A road surface condition is determined appropriately. A road surface determining section (84) configured to determine a road surface condition with reference to a wheel speed signal indicative of wheel speeds includes a band-stop filter (841) which acts on the wheel speed signal and has a cutoff frequency band which is changed in accordance with the wheel speed signal.

A damping force of a suspension is controlled appropriately in accordance with a road surface condition. An ECU (600) includes: a road surface determining section (84) configured to determine a road surface condition; and a rolling attitude control section (682) configured to calculate a steering-based desired control variable, which is a candidate for a control variable for controlling a damping force of a suspension, in accordance with a result of the determination by the road surface determining section (84).

Methods and systems are provided for diagnosing a shock absorber coupled to a vehicle tire. In one example, a sensor of a tire pressure measurement system coupled inside a tire is used to measure a tire pressure as well as an oscillatory behavior of the tire. A state of health of a shock absorber coupled to the tire is estimated based on the oscillatory behavior.

Suspension systems for recreational vehicles are disclosed. The suspension systems may include at least one adjustable member coupling a sway bar to respective suspensions. The suspension systems may include a torque actuator associated with a sway bar.

A method for controlling a suspension system for a vehicle to obtain optimal parameters for the damping coefficients of the vehicle suspension that minimize acceleration along a heave axis, angular acceleration around a roll axis and angular acceleration around a pitch axis is provided. These parameters may be recorded during the tuning phase or may also be continuously obtained during use of the vehicle by an end user. Also disclosed is a suspension system for a vehicle configured to advantageously operate according to the method.

Provided is an electronically controlled suspension system for estimating a rear wheel acceleration, which includes: a sensor unit measuring an acceleration value of a front wheel; a storage unit storing the acceleration value of the front wheel; and a control unit electrically connected to the sensor unit and the storage unit, and storing the acceleration value of the front wheel in the storage unit, and estimating the acceleration value of a rear wheel by using the acceleration value of the front wheel, wherein the storage unit has a front wheel acceleration buffer, the front wheel acceleration buffer is constituted by several cells, and the several cells are distinguished by a distance index, and the control unit stores the acceleration value of the front wheel corresponding to the distance index in each of the several cells, and the acceleration value of the rear wheel is estimated as the acceleration value of the front wheel, which is stored in a cell positioned behind a location of the front wheel by a wheelbase distance.

A vehicle control apparatus according to an embodiment of the present technology includes a control unit. The control unit generates a control signal for controlling behavior of a vehicle body on a basis of a first acceleration detection signal and a second acceleration detection signal, the first acceleration detection signal including information relating to an acceleration acting on the vehicle body, the first acceleration detection signal having an alternating current waveform corresponding to the acceleration, the second acceleration detection signal including information relating to the acceleration, the second acceleration detection signal having an output waveform, an alternating current component corresponding to the acceleration being superimposed on a direct current component in the output waveform.

Disclosed herein are a vehicle control system and controlling method thereof. The vehicle control system includes a plurality of sensors configured to measure a wheel speed, a steering angle, a yaw rate, and acceleration value, and a controller estimating the state of a vehicle based on the wheel speed, the steering angle, the yaw rate, and the acceleration value and updating a front and rear wheel stiffness of the vehicle when it is determined that the vehicle is running on an asymmetric friction surface from the estimated state of the vehicle.

A vehicle attitude control apparatus is provided in which an active suspension device of each wheel has a mass body arranged between a sprung mass and an unsprung mass of a vehicle, and upper and lower actuators each configured to generate an actively generated force acting on the sprung and unsprung masses, respectively, by applying urging forces to the masses, and a control unit calculates a target braking/driving force of each braking/driving device for achieving target motion state quantities of the vehicle, target actively generated forces of the upper and lower actuators, and controls a braking/driving device and the upper and lower actuators, so that the target braking/driving force and the target actively generated forces of the upper and lower actuators are achieved.

An object of the present invention is to provide a vehicle motion state estimation device capable of estimating a vertical momentum of a vehicle with high accuracy from a wheel speed sensor signal during traveling such as acceleration or deceleration, turning, or the like where wheel slips in longitudinal and lateral directions occur. The present invention estimates and removes a variation component caused by a wheel slip from variation components of a wheel speed sensor signal to extract a variation component caused by a displacement of a suspension, and estimates a vertical momentum of a vehicle from the extracted variation component caused by the displacement of the suspension.