric power steering is provided, wherein an extraordinary yaw motion acting on a vehicle is detected and is suppressed or moderated, so that the stability of the vehicle in a straight-ahead steering is improved. The causes of the extraordinary yaw motion are one of lateral wind, asymmetrical surface state of the road, lateral slant of the road and the like. A countermeasure against the extraordinary yaw motion is taken by applying a counter (opposite direction) yaw motion on the vehicle or switching over the control mode from a proportional control to a proportional integral control.