Hydraulic fault judgment system

Abstract

The invention discloses a hydraulic fault judgment system which is used for judging faults of a hydraulic system and belongs to the technical field of transmissions.The hydraulic fault judgment system comprises an oil tank and pressure sensors connected with the oil tank through a pressure oil pipe, the pressure sensors comprise the first pressure sensor, and the first pressure sensor is connected with the second pressure sensor in series; a filter press is arranged between the first pressure sensor and the second pressure sensor, a fifth valve element is arranged between the oil tank and the first pressure sensor, and the fifth valve element is connected with a third pressure sensor. The device can quickly judge the fault position of the gearbox hydraulic system, and effectively solves the problems of tedious processing steps and long time consumption in the prior art.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmissions, and particularly relates to a hydraulic fault judgment system. Background Art

[0002] The hydraulic system of a transmission is widely used in fields such as automobiles, and its faults are concealed and complex. Early fault diagnosis technologies mostly relied on simple sensors. Currently, the method for dealing with faults in the transmission hydraulic system is to shut down for maintenance until the fault location is found and then repair and handle it. According to the existing technical processing steps for fault handling, it takes at least several days and at most several weeks, seriously affecting normal production. Accurately judging transmission hydraulic faults is crucial for improving vehicle driving reliability, ensuring the normal operation of equipment, and enhancing production efficiency, and can effectively promote the popularization of related products and the development of the industry.

[0003] Application No. US17722470 discloses a fault detection device for a hydraulic system, a fault detection system for hydraulics, and a method for operating the fault detection device. The failure detection device includes a monitoring and failure detection unit that receives first and second pressure values from first and second pressure sensors, and includes a failure detection unit that detects a fault in at least one hydraulic operating device when a plurality of pairs of values are outside a first and second predetermined relative pressure value tolerance range. Among them, when a plurality of pairs of values exceed the first predetermined tolerance range of the relative pressure value, the fault detection unit 260 detects a fault in the pump. This patent still has room for improvement.

[0004] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the present application. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides a hydraulic fault judgment system for judging faults in a hydraulic system. This device can quickly judge the location of faults in the transmission hydraulic system, effectively solving the problems of cumbersome processing steps and long time consumption in the prior art.

[0006] To solve the above technical problems, the present invention specifically provides the following technical solutions: A hydraulic fault judgment system includes an oil tank and a pressure sensor connected to the oil tank through a pressure oil pipe. The pressure sensor includes a first pressure sensor, and a second pressure sensor is connected in series with the first pressure sensor. A pressure filter is provided between the first pressure sensor and the second pressure sensor. A fifth spool is provided between the oil tank and the first pressure sensor, and the fifth spool is connected to a third pressure sensor.

[0007] According to an embodiment of the present invention, a second spool, a third spool, and a fourth spool are connected in parallel to the end of the second pressure sensor away from the first pressure sensor, and the second spool and the third spool are connected in series. A first spool is connected in series with the second spool, and a temperature sensor is connected in series between the first spool and the second spool through an oil return circuit. The oil return circuit is communicated with an oil return cavity, and the temperature sensor is arranged in the oil return cavity.

[0008] The second spool is connected in parallel with a temperature control bypass valve. The temperature control bypass valve is connected to a cooling oil circuit and mainly monitors the oil pressure of the cooling oil circuit and the opening oil pressure of the spool. A radiator is connected in series with the temperature control bypass valve, and the radiator is connected to a fourth pressure sensor. One end of the fourth pressure sensor is connected to an output controller. A main regulating solenoid valve is provided at the end of the second pressure sensor away from the third pressure sensor, and a control valve is connected in parallel in an array at one end of the main regulating solenoid valve. Each parallel control valve is connected in series with a pressure sensor. The oil tank is connected with a filter, and the filter is connected to the first pressure sensor.

[0009] In the hydraulic fault judgment system of the present invention, various components such as pressure sensors, spools, and control valves are connected through pressure oil pipes, and the connection adopts a mixed mode of series and parallel. The connection scheme is further supplemented as follows: The oil tank is connected with a filter, the filter is connected with a gear pump, one branch of the gear pump is connected to the fifth spool, and the fifth spool is communicated with the second spool, the third spool, the main regulating solenoid valve, and the fourth spool, and is also communicated with the fourth pressure sensor. The oil coming into the temperature control bypass valve is the oil after being regulated by the third spool and the oil leaked from the plunger pump motor. When the temperature is too high, the oil flows from the temperature control bypass valve to the radiator and then to the cooling oil circuit. When the temperature is low, the oil directly goes to the cooling oil circuit.

[0010] The first spool valve and the second spool valve are connected in series separately. The main regulating solenoid valve and the fourth spool valve are both directly connected to the control valve. The control valves in which the main regulating solenoid valve and the fourth spool valve are connected in parallel in an array include a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, a sixth control valve, a seventh control valve, an eighth control valve, and a ninth control valve. Among them, a pressure sensor five is connected in series separately with the first control valve, a sensor six is connected in series separately with the second control valve, a sensor seven is connected in series separately with the third control valve, a sensor eight is connected in series separately with the fourth control valve, a sensor nine is connected in series separately with the fifth control valve, a sensor ten is connected in series separately with the sixth control valve, a sensor eleven is connected in series separately with the seventh control valve, a sensor twelve is connected in series separately with the eighth control valve, and a sensor thirteen is connected in series separately with the ninth control valve.

[0011] Pressure sensors are set at different positions in the transmission hydraulic system, such as the oil pump, clutch hydraulic cylinder, brake hydraulic cylinder, oil filter device, cooling device, and oil pipe, etc. The specific positions can be set by personnel themselves according to the positions of vulnerable parts of different vehicle models. Since the oil pressures at different positions are different, for example, the oil pressures in the main oil circuit and the clutch oil circuit usually have obvious differences. The oil pressure in the main oil circuit is relatively high to ensure that the hydraulic system has enough pressure to drive each actuator, while the oil pressure in the clutch oil circuit is relatively low, mainly because the clutch requires less pressure during operation to avoid excessive wear and damage. Thus, according to the possible pressure values at each position in the system, a judgment limit is set for the pressure sensor. By comparing the pressures between several pressure sensors, the type and position of the fault can be judged. Through fault judgment, it is timely fed back to the control system for emergency avoidance to protect the hydraulic components of the oil circuit. According to the comparison of the values between each pressure sensor, the possible position of the fault can be quickly judged, such as: Status 1: The pressure sensor four is less than 0.46 MPA, and the overall flow output of the controller is insufficient.

[0012] Status 2: The pressure sensor four is greater than 0.46 MPA, and the flow output of the controller is too large and has overflowed.

[0013] Status 3: The pressure sensor four is greater than 1 MPA, and the first spool valve is stuck, and the oil supply needs to be stopped immediately.

[0014] Status 4: The pressure sensor one is slightly greater than the pressure sensor two which is equal to the pressure sensor three, the temperature is greater than 18 °C, the filter is normal, and the temperature sensor bulb is normal.

[0015] Status 5: The pressure sensor one is slightly greater than the pressure sensor two which is equal to the pressure sensor three, the temperature is less than 18 °C, the filter is normal, and the temperature sensor bulb is faulty.

[0016] Status 6: The pressure sensor one is slightly greater than the pressure sensor two, the pressure sensor three is equal to 0, the temperature is less than 18 °C, the filter is normal, and the temperature sensor bulb is normal.

[0017] Status 7: Pressure sensor 1 is slightly greater than pressure sensor 2, pressure sensor 3 equals 0, temperature is greater than 18 °C, the filter is normal, and the temperature bulb is faulty.

[0018] Status 8: Pressure sensor 1 is much greater than pressure sensor 2, △p < 1.38 MPA, pressure sensor 3 equals 0, temperature is greater than 0 °C and less than 18 °C, there may be a blockage in the filter, and the temperature bulb is normal.

[0019] Status 9: Pressure sensor 1 is much greater than pressure sensor 2, △p < 1.38 MPA, pressure sensor 3 equals 0, temperature is less than 0 °C, the filter is normal, and the temperature bulb is normal.

[0020] Status 10: Pressure sensor 1 is much greater than pressure sensor 2, △p < 1.38 MPA, pressure sensor 3 equals pressure sensor 2, temperature is less than 18 °C, the filter is normal, and the temperature bulb is faulty or the fifth spool is stuck.

[0021] Status 11: Pressure sensor 1 is much greater than pressure sensor 2, △p < 1.38 MPA, pressure sensor 3 equals pressure sensor 2, temperature is greater than 18 °C, the filter is blocked, and the temperature bulb is normal.

[0022] Status 12: Pressure sensor 1 is much greater than pressure sensor 2, △p > 1.38 MPA, pressure sensor 3 equals pressure sensor 2, temperature is less than 18 °C, the filter is normal, and the temperature bulb is faulty or the fifth spool is stuck, and the fourth spool is stuck.

[0023] Status 13: Pressure sensor 1 is much greater than pressure sensor 2, △p > 1.38 MPA, pressure sensor 3 equals pressure sensor 2, temperature is greater than 18 °C, the filter is blocked, the temperature bulb is normal, and the fourth spool is stuck.

[0024] Note that the above exact values are only examples. In actual detection, the values may vary depending on the vehicle model and transmission type. The specific values should be based on actual measurement.

[0025] In the transmission hydraulic system, the hydraulic value and the oil temperature are closely related to the oil quality. Among them, the viscosity of the oil is one of the important factors affecting the hydraulic value. When the oil viscosity is relatively high, its fluidity is poor, and the resistance it encounters when flowing in the hydraulic system is large. This will cause the oil pump to require greater power to push the oil, resulting in an increase in the hydraulic value. On the contrary, if the oil viscosity is too low, although the fluidity improves, it may lead to a decrease in the sealing performance in the hydraulic system, and the hydraulic oil is prone to leakage, thus reducing the hydraulic value. Moreover, the viscosity of the oil is extremely sensitive to temperature changes. As the temperature rises, the viscosity decreases significantly, and the fluidity of the liquid increases; as the temperature drops, the viscosity increases, the oil thickens, and the fluidity becomes poor. Different types of oils have different viscosity-temperature characteristics. For oils with good viscosity-temperature characteristics, the viscosity changes less when the temperature changes, and the impact on the performance of the hydraulic system is also smaller. According to the corresponding curve relationship between the hydraulic value and the temperature within the normal range for different types of hydraulic oils, the body ECU can record the curve data based on the type of hydraulic oil. When the data returned by the pressure sensor and the temperature sensor shows a large difference from the data of the normal curve relationship but there is no error reported for other components, it can be determined that the hydraulic oil needs to be replaced, achieving the purpose of detecting the oil quality.

[0026] When the temperature control bypass valve or the temperature bulb fails, the hydraulic oil temperature and pressure value may rise sharply, and the temperature and pressure reach the critical value. The body ECU detects abnormal hydraulic oil data through the feedback data of the pressure and temperature sensors, and can control the transmission to actively cool down, such as reducing the gear speed by upshifting. At the same time, a fault reminder is issued. It should be noted that when it is detected that the driver increases the throttle, to avoid the driver performing accelerating behaviors such as overtaking and ensure driving safety, the body ECU will not use the behavior of upshifting to reduce the gear speed to lower the oil temperature and pressure, but will perform intervention and adjustment of the transmission temperature and pressure after the vehicle is driving smoothly.

[0027] Compared with the prior art, the beneficial effects of the present invention are: According to the possible pressure values at various positions in the system, set the judgment limit for the pressure sensor. By comparing the pressures among several pressure sensors, determine the type and location of the fault. The body ECU can record the relative curve data according to the type of hydraulic oil. When the data returned by the pressure sensor and the temperature sensor has a large difference from the normal curve relationship data but no other components report errors, it can be judged that the hydraulic oil needs to be replaced to prevent faults such as blockage of other hydraulic system components caused by oil quality problems. When the temperature control bypass valve or the temperature bulb fails, the body ECU can control the transmission to actively cool down, such as by upshifting to reduce the gear speed, and at the same time issue a fault reminder. However, when it is detected that the driver increases the throttle, to avoid the driver performing accelerating behaviors such as overtaking and ensure driving safety, the body ECU will not use the behavior of upshifting to reduce the gear speed to lower the oil temperature and pressure, but will perform transmission temperature and pressure intervention adjustment after the vehicle driving is stable. Brief Description of the Drawings

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0029] Figure 1 Schematic diagram of the hydraulic fault judgment system solution of the present invention; Figure 2 Schematic diagram of the spool solution of the present invention; Figure 3 Schematic diagram of a partial solution of the control valve of the present invention; Figure 4 Schematic diagram of a partial solution of the pressure sensor of the present invention.

[0030] Reference numerals: 1 - fuel tank; 2 - filter; 3 - gear pump; 4 - temperature control bypass valve; 5 - radiator; 6 - temperature sensor; 7 - main regulating solenoid valve; 8 - plunger pump motor system; 9 - pressure oil pipe; 10 - brake; 11 - pressure filtration; 12 - output controller; 101 - first spool valve; 102 - second spool valve; 103 - third spool valve; 104 - fourth spool valve; 105 - fifth spool valve; 201 - first pressure sensor; 202 - second pressure sensor; 203 - third pressure sensor; 204 - fourth pressure sensor; 205 - fifth pressure sensor; 206 - sixth pressure sensor; 207 - seventh pressure sensor; 208 - eighth pressure sensor; 209 - ninth pressure sensor; 210 - tenth pressure sensor; 211 - eleventh pressure sensor; 212 - twelfth pressure sensor; 213 - thirteenth pressure sensor; 301 - first control valve; 302 - second control valve; 303 - third control valve; 304 - fourth control valve; 305 - fifth control valve; 306 - sixth control valve; 307 - seventh control valve; 308 - eighth control valve; 309 - ninth control valve. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] First, the concepts involved in the present application will be described in conjunction with the accompanying drawings. It should be noted here that the following descriptions of each concept are only for making the content of the present application easier to understand, and do not represent a limitation on the protection scope of the present application; at the same time, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] Embodiment 1 As shown in the attached Figures 1-4 figures, a hydraulic fault judgment system includes a fuel tank 1 and a pressure sensor connected to the fuel tank 1 through a pressure oil pipe 9. The pressure sensor includes a first pressure sensor 201, the first pressure sensor 201 is connected in series with a second pressure sensor 202, a pressure filtration 11 is provided between the first pressure sensor 201 and the second pressure sensor 202, a fifth spool valve 105 is provided between the fuel tank 1 and the first pressure sensor 201, and the fifth spool valve 105 is connected to a third pressure sensor 203.

[0034] One end of the second pressure sensor 202, which is far away from the first pressure sensor 201, is connected in parallel with a second valve core 102, a third valve core 103 and a fourth valve core 104, and the second valve core 102 and the third valve core 103 are connected in series. The second valve core 102 is connected in series with a first valve core 101. The first valve core 101 and the second valve core 102 are connected in series with a temperature sensor 6 through an oil return circuit, and the oil return circuit is communicated with an oil return cavity, and the temperature sensor 6 is arranged in the oil return cavity.

[0035] A temperature control bypass valve 4 is connected in parallel with the second valve core 102. The temperature control bypass valve 4 is connected to a cooling oil circuit, and mainly monitors the oil pressure of the cooling oil circuit and the opening oil pressure of the valve core 101. The temperature control bypass valve 4 is connected in series with a radiator 5, and the radiator 5 is connected to the fourth pressure sensor 204. One end of the fourth pressure sensor 204 is connected with an output controller 12. One end of the second pressure sensor 202, which is far away from the third pressure sensor 203, is provided with a main regulating solenoid valve 7, and a control valve is connected in parallel in an array at one end of the main regulating solenoid valve 7. Each parallel control valve is connected in series with a pressure sensor. The fuel tank 1 is connected with a filter 2, and the filter 2 is connected with the first pressure sensor 201.

[0036] In the hydraulic fault judgment system of the present invention, components such as each pressure sensor, valve core and control valve are connected through a pressure oil pipe 9, and the connection adopts a mixed way of series and parallel. The connection scheme is further supplemented as: The fuel tank 1 is connected with the filter 2, the filter 2 is connected with a gear pump 3, one branch of the gear pump 3 is connected with a fifth valve core 105, and the fifth valve core 105 is communicated with the second valve core 102, the third valve core 103, the main regulating solenoid valve 7 and the fourth valve core 104, and is also communicated with the fourth pressure sensor 204. The oil coming to the temperature control bypass valve 4 is the oil after being regulated by the third valve core 103 and the oil leaked from the piston pump motor. When the temperature is too high, the oil flows from the temperature control bypass valve 4 to the radiator 5 and then to the cooling oil circuit. When the temperature is low, the oil directly goes to the cooling oil circuit. When the pressure is high, the oil is unloaded to the cooling oil circuit through the second valve core 102. The oil coming to the temperature control bypass valve 4 is the oil after being regulated by the third valve core 103 and the oil leaked from the piston pump motor.

[0037] The first spool valve 101 and the second spool valve 101 are connected in series separately. The main regulating solenoid valve 7 and the fourth spool valve 104 are both directly connected to the control valve. The control valves in which the main regulating solenoid valve 7 and the fourth spool valve 104 are connected in parallel in an array include a first control valve 301, a second control valve 302, a third control valve 303, a fourth control valve 304, a fifth control valve 305, a sixth control valve 306, a seventh control valve 307, an eighth control valve 308, and a ninth control valve 309. Among them, a pressure sensor five 205 is connected in series separately with the first control valve 301, a sensor six 206 is connected in series separately with the second control valve 302, a sensor seven 207 is connected in series separately with the third control valve 303, a sensor eight 208 is connected in series separately with the fourth control valve 304, a sensor nine 209 is connected in series separately with the fifth control valve 305, a sensor ten 210 is connected in series separately with the sixth control valve 306, a sensor eleven 211 is connected in series separately with the seventh control valve 307, a sensor twelve 212 is connected in series separately with the eighth control valve 308, and a sensor thirteen 213 is connected in series separately with the ninth control valve 309.

[0038] Pressure sensors are set at different positions in the transmission hydraulic system, such as the oil pump, clutch hydraulic cylinder, brake hydraulic cylinder, oil filter device, cooling device, and oil pipe, etc. The specific positions can be set by personnel themselves according to the positions of vulnerable parts of different vehicle models. Since the oil pressures at different positions are different, for example: the oil pressures in the main oil circuit and the clutch oil circuit usually have obvious differences. The oil pressure in the main oil circuit is relatively high to ensure that the hydraulic system has enough pressure to drive each actuator, while the oil pressure in the clutch oil circuit is relatively low, mainly because the pressure required when the clutch is working is small to avoid excessive wear and damage. Thus, according to the possible pressure values at each position in the system, a judgment limit is set for the pressure sensor. By comparing the pressures between several pressure sensors, the type and position of the fault can be judged. Through fault judgment, it is fed back to the control system in time for emergency avoidance and protection of the oil circuit hydraulic components. According to the comparison of the values between each pressure sensor, the possible position of the fault can be quickly judged, such as: Status 1: The pressure sensor four 204 is less than 0.46 MPA, and the overall flow rate of the output controller 12 is insufficient.

[0039] Status 2: The pressure sensor four 204 is greater than 0.46 MPA, and the flow rate of the output controller 12 is too large and has overflowed.

[0040] Status 3: The pressure sensor four 204 is greater than 1 MPA, and the first spool valve 101 is stuck, and the oil supply needs to be stopped immediately.

[0041] Status 4: The pressure sensor one 201 is slightly greater than the pressure sensor two 202 which is equal to the pressure sensor three 203, the temperature is greater than 18 °C, the filter 2 is normal, and the temperature bulb is normal.

[0042] Status 5: Pressure sensor 1 (201) is slightly greater than pressure sensor 2 (202), pressure sensor 3 (203) is equal to pressure sensor 2 (202), temperature is less than 18°C, filter 2 is normal, and the temperature bulb is faulty.

[0043] Status 6: Pressure sensor 1 (201) is slightly greater than pressure sensor 2 (202), pressure sensor 3 (203) is equal to 0, temperature is less than 18°C, filter 2 is normal, and the temperature bulb is normal.

[0044] Status 7: Pressure sensor 1 (201) is slightly greater than pressure sensor 2 (202), pressure sensor 3 (203) is equal to 0, temperature is greater than 18°C, filter 2 is normal, and the temperature bulb is faulty.

[0045] Status 8: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p < 1.38 MPA, pressure sensor 3 (203) is equal to 0, temperature is greater than 0°C and less than 18°C, there may be a blockage in filter 2, and the temperature bulb is normal.

[0046] Status 9: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p < 1.38 MPA, pressure sensor 3 (203) is equal to 0, temperature is less than 0°C, filter 2 is normal, and the temperature bulb is normal.

[0047] Status 10: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p < 1.38 MPA, pressure sensor 3 (203) is equal to pressure sensor 2 (202), temperature is less than 18°C, filter 2 is normal, and the temperature bulb is faulty or the fifth spool valve (105) is stuck.

[0048] Status 11: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p < 1.38 MPA, pressure sensor 3 (203) is equal to pressure sensor 2 (202), temperature is greater than 18°C, filter 2 is blocked, and the temperature bulb is normal.

[0049] Status 12: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p > 1.38 MPA, pressure sensor 3 (203) is equal to pressure sensor 2 (202), temperature is less than 18°C, filter 2 is normal, and the temperature bulb is faulty or the fifth spool valve (105) is stuck, and the fourth spool valve (104) is stuck.

[0050] Status 13: Pressure sensor 1 (201) is much greater than pressure sensor 2 (202), △p > 1.38 MPA, pressure sensor 3 (203) is equal to pressure sensor 2 (202), temperature is greater than 18°C, filter 2 is blocked, the temperature bulb is normal, and the fourth spool valve (104) is stuck.

[0051] It should be noted that the above exact values are only for examples. In actual detection, the values may vary depending on the vehicle model and transmission type. The specific values should be based on actual measurement.

[0052] In the transmission hydraulic system, the hydraulic value and the oil temperature are closely related to the oil quality. Among them, the viscosity of the oil is one of the important factors affecting the hydraulic value. When the oil viscosity is relatively high, its fluidity is poor, and the resistance it encounters when flowing in the hydraulic system is large. This will cause the oil pump to require more power to push the oil, resulting in an increase in the hydraulic value. On the contrary, if the oil viscosity is too low, although the fluidity becomes better, it may lead to a decline in the sealing performance in the hydraulic system, and the hydraulic oil is prone to leakage, thus reducing the hydraulic value. Moreover, the viscosity of the oil is extremely sensitive to temperature changes. As the temperature rises, the viscosity decreases significantly, and the fluidity of the liquid increases; as the temperature drops, the viscosity increases, the oil becomes thicker, and the fluidity becomes worse. Different types of oils have different viscosity-temperature characteristics. For oils with good viscosity-temperature characteristics, the viscosity changes less when the temperature changes, and the impact on the performance of the hydraulic system is also smaller. According to the corresponding curve relationship between the hydraulic value and temperature within the normal range for different types of hydraulic oils, the body ECU can record the curve data based on the type of hydraulic oil. When the data returned by the pressure sensor and the temperature sensor shows a large difference from the data of the normal curve relationship but there is no error reported for other components, it can be determined that the hydraulic oil needs to be replaced, achieving the purpose of detecting the oil quality and preventing faults such as blockage of other hydraulic system components due to oil quality problems.

[0053] When the temperature control bypass valve 4 or the temperature bulb fails, the hydraulic oil temperature and pressure value may rise sharply, and the temperature and pressure reach the critical value. The body ECU detects abnormal hydraulic oil data through the feedback data of the pressure and temperature sensors, and can control the transmission to actively cool down, such as reducing the gear speed by upshifting, and at the same time issue a fault reminder. It should be noted that when it is detected that the driver increases the throttle, to avoid the driver's accelerating behaviors such as overtaking and ensure driving safety, the body ECU will not use the behavior of upshifting to reduce the gear speed to lower the oil temperature and pressure, but will perform intervention and adjustment of the transmission temperature and pressure after the vehicle driving is stable.

[0054] The connections between the components of the present invention adopt the electrical expressions of "series" and "parallel", aiming to facilitate understanding and reduce redundancy in terms of length, making the expression of the connection methods between the components concise and to the point. In the present invention, "series": two or more components are connected end to end in sequence; "parallel": there is more than one independent channel for the oil circuit between the components forming the parallel connection.

[0055] The above embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for realizing the technology of the present invention, and do not impose any form of limitation on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, may make some changes or modifications to other equivalent embodiments, but should still be regarded as the technology or embodiments substantially the same as the present invention. In this text, specific examples are used to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only for helping to understand the method and its core idea of the present application. The above are only the preferred implementation manners of the present application. It should be noted that due to the limitation of literal expression and objectively there are infinite specific structures. For those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements, retouches or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, retouches, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, shall all be regarded as the protection scope of the present application.

Claims

1. A hydraulic fault diagnosis system, comprising an oil tank (1) and a pressure sensor connected to the oil tank (1) via a pressure oil pipe (9), Features: The pressure sensor comprises a pressure sensor 1 (201), the pressure sensor 1 (201) being connected in series with a pressure sensor 2 (202), a filter press (11) being provided between the pressure sensor 1 (201) and the pressure sensor 2 (202), a fifth valve core (105) being provided between the oil tank (1) and the pressure sensor 1 (201), and the fifth valve core (105) being connected to a pressure sensor 3 (203).

2. A hydraulic fault diagnosis system according to claim 1, characterized in that: A second valve core (102), a third valve core (103) and a fourth valve core (104) are connected in parallel at one end of the pressure sensor 2 (202) away from the pressure sensor 1 (201), and the second valve core (102) and the third valve core (103) are connected in series.

3. A hydraulic fault diagnosis system according to claim 2, characterized in that: The second valve core (102) is connected in series with the first valve core (101); the first valve core (101) and the second valve core (102) are connected in series with a temperature sensor (6) via an oil return oil circuit; the oil return oil circuit is in communication with an oil return chamber; and the temperature sensor (6) is arranged in the oil return chamber.

4. A hydraulic fault diagnosis system according to claim 2, characterized in that: The second valve core (102) is connected in parallel with a temperature control bypass valve (4), and the temperature control bypass valve (4) is connected to the cooling oil circuit.

5. A hydraulic fault diagnosis system according to claim 4, characterized in that: The temperature control bypass valve (4) is connected in series with a radiator (5), and the radiator (5) is connected to a pressure sensor four (204).

6. A hydraulic fault diagnosis system according to claim 5, characterized in that: One end of the pressure sensor 4 (204) is connected to an output controller (12).

7. A hydraulic fault diagnosis system according to claim 1, characterized in that: A main regulating solenoid valve (7) is provided at one end of the pressure sensor 2 (202) away from the pressure sensor 3 (203), and a control valve is connected in parallel to one end of the main regulating solenoid valve (7).

8. A hydraulic fault diagnosis system according to claim 7, characterized in that: Each of the control valves connected in parallel is connected in series with the pressure sensor.

9. A hydraulic fault diagnosis system according to claim 1, characterized in that: The oil tank (1) is connected to a filter (2), and the filter (2) is in communication with the pressure sensor 1 (201).

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