Vehicle hydraulic warning system and vehicle hydraulic warning method

Abstract

The present invention discloses a vehicle hydraulic warning system and a vehicle hydraulic warning method, wherein one of the oil inlet of the forward clutch and the oil inlet of the reverse clutch can be connected to the first inlet, one of the oil inlet of the first gear clutch, the oil inlet of the second gear clutch and the oil inlet of the third gear clutch can be connected to the second inlet, a first pressure sensor is provided at the first outlet, and a second pressure sensor is provided at the oil inlet of the first gear clutch; one of the oil inlet of the left turning clutch and the oil inlet of the left brake clutch can be connected to the third inlet, one of the oil inlet of the right turning clutch and the oil inlet of the right brake clutch can be connected to the fourth inlet, and a third pressure sensor is provided at the second outlet. The number of pressure sensors is reduced, the cost is saved, and the problem that the pressure sensor or pressure switch located in the gearbox in the prior art is prone to failure or even failure in a high temperature environment is avoided.

Description

Technical Field

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

[0002] With the development of technology, the intelligence of bulldozers has become an inevitable trend, among which the electronically controlled travel system is the basis of the intelligence of bulldozers. In order to ensure the safe and reliable operation of the electronically controlled travel system of the bulldozer, it is necessary to monitor the pressure of the hydraulic oil in the gear shift steering clutch in real time.

[0003] The method used in the prior art to monitor the pressure of the hydraulic oil in the gear shift steering clutch in real time is mainly to equip each gear with a corresponding pressure sensor or pressure switch, and detect the pressure change of each gear in real time through the pressure sensor, wherein the gear includes forward gear, reverse gear, left turn, right turn, left turn braking, right turn braking, straight braking, first gear, second gear and third gear, that is, forward gear, reverse gear, left turn, right turn, left turn braking, right turn braking, first gear, second gear and third gear are each equipped with a corresponding pressure sensor or pressure switch. Although this method can realize early warning of whether there is a hidden fault when shifting, the number of pressure sensors or pressure switches set is large, resulting in high cost, and for the pressure sensor or pressure switch located in the gearbox, it is easy to cause the pressure sensor or pressure switch to malfunction or even fail in a high temperature environment for a long time. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle hydraulic warning system and a vehicle hydraulic warning method to solve the problem that the vehicle hydraulic system warning method in the prior art requires a large number of pressure sensors or pressure switches, and the pressure sensors or pressure switches located in the gearbox are prone to malfunction or even fail in a high temperature environment.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The vehicle hydraulic warning system, the hydraulic travel system includes a forward clutch, a reverse clutch, a first gear clutch, a second gear clutch, a third gear clutch, a left turn clutch, a left brake clutch, a right turn clutch and a right brake clutch, characterized in that the vehicle hydraulic warning system includes:

[0007] a first proportional solenoid valve, a first pressure sensor and a second pressure sensor, wherein the first proportional solenoid valve is provided with a first inlet, a second inlet and a first outlet, one of the oil inlet of the forward clutch and the oil inlet of the reverse clutch can be communicated with the first inlet, one of the oil inlet of the first gear clutch, the oil inlet of the second gear clutch and the oil inlet of the third gear clutch can be communicated with the second inlet, the first outlet is provided with the first pressure sensor, and the oil inlet of the first gear clutch is provided with the second pressure sensor;

[0008] A second proportional solenoid valve and a third pressure sensor, the second proportional solenoid valve is provided with a third inlet, a fourth inlet and a second outlet, the oil inlet of the left turning clutch and one of the oil inlet of the left brake clutch can be connected to the third inlet, the oil inlet of the right turning clutch and one of the oil inlet of the right brake clutch can be connected to the fourth inlet, and the third pressure sensor is provided at the second outlet.

[0009] Preferably, the vehicle hydraulic warning system also includes a first shuttle valve, the oil inlet of the forward clutch and the oil inlet of the reverse clutch are respectively connected to the two input ends of the first shuttle valve, the output end of the first shuttle valve is connected to the first inlet, and the output end of the first shuttle valve is also connected to the first pilot chamber of the first proportional solenoid valve.

[0010] Preferably, the vehicle hydraulic warning system further comprises a second shuttle valve, and the oil inlet of the second gear clutch and the oil inlet of the third gear clutch are respectively connected to two input ends of the second shuttle valve;

[0011] The vehicle hydraulic warning system further includes a third shuttle valve, the oil inlet of the first gear clutch and the output end of the second shuttle valve are respectively connected to two input ends of the third shuttle valve, and the output end of the third shuttle valve is connected to the second inlet;

[0012] The oil inlet of the first gear clutch is also connected to the second pilot chamber of the first proportional solenoid valve, and the output end of the second shuttle valve is also connected to the third pilot chamber of the first proportional solenoid valve.

[0013] Preferably, the vehicle hydraulic warning system also includes a fourth shuttle valve, the oil inlet of the left turning clutch and the oil inlet of the left brake clutch are respectively connected to the two input ends of the fourth shuttle valve, the output end of the fourth shuttle valve is connected to the third inlet, and the output end of the fourth shuttle valve is also connected to the fourth pilot chamber of the second proportional solenoid valve.

[0014] Preferably, the vehicle hydraulic warning system also includes a fifth shuttle valve, the oil inlet of the right turning clutch and the oil inlet of the right brake clutch are respectively connected to the two input ends of the fifth shuttle valve, the output end of the fifth shuttle valve is connected to the fourth inlet, and the output end of the fifth shuttle valve is also connected to the fifth pilot chamber of the second proportional solenoid valve.

[0015] Preferably, the first proportional solenoid valve is a three-position three-way solenoid valve; and the second proportional solenoid valve is a three-position three-way solenoid valve.

[0016] A vehicle hydraulic pressure warning method, which is applied to the above-mentioned vehicle hydraulic pressure warning system, the vehicle hydraulic pressure warning method comprises:

[0017] Acquire the running state of the vehicle; wherein the running state is formed by a combination of a running state and a gear state, the running state includes a straight forward state, a straight backward state, a left turn forward state, a left turn backward state, a right turn forward state and a right turn backward state; the gear state includes a first gear state, a second gear state, a third gear state, a left turn braking state, a right turn braking state and a straight forward braking state;

[0018] acquiring a pressure value of the first pressure sensor, a pressure value of the second pressure sensor, and a pressure value of the third pressure sensor according to the running state of the vehicle;

[0019] Whether the oil pressure of the hydraulic travel system is normal is judged according to the pressure value of the first pressure sensor, the pressure value of the second pressure sensor and the pressure value of the third pressure sensor.

[0020] Preferably, judging whether the oil pressure of the electric-controlled hydraulic travel system of the vehicle is normal according to the pressure value of the first pressure sensor, the pressure value of the second pressure sensor and the pressure value of the third pressure sensor comprises the following steps:

[0021] If the running state of the vehicle is the straight-ahead state and the first gear state, the oil inlet of the forward clutch and the first gear clutch with less force is connected to the first outlet;

[0022] If the force applied to the forward clutch is less than the force applied to the first gear clutch, the oil inlet of the forward clutch is connected to the first outlet;

[0023] Determine whether the pressure value of the first pressure sensor is less than or equal to a first set value; determine whether the pressure value of the second pressure sensor is less than or equal to a second set value;

[0024] If the pressure value of the first pressure sensor is less than or equal to the first set value, the oil pressure of the forward clutch is abnormal, and a "low oil pressure of the forward clutch" warning signal is displayed;

[0025] If the pressure value of the second pressure sensor is less than or equal to the second set value, the oil pressure of the first gear clutch is abnormal, and a warning signal of "low oil pressure of the first gear clutch" is displayed;

[0026] If the force applied to the first gear clutch is less than the force applied to the forward clutch, the oil inlet of the first gear clutch is connected to the first outlet;

[0027] Determine whether the pressure value of the second pressure sensor is less than or equal to the second set value;

[0028] If the pressure value of the second pressure sensor is less than or equal to the second set value, the oil pressure of the first gear clutch is abnormal, and a warning signal of "low oil pressure of the first gear clutch" is displayed;

[0029] The second setting value is smaller than the first setting value.

[0030] Preferably, if the running state of the vehicle is the straight-ahead state and the second-gear state, the oil inlet of the one with less force between the forward clutch and the second-gear clutch is connected to the first outlet;

[0031] If the force on the forward clutch is less than the force on the second-gear clutch, the oil inlet of the forward clutch is connected to the first outlet;

[0032] Determining whether the pressure value of the first pressure sensor is less than or equal to the first set value;

[0033] If the pressure value of the first pressure sensor is less than or equal to the first set value, the oil pressure of the forward clutch is abnormal, and a "low oil pressure of the forward clutch" warning signal is displayed;

[0034] If the force applied to the second-gear clutch is less than the force applied to the forward clutch, the oil inlet of the second-gear clutch is connected to the first outlet;

[0035] Determining whether the pressure value of the first pressure sensor is less than or equal to the first set value;

[0036] If the pressure value of the first pressure sensor is less than or equal to the first set value, the oil pressure of the second gear clutch is abnormal, and a "low oil pressure of the second gear clutch" warning signal is displayed.

[0037] Preferably, if the vehicle is in the left-turn forward state, the oil inlet of the left-turn clutch is connected to the second outlet;

[0038] Determining whether the pressure value of the third pressure sensor is less than or equal to a third set value;

[0039] If the pressure value of the third pressure sensor is less than or equal to the third set value, the oil pressure of the left-turn clutch is abnormal, and a warning signal of "low oil pressure of the left-turn clutch" is displayed;

[0040] If the vehicle is in the right-turn forward state, the oil inlet of the right-turn clutch is connected to the second outlet;

[0041] Determining whether the pressure value of the third pressure sensor is less than or equal to a third set value;

[0042] If the pressure value of the third pressure sensor is less than or equal to the third set value, the oil pressure of the right turn clutch is abnormal, and a "low oil pressure of the right turn clutch" warning signal is displayed.

[0043] Beneficial effects of the present invention:

[0044] The object of the present invention is to provide a vehicle hydraulic warning system and a vehicle hydraulic warning method, the vehicle hydraulic warning system comprises a first proportional solenoid valve, a first pressure sensor and a second pressure sensor, and also comprises a second proportional solenoid valve and a third pressure sensor. When the vehicle is running, the vehicle's running state can only be one of a straight forward state, a straight backward state, a left turn forward state, a left turn backward state, a right turn forward state and a right turn backward state, and the vehicle's gear state can only be one of a first gear state, a second gear state, a third gear state, a left turn braking state, a right turn braking state and a straight braking state, so the oil inlet of the forward clutch and the oil inlet of the reverse clutch are set. One of the oil inlets of the first gear clutch, the second gear clutch and the third gear clutch can be connected to the second inlet, and a second pressure sensor is provided at the oil inlet of the first gear clutch. It can be understood that the oil pressure of the first gear clutch can be directly obtained through the second pressure sensor, and the oil pressure of the first gear clutch, the oil pressure of the second gear clutch and the third gear clutch can be directly obtained through the second pressure sensor. The oil pressure of the clutch and the oil pressure of the third gear clutch can also be obtained through the first pressure sensor. Taking the vehicle's running state of the straight forward state and the second gear state as an example, the oil inlet of the forward clutch and the second gear clutch with less force is connected to the first outlet. If the force on the forward clutch is less than that on the second gear clutch, the oil inlet of the forward clutch is connected to the first outlet, and the oil pressure at the oil inlet of the forward clutch is obtained through the first pressure sensor. Then, it is judged whether the oil pressure at the oil inlet of the forward clutch is normal based on the pressure value of the first pressure sensor. If the force on the second gear clutch is less than that on the forward clutch, the oil inlet of the second gear clutch is connected to the first outlet, and the oil pressure at the oil inlet of the forward clutch is obtained through the first pressure sensor. The sensor obtains the oil pressure at the oil inlet of the second gear clutch, and then determines whether the oil pressure at the oil inlet of the second gear clutch is normal based on the pressure value of the first pressure sensor, thereby realizing early warning of the oil pressure at the oil inlet of the forward clutch and the oil pressure at the oil inlet of the second gear clutch. It can be understood that if one of the oil pressure at the oil inlet of the forward clutch and the oil pressure at the oil inlet of the second gear clutch is abnormal, it is necessary to stop the vehicle for inspection and maintenance, thereby realizing early warning of the oil pressure of the forward clutch, the oil pressure of the reverse clutch, the oil pressure of the first gear clutch, the oil pressure of the second gear clutch and the oil pressure of the third gear clutch through the first proportional solenoid valve, the first pressure sensor and the second pressure sensor;One of the oil inlet of the left turning clutch and the oil inlet of the left brake clutch can be connected to the third inlet, and one of the oil inlet of the right turning clutch and the oil inlet of the right brake clutch can be connected to the fourth inlet. A third pressure sensor is provided at the second outlet. It can be understood that the oil pressure of the left turning clutch, the oil pressure of the left brake clutch, the oil pressure of the right turning clutch and the oil pressure of the right brake clutch can be obtained only through one third pressure sensor, and then the oil pressure of the left turning clutch, the oil pressure of the left brake clutch, the oil pressure of the right turning clutch and the oil pressure of the right brake clutch can be judged according to the pressure value of the third pressure sensor. Whether it is normal, thereby realizing early warning of the oil pressure of the left turning clutch, the oil pressure of the left brake clutch, the oil pressure of the right turning clutch and the oil pressure of the right brake clutch. ;

[0045] Therefore, compared with the prior art in which each gear is equipped with a corresponding pressure sensor or pressure switch, the vehicle hydraulic warning system effectively reduces the number of pressure sensors, saves costs, and avoids the problem that the pressure sensors or pressure switches located in the gearbox in the prior art are prone to malfunction or even failure in high temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of a vehicle hydraulic warning system provided by a specific embodiment of the present invention.

[0047] In the figure:

[0048] 110, forward clutch; 120, reverse clutch; 130, first gear clutch; 140, second gear clutch; 150, third gear clutch; 160, left turn clutch; 170, left brake clutch; 180, right turn clutch; 190, right brake clutch;

[0049] 1. First proportional solenoid valve; 11. First inlet; 12. Second inlet; 13. First outlet; 14. First pilot chamber; 15. Second pilot chamber; 16. Third pilot chamber;

[0050] 2. A first pressure sensor;

[0051] 3. A second pressure sensor;

[0052] 4. Second proportional solenoid valve; 41. Third inlet; 42. Fourth inlet; 43. Second outlet; 44. Fourth pilot chamber; 45. Fifth pilot chamber;

[0053] 5. The first shuttle valve;

[0054] 6. Second shuttle valve;

[0055] 7. The third shuttle valve;

[0056] 8. Fourth shuttle valve;

[0057] 9. Fifth shuttle valve;

[0058] 10. The third pressure sensor. DETAILED DESCRIPTION

[0059] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0060] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0063] The present invention provides a vehicle hydraulic warning system, such as Figure 1As shown, the vehicle hydraulic warning system includes a first proportional solenoid valve 1, a first pressure sensor 2 and a second pressure sensor 3. The first proportional solenoid valve 1 is provided with a first inlet 11, a second inlet 12 and a first outlet 13. One of the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 can be connected to the first inlet 11, and one of the oil inlet of the first gear clutch 130, the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 can be connected to the second inlet 12. The first outlet 13 is provided with a first pressure sensor 2. A second pressure sensor 3 is provided at the oil inlet of the clutch 130; the vehicle hydraulic warning system also includes a second proportional solenoid valve 4 and a third pressure sensor 10, the second proportional solenoid valve 4 is provided with a third inlet 41, a fourth inlet 42 and a second outlet 43, the oil inlet of the left turning clutch 160 and one of the oil inlets of the left braking clutch 170 can be connected to the third inlet 41, the oil inlet of the right turning clutch 180 and one of the oil inlet of the right braking clutch 190 can be connected to the fourth inlet 42, and a third pressure sensor 10 is provided at the second outlet 43.

[0064] like Figure 1As shown, when the vehicle is running, the vehicle's running state can only be one of the straight forward state, the straight backward state, the left turn forward state, the left turn backward state, the right turn forward state and the right turn backward state, and the vehicle's gear state can only be one of the first gear state, the second gear state, the third gear state, the left turn braking state, the right turn braking state and the straight braking state. Therefore, one of the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 is arranged to be connected to the first inlet 11, so that the oil pressure of the forward clutch 110 and the oil pressure of the reverse clutch 120 can be obtained only by a first pressure sensor 2, and then the oil pressure of the forward clutch 110 is judged according to the pressure value of the first pressure sensor 2. The oil pressure of the forward clutch 110 and the oil pressure of the reverse clutch 120 are detected to be normal, thereby realizing early warning of the oil pressure of the forward clutch 110 and the oil pressure of the reverse clutch 120; one of the oil inlet of the first gear clutch 130, the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 is arranged to be connected to the second inlet 12, and a second pressure sensor 3 is arranged at the oil inlet of the first gear clutch 130. It can be understood that the oil pressure of the first gear clutch 130 can be directly obtained through the second pressure sensor 3, and the oil pressure of the first gear clutch 130, the oil pressure of the second gear clutch 140 and the oil pressure of the third gear clutch 150 can also be obtained through the first pressure sensor 2, wherein the running state of the vehicle is the straight forward state and the second gear state. Taking the state as an example, the oil inlet of the one with less force between the forward clutch 110 and the second gear clutch 140 is connected to the first outlet 13. If the force on the forward clutch 110 is less than that on the second gear clutch 140, the oil inlet of the forward clutch 110 is connected to the first outlet 13, and the oil pressure at the oil inlet of the forward clutch 110 is obtained through the first pressure sensor 2, and then the oil pressure at the oil inlet of the forward clutch 110 is judged according to the pressure value of the first pressure sensor 2. If the force on the second gear clutch 140 is less than that on the forward clutch 110, the oil inlet of the second gear clutch 140 is connected to the first outlet 13, and the oil pressure at the oil inlet of the second gear clutch 140 is obtained through the first pressure sensor 2, and then the oil pressure at the oil inlet of the second gear clutch 140 is judged according to the pressure value of the first pressure sensor 2. Whether the oil pressure at the oil inlet of the second gear clutch 140 is normal is judged according to the pressure value of the first pressure sensor 2, so as to realize early warning of the oil pressure at the oil inlet of the forward clutch 110 and the oil pressure at the oil inlet of the second gear clutch 140. It can be understood that if one of the oil pressure at the oil inlet of the forward clutch 110 and the oil pressure at the oil inlet of the second gear clutch 140 is abnormal, it is necessary to stop the vehicle for inspection and maintenance, so that the oil pressure of the forward clutch 110, the oil pressure of the reverse clutch 120, the oil pressure of the first gear clutch 130, the oil pressure of the second gear clutch 140 and the oil pressure of the third gear clutch 150 can be realized through the first proportional solenoid valve 1, the first pressure sensor 2 and the second pressure sensor 3;It is arranged that one of the oil inlet of the left turning clutch 160 and the oil inlet of the left brake clutch 170 can be communicated with the third inlet 41, and one of the oil inlet of the right turning clutch 180 and the oil inlet of the right brake clutch 190 can be communicated with the fourth inlet 42. A third pressure sensor 10 is provided at the second outlet 43. It can be understood that the oil pressure of the left turning clutch 160, the oil pressure of the left brake clutch 170, the oil pressure of the right turning clutch 180 and the oil pressure of the right brake clutch 190 can be obtained only by one third pressure sensor 10, and then the oil pressure of the left turning clutch 160, the oil pressure of the left brake clutch 170, the oil pressure of the right turning clutch 180 and the oil pressure of the right brake clutch 190 can be judged according to the pressure value of the third pressure sensor 10, so as to realize early warning of the oil pressure of the left turning clutch 160, the oil pressure of the left brake clutch 170, the oil pressure of the right turning clutch 180 and the oil pressure of the right brake clutch 190. It is understandable that when the left brake clutch 170 and the right brake clutch 190 work simultaneously, straight-ahead braking can be achieved. ;

[0065] Therefore, compared with the prior art in which each gear is equipped with a corresponding pressure sensor or pressure switch, the vehicle hydraulic warning system effectively reduces the number of pressure sensors, saves costs, and avoids the problem that the pressure sensors or pressure switches located in the gearbox in the prior art are prone to malfunction or even failure in high temperature environments.

[0066] In this embodiment, the first proportional solenoid valve 1 is a three-position three-way solenoid valve; the second proportional solenoid valve 4 is a three-position three-way solenoid valve. Figure 1 As shown, along Figure 1 In the left and right directions, the first proportional solenoid valve 1 includes a first station, a second station and a third station sequentially distributed from left to right; the first proportional solenoid valve 1 includes a fourth station, a fifth station and a sixth station sequentially distributed from left to right.

[0067] Among them, Figure 1 As shown, the vehicle hydraulic warning system also includes a first shuttle valve 5, the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 are respectively connected to the two input ends of the first shuttle valve 5, the output end of the first shuttle valve 5 is connected to the first inlet 11, and the output end of the first shuttle valve 5 is also connected to the first pilot chamber 14 of the first proportional solenoid valve 1. Specifically, a first pressure sensor 2 is provided at the first outlet 13. This arrangement enables one of the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 to be connected to the first outlet 13; by setting the output end of the first shuttle valve 5 to be connected to the first pilot chamber 14 of the first proportional solenoid valve 1, when the vehicle is in the forward gear state, the product of the oil pressure at the oil inlet of the forward clutch 110 and the force area of ​​the first pilot chamber 14 is used to determine which station of the first proportional solenoid valve 1 is working.

[0068] Among them, Figure 1 As shown, the vehicle hydraulic warning system also includes a second shuttle valve 6, and the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 are respectively connected to the two input ends of the second shuttle valve 6; the vehicle hydraulic warning system also includes a third shuttle valve 7, and the oil inlet of the first gear clutch 130 and the output end of the second shuttle valve 6 are respectively connected to the two input ends of the third shuttle valve 7, and the output end of the third shuttle valve 7 is connected to the second inlet 12; the oil inlet of the first gear clutch 130 is also connected to the second pilot chamber 15 of the first proportional solenoid valve 1, and the output end of the second shuttle valve 6 is also connected to the third pilot chamber 16 of the first proportional solenoid valve 1. The second shuttle valve 6 is arranged so that one of the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 can be connected to the second inlet 12. The third shuttle valve 7 is provided. When the oil inlet of the first gear clutch 130 is connected to the second inlet 12, the hydraulic oil flowing out of the oil inlet of the first gear clutch 130 will not flow into the pipeline of the second gear clutch 140 connected to the second inlet 12, and the hydraulic oil flowing out of the oil inlet of the first gear clutch 130 will not flow into the pipeline of the third gear clutch 150 connected to the second inlet 12; when the oil inlet of the second gear clutch 140 is connected to the second inlet 12, the hydraulic oil flowing out of the oil inlet of the second gear clutch 140 will not flow into the pipeline of the first gear clutch 130 connected to the second inlet 12 The second shuttle valve 6 and the third shuttle valve 7 are used in combination, so that the hydraulic oil flowing out of the oil inlet of the second gear clutch 140 will not flow into the pipeline connecting the third gear clutch 150 to the second inlet 12; when the oil inlet of the third gear clutch 150 is connected to the second inlet 12, the hydraulic oil flowing out of the oil inlet of the third gear clutch 150 will not flow into the pipeline connecting the first gear clutch 130 to the second inlet 12. The second shuttle valve 6 and the third shuttle valve 7 are used in combination, so that the hydraulic oil flowing out of the oil inlet of the third gear clutch 150 will not flow into the pipeline connecting the second inlet 12 of the second gear clutch 140. The oil inlet of the first gear clutch 130 is arranged to be connected with the second pilot chamber 15 of the first proportional solenoid valve 1. When the vehicle is in the first gear state, the product of the oil pressure at the oil inlet of the first gear clutch 130 and the force area of ​​the second pilot chamber 15 is used to determine which position of the first proportional solenoid valve 1 is working; the output end of the second shuttle valve 6 is arranged to be connected with the third pilot chamber 16 of the first proportional solenoid valve 1. When the vehicle is in the second gear state, the product of the oil pressure at the oil inlet of the second gear clutch 140 and the force area of ​​the third pilot chamber 16 is used to determine which position of the first proportional solenoid valve 1 is working; when the vehicle is in the third gear state, the product of the oil pressure at the oil inlet of the third gear clutch 150 and the force area of ​​the third pilot chamber 16 is used to determine which position of the first proportional solenoid valve 1 is working.

[0069] Among them, Figure 1As shown, the vehicle hydraulic warning system also includes a fourth shuttle valve 8, the oil inlet of the left turning clutch 160 and the oil inlet of the left brake clutch 170 are respectively connected to the two input ends of the fourth shuttle valve 8, the output end of the fourth shuttle valve 8 is connected to the third inlet 41, and the output end of the fourth shuttle valve 8 is also connected to the fourth pilot chamber 44 of the second proportional solenoid valve 4. The fourth shuttle valve 8 is arranged so that one of the oil inlet of the left turning clutch 160 and the oil inlet of the left brake clutch 170 can be connected to the third inlet 41; the output end of the fourth shuttle valve 8 is arranged to be connected to the fourth pilot chamber 44 of the second proportional solenoid valve 4, when the vehicle is in a left turning state, the product of the oil pressure at the oil inlet of the left turning clutch 160 and the force area of ​​the fourth pilot chamber 44 is used to determine which station of the second proportional solenoid valve 4 is working, and when the vehicle is in a left braking state, the product of the oil pressure at the oil inlet of the left brake clutch 170 and the force area of ​​the fourth pilot chamber 44 is used to determine which station of the second proportional solenoid valve 4 is working.

[0070] Among them, Figure 1 As shown, the vehicle hydraulic warning system also includes a fifth shuttle valve 9, the oil inlet of the right turning clutch 180 and the oil inlet of the right braking clutch 190 are respectively connected to the two input ends of the fifth shuttle valve 9, the output end of the fifth shuttle valve 9 is connected to the fourth inlet 42, and the output end of the fifth shuttle valve 9 is also connected to the fifth pilot chamber 45 of the second proportional solenoid valve 4. The fifth shuttle valve 9 is arranged so that one of the oil inlet of the right turning clutch 180 and the oil inlet of the right braking clutch 190 can be connected to the fourth inlet 42; the output end of the fifth shuttle valve 9 is arranged to be connected to the fifth pilot chamber 45 of the second proportional solenoid valve 4, when the vehicle is in a right turning state, the product of the oil pressure at the oil inlet of the right turning clutch 180 and the force area of ​​the fifth pilot chamber 45 is used to determine which station of the second proportional solenoid valve 4 is working, and when the vehicle is in a right braking state, the product of the oil pressure at the oil inlet of the right braking clutch 190 and the force area of ​​the fifth pilot chamber 45 is used to determine which station of the second proportional solenoid valve 4 is working. Among them, the vehicle hydraulic warning system also includes a controller and a display. The controller is electrically connected to the first proportional solenoid valve 1, the second proportional solenoid valve 4, the first pressure sensor 2, the second pressure sensor 3, the third pressure sensor 10 and the display. The controller can control the display to display a warning signal based on the pressure values ​​detected by the first pressure sensor 2, the second pressure sensor 3 and the third pressure sensor 10.

[0071] The present invention also provides a vehicle hydraulic pressure warning method, which is applied to the above-mentioned vehicle hydraulic pressure warning system. The vehicle hydraulic pressure warning method includes:

[0072] Obtain the running state of the vehicle; wherein the running state is formed by a combination of a running state and a gear state, the running state includes a straight forward state, a straight backward state, a left turn forward state, a left turn backward state, a right turn forward state and a right turn backward state; the gear state includes a first gear state, a second gear state, a third gear state, a left turn braking state, a right turn braking state and a straight braking state.

[0073] The pressure value of the first pressure sensor 2 , the pressure value of the second pressure sensor 3 , and the pressure value of the third pressure sensor 10 are acquired according to the running state of the vehicle.

[0074] Whether the oil pressure of the hydraulic travel system is normal is judged according to the pressure value of the first pressure sensor 2 , the pressure value of the second pressure sensor 3 , and the pressure value of the third pressure sensor 10 .

[0075] Among them, Figure 1 As shown, the specific steps of judging whether the oil pressure of the hydraulic travel system is normal by the pressure value of the first pressure sensor 2, the pressure value of the second pressure sensor 3 and the pressure value of the third pressure sensor 10 include:

[0076] 1. When the vehicle is in the straight-ahead state and the first gear state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0077] If the running state of the vehicle is the straight forward state and the first gear state, the output end of the one with less force between the forward clutch 110 and the first gear clutch 130 is connected to the first outlet 13. The force of the forward clutch 110 is the product of the oil pressure of the forward clutch 110 and the first pilot chamber 14, and the force of the first gear clutch 130 is the product of the oil pressure of the first gear clutch 130 and the second pilot chamber 15.

[0078] If the force on the forward clutch 110 is less than the force on the first gear clutch 130, the oil inlet of the forward clutch 110 is connected to the first outlet 13. At this time, the first proportional solenoid valve 1 is in the second position.

[0079] Determine whether the pressure value of the first pressure sensor 2 is less than or equal to a first set value; determine whether the pressure value of the second pressure sensor 3 is less than or equal to a second set value.

[0080] If the pressure value of the first pressure sensor 2 is less than or equal to the first set value, the oil pressure of the forward clutch 110 is abnormal, and a warning signal of "low oil pressure of the forward clutch" is displayed. If the pressure value of the first pressure sensor 2 is greater than the first set value, the oil pressure of the forward clutch 110 is normal.

[0081] If the pressure value of the second pressure sensor 3 is less than or equal to the second set value, the oil pressure of the first gear clutch 130 is abnormal, and a warning signal of "low oil pressure of the first gear clutch" is displayed. If the pressure value of the second pressure sensor 3 is greater than the second set value, the oil pressure of the first gear clutch 130 is normal.

[0082] If the force on the first gear clutch 130 is smaller than the force on the forward clutch 110, the oil inlet of the first gear clutch 130 is connected to the first outlet 13. At this time, the first proportional solenoid valve 1 is in the first position.

[0083] Determine whether the second pressure sensor 3 is less than or equal to the second set value. It is understandable that at this time, the pressure value measured by the first pressure sensor 2 and the pressure value measured by the second pressure sensor 3 are both the oil pressure of the first gear clutch 130. Since the second set value is less than the first set value, the pressure value of the second pressure sensor 3 is used for determination.

[0084] If the pressure value of the second pressure sensor 3 is less than or equal to the second set value, the oil pressure of the first gear clutch 130 is abnormal, and a warning signal of "low oil pressure of the first gear clutch" is displayed. At this time, it is not determined whether the oil pressure of the forward clutch 110 is normal, and the forward clutch 110 and the first gear clutch 130 need to be stopped for inspection and maintenance.

[0085] If the pressure value of the second pressure sensor 3 is greater than the second set value, the oil pressure of the first gear clutch 130 is normal.

[0086] Among them, when the display shows a warning signal, it is necessary to stop the vehicle for inspection and maintenance.

[0087] 2. When the vehicle is in the straight-ahead, reverse and first gear state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0088] Since the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 are respectively connected to the two input ends of the first shuttle valve 5 , the output end of the first shuttle valve 5 is connected to the first inlet 11 .

[0089] Therefore, the difference between the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a straight-ahead reverse state and a first gear state and the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a straight-ahead forward state and a first gear state is that:

[0090] The “forward clutch 110 ” in the “method for determining whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a straight-ahead state and a first gear state” is replaced with “reverse clutch 120 ”.

[0091] 3. When the vehicle is in the straight ahead state and the second gear state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0092] If the running state of the vehicle is the straight forward state and the second gear state, the oil inlet of the one with less force between the forward clutch 110 and the second gear clutch 140 is connected to the first outlet 13. The force of the forward clutch 110 is the product of the oil pressure of the forward clutch 110 and the first pilot chamber 14, and the force of the second gear clutch 140 is the product of the oil pressure of the second gear clutch 140 and the third pilot chamber 16.

[0093] If the force on the forward clutch 110 is less than the force on the second gear clutch 140, the oil inlet of the forward clutch 110 is connected to the first outlet 13. At this time, the first proportional solenoid valve 1 is in the third position.

[0094] It is determined whether the pressure value of the first pressure sensor 2 is less than or equal to a first set value.

[0095] If the pressure value of the first pressure sensor 2 is less than or equal to the first set value, the oil pressure of the forward clutch 110 is abnormal, and a warning signal of "low oil pressure of the forward clutch" is displayed. At this time, it is not determined whether the oil pressure of the second clutch 140 is normal, and the vehicle needs to be stopped to check and repair the forward clutch 110 and the second clutch 140.

[0096] If the pressure value of the first pressure sensor 2 is greater than the first set value, the oil pressure of the hydraulic travel system is normal.

[0097] If the force applied to the second gear clutch 140 is less than the force applied to the forward clutch 110, the oil inlet of the second gear clutch 140 is connected to the first outlet 13. At this time, the first proportional solenoid valve 1 is in the first position.

[0098] It is determined whether the pressure value of the first pressure sensor 2 is less than or equal to a first set value.

[0099] If the pressure value of the first pressure sensor 2 is less than or equal to the first set value, the oil pressure of the second gear clutch 140 is abnormal, and a warning signal of "low oil pressure of the second gear clutch" is displayed. At this time, it is not determined whether the oil pressure of the forward clutch 110 is normal, and the forward clutch 110 and the second gear clutch 140 need to be stopped for inspection and maintenance.

[0100] If the pressure value of the first pressure sensor 2 is greater than the first set value, the oil pressure of the hydraulic travel system is normal.

[0101] 4. When the vehicle is in the straight-ahead, reverse and second gear states, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0102] Since the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 are respectively connected to the two input ends of the first shuttle valve 5 , the output end of the first shuttle valve 5 is connected to the first inlet 11 .

[0103] Therefore, the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a straight-ahead reverse state and a second gear state is different from the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a straight-ahead forward state and a second gear state in that:

[0104] The “forward clutch 110 ” in “a method for determining whether the oil pressure of a hydraulic travel system is normal when the vehicle is in a straight-ahead state and a second gear state” is replaced with “a reverse clutch 120 ”.

[0105] 5. When the vehicle is in the straight ahead state and the third gear state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0106] Since the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 are respectively connected to the two input ends of the second shuttle valve 6, the oil inlet of the first gear clutch 130 and the output end of the second shuttle valve 6 are respectively connected to the two input ends of the third shuttle valve 7, and the output end of the third shuttle valve 7 is connected to the second inlet 12.

[0107] Therefore, the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the straight forward state and the third gear state is different from the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the straight forward state and the second gear state.

[0108] The "second gear clutch 140" in "a method for determining whether the oil pressure of a hydraulic travel system is normal when the vehicle is in a straight-ahead state and a second gear state" is replaced with "a third gear clutch 150".

[0109] 6. When the vehicle is in the straight-ahead, reverse and third gear state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0110] Since the oil inlet of the forward clutch 110 and the oil inlet of the reverse clutch 120 are respectively connected to the two input ends of the first shuttle valve 5, the output end of the first shuttle valve 5 is connected to the first inlet 11; the oil inlet of the second gear clutch 140 and the oil inlet of the third gear clutch 150 are respectively connected to the two input ends of the second shuttle valve 6, the oil inlet of the first gear clutch 130 and the output end of the second shuttle valve 6 are respectively connected to the two input ends of the third shuttle valve 7, and the output end of the third shuttle valve 7 is connected to the second inlet 12.

[0111] Therefore, the difference between the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the straight-ahead reverse state and the third gear state and the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the straight-ahead forward state and the second gear state is:

[0112] Replace the "second gear clutch 140" with "third gear clutch 150" and replace the "forward clutch 110" with "reverse clutch 120" in the "method for determining whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the straight forward state and the second gear state".

[0113] 7. When the vehicle is in the left-turning forward state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0114] If the vehicle is in a left-turn forward state, the oil inlet of the left-turn clutch 160 is communicated with the second outlet 43 .

[0115] It is determined whether the pressure values ​​of the third pressure sensor 10 are all less than or equal to the third set value. At this time, the second proportional solenoid valve 4 is in the sixth position.

[0116] If the pressure value of the third pressure sensor 10 is less than or equal to the third set value, the oil pressure of the left turn clutch 160 is abnormal, and a warning signal of "low oil pressure of the left turn clutch" is displayed. If the pressure value of the third pressure sensor 10 is greater than the third set value, the oil pressure of the left turn clutch 160 is normal.

[0117] 8. When the vehicle is in the right-turning forward state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0118] If the vehicle is in a right-turn forward state, the oil inlet of the right-turn clutch 180 is connected to the second outlet 43 .

[0119] It is determined whether the pressure value of the third pressure sensor 10 is less than or equal to the third set value. At this time, the second proportional solenoid valve 4 is in the fourth position.

[0120] If the pressure value of the third pressure sensor 10 is less than or equal to the third set value, the oil pressure of the right turning clutch 180 is abnormal, and a warning signal of "low oil pressure of the right turning clutch" is displayed. If the pressure value of the third pressure sensor 10 is greater than the third set value, the oil pressure of the right turning clutch 180 is normal.

[0121] 9. When the vehicle is in the left-turn braking state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0122] Since the oil inlet of the left turning clutch 160 and the oil inlet of the left brake clutch 170 are respectively connected to the two input ends of the fourth shuttle valve 8, the output end of the fourth shuttle valve 8 is connected to the third inlet 41, and the third inlet 41 is connected to the second outlet 43. At this time, the second proportional solenoid valve 4 is in the sixth position.

[0123] Therefore, the difference between the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the left-turn braking state and the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the left-turn forward state is that:

[0124] Replace the "left turning clutch 160" with the "left braking clutch 170" in the "method for determining whether the oil pressure of the hydraulic travel system is normal when the vehicle is in a left turning forward state".

[0125] 10. When the vehicle is in the right-turn braking state, the specific steps to determine whether the oil pressure of the hydraulic travel system is normal include:

[0126] Since the oil inlet of the right turning clutch 180 and the oil inlet of the right brake clutch 190 are respectively connected to the two input ends of the fifth shuttle valve 9, the output end of the fifth shuttle valve 9 is connected to the fourth inlet 42, and the fourth inlet 42 is connected to the second outlet 43. At this time, the second proportional solenoid valve 4 is in the fourth position.

[0127] Therefore, the difference between the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the right-turn braking state and the method of judging whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the right-turn forward state is that:

[0128] Replace the "right turning clutch 180" with "right braking clutch 190" in the "method for determining whether the oil pressure of the hydraulic travel system is normal when the vehicle is in the right turning forward state".

[0129] 11. When the vehicle is in the straight-ahead braking state, the specific steps for determining whether the oil pressure of the hydraulic travel system is normal include:

[0130] It can be understood that straight-ahead braking means that the left brake clutch 170 and the right brake clutch 190 work simultaneously to achieve straight-ahead braking.

[0131] Therefore, if the running state of the vehicle is the straight-ahead braking state, the output end of the left brake clutch 170 and the right brake clutch 190 with the smaller force is connected to the second outlet 43. The force of the left brake clutch 170 is the product of the oil pressure of the left brake clutch 170 and the fourth pilot chamber 44, and the force of the right brake clutch 190 is the product of the oil pressure of the right brake clutch 190 and the fifth pilot chamber 45.

[0132] If the force of the left brake clutch 170 is less than that of the right brake clutch 190, the oil inlet of the left brake clutch 170 is connected to the second outlet 43. At this time, the second proportional solenoid valve 4 is in the fifth position.

[0133] It is determined whether the pressure value of the third pressure sensor 10 is less than or equal to a third set value.

[0134] If the pressure value of the third pressure sensor 10 is less than or equal to the third set value, the oil pressure of the left brake clutch 170 is abnormal, and a warning signal of "low oil pressure of the left brake clutch 170" is displayed. At this time, it is not determined whether the oil pressure of the right brake clutch 190 is normal, and it is necessary to stop the vehicle to check and repair the left brake clutch 170 and the right brake clutch 190.

[0135] If the pressure value of the third pressure sensor 10 is greater than the third set value, the oil pressure of the left brake clutch 170 and the oil pressure of the right turning clutch 180 are both normal.

[0136] If the force of the right brake clutch 190 is less than that of the left brake clutch 170, the oil inlet of the right brake clutch 190 is connected to the second outlet 43. At this time, the second proportional solenoid valve 4 is in the fourth position.

[0137] It is determined whether the pressure value of the third pressure sensor 10 is less than or equal to a third set value.

[0138] If the pressure value of the third pressure sensor 10 is less than or equal to the third set value, the oil pressure of the right brake clutch 190 is abnormal, and a warning signal of "low oil pressure of the right brake clutch" is displayed. At this time, it is not determined whether the oil pressure of the left brake clutch 170 is normal, and it is necessary to stop the vehicle to check and repair the left brake clutch 170 and the right brake clutch 190.

[0139] If the pressure value of the third pressure sensor 10 is greater than the third set value, the oil pressure of the left brake clutch 170 and the oil pressure of the right turning clutch 180 are both normal.

[0140] In summary, compared with the prior art in which each gear is equipped with a corresponding pressure sensor or pressure switch, the vehicle hydraulic warning method is used to control the vehicle hydraulic warning system, which effectively reduces the number of pressure sensors, saves costs, and avoids the problem that the pressure sensors or pressure switches located in the gearbox in the prior art are prone to malfunction or even failure in high temperature environments.

[0141] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vehicle hydraulic early warning method, applied to a vehicle hydraulic early warning system, wherein the hydraulic travel system comprises a forward clutch (110), a reverse clutch (120), a first gear clutch (130), a second gear clutch (140), a third gear clutch (150), a left turn clutch (160), a left brake clutch (170), a right turn clutch (180) and a right brake clutch (190), wherein: The vehicle hydraulic warning system comprises: A first proportional solenoid valve (1), a first pressure sensor (2) and a second pressure sensor (3), wherein the first proportional solenoid valve (1) is provided with a first inlet (11), a second inlet (12) and a first outlet (13), wherein an oil inlet of the forward clutch (110) and an oil inlet of the reverse clutch (120) can be communicated with the first inlet (11), and an oil inlet of the first gear clutch (130), an oil inlet of the second gear clutch (140) and an oil inlet of the third gear clutch (150) can be communicated with the second inlet (12), the first outlet (13) is provided with the first pressure sensor (2), and the oil inlet of the first gear clutch (130) is provided with the second pressure sensor (3); a second proportional solenoid valve (4) and a third pressure sensor (10), wherein the second proportional solenoid valve (4) is provided with a third inlet (41), a fourth inlet (42) and a second outlet (43), wherein one of the oil inlet of the left turning clutch (160) and the oil inlet of the left brake clutch (170) can be communicated with the third inlet (41), and one of the oil inlet of the right turning clutch (180) and the oil inlet of the right brake clutch (190) can be communicated with the fourth inlet (42), and the third pressure sensor (10) is provided at the second outlet (43); Characterized in that, the vehicle hydraulic early warning method comprises: Acquire the running state of the vehicle; wherein the running state is formed by a combination of a running state and a gear state, the running state includes a straight forward state, a straight backward state, a left turn forward state, a left turn backward state, a right turn forward state and a right turn backward state; the gear state includes a first gear state, a second gear state, a third gear state, a left turn braking state, a right turn braking state and a straight forward braking state; Acquiring the pressure value of the first pressure sensor (2), the pressure value of the second pressure sensor (3), and the pressure value of the third pressure sensor (10) according to the running state of the vehicle; judging whether the oil pressure of the hydraulic travel system is normal according to the pressure value of the first pressure sensor (2), the pressure value of the second pressure sensor (3) and the pressure value of the third pressure sensor (10); Wherein, judging whether the oil pressure of the electric-controlled hydraulic travel system of the vehicle is normal according to the pressure value of the first pressure sensor (2), the pressure value of the second pressure sensor (3) and the pressure value of the third pressure sensor (10) comprises the following steps: If the running state of the vehicle is the straight-ahead state and the first gear state, the oil inlet of the one with less force between the forward clutch (110) and the first gear clutch (130) is connected to the first outlet (13); If the force applied to the forward clutch (110) is smaller than the force applied to the first gear clutch (130), the oil inlet of the forward clutch (110) is connected to the first outlet (13); Determining whether the pressure value of the first pressure sensor (2) is less than or equal to a first set value; determining whether the pressure value of the second pressure sensor (3) is less than or equal to a second set value; If the pressure value of the first pressure sensor (2) is less than or equal to the first set value, the oil pressure of the forward clutch (110) is abnormal, and a "low oil pressure of the forward clutch" warning signal is displayed; If the pressure value of the second pressure sensor (3) is less than or equal to the second set value, the oil pressure of the first gear clutch (130) is abnormal, and a "low oil pressure of the first gear clutch" warning signal is displayed; If the force applied to the first gear clutch (130) is smaller than the force applied to the forward clutch (110), then The oil inlet of the first gear clutch (130) is in communication with the first outlet (13); Determining whether the pressure value of the second pressure sensor (3) is less than or equal to the second set value; If the pressure value of the second pressure sensor (3) is less than or equal to the second set value, the oil pressure of the first gear clutch (130) is abnormal, and a "low oil pressure of the first gear clutch" warning signal is displayed; The second setting value is smaller than the first setting value.

2. The vehicle hydraulic warning method according to claim 1, characterized in that: The vehicle hydraulic warning system also includes a first shuttle valve (5), the oil inlet of the forward clutch (110) and the oil inlet of the reverse clutch (120) are respectively connected to two input ends of the first shuttle valve (5), the output end of the first shuttle valve (5) is connected to the first inlet (11), and the output end of the first shuttle valve (5) is also connected to the first pilot chamber (14) of the first proportional solenoid valve (1).

3. The vehicle hydraulic warning method according to claim 1, characterized in that: The vehicle hydraulic warning system further comprises a second shuttle valve (6), and the oil inlet of the second gear clutch (140) and the oil inlet of the third gear clutch (150) are respectively connected to two input ends of the second shuttle valve (6); The vehicle hydraulic warning system further comprises a third shuttle valve (7), the oil inlet of the first gear clutch (130) and the output end of the second shuttle valve (6) are respectively connected to two input ends of the third shuttle valve (7), and the output end of the third shuttle valve (7) is connected to the second inlet (12); The oil inlet of the first gear clutch (130) is also connected to the second pilot chamber (15) of the first proportional solenoid valve (1), and the output end of the second shuttle valve (6) is also connected to the third pilot chamber (16) of the first proportional solenoid valve (1).

4. The vehicle hydraulic warning method according to claim 1, characterized in that: The vehicle hydraulic warning system also includes a fourth shuttle valve (8), the oil inlet of the left turning clutch (160) and the oil inlet of the left brake clutch (170) are respectively connected to the two input ends of the fourth shuttle valve (8), the output end of the fourth shuttle valve (8) is connected to the third inlet (41), and the output end of the fourth shuttle valve (8) is also connected to the fourth pilot chamber (44) of the second proportional solenoid valve (4).

5. The vehicle hydraulic warning method according to claim 1, characterized in that: The vehicle hydraulic warning system also includes a fifth shuttle valve (9), the oil inlet of the right turning clutch (180) and the oil inlet of the right braking clutch (190) are respectively connected to the two input ends of the fifth shuttle valve (9), the output end of the fifth shuttle valve (9) is connected to the fourth inlet (42), and the output end of the fifth shuttle valve (9) is also connected to the fifth pilot chamber (45) of the second proportional solenoid valve (4).

6. The vehicle hydraulic pressure warning method according to any one of claims 1 to 5, characterized in that: The first proportional solenoid valve (1) is a three-position three-way solenoid valve; the second proportional solenoid valve (4) is a three-position three-way solenoid valve.

7. The vehicle hydraulic warning method according to claim 1, characterized in that: If the running state of the vehicle is the straight-ahead state and the second-gear state, the oil inlet of the one with less force between the forward clutch (110) and the second-gear clutch (140) is connected to the first outlet (13); If the force applied to the forward clutch (110) is smaller than the force applied to the second gear clutch (140), the oil inlet of the forward clutch (110) is connected to the first outlet (13); Determining whether the pressure value of the first pressure sensor (2) is less than or equal to the first set value; If the pressure value of the first pressure sensor (2) is less than or equal to the first set value, the oil pressure of the forward clutch (110) is abnormal, and a "low oil pressure of the forward clutch" warning signal is displayed; If the force applied to the second gear clutch (140) is smaller than the force applied to the forward clutch (110), the oil inlet of the second gear clutch (140) is connected to the first outlet (13); Determining whether the pressure value of the first pressure sensor (2) is less than or equal to the first set value; If the pressure value of the first pressure sensor (2) is less than or equal to the first set value, the oil pressure of the second gear clutch (140) is abnormal, and a "low oil pressure of the second gear clutch" warning signal is displayed.

8. The vehicle hydraulic warning method according to claim 1, characterized in that: If the vehicle is in the left-turn forward state, the oil inlet of the left-turn clutch (160) is connected to the second outlet (43); determining whether the pressure value of the third pressure sensor (10) is less than or equal to a third set value; If the pressure value of the third pressure sensor (10) is less than or equal to a third set value, the oil pressure of the left-turn clutch (160) is abnormal, and a "low oil pressure of the left-turn clutch" warning signal is displayed; If the vehicle is in the right-turn forward state, the oil inlet of the right-turn clutch (180) is connected to the second outlet (43); determining whether the pressure value of the third pressure sensor (10) is less than or equal to a third set value; If the pressure value of the third pressure sensor (10) is less than or equal to a third set value, the oil pressure of the right turning clutch (180) is abnormal, and a "right turning clutch oil pressure is low" warning signal is displayed.

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