MXPA06013353A

MXPA06013353A - Compressor inlet pressure control system.

Info

Publication number: MXPA06013353A
Application number: MXPA06013353A
Authority: MX
Inventors: Hans Burkhardt; Paul G Reisinger; Larry E Dienes
Original assignee: Bendix Commercial Vehicle Sys
Priority date: 2004-06-10
Filing date: 2005-01-06
Publication date: 2007-03-01
Also published as: AU2005257738A1; WO2006001836A1; US20050276702A1; CA2563940A1; DE112005001335T5; CN1965167A

Abstract

An inlet control device includes a status valve and a reed valve. The status valve is positioned as a function of a status of a state of a compressor. Also, the reed valve delivers a reed output pressure to an inlet of the compressor as a function of a reed input pressure on an input side of the reed valve, the position of the status valve, and a rotational speed of the compressor.

Description

COMPRESSOR INPUT PRESSURE CONTROL SYSTEM Background The present invention relates to a compressor. It finds particular application in conjunction with a compressor inlet control device which regulates the inlet pressure to an automotive air compressor and will be described with particular reference thereto. However, it will be appreciated that the invention is also susceptible to other applications. Diesel engines of the type used in heavy vehicles (eg trucks) are commonly equipped with turbochargers, which use the exhaust gases of the engine to compress atmospheric air to charge the intake manifold of the engine with pressurized air. above atmospheric pressure. The use of turbochargers increases the efficiency of the engine in a substantial way. Although turbochargers are more commonly used with diesel engines used in heavy-duty trucks, it is possible that other devices that mechanically increase the pressure level in the intake manifold of the engine, such as superchargers, may also be used. As used in this patent application, the term "turbocharger" will also be considered to represent the supercharger and other devices for mechanically increasing the pressure level in the engine intake manifold. Heavy vehicles of the type equipped with turbocharged diesel engines also commonly have a compressed air engine operated which compresses the atmospheric air for use, for example, in the brake system of the vehicle. Accordingly, the present invention pertains to a system that includes an air compressor powered by the vehicle engine having an intake manifold and a turbocharger to increase the pressure level in the manifold and intake of the engine to pressure levels greater than the atmospheric pressure. The turbocharger has an output communicated to the intake manifold. The air compressor has an entrance and an exit. The air inlet of the compressor is communicated with the output of the turbocharger so that the air supplied at the inlet of the air compressor has been compressed by the turbocharger at a pressure level higher than the atmospheric pressure and the air compressor raises the pressure level at the entrance of the air compressor to a level of pressure even greater than the outlet of the same. The use of the turbocharger outlet as the entrance to the automotive air compressor has several advantages. Air compressors have a tendency to pass lubricating oil into the air that is compressed. The use of turbocharger air tends to reduce this passage of oil into the air which is compressed. In addition, the compressor inlet air with the air (which has already been filtered) at the turbocharger outlet eliminates a separate air filter that would otherwise be necessary. In addition, since the inlet air to the air compressor has already been compressed to a pressure level above atmospheric, the air supply of the air compressor can be increased. However, the use of turbocharger air is beneficial only if the pressure level of the turbocharger outlet is below a certain level of pressure.

Short description In one embodiment, an input control device includes a status valve, positioned as a function of a status of a state of a compressor, and means for regulating a pressure supplied to a compressor inlet as a function of an inlet pressure. , the position of the valve, and the rotational speed of the compressor. In another embodiment, an input control device includes a status valve and a tab valve. The status valve is positioned as a function of a status of a compressor status. Likewise, the tab valve provides a tongue-out pressure for a compressor inlet as a function of 1) a tongue inlet pressure on an inlet side of the tongue valve, 2) the position of the valve status, and 3) a rotational speed of the compressor.

Brief Description of the Drawings In the accompanying drawings that are incorporated in and constitute a part of the specification, the embodiments of the invention are illustrated, which, together with a general description of the invention given above, and the detailed description provided below, serve to exemplify the modalities of this invitation. FIGURE 1 illustrates a control input device in a first mode of operation according to an embodiment of the present invention; and FIGURE 2 illustrates the control input device in a second mode or operation according to an embodiment of the present invention.

Detailed Description of the Illustrated Modality With reference to FIGURE 1, an input control device 10 controls (regulates) an input pressure supplied to the compressor 12. The input control device 10 includes a status valve 14 and a control valve 20. The valve control 20 has a control valve inlet side 22, a control valve outlet side 24, and a control mechanism 26 for regulating how much pressure on the inlet side 22 of the Oontrol 20 valve is supplied to the side of outlet 24. The compressor 12 includes an inlet port 28, which communicates the fluid (for example air) to an inlet manifold 30 of the compressor 12. A discharge port 32 communicates the fluid to the atmosphere through a device of restriction 34 and a crankshaft 36 of the compressor 12. The status valve 14 is set as a function of a status of a condition of the compressor 12. In one embodiment, the status valve 14 is a piston controlled as a funnel. of a status signal towards the compressor 12. More specifically, when the compressor 12 is é? the condition of "under load" or "load", a status signal of "load" is transmitted to the status valve 14 to set the status valve 14 in the raised position, as shown in FIGURE 1; when the compressor 12 is in the "no load" or "discharged" condition, a "discharge" status signal is transmitted to the valve and status 14 to set the status valve 14 to the reduced position (see FIGURE 2) ). In a typical braking system, for example, a regulating valve sends a signal to the compressor based on air pressure in the brake reservoir. While in the selected position, the status valve 14 creates free (unrestricted) fluid communication between the outlet side 24 of the control valve 20 and the compressor inlet 28. Therefore, substantially all of the pressure delivered to the outlet side 24 of the control valve 20 is supplied to the compressor inlet 28. In addition, the status valve 14 substantially seals the discharge port 32. Therefore, substantially none of the pressure supplied to the side outlet 24 of the control valve 20 enters the atmosphere through the discharge port 32 while the status valve 14 is in the raised position. While in the lowered position (see FIGURE 2), the status valve 14 substantially restricts fluid communication between the outlet side 24 of the conirol valve 20 and the inlet of the compressor 23. Likewise, any air in The excess supplied to the outlet side 24 of the control valve 20 is vented to the discharge port 32. Furthermore, in one embodiment, the status valve 14 reduces an orifice 40 between the control valve 14 and the inlet of the compressor 28 of the control valve. so that only a small portion of the pressure supplied to the outlet side 24 of the control valve 20 is supplied to the inlet of the compressor 28 to minimize the pressure at the inlet of the compressor 28. Therefore, the Valve 14 acts as a means to reduce the pressure at the inlet of the compressor 28. The excess pressure fluid is passed to the discharge port 32 and discharged (purged) to the atmosphere. was through the restriction device 34. As described above, a position of the status valve 14 controls fluid communication between the inlet of the compressor 28, the discharge port 32, and the outlet side 24 of the valve of control 20.

The control valve 20 reduces the pressure on the outlet side 24 compared to the pressure on the inlet side 22- In one embodiment, the reduction in pressure on the outlet side 24 is proportional to the velocity of the net mass flow which passes through the control valve 20. More specifically, the pressure on the outlet side 24 increases as the mass flow velocity on the outlet side 24 increases- In other words, the pressure on the outlet side 24 decreases as the mass flow of the fluid pressure on the inlet side 22- increases since the mass flow velocity is determined largely by the upstream pressure at 22 and the compressor rotation speed, the pressure reduction will be lower at lower upstream pressures and lower rotational speeds and higher at higher upstream pressures and high rotational speeds. For the reasons described above, the control valve 20 acts as a means for regulating the pressure supplied to the inlet of the compressor 28 as a function of an inlet pressure on the inlet side 22, the position of the status valve 14, and the mass flow velocity. In addition, in one embodiment, the control valve 20 is a tab valve. However, other modalities that include other types of control valves are also considered. For example, it is also considered that the Control valve 20 is an inlet regulating valve. Alternatively, it is also contemplated that the control valve 20 be of any type of pressure-sensitive inlet regulating valve. The control valve 20 controls the amount of pressure supplied to the outlet side 24 as a function of the pressure in the inlet 22 and the rotational speed of the compressor. In one embodiment, the pressure at the inlet side 22 is proportional to a manifold pressure of the engine. The control valve 20 operates to control the amount of pressure of the engine manifold on the inlet side 22 which is supplied to the outlet side 24. The pressure supplied on the outlet side 24 of the valve ran as described above. control 20 is inversely proportional to the mass flow through the valve 20. Therefore, when the compressor 12 is operating in the "charging" mode, the pressure on the inlet side 22 is increased by the fluid which is extracted inside the compressor and, in addition, decreases the amount of pressure supplied from the inlet side 22 to the outlet side 24. For example, in the above-described embodiment in which the control valve 20 is a tab valve, the Control mechanism 26 of the tongue valve moves closer to a valve plate 42 in the output ladp 24 as the mass flow rate increases. The same effect is achieved as the fluid is drawn into the inlet of the compressor 28. It is realized that the mass flow in 22 and 24 must always be equal due to the continuity of the law of the mass. If the mass flow rate is zero (0), there is no movement of the tongue 26 towards the plate 42. Therefore, the tongue closes more and more as the mass flow rate increases. As discussed above, the input control device 10 illustrated in FIGURE 1 is in the raised position when the compressor is in the "load" or "on load" operating mode. In addition, the input control device 10 illustrated in FIGURE 2 is in the lowered position when the compressor is in the "unloaded" or "unloaded" operating mode. Therefore, similar components are designated using the same reference numerals in both FIGURES 1 and 2. While the present invention has been illustrated by means of the description of the embodiments thereof, and while the modalities in considerable detail, it is not the intent of the applicants to restrict or limit in any way the scope of the appended claims to such detail. The advantages and additional modifications will be readily apparent to those skilled in the art. Therefore, the invention, in its broader aspects, is not limited to the specific details, the representative apparatus and the illustrative examples shown and described. Accordingly, deviations can be made from those details without departing from the spirit or scope of the applicant's general inventive concept.

Claims

CLAIMS 1. An input control device, comprising: a status valve positioned as a function of a status of a state of a compressor; and a tongue valve for supplying a tongue outlet pressure to an inlet of the compressor as a function of a tongue inlet pressure on an inlet side of the tongue valve, the status valve position, and a O rotational speed of the compressor. 2. The input control device according to claim 1, characterized in that the status valve includes a piston, which is positioned as a function of the state of the compressor. 3. The input control device according to claim 1, characterized in that the status valve is positioned to cause substantially all of the tab output pressure to be supplied to the compressor inlet when the compressor is in the charged state . 4. The input control device according to claim 3, characterized in that the status valve is positioned to cause a portion of a tab exit pressure to be discharged into the atmosphere when the compressor is in the discharged state. 5. The input control device according to claim 4, characterized in that the status valve causes a portion of a tab exit pressure to pass to the compressor inlet when the compressor is in the discharged state to reduce a pressure at the compressor inlet. The input control device according to claim 4, further including: a restriction device for purging the portion of a tab exit pressure to the atmosphere. The input control device according to claim 1, characterized in that the tongue valve causes a tongue outlet pressure to decrease as the tongue input pressure and the rotational speed of the compressor increase. The input control device according to claim 6, characterized in that the tongue valve causes a tongue outlet pressure to decrease as a mass flow of the tongue inlet pressure increases. 9. An input control device, comprising: a valve positioned as a function of a status of a state of a compressor; and means for regulating a pressure supplied to a compressor inlet as a function of a mass flow and the position of the valve. 10. The input control device according to claim 9, characterized in that the means for regulation include: a valve that regulates the pressure supplied as inversely proportional to the mass flow. 1. The input control device according to claim 10, characterized in that the means for regulation are a tab valve. The input control device according to claim 9, characterized in that: the valve is fixed to a first position when the compressor is in the loaded state; and the valve is fixed to a second position when the compressor is in the discharged state. The input control device according to claim 12, characterized in that the valve substantially regulates all the pressure supplied to be supplied to the compressor inlet when the valve is in the first position, which further includes: means for reducing a pressure at the compressor inlet when the valve is fixed in the second position. The input control device according to claim 13, characterized in that the means for reduction include: the valve that regulates a portion of the pressure supplied to pass to the compressor inlet. 15. A system for controlling an inlet pressure to a compressor, the system comprising: a port of entry to the compressor; a port of discharge; a valve that includes a valve inlet and a valve outlet; and a piston, positioned as a function of a state of the compressor, to control the fluid communication between the valve and the discharge port, a pressure at the valve outlet that is s, um, entered at the inlet port of the valve. compressor as a function of a pressure at the valve inlet of the piston position. 16. The system for controlling an inlet pressure for a compressor according to claim 15, further including: a pressure restrictor in the discharge port for purging a portion of (at valve outlet pressure to the atmosphere when the The compressor is in the unloaded state 17. The system for controlling an inlet pressure for a compressor according to claim 16, characterized in that the valve causes a portion of the valve outlet pressure to pass to the compressor inlet when the The compressor is in the discharged state to reduce a pressure at the inlet of the compressor 18. The system for controlling an inlet pressure for a compressor according to claim 1 5, characterized in that: the piston is positioned to create free communication of the compressor. fluid between the valve outlet and the compressor inlet port when the compressor is in the discharged state; the piston is positioned to create substantially restricted fluid communication between the valve outlet and the discharge port when the compressor is in the charged state. 1 9. The system for controlling an inlet pressure for a compressor according to claim 1 5, characterized in that the valve is a tab valve, 20. The system for controlling an inlet pressure for a compressor in accordance with Claim 1 5, characterized in that the valve causes the output pressure of the valve to decrease as a mass flow of the valve inlet pressure increases. twenty-one . Uh compressor, comprising: a compressor inlet port; a compressor discharge port; a status valve fixed to a loaded operating position and a discharged operating position; a control valve that includes an input port and an output port, the control valve output port that communicates fluidly with the compressor input port and the discharge port as a function of the position of the valve status. 22. The compressor according to claim 21, characterized in that: the compressor input port communicates fluidly with the control valve output port when the status valve is set in the loaded operating position; and ^ the compressor inlet port does not communicate fluidly with the compressor discharge port when the status valve is set in the loaded operation position. 23. The compressor according to claim 22, characterized in that: the fluid communication between the inlet port of the compressor and the outlet port of the control valve is substantially restricted when the status valve is fixed to the operating position. downloaded; and the compressor inlet port communicates fluidly with the compressor discharge port when the status valve is set to the discharged operating position. The compressor according to claim 21, characterized in that the control valve causes a pressure at the outlet port of the control valve to decrease as a pressure increases at the inlet port of the control valve. 25. The compressor according to claim 21, characterized in that the control valve is a tab valve. 26. A method for controlling a pressure supplied to a compressor inlet, the method that includes: placing a valve as a function of a state of the compressor; and regulate the pressure delivered to the compressor inlet as a function of an inlet pressure and the position of the valve. 27. The method for controlling a pressure supplied to a compressor inlet according to claim 26, characterized in that the positioning includes: placing the valve to create unrestricted fluid communication from the inlet pressure to the compressor inlet when the compressor It is in the loaded state. 28. The method for controlling a pressure supplied to a compressor inlet according to claim 27, characterized in that, when the compressor is in the discharged state, the positioning further includes: placing the valve to create fluid communication restricted from the pressure input to the compressor input; and place the valve to vent the inlet pressure. 29. The method for controlling a pressure supplied to a compressor inlet according to claim 26, characterized in that the positioning includes: reducing an orifice through which the pressure supplied to the compressor inlet passes when the compressor is in the condition Discharged. 30. The method for controlling a pressure supplied to a compressor inlet according to claim 26, characterized in that the regulation includes: decreasing the pressure supplied to taedida that the inlet pressure increases.