The present disclosure relates to a door protection system (2) for a vehicle (1). The door protection system (2) includes sensor means (10, 11) for detecting an object (O) proximal to the vehicle (1). Processing means (14) are provided to process a signal (S1, S2) received from said sensor means (10, 11) to determine if the detected object (O) obstructs opening of a vehicle door (5, 6). Output means are provided for outputting a suspension control signal (S.sub.SUS) to control operation of a vehicle suspension (7) dependence on determining that the detected object (O) obstructs opening of the vehicle door (5, 6). The present disclosure also relates to a vehicle (1); to a method of controlling operation of a vehicle suspension (7); and to an electronic processor (14).

A vehicle height adjustment system includes: a vehicle height adjustment actuator provided for each wheel of a vehicle; a pressure medium intake and exhaust device configured to supply and exhaust a pressure medium to and from the vehicle height adjustment actuator; and a vehicle height adjustment unit including a computer, the vehicle height adjustment unit configured to: adjust a vehicle height by controlling the pressure medium intake and exhaust device, the vehicle height being a distance between the wheel and a vehicle body; adjust the vehicle height when a get-in estimation condition is satisfied; and limit a number of times the vehicle height is adjusted within a set period to a number of times smaller than a set number of times.

An air source device includes: a tank; a compressor; an intake valve; and an ECU configured to acquire an intake amount, which is an amount of air sucked from an outside and supplied to the tank by the compressor, based on an increasing amount of a tank pressure, which is a pressure of the air accommodated in the tank, the increasing amount being an increasing amount from a time point when the intake valve is estimated to be changed from a closed state to an opened state.

A suspension system includes: suspensions that respectively include vehicle height control actuators; a pressure medium supply-discharge device; and a vehicle height controller configured to control the pressure medium supply-discharge device to control vehicle height, wherein a magnitude of resistance that is generated during a change in the vehicle height at one or more of the suspensions is larger than a magnitude of resistance at another one or more of the suspensions, and the vehicle height controller is configured to execute vehicle height control for the wheel that corresponds to the one or more of the suspensions with the large magnitude of the resistance prior to vehicle height control for the wheel that corresponds to the other one or more of the suspensions with the small magnitude of the resistance.

A valve control device is configured to execute a specific valve control when a valve switching condition at high pressure is satisfied. The specific valve control switches the spring constant change valves for front wheel to a blocking state and switches a spring constant change valves for rear wheel to a communication permission state. The valve switching condition at high pressure is satisfied when oil pressure of hydraulic oil of rear wheel side oil hydraulic cylinders, which is detected by rear wheel side oil pressure detection means, is more than or equal to a predetermined oil pressure threshold and the traveling state determination means determines that a vehicle is in a predetermined traveling state.

A method for controlling the level of an air-suspended motor vehicle includes determining, by a sensor system, at least one of the speed of travel or the actuation state of a parking brake, measuring, if at least one of the speed of travel has undershot a minimum speed of travelor the parking brake has been actuated, the actual level in the region of each air spring bellows, comparing the measured values for the actual level with the predetermined setpoint level, determining an actual level value of an air spring bellows having the greatest deviation from the setpoint level, and expanding, for the air spring bellows having an actual level having the greatest deviation from the setpoint level, the tolerance band by at least one of increasing the upper tolerance limit thereof to a corrected upper tolerance limit or lowering the lower tolerance limit thereof to a corrected lower tolerance limit.

A vehicle-height adjusting system includes: vehicle-height adjusting actuators each for adjusting a vehicle height for a corresponding one of wheels; a pressure medium supplier for supplying a pressure medium from a tank to each of the vehicle-height adjusting actuators; and a vehicle height adjuster for adjusting the vehicle height for each wheel. The vehicle-height adjusting actuators include a left vehicle-height adjusting actuator and a right vehicle-height adjusting actuator. The vehicle height adjuster includes a supply amount controller configured to control the pressure medium supplier such that substantially the same amount of the pressure medium is to be supplied from the tank to the left vehicle-height adjusting actuator and the right vehicle-height adjusting actuator, when at least one of the wheels is in contact with an uneven road surface.

A ride-height adjustment system for a vehicle. The system has a first detector, to detect a preliminary end-of-journey (EOJ) event, such as seat belt unbuckling or ignition switch-off. A controller adjusts the vehicle's suspension system in a first movement in response to detection of the preliminary EOJ event, to change the ride height of the vehicle towards an access ride height of the vehicle. The access ride height is a predetermined ride height that facilitates egress from and entrance to the vehicle. A second detector detects opening of a door of the vehicle. When the ride height of the vehicle remains different from the access ride height after the first movement, the controller adjusts the suspension system in a second movement in response to the door-opening detection. This further changes the ride height of the vehicle towards the access ride height of the vehicle.

A vehicle-height adjusting system includes: vehicle-height adjusting actuators each for adjusting a vehicle height for a corresponding one of wheels; a pressure medium supplier for supplying a pressure medium from a tank to each of the vehicle-height adjusting actuators; and a vehicle height adjuster for adjusting the vehicle height for each wheel. The vehicle-height adjusting actuators include a left vehicle-height adjusting actuator and a right vehicle-height adjusting actuator. The vehicle height adjuster includes a supply amount controller configured to control the pressure medium supplier such that substantially the same amount of the pressure medium is to be supplied from the tank to the left vehicle-height adjusting actuator and the right vehicle-height adjusting actuator, when at least one of the wheels is in contact with an uneven road surface.

An air source device includes: a tank; a compressor; an intake valve; and an ECU configured to acquire an intake amount, which is an amount of air sucked from an outside and supplied to the tank by the compressor, based on an increasing amount of a tank pressure, which is a pressure of the air accommodated in the tank, the increasing amount being an increasing amount from a time point when the intake valve is estimated to be changed from a closed state to an opened state.