Translation of "Pressure solenoid" in German

Air pressure at the solenoid exhaust will also override the solenoid.

The statements made above on maintaining the pressure apply to solenoid valve 15 a and the associated inlet-side diaphragm valve 15 a .

In the position illustrated the oil flows under pressure through the solenoid valves 25, 26, 27 into a line 31, 32 and 33 in each case, which each lead into a diagrammatically illustrated drive volume 34, 35 and 36 of the valves 2, 3, 4.

In the present embodiment, solenoid pressure limit valve 3a, supplied through line 29a with line pressure, produces constant control pressure PS, at which pressure all solenoid valves in the transmission are supplied.

In order to be able to overcome this pressure, the solenoid valve must have either a pilot control or a strong opening magnet, in which a pilot control is time intensive, whereas a strong magnet is weight, volume, and cost intensive.

The three lines 31, 32 and 33 are released from oil pressure by the solenoid valves 25, 26, 27 and the line 40 to the outlet 41, and thus the three drive volumes 34, 35, 36 are also emptied and the springs 42, 43, 44 press the valves 2, 3, 4 into the switching position illustrated in FIG.

To prevent an accidental evacuation of the consumer if there is a failure of the control pressure, the solenoid valves connected with the pressure medium chambers can be designed as pulse valves.

For the shortening of the opening time cross-section, the drain passage is opened during the opening control action of the engine valve, as is known, by the solenoid valve, which is problematic in that a high opening control pressure exists at this instant in the pressure chamber, by which pressure, the solenoid valve is also pressurized.

In an electronic-hydraulic mechanism of the kind mentioned above, this problem is solved by the fact that the pressure-control valves are situated in a first control system of reduced pressure compared to the main pressure system and through which they act with pilot control upon the control valves and the main pressure valve, and the solenoid valves are situated in a second control system also of reduced pressure as compared to the main pressure system, said solenoid valves acting with pilot control upon shift valves which control the supply of pressurized fluid from the main pressure system to the control valves and a reverse locking valve.

If an anti-lock braking system (ABS) is available, the pressure modulators or solenoid valves (MV) used for pressure control must also function very rapidly, so that the desired pressures can be achieved within the usual ABS-control cycle of 2 to 5 seconds.

In the known high pressure pump, a solenoid valve, which is open when without current, is disposed between the low pressure container and the pump cylinder.

In the non-actuated condition of the pressure reducing solenoid valve 26 a flow path exists to a third fluid connection 28 of the pressure reducing solenoid valve 26 from where a fluid line 30 leads to a wheel brake 32.

If the coil holder 4 is built together with the valve block 2, as shown in FIG. 2, this elastic spring element 8 constantly exerts pressure on the solenoid 3 so that its ring yoke 3c is in good contact with the valve block 2.

Depending on the control type of the high-pressure compressor, the option of a suitable pressure reduction unit is also available to limit the system inlet pressure with a solenoid valve (for systems with B-CONTROL) or ball valve (hard-wired control).

This concept has a decisive advantage compared with conventional pressure control via solenoid valves since the piston speed determines the speed of the change in pressure.

These and other objects and advantages are achieved in accordance with the invention, by providing an actuator device with a controllable valve arrangement between the feed air inlet of the position controller and the solenoid valve, where the valve arrangement is actuated by a position limit value sensor which is operable by the actuating element and/or a pressure limit value sensor which records the actuating pressure at the solenoid valve and connects the solenoid valve directly to the feed air when the position limit value sensor detects that a prespecified movement position of the actuating element has been reached or the pressure limit value sensor detects that a prespecified minimum pressure has been undershot.

For example, upon capturing such a high working pressure p 1 followed by a sudden pressure decrease the solenoid valve 43 a is opened while the solenoid valve 43 b adjacent to the venting sink 35 is closed in order to dampen the too high pressure difference between the working chamber 5 and the return chamber 21 .

Consequently, if a disturbance in the position controller causes said position controller to be vented, this disturbance is detected by a corresponding drop in the actuating pressure at the solenoid valve and/or by a corresponding movement of the actuating element out of an operating position. As a result, the controllable valve arrangement is actuated such that the solenoid valve is no longer supplied with feed air by the position controller but rather directly.