Energy-saving hydraulic steering system based on piezoelectric energy storage

Abstract

The invention discloses an energy-saving hydraulic steering system based on piezoelectric energy storage. The energy-saving hydraulic steering system mainly comprises a hub, a novel piezoelectric energy storage hydraulic cylinder, a connecting bolt, a front beam, a steering tie rod, a steering knuckle arm and a steering system hydraulic control module. Wherein the novel piezoelectric type energy storage hydraulic cylinder is a core element and mainly comprises a hydraulic cylinder working module, a hydraulic cylinder control module and a hydraulic cylinder energy storage module; the novel piezoelectric type energy storage hydraulic cylinder is used for steering driving, electricity and energy are stored, and stable energy support is provided for a vehicle steering driving system; according to the technical scheme, the energy utilization efficiency of the steering system can be effectively improved, and practicability and economical efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly relates to an energy-saving hydraulic steering system based on piezoelectric energy storage. Background Art

[0002] With the rapid development of the automobile industry, the requirements for vehicle performance are also getting higher and higher. Among them, as one of the key parts of an automobile, the performance and energy-saving performance of the steering system directly affect the performance and economy of the whole vehicle. Traditional vehicle steering systems such as hydraulic power steering systems have problems such as high energy consumption and low efficiency. In recent years, although electric power steering systems have been improved, there is still room for improvement in energy saving and power response.

[0003] Regarding the current energy consumption problem of vehicle steering, for example, a vehicle energy-saving steering system disclosed in Patent No. CN 209634555 U includes an oil tank, a steering motor, a steering pump, a steering gear, a steering cylinder and an accumulator. This utility model can complete the steering operation when the steering pump is not working, effectively reduce the working time and intensity of the steering pump, reduce the flow power loss when the steering pump is working, greatly reduce the power consumption demand, and save energy and reduce emissions. However, this energy-saving system requires a cumbersome hydraulic circuit connection, which is not convenient for a comprehensive inspection and maintenance of the steering system.

[0004] Currently, the mainstream energy storage method of a new type of piezoelectric energy storage hydraulic cylinder is a cylinder barrel energy storage type hydraulic cylinder disclosed in the typical representative Patent No. CN 110630582B. Using the two-side cylinders as energy storage units and using the control valve principle, the hydraulic energy generated when the oil cylinder retracts is recovered; and when the oil cylinder needs to work and extend, the control valve is opened again to release the stored hydraulic oil to assist the oil cylinder to extend, realizing energy reuse. However, this energy-saving method takes the auxiliary cylinder as the core, the output of the auxiliary cylinder is unstable, the response speed is average, and an additional air pump needs to be added, which is rather cumbersome.

[0005] The present invention combines a new type of piezoelectric energy storage hydraulic cylinder with the steering system and uses piezoelectric technology to recover energy; integrates the working module, the control module and the energy storage module, simplifies the hydraulic circuit of the steering system, and is convenient for a comprehensive inspection and maintenance of the entire steering system; secondly, the present invention uses electromagnetic control to make the steering system respond more quickly and output more stably; at the same time, through piezoelectric energy storage, the hydraulic energy consumption is reduced, and the energy consumption is stored as electric energy for use in the whole vehicle, not only applied to steering, which has important practical significance. Summary of the Invention

[0006] The purpose of the present invention is to provide an energy-saving hydraulic steering system based on piezoelectric energy storage, aiming to solve the problems of high energy consumption and low efficiency of traditional steering systems, and at the same time improve the dynamic performance and response speed of the system.

[0007] The energy-saving hydraulic steering system of the present invention includes a wheel hub, a new type of piezoelectric energy storage hydraulic cylinder, connecting bolts, a front beam, a steering tie rod, a steering knuckle arm, and a hydraulic control module for the steering system. Among them, the new type of piezoelectric energy storage hydraulic cylinder is the core component of the present invention, and the new type of piezoelectric energy storage hydraulic cylinder is composed of three parts: a hydraulic cylinder working module, a hydraulic cylinder control module, and a hydraulic cylinder energy storage module. During the steering process, the piezoelectric unit is deformed under the action of an external force, converting mechanical energy into electrical energy and storing it in the energy storage module to provide additional energy assistance for the whole vehicle.

[0008] To achieve the above technical objectives and reach the above technical effects, the technical solution of the present invention is as follows:

[0009] An energy-saving hydraulic steering system based on piezoelectric energy storage mainly includes: a wheel hub, a new type of piezoelectric energy storage hydraulic cylinder, connecting bolts, a front beam, a steering tie rod, a steering knuckle arm, and a hydraulic control module for the steering system.

[0010] The new type of piezoelectric energy storage hydraulic cylinder is characterized in that it includes a hydraulic cylinder working module, a hydraulic cylinder control module, and a hydraulic cylinder energy storage module;

[0011] The hydraulic cylinder working module includes a hydraulic cylinder block, a piston rod, a buffer sleeve, a piston, a piston fixing nut, a piston rod seal ring, a piston seal ring, an oil inlet / outlet for the rodless cavity of the hydraulic cylinder, and an oil inlet / outlet for the rod cavity of the hydraulic cylinder;

[0012] The hydraulic cylinder control module includes a control valve body, a moving iron core, a seal ring, an energized coil, a spring baffle, a spring, an oil inlet / outlet for the control valve oil, an energized wire, and an oil inlet / outlet for the piezoelectric oil cavity;

[0013] The hydraulic cylinder energy storage module includes a piezoelectric unit, a capacitor, an energized wire, a piezoelectric oil port, a piezoelectric oil cavity, and a piezoelectric energy conversion unit.

[0014] The piezoelectric energy conversion unit includes a charging resistor, a thermistor, a zener diode, and a switch;

[0015] The hydraulic control module for the steering system includes a left piezoelectric energy storage hydraulic cylinder, a right piezoelectric energy storage hydraulic cylinder, a three-position four-way solenoid valve A, a three-position four-way solenoid valve B, a hydraulic pump, an oil pipe, and a fuel tank.

[0016] In any of the above technical solutions, further, two of the new type of piezoelectric energy storage hydraulic cylinders are used for steering drive and power storage and energy storage to achieve the maximum energy-saving effect.

[0017] In any of the above technical solutions, further, the hydraulic cylinder control module adopts electromagnetic control to control the oil pressure in the piezoelectric oil cavity, thereby controlling the deformation of the piezoelectric unit and performing piezoelectric energy conversion.

[0018] In any of the above technical solutions, further, the piezoelectric energy conversion unit stores piezoelectric energy. When the switch is turned to A, the capacitor is charged; when the switch is turned to B, the capacitor discharges energy.

[0019] In any of the above technical solutions, further, the piezoelectric energy conversion unit uses a charging resistor, a thermistor, and a zener diode to protect the piezoelectric energy storage circuit to prevent overcurrent and overvoltage in the circuit.

[0020] An energy-saving hydraulic steering system based on piezoelectric energy storage using the above design solution, compared with the prior art, the steering axle of the present invention is designed to use two new piezoelectric energy storage hydraulic cylinders for steering drive; a new piezoelectric energy storage hydraulic cylinder is designed. Among them, the new piezoelectric energy storage hydraulic cylinder, as the core component of the present invention, is composed of a working module, a control module, and an energy storage module. During the steering process, through the control module, the extra hydraulic oil pressure of the hydraulic cylinder is guided to the piezoelectric energy storage oil cavity. The piezoelectric unit is deformed by an external force, converting mechanical energy into electrical energy and storing it in the capacitor to provide additional auxiliary energy for the vehicle. The present invention provides a detailed structure of an energy-saving hydraulic steering system based on piezoelectric energy storage, with a detailed description of its internal structure and a vivid and specific implementation method description. It can be applied to various industrial and transportation fields, improving the energy recovery during the steering drive of the whole vehicle and improving the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which form a part of the specification, show several aspects of the present invention, and the accompanying drawings together with the following description illustrate the working principle of the present invention. In the drawings:

[0022] Figure 1 is a schematic structural diagram of an energy-saving hydraulic steering system based on piezoelectric energy storage;

[0023] Figure 2 is a schematic internal structure diagram of the new piezoelectric energy storage hydraulic cylinder of the present invention;

[0024] Figure 3 is a schematic internal structure diagram of the control valve of the present invention;

[0025] Figure 4 is a schematic diagram of the piezoelectric energy conversion principle;

[0026] Figure 5 is a schematic diagram of the hydraulic control principle of the steering system

[0027] The meanings of the reference numerals in the drawings are as follows:

[0028] 1. Wheel hub, 2. New type piezoelectric energy storage hydraulic cylinder, 3. Connecting bolt, 4. Front beam, 5. Steering tie rod, 6. Steering knuckle arm; 10. Hydraulic cylinder working module, 11. Hydraulic cylinder block, 12. Piston rod, 13. Buffer sleeve, 14. Piston, 15. Piston fixing nut, 16. Piston rod seal ring, 17. Piston seal ring, 18. Hydraulic cylinder rodless cavity inlet / outlet oil port, 19. Hydraulic cylinder rod cavity inlet / outlet oil port; 20. Hydraulic cylinder control module, 21. Control valve body, 22. Moving iron core, 23. Seal ring, 24. Energized coil, 25. Spring baffle, 26. Spring, 27. Control valve oil inlet / outlet, 28. Energized wire, 29. Piezoelectric oil cavity inlet / outlet; 30. Hydraulic cylinder energy storage module, 31. Piezoelectric unit, 32. Capacitor, 33. Energized wire, 34. Piezoelectric oil port, 35. Piezoelectric oil cavity, 40. Piezoelectric energy conversion unit, 41. Charging resistor, 42. Thermistor, 43. Zener diode, 44. Switch; 50 Steering system hydraulic control module, 51. Left piezoelectric energy storage hydraulic cylinder, 52. Right piezoelectric energy storage hydraulic cylinder, 53. Three-position four-way solenoid valve A, 54. Three-position four-way solenoid valve B, 55. Hydraulic pump, 56. Oil pipe, 57. Fuel tank. Detailed implementation mode

[0029] The technical solution of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other, and the specific embodiments cited are not intended to limit the present invention.

[0030] As Figure 1 shown, for the convenience of observation, the overall steering system is unfolded and marked. The core component of this system, the new type piezoelectric energy storage hydraulic cylinder (2), is connected to the steering knuckle arm (6) and the front beam (3) through the connecting bolt (3); the steering knuckle arm (6) is connected to the transverse tie rod (5) through the connecting bolt (3).

[0031] As Figure 2As shown in the figure, the novel piezoelectric energy storage hydraulic cylinder (2) includes a hydraulic cylinder working module (10), a hydraulic cylinder control module (20), and a hydraulic cylinder energy storage module (30); the hydraulic cylinder working module (10) includes a hydraulic cylinder body (11), a piston rod (12), a buffer sleeve (13), a piston (14), a piston fixing nut (15), a piston rod sealing ring (16), a piston sealing ring (17), a hydraulic cylinder rodless cavity inlet / outlet (18), and a hydraulic cylinder rod cavity inlet / outlet (19); the hydraulic cylinder control module (20) includes a control valve body (21), a moving iron core (22), a sealing ring (23), an energized coil (24), a spring baffle (25), a spring (26), a control valve hydraulic fluid inlet / outlet (27), an energized wire (28), and a piezoelectric oil cavity inlet / outlet (29); the hydraulic cylinder energy storage module (30) includes a piezoelectric unit (31), a capacitor (32), an energized wire (33), a piezoelectric oil port (34), a piezoelectric oil cavity (35), a piezoelectric energy conversion unit (40), a charging resistor (41), a thermistor (42), a zener diode (43), and a switch (44); during the steering process, through the control module, the extra hydraulic pressure of the hydraulic cylinder is guided to the piezoelectric energy storage oil cavity, and the piezoelectric unit (31) is deformed by an external force. The mechanical energy is converted into electrical energy through the piezoelectric energy conversion unit (40) and stored in the capacitor (32) to provide additional auxiliary energy for the vehicle.

[0032] As Figure 3 shown in the figure, the hydraulic cylinder control module (20) includes a control valve body (21), a moving iron core (22), a sealing ring (23), an energized coil (24), a spring baffle (25), a spring (26), a control valve hydraulic fluid inlet / outlet (27), an energized wire (28), and a piezoelectric oil cavity inlet / outlet (29); when the energized coil (24) is energized, the movement of the moving iron core (22) is controlled, so as to compress / retract the spring baffle (25) to achieve the control of the hydraulic fluid flow of the control valve.

[0033] As Figure 4 shown in the figure, the piezoelectric energy conversion unit (40) includes a charging resistor (41), a thermistor (42), a zener diode (43), and a switch (44); through this unit, the piezoelectric energy is converted and stored. When the switch (44) is turned to A, the capacitor (32) is charged. When the switch (44) is turned to B, the capacitor (32) discharges energy; at the same time, the charging resistor (41), the thermistor (42), and the zener diode (43) are used to protect the piezoelectric energy storage circuit to prevent overcurrent and overvoltage of the circuit.

[0034] As Figure 5As shown in the figure, the hydraulic control module (50) of the steering system includes a left piezoelectric energy storage hydraulic cylinder (51), a right piezoelectric energy storage hydraulic cylinder (52), a three-position four-way solenoid valve A (53), a three-position four-way solenoid valve B (54), a hydraulic pump (55), a hydraulic pipe (56), and a fuel tank (57); the hydraulic control module (50) of the steering system supplies oil through the hydraulic pump (55), and at the same time controls the three-position four-way solenoid valve A (53) and the three-position four-way solenoid valve B (54). Through the hydraulic pipe (56), it provides hydraulic pressure for the left piezoelectric energy storage hydraulic cylinder (51) and the right piezoelectric energy storage hydraulic cylinder (52), so that the hydraulic cylinders on both sides extend / retract respectively, thereby controlling the vehicle steering.

[0035] The working principle of the present invention is as follows:

[0036] When the steering system works, it provides pressure through the hydraulic system to drive the hydraulic cylinder to retract / extend, so that the axle steers; the new piezoelectric energy storage hydraulic cylinder stores electrical energy by retracting / extending, stores the electrical energy in the capacitor, and provides a stable and continuous power assist energy source for the steering system.

[0037] When the steering system works, the working actions of the steering system are divided into two parts: the steering system turns to the right and the steering system turns to the left:

[0038] 1. The steering system turns to the right:

[0039] a. Movement of the left hub (1) of the steering system: The hydraulic pump (55) supplies oil through the hydraulic control module (50) of the steering system. The three-position four-way solenoid valve A (53) is energized, and the hydraulic oil passes through the left position of the solenoid valve and is supplied to the left piezoelectric energy storage hydraulic cylinder (51) through the hydraulic control module (50) of the steering system. Hydraulic oil with a certain pressure enters from the rod-end inlet / outlet (19) of the hydraulic cylinder, filling the rod-end oil cavity, pushing the hydraulic cylinder piston (14) to move downward in the hydraulic cylinder, and at the same time, the hydraulic cylinder piston rod (12) retracts inward, causing the left hub (1) of the steering system to deflect to the right. At the same time, the hydraulic oil in the rodless cavity is compressed, and the hydraulic oil with a certain pressure in the rodless cavity enters through the control valve oil inlet / outlet (27) on the control valve body (21), thereby pushing the spring baffle (25) in the control valve to be compressed, allowing the hydraulic oil to enter from the piezoelectric oil cavity inlet / outlet (29) and filling the piezoelectric oil cavity (35). At this time, the hydraulic oil with a certain pressure compresses the piezoelectric unit (31) through the piezoelectric oil port (34). The piezoelectric unit (31) deforms under the external force, and the mechanical energy is converted into electrical energy and stored in the capacitor through the piezoelectric energy conversion unit (40). At the same time, when the left hydraulic cylinder starts to retract, the hydraulic cylinder control module (20) in the rod-end oil cavity receives a signal through the energized wire (28), the energized coil (24) is energized, and the moving iron core (22) compresses the spring baffle (25), releasing the pressure on the piezoelectric unit (31) being squeezed. The released hydraulic oil pressure is provided to the rod-end oil cavity through the control valve oil inlet / outlet (27) to provide a small amount of assistance for the retraction of the hydraulic cylinder. At this time, the shape of the piezoelectric unit (31) in the rod-end oil cavity is restored.

[0040] b. Movement of the right wheel hub (1) of the steering system: The hydraulic pump (55) supplies oil through the hydraulic control module (50) of the steering system. The three-position four-way solenoid valve B (54) is energized, and the hydraulic oil passes through the left position of the solenoid valve and is supplied to the right piezoelectric energy storage hydraulic cylinder (52) through the hydraulic control module (50) of the steering system. The hydraulic oil with a certain pressure enters from the inlet / outlet (18) of the rodless cavity of the hydraulic cylinder, fills the rodless oil cavity, and pushes the hydraulic cylinder piston (14) to move upward in the hydraulic cylinder. At the same time, the piston rod (12) of the hydraulic cylinder extends outward, and the right wheel hub (1) of the steering system deflects to the right. At the same time, the hydraulic oil in the rod chamber is compressed, and the hydraulic oil with a certain pressure in the rod oil cavity enters through the control valve oil inlet / outlet (27) on the control valve body (21), thereby pushing the spring baffle (25) in the control valve to be compressed, so that the hydraulic oil enters from the piezoelectric oil cavity inlet / outlet (29) and fills the piezoelectric oil cavity (35). At this time, the hydraulic oil with a certain pressure compresses the piezoelectric unit (31) through the piezoelectric oil port (34). The piezoelectric unit (31) deforms under the external force, and the mechanical energy is converted into electrical energy and stored in the capacitor through the piezoelectric energy conversion unit (40). At the same time, when the right hydraulic cylinder starts to extend and work, the hydraulic cylinder control module (20) in the rodless oil cavity receives a signal through the energized wire (28), the energized coil (24) is energized, and the moving iron core (22) compresses the spring baffle (25). The pressure of the squeezed piezoelectric unit (31) is released, and the released hydraulic oil pressure is provided to the rod oil cavity through the control valve oil inlet / outlet (27) to provide a small amount of assistance for the retraction of the hydraulic cylinder. At this time, the shape of the piezoelectric unit (31) in the rod oil cavity is restored.

[0041] 2. Steering system turns to the left

[0042] a. Movement of the left hub (1) of the steering system: Through the hydraulic control module (50) of the steering system, the hydraulic pump (55) supplies oil. The three-position four-way solenoid valve A (53) is energized, and the hydraulic oil passes through the right position of the solenoid valve and is supplied to the left piezoelectric energy storage hydraulic cylinder (51) through the hydraulic control module (50) of the steering system. Hydraulic oil with a certain pressure enters from the inlet / outlet (18) of the rodless cavity of the hydraulic cylinder, fills the rodless oil cavity, and pushes the hydraulic cylinder piston (14) to move upward in the hydraulic cylinder. At the same time, the hydraulic cylinder piston rod (12) extends outward, and the left hub (1) of the steering system deflects to the left. At the same time, the hydraulic oil in the rod chamber is compressed, and the hydraulic oil with a certain pressure in the rod oil chamber enters through the control valve oil inlet / outlet (27) on the control valve body (21), thereby pushing the spring baffle (25) in the control valve to be compressed, so that the hydraulic oil enters from the piezoelectric oil chamber inlet / outlet (29) and fills the piezoelectric oil chamber (35). At this time, the hydraulic oil with a certain pressure compresses the piezoelectric unit (31) through the piezoelectric oil port (34). The piezoelectric unit (31) deforms under the external force, and the mechanical energy is converted into electrical energy through the piezoelectric energy conversion unit (40) and stored in the capacitor. At the same time, when the left hydraulic cylinder starts to extend and work, the hydraulic cylinder control module (20) in the rodless oil cavity receives a signal through the energized wire (28), the energized coil (24) is energized, and the moving iron core (22) compresses the spring baffle (25). The pressure of the squeezed piezoelectric unit (31) is released, and the released hydraulic oil pressure is provided to the rod oil cavity through the control valve oil inlet / outlet (27) to provide a small amount of assistance for the retraction of the hydraulic cylinder. At this time, the shape of the piezoelectric unit (31) in the rod oil cavity is restored.

[0043] b. Movement of the right hub (1) of the steering system: The hydraulic pump (55) supplies oil through the hydraulic control module (50) of the steering system. The three-position four-way solenoid valve B (54) is energized, and the hydraulic oil passes through the right position of the solenoid valve and is supplied to the right piezoelectric energy storage hydraulic cylinder (52) through the hydraulic control module (50) of the steering system. Hydraulic oil with a certain pressure enters from the rod chamber inlet / outlet (19) of the hydraulic cylinder, fills the rod chamber with oil, and pushes the hydraulic cylinder piston (14) to move downward in the hydraulic cylinder. At the same time, the hydraulic cylinder piston rod (12) retracts inward, and the right hub (1) of the steering system deflects to the left. At the same time, the hydraulic oil in the rodless chamber is compressed, and the hydraulic oil with a certain pressure in the rodless chamber enters through the control valve oil inlet / outlet (27) on the control valve body (21), thereby pushing the spring baffle (25) in the control valve to be compressed, enabling the hydraulic oil to enter through the piezoelectric oil chamber inlet / outlet (29) and fill the piezoelectric oil chamber (35). At this time, the hydraulic oil with a certain pressure compresses the piezoelectric unit (31) through the piezoelectric oil port (34). The piezoelectric unit (31) deforms under the external force, and the mechanical energy is converted into electrical energy and stored in the capacitor through the piezoelectric energy conversion unit (40). At the same time, when the right hydraulic cylinder starts to retract and work, the hydraulic cylinder control module (20) in the rod chamber receives a signal through the energized wire (28), the energized coil (24) is energized, and the moving iron core (22) compresses the spring baffle (25). The pressure on the piezoelectric unit (31) being squeezed is released, and the released hydraulic oil pressure is provided to the rod chamber through the control valve oil inlet / outlet (27) to provide a small amount of assistance for the retraction of the hydraulic cylinder. At this time, the shape of the piezoelectric unit (31) in the rod chamber is restored.

[0044] The technical solutions of the present invention have been described in detail above in conjunction with the accompanying drawings. The present invention proposes an energy-saving hydraulic steering system based on piezoelectric energy storage. Through the technical solutions in the present invention, a new type of piezoelectric energy storage hydraulic cylinder is designed, and the steering system is controlled for steering drive through the hydraulic control module of the steering system, realizing energy recovery during vehicle steering and providing additional energy assistance for the whole vehicle.

[0045] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An energy-saving hydraulic steering system based on piezoelectric energy storage, mainly comprising: Wheel hub (1), novel piezoelectric energy storage hydraulic cylinder (2), connecting bolts (3) and front beam (4), steering tie rod (5), steering knuckle arm (6), and steering system hydraulic control module (50); The novel piezoelectric energy storage hydraulic cylinder (2) is characterized by comprising a hydraulic cylinder working module (10), a hydraulic cylinder control module (20), and a hydraulic cylinder energy storage module (30); The hydraulic cylinder working module (10) comprises a hydraulic cylinder body (11), a piston rod (12), a buffer sleeve (13), a piston (14), a piston fixing nut (15), a piston rod sealing ring (16), a piston sealing ring (17), a hydraulic cylinder rodless chamber oil inlet / outlet (18), and a hydraulic cylinder rod chamber oil inlet / outlet (19); The hydraulic cylinder control module (20) comprises a control valve body (21), a moving iron core (22), a sealing ring (23), an energized coil (24), a spring baffle (25), a spring (26), a control valve oil inlet / outlet (27), an energized wire (28), and a piezoelectric oil chamber inlet / outlet (29); The hydraulic cylinder energy storage module (30) comprises a piezoelectric unit (31), a capacitor (32), an energized wire (33), a piezoelectric oil port (34), a piezoelectric oil chamber (35), and a piezoelectric energy conversion unit (40); The piezoelectric energy conversion unit (40) comprises a charging resistor (41), a thermistor (42), a voltage-stabilizing diode (43), and a switch (44); The steering system hydraulic control module (50) comprises a left piezoelectric energy storage hydraulic cylinder (51), a right piezoelectric energy storage hydraulic cylinder (52), a three-position four-way solenoid valve A (53), a three-position four-way solenoid valve B (54), a hydraulic pump (55), an oil pipe (56), and an oil tank (57); The energy-saving hydraulic steering system based on piezoelectric energy storage is characterized in that a steering system hydraulic control module (50) supplies oil through a hydraulic pump (55), and controls a three-position four-way solenoid valve A (53) and a three-position four-way solenoid valve B (54) at the same time, and provides oil pressure to a left piezoelectric energy storage hydraulic cylinder (51) and a right piezoelectric energy storage hydraulic cylinder (52) through an oil pipe (56), so that the hydraulic cylinders on the left and right sides respectively extend / retract, thereby controlling the steering of the vehicle; at the same time, the new piezoelectric energy storage hydraulic cylinders on the left and right sides recover energy through steering drive.

2. An energy-saving hydraulic steering system based on piezoelectric energy storage according to claim 1, characterized in that: A single novel piezoelectric energy storage hydraulic cylinder (2) has four hydraulic cylinder control modules (20) and four hydraulic cylinder energy storage modules (30) which are symmetrically distributed, and two energy storage modules on the same side are equipped with a piezoelectric energy conversion unit (40), so that energy can be recovered when the hydraulic cylinder is extended or retracted.

3. An energy-saving hydraulic steering system based on piezoelectric energy storage according to claim 1, characterized in that: The hydraulic cylinder control module (20) adopts electromagnetic control to control the oil pressure in the piezoelectric oil chamber (35), thereby controlling the deformation of the piezoelectric unit (31) and performing piezoelectric energy conversion.

4. An energy-saving hydraulic steering system based on piezoelectric energy storage according to claim 1, characterized in that: The piezoelectric energy conversion unit (40) converts and stores piezoelectric energy. When the switch (44) is turned to A, the capacitor (32) is charged; when the switch (44) is turned to B, the capacitor (32) discharges energy.

5. An energy-saving hydraulic steering system based on piezoelectric energy storage according to claim 1, characterized in that: The piezoelectric energy conversion unit (40) uses a charging resistor (41), a thermistor (42) and a voltage-stabilizing diode (43) to protect the piezoelectric energy storage circuit to prevent overcurrent and overvoltage in the circuit.

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