Methods and systems are provided for a vehicle suspension system. In some example methods, a height change request is received for a vehicle suspension having a displacement control for implementing height change requests. A displacement of at least one spring of the vehicle suspension may be determined, as well as whether the displacement satisfies a displacement control criteria. The height of the vehicle suspension may be changed using an air mass control in response to determining the displacement control criteria is not satisfied.

This application describes systems and techniques for adjusting one or more setting(s) of a vehicle based on detected condition(s) to avoid damage due to contact of the tires with a body, chassis, or other components of the vehicle. In some instances, the vehicle may determine a ride height of the vehicle, determine a limited range of steering angles based at least in part on the ride height, and control operation of the steering system of the vehicle based at least in part on the limited range of steering angles. In some instances, the vehicle may determine a steering angle of the vehicle, determine a limited range of ride heights based at least in part on the steering angle, and control operation of the suspension system of the vehicle based at least in part on the limited range of ride heights.

The vehicle height adjustment device includes: a vehicle height adjuster which adjusts vehicle height; a prohibiting mode setter which sets a prohibiting mode that prohibits vehicle height adjustment by the vehicle height adjuster; a first prohibition release unit which performs release of the prohibiting mode in the prohibiting mode setter; and a second prohibition release unit which enables vehicle height adjustment by the vehicle height adjuster, while the prohibiting mode is set by the prohibiting mode setter.

The present invention relates to a system for determining whether to inhibit lowering of the ride height of a vehicle when the vehicle speed exceeds a speed threshold value. The system includes a processor having an input configured to receive ride attribute data from at least one on-board vehicle ride attribute sensor, the ride attribute data being indicative of the roughness of the surface over which the vehicle is travelling, and a data memory configured to store at least one predetermined ride attribute threshold value for the or each ride attribute sensor. The processor is configured to calculate a ride attribute parameter in dependence on the received ride attribute data for the or each ride attribute sensor. The processor is also configured to compare the or each calculated ride attribute parameter with the corresponding at least one predetermined ride attribute threshold value to determine whether the vehicle is travelling on a smooth surface or a rough surface, and to inhibit lowering of the ride height when it is determined that the vehicle is travelling on a rough surface.

Particular embodiments may enable configuring settings of a vehicle in a designated mode. A signal to place the vehicle in a designated mode may be received. A roll angle and a pitch angle of the vehicle as parked may be assessed based on data received from a position sensor built into the vehicle. Signals to adjust an electronically controlled suspension of the vehicle to reduce the roll angle or the pitch angle so that the vehicle is level as parked may be sent based on the assessed roll angle and pitch angle exceeding a threshold value. One or more settings of the vehicle to change default operating characteristics by the vehicle while in the designated mode may be modified.

An electric suspension apparatus includes electric actuators provided for a plurality of wheels, respectively, an acceleration sensor disposed in each of the electric actuators, the acceleration sensor detecting a first acceleration, and an electric suspension control ECU controlling each of the electric actuators based on the first acceleration, and the electric suspension control ECU decreases a control amount to the electric actuator, in a case where a first speed based on the first acceleration in an up-down direction is equal to or less than a predetermined speed.

An electric suspension apparatus includes electric actuators provided for a plurality of wheels, respectively, an acceleration sensor disposed in each of the electric actuators, the acceleration sensor detecting a first acceleration, and an electric suspension control ECU controlling each of the electric actuators based on the first acceleration, and the electric suspension control ECU decreases a control amount to the electric actuator, in a case where a first speed based on the first acceleration in an up-down direction is equal to or less than a predetermined speed.

A vehicle height adjustment device includes a changer, a vehicle speed obtainer, a vehicle height controller, and a malfunction detector. The changer is configured to change a relative position of a body of a vehicle, which includes a plurality of wheels, relative to an axle of each of the plurality of wheels of the vehicle. The vehicle speed obtainer is configured to obtain a vehicle speed, which is a traveling speed of the vehicle. The vehicle height controller is configured to control a vehicle height, which is a height of the body, based on the vehicle speed obtained by the vehicle speed obtainer. The malfunction detector is configured to detect a failure of the vehicle speed obtainer to obtain an accurate value of the vehicle speed.

A vehicle height adjustment device includes a changer, a vehicle height controller, and a malfunction detector. The changer is drivable when supplied with a current and configured to change a relative position of a body of a vehicle relative to an axle of a wheel of the vehicle. The vehicle height controller is configured to perform such control that a target current set based on the relative position is supplied to the changer so as to control a vehicle height, which is a height of the body of the vehicle. The malfunction detector is configured to detect a failure to make the target current flow to the changer.

A suspension device includes an actuator device provided with an extensible/contractible actuator body interposed between a sprung member and an unsprung member of a vehicle, a pump that supplies fluid to the actuator body to extend or contract the actuator body, and a controller that controls a rotation number of the pump. The controller has a road surface state index obtainment unit that obtains a road surface state index and a target rotation number determination unit that determines a target rotation number of the pump on the basis of the road surface state index.