A damper control system includes a controller configured to estimate a temperature of a damper fluid based on data relating to heat added to and heat removed from the fluid. At least one damper is operatively coupled to the controller, and the controller is configured to control a size of a damper flow path of the at least one damper based on the estimated temperature. Methods relate to controlling at least one damper based on an estimated temperature of a damper fluid.

Methods and systems are provided for conducting an evaporative emissions test on a fuel system in a vehicle. In one example, in response to a determination, based on the prevailing vehicle and ambient thermal conditions, that altering vehicle height may increase pressure or vacuum build during a pressure or vacuum build phase of an engine off natural vacuum test, employing the vehicle's active suspension to make said height adjustments. In this way the accuracy of engine off natural vacuum testing can be improved, and the conditions under which such testing can be efficaciously conducted increased.

An air suspension system is provided with air spring devices, a pressure accumulation tank, a compressor device that supplies compressed air at least to the pressure accumulation tank, and that includes an electric motor, a pump device, and a dryer, and a control device that performs a vehicle height increase control, a vehicle height decrease control, an air suction control, and a regeneration air discharge control. The control device performs a heat accumulation control, by actuating the pump device with the communication between the compressor device and the air spring devices being blocked, supplying the compressed air discharged through the dryer to the pump device to be circulated, and accumulating heat of compression of the compressed air in the dryer, to regenerate the dryer.

An object of the present invention is to obtain an electromagnetic suspension apparatus capable of meeting a request to improve ride comfort irrespective of a magnitude of a spring constant preset in a spring member. The electromagnetic suspension apparatus includes an electromagnetic actuator that generates a driving force related to vibration damping of the vehicle body, an information acquisition unit that acquires information on a stroke position of the electromagnetic actuator, and an ECU that calculates a target driving force of the electromagnetic actuator and controls a driving force of the electromagnetic actuator using the calculated target driving force. When the stroke position acquired by the information acquisition unit is in a neutral range including a neutral position, the ECU corrects the target driving force so as to reduce a spring force related to the spring member as compared with when the stroke position is in a non-neutral range.

A damper control system includes a controller configured to estimate a temperature of a damper fluid based on data relating to heat added to and heat removed from the fluid. At least one damper is operatively coupled to the controller, and the controller is configured to control a size of a damper flow path of the at least one damper based on the estimated temperature. Methods relate to controlling at least one damper based on an estimated temperature of a damper fluid.

Aspects relate to control systems for dampers (200), damper systems (300), vehicle suspension systems, vehicles (700), methods (600) and computer software, as claimed in the appended claims. A control system (100) for a damper (200) of a suspension system of a vehicle (700) is provided, the control system comprising one or more controllers. The control system (100) is configured to: receive a temperature signal (402) indicative of an ambient temperature in an environment in which the vehicle is located; determine (404) if the damper is operating outside a predetermined ambient temperature range in dependence on the temperature signal; and when the damper is determined to be operating outside the predetermined ambient temperature range, output a modified electrical current request (406) to control the damper, the modified electrical current request being modified with respect to an electrical current request output to the damper when the damper is determined to be operating within the predetermined ambient temperature range.

Aspects relate to control systems for dampers (200), damper systems (300), vehicle suspension systems, vehicles (700), methods (600) and computer software, as claimed in the appended claims. A control system (100) for a damper (200) of a suspension system of a vehicle (700) is provided, the control system comprising one or more controllers. The control system (100) is configured to: receive a temperature signal (402) indicative of an ambient temperature in an environment in which the vehicle is located; determine (404) if the damper is operating outside a predetermined ambient temperature range in dependence on the temperature signal; and when the damper is determined to be operating outside the predetermined ambient temperature range, output a modified electrical current request (406) to control the damper, the modified electrical current request being modified with respect to an electrical current request output to the damper when the damper is determined to be operating within the predetermined ambient temperature range.