EP3848592A1 - Fluid supply system for supplying multiple fluid consumers of a motor vehicle with fluid - Google Patents

Abstract

Fluid supply system for supplying several fluid consumers of a motor vehicle with fluid, the fluid supply system comprising: (a) a first pump (1) for supplying a first fluid consumer (3) arranged in a first supply circuit (5) of the motor vehicle with fluid, (b) a second pump (2) for supplying a second fluid consumer (4) arranged in a second supply circuit (6) of the motor vehicle with fluid, and (c) a directional control valve (7, 8; 15, 8) which, between a first valve position and at least one other, second valve position is adjustable and for adjustment preferably comprises an electromagnet device (7b; 15b), (d) wherein the directional valve (7, 8; 15, 8) - in the first valve position, a delivery of the fluid from the second pump (2) into the first supply circuit (5) allows and- in the second valve position the first supply circuit (5) separates from the second pump (2) or a delivery of the fluid from the second pump (2) into the first supply circuit (5) only allows throttled compared to the first valve position.

Description

The invention relates to a fluid supply system for supplying several fluid consumers of a motor vehicle with fluid.

Vehicles with internal combustion engines can have a lubricating oil circuit for lubricating the engine with lubricating oil and a cooling circuit for cooling the engine, for example for cooling the pistons of the engine. Typically one of these circles branches off from the other. For internal combustion engines with variable valve timing, there is also a supply circuit for adjusting the phase position of the camshaft relative to the crankshaft. In addition or instead, the drive motor can also have the possibility of adjusting the connecting rod length and the vehicle can have a supply circuit for adjusting the connecting rod. In addition, there is or are typically one or more supply circuits for supplying one or more transmissions, for example an automatic transmission and / or a steering gear, in order to be able to fluidically actuate the respective transmission. Electric vehicles or hybrid vehicles also have supply circuits for drive motor cooling, battery cooling and / or actuation of one or more transmissions.

The different supply circuits typically place different demands on the volume flows and / or pressures to be supplied. A correspondingly large pump can be used to meet different requirements. The required pressures and flow rates can be set using valves. However, due to its dimensioning, the common pump delivers a volume flow that is too high and / or a pressure that is too high for one or more of the jointly supplied supply circuits, so that part of the fluid is conveyed away with losses into a reservoir for the fluid.

A main pump and an additional pump can be used in order to reduce the energy losses resulting from the discharge into the reservoir Additional pump is switched on if necessary, so that the main pump can be designed for a smaller delivery volume. An additional pump driven by the drive motor and thus in a fixed speed ratio to this is switched on and off with the help of valves, via which fluid that is still being pumped in excess is discharged to the reservoir or unnecessarily pumped in a smaller circle by bypassing the reservoir. To increase the efficiency of a fluid supply system with the main pump and the additional pump, the main pump and / or the additional pump can be designed to be adjustable in terms of the delivery volume. Alternatively, the additional pump can be driven independently of the drive motor of the vehicle by means of a comparatively small electric motor assigned to the additional pump.

It is an object of the invention to supply two or more fluid consumers of a motor vehicle with fluid in accordance with the requirements of the respective fluid consumer and with a high degree of efficiency.

To supply a first fluid consumer and a second fluid consumer of a motor vehicle with fluid, the invention proposes a fluid supply system with a first pump and at least one further, second pump. The first pump is used to supply the first fluid consumer, which is arranged in a first supply circuit, with a first volume flow and a first supply pressure of the fluid. The second pump is used to supply the second fluid consumer, which is arranged in a second supply circuit, with a second volume flow and a second supply pressure of the fluid. The first fluid consumer can be an individual component, for example a piston of an internal combustion engine to be cooled with the fluid, or an assembly composed of several components, such as a drive motor or a transmission of the motor vehicle. The same applies to the second fluid consumer, which accordingly can be an assembly composed of several components or a single component. In any case, the first and second fluid consumers are different fluid consumers. As far as relevant for the fluid supply system, these fluid consumers can differ from one another, in particular with regard to the required volume flow and / or supply pressure.

The fluid can in particular be a hydraulic fluid. It can be an oil for lubricating and / or cooling a drive motor or one or more components of a drive motor or a transmission and / or working oil for actuating one or more transmissions and / or one or more actuating devices of an engine of the vehicle. A typical fluid consumer of a motor vehicle is its drive motor itself, which has to be lubricated and / or cooled with the fluid at different points, wherein the drive motor can be designed as an internal combustion engine or an electric motor. Internal combustion engines can also have fluid consumers with special requirements, for example one or more pistons to be cooled with the fluid and / or one or more camshaft actuators to be actuated with the fluid, each for adjusting the phase position of a camshaft relative to a crankshaft and / or one or more with the Fluid-actuated connecting rod adjusters each for adjusting the length of a connecting rod or several connecting rods. The first fluid consumer and / or the second fluid consumer can also be components or assemblies of a transmission or different transmissions of the vehicle.

If the first fluid consumer is, for example, a drive motor of the vehicle designed as an internal combustion engine, the first circuit can be the lubricating oil supply circuit of the drive motor. In such cases, the second fluid consumer can be formed by one or more pistons of the drive motor to be cooled. In such cases, the second supply circuit is accordingly a piston cooling circuit. Alternatively, the second circuit can be, for example, a supply circuit for one or more phase adjusters for adjusting the phase position of one or more camshafts of the drive motor. In yet another alternative, the second supply circuit can be a circuit for supplying one or more connecting rod adjusters, each for adjusting the length or lengths of one or more connecting rods of the drive motor. In a further alternative, the first supply circuit can be a first cooling circuit for cooling an internal combustion engine of a hybrid vehicle, and the second supply circuit can be a second cooling circuit for cooling an electric motor and / or a battery of the hybrid vehicle, the internal combustion engine, the electric motor and the battery being dem Serve drive the hybrid vehicle.

In addition to the pumps, the fluid supply system includes a directional control valve which is arranged downstream of the second pump. The directional control valve can be reversed between a first valve position and at least one other, second valve position, i.e. adjustable back and forth. In the first valve position, it allows the fluid to be conveyed from the second pump into the first circuit. In the second valve position, it separates the first supply circuit from the second pump or allows the fluid to be conveyed from the second pump into the first supply circuit only in a throttled manner compared to the first valve position.

In the first embodiments, the directional control valve can be arranged in the second supply circuit. In the first embodiments, it can be set up to allow the fluid to be conveyed from the second pump to the second fluid consumer arranged in the second supply circuit in the second valve position and / or an optionally further, in this case third valve position. The directional control valve can have one or more further valve positions. In simple and not least therefore preferred embodiments, however, it only has two different valve positions, namely the first and second valve positions. The directional valve can in particular be designed as a 3/2-way valve.

In a second embodiment, the directional control valve is not arranged directly in the second supply circuit, but is only connected to the second supply circuit, in such a way that the fluid does not have to flow through the directional control valve in the direction of the second fluid consumer, but the delivery of the fluid to the second fluid consumer by means of the directional control valve does can be influenced as required. In the second embodiments, and also in the first embodiments, the fluid supply system comprises a connecting line which branches off from the second supply circuit at a junction downstream of the second pump and upstream of the second fluid consumer in order to be able to connect the first supply circuit to the second supply circuit. In the second version, the directional control valve is arranged downstream of the junction in the connecting line. In the first valve position, it accordingly allows the fluid to be conveyed from the second pump into the first supply circuit. In the second valve position, it can interrupt the connection line, as is preferred, in order to separate the first supply circuit from the second pump, or at least act as a throttle. As explained in relation to the first versions, the directional control valve can also be used in the second versions or have several further valve positions, but in the second embodiments it is preferably only reversible between two different valve positions, namely the first and the second valve position. In the second embodiments, the directional valve can advantageously be designed very simply as a 2/2-way valve. As a result, the second fluid consumer is permanently supplied with the fluid. By means of the directional control valve, the pressure for the second fluid consumer can be changed, advantageously switched, between the first supply pressure and the second supply pressure.

Since the second pump can be connected to the first circuit by means of the directional control valve, which advantageously happens when the second fluid consumer does not need any fluid or fluid only with a volume flow and / or pressure that is smaller than that which can be supplied by the second pump or are, the second pump can deliver in such operating phases of the second fluid consumer to support the first pump in the first circuit. The fluid conveyed by the second pump does not have to be conveyed in a lossy manner into a reservoir or in a smaller circle, so to speak, circulating empty. The at least temporary support relieves the first pump in two ways. On the one hand, it can be completely relieved of the supply of the second fluid consumer and, on the other hand, it can be partially relieved of the supply of the first fluid consumer. Because of the relief from the second fluid consumer, the first pump can be dimensioned smaller in terms of its delivery volume compared to a pump that must also supply the second fluid consumer. If the delivery volume of the first pump is adjustable, its delivery volume can be reduced accordingly in the support phases and the drive power required to drive the first pump can be reduced as a result.

“Delivery volume” is understood to mean the specific delivery volume, that is to say the delivery volume per revolution or linear stroke of the respective pump. The first pump and the second pump are each preferably designed as rotary pumps. In principle, however, one of the pumps or both pumps can each be designed as linear reciprocating pumps.

The fluid supply system is particularly advantageous in uses in which one of the supply circuits, for example the first supply circuit, with a larger volume flow than the other supply circuit must be supplied and / or one of the supply circuits, for example the second supply circuit, must be supplied with a higher pressure than the other supply circuit. The pump that is assigned to the supply circuit with the higher volume flow requirement can be designed for a higher delivery volume than the other pump. The pump that has to deliver the higher pressure can be designed for greater mechanical robustness and / or for a lower leakage flow, for example for tighter tolerances and tolerance chains, than the other pump. For example, the first pump can have a higher delivery volume than the second pump and / or the second pump can be designed to deliver the fluid at a higher pressure than the first pump.

If one of the pumps or both pumps are rotary pumps, the respective pump can be designed, for example, as an external gear pump, internal gear pump, pendulum slide pump or vane pump. If one of the pumps or the pumps are each adjustable in terms of delivery volume, the respective pump is advantageously designed as a vane pump, since such pumps can be adjusted in terms of delivery volume comparatively easily and precisely. If one or the pumps are designed as fixed displacement pumps, the respective pump is, in preferred embodiments, a gear pump. Gear pumps, in particular external gear pumps, are simple in structure and mechanically relatively robust. If one of the circuits has to be supplied with a higher pressure than the other circuit, in particular the pump assigned at least primarily in the circuit with a higher pressure requirement can be a gear pump.

The directional control valve can advantageously be set up so that it separates the second fluid consumer from the second pump in at least one valve position. This at least one valve position can in particular be the first valve position. In principle, however, the directional valve can also have one or more further valve positions, for example as a 3/3-way valve or 4/3-way valve, and separate the second fluid consumer from the second pump in a third valve position.

In preferred embodiments, the directional control valve is set up to separate the second pump from the first supply circuit in at least one valve position. These at least one valve position can in particular be the second valve position. In principle, however, the directional valve can have one or more further valve positions, for example a third valve position or possibly a fourth valve position, and separate the second pump from the first circuit in this further valve position.

It is preferred that the directional control valve interrupts the connection between the second pump and the second fluid consumer in the first valve position and interrupts the connection between the second pump and the first circuit in the second valve position. On the other hand, versions can also be implemented in which the directional valve does not completely interrupt the volume flow in the direction of the second fluid consumer in the first valve position, but only throttles it compared to the second valve position and / or does not completely interrupt the volume flow to the first circuit in the second valve position , but only throttles compared to the first valve position.

In advantageous designs, the directional control valve is an electromagnetic valve. In such embodiments, it comprises a valve piston that can move back and forth, a valve spring which exerts a spring force on the valve piston, and an electromagnet device for generating an electromagnetic force counteracting the spring force. The electromagnetic device can be connected to a higher-level controller, for example an engine controller of the motor vehicle, and can be controlled by the controller using current signals, for example. Although it is fundamentally conceivable that the directional control valve can also be acted upon by a fluid pressure, expediently a pressure of the second supply circuit, the embodiment as a pure solenoid valve, i.e. acted upon only by the valve spring and the solenoid device, is preferred.

In further developments, the fluid supply system comprises an adjusting valve which is arranged in the second supply circuit between the second pump and the second fluid consumer and is set up to adjust the pressure prevailing in the second circuit, preferably to limit it to a maximum pressure. The setting, preferably limitation, is expediently achieved in that the pressure prevailing in the second supply circuit is applied to the setting valve. In such embodiments, the adjusting valve is a fluidic valve with a valve piston that can be moved back and forth, a valve spring, which exerts a spring force on the valve piston exerts, and a pressure chamber in which the valve piston can be acted upon by a fluid control pressure counter to the spring force. The adjusting valve can in particular be a pure fluidic valve, that is to say a valve whose valve position is adjusted solely from the balance between the spring force and the counteracting fluid adjusting pressure. The fluid control pressure can depend on the pressure of the fluid in the second supply circuit. The fluid setting pressure preferably corresponds to or corresponds to a pressure of the fluid in the second supply circuit, in that fluid is fed from the second supply circuit upstream of the second fluid consumer to the setting valve and is applied to this as the fluid setting pressure.

• Aspekt 1. Fluidversorgungssystem zur Versorgung mehrerer Fluidverbraucher eines Kraftfahrzeugs mit Fluid, das Fluidversorgungssystem umfassend:
  1. (a) eine erste Pumpe (1) zur Versorgung eines in einem ersten Versorgungskreis (5) des Kraftfahrzeugs angeordneten ersten Fluidverbrauchers (3) mit Fluid,
  2. (b) eine zweite Pumpe (2) zur Versorgung eines in einem zweiten Versorgungskreis (6) des Kraftfahrzeugs angeordneten zweiten Fluidverbrauchers (4) mit Fluid, und
  3. (c) ein Wegeventil (7, 8; 15, 8), das zwischen einer ersten Ventilstellung und wenigstens einer anderen, zweiten Ventilstellung verstellbar ist,
  4. (d) wobei das Wegeventil (7, 8; 15, 8)
     • in der ersten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) zulässt und
     • in der zweiten Ventilstellung den ersten Versorgungskreis (5) von der zweiten Pumpe (2) trennt oder eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) im Vergleich zur ersten Ventilstellung nur gedrosselt zulässt.
• Aspekt 2. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das Wegeventil (7, 8) in der zweiten Ventilstellung eine Förderung des Fluids im zweiten Versorgungskreis (6) von der zweiten Pumpe (2) zum zweiten Fluidverbraucher (4) zulässt.
• Aspekt 3. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (15; 7, 8) in der ersten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) und in Richtung auf den zweiten Fluidverbraucher (4) zulässt, so dass der zweite Fluidverbraucher (4) nur mit einem im Vergleich zur zweiten Ventilstellung niedrigeren Druck (P1) versorgt wird, oder die zweite Pumpe (2) vom zweiten Fluidverbraucher (4) trennt.
• Aspekt 4. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (7, 8) stromab der zweiten Pumpe (2) und stromauf des zweiten Fluidverbrauchers (4) im zweiten Versorgungskreis (6) angeordnet ist.
• Aspekt 5. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (7, 8) einen Druckanschluss für die zweite Pumpe (2), einen ersten Arbeitsanschluss für den ersten Versorgungskreis (5) und einen im zweiten Versorgungskreis (6) gelegenen zweiten Arbeitsanschluss aufweist und den Druckanschluss wahlweise entweder mit dem ersten Arbeitsanschluss oder dem zweiten Arbeitsanschluss verbindet.
• Aspekt 6. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (7, 8) ein 3/2-Wegeventil ist.
• Aspekt 7. Fluidversorgungssystem nach einem der Aspekte 1 bis 3, wobei eine Verbindungsleitung (11) vom zweiten Versorgungskreis (6) an einer Abzweigung (11') stromab der zweiten Pumpe (2) und stromauf des zweiten Fluidverbrauchers (4) abzweigt, um den ersten Versorgungskreis (5) mit dem zweiten Versorgungskreis (6) zu verbinden, und wobei das Wegeventil (15) stromab der Abzweigung (11') in der Verbindungsleitung (11) angeordnet ist.
• Aspekt 8. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das Wegeventil (15) einen Druckanschluss für die zweite Pumpe (2) und einen Arbeitsanschluss für den ersten Versorgungskreis (5) aufweist und den Druckanschluss wahlweise entweder mit dem Arbeitsanschluss verbindet oder vom zweiten Arbeitsanschluss trennt.
• Aspekt 9. Fluidversorgungssystem nach einem der zwei unmittelbar vorhergehenden Aspekte, wobei das Wegeventil (15) ein 2/2-Wegeventil ist.
• Aspekt 10. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (7; 15) ein steuerbares Elektromagnetventil ist
• Aspekt 11. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das Wegeventil (7; 15) eine Ventilfeder (7a; 15a) umfasst, die auf das Wegeventil (7; 15) in Richtung auf eine der Ventilstellungen, vorzugsweise in Richtung auf die erste Ventilstellung, wirkt.
• Aspekt 12. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das Wegeventil (7; 15) eine Elektromagneteinrichtung (7b; 15b) zur Erzeugung einer der Ventilfeder (7a; 15a) entgegenwirkenden elektromotorischen Kraft aufweist.
• Aspekt 13. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, umfassend ein Einstellventil (8) zur Einstellung eines im zweiten Versorgungskreis herrschenden zweiten Drucks (P2) auf ein vorgegebenes oder vorgebbares Druckniveau, vorzugsweise zur Begrenzung des zweiten Drucks (P2) auf einen Maximalwert.
• Aspekt 14. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das Einstellventil (8) zur Einstellung des zweiten Drucks (P2) mit einem Fluidstelldruck, beispielsweise dem zweiten Druck (P2), beaufschlagbar ist.
• Aspekt 15. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei der Fluidstelldruck vom zweiten Druck (P2) abhängt.
• Aspekt 16. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei der Fluidstelldruck dem zweiten Druck (P2) entspricht.
• Aspekt 17. Fluidversorgungssystem nach einem der drei unmittelbar vorhergehenden Aspekte, wobei das Einstellventil (8) eine Ventilfeder (8a) umfasst, die dem Fluidstelldruck entgegenwirkt.
• Aspekt 18. Fluidversorgungssystem nach einem der vier unmittelbar vorhergehenden Aspekte, wobei vom zweiten Versorgungskreis (6), vorzugsweise stromab des Einstellventils (8), eine Rückführleitung (8b) abzweigt und in eine Druckkammer des Einstellventils (8) führt, um das Einstellventil (8) mit einem im zweiten Versorgungskreis (6) herrschenden Druck, vorzugsweise unmittelbar dem einzustellenden zweiten Druck (P2), zu beaufschlagen.
• Aspekt 19. Fluidversorgungssystem nach einem der Aspekte 13 bis 17, wobei das Einstellventil (8) zwischen einer ersten Ventilstellung und wenigstens einer anderen, zweiten Ventilstellung verstellbar ist und in seiner ersten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) zulässt und in seiner zweiten Ventilstellung den ersten Versorgungskreis (5) von der zweiten Pumpe (2) trennt oder eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) im Vergleich zur ersten Ventilstellung nur gedrosselt zulässt.
• Aspekt 20. Fluidversorgungssystem nach einem der Aspekte 13 bis 18, wobei das Einstellventil (8) zwischen einer ersten Ventilstellung und wenigstens einer anderen, zweiten Ventilstellung verstellbar ist und in seiner zweiten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) zu dem zweiten Fluidverbraucher (4) und in seiner ersten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) in den ersten Versorgungskreis (5) zulässt, um den zweiten Druck (P2) einzustellen, beispielsweise zu begrenzen.
• Aspekt 21. Fluidversorgungssystem nach Aspekt 19 oder Aspekt 20, wobei das Einstellventil (8) die zweite Pumpe (2) vom zweiten Fluidverbraucher (4) trennt oder eine Förderung des Fluids von der zweiten Pumpe (2) zum zweiten Fluidverbraucher (4) im Vergleich zur zweiten Ventilstellung nur gedrosselt zulässt, wenn das Einstellventil (8) seine erste Ventilstellung einnimmt.
• Aspekt 22. Fluidversorgungssystem nach einem der Aspekte 19 bis 21, wobei das Einstellventil (8) die zweite Pumpe (2) vom zweiten Fluidverbraucher (4) trennt, wenn das Einstellventil (8) seine erste Ventilstellung einnimmt.
• Aspekt 23. Fluidversorgungssystem nach einem der Aspekte 19 bis 22, wobei das Einstellventil (8) eine Ventilfeder (8a) umfasst, die in Richtung auf die zweite Ventilstellung des Einstellventils (8) wirkt.
• Aspekt 24. Fluidversorgungssystem nach einem der Aspekte 19 bis 23, wobei das Einstellventil (8) in seiner ersten Ventilstellung den zweiten Fluidverbraucher (4) vom Wegeventil (7) trennt.
• Aspekt 25. Fluidversorgungssystem nach einem der Aspekte 19 bis 24, wobei das Einstellventil (8) in seiner zweiten Ventilstellung den ersten Versorgungskreis (5) vom Wegeventil (7) trennt.
• Aspekt 26. Fluidversorgungssystem nach einem der Aspekte 19 bis 25, wobei das Einstellventil (8) in seiner zweiten Ventilstellung den zweiten Fluidverbraucher (4) mit dem Wegeventil (7) verbindet.
• Aspekt 27. Fluidversorgungssystem nach einem der Aspekte 19 bis 26, wobei die zweite Pumpe (2) mit dem ersten Versorgungskreis (5) verbunden ist, wenn das Wegeventil (7; 15) seine erste Ventilstellung und/oder das Einstellventil (8) seine erste Ventilstellung einnimmt oder jeweils einnehmen.
• Aspekt 28. Fluidversorgungssystem nach einem der Aspekte 19 bis 27, wobei die zweite Pumpe (2) vom ersten Versorgungskreis (5) nur dann getrennt ist, wenn das Wegeventil (7; 15) und das Einstellventil (8) jeweils ihre zweite Ventilstellung einnehmen.
• Aspekt 29. Fluidversorgungssystem nach einem der Aspekte 13 bis 28, wobei das Wegeventil (7) in seiner ersten Ventilstellung das Einstellventil (8) von der zweiten Pumpe (2) trennt.
• Aspekt 30. Fluidversorgungssystem nach einem der Aspekte 13 bis 29, wobei das Wegeventil (7) in seiner ersten Ventilstellung eine Förderung des Fluids von der zweiten Pumpe (2) unter Umgehung des Einstellventils (8) in den ersten Versorgungskreis (5) zulässt.
• Aspekt 31. Fluidversorgungssystem nach einem der Aspekte 13 bis 30, wobei das Wegeventil (7) in seiner zweiten Ventilstellung das Einstellventil (8) mit der zweiten Pumpe (2) verbindet.
• Aspekt 32. Fluidversorgungssystem nach einem der Aspekte 13 bis 31, wobei das Einstellventil (8) einen Druckanschluss für die zweite Pumpe (2), einen ersten Arbeitsanschluss für den ersten Versorgungskreis (5) und einen im zweiten Versorgungskreis (6) gelegenen zweiten Arbeitsanschluss aufweist und den Druckanschluss entweder mit dem ersten Arbeitsanschluss oder dem zweiten Arbeitsanschluss verbindet.
• Aspekt 33. Fluidversorgungssystem nach dem vorhergehenden Aspekt und Aspekt 5, wobei der zweite Arbeitsanschluss des Wegeventils (7) mit dem Druckanschluss des Einstellventils (8) verbunden ist.
• Aspekt 34. Fluidversorgungssystem nach einem der Aspekte 13 bis 33, wobei das Einstellventil (8) im zweiten Versorgungskreis (6) angeordnet ist
• Aspekt 35. Fluidversorgungssystem nach einem der Aspekte 13 bis 34, wobei das Wegeventil (7) und das Einstellventil (8) im zweiten Versorgungskreis (5) in Serie angeordnet sind.
• Aspekt 36. Fluidversorgungssystem nach einem der Aspekte 13 bis 35, wobei das Wegeventil (7) im zweiten Versorgungskreis (5) stromauf des Einstellventils (8) angeordnet ist.
• Aspekt 37. Fluidversorgungssystem nach einem der Aspekte 13 bis 36, wobei das Einstellventil (8) ein Wegeventil, beispielsweise ein 3/2-Wegeventil, ist.
• Aspekt 38. Fluidversorgungssystem nach einem der Aspekte 13 bis 37, wobei das Einstellventil (8) ein Fluidikventil ist.
• Aspekt 39. Fluidversorgungssystem nach einem der Aspekte 13 bis 38, wobei das Einstellventil (8) zur Einstellung des zweiten Drucks (P2) mit einem Fluidstelldruck beaufschlagbar ist und der Fluidstelldruck auf das Einstellventil (8) in Richtung auf eine der Ventilstellungen, vorzugsweise in Richtung auf die erste Ventilstellung, wirkt.
• Aspekt 40. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, umfassend ein im ersten Versorgungskreis (5) angeordnetes Druckbegrenzungsventil (9) zur Begrenzung eines im ersten Versorgungskreis (5) herrschenden ersten Drucks (P1) auf ein vorgegebenes oder vorgebbares Druckniveau, vorzugsweise zur Begrenzung des ersten Drucks (P1) auf einen Maximalwert.
• Aspekt 41. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) zur Begrenzung des ersten Drucks (P1) mit einem Fluidstelldruck, beispielsweise dem ersten Druck (P1), beaufschlagbar ist.
• Aspekt 42. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei der Fluidstelldruck vom ersten Druck (P1) abhängt.
• Aspekt 43. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei der Fluidstelldruck dem ersten Druck (P1) entspricht.
• Aspekt 44. Fluidversorgungssystem nach einem der Aspekte 40 bis 43, wobei vom ersten Versorgungskreis (5), vorzugsweise stromab des Druckbegrenzungsventils (9), eine Rückführleitung (9b) abzweigt und in eine Druckkammer des Druckbegrenzungsventils (9) führt, um das Druckbegrenzungsventil (9) mit einem im ersten Versorgungskreis (5) herrschenden Druck, vorzugsweise unmittelbar dem einzustellenden ersten Druck (P1), zu beaufschlagen.
• Aspekt 45. Fluidversorgungssystem nach einem der Aspekte 40 bis 44, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) eine Ventilfeder (9a) umfasst, die dem Fluidstelldruck entgegenwirkt.
• Aspekt 46. Fluidversorgungssystem nach einem der Aspekte 40 bis 45, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) einen Druckanschluss für die erste Pumpe (1), einen im ersten Versorgungskreis (5) gelegenen ersten Arbeitsanschluss und einen mit einem Reservoir (R) für das Fluid verbundenen zweiten Arbeitsanschluss aufweist und den Druckanschluss entweder mit dem ersten Arbeitsanschluss oder dem zweiten Arbeitsanschluss verbindet.
• Aspekt 47. Fluidversorgungssystem nach einem der Aspekte 40 bis 46, wobei die zweite Pumpe (2) über das Wegeventil (7, 8; 15) stromab des im ersten Versorgungskreis (5) angeordneten Druckbegrenzungsventils (9) mit dem ersten Versorgungskreis (5) verbindbar ist.
• Aspekt 48. Fluidversorgungssystem nach einem der einem der Aspekte 40 bis 47, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) ein Wegeventil, beispielsweise ein 3/2-Wegeventil, ist.
• Aspekt 49. Fluidversorgungssystem nach einem der einem der Aspekte 40 bis 48, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) ein Fluidikventil ist.
• Aspekt 50. Fluidversorgungssystem nach einem der Aspekte 40 bis 49, wobei das im ersten Versorgungskreis (5) angeordnete Druckbegrenzungsventil (9) zwischen einer ersten Ventilstellung und wenigstens einer anderen, zweiten Ventilstellung verstellbar ist und in seiner ersten Ventilstellung eine Förderung des Fluids von der ersten Pumpe (1) zum ersten Fluidverbraucher (3) und in seiner zweiten Ventilstellung eine Förderung des Fluids in Richtung eines Reservoirs (R), vorzugsweise unmittelbar in die Umgebung des Einstellventils (9), zulässt, um den ersten Druck (P1) einzustellen, beispielsweise zu begrenzen.
• Aspekt 51. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei einer der Versorgungskreise (5, 6), vorzugsweise der erste Versorgungskreis (5), einen größeren Volumenstrom als der andere der Versorgungskreise (5, 6) benötigt und diejenige der Pumpen (1, 2), die in dem Versorgungkreis (5) angeordnet ist, der den größeren Volumenstrom benötigt, vorzugsweise ein größeres spezifisches Fördervolumen als die andere der Pumpen (1, 2) hat.
• Aspekt 52. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das spezifische Fördervolumen einer der Pumpen (1, 2), vorzugsweise der ersten Pumpe (1), größer als das spezifische Fördervolumen der anderen der Pumpen (1, 2) ist.
• Aspekt 53. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) und/oder die zweite Pumpe (2) im Fördervolumen verstellbar ist oder jeweils sind.
• Aspekt 54. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei einer der Versorgungskreise (5, 6), vorzugsweise der zweite Versorgungskreis (6), einen höheren Druck als der andere der Versorgungskreise (5, 6) benötigt und diejenige der Pumpen (1, 2), die in dem Versorgungkreis (5) angeordnet ist, der den höheren Druck benötigt, vorzugsweise gegen einen höheren Gegendruck als die andere der Pumpen (1, 2) fördern kann.
• Aspekt 55. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei eine der Pumpen (1, 2), vorzugsweise die zweite Pumpe (2), gegen einen höheren Gegendruck als die andere der Pumpen (1, 2) fördern kann.
• Aspekt 56. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei wenigstens eine der Pumpen (1, 2), vorzugsweise die zweite Pumpe (2), eine Konstantpumpe ist.
• Aspekt 57. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei eine der Pumpen (1, 2), vorzugsweise die erste Pumpe (1), im Fördervolumen verstellbar und die andere der Pumpen (1, 2), vorzugsweise die zweite Pumpe (2), eine Konstantpumpe ist.
• Aspekt 58. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei wenigstens eine der Pumpen (1, 2), vorzugsweise die erste Pumpe (1), eine Flügelpumpe, vorzugsweise Flügelzellenpumpe, ist.
• Aspekt 59. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei wenigstens eine der Pumpen (1, 2), vorzugsweise die zweite Pumpe (2), eine Zahnradpumpe, vorzugsweise Außenzahnradpumpe, ist.
• Aspekt 60. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei eine der Pumpen (1, 2), vorzugsweise die erste Pumpe (1), eine Flügelpumpe und die andere der Pumpen (1, 2), vorzugsweise die zweite Pumpe (2), eine Zahnradpumpe ist.
• Aspekt 61. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) ein drehbares erstes Förderglied und die zweite Pumpe (2) ein drehbares zweites Förderglied aufweisen und diese Förderglieder auf einer gemeinsamen Antriebswelle (10) angeordnet sind.
• Aspekt 62. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei das erste Förderglied und das zweite Förderglied um die gleiche Drehachse drehbar angeordnet sind.
• Aspekt 63. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) und/oder die zweite Pumpe (2) in fester, vorzugsweise gleicher, Drehzahlbeziehung von einem Motor, vorzugsweise dem im ersten Versorgungskreis (5) angeordneten Aggregat (3), des Kraftfahrzeugs angetrieben wird oder werden.
• Aspekt 64. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) und die zweite Pumpe (2) in einem gemeinsamen Pumpengehäuse angeordnet sind.
• Aspekt 65. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei das Pumpengehäuse außen einen ersten Sauganschluss für die erste Pumpe (1) und einen zweiten Sauganschluss für die zweite Pumpe (2) aufweist.
• Aspekt 66. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) und die zweite Pumpe (2) auf einer Niederdruckseite an ein gemeinsames Reservoir (R) angeschlossen sind.
• Aspekt 67. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei Fluid vom ersten Versorgungskreis (5) und/oder vom zweiten Versorgungskreis (6) in das Reservoir (R) abströmt.
• Aspekt 68. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, umfassend eine Sperreinrichtung (12), die in einer Verbindungsleitung (11) stromab des Wegeventils (7; 15) und stromauf des ersten Versorgungskreises (5) angeordnet ist und eine Förderung über das Wegeventil (7; 15) in Richtung auf den ersten Versorgungskreis (5) erst bei Überschreitung eines mittels der Sperreinrichtung (12) fest vorgegebenen oder einstellbaren Drucks zulässt.
• Aspekt 69. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei der zweite Fluidverbraucher (4) mittels der Sperreinrichtung (12) auf einen bestimmten Druck, beispielsweise den mittels der Sperreinrichtung (12) fest vorgegebenen oder einstellbaren Druck, vorgeladen wird.
• Aspekt 70. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, umfassend eine Sperreinrichtung (12), die in einer Verbindungsleitung (11) stromab der zweiten Pumpe (2), vorzugsweise stromab des Wegeventils (7; 15), und stromauf des ersten Versorgungskreises (5) angeordnet ist und ein Rückströmen von Fluid in Richtung auf den zweiten Versorgungskreis (6) verhindert und beispielsweise ein Rückschlagventil ist.
• Aspekt 71. Fluidversorgungssystem nach einem der vorhergehenden Aspekte in Kombination mit Aspekt 13, umfassend eine Sperreinrichtung (14), die in einer Verbindungsleitung (13) stromab des Einstellventils (8) und stromauf des ersten Versorgungskreises (5) angeordnet ist und ein Rückströmen von Fluid in Richtung auf den zweiten Versorgungskreis (6) verhindert und beispielsweise ein Rückschlagventil ist.
• Aspekt 72. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei der erste Fluidverbraucher (3) ein Antriebsmotor des Kraftfahrzeugs, vorzugsweise ein Verbrennungsmotor, ist.
• Aspekt 73. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei die erste Pumpe (1) eine Schmierölpumpe und der erste Versorgungskreis (5) ein Schmierölkreis zur Versorgung eines Verbrennungsmotors des Kraftfahrzeugs mit Schmieröl ist.
• Aspekt 74. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei der erste Fluidverbraucher (4) ein Antriebsmotor des Kraftfahrzeugs ist und wenigstens einer der Versorgungskreise (6) der Kühlung des Antriebsmotors dient.
• Aspekt 75. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei der zweite Fluidverbraucher (4) eine Stelleinrichtung zur Verstellung einer oder mehrerer Motorkomponenten eines Verbrennungsmotors oder einer oder mehrerer Getriebekomponenten eines Getriebes des Kraftfahrzeugs ist.
• Aspekt 76. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei ein oder mehrere Nockenwellensteller zur Verstellung jeweils der Phasenlage einer Nockenwelle und/oder ein oder mehrere Pleuelversteller zur Verstellung jeweils der Länge eines Kurbelwellenpleuels des Verbrennungsmotors die Stelleinrichtung bildet oder gemeinsam bilden.
• Aspekt 77. Fluidversorgungssystem nach einem der zwei unmittelbar vorhergehenden Aspekte, wobei die Stelleinrichtung eine oder mehrere Stellkammern zur Verstellung des Fördervolumens einer der Pumpen (1, 2) aufweist und die Stellkammer oder wenigstens eine der mehreren Stellkammern von der zweiten Pumpe mit Druck beaufschlagbar ist.
• Aspekt 78. Fluidversorgungssystem nach einem der vorhergehenden Aspekte, wobei
  • der erste Fluidverbraucher (3) ein Antriebs-Verbrennungsmotor des Kraftfahrzeugs, die erste Pumpe (1) eine Schmierölpumpe und der erste Versorgungskreis (5) ein Schmierölkreis zur Versorgung des Antriebs-Verbrennungsmotors mit Schmieröl sind,
  • der zweite Fluidverbraucher (4) eine Stelleinrichtung zur Verstellung einer Motorkomponente des Antriebs-Verbrennungsmotors umfasst und
  • die Stelleinrichtung einen oder mehrere Pleuelversteller zur Verstellung jeweils der Länge eines Kurbelwellenpleuels und/oder einen oder mehrere Nockenwellensteller jeweils zur Verstellung der Phasenlage einer Nockenwelle des Antriebs-Verbrennungsmotors und/oder eine oder mehrere Stellkammern einer der Pumpen (1), falls diese im Fördervolumen verstellbar ist, umfasst.
• Aspekt 79. Fluidversorgungssystem nach dem vorhergehenden Aspekt, wobei die Stelleinrichtung zur Verstellung der Motorkomponente, vorzugsweise der zweite Fluidverbraucher (4), von dem oder den Pleuelverstellern und/oder dem oder den Nockenwellenstellern und/oder der einen oder mehreren Stellkammern gebildet wird.

Features of the invention are also described in the aspects formulated below. The aspects are formulated in the form of claims and can replace them. Features disclosed in the aspects can further supplement and / or qualify the claims, show alternatives to individual features and / or expand claim features. Reference symbols placed in brackets relate to an exemplary embodiment illustrated below in the figures. They do not restrict the features described in the aspects in terms of the literal sense as such, but on the other hand show preferred options for realizing the respective feature.

• Aspect 1. Fluid supply system for supplying several fluid consumers of a motor vehicle with fluid, the fluid supply system comprising:
  1. (A) a first pump (1) for supplying a first fluid consumer (3) arranged in a first supply circuit (5) of the motor vehicle with fluid,
  2. (b) a second pump (2) for supplying a second fluid consumer (4) arranged in a second supply circuit (6) of the motor vehicle with fluid, and
  3. (c) a directional valve (7, 8; 15, 8) which is adjustable between a first valve position and at least one other, second valve position,
  4. (d) the directional control valve (7, 8; 15, 8)
     • in the first valve position allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) and
     • in the second valve position separates the first supply circuit (5) from the second pump (2) or a delivery of the fluid from the second pump (2) in the first supply circuit (5) in comparison to the first valve position only allows throttled.
• Aspect 2. Fluid supply system according to the preceding aspect, wherein the directional control valve (7, 8) in the second valve position allows the fluid in the second supply circuit (6) to be conveyed from the second pump (2) to the second fluid consumer (4).
• Aspect 3. Fluid supply system according to one of the preceding aspects, the directional control valve (15; 7, 8) in the first valve position conveying the fluid from the second pump (2) into the first supply circuit (5) and in the direction of the second fluid consumer ( 4), so that the second fluid consumer (4) is only supplied with a lower pressure (P1) compared to the second valve position, or separates the second pump (2) from the second fluid consumer (4).
• Aspect 4. Fluid supply system according to one of the preceding aspects, wherein the directional control valve (7, 8) is arranged downstream of the second pump (2) and upstream of the second fluid consumer (4) in the second supply circuit (6).
• Aspect 5. Fluid supply system according to one of the preceding aspects, wherein the directional control valve (7, 8) has a pressure connection for the second pump (2), a first working connection for the first supply circuit (5) and a second working connection located in the second supply circuit (6) and selectively connects the pressure port either to the first working port or to the second working port.
• Aspect 6. Fluid supply system according to one of the preceding aspects, wherein the directional control valve (7, 8) is a 3/2-way valve.
• Aspect 7. Fluid supply system according to one of aspects 1 to 3, wherein a connecting line (11) branches off from the second supply circuit (6) at a junction (11 ') downstream of the second pump (2) and upstream of the second fluid consumer (4) to the to connect the first supply circuit (5) to the second supply circuit (6), and wherein the directional control valve (15) is arranged downstream of the junction (11 ') in the connecting line (11).
• Aspect 8. Fluid supply system according to the preceding aspect, wherein the directional control valve (15) has a pressure connection for the second pump (2) and a working connection for the first supply circuit (5) and the pressure connection either connects to the working connection or separates it from the second working connection.
• Aspect 9. Fluid supply system according to one of the two immediately preceding aspects, wherein the directional valve (15) is a 2/2-way valve.
• Aspect 10. Fluid supply system according to one of the preceding aspects, wherein the directional control valve (7; 15) is a controllable solenoid valve
• Aspect 11. Fluid supply system according to one of the preceding aspects, wherein the directional control valve (7; 15) comprises a valve spring (7a; 15a) which acts on the directional control valve (7; 15) in the direction of one of the valve positions, preferably in the direction of the first valve position , works.
• Aspect 12. Fluid supply system according to the preceding aspect, wherein the directional control valve (7; 15) has an electromagnet device (7b; 15b) for generating an electromotive force counteracting the valve spring (7a; 15a).
• Aspect 13. Fluid supply system according to one of the preceding aspects, comprising an adjusting valve (8) for adjusting a second pressure (P2) prevailing in the second supply circuit to a predetermined or predeterminable pressure level, preferably to limit the second pressure (P2) to a maximum value.
• Aspect 14. Fluid supply system according to the preceding aspect, wherein the adjusting valve (8) can be acted upon for adjusting the second pressure (P2) with a fluid adjusting pressure, for example the second pressure (P2).
• Aspect 15. Fluid supply system according to the preceding aspect, wherein the fluid control pressure depends on the second pressure (P2).
• Aspect 16. Fluid supply system according to the preceding aspect, wherein the fluid control pressure corresponds to the second pressure (P2).
• Aspect 17. Fluid supply system according to one of the three immediately preceding aspects, wherein the adjusting valve (8) comprises a valve spring (8a) which counteracts the fluid adjusting pressure.
• Aspect 18. Fluid supply system according to one of the four immediately preceding aspects, wherein a return line (8b) branches off from the second supply circuit (6), preferably downstream of the adjusting valve (8), and leads into a pressure chamber of the adjusting valve (8) to the adjusting valve (8 ) to apply a pressure prevailing in the second supply circuit (6), preferably directly to the second pressure (P2) to be set.
• Aspect 19. Fluid supply system according to one of aspects 13 to 17, wherein the adjusting valve (8) is adjustable between a first valve position and at least one other, second valve position and, in its first valve position, a delivery of the fluid from the second pump (2) to the first Supply circuit (5) allows and in its second valve position separates the first supply circuit (5) from the second pump (2) or a delivery of the fluid from the second pump (2) into the first supply circuit (5) is only throttled compared to the first valve position allows.
• Aspect 20. Fluid supply system according to one of aspects 13 to 18, wherein the adjusting valve (8) is adjustable between a first valve position and at least one other, second valve position and, in its second valve position, a delivery of the fluid from the second pump (2) to the second Fluid consumer (4) and, in its first valve position, allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) in order to set the second pressure (P2), for example to limit it.
• Aspect 21. Fluid supply system according to aspect 19 or aspect 20, wherein the adjusting valve (8) separates the second pump (2) from the second fluid consumer (4) or a delivery of the fluid from the second pump (2) to the second fluid consumer (4) only allows throttled compared to the second valve position when the adjusting valve (8) is in its first valve position.
• Aspect 22. Fluid supply system according to one of Aspects 19 to 21, wherein the adjusting valve (8) separates the second pump (2) from the second fluid consumer (4) when the adjusting valve (8) assumes its first valve position.
• Aspect 23. Fluid supply system according to one of Aspects 19 to 22, wherein the adjusting valve (8) comprises a valve spring (8a) which acts in the direction of the second valve position of the adjusting valve (8).
• Aspect 24. Fluid supply system according to one of aspects 19 to 23, wherein the adjusting valve (8) in its first valve position separates the second fluid consumer (4) from the directional control valve (7).
• Aspect 25. Fluid supply system according to one of aspects 19 to 24, wherein the adjusting valve (8) in its second valve position separates the first supply circuit (5) from the directional control valve (7).
• Aspect 26. Fluid supply system according to one of aspects 19 to 25, wherein the adjusting valve (8) in its second valve position connects the second fluid consumer (4) to the directional control valve (7).
• Aspect 27. Fluid supply system according to one of aspects 19 to 26, wherein the second pump (2) is connected to the first supply circuit (5) when the directional control valve (7; 15) is in its first valve position and / or the adjustment valve (8) is in its first Valve position takes or take each time.
• Aspect 28. Fluid supply system according to one of aspects 19 to 27, wherein the second pump (2) is only separated from the first supply circuit (5) when the directional control valve (7; 15) and the adjusting valve (8) each assume their second valve position.
• Aspect 29. Fluid supply system according to one of aspects 13 to 28, wherein the directional control valve (7) in its first valve position separates the adjusting valve (8) from the second pump (2).
• Aspect 30. Fluid supply system according to one of aspects 13 to 29, wherein the directional control valve (7) in its first valve position allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) by bypassing the adjusting valve (8).
• Aspect 31. Fluid supply system according to one of aspects 13 to 30, wherein the directional control valve (7) in its second valve position connects the adjusting valve (8) to the second pump (2).
• Aspect 32. Fluid supply system according to one of aspects 13 to 31, wherein the adjusting valve (8) has a pressure connection for the second pump (2), a first working connection for the first supply circuit (5) and a second working connection located in the second supply circuit (6) and connects the pressure port either to the first working port or to the second working port.
• Aspect 33. Fluid supply system according to the preceding aspect and aspect 5, wherein the second working connection of the directional control valve (7) is connected to the pressure connection of the adjusting valve (8).
• Aspect 34. Fluid supply system according to one of Aspects 13 to 33, wherein the adjusting valve (8) is arranged in the second supply circuit (6)
• Aspect 35. Fluid supply system according to one of aspects 13 to 34, wherein the directional control valve (7) and the adjusting valve (8) are arranged in series in the second supply circuit (5).
• Aspect 36. Fluid supply system according to one of aspects 13 to 35, wherein the directional control valve (7) is arranged in the second supply circuit (5) upstream of the adjusting valve (8).
• Aspect 37. Fluid supply system according to one of aspects 13 to 36, wherein the adjusting valve (8) is a directional valve, for example a 3/2-way valve.
• Aspect 38. The fluid supply system according to any one of aspects 13 to 37, wherein the adjusting valve (8) is a fluidic valve.
• Aspect 39. Fluid supply system according to one of aspects 13 to 38, wherein the adjusting valve (8) for adjusting the second pressure (P2) can be acted upon with a fluid adjusting pressure and the fluid adjusting pressure on the adjusting valve (8) in the direction of one of the valve positions, preferably in the direction acts on the first valve position.
• Aspect 40. Fluid supply system according to one of the preceding aspects, comprising a pressure relief valve (9) arranged in the first supply circuit (5) for limiting a first pressure (P1) prevailing in the first supply circuit (5) to a predetermined or predeterminable pressure level, preferably to limit the first Pressure (P1) to a maximum value.
• Aspect 41. Fluid supply system according to the preceding aspect, wherein the pressure limiting valve (9) arranged in the first supply circuit (5) can be acted upon by a fluid control pressure, for example the first pressure (P1), to limit the first pressure (P1).
• Aspect 42. The fluid supply system according to the preceding aspect, wherein the fluid control pressure depends on the first pressure (P1).
• Aspect 43. The fluid supply system according to the preceding aspect, wherein the fluid control pressure corresponds to the first pressure (P1).
• Aspect 44. Fluid supply system according to one of aspects 40 to 43, wherein a return line (9b) branches off from the first supply circuit (5), preferably downstream of the pressure relief valve (9), and leads into a pressure chamber of the pressure relief valve (9) to the pressure relief valve (9 ) with an im first supply circuit (5) prevailing pressure, preferably directly to the first pressure to be set (P1).
• Aspect 45. Fluid supply system according to one of aspects 40 to 44, wherein the pressure limiting valve (9) arranged in the first supply circuit (5) comprises a valve spring (9a) which counteracts the fluid control pressure.
• Aspect 46. Fluid supply system according to one of aspects 40 to 45, wherein the pressure relief valve (9) arranged in the first supply circuit (5) has a pressure connection for the first pump (1), a first working connection located in the first supply circuit (5) and one with a reservoir (R) has a second working port connected for the fluid and connects the pressure port either to the first working port or to the second working port.
• Aspect 47. Fluid supply system according to one of aspects 40 to 46, wherein the second pump (2) can be connected to the first supply circuit (5) via the directional control valve (7, 8; 15) downstream of the pressure relief valve (9) arranged in the first supply circuit (5) is.
• Aspect 48. Fluid supply system according to one of one of aspects 40 to 47, wherein the pressure limiting valve (9) arranged in the first supply circuit (5) is a directional valve, for example a 3/2-way valve.
• Aspect 49. Fluid supply system according to one of one of aspects 40 to 48, wherein the pressure limiting valve (9) arranged in the first supply circuit (5) is a fluidic valve.
• Aspect 50. Fluid supply system according to one of aspects 40 to 49, wherein the pressure-limiting valve (9) arranged in the first supply circuit (5) is adjustable between a first valve position and at least one other, second valve position and, in its first valve position, a delivery of the fluid from the first Pump (1) to the first fluid consumer (3) and, in its second valve position, allows the fluid to be conveyed in the direction of a reservoir (R), preferably directly in the vicinity of the setting valve (9), in order to set the first pressure (P1), for example to limit.
• Aspect 51. Fluid supply system according to one of the preceding aspects, wherein one of the supply circuits (5, 6), preferably the first supply circuit (5), requires a greater volume flow than the other of the supply circuits (5, 6) and that of the pumps (1, 2 ), which is arranged in the supply circuit (5) which requires the larger volume flow, preferably has a larger specific delivery volume than the other of the pumps (1, 2).
• Aspect 52. Fluid supply system according to one of the preceding aspects, wherein the specific delivery volume of one of the pumps (1, 2), preferably the first pump (1), is greater than the specific delivery volume of the other of the pumps (1, 2).
• Aspect 53. Fluid supply system according to one of the preceding aspects, wherein the delivery volume of the first pump (1) and / or the second pump (2) is or are respectively adjustable.
• Aspect 54. Fluid supply system according to one of the preceding aspects, wherein one of the supply circuits (5, 6), preferably the second supply circuit (6), requires a higher pressure than the other of the supply circuits (5, 6) and that of the pumps (1, 2 ), which is arranged in the supply circuit (5) that requires the higher pressure, preferably against a higher counter pressure than the other of the pumps (1, 2) can deliver.
• Aspect 55. Fluid supply system according to one of the preceding aspects, wherein one of the pumps (1, 2), preferably the second pump (2), can deliver against a higher counter pressure than the other of the pumps (1, 2).
• Aspect 56. Fluid supply system according to one of the preceding aspects, wherein at least one of the pumps (1, 2), preferably the second pump (2), is a fixed displacement pump.
• Aspect 57. Fluid supply system according to one of the preceding aspects, wherein one of the pumps (1, 2), preferably the first pump (1), is in the delivery volume adjustable and the other of the pumps (1, 2), preferably the second pump (2), is a fixed displacement pump.
• Aspect 58. Fluid supply system according to one of the preceding aspects, wherein at least one of the pumps (1, 2), preferably the first pump (1), is a vane pump, preferably a vane pump.
• Aspect 59. Fluid supply system according to one of the preceding aspects, wherein at least one of the pumps (1, 2), preferably the second pump (2), is a gear pump, preferably an external gear pump.
• Aspect 60. Fluid supply system according to one of the preceding aspects, wherein one of the pumps (1, 2), preferably the first pump (1), is a vane pump and the other of the pumps (1, 2), preferably the second pump (2), is a Gear pump is.
• Aspect 61. Fluid supply system according to one of the preceding aspects, wherein the first pump (1) has a rotatable first delivery member and the second pump (2) has a rotatable second delivery member, and these delivery members are arranged on a common drive shaft (10).
• Aspect 62. Fluid supply system according to one of the preceding aspects, wherein the first conveying member and the second conveying member are arranged to be rotatable about the same axis of rotation.
• Aspect 63. Fluid supply system according to one of the preceding aspects, wherein the first pump (1) and / or the second pump (2) in a fixed, preferably identical, speed relationship of a motor, preferably the unit (3) arranged in the first supply circuit (5) , the motor vehicle is or are driven.
• Aspect 64. Fluid supply system according to one of the preceding aspects, wherein the first pump (1) and the second pump (2) are arranged in a common pump housing.
• Aspect 65. Fluid supply system according to the preceding aspect, the pump housing having a first suction connection for the first pump (1) and a second suction connection for the second pump (2) on the outside.
• Aspect 66. Fluid supply system according to one of the preceding aspects, wherein the first pump (1) and the second pump (2) are connected to a common reservoir (R) on a low-pressure side.
• Aspect 67. Fluid supply system according to the preceding aspect, wherein fluid flows off from the first supply circuit (5) and / or from the second supply circuit (6) into the reservoir (R).
• Aspect 68. Fluid supply system according to one of the preceding aspects, comprising a blocking device (12) which is arranged in a connecting line (11) downstream of the directional valve (7; 15) and upstream of the first supply circuit (5) and a delivery via the directional valve (7 ; 15) in the direction of the first supply circuit (5) only when a pressure that is fixedly predetermined or adjustable by means of the blocking device (12) is exceeded.
• Aspect 69. Fluid supply system according to the preceding aspect, the second fluid consumer (4) being precharged to a specific pressure by means of the blocking device (12), for example the pressure which is fixed or adjustable by means of the blocking device (12).
• Aspect 70. Fluid supply system according to one of the preceding aspects, comprising a blocking device (12) which is arranged in a connecting line (11) downstream of the second pump (2), preferably downstream of the directional control valve (7; 15), and upstream of the first supply circuit (5) is arranged and prevents a backflow of fluid in the direction of the second supply circuit (6) and is, for example, a check valve.
• Aspect 71. Fluid supply system according to one of the preceding aspects in combination with aspect 13, comprising a blocking device (14) which is arranged in a connecting line (13) downstream of the adjusting valve (8) and upstream of the first supply circuit (5) and a return flow of fluid in the direction on the second supply circuit (6) and is, for example, a check valve.
• Aspect 72. Fluid supply system according to one of the preceding aspects, wherein the first fluid consumer (3) is a drive motor of the motor vehicle, preferably an internal combustion engine.
• Aspect 73. Fluid supply system according to one of the preceding aspects, wherein the first pump (1) is a lubricating oil pump and the first supply circuit (5) is a lubricating oil circuit for supplying an internal combustion engine of the motor vehicle with lubricating oil.
• Aspect 74. Fluid supply system according to one of the preceding aspects, wherein the first fluid consumer (4) is a drive motor of the motor vehicle and at least one of the supply circuits (6) is used to cool the drive motor.
• Aspect 75. Fluid supply system according to one of the preceding aspects, wherein the second fluid consumer (4) is an adjusting device for adjusting one or more engine components of an internal combustion engine or one or more transmission components of a transmission of the motor vehicle.
• Aspect 76. Fluid supply system according to the preceding aspect, wherein one or more camshaft adjusters for adjusting the phase position of a camshaft and / or one or more connecting rod adjusters for adjusting the length of a crankshaft connecting rod of the internal combustion engine forms or jointly form the adjusting device.
• Aspect 77. Fluid supply system according to one of the two immediately preceding aspects, wherein the adjusting device has one or more adjusting chambers for adjusting the delivery volume of one of the pumps (1, 2) and the adjusting chamber or at least one of the several adjusting chambers can be pressurized by the second pump.
• Aspect 78. The fluid supply system of any one of the preceding aspects, wherein
  • the first fluid consumer (3) is an internal combustion engine of the motor vehicle, the first pump (1) is a lubricating oil pump and the first supply circuit (5) is a lubricating oil circuit for supplying the internal combustion engine with lubricating oil,
  • the second fluid consumer (4) comprises an adjusting device for adjusting an engine component of the internal combustion engine, and
  • the adjusting device has one or more connecting rod adjusters for adjusting the length of a crankshaft connecting rod and / or one or more camshaft adjusters for adjusting the phase position of a camshaft of the internal combustion engine and / or one or more adjusting chambers of one of the pumps (1), if the delivery volume is adjustable is, includes.
• Aspect 79. Fluid supply system according to the preceding aspect, wherein the adjusting device for adjusting the engine component, preferably the second fluid consumer (4), is formed by the connecting rod adjusters and / or the camshaft adjusters and / or the one or more adjusting chambers.

An exemplary embodiment of the invention is explained below with reference to figures. Features that become apparent in the exemplary embodiments further advantageously develop - individually and in any combination of features - the subject matter of the claims and the above aspects, as well as the embodiments described above. Show it:

Figure 1 a fluid supply system of a first embodiment, and Figure 2 a fluid supply system of a second embodiment.

Figure 1 shows a fluid supply system of a first embodiment. The fluid supply system comprises a first pump 1, which supplies a first fluid consumer 3 with fluid in a first supply circuit 5. The fluid consumer 3 can be, for example, an internal combustion engine for driving a motor vehicle. The fluid can in particular be lubricating oil and the supply circuit 5 can accordingly be a lubricating oil circuit for supplying the fluid consumer 3 with lubricating oil. The fluid can additionally also serve to cool the fluid consumer 3, for example to cool the pistons of the fluid consumer 3 if this is designed as an internal combustion engine. Pump 1 is for it set up to convey the fluid in the first circuit 5 with at least one first volume flow V1 and at least one first supply pressure P1. The volume flow V1 and the supply pressure P1 can be, for example, the volume flow and the supply pressure in the main oil gallery of an internal combustion engine. The pump 1 can be set up to supply the volume flow and supply pressure required by the fluid consumer 3 for lubrication and / or cooling over the entire operating range of the fluid consumer 3 on its own.

The pump 1 can, as shown, be a pump with adjustable delivery volume, so that a volume flow delivered by the pump 1 can be adapted to an actual demand of the fluid consumer 3 that varies during operation by adjusting the delivery volume of the pump 1. The pump 1 can in principle be a linear stroke pump, but it is preferably designed as a rotary pump. Gear pumps, pendulum vane pumps and basically all types of rotary pumps can be used as rotary pumps. The pump 1 is preferably a vane pump.

The fluid supply system also includes a second pump 2, which is used to supply a second fluid consumer 4 arranged in a second supply circuit 6 with the fluid. If the first fluid consumer 3 is an internal combustion engine with piston cooling, for example the first supply circuit 5 can form the lubricating oil circuit and the second supply circuit 6 can form a piston cooling circuit, i.e. the pump 2 can be used to supply the pistons with the fluid as a coolant. Alternatively, the second fluid consumer 4 can be one or more camshaft adjusters for adjusting the phase position of one or more camshafts. In a further alternative, a connecting rod adjuster or several connecting rod adjusters can jointly form the fluid consumer 4. In such designs, the fluid serves as a working fluid for actuating the respective camshaft adjuster or connecting rod adjuster. One or more camshaft adjusters and one or more connecting rod adjusters, optionally also one or more piston cooling nozzles, can also jointly form the fluid consumer 4. The respective camshaft adjuster and respective connecting rod adjuster can be supplied with the fluid, ie pressurized, jointly in such designs, preferably via downstream valves (not shown in the figure) by means of the second pump 2. In another variant, the second pump 2 can adjust the delivery volume first pump 1 serve. If the first pump 1 is designed as an adjustable pump, as in the exemplary embodiment, and if it comprises a fluidically actuable adjusting device for adjusting its delivery volume, for example one or more adjusting chambers within a pump housing, the second fluid consumer 4 can be this adjusting device of the pump 1 or the adjusting device of the pump 1 in addition to the camshaft adjuster (s) and / or the connecting rod adjuster (s).

The second pump 2 is set up to deliver the fluid with a second volume flow V2 or greater and a second supply pressure P2 or greater. The supply pressure P2 can in particular be a nominal working pressure for the actuation of one or more camshaft adjusters and / or one or more connecting rod adjusters and / or one or more piston cooling nozzles and / or an actuating device of the pump 1. The volume flow V2 is the volume flow established at the supply pressure P2, which is required for an adequate supply of the fluid consumer 4. The volume flow V2 can, for example, be a pure holding flow which is just sufficient to compensate for unavoidable leakages.

The second pump 2 can be designed as a linear stroke pump or, as preferred, as a rotary pump. In the embodiment as a rotary pump, it can be, for example, a gear pump, in particular an external or internal gear pump, or a pendulum slide pump or a vane pump. The second pump 2 is preferably a gear pump and particularly preferably an external gear pump. In simple, not least therefore preferred designs, the delivery volume of the pump 2 cannot be adjusted, i.e. it is designed as a fixed displacement pump. In principle, however, it can instead be designed as a pump with adjustable delivery volume.

The pumps 1 and 2 deliver the fluid from a common reservoir R. The supply circuits 5 and 6 each have a low-pressure side and a high-pressure side. The low-pressure side of the circuit 5 extends from the reservoir R to the pump 1. The high-pressure side of the circuit 5 extends from the pump 1 to the most downstream point of consumption of the fluid consumer 3. From the fluid consumer 3, the pressure-relieved fluid flows, as indicated in the figure, back into the reservoir R. The low pressure side of the circuit 6 extends from the reservoir R to the pump 2, and the high pressure side of the circuit 6 extends from the pump 2 to the or the multiple consumption points of the fluid consumer 4. The fluid can, but does not have to, flow from the fluid consumer 4 back into the reservoir R. The return flow from the fluid consumer 3 and / or an optional return flow from the fluid consumer 4 can take place in particular due to gravity. In Figure 1 a return flow of the fluid to the reservoir R is also indicated for the second fluid consumer 4.

In the second supply circuit 6, a directional control valve 7 is arranged downstream of the pump 2. The directional control valve 7 can be reversed between a first valve position and a second valve position. In Figure 1 the directional control valve 7 assumes the first valve position in which it allows the fluid to be conveyed from the second pump 2 into the first circuit 5 and at the same time separates the fluid consumer 4 from the pump 2. If the directional control valve 7 is moved into the second valve position, it allows the fluid to be conveyed from the pump 2 to the fluid consumer 4 and at the same time separates the pump 2 from the first circuit 5.

The directional valve 7 is designed as a 3/2-way valve and can therefore only be adjusted back and forth between these two valve positions. In modifications, the directional control valve 7 can be reversible between more than two valve positions. In such embodiments, it can have the described first and second valve position and additionally a third valve position. In the optional third valve position, it can, for example, simultaneously connect the pump 2 to the second fluid consumer 4 and the first circuit 5 and, for example, set a specific division ratio. The directional valve 7 is preferably a switching valve that can only be reversed between its different valve positions, but alternatively it can also be designed as a proportional valve, in particular a 3/2-way valve, in order to be able to undertake a continuous division into partial flows.

The directional control valve 7 comprises a valve spring 7a and an electromagnetic device 7b. It is designed accordingly as a solenoid valve. By means of the solenoid device 7b, the directional control valve 7 can optionally be reversed into the different, in the exemplary embodiment two valve positions, and thus the fluid consumer 4 can be optionally connected to or separated from the second pump 2. Likewise, the pump 2 can optionally be connected to and separated from the first circuit 5 by means of the directional control valve 7. The valve spring 7a acts on a valve piston of the directional valve 7 with a spring force acting in the direction of the first valve position. The solenoid device 7b contributes Current application of the spring force in the opposite direction towards the second valve position. If the directional control valve 7 is not energized, it assumes the first valve position, as shown. When energized, it is switched to the second valve position. The solenoid device 7b can be connected, for example, to a higher-level motor controller in order to be able to carry out the reversing process in adaptation to the requirements of the fluid consumer 4.

The fluid supply system further comprises an adjusting valve 8, which is also arranged downstream of the pump 2 and, as is preferred, also downstream of the directional control valve 7 in the second circuit 6. Alternatively, the adjusting valve 8 can be arranged upstream of the directional control valve 7. The setting valve 8 is used to set the supply pressure P2 for the fluid consumer 4. The setting valve 8 is also designed as a directional valve, for example as a 3/2-way valve. It can be switched between a first valve position and a second valve position. In the first valve position, it establishes a connection between the second circuit 6 and the first circuit 5 and separates the fluid consumer 4 from the pump 2. In Figure 1 the adjusting valve 8 assumes the second valve position in which it separates the pump 2 from the first circuit 5 and allows the fluid to be conveyed from the pump 2 to the fluid consumer 4.

The adjusting valve 8 comprises a valve spring 8a which acts on a valve piston of the adjusting valve 8 with a spring force acting in the direction of the second valve position. The adjusting valve 8 is designed as a fluidic valve. A fluid control pressure, which depends on a pressure prevailing in the second circuit 6, acts against the spring force of the valve spring 8a on the valve piston in the direction of the first valve position. For this purpose, a return line 8b branches off from the second circuit 6, via which the fluid under pressure P2 is directed to the valve piston. The fluid control pressure corresponds at least essentially to the pressure P2. With respect to the adjusting valve 8, the return line 8b can be designed as an external or, as preferred, as an internal return line 8b. The return line 8b preferably branches off from the second circuit 6 downstream of the adjusting valve 8. The adjusting valve 8 itself can also have an electromagnet device comparable to the electromagnet device 7b in order to support the valve spring 8a or, preferably, the fluid adjusting pressure. In the exemplary embodiment, however, as preferred, the setting valve 8 is designed as a pure fluidic valve, without an electromagnetic device. Accordingly, only the spring force of the valve spring 8a and the latter act against the fluid control pressure on its valve piston.

The valve spring 8a and the piston surface of the valve piston, on which the fluid control pressure acts, are matched to one another in such a way that the maximum second supply pressure P2 is set in the second circuit 6 between the control valve 8 and the fluid consumer 4. In the interaction of the valve spring 8a and the returned fluid pressure, the second supply pressure P2 is thus limited to a predetermined maximum value. If the pressure P2 exceeds the maximum value, the adjusting valve 8 controls from the illustrated second valve position into the first valve position, in which it separates the fluid consumer 4 from the pump 2 and instead allows delivery to the first circuit 5.

The valves 7 and 8 each have an inlet or pressure connection and two outlets or working connections. The directional valve 7 can, as shown, be permanently connected to the second pump 2 at its pressure connection. It can follow the pump 2 immediately downstream, for example it can also be an integral part of the pump 2. The directional valve 7 can be connected at one of its working connections to the fluid consumer 4, in the exemplary embodiment via the downstream adjusting valve 8. At the other of the working connections, it can be connected to the first supply circuit 5 via a connecting line 11. The adjusting valve 8 is connected at its pressure connection to the second pump 2, in the exemplary embodiment via the upstream directional valve 7. The fluid consumer 4 is connected to one of the working connections of the adjusting valve 8. The other of the working connections of the adjusting valve 8 is connected to the first supply circuit 5 via a connecting line 13.

A blocking device 12 is arranged in the connecting line 11, which only allows a flow in the direction of the first supply circuit 5 and prevents a return flow from the first supply circuit 5 into the second supply circuit 6. The blocking device 12 can in particular, as shown, be a check valve.

A blocking device 14 is arranged in the connecting line 13, which only allows a flow in the direction of the first supply circuit 5 and prevents a return flow from the first supply circuit 5 into the second supply circuit 6. The blocking device 14 can in particular, as shown, be a check valve.

A pressure limiting valve 9 can be arranged in the first supply circuit 5 in order to limit the first supply pressure P1, in particular in the case of cold and therefore viscous fluid, if the fluid is an oil. The first pressure P1 can preferably be limited to a predetermined maximum value by means of the pressure limiting valve 9. The pressure limiting valve 9 can be designed as a directional valve, for example as a 3/2-way valve. In designs as a directional valve, the pressure limiting valve 9 can be reversible between a first valve position and a second valve position. In the figure, the pressure limiting valve 9 assumes the first valve position in which it allows the fluid to be conveyed from the first pump 1 to the fluid consumer 3. In its second valve position, the pressure relief valve 9 interrupts the connection between the pump 1 and the fluid consumer 3 and instead connects the pump 1 to the reservoir R. The pressure relief valve 9 has a pressure connection for connection to the pump 1 and a working connection for the connection of the fluid consumer 3 and a further working connection for the delivery to the reservoir R. This further connection can simply lead into the vicinity of the pressure limiting valve 9, as long as care is taken that the fluid can flow off to the reservoir R via the further working connection.

Like the directional control valve 7 and the setting valve 8, the pressure limiting valve 9 comprises a valve piston which can be moved back and forth and a valve spring 9a which acts on the valve piston. In the exemplary embodiment, the valve spring 9a acts on the valve piston in the direction of the first valve position which the pressure limiting valve 9 assumes in the figure. A fluid pressure prevailing in the first circuit 5 counteracts the valve spring 9a. For this purpose, a return line 9b branches off from the first supply circuit 5, via which the fluid can be brought to act on the valve piston. The pressure limiting valve 9 is designed as a pure fluidic valve. The return line 9b branches off, as preferred, but only by way of example, downstream of the pressure limiting valve 9 from the first circuit 5. The return line 9b can be provided externally to the pressure limiting valve 9 or, more preferably, be an integral part of the pressure limiting valve 9.

The second pump 2 can be connected to the first supply circuit 5 via the directional control valve 7 and the connecting line 11. The fluid conveyed by the pump 2 can advantageously be conveyed into the first circuit 5 downstream of the pressure limiting valve 9 become. For this purpose, the connecting line 11 is connected to the first circuit 5 downstream of the pressure limiting valve 9.

The pump 2 can be connected to the first supply circuit 5 via the setting valve 8 and the connecting line 13. As in the exemplary embodiment, it can preferably be connected to the first circuit 5 downstream of the pressure limiting valve 9. For this purpose, the connecting line 13 is connected to the first circuit 5 downstream of the pressure limiting valve 9. The connecting line 13 is advantageously connected to the first circuit 5 downstream of the connecting line 11.

The pumps 1 and 2 are driven in a fixed speed relationship by the drive motor of the vehicle, which can be an internal combustion engine or an electric motor. In such designs, the pumps 1 and 2 can be driven via separate drive trains, but each with a fixed speed relationship. As preferred, however, a feed rotor of the first pump 1 and a feed rotor of the second pump 2 are arranged coaxially on a common drive shaft 10, which in turn is driven by the drive motor of the vehicle. They are therefore driven in a fixed and equal speed relationship.

The pumps 1 and 2 can have separate pump housings. When the delivery members are arranged on a common drive shaft, as in the exemplary embodiment, designs in which the pumps 1 and 2 have a common pump housing are also advantageous. If this is the case, the pumps 1 and 2 are separated from one another at least on the outlet side or high pressure side, that is to say each have their own outlet. On the low-pressure side, they can have a common inlet or, as preferred, also have separate inlets in the case of a common pump housing.

Figure 2 shows a fluid supply system of a second embodiment, which differs from the first embodiment only in the arrangement of the electromagnetically actuated directional control valve. In the first exemplary embodiment, the directional control valve 7 can interrupt the connection between the second pump 2 and the second fluid consumer 4. The fluid supply system of the second embodiment comprises, instead of the directional control valve 7 arranged in the second supply circuit 6, a directional control valve 15, which transports the fluid from the second pump affect the second fluid consumer 4, but cannot interrupt. The directional control valve 15 is arranged outside the second supply circuit 6 in this sense.

Apart from the arrangement of the directional valve 15, the fluid supply system of the second exemplary embodiment corresponds to the fluid supply system of the first exemplary embodiment. The pumps 1 and 2, the fluid consumers 3 and 4, the valves 8 and 9, the blocking devices 12 and 14 and the connecting line 13 can be designed and arranged exactly as in the first exemplary embodiment. In this regard, reference is made to the statements relating to the first exemplary embodiment.

In the second exemplary embodiment, the connecting line 11 branches off from the second supply circuit 6 at a junction 11 ′ and the directional control valve 15 is arranged in the connecting line 11 downstream of the junction 11 ′. The connecting line 11 is connected to the first supply circuit 5 downstream of the directional control valve 15, as in the first exemplary embodiment. As in the first exemplary embodiment, a blocking device 12 can be arranged in the connecting line 11 downstream of the directional control valve 15.

The directional valve 15 is adjustable between a first valve position and a second valve position. In the first valve position, the directional control valve 15 allows the fluid to be conveyed from the second pump 2 into the first supply circuit 5. In Figure 2 the directional control valve 15 assumes the first valve position. In the second valve position, it separates the first supply circuit 5 from the second supply circuit 6 and thus also from the pump 2. In contrast to the directional valve 7 of the first embodiment, the directional valve 15 allows the fluid to be conveyed from the second pump 2 to the second fluid consumer 4 not only in the second valve position, but also in the first valve position. If the directional control valve assumes the first valve position, the fluid delivered by the second pump 2 can flow into the first supply circuit 5, so that the typically lower supply pressure P1 of the first supply circuit 5 is set in the second supply circuit 6. The fluid consumer 4 can therefore be precharged with the supply pressure P1. This can be advantageous in order to shorten the response time in the event of a suddenly higher pressure requirement of the second consumer 4.

As in the exemplary embodiment, the blocking device 12 can serve to prevent fluid from flowing back from the first into the second supply circuit. Accordingly, it can be a simple check valve. In further developments, the pre-charge pressure can be specified by means of the blocking device 12, which is established in the second supply circuit 6 when the directional control valve 15 assumes the first valve position. The pre-charge pressure can be a few bar, for example 5 bar. If the fluid consumer 4 has to be supplied with a higher pressure P2, only the pressure difference P2 - precharge pressure has to be built up in the second supply circuit 6. The response time of the fluid consumer 4 is correspondingly shortened in comparison to the fluid supply without pre-charging.

In a further development, the blocking device 12 can be set up to change the precharge pressure in adaptation to the second fluid consumer 4 and / or the first fluid consumer 3, i. H. to be adjusted as required. The blocking device 12 can be set up to only specify a precharge pressure or only to prevent a backflow into the second supply circuit 6. However, it can advantageously also be set up to predetermine a pre-charge pressure in a fixed or changeable manner and to prevent the backflow.

The directional control valve 15 comprises a valve spring 15a and an electromagnetic device 15b. It is designed accordingly as a solenoid valve. By means of the solenoid device 15b, the directional control valve 15 can optionally be reversed into the different valve positions, in the exemplary embodiment 2, and thus the first supply circuit 5 can be optionally connected to or separated from the second supply circuit 6. The valve spring 15a acts on a valve piston of the directional valve 15 with a spring force acting in the direction of the first valve position. When a current is applied, the electromagnetic device 15b counteracts the spring force in the direction of the second valve position. If the directional control valve 15 is not energized, it takes, as in Figure 2 shown, the first valve position. When energized, it is switched to the second valve position. The solenoid device 15b can be connected, for example, to a higher-level motor controller in order to be able to carry out the reversing process in adaptation to the requirements of the fluid consumer 4.

As in the exemplary embodiment, the directional valve 15 can only be designed with two connections, namely a pressure connection and a working connection. At the pressure connection, it is connected to the second supply circuit 6 via the connecting line 11, as preferably upstream of the setting valve 8. At the working connection, it is connected to the first supply circuit 5, as preferably downstream of the pressure limiting valve 9.

Claims (15)

Fluid supply system for supplying several fluid consumers of a motor vehicle with fluid, the fluid supply system comprising: (A) a first pump (1) for supplying a first fluid consumer (3) arranged in a first supply circuit (5) of the motor vehicle with fluid, (b) a second pump (2) for supplying a second fluid consumer (4) arranged in a second supply circuit (6) of the motor vehicle with fluid, and (c) a directional valve (7, 8; 15, 8) which is adjustable between a first valve position and at least one other, second valve position and preferably comprises an electromagnetic device (7b; 15b) for the adjustment, (d) the directional control valve (7, 8; 15, 8) - in the first valve position allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) and - in the second valve position separates the first supply circuit (5) from the second pump (2) or only allows delivery of the fluid from the second pump (2) to the first supply circuit (5) in a restricted manner compared to the first valve position. Fluid supply system according to the preceding claim, wherein the directional valve (7, 8) in the second valve position allows the fluid in the second supply circuit (6) to be conveyed from the second pump (2) to the second fluid consumer (4). Fluid supply system according to one of the preceding claims, wherein the directional valve (15; 7, 8) in the first valve position allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) and in the direction of the second fluid consumer (4) , so that the second fluid consumer (4) with only one compared to the second valve position lower pressure (P1) is supplied, or the second pump (2) disconnects from the second fluid consumer (4). Fluid supply system according to one of the preceding claims, wherein the directional control valve (7, 8) is arranged downstream of the second pump (2) and upstream of the second fluid consumer (4) in the second supply circuit (6). Fluid supply system according to one of claims 1 to 3, wherein a connecting line (11) branches off from the second supply circuit (6) at a junction (11 ') downstream of the second pump (2) and upstream of the second fluid consumer (4) in order to connect the first supply circuit ( 5) to be connected to the second supply circuit (6), and wherein the directional control valve (15) is arranged downstream of the junction (11 ') in the connecting line (11). Fluid supply system according to one of the preceding claims, comprising an adjusting valve (8) for adjusting a second pressure (P2) prevailing in the second supply circuit to a predetermined or predeterminable pressure level, preferably for limiting the second pressure (P2) to a maximum value, the adjusting valve (8 ) can preferably be acted upon with a fluid control pressure for setting the second pressure (P2). Fluid supply system according to the preceding claim, wherein the adjusting valve (8) is adjustable between a first valve position and at least one other, second valve position and, in its first valve position, allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) and in its second valve position separates the first supply circuit (5) from the second pump (2) or only allows delivery of the fluid from the second pump (2) to the first supply circuit (5) in a restricted manner compared to the first valve position. Fluid supply system according to one of the two immediate claims, wherein the adjusting valve (8) is adjustable between a first valve position and at least one other, second valve position and in its second valve position a delivery of the fluid from the second pump (2) to the second fluid consumer (4) and in its first valve position allows the fluid to be conveyed from the second pump (2) into the first supply circuit (5) in order to set the second pressure (P2), for example to limit it. Fluid supply system according to one of the preceding claims, wherein the directional valve (7) and / or the adjusting valve (8) according to one of claims 6 to 8 is or are each arranged in the second supply circuit (5). Fluid supply system according to one of the preceding claims, wherein one of the supply circuits (5, 6), preferably the first supply circuit (5), requires a larger volume flow than the other of the supply circuits (5, 6) and that of the pumps (1, 2) which is arranged in the supply circuit (5), which requires the larger volume flow, has a larger specific delivery volume than the other of the pumps (1, 2). Fluid supply system according to one of the preceding claims, wherein one of the pumps (1, 2), preferably the first pump (1), is adjustable in the delivery volume and the other of the pumps (1, 2), preferably the second pump (2), is a constant pump . Fluid supply system according to one of the preceding claims, wherein one of the pumps (1, 2), preferably the first pump (1), is a vane pump and the other of the pumps (1, 2), preferably the second pump (2), is a gear pump. Fluid supply system according to one of the preceding claims, wherein the first pump (1) and / or the second pump (2) in a fixed, preferably the same speed relationship is or are driven by a motor, preferably the unit (3) arranged in the first supply circuit (5) of the motor vehicle. Fluid supply system according to one of the preceding claims, comprising a blocking device (12) which is arranged in a connecting line (11) downstream of the directional control valve (7; 15) and upstream of the first supply circuit (5), the blocking device (12) allowing fluid to flow back in the direction of the second supply circuit (6) prevents and / or allows conveyance via the directional control valve (7; 15) in the direction of the first supply circuit (5) only when a pressure that is fixed or adjustable by means of the locking device (12) is exceeded, wherein the second fluid consumer (4), in advantageous embodiments of the fluid supply system, is precharged to a specific pressure by means of the locking device (12), for example the pressure that is fixed or adjustable by means of the locking device (12). Fluid supply system according to one of the preceding claims, wherein - the first fluid consumer (3) is an internal combustion engine of the motor vehicle, the first pump (1) is a lubricating oil pump and the first supply circuit (5) is a lubricating oil circuit for supplying the internal combustion engine with lubricating oil, - The second fluid consumer (4) comprises an adjusting device for adjusting an engine component of the internal combustion engine and - the adjusting device has one or more connecting rod adjusters for adjusting the length of a crankshaft connecting rod and / or one or more camshaft adjusters for adjusting the phase position of a camshaft of the internal combustion engine and / or one or more adjusting chambers of one of the pumps (1, 2), if these Is adjustable in the delivery volume includes.

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