Fluid supply system

Abstract

A fluid supply system with a component includes a first bypass valve arranged in a control channel with a valve body adjustable at least between a first and a second position. The valve body separates the control channel into a first and a second space and has a leakage opening connecting the first space to the second space. The second space is connected to a fluid reservoir via a leakage channel, and a switchable valve is arranged in the leakage channel. A sensing device is configured to sense a property of the fluid and convey the property to a controlling device that is configured to close the valve to block the leakage channel when a predefined property is reached. A second bypass valve is configured to reduce a transient oscillation of the first bypass valve during a starting of the system.

Claims

1. A fluid supply system with a component, the fluid supply system comprising: a first bypass valve arranged in a control channel with a valve body adjustable at least between a first and a second position, wherein the valve body separates the control channel into a first and a second space and has a leakage opening connecting the first space to the second space, wherein the second space is connected to a fluid reservoir via a leakage channel, a switchable valve arranged in the leakage channel and wherein the switchable valve is configured to at least partially open the leakage channel and at least partially close the leakage channel, a sensing device configured to sense a property of the fluid and convey the property to a controlling device, wherein the controlling device is configured to close the valve to block the leakage channel when a predefined property is reached, a second bypass valve configured to reduce a transient oscillation of the first bypass valve during a starting of the system, wherein the second bypass valve is arranged in the leakage opening of the valve body, wherein the second bypass valve has a spring-loaded valve body arranged in the leakage opening, wherein the spring-loaded valve body is prestressed with a sealing element tightly against an edge of the leakage opening, and wherein the spring-loaded valve body has a throttle opening smaller than the leakage opening.

2. The fluid supply system according to claim 1, wherein the sensing device is configured as a temperature sensing device and the controlling device is configured to close the valve on reaching a temperature (T) of T>117 C.

3. The fluid supply system according to claim 1, wherein the component is configured as one of a cooler, a gear, and a filter device.

4. The fluid supply system according to claim 1, wherein the fluid supply system is configured as a lubricant supply system.

5. The fluid supply system according to claim 1, wherein the fluid supply system has a fluid channel formed therein; and wherein the fluid supply system has a bypass channel formed therein.

6. The fluid supply system according to claim 5, wherein the valve body has a shell-side first opening formed therein; and wherein the valve body has a shell-side second opening formed therein.

7. The fluid supply system according to claim 6, wherein the shell-side first opening is aligned with the bypass channel when the valve body is positioned in the first position.

8. The fluid supply system according to claim 7, wherein the shell-side first opening is configured to block passage of the fluid from the first space into the fluid channel when the valve body is positioned in the first position.

9. The fluid supply system according to claim 7, wherein the shell-side second opening is aligned with the fluid channel when the valve body is positioned in the second position.

10. The fluid supply system according to claim 9, wherein the shell-side second opening is configured to block passage of the fluid from the first space into the bypass channel when the valve body is positioned in the second position.

11. An internal combustion engine with a fluid supply system having a component, the fluid supply system comprising: a first bypass valve arranged in a control channel with a valve body adjustable at least between a first and a second position, wherein the valve body separates the control channel into a first and a second space and has a leakage opening connecting the first space to the second space, wherein the second space is connected to a fluid reservoir via a leakage channel, a switchable valve arranged in the leakage channel and wherein the switchable valve is configured to at least partially open the leakage channel and at least partially close the leakage channel, a sensing device configured to sense a property of the fluid and convey the property to a controlling device, wherein the controlling device is configured to close the valve to block the leakage channel when a predefined property is reached, a second bypass valve configured to reduce a transient oscillation of the first bypass valve during a starting of the system, wherein the second bypass valve is arranged in the leakage opening of the valve body, wherein the second bypass valve has a spring-loaded valve body arranged in the leakage opening, wherein the spring-loaded valve body is prestressed with a sealing element tightly against an edge of the leakage opening, and wherein the spring-loaded valve body has a throttle opening smaller than the leakage opening.

12. The fluid supply system according to claim 11, wherein the sensing device is configured as a temperature sensing device and the controlling device is configured to close the valve on reaching a temperature (T) of T>117 C.

13. The fluid supply system according to claim 11, wherein the component is configured as one of a cooler, a gear, and a filter device.

14. The fluid supply system according to claim 11, wherein the fluid supply system is configured as a lubricant supply system.

15. The internal combustion engine according to claim 11, wherein the fluid supply system has a fluid channel formed therein; and wherein the fluid supply system has a bypass channel formed therein.

16. The internal combustion engine according to claim 15, wherein the valve body has a first opening formed therein; and wherein the valve body has a second opening formed therein.

17. The internal combustion engine according to claim 16, wherein the first opening is aligned with the bypass channel when the valve body is positioned in the first position.

18. The internal combustion engine according to claim 17, wherein the first opening is configured to block passage of the fluid from the first space into the fluid channel when the valve body is positioned in the first position.

19. The internal combustion engine according to claim 17, wherein the second opening is aligned with the fluid channel when the valve body is positioned in the second position.

20. The internal combustion engine according to claim 19, wherein the second opening is configured to block passage of the fluid from the first space into the bypass channel when the valve body is positioned in the second position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) There are shown here, respectively diagrammatically:

(2) FIG. 1 illustrates a fluid supply system according to the invention with a fluid property below a predefined property, having a second bypass valve integrated into the first bypass valve,

(3) FIG. 2 illustrates an illustration as in FIG. 1, but with a property of the fluid above the predefined property,

(4) FIG. 3 illustrates a detail illustration of the second bypass valve according to FIGS. 1 and 2,

(5) FIG. 4 illustrates an embodiment having a second bypass valve not arranged on the valve body of the first bypass valve,

(6) FIG. 5 illustrates an alternative embodiment to FIG. 4.

DETAILED DESCRIPTION

(7) According to FIGS. 1, 2 (according to the invention) and 4 and 5, a fluid supply system 1, in particular of an internal combustion engine 2, for example a lubricant supply system and in particular an oil supply system 3, has a component 5 and a bypass 4 bypassing this. The component 5 can be configured for example as a cooler, a gear or a filter device. According to FIGS. 1, 2, 4 and 5, only the fluid channel 21 to the component 5 and the bypass channel 22 to the bypass 4 are shown here, so that the actual component 5 is situated below the illustrated image plane. In a control channel 6 a first bypass valve 7 with a valve body 8 is arranged here, which is adjustable between a first position (cf. FIG. 1) and a second position (cf. FIGS. 2, 4 and 5), and which in the first position blocks off the fluid channel 21 to the component 5, and in the second position blocks off the bypass channel 22, or vice versa. The control channel 6 leads here indirectly via a fluid pump, which is not shown, to a fluid reservoir 9. In FIG. 1 the valve body 8 is arranged above in the first position, whereas in FIGS. 4 and 5 it is arranged below in the first position, and vice versa. For this reason, in FIGS. 1, 2 and 4 and 5 a spring element 13 is embodied here as a compression spring.

(8) Observing the control channel 6 more closely, it can be seen that the valve body 8 divides the control channel 6 into a first space 10 and a second space 11 and, at the same time, has a leakage opening 12 which connects the first space 10 with the second space 11. In the second space 11, furthermore, the spring element 13 is arranged, which prestresses the valve body 8 into its second position illustrated according to FIGS. 2, 4 and 5. The second space 11 is, furthermore, connected to the fluid reservoir 9 via a leakage channel 14, wherein in the leakage channel 14 a valve 15, in particular a solenoid valve, is arranged for at least partially opening/closing the leakage channel 14. According to FIGS. 1, 4 and 5, the valve 15 is shown here in its open position, in which the second space 11 is connected via the leakage channel 14 with the fluid reservoir 9, which is pressureless. By comparison, FIG. 2 shows the valve 15 in its closed position. Generally here, the valve 15 can have a solenoid valve, an electric switch, a bimetal and/or an expansion element 23. Particularly the embodiment as a solenoid valve, as a bimetal or as an electric switch enables a comparatively rapid switching and thereby a rapid reaction.

(9) Furthermore, the fluid supply system 1 according to the invention has a sensing device 16, for example a temperature sensing device with a temperature sensor, which detects a property, in particular the temperature, of the fluid 17, for example oil or lubricant, and conveys it to a controlling device 18, which in turn is configured in such a manner that it closes the valve 15 on reaching of a predefined property, for example a predefined temperature T, and thereby blocks the leakage channel 14. For this purpose, the controlling device 18 is of course also connected to the valve 15. The sensing device 16 and the controlling device 18 can of course also be combined here in an expansion element 23.

(10) In FIGS. 1 and 2, the sensing device 16 is configured as a temperature sensing device and consequently detects the temperature of the fluid 17. The predefined temperature T can lie here for example at 117 C., so that according to FIG. 1 a state of the fluid supply system 1 according to the invention is shown at a temperature T<117 C., and according to FIG. 2 at a temperature T117 C.

(11) Observing the valve body 8 according to FIGS. 1 to 3 more closely, it can be seen that the latter is configured as a valve piston which has a shell-side first opening 19 and a shell-side second opening 20, wherein according to the switching position of the valve body 8, the first opening 19 is aligned with the bypass channel 22 to the bypass 4, or the second opening 20 is aligned with the fluid channel 21 to the component 5. The openings 19, 20 are arranged around the centre axis of the valve body 8 at the same height. On displacement of the valve piston, the openings 19, 20 travel, so that they either free the channel 21 or 22. In the case of the valve body 8 according to FIGS. 4 and 5, the valve body 8 has only one shell-side opening 19. The leakage opening 12 is arranged here in a base of the valve body 8. The valve piston itself can be made from metal or from plastic, wherein the construction from metal offers a particularly high resistance with respect to all fluids 17, whereas an embodiment from plastic can be produced at a comparatively favourable cost.

(12) The fluid supply system 1 according to the invention functions here, with a sensing device 16 configured as a temperature sensing device, as follows:

(13) At a temperature T<117 C. the situation illustrated according to FIG. 1 occurs, in which the temperature sensing device 16 detects the temperature, passes it on to the controlling device 18 and the latter thereupon keeps the valve 15 open. The fluid 17 flowing into the control channel 6 therefore generates a pressure P.sub.1 in the first space 10, wherein it can flow via the throttle opening 25 into the second space 11 and via the latter and the opened leakage channel 14 into the fluid reservoir 9. The second bypass valve 26 only opens at particular operating states and frees the leakage opening 12. The fluid reservoir 9 is usually pressureless here, wherein, however, a valve body 8a of the valve 15 can be configured for example as a throttle, so that in the second space 11 the ambient pressure does not occur, but rather merely a pressure P.sub.2 which is reduced with regard to the pressure P.sub.1 prevailing in the first space 10. Between the first space 10 and the second space 11 therefore a pressure difference P occurs, which counteracts the elastic force of the spring element 13. The force F.sub.1 acting from below onto the valve body 9 in the present case is measured here at
F.sub.1=P.Math.A.sub.(valve body)P.Math.A.sub.(valve body)
whereas the force F.sub.2 acting from above onto the valve body 8 is measured as follows:
F.sub.2=P.Math.A.sub.(valve body)+F.sub.spring
and wherein
F.sub.1>F.sub.2.

(14) Hereby, the valve body 8 moves upwards, until the first shell-side opening 19 is aligned with the bypass channel 22 leading to the filter device 4 and the fluid 17 can flow into the bypass 4. A small leakage flow of the fluid 17 can also arrive via the throttle opening 25 into the second space 11 and via the leakage channel 14 into the fluid reservoir 9.

(15) On reaching the predefined temperature T of 117 C., the first bypass valve 7 switches comparatively quickly into the position illustrated according to FIG. 2, because on reaching the predefined temperature T the controlling device 18 conveys a corresponding signal to the valve 15 and the latter thereupon transfers the valve body 8a into its closed position and quickly blocks the leakage channel 14. As the leakage channel 14 has a distinctly reduced cross-section compared to the control channel 6, here also a valve 15 can be used having only a small valve stroke but, at the same time, switching quickly. After the closing of the valve 15, the pressure P.sub.2 in the second space 11 rises to the pressure P.sub.1 in the first space 10, from which a P of zero results. In this case, therefore, no more pressure-dependent adjustment of the valve body 8 of the first bypass valve 7 occurs at all, because the force F.sub.1 acting from below onto the valve body 8 in a pressure-caused manner corresponds to the exclusively pressure-caused force F from above onto the valve body 8. Nevertheless, of course, the force F.sub.2 acting from above onto the valve body 8 is greater than the force F.sub.1, because from above in addition also the force F.sub.(spring) of the spring element 13 acts on the valve body 8. Therefore, the following applies for the state illustrated according to FIG. 2:
F.sub.2>F.sub.1 with
F.sub.2=P.Math.A.sub.(valve body)+F.sub.spring; and F1=P.Math.A.sub.(valve body)

(16) With the first bypass valve 7 according to the invention and the fluid supply system 1 according to the invention, a controlling of the valve body 8 of the first bypass valve 7 is possible via the elastic force F.sub.spring via the fluid pressure P.sub.1, P.sub.2 and via the position of the valve body 8a of the valve 15. Depending on whether the valve 15 is open or closed, via a targeted configuration of the elastic force F.sub.(spring) of the spring element 13, the valve body 8 can open or respectively close the bypass channel 22 to the bypass 4.

(17) Observing the fluid supply system 1 according to FIGS. 1 to 3, it can be seen that the second bypass valve 26 is arranged at/in the leakage opening 12 of the valve body 8. The second bypass valve 26 has, in addition, a spring-loaded valve body 8b, which is arranged in the leakage opening 12 and is prestressed with a sealing element 24 tightly against the leakage opening 12. The valve body 8b of the second bypass valve 26 has a throttle opening 25, which is smaller than the leakage opening 12. Hereby, in particular a rapid draining of the fluid 17 from the space 11 after the stoppage of the internal combustion engine 2 can be prevented.

(18) Observing the fluid supply system 1 according to FIGS. 4 and 5, it can be seen that the second bypass valve 26 is arranged in the region of the valve 15. Here, the second bypass valve 26 according to FIG. 4 has a spring-prestressed cylinder-like valve body 8c, which has a circumferential annular groove 27 in which the oil can flow around the valve body 8c and can flow into the leakage channel 14 to the fluid reservoir 9. Furthermore, the valve body 8c also has in addition an opening 32 arranged in the annular groove 27, which penetrates the valve body 8c, and a face-side opening 28.

(19) In the embodiments of the valve 15 according to FIGS. 4 and 5, the second bypass valve 26 has an expansion element 23 and, according to FIG. 4, a plunger 29 coupled therewith, which on exceeding of a predefined property of the fluid 17 closes the face-side opening 28 and thereby blocks the leakage channel 14, which in this case runs through the valve body 8c.

(20) The spring-prestressed cylinder-like valve body 8c is prestressed against a valve seat 30 and is configured such that it rises from the valve seat 30 in a pressure-dependent manner and thereby opens the second bypass valve 26.

(21) In the case of the bypass valve 26 according to FIG. 5, this has a spring-prestressed cylinder-like valve body 8d with an annular shoulder 31 and is configured such that it frees, in a pressure-dependent manner, a balancing channel 33 connecting the second space 11 with the control channel 6, and thereby opens the second bypass valve 26.

(22) Irrespective of the respectively selected embodiment of the second bypass valve 26, this makes possible, on a renewed starting of the internal combustion engine 2 with, at the same time an empty space 11, a rapid filling thereof and thereby a rapid proper operation.

(23) In so far as the valve 15 is constructed as a solenoid valve or as an electrically switchable valve, it can of course be configured such that it fulfils a so-called failsafe function, i.e. it must be supplied with current in order to be transferred into the (open) state illustrated in FIG. 1. The valve 15 remains currentless in the closed state, so that the fluid 17 or respectively the oil is always directed via the component 5, and damage can be prevented.

(24) The predefined temperature T=117 C. illustrated in FIGS. 1 and 2 of course only represents a possible temperature which applies for example for oil as fluid 17. Other parameters can of course also serve as detection value.

(25) With the fluid supply system 1 according to the invention, therefore, a comparatively rapid switching of the first bypass valve 7 is possible, without an actuating device having a comparatively large valve stroke being necessary for this, because the valve stroke of the valve 15 for controlling the valve body 8 in the leakage channel 14 is entirely sufficient in order to influence the pressure conditions P.sub.1, P.sub.2 and thereby to control the first bypass valve 7.