Wheel suspension units each having fluid spring chambers are arranged in a vehicle suspension apparatus. A roll control quantity determined in accordance with the relationship between a vehicle velocity and a steering angular velocity, i.e., inlet solenoid valves and exhaust solenoid valves, are controlled in accordance with a solenoid ON/OFF time, thereby controlling the roll of a vehicle.

Vehicle suspension apparatus

A vehicle, which has a body and a plurality of wheels, has a suspension system which includes: an actuator for each wheel, each of which supports the body from one of wheels and is controllable to provide a variable force between the body and the wheel; a sensor for detecting acceleration of the body and for producing a signal representative thereof, a sensor for each wheel for detecting load acting between the body and the wheel and for producing a signal representative thereof; and a controller for inputting the signals representative of the acceleration of the body and the load on each wheel, for calculating based thereupon fluctations in load acting between the wheels and the body, for controlling the actuators to increase or decrease forces provided thereby between the body and the wheels, and for operating by feedback action by comparing the actual fluctuation in the force between the respective wheel and the body as sensed by the load sensor for the wheel with the calculated value therefor, and for bringing the difference between the two values to be zero. Optionally, the acceleration sensor can include either a means for sensing lateral acceleration or a means for sensing roll angle acceleration or both of these; and in the latter case this control means can utilize for control either the lateral acceleration information or the roll angle information, depending on whether the signs of these accelerations are opposite or are the same, respectively.

Vehicle active suspension system incorporating acceleration detecting means

A control system for stabilizing the rolling of a vehicle, having control elements arranged between vehicle wheel carriers or wheel suspension members and the vehicle body to generate forces approximately in a vertical direction. The control system is activated only when threshold values for the lateral acceleration of the vehicle and for the steering wheel turning angle are exceeded. When the control system is activated, the control elements generate a rolling moment at the vehicle body counteracting the rolling motions caused by driving conditions and at first completely, or for the most part, only at the rear wheel axle. In a transition period, which depends on vehicle parameters, the control system will then change the rolling moment distribution between the front wheel axle and the rear wheel axle to a given fixed rolling moment distribution.

Control system for stabilizing the rolling of a vehicle

A method is provided for measuring the milling depth of a road milling machine, the machine being operative to mill a ground surface with a milling roller lowered to a milling depth to create a milling track, the machine including at least one side plate located to at least one side of the milling roller to engage an untreated ground surface, and the machine including a stripping plate operative to be lowered onto the milling track generated by the milling roller The method includes measuring the milling depth of the milling track, the measuring including detecting a measurement value of a ground engaging sensor engaging the milling track

Road Milling Machine and Method for Measuring the Milling Depth

A vehicle wheel suspension system includes a suspension device having a double acting hydraulic actuator, of which the piston position is adjustable in response to forces acting on the piston and/or to a selective control input, and a load bearing strut operable in response to the actuator piston experience to minimize the actuator load. The device comprises an inner member having a portion slidable within an outer member with the piston on the inner member and slidably engaging the outer member and a fluid body operative between the members, the volume of which is selectively adjustable to alter and strut pre-load and load deflection characteristics. The fluid body may be a body of oil or a gas.

Vehicle suspension arrangements

An attitude control for a car suspension in which the relative pressures and rates of displacement of the suspension dampers is monitored by a central control and compared with inertial sensors. The control provides correction signals for the height adjusting valves so that the vehicle tilts into curves for improved comfort and road holding. The control provides a fast response as well as a height control for the suspension. The response is fast enough to follow changes in steering setting.

Dieter Dipl Ing Zetsche

Papers

Attitude control for car suspension - incorporates displacement monitors on dampers and inertial sensors linked to central control