High-speed snow sweeper hydraulic system and control method thereof

Abstract

The invention discloses a high-speed snow sweeper hydraulic system and a control method thereof, and belongs to the technical field of high-speed snow sweepers, the high-speed snow sweeper hydraulic system comprises a hydraulic system and an electrical system, the electrical system is a control core of a whole vehicle and is used for driving actions of related functions of a hydraulic mechanism, and action control of the hydraulic mechanism is achieved through logic control, operation correction and other modes; the hydraulic system comprises a hydraulic oil tank, a plunger pump, a heat dissipation device, an integrated valve block, a hydraulic motor and the like. The electrical system mainly comprises a controller, a control mechanism, a sensor and the like. The snow removing device has the advantage that the snow removing effect and the working efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of high-speed snowplow technology, specifically to a high-speed snowplow hydraulic system and its control method. Background Technology

[0002] With societal development, the performance and operational requirements for snowplows are constantly increasing, and the demand for snow removal efficiency is rising, prompting snow removal equipment to develop towards high speed, high efficiency, and intelligence. For example, in places like highways and airport runways, the timeliness and thoroughness of snow removal are extremely important; even a little snow residue can affect vehicle movement and aircraft takeoffs and landings.

[0003] Currently, snowplows suffer from low snow removal efficiency and inaccurate hydraulic system control, making them unable to adapt to high-quality operations under complex conditions. Specifically, when the load is too heavy, the operating status cannot be adjusted in a timely manner, resulting in poor snow removal performance. Furthermore, the poor coordination of the various actuators in the hydraulic system affects operational efficiency. Summary of the Invention

[0004] The present invention aims to solve the technical problems mentioned in the background section above. In the first aspect, it provides a high-speed snowplow hydraulic system that can intelligently adjust the load pressure and flow rate by real-time monitoring of various parameters such as the load pressure change of the hydraulic system and the driving speed of the snowplow.

[0005] The second aspect provides a control method applied to the hydraulic system of the high-speed snowplow provided in the first aspect, which enables precise adjustment of the working state of the snowplow device. By adjusting the output power of the hydraulic pump assembly through load changes, the stability and reliability of the snowplow under complex working conditions are ensured, and the efficiency and quality of snowplow operations are comprehensively improved.

[0006] According to the first aspect, the technical solution provided by the present invention is: a high-speed snowplow hydraulic system, including an oil tank, an integrated valve block connected to the oil tank through a main oil circuit group, a hydraulic pump assembly installed on the main oil circuit group between the oil tank and the integrated valve block, and a hydraulic motor of the snowplow brush body connected to the end of the integrated valve block away from the hydraulic pump assembly. The return oil side of the hydraulic motor is connected to the oil tank through the first return oil circuit, and a return oil overflow valve is installed on the first return oil circuit. The end of the integrated valve block furthest from the hydraulic pump assembly is also connected to the pitch adjustment module of the snowplow brush body. The integrated valve block is connected to an integrated hydraulic control valve group at the other end away from the hydraulic pump assembly, and the other end of the integrated hydraulic control valve group is connected to the actuator cylinder through a hydraulic oil pipe; a third pressure sensor is provided on the integrated valve block, which is used to detect the working pressure of the hydraulic motor; It also includes a controller that is electrically connected to the integrated valve block, electrically connected to a third pressure sensor, and electrically connected to the chassis ECM and bus panel via a CAN bus; When the third pressure sensor detects excessive pressure, the controller adjusts the hydraulic oil pressure output to the pitch adjustment module through the integrated valve block to relieve the working pressure on the snowplow brush body.

[0007] In some embodiments, the hydraulic pump assembly includes a first hydraulic pump and a second hydraulic pump, and the main oil circuit assembly includes a first main oil circuit and a second main oil circuit; The integrated valve block includes an electromagnetic switch valve directly connected to the first hydraulic pump, used to control the on / off state of the first main oil circuit; The electromagnetic switch valve is divided into three circuits at the end away from the first hydraulic pump: a first oil circuit, a second oil circuit, and a third oil circuit. The first oil circuit is connected to the hydraulic motor of the snowplow brush body, the second oil circuit is connected to the integrated hydraulic control valve group through the regulating oil circuit, and the third oil circuit is connected to the third pressure sensor. The third pressure sensor detects the hydraulic oil pressure in the third oil circuit, which directly reflects the working pressure of the hydraulic motor of the snowplow brush body. The first hydraulic pump is connected to the oil tank via a return oil branch with a third relief valve installed on the side near the electromagnetic switch valve. The end of the third relief valve near the oil tank is also connected to the third oil circuit. A third check valve is installed on the third oil circuit between the pressure sensor and the return oil branch. The third check valve controls the flow direction of the third oil circuit so that the oil can only flow from the return oil branch to the third check valve. The second oil circuit is also equipped with a second pressure sensor. One side of the regulating oil circuit is connected to an overflow return oil circuit. A second overflow valve is installed on the overflow return oil circuit. The other end of the overflow return oil circuit is connected to the oil tank. The oil circuit between the second overflow valve and the oil tank is also connected to the regulating oil circuit through a two-position two-way solenoid directional valve.

[0008] In some embodiments, the second hydraulic pump is connected to the pitch adjustment module of the snowplow brush body via a second main oil circuit; One side of the second main oil circuit is connected in parallel with a pitch adjustment relief valve with an integrated valve block via a fourth oil circuit; the end of the adjustment relief valve away from the second main oil circuit is connected to the second main oil circuit via a pitch adjustment solenoid valve, and the other end of the fourth oil circuit is connected to the return oil branch. The second main oil circuit is the inlet hydraulic pipe of the pitch adjustment module. The pitch adjustment module also includes a second return oil circuit, and the end of the second return oil circuit away from the pitch adjustment module is connected to the oil tank.

[0009] In some embodiments, the integrated hydraulic valve assembly includes a first hydraulic valve and a second hydraulic valve; The first hydraulic control valve is a multi-position three-way hydraulic control directional valve, including a first working position and a second working position, as well as a first interface, a second interface and a third interface, and a first pilot port and a second pilot port. The first interface and the first pilot port are connected to the hydraulic pump assembly, and the second interface is connected to the oil tank. When the first hydraulic control valve is in the first working position, the first interface and the third interface are connected, and the second interface is closed. When the first hydraulic control valve is in the second working position, the first interface is closed, and the second and third interfaces are connected. The second hydraulic control valve is a multi-position three-way hydraulic directional valve, including a third working position and a fourth working position, as well as a fourth interface, a fifth interface, and a sixth interface, and a third pilot port. The fourth interface and the third pilot port are connected to the hydraulic pump assembly. The fifth interface is connected to the third interface of the first hydraulic control valve, and the sixth interface is connected to one side of the piston of the actuator cylinder. The other side of the piston of the actuator cylinder is connected to the hydraulic pump assembly. When the second hydraulic control valve is in the third working position, the fourth interface and the sixth interface are connected, and the fifth interface is closed. When the second hydraulic control valve is in the fourth working position, the fourth interface is closed, and the fifth interface and the sixth interface are connected.

[0010] In some embodiments, a heat dissipation device is also installed on one side of the hydraulic pump assembly. The heat dissipation device is a radiator with a large flow rate and a heat dissipation area of ​​not less than 41㎡, and the working pressure is 1.6Mpa.

[0011] In some embodiments, a liquid level sensor is installed in the oil tank, and an oil temperature sensor is installed in the first return oil line; the hydraulic motor is a high-torque cycloidal motor with a maximum speed of over 400 rpm, used for high-speed operation of the snow wipers.

[0012] According to the second aspect, the technical solution provided by the present invention is: a control method, which can be written into a computer-readable storage medium in the form of at least one piece of program code, said at least one piece of program code being adapted to be loaded and run by a controller, wherein the computer-readable storage medium is electrically connected to the controller and includes the following processing flow: when the snow wiper is working on a flat road surface or a road surface with a snow thickness ≤3cm, and the system load working pressure has not reached the system protection pressure, combined with the current engine operating speed n 发 According to formula Q 泵 =n 发 *q 泵 Calculate the maximum output flow rate Q of the hydraulic pump assembly at this time. 泵 , where q 泵 This refers to the standard displacement of the hydraulic pump assembly; combined with the displacement of the hydraulic motor of the brush body, according to formula Q... 泵 =n 刷 *q 马 The working speed n of the snow brush can be calculated. 刷 ; using the formula ω=2πn刷 / 60, calculate the current angular velocity ω of the snow brush rotation; use the formula ω=V 刷 / r, calculate the linear velocity V of the snow brush rotation. 刷 The value V is calculated by the program. 刷 The engine speed n is compared with the vehicle speed value collected by the ECM from the controller, and adjusted in real time via PID commands. 发 To ensure the snow wipers operate at high speeds while maintaining a suitable vehicle speed, when the snow wipers are working on uneven surfaces or surfaces with a thickness of ≥5cm, and the system load pressure reaches the system's protection pressure, the third pressure sensor converts the hydraulic system's pressure signal into an electrical signal and transmits it to the controller. To ensure high-speed snow removal, the controller automatically adjusts the brush body tilt adjustment cylinder to reduce the bristle's contact depth with the ground, lowering the system load pressure below the system protection pressure to restore high-speed operation. After the load pressure alarm is deactivated, the brush body automatically drops, always maintaining an optimal 200mm contact width between the snow wiper bristles and the ground, ensuring thorough snow removal.

[0013] Furthermore, the sensor includes a third pressure sensor, a liquid level sensor, and an oil temperature sensor. The pressure sensor is used to detect the real-time pressure of the hydraulic system, which can reflect whether the bristles are touching the ground too deeply. When the hydraulic system pressure detected by the pressure sensor is greater than the calibrated pressure, it reflects that the bristles are touching the ground too deeply. When the hydraulic system pressure detected by the pressure sensor is not greater than the calibrated pressure, it reflects that the bristles are not touching the ground too deeply. The first hydraulic pump is a piston pump with constant power output and a standard displacement q. 泵 With a flow rate of 130 ml / r, the displacement automatically decreases when the system pressure increases and automatically increases when the pressure decreases. Through the relationship of power = pressure × output flow, the power of the hydraulic pump assembly remains constant. The output flow and pressure of the hydraulic pump assembly can follow the actual demand of the actuator in real time. When the load pressure is low, the hydraulic pump assembly automatically reduces the output flow and pressure to reduce energy consumption. When the load increases, the hydraulic pump assembly promptly increases the flow output to ensure the constant output power of the power source.

[0014] Furthermore, the process of the controller automatically adjusting the brush body pitch cylinder includes: when the brush bristles are too deeply engaged in the ground, the hydraulic system is overloaded, and the third pressure sensor immediately transmits a set alarm pressure analog electrical signal to the controller. The controller then outputs an "open" DOH signal through its output port, controlling the pitch adjustment solenoid valve on the integrated valve block to open. The hydraulic pump assembly controls the brush body pitch cylinder to lift in time. During the lifting process, the brush bristle engagement depth gradually decreases until it reaches the normal operating state. At this time, the third pressure sensor transmits a normal operating pressure signal to the controller, which clears the alarm. The controller outputs a "closed" DOH signal, and the pitch cylinder stops moving. At this time, the hydraulic system is in the normal operating state.

[0015] The advantages of this invention compared to existing technologies are as follows: 1. By acquiring real-time data from the third pressure sensor and correcting the control through logical operations of the controller program, the system pressure and flow rate of the pitch adjustment module can be adjusted in real time to ensure that the snow removal device maintains the best fit with the ground, effectively improving the snow removal effect and work efficiency; 2. By acquiring real-time data from the liquid level sensor, oil temperature sensor, third pressure sensor, and second pressure sensor, and adjusting the system parameters of the hydraulic motor in real time through the controller, it can be effectively used for the rapid snow removal needs of highways and airport runways, and can complete the task efficiently.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic system according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the integrated valve block shown; Figure 3 yes Figure 1 A schematic diagram of the integrated hydraulic control valve assembly shown in the figure; Figure 4 A schematic diagram of the pitch adjustment module according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the electrical connections of the control system according to an embodiment of the present invention.

[0018] In the attached diagram: 1. Oil tank; 2. First main oil circuit; 3. Integrated valve block; 4. First hydraulic pump; 5. Hydraulic motor; 6. First return oil circuit; 7. Return oil overflow valve; 8. Integrated hydraulic control valve assembly; 9. Actuating cylinder; 10. Cooling device; 11. Return oil branch circuit; 12. Third pressure sensor; 13. Second pressure sensor; 14. Regulating oil circuit; 15. Overflow return oil circuit; 16. Oil temperature sensor; 17. Liquid level sensor; 18. Second main oil circuit; 19. Second hydraulic pump; 20. Second return oil circuit; 21. Pitch adjustment module; 31. Electromagnetic switch valve; 32. First oil circuit; 33. Second oil circuit; 34. Third oil circuit; 35. Third relief valve; 36. Third check valve; 37. Fourth oil circuit; 38. Pitch adjustment solenoid valve; 39. Second relief valve; 811. First working station; 812. Second working station; 813. First interface; 814. Second interface; 815. Third interface; 816. First pilot port; 817. Second pilot port; 821. Third working station; 822. Fourth working station; 823. Fourth interface; 824. Fifth interface; 825. Sixth interface; 826. Third pilot port. Detailed Implementation

[0019] The present invention will now be described in further detail.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Combination Figure 1 As shown, this embodiment is a hydraulic system and control method for a high-speed snowplow, including a hydraulic part and an electrical part. The hydraulic part includes an oil tank 1, an integrated valve block 3 connected to the oil tank 1 through a main oil circuit group, a first hydraulic pump 4 installed on the first main oil circuit 2 between the oil tank 1 and the integrated valve block 3, and a second hydraulic pump 19 installed on the second main oil circuit 18 between the oil tank 1 and the integrated valve block 3. The end of the integrated valve block 3 away from the first hydraulic pump 4 is connected to the hydraulic motor 5 of the snowplow brush body; the end of the integrated valve block 3 away from the first hydraulic pump 4 is also connected to the pitch adjustment module 21.

[0022] like Figure 2 As shown, the integrated valve block 3 includes an electromagnetic switch valve 31 directly connected to the first hydraulic pump 4, used to control the opening and closing of the first main oil circuit 2; the end of the electromagnetic switch valve 31 away from the first hydraulic pump 4 is divided into three circuits, the first oil circuit 32 is connected to the hydraulic motor 5 of the snowplow brush body, the second oil circuit 33 is connected to the integrated hydraulic control valve group 8 through the regulating oil circuit 14, and the third oil circuit 34 is connected to the third pressure sensor 12. like Figure 2 As shown, the side of the first hydraulic pump 4 near the solenoid switch valve 31 is connected to the oil tank 1 through the return oil branch 11 of the third relief valve 35 with an opening pressure of 2 MPa. The end of the third relief valve 35 near the oil tank 1 is also connected to the third oil circuit 34. A third check valve 36 is also installed on the third oil circuit 34 between the third pressure sensor 12 and the return oil branch 11. The third check valve 36 controls the flow direction of the third oil circuit 34 so that it can only flow from the return oil branch to the first main oil circuit 2. like Figure 2 As shown, a second pressure sensor 13 is also provided on the second oil circuit 33. An overflow return oil circuit 15 is connected in parallel to one side of the regulating oil circuit 14. A second overflow valve 39 is installed on the overflow return oil circuit 15. The other end of the overflow return oil circuit 15 is connected to the oil tank 1. A two-position two-way solenoid directional valve is also connected to the oil circuit between the second overflow valve 39 and the oil tank 1. Figure 2 The 3DT shown is connected to the regulating oil circuit 14.

[0023] like Figure 2 As shown, the second hydraulic pump 19 is connected to the integrated valve block 3 and the pitch adjustment module 21 of the snowplow brush body through the second main oil circuit 18; one side of the second main oil circuit 18 is connected in parallel with the pitch adjustment overflow valve of the integrated valve block 3 through the fourth oil circuit 37; the end of the adjustment overflow valve away from the second main oil circuit 18 is connected to the second main oil circuit 18 through the pitch adjustment solenoid valve 38, and the other end of the fourth oil circuit 37 is connected to the return oil branch 11; the second main oil circuit 18 is the inlet hydraulic pipe of the pitch adjustment module 21, and the pitch adjustment module 21 also includes a second return oil circuit 20, the end of the second return oil circuit 20 away from the pitch adjustment module 21 is connected to the oil tank 1.

[0024] like Figure 2 As shown, both the solenoid switch valve 31 and the pitch adjustment solenoid valve 38 are two-position two-way solenoid valves. The two ports of the left working position of the solenoid switch valve 31 are connected, while the two ports of the right working position of the solenoid switch valve 31 are not connected. The controller can control the on / off state of the first main oil circuit 2 by controlling the working position of the solenoid switch valve 31. The specific control methods are all existing technologies and will not be described in detail here.

[0025] like Figure 2 As shown, the two ports of the lower working position of the pitch adjustment solenoid valve 38 are not connected, while the two ports of the upper working position of the solenoid switch valve 31 are connected. The controller can control the connection and disconnection of the hydraulic pipe between the second main oil circuit 18 and the fourth oil circuit 37 by controlling the working position of the pitch adjustment solenoid valve 38. The specific control methods are all existing technical means and will not be described in detail here.

[0026] like Figure 3 As shown, the integrated hydraulic valve assembly 8 includes a first hydraulic valve and a second hydraulic valve; As an optional implementation, the first hydraulic control valve can be selected as a two-position three-way hydraulic control directional valve, including a first working position 811 and a second working position 812, and further including a first interface 813, a second interface 814 and a third interface 815, and a first pilot port 816 and a second pilot port 817. The first interface 813 and the first pilot port 816 are connected to the hydraulic pump assembly, and the second interface 814 is connected to the oil tank 1. When the first hydraulic control valve is in the first working position 811, the first interface 813 and the third interface 815 are connected, and the second interface 814 is closed. When the first hydraulic control valve is in the second working position 812, the first interface 813 is closed, and the second interface 814 and the third interface 815 are connected. The second hydraulic control valve is a two-position three-way hydraulic control directional valve, including a third working position 821 and a fourth working position 822, as well as a fourth interface 823, a fifth interface 824 and a sixth interface 825, and a third pilot port 826. The fourth interface 823 and the third pilot port 826 are connected to the hydraulic pump assembly. The fifth interface 824 is connected to the third interface 815 of the first hydraulic control valve. The sixth interface 825 is connected to one side of the piston of the actuator cylinder 9, and the other side of the piston of the actuator cylinder 9 is connected to the hydraulic pump assembly. When the second hydraulic control valve is in the third working position 821, the fourth interface 823 and the sixth interface 825 are connected, and the fifth interface 824 is closed. When the second hydraulic control valve is in the fourth working position 822, the fourth interface 823 is closed, and the fifth interface 824 and the sixth interface 825 are connected.

[0027] A heat dissipation device 10 is also installed on one side of the hydraulic pump assembly. The heat dissipation device 10 adopts a radiator with a large flow rate and a heat dissipation area of ​​not less than 41㎡, and the working pressure is 1.6Mpa.

[0028] Combination Figure 1 As shown, a level sensor 17 is installed in the oil tank 1, and an oil temperature sensor 16 is installed on the first return oil circuit 6. The hydraulic motor 5 is a high-torque cycloidal motor with a maximum speed of over 400 rpm, used for high-speed operation of the snow wipers; the hydraulic pump assembly is a piston pump with a displacement q. 泵 It is 130ml / r.

[0029] like Figure 5 As shown, the electrical components include a controller, which is electrically connected to all sensors and all solenoid valves. The controller is also electrically connected to the chassis ECM and bus panel via a CAN bus. The controller acquires data such as the snowplow's speed and engine speed through the ECM.

[0030] like Figure 5 As shown, the controller includes the following processing flow: when the snow wipers are working on a flat road surface or a road surface with little snow, and the system load working pressure has not reached the system protection pressure, assuming the current engine operating speed n... 发The speed is 1800 r / min, according to the formula Q 泵 =n 发 *q 泵 Calculate the maximum output flow rate Q of the hydraulic pump assembly at this time. 泵 It can reach 230-260 L / min, where q 泵 The standard displacement of the hydraulic pump assembly is 130 ml / r; combined with the displacement of the hydraulic motor 5 of the brush body, according to formula Q... 泵 =n 刷 *q 马 The working speed n of the snow brush can be calculated. 刷 At speeds above 400 r / min; using the formula ω = 2πn 刷 / 60, calculate the current angular velocity ω of the snow brush rotation; use the formula ω=V 刷 / r, calculate the linear velocity V of the snow brush rotation. 刷 The value V is calculated by the program. 刷 The engine speed n is compared with the vehicle speed value collected by the ECM from the controller, and adjusted in real time via PID commands. 发 This ensures that the snow wipers operate at high RPMs to match the appropriate vehicle speed. like Figure 5 As shown, when the snow wiper is operating on uneven or snow-covered surfaces, if the system load pressure reaches the system's protection pressure, the pressure sensor will convert the pressure signal into an electrical signal and transmit it to the controller. To ensure high-speed snow removal, the controller will automatically adjust the brush body tilt adjustment cylinder to reduce the brush bristles' contact depth with the ground, so that the system load pressure is lower than the system protection pressure, thus restoring high-speed operation. After the load pressure alarm is cleared, the brush body will automatically fall, always maintaining optimal contact with the ground to achieve thorough snow removal.

[0031] like Figure 5 As shown, the sensor includes a pressure sensor, a liquid level sensor 17, and an oil temperature sensor 16. The pressure sensor is used to detect the real-time pressure of the hydraulic system, which can reflect whether the brush bristles are too deeply embedded in the ground. When the hydraulic system pressure detected by the pressure sensor is greater than the calibrated pressure (the calibrated pressure of the hydraulic system in this embodiment is 19 MPa), it indicates that the brush bristles are too deeply embedded in the ground. When the hydraulic system pressure detected by the pressure sensor is not greater than the calibrated pressure, it indicates that the brush bristles are not deeply embedded in the ground. like Figure 5 As shown, the hydraulic pump assembly is a piston pump with constant power output and a standard displacement q. 泵With a flow rate of 130 ml / r, the displacement automatically decreases when the system pressure increases and automatically increases when the pressure decreases. Based on the relationship between power = pressure × output flow, the power of the hydraulic pump assembly remains constant. The output flow and pressure of the hydraulic pump assembly can follow the actual needs of the actuator in real time. When the load pressure is low, the hydraulic pump assembly automatically reduces the output flow and pressure to reduce energy consumption; when the load increases, the hydraulic pump assembly promptly increases the flow output to ensure a constant power output from the power source and provide optimal performance.

[0032] Combination Figure 4 As shown, the process of the controller automatically adjusting the brush body pitch cylinder includes: During normal operation, the pitch adjustment solenoid valve 38 is in the upper working position, the second main oil circuit 18 and the fourth oil circuit 37 are connected, the fourth oil circuit 37 is connected to the return oil branch 11, and the return oil branch 11 is connected to the oil tank 1. Therefore, the pressure of the actuator of the pitch adjustment module 21 can be released, so that the brush body falls to contact the working surface.

[0033] When the brush bristles penetrate too deeply into the ground, the hydraulic system is overloaded. The third pressure sensor 12 will immediately transmit a pre-set alarm pressure analog electrical signal to the controller. After logical analysis, the controller will output a DOH (high-side digital output) signal through the output port to control the pitch adjustment solenoid valve 38 on the integrated valve block 3 to open. The pitch adjustment solenoid valve 38 is in the lower working position, and the pressure relief channel connecting the second main oil circuit 18 and the oil tank 1 is closed. Therefore, the actuator of the pitch adjustment module 21 can be pressurized, thereby controlling the pitch cylinder of the brush body to lift the snow brush in time. During the lifting process, the depth of the brush bristles penetrating the ground gradually decreases until it reaches the normal working state. At this time, the third pressure sensor 12 will transmit a normal working pressure signal to the controller. After the logical analysis alarm is cleared, the controller's DOH output port is closed, the pitch cylinder stops moving, and the hydraulic system is in the normal working state.

[0034] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulic system for a snowplow, comprising an oil tank (1), characterized in that: The oil tank (1) is connected to an integrated valve block (3) via a main oil circuit assembly. A hydraulic pump assembly is also installed on the main oil circuit assembly between the oil tank (1) and the integrated valve block (3). The end of the integrated valve block (3) away from the hydraulic pump assembly is connected to the hydraulic motor (5) of the snowplow brush body. The return oil side of the hydraulic motor (5) is connected to the oil tank (1) through the first return oil passage (6), and a return oil overflow valve (7) is installed on the first return oil passage (6); The end of the integrated valve block (3) away from the hydraulic pump assembly is also connected to the pitch adjustment module (21) of the snowplow brush body; The integrated valve block (3) is connected to an integrated hydraulic control valve group (8) at the other end away from the hydraulic pump assembly. The other end of the integrated hydraulic control valve group (8) is connected to the actuator cylinder (9) through a hydraulic oil pipe. A third pressure sensor (12) is provided on the integrated valve block (3). The third pressure sensor (12) is used to detect the working pressure of the hydraulic motor (5). It also includes a controller, which is electrically connected to the integrated valve block (3), and is electrically connected to the third pressure sensor (12). The controller is electrically connected to the chassis ECM and bus panel via bus communication. When the third pressure sensor (12) detects excessive pressure, the controller adjusts the hydraulic oil pressure output by the pitch adjustment module (21) through the integrated valve block (3) to relieve the working pressure of the snowplow brush body.

2. The hydraulic system of the high-speed snowplow truck according to claim 1, characterized in that: The hydraulic pump assembly includes a first hydraulic pump (4) and a second hydraulic pump (19), and the main oil circuit assembly includes a first main oil circuit (2) and a second main oil circuit (18). The integrated valve block (3) includes an electromagnetic switch valve (31) directly connected to the first hydraulic pump (4) for controlling the opening and closing of the first main oil circuit (2); The electromagnetic switch valve (31) is divided into three paths at the end away from the first hydraulic pump (4): the first oil path (32), the second oil path (33), and the third oil path (34). The first oil path (32) is connected to the hydraulic motor (5) of the snowplow brush body. The second oil path (33) is connected to the integrated hydraulic control valve group (8) through the regulating oil path (14). The third oil path (34) is connected to the third pressure sensor (12). The third pressure sensor (12) detects the hydraulic oil pressure in the third oil circuit (34) to obtain the working pressure of the hydraulic motor (5) of the snowplow brush body. The first hydraulic pump (4) is connected to the oil tank (1) via the return oil branch (11) of the third relief valve (35) with an opening pressure of 2 MPa on the side near the electromagnetic switch valve (31). The end of the third relief valve (35) near the oil tank (1) is also connected to the third oil circuit (34). A third check valve (36) is also installed on the third oil circuit (34) between the pressure sensor and the return oil branch (11). The third check valve (36) controls the flow direction of the third oil circuit (34) to flow only from the return oil branch to the third check valve (36). The second oil circuit (33) is also equipped with a second pressure sensor (13). One side of the regulating oil circuit (14) is connected to an overflow return oil circuit (15). A second overflow valve (39) is installed on the overflow return oil circuit (15). The other end of the overflow return oil circuit (15) is connected to the oil tank (1). The oil circuit between the second overflow valve (39) and the oil tank (1) is also connected to the regulating oil circuit (14) through a two-position two-way solenoid directional valve.

3. The hydraulic system of the high-speed snowplow according to claim 2, characterized in that: The second hydraulic pump (19) is connected to the pitch adjustment module (21) of the snowplow brush body through the second main oil circuit (18); One side of the second main oil circuit (18) is connected in parallel with the pitch adjustment relief valve of the integrated valve block (3) via the fourth oil circuit (37); the end of the adjustment relief valve away from the second main oil circuit (18) is connected to the second main oil circuit (18) via the pitch adjustment solenoid valve (38), and the other end of the fourth oil circuit (37) is connected to the return oil branch (11). The second main oil circuit (18) is the inlet hydraulic pipe of the pitch adjustment module (21). The pitch adjustment module (21) also includes a second return oil circuit (20). The end of the second return oil circuit (20) away from the pitch adjustment module (21) is connected to the oil tank (1).

4. The hydraulic system of the high-speed snowplow according to claim 2, characterized in that: The integrated hydraulic valve assembly (8) includes a first hydraulic valve and a second hydraulic valve; The first hydraulic control valve is a multi-position three-way hydraulic control directional valve, including a first working position (811) and a second working position (812), as well as a first interface (813), a second interface (814) and a third interface (815), and a first pilot port (816) and a second pilot port (817). The first interface (813) and the first pilot port (816) are connected to the hydraulic pump assembly, and the second interface (814) is connected to the oil tank (1). When the first hydraulic control valve is in the first working position (811), the first interface (813) is connected to the third interface (815), and the second interface (814) is sealed. When the first hydraulic control valve is in the second working position (812), the first interface (813) is sealed, and the second interface (814) and the third interface (815) are connected. The second hydraulic control valve is a multi-position three-way hydraulic control directional valve, including a third working position (821) and a fourth working position (822), as well as a fourth interface (823), a fifth interface (824) and a sixth interface (825), and a third pilot port (826); The fourth interface (823) and the third pilot port (826) are connected to the hydraulic pump assembly, the fifth interface (824) is connected to the third interface (815) of the first hydraulic control valve, the sixth interface (825) is connected to one side of the piston of the actuator cylinder (9), and the other side of the piston of the actuator cylinder (9) is connected to the hydraulic pump assembly; when the second hydraulic control valve is in the third working position (821), the fourth interface (823) and the sixth interface (825) are connected, and the fifth interface (824) is closed; when the second hydraulic control valve is in the fourth working position (822), the fourth interface (823) is closed, and the fifth interface (824) and the sixth interface (825) are connected.

5. The hydraulic system of the high-speed snowplow according to claim 1, characterized in that: A heat dissipation device (10) is also installed on one side of the hydraulic pump assembly. The heat dissipation device (10) adopts a radiator with a large flow rate and a heat dissipation area of ​​not less than 41㎡, and the working pressure is 1.6Mpa.

6. The hydraulic system of the high-speed snowplow according to claim 1, characterized in that: A liquid level sensor (17) is installed in the oil tank (1), and an oil temperature sensor (16) is installed on the first return oil circuit (6); the hydraulic motor (5) is a high-torque cycloidal motor with a maximum speed of over 400 rpm, used for high-speed operation of snow wipers.

7. A control method, characterized in that: The hydraulic system of the high-speed snowplow as described in any one of claims 1-6, and capable of being written into a computer-readable storage medium in the form of at least one line of program code, said at least one line of program code being adapted to be loaded and executed by a controller, wherein the computer-readable storage medium is electrically connected to the controller and includes the following processing flow: When the snow wipers are operating on flat surfaces or surfaces with snow depth ≤3cm, and the system load pressure has not reached the system protection pressure, the operating speed n of the current engine should be considered. 发 According to formula Q 泵 =n 发 *q 泵 Calculate the maximum output flow rate Q of the hydraulic pump assembly at this time. 泵 , where q 泵 This refers to the standard displacement of the hydraulic pump assembly; The displacement q of the hydraulic motor (5) combined with the brush body 马 According to formula Q 泵 =n 刷 *q 马 To calculate the working speed n of the snow brush 刷 ; Using the formula ω=2πn 刷 / 60, calculate the current angular velocity ω of the snow brush rotation; Through the formula ω=V 刷 / r, calculate the linear velocity V of the snow brush rotation. 刷 ; The value V is calculated by the program. 刷 The engine speed n is compared with the vehicle speed value collected by the ECM from the controller, and adjusted in real time via PID commands. 发 This is to ensure that the snow wipers match the appropriate vehicle speed at high speeds; When the snow brush is operating on uneven or ≥5cm thick surfaces, when the system load working pressure reaches the system protection pressure, the third pressure sensor (12) will convert the pressure signal of the hydraulic system into an electrical signal and transmit it to the controller. At this time, the controller will automatically adjust the brush body pitch adjustment cylinder to reduce the depth of the brush bristles, so that the system load working pressure is lower than the system protection pressure, so as to restore the high-speed operation. After the load pressure alarm is released, the brush body will automatically fall, always maintaining the best fit between the brush bristles and the ground.

8. The control method according to claim 7, characterized in that, The sensors include a third pressure sensor (12), a liquid level sensor (17), and an oil temperature sensor (16); Among them, the pressure sensor is used to detect the real-time pressure of the hydraulic system and to provide timely feedback on whether the brush bristles are touching the ground too deeply. That is, when the hydraulic system pressure detected by the pressure sensor is greater than the calibrated pressure, it will report that the brush bristles are not touching the ground too deeply; and when the hydraulic system pressure detected by the pressure sensor is not greater than the calibrated pressure, it will report that the brush bristles are not touching the ground too deeply. The first hydraulic pump (4) is a piston pump with constant power output; When the system pressure increases, the displacement automatically decreases; when the system pressure decreases, the displacement automatically increases. The relationship between power = pressure × output flow is established, and the power of the hydraulic pump assembly remains constant. The output flow and pressure of the hydraulic pump assembly are adapted to follow the actual demand changes of the hydraulic motor in real time. When the load pressure is low, the hydraulic pump assembly automatically reduces the output flow and pressure to reduce energy consumption. When the load increases, the hydraulic pump assembly promptly increases the flow output to keep the power source output power constant.

9. The control method according to claim 8, characterized in that, The process by which the controller automatically adjusts the brush body pitch cylinder includes: When the brush bristles penetrate too deeply into the ground, the hydraulic system is overloaded. The third pressure sensor (12) will immediately transmit a set alarm pressure analog electrical signal to the controller. The controller will then output an "open" DOH signal through its output port to control the pitch adjustment solenoid valve (38) on the integrated valve block (3) to open. The hydraulic pump assembly controls the pitch cylinder of the brush body to lift it in time. During the lifting process, the depth of the brush bristles penetrating the ground gradually decreases until it reaches the normal operating state. At this time, the third pressure sensor (12) transmits a normal operating pressure signal to the controller, which clears the alarm. The controller outputs a "closed" DOH signal, and the pitch cylinder stops moving. At this time, the hydraulic system is in the normal operating state.

10. A controller, characterized in that, The control instructions of the control method as described in claim 7 are executed.

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