CN220415913U - Vehicle and hydraulic control system - Google Patents

Abstract

The utility model discloses a vehicle and a hydraulic control system. The hydraulic control system comprises a first main oil way and a first switch valve; the first main oil way is used for providing cooling oil for equipment to be cooled; the first main oil way comprises a first branch and a second branch which are arranged in parallel, and the first branch and the second branch are both suitable for being connected with the same equipment to be cooled; the first switch valve is arranged on the second branch and used for controlling the on-off of the second branch. According to the utility model, when the cooling demand of the equipment to be cooled is high, the second branch is started to enhance the cooling effect of the equipment to be cooled, so that the effect of avoiding overheating of the equipment to be cooled is realized; meanwhile, the utility model can be used for cooling among a plurality of devices which are connected in parallel and can be overlapped, thereby effectively reducing the power consumption of two pumps.

Description

Vehicle and hydraulic control system

Technical Field

The utility model relates to the technical field of vehicles, in particular to a vehicle and a hydraulic control system.

Background

During a vehicle switching between different modes of operation, it is necessary to control the corresponding brake braking and the corresponding clutch engagement.

Wherein, the braking of the brake and the engagement of the clutch need to provide pressure through a hydraulic oil circuit to ensure the braking effect of the brake and enable the clutch to be firmly engaged; meanwhile, cooling oil is required to be conveyed to the brake and the clutch through a hydraulic oil way so as to avoid overheating of equipment such as the brake and the clutch which need cooling. Under different working conditions, the cooling capacity required by the equipment to be cooled is different.

In the related art, when the equipment to be cooled needs a working condition with higher cooling capacity, such as a clutch is in a sliding state, the cooling effect of the hydraulic oil circuit to the equipment to be cooled is insufficient, so that the risk of overheating of the equipment to be cooled is caused.

Disclosure of Invention

An object of the present utility model is to provide a new technical solution of a vehicle and a hydraulic control system, which can enhance the cooling effect of a device to be cooled when the cooling demand of the device to be cooled is high, thereby realizing the effect of avoiding overheating of the device to be cooled.

According to a first aspect of the present application, there is provided a hydraulic control system comprising: the cooling device comprises a first main oil way and a first switch valve, wherein the first main oil way is used for providing cooling oil for equipment to be cooled; the first main oil way comprises a first branch and a second branch which are arranged in parallel, and the first branch and the second branch are both suitable for being connected with the same equipment to be cooled; the first switch valve is arranged on the second branch and used for controlling the on-off of the second branch; the first switch valves, the first branch circuits and the second branch circuits are multiple in number and correspond to each other one by one, and the first switch valves can independently control the on-off of the corresponding second branch circuits.

Further, the first switch valve is a slide valve and comprises a first shell, a first communication bridge, a first control end, a first oil inlet end and a first oil outlet end; the first shell is provided with a first sliding cavity; the first communication bridge is arranged in the first sliding cavity in a sliding way and divides the first sliding cavity into a first high-pressure area and a first low-pressure area which are isolated from each other; the first control end is arranged on the first shell and communicated with the first high-pressure area; the first oil inlet end is arranged on the first shell and is communicated with the inlet of the second branch; the first oil outlet end is arranged on the first shell and is communicated with the outlet of the second branch; the first communication bridge can slide to a first position under the action of pressure difference between the first high-pressure area and the first low-pressure area, so that the first oil inlet end and the first oil outlet end are communicated through the first communication bridge.

Further, the hydraulic control system also comprises a second main oil way, a first communication oil way and a first pressure control valve; the second main oil passage is used for providing hydraulic oil for the clutch, wherein the hydraulic oil is used for driving the clutch to switch between an engaged state and a disengaged state; the first control end is connected with the second main oil way through the first communication oil way; the first pressure control valve is arranged on the first communication oil path and is used for controlling the pressure of the first communication oil path.

Further, the hydraulic system also comprises a second main oil way and a coupling oil way; the second main oil way is used for providing hydraulic oil for the clutch, wherein the hydraulic oil is used for driving the clutch to switch between an engaged state and a disengaged state, the inlet of the coupling oil way is connected with the second main oil way, and the outlet of the coupling oil way is connected with the first main oil way.

Further, the hydraulic control system further comprises a second switch valve, wherein the second switch valve is arranged on the coupling oil way and used for controlling the on-off of the coupling oil way.

Further, the second switching valve is a sliding valve and comprises a second shell, a second communication bridge, a second control end, a second oil inlet end and a second oil outlet end; the second shell is provided with a second sliding cavity; the second communication bridge is arranged in the second sliding cavity in a sliding way and divides the second sliding cavity into a second high-pressure area and a second low-pressure area which are isolated from each other; the second control end is arranged on the second shell and communicated with the second high-pressure area; the second oil inlet end is arranged on the second shell and is communicated with the inlet of the coupling oil way; the second oil outlet end is arranged on the second shell and is communicated with the outlet of the coupling oil way; the second communication bridge can slide to a second position under the action of pressure difference between the second high-pressure area and the second low-pressure area, so that the second oil inlet end and the second oil outlet end are communicated through the second communication bridge.

Further, the control system also comprises a second communication oil way, and the second control end is connected with the second main oil way through the second communication oil way.

The second switch valve further comprises a low-pressure end, and the low-pressure end is arranged on the second shell and communicated with the second low-pressure area; the hydraulic control system also comprises a control oil way and a second pressure control valve; the low pressure end is connected with the second main oil way through the control oil way, and the second pressure control valve is controlled on the control oil way and used for controlling the pressure of the control oil way.

Further, the second switch valve further comprises a pressure relief end, and the pressure relief end is arranged on the second shell; the second communication bridge can also slide to a third position under the action of a pressure difference between a second high-pressure area and a second low-pressure area, so that the second oil inlet end and the pressure relief end are communicated through the second communication bridge.

Further, the oil treatment device is installed on the first main oil path, a pressure difference is formed between the upstream of the oil treatment device and the downstream of the oil treatment device, an inlet of the bypass oil path is connected with the upstream of the oil treatment device, an outlet of the bypass oil path is connected with the downstream of the oil treatment device, and the pressure difference valve is arranged on the bypass oil path to control the on-off of the bypass oil path.

Further, the oil treatment device comprises a filter press and/or an oil cooler.

Further, the first main oil circuit further comprises a motor stator cooling branch circuit, a motor rotor cooling branch circuit and a transmission cooling branch circuit; the motor stator cooling branch, the motor rotor cooling branch and the transmission cooling branch are arranged in parallel.

According to a second aspect of the present application there is provided a vehicle comprising the hydraulic control system provided in the first aspect of the present application.

In the embodiment of the application, during operation, in order to cool the equipment to be cooled, the first main oil path conveys cooling oil to the equipment to be cooled through the first branch. When the equipment to be cooled is in the working condition with higher cooling capacity demand, if the clutch is in a sliding state, the second switching valve opens the second branch, and the first main oil way also conveys cooling oil to the equipment to be cooled through the second branch, so that the cooling effect of the equipment to be cooled is improved, and the equipment to be cooled is prevented from overheating. According to the hydraulic control system, when the cooling demand of the equipment to be cooled is high, the second branch is started to enhance the cooling effect of the equipment to be cooled, so that the effect of avoiding overheating of the equipment to be cooled is achieved.

Other features and advantages of the present utility model will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a block diagram of a hydraulic control system according to an embodiment of the present application.

Fig. 2 is an enlarged view of the hydraulic control system at the first and second branches according to an embodiment of the present application.

Fig. 3 is an enlarged view of a bypass oil passage of the hydraulic control system according to an embodiment of the present application.

Fig. 4 is an enlarged view of a coupling oil passage of a hydraulic control system according to an embodiment of the present application.

Fig. 5 is an enlarged view of a hydraulic control system at a first branch, a second branch, according to another embodiment of the present application.

Reference numerals illustrate:

100. a first main oil passage; 110. a first branch; 120. a second branch; 130. an oil treatment device; 131. a press filter; 132. an oil cooler; 140. a bypass oil path; 141. a differential pressure valve; 150. a motor stator cooling branch; 160. a motor rotor cooling branch; 170. a transmission cooling branch;

200. a second main oil passage; 210. a clutch control oil path;

300. a first switching valve; 310. a first housing; 320. a first high pressure region; 330. a first communication bridge; 340. a first low pressure region;

400. a first communication oil path; 410. a first pressure control valve;

500. a coupling oil path;

600. a second switching valve; 610. a second housing; 620. a second high pressure region; 630. a second communication bridge; 640. a second low pressure region;

700. a second communication oil path;

800. controlling an oil path; 810. a second pressure control valve.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 5, an embodiment of the present application provides a hydraulic control system, including a first main oil path 100 and a first switching valve 300; the first main oil passage 100 is used for supplying cooling oil to equipment to be cooled; the first main oil circuit 100 comprises a first branch circuit 110 and a second branch circuit 120 which are arranged in parallel, and the first branch circuit 110 and the second branch circuit 120 are both suitable for being connected with the same equipment to be cooled; the first switching valve 300 is disposed on the second branch 120 and is used for controlling the on-off of the second branch 120.

The hydraulic control system of the embodiment is suitable for a hybrid vehicle, a fuel vehicle or a pure electric vehicle.

The brake, clutch, etc. that need to be cooled may be used as the device to be cooled in this embodiment. The first branch 110 and the second branch 120 are both adapted to be connected to the same device to be cooled, meaning that the first branch 110 and the second branch 120 are both connected to the same clutch or to the same brake, and cool the same clutch or the same brake.

Devices that generate heat during operation, such as clutches, brakes, motor stators, motor rotors, and transmissions, are referred to as to-be-cooled devices; in order to cool the equipment to be cooled, the first main oil line 100 delivers cooling oil to the equipment to be cooled via the first branch line 110.

When the equipment to be cooled is in the working condition with higher cooling capacity requirement, such as the clutch is in a sliding friction state, the second switching valve 600 opens the second branch 120, and the first main oil circuit 100 also conveys cooling oil to the equipment to be cooled through the second branch 120, so that the cooling effect of the equipment to be cooled is improved, and overheating of the equipment to be cooled is avoided.

According to the hydraulic control system of the embodiment, when the cooling demand of the equipment to be cooled is high, the second branch 120 is started to enhance the cooling effect of the equipment to be cooled, so that the effect of avoiding overheating of the equipment to be cooled is achieved.

In order to supply cooling oil to the equipment to be cooled, the first main oil passage 100 is provided with a low-pressure oil pump.

Specifically, in the hydraulic control system of the present embodiment, the number of the first switch valve 300, the first branch 110 and the second branch 120 is multiple and corresponds to one another, and the first branch 110 and the second branch 120 which correspond to one another are connected to the same device to be cooled, so as to cool the same device to be cooled together. The first switch valves 300 on each second branch 120 can independently control the on-off state of the corresponding second branch 120, so that when the cooling of the plurality of devices to be cooled needs to be enhanced, the first switch valves 300 can be independently controlled to be conducted, so that the cooling of the plurality of devices to be cooled is enhanced simultaneously.

In one embodiment, referring to fig. 1 to 5, the first on-off valve 300 is a spool valve, and specifically, the first on-off valve 300 includes a first housing 310, a first communication bridge 330, a first control end, a first oil inlet end, and a first oil outlet end; the first casing 310 has a first sliding cavity, the first communication bridge 330 is slidably disposed in the first sliding cavity and divides the first sliding cavity into a first high pressure area 320 and a first low pressure area 340 isolated from each other, the first control end is disposed on the first casing 310 and communicates with the first high pressure area 320, the first oil inlet end is disposed on the first casing 310 and communicates with the inlet of the second branch 120, and the first oil outlet end is disposed on the first casing 310 and communicates with the outlet of the second branch 120; the first communication bridge 330 is capable of sliding to a first position under the pressure difference between the first high pressure area 320 and the first low pressure area 340, so that the first oil inlet end and the first oil outlet end are communicated through the first communication bridge 330.

When the clutch needs to be switched from the disengaged state to the engaged state, the second main oil passage 200 supplies high-pressure hydraulic oil to the clutch so that the clutch can be switched and maintained in the engaged state; when the clutch needs to be switched from the engaged state to the disengaged state, the second main oil passage 200 is disconnected from the clutch, and high-pressure hydraulic oil is no longer supplied to the clutch. Specifically, the second main oil path 200 is connected to a corresponding clutch through a clutch control oil path 210, and a corresponding pressure control valve and an accumulator are disposed on the clutch control oil path 210, and the accumulator can absorb pressure impact and pulsation, so that the pressure is more stable.

In order to supply hydraulic oil to the clutch, a high-pressure oil pump is provided in the second main oil passage 200. The low-pressure oil pump on the first main oil path 100 may be a low-pressure mechanical pump or a low-pressure electronic pump, and the high-pressure oil pump on the second main oil path 200 may be a high-pressure mechanical pump or a high-pressure electronic pump, which may be specifically selected according to practical situations. The first main oil passage 100 and the second main oil passage 200 are both communicated with the oil reservoir, and the high-pressure oil pump and the low-pressure oil pump both pump the oil stored in the oil reservoir as the cooling oil of the first main oil passage 100 or the driving oil of the second main oil passage 200. The cooling oil and the driving oil can flow back into the oil reservoir.

In this embodiment, when the second branch 120 needs to be opened to enhance the cooling effect of the device to be cooled, high-pressure oil enters the first control end and enters the first high-pressure area 320 through the first control end, so that a pressure difference is formed between the first high-pressure area 320 and the first low-pressure area 340, and the first communication bridge 330 is pushed to slide to the first position, so that the first oil inlet end and the first oil outlet end are communicated, the second branch 120 is conducted, and the cooling effect of the device to be cooled is enhanced.

When the second branch 120 does not need to be opened, that is, the cooling effect of the equipment to be cooled does not need to be enhanced, the high-pressure oil is removed, so that the pressure difference between the first high-pressure area 320 and the first low-pressure area 340 is insufficient to keep the first communication bridge 330 at the first position, the first oil inlet end and the first oil outlet end are disconnected, the first communication bridge 330 cannot be used for communicating, and the second branch 120 is disconnected.

In this embodiment, a spool valve is used as the first switching valve 300, and the second branch 120 is turned on and off, so that the opening and closing control of the spool valve is simple and stable.

Wherein, the high-pressure oil can be input to the first control end by additionally adding an external pressure source; an oil pump is connected to the first control terminal, if necessary, to supply pressurized oil to the first high-pressure region 320.

In other embodiments, the first switching valve 300 further includes a first closed end disposed on the first housing 310, and the first communication bridge 330 is further capable of sliding to a closed position under the pressure difference between the first high pressure region 320 and the first low pressure region 340, such that the first oil inlet end communicates with the first closed end through the first communication bridge 330, and at this time, the first switching valve 300 is closed and the first communication oil path 400 is disconnected.

In one embodiment, referring to fig. 1 to 5, the hydraulic control system further includes a second main oil passage 200, a first communication oil passage 400, and a first pressure control valve 410; the second main oil passage 200 is used for supplying hydraulic oil for driving the clutch to switch between an engaged state and a disengaged state to the clutch; the first control end is connected to the second main oil passage 200 through a first communication oil passage 400, and a first pressure control valve 410 is provided on the first communication oil passage 400 and is used to control the pressure of the first communication oil passage 400.

In this embodiment, the high-pressure oil for driving the clutch to engage in the second main oil path 200 is directly introduced to the first control end, and no external pressure source is required to be additionally arranged, so that the overall structure of the hydraulic control system is simpler; meanwhile, in order to enable the hydraulic oil derived from the second main oil passage 200 to smoothly drive the movement of the first communication bridge 330, the first pressure control valve 410 is provided to regulate the pressure in the first communication oil passage 400, avoiding that the opening and closing of the first switching valve 300 due to pressure mismatch cannot be smoothly controlled.

The first pressure control valve 410 may be a proportional solenoid valve, or the first pressure control valve 410 may be an on-off solenoid valve, and only controls on-off of the first communication oil path 400. Since the pressure change occurs in the on/off of the first communication oil passage 400, the on/off solenoid valve is used as the first pressure control valve 410 to control the pressure of the first communication oil passage 400.

Specifically, when the first main oil passage 100 needs to cool the plurality of clutches, the number of the first branch passage 110, the second branch passage 120, and the first communication oil passage 400 is plural, respectively; in one embodiment, as shown in fig. 2, the plurality of first communication oil passages 400 are connected to the second main oil passage 200 after being merged; in another embodiment, as shown in fig. 5, a plurality of first communication oil passages 400 are respectively connected to the second main oil passage 200.

When the second branch 120 is connected, the cooling oil flows from the first branch 110 and the second branch 120 to the same equipment to be cooled, and at this time, there may be a problem that the cooling oil amount is insufficient, so that the cooling effect on the equipment to be cooled cannot be enhanced. To solve this problem, in one embodiment, referring to fig. 1 to 5, the hydraulic control system further includes a second main oil passage 200 and a coupling oil passage 500; the second main oil passage 200 is used for supplying hydraulic oil for driving the clutch to switch between an engaged state and a disengaged state to the clutch, an inlet of the coupling oil passage 500 is connected to the second main oil passage 200, and an outlet of the coupling oil passage 500 is connected to the first main oil passage 100.

Based on this embodiment, the second main oil passage 200 can supplement the cooling oil to the first main oil passage 100 through the coupling oil passage 500, avoiding the problem of insufficient cooling oil amount of the first main oil passage 100, ensuring that the cooling effect of the equipment to be cooled can be enhanced.

In other embodiments, an oil path may be added between the oil reservoir and the second branch 120, or between the oil reservoir and the first main oil path 100 to supplement the cooling oil of the first main oil path 100.

In one embodiment, referring to fig. 1 to 5, the hydraulic control system further includes a second switching valve 600, where the second switching valve 600 is disposed on the coupling oil path 500 and is used to control on/off of the coupling oil path 500. Based on this embodiment, the second switching valve 600 is provided to open the coupling oil passage 500 when the first main oil passage 100 needs to be replenished with cooling oil, and to disconnect the coupling oil passage 500 when the first main oil passage 100 does not need to be replenished with cooling oil.

In other embodiments, a flow valve may be disposed on the coupling oil path 500 to regulate the flow rate of the coupling oil path 500, so as to achieve the above effect, but the control of the flow valve is more complicated. The flow valve may be a proportional solenoid valve.

In one embodiment, referring to fig. 1 to 5, the second switching valve 600 is a spool valve, and specifically, the second switching valve 600 includes a second housing 610, a second communication bridge 630, a second control end, a second oil inlet end, and a second oil outlet end; the second casing 610 has a second sliding cavity, the second communication bridge 630 is slidably disposed in the second sliding cavity and divides the second sliding cavity into a second high pressure area 620 and a second low pressure area 640 isolated from each other, the second control end is disposed on the second casing 610 and communicates with the second high pressure area 620, the second oil inlet end is disposed on the second casing 610 and communicates with the inlet of the coupling oil path 500, and the second oil outlet end is disposed on the second casing 610 and communicates with the outlet of the coupling oil path 500; the second communication bridge 630 is capable of sliding to a second position under the pressure difference between the second high pressure region 620 and the second low pressure region 640 such that the second oil inlet end and the second oil outlet end communicate through the second communication bridge 630.

In this embodiment, when the coupling oil path 500 needs to be opened to supplement the cooling oil to the first main oil path 100, the high-pressure oil enters the second control end and enters the second high-pressure area 620 through the second control end, so that a pressure difference is formed between the second high-pressure area 620 and the second low-pressure area 640, the second communication bridge 630 is pushed to slide to the second position, so that the second oil inlet end and the second oil outlet end are communicated, the coupling oil path 500 is conducted, and the cooling oil is supplemented to the first main oil path 100.

In one embodiment, referring to fig. 1 to 5, the hydraulic control system further includes a second communication oil path 700, and the second control end is connected to the second main oil path 200 through the second communication oil path 700, so as to control the on/off of the coupling oil path 500 by using the high pressure hydraulic oil in the second main oil path 200.

The present embodiment can combine the related embodiment of the first switching valve 300 being a spool valve, so that the second main oil path 200 has two functions of controlling whether the second branch path 120 is opened or not and supplementing the cooling oil to the first main oil path 100, thereby fully utilizing the high-pressure driving oil in the second main oil path 200 and simplifying the hydraulic control system.

In one embodiment, referring to fig. 1 to 5, the second switching valve 600 further includes a low pressure end disposed on the second housing 610 and communicating with the second low pressure region 640; the hydraulic control system further includes a control oil passage 800 and a second pressure control valve 810; the low pressure side is connected to the second main oil passage 200 through a control oil passage 800, and a second pressure control valve 810 is controlled on the control oil passage 800 and is used to control the pressure of the control oil passage 800.

The on-off of the coupling oil circuit 500 needs to consider whether the first main oil circuit 100 has insufficient cooling oil, so in this embodiment, a low-pressure end communicated with the second low-pressure area 640 is additionally arranged on the second switch valve 600, meanwhile, a control oil circuit 800 is additionally arranged in the hydraulic control system, the low-pressure end is communicated with the second main oil circuit 200 through the control oil circuit 800, and a second pressure control valve 810 is arranged on the low-pressure end; thus, the pressure in the second low pressure region 640 can be adjusted by the second pressure control valve 810, specifically, the second pressure control valve 810 adjusts the pressure in the second low pressure region 640 according to whether the cooling oil is required to be replenished in the first main oil passage 100, thereby changing the pressure difference between the second high pressure region 620 and the second low pressure region 640, and further changing the condition of opening the coupling oil passage 500, so as to replenish the cooling oil into the first main oil passage 100 according to the actual situation.

In one embodiment, referring to fig. 1 to 5, the second switching valve 600 further includes a pressure release end, where the pressure release end is disposed on the second housing 610; the second communication bridge 630 is also capable of sliding to a third position under the pressure differential between the second high pressure region 620 and the second low pressure region 640 such that the second oil inlet end communicates with the pressure relief end through the second communication bridge 630.

In this embodiment, the pressure relief end is a port for discharging load, which is communicated to the outside.

In this embodiment, a pressure relief end is further disposed on the second switch valve 600, and when the pressure of the second main oil circuit 200 is too high, the load is relieved through the pressure relief end, so as to protect the second main oil circuit 200.

In other embodiments, the second switching valve 600 further includes a second closed end disposed on the second housing 610, and the second communication bridge 630 is further capable of sliding to a closed position under the pressure difference between the second high pressure region 620 and the second low pressure region 640, so that the second oil inlet end communicates with the second closed end through the second communication bridge 630, and at this time, the second switching valve 600 is closed and the coupling oil path 500 is disconnected.

In other embodiments, referring to fig. 1 to 5, the hydraulic control system further includes a relief valve disposed on the second communication oil path 700 to avoid the excessive pressure in the second main oil path 200.

In one embodiment, referring to fig. 1 to 5, the hydraulic control system further includes an oil treatment device 130, a bypass oil path 140, and a differential pressure valve 141, wherein the oil treatment device 130 is installed on the first main oil path 100, a differential pressure is formed between an upstream of the oil treatment device 130 and a downstream of the oil treatment device 130, an inlet of the bypass oil path 140 is connected to the upstream of the oil treatment device 130, an outlet of the bypass oil path 140 is connected to the downstream of the oil treatment device 130, and the differential pressure valve 141 is disposed on the bypass oil path 140 to control on-off of the bypass oil path 140.

In this embodiment, after the cooling oil passes through the oil treatment device 130, the pressure will drop, and there is a risk that the pressure in the first main oil passage 100 will be insufficient to supply cooling oil to the equipment to be cooled. For this reason, in the present embodiment, the bypass oil path 140 is provided, so that a part of cooling oil can be directly supplied to the equipment to be cooled without passing through the oil treatment device 130, so that the pressure in the first main oil path 100 is ensured to be sufficient to provide cooling oil to the equipment to be cooled, and further, the cooling requirement of the equipment to be cooled is ensured to be satisfied. The pressure difference valve 141 is adopted, so that the on-off of the bypass oil path 140 can be automatically controlled, additional control is not needed, and the operation is convenient and effective.

In one embodiment, referring to fig. 1-5, the oil treatment device 130 includes a filter press 131 and/or an oil cooler 132, and the cooling oil is blocked from flowing through the filter press 131 or the oil cooler 132 and is reduced in pressure. In other embodiments, the oil treatment device 130 may include any device that causes a drop in the pressure of the cooling oil.

In one embodiment, referring to fig. 1-5, the first main oil circuit 100 further includes a motor stator cooling branch 150, a motor rotor cooling branch 160, and a transmission cooling branch 170; the motor stator cooling branch 150, the motor rotor cooling branch 160, and the transmission cooling branch 170 are disposed in parallel. The first main oil passage 100 supplies cooling oil to the motor stator, the motor rotor, and the transmission through the motor stator cooling branch 150, the motor rotor cooling branch 160, the transmission cooling branch 170, and the like, respectively, to cool them. The embodiment of the utility model can also be used for cooling among a plurality of equipment to be cooled, thereby effectively reducing the work numbers of two pumps; in this case, the plurality of devices to be cooled are connected in parallel to one another, but in other embodiments, the plurality of devices to be cooled may also be arranged in a stacked, serial fashion.

In one embodiment, an accumulator or a relief valve may be selectively provided on each oil passage to open the relief valve for relief of pressure when the pressure in the oil passage is too high, while smoothing pressure fluctuations in the oil passage using the accumulator. In one embodiment, the first main oil path 100 is provided with a check valve, which is a differential pressure type one-way slide valve, so that when the pressure difference is formed at two ends of the check valve after the first main oil path 100 starts to operate, the first main oil path 100 is opened again to protect the first main oil path 100.

The embodiment of the application also provides a vehicle comprising the hydraulic control system.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the utility model is defined by the appended claims.

Claims (12)

1. A hydraulic control system, comprising:

the first main oil way is used for providing cooling oil for equipment to be cooled; the first main oil way comprises a first branch and a second branch which are arranged in parallel, and the first branch and the second branch are both suitable for being connected with the same equipment to be cooled; and

the first switch valve is arranged on the second branch and used for controlling the on-off of the second branch;

the first switch valves, the first branch circuits and the second branch circuits are multiple in number and correspond to each other one by one, and the first switch valves can independently control the on-off of the corresponding second branch circuits;

the hydraulic control system further comprises an oil treatment device, a bypass oil way and a differential pressure valve, wherein the oil treatment device is arranged on the first main oil way, a differential pressure is formed between the upstream of the oil treatment device and the downstream of the oil treatment device, an inlet of the bypass oil way is connected with the upstream of the oil treatment device, an outlet of the bypass oil way is connected with the downstream of the oil treatment device, and the differential pressure valve is arranged on the bypass oil way to control the on-off of the bypass oil way.

2. The hydraulic control system of claim 1, wherein,

the first switching valve is a spool valve, and the first switching valve includes:

a first housing having a first sliding chamber;

the first communication bridge is arranged in the first sliding cavity in a sliding way and divides the first sliding cavity into a first high-pressure area and a first low-pressure area which are isolated from each other;

the first control end is arranged on the first shell and communicated with the first high-pressure area;

the first oil inlet end is arranged on the first shell and is communicated with the inlet of the second branch; and

the first oil outlet end is arranged on the first shell and is communicated with the outlet of the second branch;

the first communication bridge can slide to a first position under the action of pressure difference between the first high-pressure area and the first low-pressure area, so that the first oil inlet end and the first oil outlet end are communicated through the first communication bridge.

3. The hydraulic control system of claim 2, further comprising:

a second main oil passage for supplying hydraulic oil for driving the clutch to switch between an engaged state and a disengaged state to the clutch;

the first control end is connected with the second main oil way through the first communication oil way; and

the first pressure control valve is arranged on the first communication oil path and used for controlling the pressure of the first communication oil path.

4. The hydraulic control system of claim 1, further comprising a second main oil passage and a coupling oil passage; the second main oil way is used for providing hydraulic oil for the clutch, wherein the hydraulic oil is used for driving the clutch to switch between an engaged state and a disengaged state, the inlet of the coupling oil way is connected with the second main oil way, and the outlet of the coupling oil way is connected with the first main oil way.

5. The hydraulic control system according to claim 4, further comprising a second switching valve provided on the coupling oil passage and configured to control on-off of the coupling oil passage.

6. The hydraulic control system of claim 5, wherein the second on-off valve is a spool valve, the second on-off valve comprising:

a second housing having a second sliding chamber;

the second communication bridge is arranged in the second sliding cavity in a sliding way and divides the second sliding cavity into a second high-pressure area and a second low-pressure area which are isolated from each other;

the second control end is arranged on the second shell and communicated with the second high-pressure area;

the second oil inlet end is arranged on the second shell and is communicated with the inlet of the coupling oil way; and

the second oil outlet end is arranged on the second shell and is communicated with the outlet of the coupling oil way;

the second communication bridge can slide to a second position under the action of pressure difference between the second high-pressure area and the second low-pressure area, so that the second oil inlet end and the second oil outlet end are communicated through the second communication bridge.

7. The hydraulic control system of claim 6, further comprising:

the second control end is connected with the second main oil way through the second communication oil way.

8. The hydraulic control system of claim 6, wherein the second switching valve further comprises a low pressure end disposed on the second housing and in communication with the second low pressure region;

the hydraulic control system further includes:

the low-pressure end is connected with the second main oil way through the control oil way; and

and the second pressure control valve is controlled on the control oil path and used for controlling the pressure of the control oil path.

9. The hydraulic control system of claim 6, wherein the second switching valve further comprises a relief end disposed on the second housing;

the second communication bridge can also slide to a third position under the action of a pressure difference between a second high-pressure area and a second low-pressure area, so that the second oil inlet end and the pressure relief end are communicated through the second communication bridge.

10. The hydraulic control system of claim 9, wherein the oil treatment device comprises a filter press and/or an oil cooler.

11. The hydraulic control system of any one of claims 1-9, wherein the first main oil circuit further includes a motor stator cooling branch, a motor rotor cooling branch, and a transmission cooling branch;

the motor stator cooling branch, the motor rotor cooling branch and the transmission cooling branch are arranged in parallel.

12. A vehicle comprising a hydraulic control system according to any one of claims 1 to 11.