초록 ▼

An automatic level control device for vehicles is furnished with an electrically triggered shut-off valve (44). The shut-off valve (44) can be loaded with a pressure in closure direction corresponding to an air-suspension pressure. The force to be exerted by the electrical actuation device (23) for

An automatic level control device for vehicles is furnished with an electrically triggered shut-off valve (44). The shut-off valve (44) can be loaded with a pressure in closure direction corresponding to an air-suspension pressure. The force to be exerted by the electrical actuation device (23) for opening of the shut-off valve (44) is independent of the closure pressure loading the shut-off valve (44). The device components of the electrical actuation device (23) of the shut-off valve (44) can be furnished of small volume size and the passage cross-section of the shut-opff valve (44) can be formed of relatively large size. The device serves for automatic level control devices for vehicles.

대표청구항 ▼

An automatic level control device for vehicles with air suspension comprising a vehicle chassis; a vehicle axle; an air suspension system spring-supporting the vehicle chassis against the vehicle axle, wherein the air suspension system includes a level measurement device sensing a relative horizonta

An automatic level control device for vehicles with air suspension comprising a vehicle chassis; a vehicle axle; an air suspension system spring-supporting the vehicle chassis against the vehicle axle, wherein the air suspension system includes a level measurement device sensing a relative horizontal level of the vehicle chassis with respect to a relative horizontal level of the vehicle axle and having an output terminal providing an electrical output signal; an electronic control device connected to the output terminal of the level measurement device and including a stored set-point level value and a comparison device serving for a comparison of the output signal of the level measurement device with a set-point level value; a pressure means source; a valve device connected to the electronic control device and actuatable with control output signals of the electronic control device, and wherein the valve device includes a directional control valve, with a valve body and a valve seat, where the valve body exerts, in the closure direction, a pressure of the air spring and the force of a valve closure spring onto the valve seat, and where the valve body can be lifted off the valve seat in opening direction by an actuation current of the electrical actuation device; an air spring connected to an air spring pressure line; a first pneumatic port furnished at the valve device, where the first pneumatic port is connected to the air spring via the air spring pressure line for loading the valve device with the pressure prevailing in the air spring and for controlling a filling of the air spring with gas from the pressure means source and for emptying the air spring with an output to the atmosphere; a second pneumatic port disposed at the valve device and connected to the pressure means source, where the second pneumatic port is loaded with the pressure of the pressure means source and can be connected with an output to the atmosphere; an electrical actuation device disposed at the seat valve, wherein an auxiliary pressure applies a force, parallel to the force exerted by the electrical actuation device for opening of the seat valve, for the emptying of the air spring, which auxiliary pressure is exerted on the valve body against the pressure of the air spring and against the force of the valve closure spring, and wherein the auxiliary pressure, exerted on the seat valve, can be controlled by an electrical signal generated by an opening of the seat valve.