Hydraulic or pneumatic pressure control device and its application in devices regulating the pressure of tires of vehicles in motion
First Claim
1. A device for controlling hydraulic or pneumatic pressure adapted to be interposed between a source of pressure, a utilization chamber and an escape, so as to ensure a feeding of fluid under pressure to said chamber or reservoir, and a discharge of the fluid under pressure from said reservoir to the escape, said device comprising a single body including a first orifice arranged to be connected to the source of pressure, a second orifice arranged to be connected to the utilization reservoir, a third, escape orifice, means responsive to a first control pressure, of low value, for connecting the utilization reservoir to the escape orifice, means responsive to a second pressure, of high value, for putting said second orifice in communication with the source of pressure and for preventing communication between said second orifice and the escape orifice, and a short passage of relatively large cross section, unconnected to said first orifice, directly connecting said escape orifice and said second orifice together.
1 Assignment
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Accused Products
Abstract
The device comprises, in a housing formed from two parts (102,103), disposed on opposite sides of a diaphragm (104), three orifices, namely an orifice (105) capable of receiving the low and high pressure and ensuring the purge, the second (107) connected to the pneumatic tire, and the third (106) of large diameter for a rapid escape, an escape valve (110) being normally closed while a passage (116) between the first and second orifices is normally closed and a passage (121) of large diameter between the second orifice and the escape valve (110) is normally open. Application in the measurement, the inflation and the deflation of vehicle pneumatic tires.
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Citations
25 Claims
- 1. A device for controlling hydraulic or pneumatic pressure adapted to be interposed between a source of pressure, a utilization chamber and an escape, so as to ensure a feeding of fluid under pressure to said chamber or reservoir, and a discharge of the fluid under pressure from said reservoir to the escape, said device comprising a single body including a first orifice arranged to be connected to the source of pressure, a second orifice arranged to be connected to the utilization reservoir, a third, escape orifice, means responsive to a first control pressure, of low value, for connecting the utilization reservoir to the escape orifice, means responsive to a second pressure, of high value, for putting said second orifice in communication with the source of pressure and for preventing communication between said second orifice and the escape orifice, and a short passage of relatively large cross section, unconnected to said first orifice, directly connecting said escape orifice and said second orifice together.
- 17. In a system for regulating pressure of pneumatic tires of a vehicle in motion, said system comprising a plurality of devices each comprising a single body including a first orifice arranged to be connected to a source of pressure, a second orifice arranged to be connected to a pneumatic tire, a third, escape orifice, means responsive to a first control pressure, of low value, for connecting the pneumatic tire to the escape orifice, means responsive to a second pressure, of higher value, for putting said second orifice in communication with the source of pressure and for preventing communication between said second orifice and said escape orifice, and a short passage of relatively large cross section, unconnected to said first orifice, directly connecting said escape orifice and said second orifice together, each of said devices being mounted on a vehicle wheel carrying the tire or a group of tires to be inflated.
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24. A system according to claim further comprising a central control calculator for controlling said plurality of electrovalves responsive to the pressure-measuring units and capable of controlling said electrovalves in accordance with the following sequences:
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for measuring pressure;
feeding a high pressure pulse in a pipe leading to a wheel and then blocking said pipe and measuring the pressure in an region of said pipe;for deflation;
measuring pressure in a region of the pipe and then feeding a low pressure pulse in the pipe for a given duration;for inflation;
measuring pressure in the region of the pipe and then feeding a high pressure in the pipe for the given duration, then measuring and then, adjusting by successive inflation or deflation. - View Dependent Claims (25)
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Specification