Vehicle hydraulic system

Abstract

The present disclosure relates to the technical field of hydraulic systems, and more particularly to a vehicle hydraulic system. In this system, a first oil inlet of a clutch oil supply control valve is connected to a main oil circuit, and a first control port of the clutch oil supply control valve is connected to a first shuttle valve oil outlet of a first shuttle valve. The clutch oil supply control valve is connected to a third shuttle valve oil inlet of a first clutch cylinder and a second shuttle valve via a clutch brake control valve, allowing hydraulic oil to enter the first clutch cylinder and the second shuttle valve through the clutch brake control valve. The clutch oil supply control valve is connected to a fourth shuttle valve oil inlet of a second clutch cylinder and the second shuttle valve via a clutch brake control valve, allowing hydraulic oil to enter the second clutch cylinder and the second shuttle valve through the clutch brake control valve. The second shuttle valve oil outlet of the second shuttle valve is connected to the second shuttle valve oil inlet of the first shuttle valve. This disclosure aims to prevent vehicle stall failures caused by damage to a pilot solenoid valve connected to the clutch oil supply control valve.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a vehicle hydraulic system. Background Art

[0002] If the pilot solenoid valve connected to the clutch oil supply control valve fails while the vehicle is in drive, it will enter a closed state. This will cause the oil pressure in the pilot oil circuit to decrease or even disappear. The oil pressure in the parking control valve connected to the clutch oil supply control valve will also decrease or even disappear, causing the parking valve to enter a stopped state, resulting in an abrupt stop. Sudden stops can be dangerous. Therefore, it is imperative to prevent premature stops caused by pilot solenoid valve failures. Summary of the Invention

[0003] The present invention provides a vehicle hydraulic system, the purpose of which is to prevent the occurrence of a parking fault caused by damage to a pilot solenoid valve connected to a clutch oil supply control valve.

[0004] The above-mentioned vehicle hydraulic system includes a clutch oil supply control valve, a first clutch oil cylinder, a second clutch oil cylinder, a third clutch oil cylinder, a first brake oil cylinder and a second brake oil cylinder; the first oil inlet of the clutch oil supply control valve is connected to the main oil circuit, the first control port of the clutch oil supply control valve is connected to the first shuttle valve oil outlet of the first shuttle valve, and the first shuttle valve oil inlet of the first shuttle valve is connected to a pilot solenoid valve; the first shuttle valve oil outlet is connected to the second control port of the parking control valve, the second oil inlet of the parking control valve is connected to the main oil circuit, and the second oil outlet of the parking control valve is connected to the parking valve oil inlet of the parking valve; the clutch oil supply control valve is connected to the first clutch oil cylinder and the second shuttle valve through a clutch brake control valve The oil inlet of the third shuttle valve is connected so that the hydraulic oil can enter the first clutch cylinder and the second shuttle valve through the clutch brake control valve; the clutch oil supply control valve is connected with the second clutch cylinder and the fourth shuttle valve oil inlet of the second shuttle valve through a clutch brake control valve, so that the hydraulic oil can enter the second clutch cylinder and the second shuttle valve through the clutch brake control valve; the second shuttle valve oil outlet of the second shuttle valve is connected with the second shuttle valve oil inlet of the first shuttle valve; the clutch oil supply control valve is connected with the third clutch cylinder through a clutch brake control valve; the first brake cylinder and the second brake cylinder are connected with the main oil circuit through a clutch brake control valve respectively; each clutch brake control valve is connected with a pilot solenoid valve.

[0005] Optionally, the clutch oil supply control valve is connected to the first clutch cylinder through the first clutch brake control valve; the first oil outlet of the clutch oil supply control valve is connected to the third oil inlet of the first clutch brake control valve, the third oil outlet of the first clutch brake control valve is connected to the first clutch cylinder and the third shuttle valve oil inlet of the second shuttle valve, and the third oil outlet of the first clutch brake control valve is connected to the fourth oil inlet of the first clutch brake control valve, and the fourth oil outlet of the first clutch brake control valve is connected to the first feedback oil inlet of the first clutch brake control valve; the first pilot oil inlet and the second pilot oil inlet of the first clutch oil supply control valve are both connected to the second pilot solenoid valve.

[0006] Optionally, the first clutch brake control valve is connected to the first clutch cylinder through two oil circuits, one of which is provided with a one-way valve.

[0007] Optionally, the clutch oil supply control valve is connected to the second clutch cylinder through the second clutch brake control valve; the first oil outlet of the clutch oil supply control valve is connected to the fifth oil inlet of the second clutch brake control valve, the fifth oil outlet of the second clutch brake control valve is connected to the second clutch cylinder and the fourth shuttle valve oil inlet of the second shuttle valve, and the fifth oil outlet of the second clutch brake control valve is connected to the sixth oil inlet of the second clutch brake control valve, and the sixth oil outlet of the second clutch brake control valve is connected to the second feedback oil inlet of the second clutch brake control valve; the third pilot oil inlet and the fourth pilot oil inlet of the second clutch oil supply control valve are both connected to the third pilot solenoid valve.

[0008] Optionally, the second clutch brake control valve is connected to the second clutch cylinder through two oil circuits, one of which is provided with a one-way valve.

[0009] Optionally, the clutch oil supply control valve is connected to the third clutch cylinder through the third clutch brake control valve; the first oil outlet of the clutch oil supply control valve is connected to the seventh oil inlet of the third clutch brake control valve, the seventh oil outlet of the third clutch brake control valve is connected to the third clutch cylinder, and the seventh oil outlet of the third clutch brake control valve is connected to the eighth oil inlet of the third clutch brake control valve, and the eighth oil outlet of the third clutch brake control valve is connected to the third feedback oil inlet of the third clutch brake control valve; the fifth pilot oil inlet and the sixth pilot oil inlet of the third clutch oil supply control valve are both connected to the fourth pilot solenoid valve.

[0010] Optionally, the main oil circuit is connected to the first brake cylinder through the fourth clutch brake control valve; the main oil circuit is connected to the ninth oil inlet of the fourth clutch brake control valve, the ninth oil outlet of the fourth clutch brake control valve is connected to the first brake cylinder, and the ninth oil outlet of the fourth clutch brake control valve is connected to the tenth oil inlet of the fourth clutch brake control valve, and the tenth oil outlet of the fourth clutch brake control valve is connected to the fourth feedback oil inlet of the fourth clutch brake control valve; the seventh pilot oil inlet and the eighth pilot oil inlet of the fourth clutch oil supply control valve are both connected to the fifth pilot solenoid valve.

[0011] Optionally, the main oil circuit is connected to the second brake cylinder through the fifth clutch brake control valve; the main oil circuit is connected to the eleventh oil inlet of the fifth clutch brake control valve, the eleventh oil outlet of the fifth clutch brake control valve is connected to the second brake cylinder, and the eleventh oil outlet of the fifth clutch brake control valve is connected to the twelfth oil inlet of the fifth clutch brake control valve, and the twelfth oil outlet of the fifth clutch brake control valve is connected to the fifth feedback oil inlet of the fifth clutch brake control valve; the ninth pilot oil inlet and the tenth pilot oil inlet of the fifth clutch oil supply control valve are both connected to the sixth pilot solenoid valve.

[0012] Optionally, the second shuttle valve oil outlet of the second shuttle valve is connected to the pressure relief oil inlet of the clutch oil supply control valve.

[0013] The technical solution provided by the embodiment of the present invention has the following advantages compared with the existing technology:

[0014] Even if the pilot solenoid valve connected to the clutch oil supply control valve is damaged during vehicle driving, the hydraulic oil in the main oil circuit can still flow to the first control port and the second control port through the clutch oil supply control valve, the clutch brake control valve, the second shuttle valve and the first shuttle valve, which ensures that the hydraulic oil in the main oil circuit can enter the parking valve oil inlet of the parking valve through the parking control valve, so that the parking valve will not stop; it can also ensure that the hydraulic oil in the main oil circuit continues to apply pressure to the first clutch cylinder and the second clutch cylinder, thereby ensuring that the vehicle will not stop due to a sudden pressure stop in the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1A schematic diagram of a vehicle hydraulic system during parking according to an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a vehicle hydraulic system during release from parking according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a vehicle hydraulic system in an embodiment of the present invention when the first pilot solenoid valve is damaged;

[0020] Figure 4 A schematic diagram of a clutch brake control valve according to an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of an oil supply control valve according to an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of a parking control valve according to an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of a parking valve in one embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] like Figures 1 to 7As shown, the vehicle hydraulic system of the present invention includes a clutch oil supply control valve 10, a first clutch cylinder 68, a second clutch cylinder 78, a third clutch cylinder 88, a first brake cylinder 98, and a second brake cylinder 108. A first oil inlet 11 of the clutch oil supply control valve 10 is connected to a main oil circuit, a first control port 13 of the clutch oil supply control valve 10 is connected to a first shuttle valve oil outlet 43 of a first shuttle valve 40, and a first shuttle valve oil inlet 41 of the first shuttle valve 40 is connected to a pilot solenoid valve. The first shuttle valve oil outlet 43 communicates with the second control port 23 of the parking control valve 20. The second oil inlet 21 of the parking control valve 20 communicates with the main oil circuit. The second oil outlet 22 of the parking control valve 20 communicates with the parking valve oil inlet 31 of the parking valve 30. The clutch oil supply control valve 10 communicates with the first clutch cylinder 68 and the third shuttle valve oil inlet 51 of the second shuttle valve 50 through a clutch brake control valve, allowing hydraulic oil to enter the first clutch cylinder 68 and the second shuttle valve 50 through the clutch brake control valve. The clutch oil supply control valve 10 communicates with the second clutch cylinder 78 and the fourth shuttle valve oil inlet 52 of the second shuttle valve 50 through a clutch brake control valve, allowing hydraulic oil to enter the second clutch cylinder 78 and the second shuttle valve 50 through the clutch brake control valve. The second shuttle valve oil outlet 53 of the second shuttle valve 50 communicates with the second shuttle valve oil inlet 42 of the first shuttle valve 40. The clutch oil supply control valve 10 communicates with the third clutch cylinder 88 through a clutch brake control valve. The first brake cylinder 98 and the second brake cylinder 108 are respectively connected to the main oil circuit through a clutch brake control valve. Each clutch brake control valve is connected to a pilot solenoid valve.

[0027] In this embodiment, when the hydraulic system is operating normally, the pilot solenoid valve (i.e., the first pilot solenoid valve 14) connected to the clutch oil supply control valve 10 is open, and hydraulic oil flows sequentially through the first shuttle valve inlet 41 and the first shuttle valve outlet 43, and simultaneously flows to the first control port 13 and the second control port 23, thereby pushing the valve cores of the clutch oil supply control valve 10 and the parking control valve 20 to open. This allows hydraulic oil from the main oil circuit to flow through the second oil inlet 21 and the second oil outlet 22 to the parking valve inlet 31 of the parking valve 30, thereby pushing the valve core of the parking valve 30. Furthermore, when the pilot solenoid valve connected to the first clutch cylinder 68 is opened, the clutch brake control valve connected to the first clutch cylinder 68 is actuated, and hydraulic oil from the main oil circuit can enter the first clutch cylinder 68 and the second shuttle valve 50 through the first oil inlet 11, the second oil inlet 21, and the clutch brake control valve (the inlet and outlet). The hydraulic oil entering the second shuttle valve 50 flows through the second shuttle valve inlet 42 and the first shuttle valve outlet 43 to the first control port 13 and the second control port 23. Similarly, when the pilot solenoid valve connected to the second clutch cylinder 78 opens, the clutch brake control valve connected to the second clutch cylinder 78 is activated, and the hydraulic oil in the main oil circuit can flow through the first oil inlet 11, the second oil inlet 21, and the clutch brake control valve (the inlet and outlet) into the second clutch cylinder 78 and the second shuttle valve 50. The hydraulic oil entering the second shuttle valve 50 flows through the second shuttle valve inlet 42 and the first shuttle valve outlet 43 to the first control port 13 and the second control port 23. Therefore, even if the pilot solenoid valve (i.e., the first pilot solenoid valve 14) connected to the clutch oil supply control valve 10 is damaged during vehicle driving, the hydraulic oil in the main oil circuit can still flow to the first control port 13 and the second control port 23 through the clutch oil supply control valve 10, the clutch brake control valve, the second shuttle valve 50 and the first shuttle valve 40, thereby ensuring that the hydraulic oil in the main oil circuit can enter the parking valve oil inlet 31 of the parking valve 30 through the parking control valve 20, so that the parking valve 30 will not stop; it can also ensure that the hydraulic oil in the main oil circuit continues to apply pressure to the first clutch cylinder 68 and the second clutch cylinder 78, thereby ensuring that the vehicle will not stop due to a sudden pressure stop in the hydraulic system.

[0028] It should be noted that the hydraulic valves (such as clutch brake control valves), oil cylinders, solenoid valves, etc. mentioned in the above embodiments can all be common devices in the field, and the present invention will not elaborate on their structures and principles.

[0029] like Figure 1 and Figure 4As shown, in one embodiment of the present invention, the clutch oil supply control valve 10 is connected to the first clutch cylinder 68 through the first clutch brake control valve 60; the first oil outlet 12 of the clutch oil supply control valve 10 is connected to the third oil inlet 61 of the first clutch brake control valve 60, the third oil outlet 62 of the first clutch brake control valve 60 is connected to the first clutch cylinder 68 and the third shuttle valve oil inlet 51 of the second shuttle valve 50, and the third oil outlet 62 of the first clutch brake control valve 60 is connected to the fourth oil inlet 63 of the first clutch brake control valve 60, and the fourth oil outlet 64 of the first clutch brake control valve 60 is connected to the first feedback oil inlet 67 of the first clutch brake control valve 60; the first pilot oil inlet 65 and the second pilot oil inlet 66 of the first clutch oil supply control valve 10 are both connected to the second pilot solenoid valve 69.

[0030] In this embodiment, when the hydraulic oil pressure from the pilot oil circuit is between 0 and 4 bar (excluding the minimum limit), the pilot oil can enter through the first pilot oil inlet 65 and push the valve core there, thereby connecting the third oil inlet 61 and the third oil outlet 62, thereby allowing the hydraulic oil from the main oil circuit to enter the second shuttle valve 50 and the first clutch cylinder 68. Simultaneously, the hydraulic oil flowing from the third oil outlet 62 also enters the first feedback oil inlet 67 through the fourth oil inlet 63 and the fourth oil outlet 64 to regulate the oil pressure in the first clutch cylinder 68. Furthermore, when the hydraulic oil pressure from the pilot oil circuit is between 4 and 5 bar (excluding the minimum limit), the pilot oil can also enter through the first pilot oil inlet 65 and push the valve core there, closing the fourth oil inlet 63 and thus equalizing the oil pressure in the main oil circuit with the oil pressure in the first clutch cylinder 68.

[0031] like Figures 1 to 3 As shown, in one embodiment of the present invention, the first clutch brake control valve 60 is connected to the first clutch cylinder 68 via two oil circuits, one of which is provided with a one-way valve. In this way, rapid oil filling and full-speed oil draining are achieved.

[0032] like Figure 1 and Figure 4As shown, in one embodiment of the present invention, the clutch oil supply control valve 10 is connected to the second clutch cylinder 78 through the second clutch brake control valve 70; the first oil outlet 12 of the clutch oil supply control valve 10 is connected to the fifth oil inlet 71 of the second clutch brake control valve 70, the fifth oil outlet 72 of the second clutch brake control valve 70 is connected to the second clutch cylinder 78 and the fourth shuttle valve oil inlet 52 of the second shuttle valve 50, and the fifth oil outlet 72 of the second clutch brake control valve 70 is connected to the sixth oil inlet 73 of the second clutch brake control valve 70, and the sixth oil outlet 74 of the second clutch brake control valve 70 is connected to the second feedback oil inlet 77 of the second clutch brake control valve 70; the third pilot oil inlet 75 and the fourth pilot oil inlet 76 of the second clutch oil supply control valve 10 are both connected to the third pilot solenoid valve 79.

[0033] In this embodiment, the functional process of the second clutch oil supply control valve 10 can refer to the functional process of the first clutch oil supply control valve 10, which will not be repeated in this embodiment.

[0034] like Figures 1 to 3 As shown, in one embodiment of the present invention, the second clutch brake control valve 70 is connected to the second clutch oil cylinder 78 through two oil circuits, one of which is provided with a one-way valve. In this way, rapid oil filling and full-speed oil draining are achieved.

[0035] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, the clutch oil supply control valve 10 is connected to the third clutch cylinder 88 through the third clutch brake control valve 80; the first oil outlet 12 of the clutch oil supply control valve 10 is connected to the seventh oil inlet 81 of the third clutch brake control valve 80, the seventh oil outlet 82 of the third clutch brake control valve 80 is connected to the third clutch cylinder 88, and the seventh oil outlet 82 of the third clutch brake control valve 80 is connected to the eighth oil inlet 83 of the third clutch brake control valve 80, and the eighth oil outlet 84 of the third clutch brake control valve 80 is connected to the third feedback oil inlet 87 of the third clutch brake control valve 80; the fifth pilot oil inlet 85 and the sixth pilot oil inlet 86 of the third clutch oil supply control valve 10 are both connected to the fourth pilot solenoid valve 89.

[0036] In this embodiment, the functional process of the third clutch oil supply control valve 10 can refer to the functional process of the first clutch oil supply control valve 10, which will not be repeated in this embodiment.

[0037] like Figure 1 and Figure 4As shown, in one embodiment of the present invention, the main oil circuit is connected to the first brake cylinder 98 through the fourth clutch brake control valve 90; the main oil circuit is connected to the ninth oil inlet 91 of the fourth clutch brake control valve 90, the ninth oil outlet 92 of the fourth clutch brake control valve 90 is connected to the first brake cylinder 98, and the ninth oil outlet 92 of the fourth clutch brake control valve 90 is connected to the tenth oil inlet 93 of the fourth clutch brake control valve 90, and the tenth oil outlet 94 of the fourth clutch brake control valve 90 is connected to the fourth feedback oil inlet 97 of the fourth clutch brake control valve 90; the seventh pilot oil inlet 95 and the eighth pilot oil inlet 96 of the fourth clutch oil supply control valve 10 are both connected to the fifth pilot solenoid valve 99.

[0038] In this embodiment, the functional process of the fourth clutch oil supply control valve 10 can refer to the functional process of the first clutch oil supply control valve 10, which will not be repeated in this embodiment.

[0039] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, the main oil circuit is connected to the second brake cylinder 108 through the fifth clutch brake control valve 100; the main oil circuit is connected to the eleventh oil inlet 101 of the fifth clutch brake control valve 100, the eleventh oil outlet 102 of the fifth clutch brake control valve 100 is connected to the second brake cylinder 108, and the eleventh oil outlet 102 of the fifth clutch brake control valve 100 is connected to the twelfth oil inlet 103 of the fifth clutch brake control valve 100, and the twelfth oil outlet 104 of the fifth clutch brake control valve 100 is connected to the fifth feedback oil inlet 107 of the fifth clutch brake control valve 100; the ninth pilot oil inlet 105 and the tenth pilot oil inlet 106 of the fifth clutch oil supply control valve 10 are both connected to the sixth pilot solenoid valve 109.

[0040] In this embodiment, the functional process of the fifth clutch oil supply control valve 10 can refer to the functional process of the first clutch oil supply control valve 10, which will not be repeated in this embodiment.

[0041] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, the second shuttle valve oil outlet 53 of the second shuttle valve 50 is connected to the pressure relief oil inlet 15 of the oil supply control valve. Therefore, the hydraulic oil between the first shuttle valve 40 and the second shuttle valve 50 can be discharged through the pressure relief oil inlet 15 of the oil supply control valve.

[0042] Below in combination with the present invention Figures 1 to 3 , the implementation process of the vehicle hydraulic system is explained.

[0043] When in the parking state, the first to sixth pilot solenoid valves are not open, there is no oil pressure in all pilot oil circuits, the hydraulic oil of the main oil circuit does not enter the clutch oil supply control valve 10, and the parking valve 30 is not started.

[0044] When the parking position is released, the first pilot solenoid valve 14 opens, opening the pilot oil circuit within which it resides. Hydraulic oil flows from this pilot oil circuit into the first shuttle valve 40, and from there into the first control port 13 of the clutch oil supply control valve 10 and the second control port 23 of the parking control valve 20. This hydraulic oil pushes the valve core of the parking control valve 20, connecting the second oil inlet 21 and second oil outlet 22 of the parking control valve 20. This in turn allows hydraulic oil from the main oil circuit to flow through the second oil inlet 21 and second oil outlet 22 into the parking valve inlet 31 of the parking valve 30, pushing the valve core of the parking valve 30. At this point, the parking valve 30 begins to actuate, and the vehicle's parking position is released. In addition, after the hydraulic oil from the pilot oil circuit enters the first control port 13, it will push the valve core of the clutch oil supply control valve 10, so that the first oil inlet 11 and the first oil outlet 12 of the clutch oil supply control valve 10 are connected, and then the hydraulic oil of the main oil circuit flows from the first oil inlet 11 and the first oil outlet 12 to the first clutch brake control valve 60, the second clutch brake control valve 70 and the third clutch brake control valve 80.

[0045] When the vehicle is traveling in first gear, the first brake cylinder 98, the second brake cylinder 108, and the first clutch cylinder 68 are activated. Specifically, the first pilot solenoid valve 14, the first brake cylinder 98, and the second brake cylinder 108 are activated. Hydraulic oil flows from the pilot oil circuit of the second pilot solenoid valve 69 into the first pilot oil inlet 65, pushing the valve core there, connecting the third oil inlet 61 and the third oil outlet 62. This allows hydraulic oil from the clutch oil supply control valve 10 to flow through the third oil inlet 61 and the third oil outlet 62 into the first clutch cylinder 68 and the second shuttle valve 50, activating the first clutch cylinder 68. Simultaneously, the hydraulic oil flowing into the second shuttle valve 50 flows through the first shuttle valve 40 to the first control port 13 and the second control port 23. In addition, the hydraulic oil of the main oil circuit will enter the first brake cylinder 98 through the fourth clutch brake control valve 90 , and the hydraulic oil of the main oil circuit will enter the second brake cylinder 108 through the fifth clutch brake control valve 100 .

[0046] When the car needs to travel in other gears, this can be achieved by coordinating the various oil cylinders in the table below. The flow direction of the hydraulic oil will not be described in detail in this embodiment.

[0047]

[0048] When the first pilot solenoid valve 14 fails, the pilot oil circuit at the first pilot solenoid valve 14 loses oil pressure. However, hydraulic oil from the second shuttle valve 50 flows through the first shuttle valve 40 to the first control port 13 and the second control port 23. Pressure remains at the valve cores of the parking control valve 20 and the clutch oil supply control valve 10, allowing the parking control valve 20 to remain actuated and the valve core of the parking valve 30 to continue to be pushed by the hydraulic oil from the main oil circuit. Furthermore, the clutch oil supply control valve 10 remains actuated, allowing hydraulic oil from the main oil circuit to flow into the first clutch cylinder 68, the second clutch cylinder 78, and / or the third clutch cylinder 88. Therefore, even if the first pilot solenoid valve 14 fails, the parking control valve 20, the parking valve 30, and the clutch oil supply control valve 10 remain actuated, preventing the parking valve 30 from entering a stopped state and causing an abrupt vehicle stop.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0050] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle hydraulic system, characterized in that: It includes a clutch oil supply control valve (10), a first clutch oil cylinder (68), a second clutch oil cylinder (78), a third clutch oil cylinder (88), a first brake oil cylinder (98) and a second brake oil cylinder (108); The first oil inlet (11) of the clutch oil supply control valve (10) is in communication with the main oil circuit, the first control port 13 of the clutch oil supply control valve (10) is in communication with the first shuttle valve oil outlet (43) of the first shuttle valve (40), and the first shuttle valve oil inlet (41) of the first shuttle valve (40) is in communication with a pilot solenoid valve; The first shuttle valve oil outlet (43) is in communication with the second control port (23) of the parking control valve (20), the second oil inlet (21) of the parking control valve (20) is in communication with the main oil circuit, and the second oil outlet (22) of the parking control valve (20) is in communication with the parking valve oil inlet (31) of the parking valve (30); The clutch oil supply control valve (10) is connected to the first clutch oil cylinder (68) and the third shuttle valve oil inlet (51) of the second shuttle valve (50) through a clutch brake control valve, so that hydraulic oil can enter the first clutch oil cylinder (68) and the second shuttle valve (50) through the clutch brake control valve; the clutch oil supply control valve (10) is connected to the second clutch oil cylinder (78) and the fourth shuttle valve oil inlet (52) of the second shuttle valve (50) through a clutch brake control valve, so that hydraulic oil can enter the second clutch oil cylinder (78) and the second shuttle valve (50) through the clutch brake control valve; the second shuttle valve oil outlet (53) of the second shuttle valve (50) is connected to the second shuttle valve oil inlet (42) of the first shuttle valve (40); the clutch oil supply control valve (10) is connected to the third clutch oil cylinder (88) through a clutch brake control valve; The first brake cylinder (98) and the second brake cylinder (108) are respectively connected to the main oil circuit via a clutch brake control valve; Each of the clutch brake control valves is communicated with a pilot solenoid valve.

2. The vehicle hydraulic system according to claim 1, characterized in that: The clutch oil supply control valve (10) is connected to the first clutch oil cylinder (68) through the first clutch brake control valve (60); the first oil outlet (12) of the clutch oil supply control valve (10) is connected to the third oil inlet (61) of the first clutch brake control valve (60); the third oil outlet (62) of the first clutch brake control valve (60) is connected to the first clutch oil cylinder (68) and the third shuttle valve oil inlet (51) of the second shuttle valve (50); The third oil outlet (62) of the first clutch brake control valve (60) is communicated with the fourth oil inlet (63) of the first clutch brake control valve (60), and the fourth oil outlet (64) of the first clutch brake control valve (60) is communicated with the first feedback oil inlet (67) of the first clutch brake control valve (60); and the first pilot oil inlet (65) and the second pilot oil inlet (66) of the first clutch oil supply control valve (10) are both communicated with the second pilot solenoid valve (69).

3. The vehicle hydraulic system according to claim 2, characterized in that: The first clutch brake control valve (60) is connected to the first clutch oil cylinder (68) through two oil circuits, one of which is provided with a one-way valve.

4. The vehicle hydraulic system according to claim 2, characterized in that: The clutch oil supply control valve (10) is connected to the second clutch oil cylinder (78) through the second clutch brake control valve (70); the first oil outlet (12) of the clutch oil supply control valve (10) is connected to the fifth oil inlet (71) of the second clutch brake control valve (70); the fifth oil outlet (72) of the second clutch brake control valve (70) is connected to the second clutch oil cylinder (78) and the fourth shuttle valve oil inlet (52) of the second shuttle valve (50). The fifth oil outlet (72) of the second clutch brake control valve (70) is communicated with the sixth oil inlet (73) of the second clutch brake control valve (70), and the sixth oil outlet (74) of the second clutch brake control valve (70) is communicated with the second feedback oil inlet (77) of the second clutch brake control valve (70); and the third pilot oil inlet (75) and the fourth pilot oil inlet (76) of the second clutch oil supply control valve (10) are both communicated with the third pilot solenoid valve (79).

5. The vehicle hydraulic system according to claim 4, characterized in that: The second clutch brake control valve (70) is connected to the second clutch oil cylinder (78) through two oil circuits, one of which is provided with a one-way valve.

6. The vehicle hydraulic system according to claim 4, characterized in that: The clutch oil supply control valve (10) is communicated with the third clutch oil cylinder (88) through the third clutch brake control valve (80); the first oil outlet (12) of the clutch oil supply control valve (10) is communicated with the seventh oil inlet (81) of the third clutch brake control valve (80), the seventh oil outlet (82) of the third clutch brake control valve (80) is communicated with the third clutch oil cylinder (88), and the seventh oil outlet (82) of the third clutch brake control valve (80) is communicated with the eighth oil inlet (83) of the third clutch brake control valve (80), and the eighth oil outlet (84) of the third clutch brake control valve (80) is communicated with the third feedback oil inlet (87) of the third clutch brake control valve (80); the fifth pilot oil inlet (85) and the sixth pilot oil inlet (86) of the third clutch oil supply control valve (10) are both communicated with the fourth pilot solenoid valve (89).

7. The vehicle hydraulic system according to claim 1, characterized in that: The main oil circuit is communicated with the first brake cylinder (98) through the fourth clutch brake control valve (90); the main oil circuit is communicated with the ninth oil inlet (91) of the fourth clutch brake control valve (90), the ninth oil outlet (92) of the fourth clutch brake control valve (90) is communicated with the first brake cylinder (98), and the ninth oil outlet (92) of the fourth clutch brake control valve (90) is communicated with the tenth oil inlet (93) of the fourth clutch brake control valve (90), and the tenth oil outlet (94) of the fourth clutch brake control valve (90) is communicated with the fourth feedback oil inlet (97) of the fourth clutch brake control valve (90); the seventh pilot oil inlet (95) and the eighth pilot oil inlet (96) of the fourth clutch oil supply control valve (10) are both communicated with the fifth pilot solenoid valve (99).

8. The vehicle hydraulic system according to claim 7, characterized in that: The main oil circuit is communicated with the second brake cylinder (108) through the fifth clutch brake control valve (100); the main oil circuit is communicated with the eleventh oil inlet (101) of the fifth clutch brake control valve (100), the eleventh oil outlet (102) of the fifth clutch brake control valve (100) is communicated with the second brake cylinder (108), and the eleventh oil outlet (102) of the fifth clutch brake control valve (100) is communicated with the twelfth oil inlet (103) of the fifth clutch brake control valve (100), and the twelfth oil outlet (104) of the fifth clutch brake control valve (100) is communicated with the fifth feedback oil inlet (107) of the fifth clutch brake control valve (100); the ninth pilot oil inlet (105) and the tenth pilot oil inlet (106) of the fifth clutch oil supply control valve (10) are both communicated with the sixth pilot solenoid valve (109).

9. The vehicle hydraulic system according to claim 1, characterized in that: The second shuttle valve oil outlet (53) of the second shuttle valve (50) is communicated with the pressure relief oil inlet (15) of the clutch oil supply control valve (10).

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