Fluid transport system in which the rotational speed of a rotary pump varies with the load

Abstract

A fluid delivery system includes a reservoir (6) for storing fluid, a rotary pump (5) having a first pump port (51) and a second pump port (52), a first fluid passage (1) connecting the first pump port (51) to the reservoir, and a second fluid passage (2) connecting the second pump port (52) to the reservoir. The rotary pump (5) rotates in a first delivery direction in a normal mode and in a second delivery direction in an alternative mode. When the rotary pump is in its alternative mode, a first valve (11) separates the first pump port (51) from the reservoir (6), and when the rotary pump is in its normal mode, a second valve (21) separates the second pump port (52) from the reservoir.

Description

Technical Field

[0001] This invention relates to a fluid delivery system for supplying fluid to mechanical components, particularly the engine or transmission system of a motor vehicle. The invention particularly relates to supplying oil to mechanical components for lubrication and / or cooling. The fluid delivery system includes a reservoir for storing fluid and a rotary pump for drawing fluid from the reservoir and delivering it to the mechanical components. Background Technology

[0002] Typical fluid delivery systems for supplying fluid to mechanical components (especially in the field of motor vehicles for supplying fluid to engines or transmissions) are generally based on forced-feed lubrication (especially wet-sump lubrication) that uses at least one pump to deliver fluid (especially oil) to the relevant location. In typical wet-sump lubrication, as fluid is discharged from the mechanical component, it is collected in a reservoir located below the mechanical component and pumped out of the reservoir and returned to the mechanical component.

[0003] Such fluid delivery systems, including wet tanks, have the disadvantage of drawing in air, for example, under extreme driving conditions of a motor vehicle. For instance, maneuvers such as cornering and / or rapid acceleration or braking from high speeds generate centrifugal force, which forces oil out of the suction point within the reservoir, causing both oil and air to be drawn in at that point simultaneously, or only air. This can lead to an interruption of the fluid supply to mechanical components, and depending on the duration of the interruption and the temperature and / or condition of the mechanical components (particularly the vehicle's engine), can have fatal consequences. In the worst case, this can result in damage to the vehicle's engine and / or transmission system.

[0004] Therefore, alternatives to typical wet tank lubrication have been developed to prevent air from being drawn in. Prior art also discloses, for example, fluid delivery systems in which fluid can be drawn from a reservoir at multiple spaced-apart suction locations via multiple pumps within the reservoir. Thus, wet tank lubrication, for example, using multiple pumps distributed within the reservoir, always ensures that at least one pump draws in fluid and delivers it to the mechanical components.

[0005] Existing technologies also disclose fluid delivery systems, particularly wet-tank lubrication fluid delivery systems, in which the reservoir includes so-called baffles (especially baffles or partitions) to prevent fluid from being forced away from the suction position when large centrifugal forces occur (especially high lateral accelerations, for example, during cornering). In addition to the partitions, it has proven valuable to form the pump and / or suction position at a very low location within the reservoir (e.g., implemented as a funnel-shaped recess in the reservoir) so that, even under extreme driving conditions, the region of the suction position is always provided with as much fluid as possible.

[0006] One drawback of traditional wet groove lubrication is that implementing the reservoir as a recess along with other components requires a significant amount of space, particularly in the vertical direction. This means that engines with integrated wet groove lubrication must be mounted relatively high within the vehicle to allow sufficient space for the reservoir. Consequently, vehicles with wet groove lubrication features have a relatively high center of gravity, which negatively impacts vehicle handling.

[0007] For example, if the turn lasts for a long time, even a baffle cannot completely prevent the fluid from being forced away from the suction position. If multiple pumps are used, the recess in the reservoir can usually be omitted; however, using multiple pumps is expensive and will result in high energy requirements for operating these pumps.

[0008] Therefore, so-called dry-sump lubrication has been developed as an alternative to wet-sump lubrication. This is particularly useful in high-performance engines and / or off-road or sports vehicles. Dry-sump lubrication involves drawing fluid from an auxiliary oil sump, and after the fluid is supplied to the mechanical components, the fluid is pumped back to the auxiliary oil sump and then fed to the main oil sump. The main oil sump is then used to supply fluid to the mechanical components by drawing fluid from it using another pump and supplying it to the mechanical components.

[0009] The advantages of dry-slot lubrication include its reliable lubrication of mechanical components because it is less affected by centrifugal force, and the oil is actively supplied to the suction position of the main oil tank. Furthermore, the large main oil tank improves fluid cooling, and the flat auxiliary oil tank below the mechanical components reduces the overall height of the components, thus lowering the vehicle's center of gravity. This is particularly advantageous for low-profile vehicles such as sports cars. Moreover, since the fluid from the mechanical components is initially drained into the auxiliary oil tank and actively transported to the main oil tank, the main oil tank can be installed in any location.

[0010] Forced-feed lubrication is highly reliable in supplying fluid to mechanical components, but it is prone to failure due to the large number of additional components and is particularly expensive because, in addition to the additional pump that delivers fluid from the auxiliary oil tank to the main oil tank, dry-tank lubrication requires another reservoir. Dry-tank lubrication typically also requires a larger overall space than wet-tank lubrication, especially due to the main oil tank. Summary of the Invention

[0011] Therefore, the object of the present invention is to provide a fluid delivery system that reliably prevents air from being drawn in and can be manufactured in a space-saving and inexpensive manner.

[0012] This objective is achieved by the fluid delivery system according to claim 1 and the method for operating the fluid delivery system according to claim 15.

[0013] A fluid delivery system for supplying fluid to mechanical components (particularly the engine or gear system of a motor vehicle) includes a reservoir for storing the fluid. This fluid delivery system is preferably a forced-supply lubricating fluid delivery system, particularly a wet-slot lubricating fluid delivery system. Specifically, the fluid delivery system is not a dry-slot lubricating fluid delivery system. The fluid delivery system is preferably a wet-slot lubricating fluid delivery system for the engine of a motor vehicle. The fluid may be oil used for lubricating and / or cooling the mechanical components.

[0014] The reservoir can be implemented as a flat reservoir. The reservoir can particularly have a length that is many times, and especially twice, greater than its width. When the reservoir is installed, especially in a motor vehicle, its width and length preferably extend horizontally. Preferably, the depth of the reservoir is several times smaller than its length and (preferably) its width, particularly half the length. When the reservoir is installed, especially in a motor vehicle, its depth preferably extends vertically. Preferably, the reservoir has a range greater than its depth in both the longitudinal and width directions. In particular, the reservoir can be implemented in the form of a flat plate.

[0015] The reservoir may have an opening on the side facing the mechanical assembly, through which fluid may flow from the mechanical assembly back to the reservoir. The reservoir may be located below the mechanical assembly. The reservoir may be located at the lowest position of the mechanical assembly. The reservoir may be connected to the housing of the mechanical assembly, particularly via a threaded connection. The reservoir may be part of the housing of the mechanical assembly.

[0016] In a preferred embodiment, the reservoir is an oil pan of the motor vehicle, which is located at the lowest point of the motor vehicle's engine. Specifically, the reservoir is preferably connected (particularly by a threaded connection) to the crankcase of the motor vehicle's engine.

[0017] The reservoir can be made of metal or plastic, particularly by original molding or re-forming methods. Preferably, the reservoir can be manufactured by re-forming (especially deep drawing). In alternative embodiments, the reservoir can be manufactured by original molding methods (especially casting). In a preferred embodiment, the reservoir is made from sheet metal (especially sheet metal) by deep drawing.

[0018] In an alternative embodiment, the reservoir can be manufactured using a bonding method (particularly a thermal bonding method). The reservoir can then, for example, be made from multiple sheets (particularly metal sheets) welded together. The reservoir may also include a substrate manufactured by an original molding or reforming method and integrally joined with additional components, such as sheets, by a joining method.

[0019] The fluid delivery system further includes a rotary pump having a first pump port and a second pump port. This rotary pump can be, for example, configured as a vane pump, a rocker-slider pump, or a gear pump. The fluid delivery system also includes a driver for the rotary pump. The driver can be, for example, configured as an electric motor. In an alternative embodiment, the rotary pump can be driven by a mechanical component to which fluid is supplied, wherein a transmission system for transmitting rotational speed and / or rotational direction is preferably arranged between the mechanical component and the rotary pump. Preferably, the transmission system can be designed to change the delivery direction of the rotary pump independently of the initial rotational direction.

[0020] The rotary pump can operate in a normal mode and an alternative mode. In its normal mode, the rotary pump (particularly the impeller) rotates along a first delivery direction; while in its alternative mode, the rotary pump (particularly the impeller) rotates along a second delivery direction. The second delivery direction can be opposite to the first delivery direction. The rotary pump can switch between its alternative mode and normal mode. In particular, the delivery direction of the rotary pump can be controlled so that the rotary pump can switch between its normal mode and alternative mode.

[0021] A rotary pump is designed to draw fluid from a reservoir and discharge it to a mechanical component, regardless of its operating state. The rotary pump can draw fluid from the reservoir in both its normal and alternative modes. The rotary pump can be disposed within the reservoir. In an alternative embodiment, the rotary pump can be disposed outside the reservoir and connected to the reservoir, for example, via a fluid passage. After the fluid has, for example, lubricated and / or cooled the mechanical component, it can flow back from the mechanical component to the reservoir. Thus, the fluid delivery system represents a fluid loop.

[0022] Depending on the pumping direction of the rotary pump, the first pump port can form either the inlet (particularly the casing inlet) or the outlet (particularly the casing outlet) of the rotary pump. Furthermore, depending on the pumping direction of the rotary pump, the second pump port can also form either the inlet (particularly the casing inlet) or the outlet (particularly the casing outlet) of the rotary pump.

[0023] When the rotary pump is in its normal operating mode, the first pump port preferably forms the pump inlet. When the rotary pump is in its normal operating mode, the first pump port is particularly located on the low-pressure side of the rotary pump. Correspondingly, when the rotary pump is in its normal operating mode, the second pump port preferably forms the pump outlet of the rotary pump. When the rotary pump is in its normal operating mode, the second pump port is particularly located on the high-pressure side of the rotary pump.

[0024] When the rotary pump is in its alternative mode, the second pump port preferably forms the pump inlet. When the rotary pump is in its alternative mode, the second pump port is particularly implemented on the low-pressure side of the rotary pump. Correspondingly, when the rotary pump is in its alternative mode, the first pump port preferably forms the pump outlet of the rotary pump. When the rotary pump is in its alternative mode, the first pump port is particularly implemented on the high-pressure side of the rotary pump.

[0025] When the rotary pump is in its normal mode, it can draw fluid from the reservoir through the first pump port. When the rotary pump is in its normal mode, it can also discharge fluid through the second pump port. When the rotary pump is in its alternative mode, it can draw fluid from the reservoir through the second pump port. When the rotary pump is in its alternative mode, it can also discharge fluid through the first pump port.

[0026] A fluid delivery system may include a first fluid passage equipped with a first valve and a second fluid passage equipped with a second valve. Regardless of whether the rotary pump is arranged inside and / or outside the reservoir, the fluid delivery system may include a first fluid passage equipped with a first valve and a second fluid passage equipped with a second valve. The first fluid passage connects a first pump port to the reservoir, and the second fluid passage connects a second pump port to the reservoir. The first fluid passage may extend specifically from the first pump port to a first suction position within the reservoir. The first fluid passage preferably connects the first pump port directly to the reservoir via the first valve. The second fluid passage may extend specifically from the second pump port to a second suction position within the reservoir. The second fluid passage preferably connects the second pump port directly to the reservoir via the second valve.

[0027] When the rotary pump is in its normal mode, the second valve can disconnect the second pump port from the reservoir. When the rotary pump is in its normal mode, the second valve can specifically close the second fluid passage. When the rotary pump is in its alternative mode, the first valve can disconnect the first pump port from the reservoir. When the rotary pump is in its alternative mode, the first valve can specifically close the first fluid passage.

[0028] When the rotary pump is in its normal mode, it can draw fluid through the first pump port and discharge fluid through the second pump port. When the rotary pump is in its alternative mode, it can draw fluid through the second pump port and discharge fluid through the first pump port.

[0029] The first fluid channel preferably emerges into the reservoir at the first suction position. The second fluid channel preferably emerges into the reservoir at the second suction position. The first and second suction positions may be spaced apart from each other. The first and second suction positions may be spaced apart from each other, particularly in the horizontal direction of the reservoir, especially when the reservoir is installed. Preferably, the first and second suction positions are spaced apart from each other in the longitudinal direction of the reservoir. The first and second suction positions may be configured to be flush with each other in the reservoir. The first and second suction positions may be flush with each other, particularly in the vertical direction of the reservoir, especially when the reservoir is installed. In an alternative embodiment, the first and second suction positions may be configured not to be flush with each other in the reservoir. Preferably, the first and second suction positions are configured such that they are spatially separated from each other within the reservoir.

[0030] Preferably, a first valve is implemented between the first pump port and the first suction position. The first valve can be implemented in the region of the first suction position. The first valve can particularly be located at the end of the first fluid passage facing the reservoir. Preferably, a second valve is implemented between the second pump port and the second suction position. The second valve can be implemented in the region of the second suction position. The second valve can particularly be located at the end of the second fluid passage facing the reservoir.

[0031] The reservoir may include a main oil tank and an auxiliary oil tank. The reservoir may also include an overflow portion, through which the main oil tank and the auxiliary oil tank are fluidly connected to each other. In a preferred embodiment, fluid flows from the engine assembly back to the main oil tank. In an alternative embodiment, fluid may flow from the engine assembly back to both the main oil tank and the auxiliary oil tank.

[0032] Fluid can also flow from the main oil tank to the auxiliary oil tank via an overflow and / or from the auxiliary oil tank to the main oil tank via an overflow. The overflow can be formed as a partition wall in the reservoir, extending in the depth direction of the reservoir less than the depth of the reservoir. In an alternative embodiment, the overflow can be formed as a partition wall including at least one cavity through which the main oil tank and the auxiliary oil tank are fluidly connected.

[0033] The overflow section preferably functions as a baffle that divides the main oil tank's holding volume from the auxiliary oil tank's holding volume. During lateral acceleration, such as when turning and / or accelerating or braking from high speed, the overflow section prevents all fluid in the reservoir from being forced to flow to one side of the reservoir. Specifically, when the lateral force ceases, the overflow section ensures sufficient fluid is available in the main oil tank and / or auxiliary oil tank, such that the first and / or second suction positions are below the liquid level in the main and / or auxiliary oil tanks.

[0034] The main oil tank may have a larger or smaller fluid capacity than the auxiliary oil tank. In an alternative embodiment, the main oil tank and the auxiliary oil tank may have the same fluid capacity. The main oil tank and the auxiliary oil tank preferably have the same depth. In an alternative embodiment, the main oil tank may be implemented as deeper than the auxiliary oil tank. The auxiliary oil tank may also be implemented as deeper than the main oil tank. The main oil tank and the auxiliary oil tank may have the same lateral length. In an alternative embodiment, the main oil tank may have a greater lateral length than the auxiliary oil tank. The auxiliary oil tank may also have a greater lateral length than the main oil tank.

[0035] Preferably, the first suction position leads to the main oil tank, and the second suction position leads to the auxiliary oil tank. In an alternative embodiment, the first suction position can lead to the auxiliary oil tank, and the second suction position can lead to the main oil tank.

[0036] The fluid delivery system may further include a third fluid passage equipped with a third valve. This third fluid passage connects the second pump port to the mechanical component. The fluid delivery system may also include a fourth fluid passage equipped with a fourth valve. This fourth fluid passage preferably connects the first pump port to the mechanical component.

[0037] The third fluid channel may connect to the second fluid channel at its end furthest from the mechanical component. The fourth fluid channel may connect to the first fluid channel at its end furthest from the mechanical component.

[0038] In an alternative embodiment, the third fluid channel may be directly connected to the second pump port at its end furthest from the mechanical component. The second fluid channel may also open into the third fluid channel at its end furthest from the reservoir. In an alternative embodiment, the fourth fluid channel may also be connected to the first pump port at its end furthest from the mechanical component. The first fluid channel may also open into the fourth fluid channel at its end furthest from the reservoir. Therefore, the first pump port may be directly connected to both the first and fourth fluid channels. The second pump port may also be directly connected to both the second and third fluid channels.

[0039] Preferably, the first pump port is connected to the fourth fluid channel via a first fluid channel, and / or, the second pump port is connected to the third fluid channel via a second fluid channel. The third fluid channel may lead into the fourth fluid channel via its end toward the mechanical component. The third fluid channel may particularly lead into the fourth fluid channel between the fourth valve and the mechanical component. In an alternative embodiment, the third fluid channel may be connected to the mechanical component without entering the fourth fluid channel. The fourth fluid channel may also lead into the third fluid channel via its end toward the mechanical component. The fourth fluid channel may particularly lead into the third fluid channel between the third valve and the mechanical component. In a preferred embodiment, the fourth fluid channel may be connected to the mechanical component without leading into the third fluid channel.

[0040] The third valve is preferably disposed between the second pump port and the mechanical assembly. The third valve may particularly be disposed between the mechanical assembly and the junction where the third fluid passage leads to the second fluid passage. The fourth valve is preferably disposed between the first pump port and the mechanical assembly. The fourth valve may particularly be disposed between the mechanical assembly and the junction where the fourth fluid passage leads to the first fluid passage.

[0041] The second valve is preferably located between the second suction position and the junction where the third fluid channel leads to the second fluid channel. The first valve is preferably located between the first suction position and the junction where the fourth fluid channel leads to the first fluid channel.

[0042] When the rotary pump is in its alternative mode, the third valve prevents fluid flow from the first pump port to the second pump port outside the pump's delivery chamber. Specifically, the third valve closes the third fluid passage when the rotary pump is in its alternative mode. When the rotary pump is in its normal mode, the fourth valve prevents fluid flow from the second pump port to the first pump port outside the pump's delivery chamber. Specifically, the fourth valve closes the fourth fluid passage when the rotary pump is in its normal mode.

[0043] The first valve can be in an open position and a shut-off position. In the open position, the first valve allows fluid to flow through it. Specifically, in the open position, the first valve allows fluid to flow from a first suction position through a first fluid passage to a first pump port. In the shut-off position, the first valve prevents fluid from flowing through it. Specifically, in the shut-off position, the first valve prevents fluid from flowing from a first suction position through a first fluid passage to a first pump port. When the rotary pump is in its normal operating mode, the first valve is preferably in the open position. When the rotary pump is in its alternative operating mode, the first valve is preferably in the shut-off position.

[0044] The second valve can be in an open position and a shut-off position. In the open position, the second valve allows fluid to flow through it. Specifically, in the open position, the second valve allows fluid to flow from the second suction position through the second fluid passage to the second pump port. In the shut-off position, the second valve prevents fluid from flowing through it. Specifically, in the shut-off position, the second valve prevents fluid from flowing from the second suction position through the second fluid passage to the second pump port. When the rotary pump is in its normal operating mode, the second valve is preferably in the shut-off position. When the rotary pump is in its alternative operating mode, the second valve is preferably in the open position.

[0045] The third valve can be in an open position and a closed position. In the open position, the third valve allows fluid to flow through it. Specifically, in the open position, the third valve allows fluid to flow through a third fluid channel from its inlet at the end furthest from the mechanical component to the junction of the second fluid channel and the third fluid channel (especially to the junction of the third fluid channel at its end facing the mechanical component and the fourth fluid channel). In the closed position, the third valve prevents fluid from flowing through it. Specifically, in the closed position, the third valve prevents fluid from flowing through the third fluid channel from its inlet at the end furthest from the mechanical component to the junction of the second fluid channel and the third fluid channel (especially to the junction of the third fluid channel at its end facing the mechanical component and the fourth fluid channel). When the rotary pump is in its normal operating mode, the third valve is preferably in the open position. When the rotary pump is in its alternative operating mode, the third valve is preferably in the closed position.

[0046] The fourth valve may have an open position and a shut-off position. In the open position, the fourth valve allows fluid to flow through it. Specifically, in the open position, the fourth valve allows fluid to flow through a fourth fluid channel from its junction with the first fluid channel at its end furthest from the mechanical component to the mechanical component (particularly to the junction with the third fluid channel at its end facing the mechanical component). In the shut-off position, the fourth valve prevents fluid from flowing through it. Specifically, in the shut-off position, the fourth valve prevents fluid from flowing through the fourth fluid channel from its junction with the first fluid channel at its end furthest from the mechanical component to the mechanical component (particularly preventing fluid from flowing to the junction with the third fluid channel at its end facing the mechanical component). When the rotary pump is in its normal operating mode, the fourth valve is preferably in the shut-off position. When the rotary pump is in its alternative operating mode, the fourth valve is preferably in the open position.

[0047] When the rotary pump is in its normal mode, the second and fourth valves are preferably in the off position. When the rotary pump is in its alternative mode, the second and fourth valves are preferably in the open position. Preferably, when the rotary pump is in its normal mode, the rotary pump is therefore unable to draw fluid from the reservoir via the second fluid passage and discharge it to the mechanical components via the fourth fluid passage. Preferably, when the rotary pump is in its alternative mode, the rotary pump is therefore able to draw fluid from the reservoir via the second fluid passage and discharge fluid to the mechanical components via the fourth fluid passage.

[0048] When the rotary pump is in its alternative mode, the first and third valves are preferably in the shut-off position. When the rotary pump is in its normal mode, the first and third valves are preferably in the open position. Preferably, when the rotary pump is in its normal mode, the rotary pump is therefore able to draw fluid from the reservoir via the first fluid passage and discharge fluid to the mechanical components via the third fluid passage. Preferably, when the rotary pump is in its alternative mode, the rotary pump is therefore unable to draw fluid from the reservoir via the first fluid passage and discharge it to the mechanical components via the third fluid passage.

[0049] The first valve is preferably formed as a check valve. More specifically, the first valve is preferably formed as a reflux valve, wherein, when the rotary pump is in its alternative mode, the plug of the first valve is pressed into the valve seat. Specifically, when the rotary pump is in its alternative mode, the fluid pressure in the first fluid passage ensures that the first valve is in the shut-off position. When the rotary pump is in its alternative mode, the plug of the first valve can be specifically pressed into the valve seat by the fluid pressure in the first fluid passage.

[0050] The second valve is preferably formed as a one-way valve. In particular, the second valve is preferably formed as a check valve, wherein, when the rotary pump is in its normal operating mode, the plug of the second valve is pressed into the valve seat. Specifically, when the rotary pump is in its normal operating mode, the fluid pressure in the second fluid passage ensures that the second valve is in the shut-off position. When the rotary pump is in its normal operating mode, the plug of the second valve can be specifically pressed into the valve seat by the fluid pressure in the second fluid passage.

[0051] The third valve is preferably formed as a one-way valve. In particular, the third valve is preferably formed as a check valve, wherein when the rotary pump is in its alternative mode, the plug of the third valve is pressed into the valve seat. Specifically, when the rotary pump is in its normal mode, the fluid pressure in the third fluid passage ensures that the third valve is in the open position. When the rotary pump is in its alternative mode, the plug of the third valve can be specifically pressed into the valve seat by the fluid pressure in the third fluid passage.

[0052] The fourth valve is preferably formed as a one-way valve. More specifically, the fourth valve is preferably formed as a check valve, wherein, when the rotary pump is in its normal operating mode, the blocking element of the fourth valve is pressed into the valve seat. Specifically, when the rotary pump is in its normal operating mode, the fluid pressure in the fourth fluid passage ensures that the fourth valve is in the shut-off position. When the rotary pump is in its normal operating mode, the blocking element of the fourth valve can be specifically pressed into the valve seat by the fluid pressure in the fourth fluid passage.

[0053] The fluid delivery system may additionally include at least one filtration device. Preferably, the filtration device filters the fluid before it flows from the pump to the mechanical components. Alternatively or additionally, the fluid delivery system may include a filtration device that filters the fluid before it flows from the reservoir to the pump.

[0054] The drive for driving the rotary pump is preferably an electric motor. The fluid delivery system preferably includes a motor controller for actuating the electric motor. The motor controller preferably includes monitoring electronics. The monitoring electronics of the motor controller are preferably designed to detect whether the rotary pump is drawing air. The monitoring electronics are particularly designed to detect whether the rotary pump is drawing air through the first and / or second fluid channels.

[0055] Specifically, the motor can be controlled based on multiple characteristic curves or graphs that include the motor's power consumption as a function of the rotational speed of the rotary pump and / or the motor when the pump is operating normally without pumping air. The effect of the fluid and / or the temperature of the rotary pump on the motor's power consumption (particularly as a function of the pump's rotational speed and / or the motor's rotational speed) can also be included in the characteristic curves or graphs. In particular, a threshold can be specified at which the power consumption as a function of the rotational speed of the rotary pump and / or the motor and / or the temperature of the fluid and / or the rotary pump should not be lower than the threshold.

[0056] Preferably, the monitoring electronics of the fluid delivery system are configured to monitor the power consumption of the motor, which is a function of the actual rotational speed of the rotary pump and / or the motor and / or the actual temperature of the fluid and / or the rotary pump. When the power consumption, as a function of the actual rotational speed of the rotary pump and / or the motor and / or the actual temperature of the fluid and / or the rotary pump, drops below a threshold, the motor controller may also change the rotation direction of the motor.

[0057] When the power consumption, based on the actual rotational speed of the rotary pump and / or the motor and / or the actual temperature of the fluid and / or the rotary pump, drops below a threshold, the motor controller may specifically change the rotation direction of the motor for at least one second, and particularly for at least five seconds. In an alternative embodiment, when the power consumption, based on the actual rotational speed of the rotary pump and / or the motor and / or the actual temperature of the fluid and / or the rotary pump, is below the threshold, the motor controller may change the rotation direction of the motor until the power consumption exceeds the threshold again.

[0058] Preferably, changing the rotation direction of the electric motor also changes the rotation direction of the rotary pump. Changing the rotation direction of the electric motor can switch the rotary pump from its normal mode to its alternative mode and / or from its alternative mode to its normal mode. Therefore, the motor controller can also switch the rotary pump from its normal mode to its alternative mode and / or from its alternative mode to its normal mode. Preferably, the rotational speed of the rotary pump is proportional to the rotational speed of the electric motor. The rotational speed of the rotary pump is preferably equal to the rotational speed of the electric motor.

[0059] The motor controller can obtain the actual rotational speed of the rotary pump and / or motor from a tachometer. The motor controller can also obtain the actual temperature of the fluid and / or rotary pump from a temperature measurement probe. The monitoring electronics may include at least one tachometer for determining the actual rotational speed of the rotary pump and / or motor. The monitoring electronics may also include at least one temperature measurement probe for determining the actual temperature of the fluid and / or rotary pump.

[0060] The function of the fluid transport system will be described below.

[0061] When the rotary pump is in its normal operating mode, it preferably draws fluid from a reservoir (particularly from the main oil tank of the reservoir) via a first suction position and a first fluid passage. When the rotary pump is in its normal operating mode, the first valve of the first fluid passage is preferably in the open position. As long as the rotary pump is in its normal operating mode, the drawn fluid is preferably delivered to the mechanical components via a third fluid passage and a third valve.

[0062] If a fluid shortage occurs in the region of the first suction position in the reservoir (especially in the main oil tank of the reservoir), such that the first suction position is no longer completely below the fluid level, air will also be drawn in addition to the fluid. This fluid shortage can occur, for example, when a motor vehicle is turning or when braking or accelerating (if the fluid is forced out of the suction position by the resulting centrifugal force). This specifically means that the rotary pump driver does not need to exert as much power to maintain the rotary pump's rotational speed. This is particularly true when the driver is an electric motor, meaning a decrease in the motor's power consumption.

[0063] The motor controller (especially the monitoring electronics) of the electric motor can determine a decrease in power consumption and compare it with a threshold to be determined or a defined threshold for power consumption, based on the actual speed of the rotary pump and / or the motor and / or the actual temperature of the fluid and / or the rotary pump. If the power consumption falls below the threshold, the motor control device can change the direction of rotation of the motor, thereby changing the direction of rotation of the rotary pump.

[0064] Therefore, the rotary pump can be in its alternative mode and can draw fluid from the reservoir (particularly from the auxiliary oil tank) via the second pump port, the second fluid passage, and the second suction position. The fluid can then be discharged to the mechanical components via the first pump port and, in particular, via the fourth fluid passage.

[0065] The invention also includes a method for operating a fluid delivery system for supplying fluid to a mechanical component. The fluid delivery system is preferably the fluid delivery system described above. The fluid delivery system for the method of operating the fluid delivery system to supply fluid to the mechanical component preferably includes an electric motor that rotates in a first rotational direction in a normal mode and in a second rotational direction in an alternative mode. Preferably, the electric motor drives a rotary pump that, when the motor is in its normal mode, draws fluid from a reservoir via a first pump port and discharges fluid via a second pump port. When the motor is in its alternative mode, the rotary pump also preferably draws fluid from a reservoir via the second pump port and preferably discharges fluid via the first pump port. The motor controller preferably includes monitoring electronics.

[0066] A method for operating a fluid delivery system that supplies fluid to mechanical components preferably includes the following steps.

[0067] First, the power consumption of the motor is preferably detected. This can be achieved by monitoring electronics, which preferably include an ammeter for this purpose. In a subsequent step, the actual rotational speed of the rotary pump and / or the actual temperature of the fluid and / or the rotary pump are preferably detected. To detect the actual rotational speed of the rotary pump and / or the actual temperature of the fluid and / or the rotary pump, the fluid delivery system preferably includes sensors, such as temperature measuring probes and / or tachometers. In alternative embodiments, the actual rotational speed of the motor and the actual rotational speed of the rotary pump may also be detected.

[0068] In subsequent steps, it is preferable to compare the power consumption of the motor with a power consumption threshold, wherein the threshold may be predetermined or determined based on the actual rotational speed of the detected rotary pump or motor and / or the actual temperature of the fluid and / or the rotary pump.

[0069] If the power consumption of the motor drops below a threshold, the motor controller preferably switches the motor from its normal mode to its alternative mode, or from its alternative mode to its normal mode. In an alternative embodiment, when the power consumption of the motor drops below the threshold, the motor controller may switch the motor from its normal mode to its alternative mode for at least one second, and particularly for at least five seconds. Attached Figure Description

[0070] The invention will now be described based on exemplary embodiments. The features disclosed in the exemplary embodiments advantageously develop the subject matter of the claims and the above embodiments.

[0071] Figure 1 This is a hydraulic circuit diagram according to the first exemplary embodiment;

[0072] Figure 2 It is a hydraulic circuit diagram according to the second example embodiment; and

[0073] Figure 3 This is a hydraulic circuit diagram based on the third example embodiment. Detailed Implementation

[0074] Figure 1A fluid delivery system according to a first exemplary embodiment is shown. The fluid delivery system includes a rotary pump 5 having a first pump port 51 and a second pump port 52. The rotary pump 5 can operate in a normal mode and an alternative mode, wherein in the normal mode it rotates along a first rotation direction; and in the alternative mode it rotates along a second rotation direction. The fluid delivery system also includes a reservoir 6 from which the rotary pump 5 draws fluid and delivers it to a mechanical component A. The mechanical component A is preferably the engine and / or transmission system of a motor vehicle. After the fluid has, for example, lubricated and / or cooled the mechanical component A, it can flow back from the mechanical component A to the reservoir 6. Therefore, this fluid delivery system represents a fluid loop. (Different from...) Figure 1 As shown, the reservoir 6 is preferably located below the mechanical component A, particularly at the lowest point of the mechanical component A, so that the fluid can flow back into the reservoir 6 due to gravity. The reservoir 6 can, in particular, be part of the mechanical component A, for example, it can be formed as the lower part of the component housing.

[0075] The reservoir 6 is preferably implemented as a flat reservoir. The reservoir 6 can be implemented, in particular, as a flat tray. The reservoir 6 is preferably connected (especially by a threaded connection) to the housing of the mechanical component A. The reservoir 6 can be made of metal or plastic, particularly by original molding or re-forming methods. The reservoir 6 is preferably made of sheet material, particularly by deep drawing.

[0076] The first pump port 51 is fluidly connected to the reservoir 6 via a first fluid passage 1. The first fluid passage 1 extends from the first pump port 51 through a first valve 11 to a first suction position 10 formed in the reservoir 6. The first valve 11 is exemplarily implemented as a check valve, which may present an open position and a shut-off position. When the rotary pump 5 is in its normal mode of rotation in a first direction of rotation, the first valve 11 is in the open position and opens the first fluid passage 1, allowing the rotary pump 5 to draw fluid from the reservoir 6 via the first pump port 51. When the rotary pump 5 is in its alternative mode, the first valve 11 is in the shut-off position, preventing fluid from flowing to the reservoir 6 via the first pump port 51 and the first fluid passage 1. In particular, the fluid pressure in the first fluid passage 1 ensures that the plug of the first valve 11 is pressed into the valve seat and closes the first valve 11 when the rotary pump 5 is in its alternative mode.

[0077] The second pump port 52 is fluidly connected to the reservoir 6 via the second fluid passage 2. The second fluid passage 2 extends from the second pump port 52 through the second valve 12 to the second suction position 20 formed in the reservoir 6. The second valve 12 is exemplarily implemented as a check valve, which can present an open position and a shut-off position. When the rotary pump 5 is in an alternative mode in which it rotates in a second direction of rotation, the second valve 12 is in its open position and opens the second fluid passage 2, allowing the rotary pump 5 to draw fluid from the reservoir 6 via the second pump port 52. When the rotary pump 5 is in its normal mode, the second valve 12 is in the shut-off position, preventing fluid from flowing to the reservoir 6 via the second pump port 52 and the second fluid passage 2. In particular, the fluid pressure in the second fluid passage 2 ensures that the plug of the second valve 12 is pressed into the valve seat and closes the second valve 12 when the rotary pump 5 is in its normal mode.

[0078] The first pump port 51 is connected to the mechanical component A via a fourth fluid passage 4 having a fourth valve 41. The fourth fluid passage 4 opens into the first fluid passage 1 at its end away from the mechanical component A. The fourth valve 41 is arranged between the mechanical component A and the junction, where the fourth fluid passage 4 opens into the first fluid passage 1 at its end away from the mechanical component A.

[0079] The fourth valve 41 is exemplarily implemented as a check valve having an open position and a shut-off position. In the open position, the fourth valve 41 opens the fourth fluid passage 4; in the shut-off position, the fourth valve 41 closes the fourth fluid passage 4. When the fourth valve 41 is in its open position, fluid can flow from the first pump port 51 through the fourth fluid passage 4 (and particularly through the first fluid passage 1) to the mechanical component A. When the rotary pump 5 is in its alternative mode, the fourth valve 41 is in the open position; while when the rotary pump 5 is in its normal mode, the fourth valve is in the shut-off position. Specifically, when the rotary pump 5 is in its alternative mode, the fluid pressure in the first fluid passage 1 and the fourth fluid passage 4 ensures that the blockage of the fourth valve 41 is forced out of the valve seat, thus placing the fourth valve 41 in its open position. When the rotary pump 5 is in its normal mode, the fourth valve 41 specifically prevents fluid flow outside the delivery chamber of the rotary pump 5 from flowing from the second pump port 52 to the first pump port 51, so that fluid can only flow from the second pump port 52 through the delivery chamber to the first pump port 51.

[0080] The second pump port 52 is connected to the mechanical component A via a third fluid passage 3 having a third valve 31. The third fluid passage 3 opens into the second fluid passage 2 at its end furthest from the mechanical component A. The third fluid passage 3 also opens into a fourth fluid passage 4 at its end facing the mechanical component A. The third valve 31 is located between the junction of the third fluid passage 3 at its end furthest from the mechanical component A and the junction of the third fluid passage 3 at its end facing the mechanical component A and the junction of the third fluid passage 3 at its end facing the mechanical component A and the junction of the third fluid passage 3 into the fourth fluid passage 4.

[0081] The third valve 31 is exemplarily implemented as a check valve, which can be in an open position and a shut-off position. When the third valve 31 is in its open position, fluid can flow from the second pump port 52 through the third fluid passage 3 (particularly through the second fluid passage 2 and the third fluid passage 3) to the mechanical component A. When the rotary pump 5 is in its normal mode, the third valve 31 is in the open position; while when the rotary pump 5 is in its alternative mode, it is in the shut-off position. In particular, when the rotary pump 5 is in its normal mode, the fluid pressure in the third fluid passage 3 ensures that the blockage of the third valve 31 is forced out of the valve seat, so that the third valve 31 is in its open position. When the rotary pump 5 is in its alternative mode, the third valve 31 specifically prevents fluid flow outside the delivery chamber of the rotary pump 5 from flowing from the first pump port 51 to the second pump port 52, so that fluid can only flow from the first pump port 51 through the delivery chamber to the second pump port 52.

[0082] The rotary pump 5 is driven by an electric motor 7. The fluid delivery system includes a motor controller for actuating the electric motor 7. The motor controller preferably includes monitoring electronics designed to detect whether the rotary pump 5 is drawing air via one of the suction positions 10, 20. The monitoring electronics of the fluid delivery system are configured to monitor the power consumption of the electric motor 7 as a function of the actual rotational speed of the rotary pump 5 and / or the electric motor 7, and as a function of the temperature of the rotary pump 5 or the fluid. If the power consumption drops below a predetermined or defined threshold, the rotational direction of the electric motor 7 is changed, and thus the rotational direction of the rotary pump 5 is changed; that is, when the power consumption drops below the threshold, the motor controller switches the electric motor 7, and thus the rotary pump 5, from its normal mode to its alternative mode.

[0083] The motor controller can change the rotation direction of the motor 7 for at least one second (especially at least five seconds), or it can keep the rotation direction of the motor 7 unchanged until the power consumption threshold, which is a function of the actual rotational speed of the rotary pump 5 and / or the fluid and / or the actual temperature of the rotary pump 5, drops below the threshold again.

[0084] Figure 2 A fluid delivery system according to a second example embodiment is shown. Figure 2 Fluid transport system and according to Figure 1 The only difference in the fluid delivery system lies in the implementation of the reservoir 6. Therefore, the differences between the two exemplary embodiments will be discussed below. Figure 1 The features and description of the first exemplary embodiment are also applicable to the second exemplary embodiment, provided that they are not inconsistent with those of the embodiment described above. Figure 2 The exemplary embodiments are contradictory.

[0085] Figure 2 The storage device 6 in the middle and Figure 1 The difference in the reservoir 6 is that it is divided into a main oil tank 61 and an auxiliary oil tank 62. The main oil tank 61 and the auxiliary oil tank 62 are fluidly connected to each other via an overflow portion 63. When the fluid delivery system is operating, the fluid preferably flows from the mechanical component A back to the main oil tank 61, where the rotary pump 5, in its normal mode, draws fluid through a first suction position 10 and discharges it to the mechanical component A. The overflow portion 63 is exemplarily implemented as a partition wall in the reservoir 6, wherein the extension length of the partition wall in the depth direction of the reservoir 6 is less than that of the reservoir 6.

[0086] When the rotary pump 5 is in its alternative mode, it draws fluid from the auxiliary oil tank 62 via the suction position 20. If the fluid delivery system is configured as a fluid delivery system for the engine and / or transmission system of a motor vehicle, the fluid can flow from the main oil tank 61 to the auxiliary oil tank 62 and / or from the auxiliary oil tank 62 to the main oil tank 61 via the overflow section 63 when centrifugal force is applied to the fluid.

[0087] If the fluid is forced to the left side of reservoir 6 (e.g.) Figure 2 As shown by the dashed line in the auxiliary oil tank 62, it can be seen that the suction position 10 is above the fluid surface in the main oil tank 61. When the rotary pump 5 is in its normal mode, this reduces the power consumption of the motor 7, and if the power consumption drops below a threshold, the motor controller switches the motor 7 from its normal mode to its alternative mode.

[0088] Then, when the centrifugal force applied to the fluid stops, especially when the motor controller automatically switches back to normal mode from alternative mode, the overflow section 63 ensures that enough fluid is retained in the main oil tank 61 so that the first suction position 10 is lower than the fluid level in the main oil tank 61.

[0089] according to Figure 2 In an exemplary embodiment, the main oil tank 61 has a smaller holding volume than the auxiliary oil tank 62. In an alternative embodiment, the main oil tank 61 and the auxiliary oil tank 62 may have the same holding volume, or the auxiliary oil tank 62 may have a smaller holding volume than the main oil tank 61.

[0090] according to Figure 3 Exemplary embodiments and Figure 1 and Figure 2 The difference between the exemplary embodiments in the first and second exemplary embodiments lies in the implementation of the fluid channel. Therefore, the essential differences between the third exemplary embodiment and the first two exemplary embodiments will be discussed below. The features and descriptions of the first and second exemplary embodiments also apply to the third exemplary embodiment, provided that they do not differ from those in accordance with... Figure 3 The exemplary embodiments are contradictory.

[0091] Unlike the two exemplary embodiments described above, the fourth fluid channel 4 does not connect to the first fluid channel 1 at its end furthest from the mechanical component A. The fourth fluid channel 4 extends from the first pump port 51 to the mechanical component A. The first fluid channel 1 extends from the first pump port 51 via the first valve 11 to the first suction position 10. Thus, the first pump port 51 is connected (particularly directly connected) to both the first fluid channel 1 and the fourth fluid channel 4.

[0092] The third fluid channel 3 does not connect to the second fluid channel 2 at its end furthest from mechanical component A. The third fluid channel 3 also does not connect to the fourth fluid channel 4 at its end facing mechanical component A. Thus, the third fluid channel 3 extends from the second pump port 52 to mechanical component A. The second fluid channel 2 extends from the second pump port 52 via the second valve 21 to the second suction position 20. Therefore, the second pump port 52 is connected (especially directly connected to) the third fluid channel 3 and the second fluid channel 2.

Claims

1. A fluid delivery system for supplying fluid to a mechanical component (A), the fluid delivery system comprising: a) A reservoir for storing fluids (6); b) A rotary pump (5) having a first pump port (51) and a second pump port (52); c) A driver for driving the rotary pump (5); d) A first fluid passage (1) having a first valve (11) and a second fluid passage (2) having a second valve (21). e) wherein the first fluid channel (1) connects the first pump port (51) to the reservoir (6), and the second fluid channel (2) connects the second pump port (52) to the reservoir (6), and f) The rotary pump (5) is capable of operating in a normal mode and an alternative mode. In the normal mode, the rotary pump (5) rotates along a first conveying direction; in the alternative mode, the rotary pump (5) rotates along a second conveying direction, wherein... g) When the rotary pump (5) is in its alternative mode, the first valve (11) disconnects the first pump port (51) from the reservoir (6); and when the rotary pump (5) is in its normal mode, the second valve (21) disconnects the second pump port (52) from the reservoir (6), and h) Wherein, the driver includes an electric motor and a motor controller for actuating the electric motor, wherein the motor controller includes monitoring electronics for detecting that air is being drawn in. Its features are, i) The monitoring electronics are configured to monitor the power consumption of the motor (7), which is a function of the actual rotational speed of the rotary pump (5) and / or the motor (7) and / or the actual temperature of the fluid and / or the rotary pump (5).

2. The fluid transport system according to claim 1, wherein, When the rotary pump (5) is in its normal mode, the rotary pump (5) draws the fluid through the first pump port (51) and discharges the fluid through the second pump port (52), and when the rotary pump (5) is in its alternative mode, the rotary pump (5) draws the fluid through the second pump port (52) and discharges the fluid through the first pump port (51).

3. The fluid transport system according to claim 1, characterized in that, The first fluid channel (1) enters the reservoir (6) at the first suction position (10), and the second fluid channel (2) enters the reservoir (6) at the second suction position (20), wherein the first suction position (10) and the second suction position (20) are spaced apart from each other.

4. The fluid transport system according to claim 3, characterized in that, The reservoir (6) includes a main oil tank (61), an auxiliary oil tank (62) and an overflow section (63), wherein the fluid flows from the mechanical component (A) back to the main oil tank (61) and the main oil tank (61) is fluidly connected to the auxiliary oil tank (62) via the overflow section (63).

5. The fluid transport system according to claim 4, wherein, The first suction position (10) is connected to the main oil tank (61), and the second suction position (20) is connected to the auxiliary oil tank (62).

6. The fluid transport system according to any one of claims 1-5, characterized in that, It also includes a third fluid channel (3) and a fourth fluid channel (4), wherein the third fluid channel is provided with a third valve (31) and the second pump port (52) is connected to the mechanical assembly (A), and the fourth fluid channel is provided with a fourth valve (41) and the first pump port (51) is connected to the mechanical assembly (A).

7. The fluid transport system according to claim 6, wherein, The third fluid channel (3) enters the second fluid channel (2) at its end away from the mechanical component (A), and the fourth fluid channel (4) enters the first fluid channel (1) at its end away from the mechanical component (A).

8. The fluid transport system according to claim 6, wherein, When the rotary pump (5) is in its alternative mode, the third valve (31) prevents fluid flow outside the delivery chamber of the rotary pump (5) from flowing from the first pump port (51) to the second pump port (52), and when the rotary pump (5) is in its normal mode, the fourth valve (41) prevents fluid flow outside the delivery chamber of the rotary pump (5) from flowing from the second pump port (52) to the first pump port (51).

9. The fluid transport system according to claim 6, wherein, Both the third valve (31) and the fourth valve (41) are formed by one-way valves.

10. The fluid transport system according to any one of claims 1-5, wherein, Both the first valve (11) and the second valve (21) are formed by one-way valves.

11. The fluid transport system according to any one of claims 1-5, wherein, When the power consumption, which is a function of the actual rotational speed of the rotary pump (5) and / or the motor (7) and / or the actual temperature of the fluid and / or the rotary pump (5), drops below a threshold, the motor controller changes the rotation direction of the motor (7).

12. The fluid transport system according to any one of claims 1-5, wherein, When the power consumption, which is a function of the actual rotational speed of the rotary pump (5) and / or the motor (7) and / or the actual temperature of the fluid and / or the rotary pump (5), drops below a threshold, the motor controller changes the rotational direction of the motor (7) for at least one second.

13. The fluid transport system according to claim 12, wherein, When the power consumption, which is a function of the actual rotational speed of the rotary pump (5) and / or the motor (7) and / or the actual temperature of the fluid and / or the rotary pump (5), drops below a threshold, the motor controller changes the rotational direction of the motor (7) for at least five seconds.

14. The fluid transport system according to any one of claims 1-5, wherein, The mechanical component is the engine or transmission system of a motor vehicle.

15. A method for operating a fluid delivery system for supplying fluid to a mechanical component (A), comprising an electric motor (7), a rotary pump (5), and a motor controller, the electric motor rotating in a first rotation direction in a normal mode and in a second rotation direction in an alternative mode, the rotary pump (5) being driven by the electric motor (7), and when the electric motor (7) is in its normal mode, drawing fluid from a reservoir (6) via a first pump port (51) and discharging fluid via a second pump port (52); and when the electric motor (7) is in its alternative mode, drawing fluid from the reservoir (6) via the second pump port (52) and discharging fluid via the first pump port (51), the motor controller comprising monitoring electronics, the method comprising the steps of: a) Detect the power consumption of the motor (7); b) Detect the actual rotational speed of the rotary pump (5) and / or the actual temperature of the fluid and / or the rotary pump (5); c) Compare the power consumption with a threshold for the power consumption, wherein the threshold is predetermined or determined based on the detected actual rotational speed and / or the actual temperature of the fluid and / or the rotary pump (5); d) If the power consumption drops below the threshold, the motor controller switches the motor (7) from its normal mode to its alternative mode, or from its alternative mode to its normal mode.

16. The method for operating a fluid delivery system according to claim 15, wherein, The fluid transport system is the fluid transport system according to any one of claims 1 to 14.

17. The method for operating a fluid delivery system according to claim 16, wherein, The monitoring electronics are configured to detect that air is being drawn through the first fluid channel and / or the second fluid channel.

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