Realized is a technique for estimating a state quantity of a vehicle, which technique is applicable to estimation of a vehicle weight and allows an increase in accuracy and speed of the estimation. A state quantity estimating device includes a data storing section (101), a predictive quantity computing section (102), an obtaining section (107), a Kalman gain computing section (103), an estimated quantity computing section (104) which calculates an estimated state quantity and estimated covariance, and a process noise covariance correcting section (106) which corrects process noise covariance. The estimated state quantity, the estimated covariance, and the process noise covariance, each of which has been calculated or corrected, are written in the data storing section (101) as a state quantity, state covariance, and process noise covariance, respectively, and are used in a next computation for estimating a state quantity.

A damping force control apparatus for a suspension is applied to a damper whose damping force can be set based on a damping force control value and controls the damping force control value. The damper is attached to a support portion with a buffer member interposed between the support portion of a vehicle body and a cylinder of the damper. The apparatus includes: a displacement related quantity estimation device estimating relative displacement of a vehicle wheel and a relative speed of the vehicle wheel with respect to the vehicle body as estimated relative displacement and an estimated relative speed; and a damping force control value calculation device determining the damping force control value so as to suppress vibration of the vehicle body based on state variables provided from the vehicle body and the estimated relative speed.

A control device for controlling at least one adjustable vibration damper, having a sensor arrangement inside of a housing of the control device that senses the movement of a vehicle body. A damper adjustment is determined using further parameters. The further parameters are determined from the signals of the sensor arrangement by a filter system.

A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

An apparatus and a method for controlling a vehicle suspension, may include a variable damper provided between a vehicle body and a wheel, a sensor that measures a vehicle body vertical acceleration and a wheel vertical acceleration, and a controller that estimates a road surface roughness based on the vehicle body vertical acceleration and the wheel vertical acceleration, predicts a road surface grade based on the estimated road surface roughness, and adjusts damping force of the variable damper corresponding to the predicted road surface grade.

An apparatus and a method for controlling vehicle suspension, which controls a variable damper in consideration of virtual tire damping, may include a variable damper which is installed between a vehicle body and a wheel, a first acceleration sensor which is installed at each corner of the vehicle body to measure a vehicle body corner vertical acceleration, a second acceleration sensor which is installed to each wheel to measure a wheel vertical acceleration, and a controller that estimates a road surface roughness based on the vehicle body corner vertical acceleration and the wheel vertical acceleration, determines a virtual tire damping required damping force based on the estimated road surface roughness, and adjusts a damping force of the variable damper based on the determined virtual tire damping required damping force.

A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

The present disclosure relates to a method for avoiding overheating of a vehicle subsystem, which comprises a compressor with a pressure chamber. The method comprises the steps of executing an Extended Kalman Filter on a control module that calculates an error between a predicted state model of the vehicle subsystem and a corresponding measured state model of the vehicle subsystem, and processes the calculated error to adjust the predicted state model, including adjusting the estimated ambient pressure, based on weighted uncertainties of the measured and estimated parameters. The method further comprises the steps of comparing the estimated ambient pressure to a predetermined ambient pressure default value; and reducing a cut-off pressure target value of the vehicle subsystem by a reduction amount for a period of time, when the estimated ambient pressure is less than or equal to the predetermined ambient pressure default value.

A damping force control apparatus for a suspension is applied to a damper whose damping force can be set based on a damping force control value and controls the damping force control value. The damper is attached to a support portion with a buffer member interposed between the support portion of a vehicle body and a cylinder of the damper. The apparatus includes: a displacement related quantity estimation device estimating relative displacement of a vehicle wheel and a relative speed of the vehicle wheel with respect to the vehicle body as estimated relative displacement and an estimated relative speed; and a damping force control value calculation device determining the damping force control value so as to suppress vibration of the vehicle body based on state variables provided from the vehicle body and the estimated relative speed.