An electromagnetic valve structure of an automotive hydraulic system and its control method

Abstract

The present invention belongs to the solenoid valve structure of an automotive hydraulic system in the technical field of automotive hydraulic systems. The present invention also relates to a control method for the solenoid valve structure of an automotive hydraulic system. A steel ball (16), a spring II (5), and a spring seat (4) are sequentially installed inside a magnetic core body subassembly (81). A spring III (8), a valve core (7), a magnetic core body subassembly (81), a spring I (3), and a rear yoke sleeve (2) are sequentially installed inside an integral valve sleeve (9). A solenoid subassembly (1) is installed inside a housing (17). The integral valve sleeve (9) is press-fitted onto the housing (17). An O-ring I (13) and an O-ring II (14) are respectively installed in a corresponding installation groove on the outer ring of the integral valve sleeve (9). The solenoid valve structure of the automotive hydraulic system and its control method according to the present invention facilitate the realization of the switching between the slow charging state, fast charging state, pressure maintaining state, and oil discharging state of the accumulator, meeting the usage requirements of the accumulator.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive hydraulic systems. More specifically, it relates to a solenoid valve structure for an automotive hydraulic system, and the present invention also relates to a control method for the solenoid valve structure of an automotive hydraulic system. Background Art

[0002] Most automobiles need to use a hydraulic system. The oil circuit of this hydraulic system is controlled by a solenoid valve, and this hydraulic system uses a hydraulic pump as a power source to provide power. The hydraulic pump is powered by an engine connected to a transmission, or is powered by an electrical system that is powered by an engine. In some transmission systems, it is usually desirable to have a pressurizing source to provide additional pressure, and this pressurizing source provides power for the transmission before the vehicle starts for use. To provide such a pressurizing source, an accumulator needs to be added. When the vehicle transmission needs an additional pressurizing source, the pressure releases energy through the accumulator. When the pressurizing source is not needed, energy can be stored in the accumulator, and a two-way solenoid valve is required for the solenoid valve, which can both store the input pressure for the accumulator through the solenoid valve and also store it for a long time, and can release energy at any time when the vehicle transmission needs energy to meet the requirements of the hydraulic system. The existing solenoid valve structure currently uses a snap ring to squeeze a rubber sealing ring to achieve pressure holding and sealing of the accumulator. However, during the durability of the system, there are problems such as wear of rubber parts, high-pressure deformation, and inability to maintain high pressure (pressure leaks from the side of the rubber sealing ring under high pressure). Summary of the Invention

[0003] The technical problem to be solved by the present invention is: Aiming at the deficiencies of the prior art, to provide a solenoid valve structure for an automotive hydraulic system with a simple structure, which can be connected and used with the accumulator of the automotive hydraulic system, so as to facilitate the switching of the accumulator between slow charging state, fast charging state, pressure holding state, and oil discharging state, and meet the use requirements of the accumulator.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] The present invention is a solenoid valve structure for an automotive hydraulic system. A steel ball, spring II, and spring seat are sequentially installed inside the magnetic core body sub-assembly. A spring III, valve core, magnetic core body sub-assembly, spring I, and rear yoke sleeve are sequentially installed inside the integrated valve sleeve. An O-ring III is installed in the installation groove on the outer circle of the rear yoke sleeve. The solenoid sub-assembly is installed inside the housing. The integrated valve sleeve is press-fitted onto the housing. O-ring I and O-ring II are respectively installed in a corresponding installation groove on the outer circle of the integrated valve sleeve. The integrated valve sleeve of the solenoid valve structure for the automotive hydraulic system is connected to the accumulator base, and the accumulator oil circuit I and accumulator oil circuit II are provided on the accumulator base.

[0006] A valve core side groove is arranged along the axial position of the outer surface of the valve core, and one or more valve core side grooves are arranged along the circumference of the outer surface of the valve core; the cross-sectional area of each valve core side groove is set to be smaller than the cross-sectional area of the valve core hole.

[0007] The steel ball of the solenoid valve structure of the automotive hydraulic system is set to be able to move freely within the magnetic core body and will not fall out of the magnetic core body.

[0008] An oil passage groove of the spring seat is arranged on the side of the spring seat.

[0009] The solenoid valve structure of the automotive hydraulic system is set to be able to switch between slow charging state, fast charging state, pressure maintaining state, and oil discharging state.

[0010] The solenoid valve structure of the automotive hydraulic system is in the slow charging state: when the vehicle is running normally, the solenoid valve is not powered on, the oil fluid enters the solenoid valve cavity through the accumulator oil passage Ⅰ of the accumulator base, pushes the steel ball, the steel ball compresses the spring Ⅱ to cause a displacement between the steel ball and the valve core hole, and then enters the accumulator through the valve core side groove. At the same time, the oil fluid generates a hydraulic pressure on the end face of the valve core to seal the valve core and the integral valve sleeve. The accumulator is set to be in a structure for realizing the slow charging state.

[0011] The solenoid valve structure of the automotive hydraulic system is in the fast charging state: when the vehicle engine is about to stop, it is detected by the sensor that the brake is about to be stepped on, the ECU transmits a signal to the solenoid valve, the solenoid valve is powered on, the magnetic core body sub-assembly is attracted towards the rear yoke sleeve, and at the same time the spring Ⅲ pushes the valve core towards the magnetic core body, the integral valve sleeve and the valve core generate a displacement, and the oil fluid quickly enters from the accumulator oil passage Ⅰ of the accumulator base. The accumulator is set to be in a structure for realizing the fast charging state.

[0012] The solenoid valve structure of the automotive hydraulic system is in the pressure maintaining state: when the vehicle stops running, the accumulator internally stores the internal pressure through the solenoid valve seal. During the pressure maintaining process, the pressure acting on the valve core causes the valve core and the integral valve sleeve to achieve sealing, and the steel ball and the valve core hole achieve sealing through the spring Ⅱ and the hydraulic pressure acting on the steel ball. Thus, two sealing points achieve sealing. The accumulator is set to be in a structure for realizing the pressure maintaining state.

[0013] The solenoid valve structure of the automotive hydraulic system described is in the oil discharge state: When the vehicle starts, to meet the demand for the transmission pressure source, the solenoid valve is energized and opened after receiving an instruction. The magnetic core assembly is attracted towards the rear yoke sleeve end. The pressure in the small cavity rapidly relieves pressure through the valve core hole. Since the oil pressure in the accumulator oil passage II of the accumulator base cannot quickly compensate for the pressure in the small cavity, and the area of the side groove of the valve core is smaller than the area of the valve core hole, resulting in the inability to quickly supply pressure. Under the action of the force of the hydraulic pressure spring III on the small end face of the valve core, the valve core rapidly moves towards the magnetic core assembly, prompting the opening of the sealing part between the valve core and the integral valve sleeve, and the pressure is quickly released into the transmission actuator. The accumulator is configured with a structure to achieve the oil discharge state.

[0014] The present invention also relates to a control method for a solenoid valve structure of an automotive hydraulic system that can be connected and used with an accumulator of the automotive hydraulic system, thereby facilitating the switching of the accumulator between the slow charging state, fast charging state, pressure maintaining state, and oil discharge state to meet the usage requirements of the accumulator.

[0015] The control method of the solenoid valve structure of the automotive hydraulic system described includes the slow charging state, fast charging state, pressure maintaining state, and oil discharge state;

[0016] Slow charging state: When the vehicle is running normally, the solenoid valve is not energized. The oil fluid enters the solenoid valve cavity through the accumulator oil passage I of the accumulator base, pushes the steel ball, and the steel ball compresses the spring II to cause a displacement between the steel ball and the valve core hole, and then enters the accumulator through the side groove of the valve core. At the same time, the hydraulic pressure generated by the oil fluid at the end face of the valve core seals the valve core and the integral valve sleeve, and the accumulator realizes slow charging;

[0017] Fast charging state: When the vehicle engine is about to shut down and it is detected by a sensor that the brake is about to be stepped on, the ECU transmits a signal to the solenoid valve, and the solenoid valve is energized. The magnetic core assembly is attracted towards the rear yoke sleeve direction, and at the same time, the spring III pushes the valve core towards the magnetic core assembly direction. A displacement occurs between the integral valve sleeve and the valve core, and the oil fluid quickly enters the accumulator through the accumulator oil passage I of the accumulator base, and the accumulator realizes fast charging;

[0018] Pressure maintaining state: After the vehicle stops running, the accumulator stores its internal pressure through the solenoid valve seal. During the pressure maintaining process, the pressure acting on the valve core causes the valve core and the integral valve sleeve to achieve sealing, and the steel ball and the valve core hole achieve sealing through the spring II and the hydraulic pressure acting on the steel ball. Thus, two sealing points achieve sealing, and the accumulator realizes pressure maintaining;

[0019] Oil drainage state: When the vehicle starts, to meet the demand for the transmission pressure source, the solenoid valve is energized and opened after receiving the command. The magnetic core assembly is attracted towards the rear yoke sleeve end. The pressure at the small cavity is quickly relieved through the valve core hole. Since the oil pressure in the accumulator oil circuit II of the accumulator base cannot quickly compensate for the pressure in the small cavity, and the area of the side groove of the valve core is smaller than the area of the valve core hole, resulting in the inability to quickly supply pressure. The oil pressure is built up under the action of the force of the hydraulic pressure spring III on the small end face of the valve core. The valve core quickly moves towards the magnetic core assembly, prompting the opening of the seal between the valve core and the integral valve sleeve. The pressure is quickly released into the transmission actuator, and the accumulator achieves oil drainage.

[0020] Adopting the technical solution of the present invention, the working principle and beneficial effects are as described below:

[0021] The solenoid valve structure and its control method for the automotive hydraulic system according to the present invention propose an improved technical solution for the deficiencies in the prior art. The solenoid valve structure of the automotive hydraulic system can switch between slow charging state, fast charging state, pressure maintaining state, and oil discharging state. When the automotive hydraulic system solenoid valve structure is in the slow charging state: when the vehicle is running normally, the solenoid valve is de-energized, and the hydraulic oil enters the solenoid valve cavity through the oil passage of the accumulator base, pushing the steel ball. The steel ball compresses spring II to cause displacement between the steel ball and the valve core hole, and then enters the accumulator through the side groove of the valve core. At the same time, the hydraulic pressure generated by the hydraulic oil at the end face of the valve core seals the valve core 7 and the integral valve sleeve, and the accumulator realizes slow charging. When the automotive hydraulic system solenoid valve structure is in the fast charging state: when the vehicle engine is about to stop, it is detected by the sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is energized. The magnetic core body sub-assembly is attracted towards the rear yoke sleeve direction, and at the same time, spring III pushes the valve core towards the magnetic core body direction. The integral valve sleeve and the valve core generate displacement, and the hydraulic oil quickly enters the accumulator oil passage I of the accumulator base, and the accumulator realizes fast charging. When the automotive hydraulic system solenoid valve structure is in the pressure maintaining state: after the vehicle stops running, the internal pressure of the accumulator is sealed and stored through the solenoid valve. During the pressure maintaining process, the pressure acting on the valve core causes the valve core and the integral valve sleeve to be sealed, and the steel ball and the valve core hole are sealed through spring II and the hydraulic pressure acting on the steel ball. Thus, two sealing points achieve sealing, and the accumulator realizes pressure maintaining. When the automotive hydraulic system solenoid valve structure is in the oil discharging state: when the vehicle starts, to meet the demand for the pressure source of the transmission, after receiving the instruction, the solenoid valve is energized and opened. The magnetic core body sub-assembly is attracted towards the rear yoke sleeve end, and the pressure at the small cavity is quickly relieved through the valve core hole. Since the oil pressure in the accumulator oil passage II of the accumulator base cannot quickly compensate for the pressure of the small cavity, and the area of the side groove of the valve core is smaller than the area of the valve core hole, resulting in the pressure not being able to be quickly supplied, the oil pressure is established under the action of the hydraulic pressure spring III on the small end face of the valve core. The valve core quickly moves towards the magnetic core body, prompting the sealing part between the valve core and the integral valve sleeve to open, and the pressure is quickly released into the transmission actuator, and the accumulator realizes oil discharging. In this way, it is convenient and reliable to realize the control and state switching of the entire structure. The solenoid valve structure and its control method for the automotive hydraulic system according to the present invention can be connected and used with the accumulator of the automotive hydraulic system, so as to conveniently realize the switching of the accumulator between the slow charging state, fast charging state, pressure maintaining state, and oil discharging state, meeting the usage requirements of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0023] Figure 1 It is a schematic cross-sectional structure diagram of the solenoid valve structure for the automotive hydraulic system according to the present invention;

[0024] Figure 2Schematic diagram of the spool structure of the solenoid valve structure of the automotive hydraulic system according to the present invention;

[0025] Figure 3 Schematic diagram of the structure of the solenoid valve structure of the automotive hydraulic system according to the present invention;

[0026] Figure 4 Schematic diagram of the spring seat structure of the solenoid valve structure of the automotive hydraulic system according to the present invention;

[0027] Figure 5 Schematic diagram of the partial sectional structure of the solenoid valve structure of the automotive hydraulic system according to the present invention;

[0028] Figure 6 Schematic diagram of the partial sectional structure of the solenoid valve structure of the automotive hydraulic system according to the present invention;

[0029] The reference numerals in the drawings are respectively: 1, solenoid sub-assembly; 2, rear yoke sleeve; 3, spring I; 4, spring seat; 5, spring II; 6, magnetic core body; 7, spool; 8, spring III; 9, integral valve sleeve; 10, accumulator oil passage I; 11, accumulator base; 12, accumulator oil passage II; 13, O-ring I; 14, O-ring II; 15, O-ring III; 16, steel ball; 17, housing; 18, oil passage connecting the accumulator; 19, small cavity; 21, spool side groove; 22, spool hole; 31, magnetic core body side groove; 32, magnetic core body boss; 41, spring seat oil through groove; 81, magnetic core body sub-assembly; 82, contact and sealing place between the steel ball and the spool; 83, contact and sealing place between the integral valve sleeve and the spool; 90, spool end face; 91, small spool end face. Detailed implementation manners

[0030] The following is a further detailed description of the specific implementation manners of the present invention, such as the shapes, structures, mutual positions and connection relationships of the various components involved, the functions of the various parts, and the working principles, etc., with reference to the accompanying drawings:

[0031] As shown in the attached Figure 1 - attached Figure 6As shown in the figure, the present invention is a solenoid valve structure for an automotive hydraulic system. Inside the magnetic core body sub-assembly 81, a steel ball 16, a spring II 5, and a spring seat 4 are sequentially installed. Inside the integral valve sleeve 9, a spring III 8, a valve core 7, the magnetic core body sub-assembly 81, a spring I 3, and a rear yoke sleeve 2 are sequentially installed. An O-ring III 15 is installed in the installation groove on the outer circle of the rear yoke sleeve 2. The solenoid assembly 1 is installed inside the housing 17. The integral valve sleeve 9 is press-fitted onto the housing 17. An O-ring I 13 and an O-ring II 14 are respectively installed in a corresponding installation groove on the outer circle of the integral valve sleeve 9. The integral valve sleeve 9 of the solenoid valve structure of the automotive hydraulic system is connected to the accumulator base 11. The accumulator oil passage I 10 and the accumulator oil passage II 12 are provided on the accumulator base 11. For the deficiencies in the prior art, the above structure proposes an improved technical solution. The solenoid valve structure of the automotive hydraulic system can switch between slow charging state, fast charging state, pressure maintaining state, and oil discharging state. When the automotive hydraulic system solenoid valve structure is in the slow charging state: when the vehicle is running normally, the solenoid valve is not energized. The oil fluid enters the solenoid valve cavity through the accumulator oil passage I 10 of the accumulator base 11, pushes the steel ball 16, and the steel ball compresses the spring II 5 to cause a displacement between the steel ball 16 and the valve core hole 22. Then, it enters the accumulator through the side groove 21 of the valve core. At the same time, the oil fluid generates a hydraulic pressure on the end face 90 of the valve core to seal the valve core 7 and the integral valve sleeve 9, and the accumulator realizes slow charging. When the automotive hydraulic system solenoid valve structure is in the fast charging state: when the vehicle engine is about to stop, it is detected by a sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is energized. The magnetic core body sub-assembly 81 is attracted towards the rear yoke sleeve 2. At the same time, the spring III 8 pushes the valve core 7 towards the magnetic core 6. A displacement occurs between the integral valve sleeve 9 and the valve core 7. The oil fluid quickly enters the accumulator through the accumulator oil passage I 10 of the accumulator base 11, and the accumulator realizes fast charging. When the automotive hydraulic system solenoid valve structure is in the pressure maintaining state: after the vehicle stops running, the accumulator stores the internal pressure through the solenoid valve seal. During the pressure maintaining process, the pressure acting on the valve core 7 causes the valve core 7 and the integral valve sleeve 9 to be sealed. The steel ball 16 and the valve core hole 22 are sealed through the spring II 5 and the hydraulic pressure acting on the steel ball 16. Thus, two sealing points are sealed, and the accumulator realizes pressure maintaining. When the automotive hydraulic system solenoid valve structure is in the oil discharging state: when the vehicle starts, to meet the pressure source requirement of the transmission, after receiving the command, the solenoid valve is energized and opened. The magnetic core body sub-assembly 81 is attracted towards the rear yoke sleeve 2 end. The pressure at the small cavity 19 is quickly relieved from the valve core hole 22. Since the oil pressure in the accumulator oil passage II 12 of the accumulator base 11 cannot quickly compensate for the pressure of the small cavity 19, and the area of the side groove of the valve core is smaller than the area of the valve core hole 22, resulting in the pressure not being able to be quickly supplied. Under the action of the hydraulic pressure spring III 8 force on the small end face 91 of the valve core, the valve core 7 quickly moves towards the magnetic core 6, prompting the sealing point between the valve core 7 and the integral valve sleeve 9 to open, and the pressure is quickly released into the transmission actuator, and the accumulator realizes oil discharging.In this way, it is convenient and reliable to realize the control and state switching of the whole structure. The solenoid valve structure and its control method of the automotive hydraulic system according to the present invention can be connected and used with the accumulator of the automotive hydraulic system, so as to facilitate the switching of the accumulator among the slow charging state, fast charging state, pressure maintaining state, and oil discharging state, meeting the usage requirements of the accumulator.

[0032] On the outer surface of the spool 7, spool side grooves 21 are arranged along the axial position. One or more spool side grooves 21 are arranged in a circle along the outer surface of the spool 7; the cross-sectional area of each spool side groove 21 is set to be smaller than the cross-sectional area of the spool hole 22. With the above structure, the cross-sectional area of each spool side groove 21 is smaller than that of the spool hole 22, so that the pressure cannot be supplied quickly.

[0033] The steel ball 16 of the solenoid valve structure of the automotive hydraulic system is set to be able to move freely within the magnetic core body 6 and will not fall out of the magnetic core body 6. With the above structure, the reliable positioning of the steel ball is realized, and the usage requirements are met, ensuring that the whole solenoid valve can work reliably and accurately.

[0034] An oil passage groove 41 is arranged on the side of the spring seat 4.

[0035] The solenoid valve structure of the automotive hydraulic system is set to be able to switch among the slow charging state, fast charging state, pressure maintaining state, and oil discharging state. With the above structure, through the operation and control of different components, the switching of the solenoid valve structure in different states is realized, meeting the usage requirements.

[0036] When the solenoid valve structure of the automotive hydraulic system is in the slow charging state: when the vehicle is running normally, the solenoid valve is not powered on, and the oil fluid enters the solenoid valve cavity through the accumulator oil passage I 10 of the accumulator base 11, pushing the steel ball 16. The steel ball compresses the spring II 5 to cause a displacement between the steel ball 16 and the spool hole 22, and then enters the accumulator through the spool side groove 21. At the same time, the oil fluid generates a hydraulic pressure on the spool end face 90 to seal the spool 7 and the integrated valve sleeve 9. The accumulator is set to be in a structure for realizing the slow charging state.

[0037] When the solenoid valve structure of the automotive hydraulic system is in the fast charging state: when the vehicle engine is about to stop, it is detected by the sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is powered on. The magnetic core body sub-assembly 81 is attracted towards the rear yoke sleeve 2, and at the same time, the spring III 8 pushes the spool 7 towards the magnetic core body 6, causing a displacement between the integrated valve sleeve 9 and the spool 7. The oil fluid quickly enters from the accumulator oil passage I 10 of the accumulator base 11. The accumulator is set to be in a structure for realizing the fast charging state.

[0038] The solenoid valve structure of the automotive hydraulic system is in the pressure-holding state: After the vehicle stops running, the accumulator seals and stores the internal pressure through the solenoid valve. During the pressure-holding process, the pressure acting on the valve core 7 causes the valve core 7 to seal with the integrated valve sleeve 9. The steel ball 16 and the valve core hole 22 are sealed through the spring II 5 and the hydraulic pressure acting on the steel ball 16. Thus, two sealing points achieve sealing, and the accumulator is set to have a structure for achieving the pressure-holding state.

[0039] The solenoid valve structure of the automotive hydraulic system is in the oil-discharging state: When the vehicle starts, to meet the demand for the transmission pressure source, after receiving the command, the solenoid valve is energized and opened. The magnetic core body sub-assembly 81 is attracted to the end of the rear yoke sleeve 2. The pressure at the small cavity 19 is quickly relieved through the valve core hole 22. Since the oil pressure in the accumulator oil passage II 12 of the accumulator base 11 cannot quickly compensate for the pressure in the small cavity 19, and the area of the side groove of the valve core is smaller than the area of the valve core hole 22, resulting in the pressure not being able to be quickly supplied. The hydraulic pressure acting on the small end face 91 of the valve core and the force of the spring III 8 cause the valve core 7 to quickly move towards the magnetic core body 6, prompting the sealing point between the valve core 7 and the integrated valve sleeve 9 to open, and the pressure is quickly released into the transmission actuator. The accumulator is set to have a structure for achieving the oil-discharging state.

[0040] The present invention also relates to a control method for a solenoid valve structure of an automotive hydraulic system that can be connected and used with the accumulator of the automotive hydraulic system, thereby facilitating the switching of the accumulator between the slow charging state, fast charging state, pressure-holding state, and oil-discharging state to meet the usage requirements of the accumulator.

[0041] The control method for the solenoid valve structure of the automotive hydraulic system includes the slow charging state, fast charging state, pressure-holding state, and oil-discharging state;

[0042] Slow charging state: When the vehicle is running normally, the solenoid valve is not energized. The oil fluid enters the solenoid valve cavity through the accumulator oil passage I 10 of the accumulator base 11, pushes the steel ball 16, and the steel ball compresses the spring II 5 to cause the steel ball 16 and the valve core hole 22 to displace. Then, it enters the accumulator through the side groove 21 of the valve core. At the same time, the hydraulic pressure generated by the oil fluid at the end face 90 of the valve core seals the valve core 7 and the integrated valve sleeve 9, and the accumulator realizes slow charging;

[0043] Fast charging state: When the vehicle engine is about to stop, it is detected by the sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is energized. The magnetic core body sub-assembly 81 is attracted towards the rear yoke sleeve 2. At the same time, the spring III 8 pushes the valve core 7 towards the magnetic core body 6, causing displacement between the integrated valve sleeve 9 and the valve core 7. The oil fluid quickly enters the accumulator through the accumulator oil passage I 10 of the accumulator base 11, and the accumulator realizes fast charging;

[0044] Pressure holding state: After the vehicle stops running, the accumulator seals and stores the internal pressure through the solenoid valve. During the pressure holding process, the pressure acting on the valve core 7 causes the valve core 7 to seal with the integral valve sleeve 9. The steel ball 16 and the valve core hole 22 are sealed through the spring II 5 and the hydraulic pressure acting on the steel ball 16. Thus, the two sealing points achieve sealing, and the accumulator realizes pressure holding.

[0045] Oil discharging state: When the vehicle starts, to meet the demand for the pressure source of the transmission, after receiving the command, the solenoid valve is energized and opened. The magnetic core body sub-assembly 81 is attracted to the end of the rear yoke sleeve 2. The pressure at the small cavity 19 is quickly relieved through the valve core hole 22. Since the oil pressure in the accumulator oil passage II 12 of the accumulator base 11 cannot quickly compensate for the pressure of the small cavity 19, and the area of the side groove of the valve core is smaller than the area of the valve core hole 22, resulting in the inability to quickly supply pressure. Under the action of the hydraulic pressure spring III 8 on the small end face 91 of the valve core, the valve core 7 quickly moves towards the magnetic core body 6, prompting the opening of the sealing part between the valve core 7 and the integral valve sleeve 9, and the pressure is quickly released into the transmission actuator, and the accumulator realizes oil discharging.

[0046] The automobile hydraulic system solenoid valve structure and control method thereof of the present invention aim at the deficiencies in the prior art and propose an improved technical solution. The automobile hydraulic system solenoid valve structure can switch between a slow charging state, a fast charging state, a pressure maintaining state, and an oil discharge state. The solenoid valve structure of the automobile hydraulic system is in a slow charging state: when the vehicle is operating normally, the solenoid valve is not energized, and the oil enters the solenoid valve cavity through the accumulator oil circuit Ⅰ of the accumulator base, pushing the steel ball. The steel ball compresses the spring Ⅱ to cause the steel ball and the valve core hole to be displaced, and then enters the accumulator through the side groove of the valve core. At the same time, the oil generates liquid pressure on the end face of the valve core to seal the valve core 7 with the integrated valve sleeve, and the accumulator is slowly charged; the solenoid valve structure of the automobile hydraulic system is in a fast charging state: when the vehicle engine is about to stop, the sensor detects that the brake is about to be stepped on, the ECU transmits a signal to the solenoid valve, the solenoid valve is energized, the magnetic core sub-assembly is attracted in the direction of the rear yoke sleeve, and the spring Ⅲ pushes the valve core in the direction of the magnetic core body, the integrated valve sleeve and the valve core are displaced, and the oil quickly enters the accumulator oil circuit Ⅰ of the accumulator base, and the accumulator is quickly charged; the solenoid valve structure of the automobile hydraulic system is in a pressure maintaining state: when the vehicle stops running, the accumulator is filled with oil. The internal pressure is stored through the solenoid valve seal. During the pressure-maintaining process, the pressure acting on the valve core makes the valve core and the integrated valve sleeve seal. The steel ball and the valve core hole are sealed through the spring II and the hydraulic pressure acting on the steel ball. At this point, the two sealing points are sealed, and the accumulator maintains pressure. The automobile hydraulic system solenoid valve structure is in the oil discharge state: when the vehicle is started, in order to meet the pressure source demand of the transmission, the solenoid valve is powered on and opened after receiving the command, and the magnetic core subassembly is attracted to the rear yoke sleeve end, and the pressure in the small cavity is quickly released from the valve core hole. Since the oil pressure in the accumulator oil circuit II of the accumulator base cannot quickly compensate for the pressure of the small cavity, the area of ​​the side groove of the valve core is smaller than the area of ​​the valve core hole, resulting in the pressure cannot be quickly supplied. The oil pressure is established under the force of the hydraulic pressure spring III on the small end face of the valve core, and the valve core quickly moves toward the magnetic core body, prompting the valve core and the integrated valve sleeve to open the seal, and the pressure is quickly released into the transmission actuator, and the accumulator discharges oil. In this way, the control and state switching of the entire structure can be realized conveniently and reliably. The automobile hydraulic system solenoid valve structure and control method thereof described in the present invention can be connected to an accumulator of the automobile hydraulic system for use, thereby conveniently realizing the switching of the accumulator between a slow charging state, a fast charging state, a pressure maintaining state, and an oil discharge state, thereby meeting the use requirements of the accumulator.

[0047] The present invention is described exemplarily above in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A solenoid valve structure for an automotive hydraulic system, characterized in that: A steel ball (16), a spring II (5), and a spring seat (4) are sequentially installed inside the magnetic core assembly (81). A spring III (8), a valve core (7), a magnetic core assembly (81), a spring I (3), and a rear yoke sleeve (2) are sequentially installed inside the integral valve sleeve (9). An O-ring III (15) is installed in the installation groove on the outer ring of the rear yoke sleeve (2). The solenoid assembly (1) is installed inside the housing (17). The integral valve sleeve (9) is press-fitted onto the housing (17). An O-ring I (13) and an O-ring II (14) are respectively installed in a corresponding installation groove on the outer ring of the integral valve sleeve (9). The integral valve sleeve (9) of the automotive hydraulic system solenoid valve structure is connected to the accumulator base (11). The accumulator base (11) is provided with an accumulator oil passage I (10) and an accumulator oil passage II (12). A valve core side groove (21) is arranged along the axial position on the outer surface of the valve core (7). One or more valve core side grooves (21) are arranged along the outer surface of the valve core (7) for one week. The cross-sectional area of each valve core side groove (21) is set to be smaller than the cross-sectional area of the valve core hole (22).

2. The solenoid valve structure of the automotive hydraulic system according to claim 1, wherein: The steel ball (16) of the automotive hydraulic system solenoid valve structure is set to be able to move freely inside the magnetic core (6) and will not fall out of the magnetic core (6).

3. The solenoid valve structure of the automotive hydraulic system according to claim 2, characterized in that: A spring seat oil passage (41) is arranged on the side of the spring seat (4).

4. The solenoid valve structure of the automotive hydraulic system according to claim 3, characterized in that: The automotive hydraulic system solenoid valve structure is set to be able to switch between a slow charge state, a fast charge state, a pressure holding state, and an oil discharge state.

5. The solenoid valve structure of the automotive hydraulic system according to claim 4, characterized in that: The automotive hydraulic system solenoid valve structure is in the slow charge state: When the vehicle is running normally, the solenoid valve is not powered on. The oil fluid enters the solenoid valve cavity through the accumulator oil passage I (10) of the accumulator base (11), pushing the steel ball (16). The steel ball compresses the spring II (5) to cause a displacement of the steel ball (16) and the valve core hole (22), and then enters the accumulator through the valve core side groove (21). At the same time, the oil fluid generates a hydraulic pressure on the valve core end face (90) to seal the valve core (7) and the integral valve sleeve (9). The accumulator is set to be in a structure that realizes the slow charge state.

6. The solenoid valve structure of the automotive hydraulic system according to claim 4, wherein: The automotive hydraulic system solenoid valve structure is in the fast charge state: When the vehicle engine is about to stop, it is detected by the sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is powered on. The magnetic core assembly (81) is attracted towards the rear yoke sleeve (2). At the same time, the spring III (8) pushes the valve core (7) towards the magnetic core (6), causing a displacement between the integral valve sleeve (9) and the valve core (7). The oil fluid quickly enters from the accumulator oil passage I (10) of the accumulator base (11). The accumulator is set to be in a structure that realizes the fast charge state.

7. The solenoid valve structure of the automotive hydraulic system according to claim 4, characterized in that: The solenoid valve structure of the automotive hydraulic system is in the pressure-holding state: When the vehicle stops running, the accumulator seals and stores the internal pressure through the solenoid valve. During the pressure-holding process, the pressure acting on the valve core (7) causes the valve core (7) to seal with the integrated valve sleeve (9). The steel ball (16) and the valve core hole (22) are sealed through Spring II (5) and the hydraulic pressure acting on the steel ball (16). Thus, two sealing points are achieved, and the accumulator is configured to be in a structure for achieving the pressure-holding state.

8. The solenoid valve structure of the automotive hydraulic system according to claim 5, characterized in that: The solenoid valve structure of the automotive hydraulic system is in the oil-draining state: When the vehicle starts, to meet the pressure source requirements of the transmission, after receiving the command, the solenoid valve is energized and opened. The magnetic core body sub-assembly (81) is attracted towards the rear yoke sleeve (2). The pressure at the small cavity (19) is quickly relieved through the valve core hole (22). Since the oil pressure in the accumulator oil passage II (12) of the accumulator base (11) cannot quickly compensate for the pressure in the small cavity (19), and the area of the side groove of the valve core is smaller than the area of the valve core hole (22), resulting in the inability to quickly supply pressure. With the hydraulic pressure generated by the oil on the small end face (91) of the valve core and the force of Spring III (8), the valve core (7) quickly moves towards the magnetic core body (6), prompting the sealing point between the valve core (7) and the integrated valve sleeve (9) to open, and the pressure is quickly released into the transmission actuator. The accumulator is configured to be in a structure for achieving the oil-draining state.

9. The control method of the automotive hydraulic system solenoid valve structure according to any one of claims 1 to 8, characterized in that: The control method of the solenoid valve structure of the automotive hydraulic system includes a slow charging state, a fast charging state, a pressure-holding state, and an oil-draining state; Slow charging state: When the vehicle is running normally, the solenoid valve is not energized. The oil passes through the accumulator oil passage I (10) of the accumulator base (11) into the solenoid valve cavity, pushing the steel ball (16). The steel ball compresses Spring II (5) to displace the steel ball (16) and the valve core hole (22), and then enters the accumulator through the side groove (21) of the valve core. At the same time, the hydraulic pressure generated by the oil on the end face (90) of the valve core causes the valve core (7) to seal with the integrated valve sleeve (9), and the accumulator achieves slow charging; Fast charging state: When the vehicle engine is about to shut down, it is detected by the sensor that the brake is about to be stepped on. The ECU transmits a signal to the solenoid valve, and the solenoid valve is energized. The magnetic core body sub-assembly (81) is attracted towards the rear yoke sleeve (2) direction. At the same time, Spring III (8) pushes the valve core (7) towards the magnetic core body (6) direction. The integrated valve sleeve (9) and the valve core (7) are displaced, and the oil quickly enters the accumulator through the accumulator oil passage I (10) of the accumulator base (11), and the accumulator achieves fast charging; Pressure-holding state: When the vehicle stops running, the accumulator seals and stores the internal pressure through the solenoid valve. During the pressure-holding process, the pressure acting on the valve core (7) causes the valve core (7) to seal with the integrated valve sleeve (9). The steel ball (16) and the valve core hole (22) are sealed through Spring II (5) and the hydraulic pressure acting on the steel ball (16). Thus, two sealing points are achieved, and the accumulator achieves pressure-holding; Drain oil state: When the vehicle starts, to meet the demand of the transmission pressure source, after receiving the command, the solenoid valve is energized and opened. The magnetic core body subassembly (81) is attracted towards the end of the rear yoke sleeve (2). The pressure at the small cavity (19) is quickly relieved from the valve core hole (22). Since the oil pressure in the accumulator oil circuit II (12) of the accumulator base (11) cannot quickly compensate for the pressure of the small cavity (19), and the area of the side groove of the valve core is smaller than the area of the valve core hole (22), resulting in the inability to quickly supply pressure. Under the action of the force of the hydraulic pressure spring III (8) on the small end face (91) of the valve core, the valve core (7) quickly moves towards the magnetic core body (6), prompting the opening of the sealing part between the valve core (7) and the integrated valve sleeve (9). The pressure is quickly released into the transmission actuator, and the accumulator realizes oil drainage.

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