High-pressure pump for automobile and pressure self-adaptive adjusting method of high-pressure pump

Abstract

The invention relates to the technical field of automobile accessories, in particular to a high-pressure pump for an automobile and a pressure self-adaptive adjusting method of the high-pressure pump. A piston cavity, a piston, an oil inlet channel containing an inlet controller, an oil discharge channel containing an oil discharge valve, a distribution cavity containing a discharge port connector, an oil distributor and a thrust bearing, an oil return channel containing a pressure relief valve, a pressure relief oil channel, a connecting oil channel and a sliding sleeve cavity are arranged in the pump body. An extension rod is coaxially arranged at the lower end of the piston and is kept at the lowermost position through an outer spring frame, an outer spring seat and an outer spring; the pressure relief oil duct is communicated with the oil return duct and an inner cavity of the pump cover; the connecting oil duct is communicated with the inner cavity of the pump cover and the sliding sleeve cavity; the pressure self-adaptive adjusting method comprises the steps of oil inlet, compression oil discharge, overpressure oil drainage and pressure self-adaptive adjustment. According to the high-pressure pump for the automobile and the pressure self-adaptive adjusting method of the high-pressure pump, self-adaptive adjustment of the fuel pressure is conducted in real time; and the device is suitable for engines under various fuel pressure working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile accessories, in particular to a high-pressure pump for an automobile and a pressure adaptive regulation method thereof. Background Art The fuel pump is the core component of the internal combustion engine fuel supply system. Its development has undergone an evolution from mechanical to electronic control and from low pressure to high pressure to meet the needs of different fuel injection technologies.

[0002] The fuel pump in the early engine provided low pressure, and its function was to transport fuel from the fuel tank to the carburetor; in the early stage, the mechanical diaphragm fuel pump was driven by the engine camshaft to perform reciprocating motion to suck and pump oil; later, with the emergence of electronic fuel injection technology, the mechanical pump was replaced by an electric low-pressure fuel pump installed in the fuel tank.

[0003] As engine technology develops towards direct injection and common rail diesel, traditional low-pressure fuel pumps are unable to meet the demand, and high-pressure fuel pumps have come into being; gasoline is injected directly into the cylinder at high pressure to achieve better atomization effect and combustion efficiency; diesel is supplied to the high-pressure rail, and the diesel at constant pressure in the high-pressure rail is supplied to the engine through the high-pressure common rail system.

[0004] Currently, there are two ways to adjust high-pressure fuel pumps: software control, which uses the vehicle's computer control module to adjust the high-pressure fuel pump to ensure fuel compression pressure. Hardware control, which optimizes fuel supply efficiency by changing the piston stroke or the opening and closing interval of the fuel inlet valve. A multi-piston structure reduces pressure pulsation and improves fuel supply stability.

[0005] Conventional high-pressure pumps use pressure signal data to adjust the pump's speed and piston stroke, thereby regulating the oil supply pressure. For universality, this is often achieved through the use of different check components. However, in actual operating conditions, data collection is often inefficient, the control signal's achievement rate is low, and adjusting the oil supply pressure by replacing check components is costly. Summary of the Invention

[0006] In order to solve the technical problems existing in the background technology, the present invention provides a high-pressure pump for automobile and a pressure adaptive regulation method thereof, which can perform real-time adaptive regulation of fuel pressure and adapt to engines with various fuel pressure working conditions.

[0007] The technical solution adopted by the present invention is: A high-pressure pump for an automobile, comprising: The pump body and pump cover are sealed and connected to each other. The center of the pump body is open downwardly and a piston cavity is provided. A piston is inserted in the piston cavity. The lower end of the piston is coaxially provided with an extension rod connected to the cam plate. The lower end of the pump body is provided with an outer spring frame. The lower part of the extension rod is fixedly provided with an outer spring seat. An outer spring is abutted between the outer spring frame and the outer spring seat. The upper part of the piston cavity is connected to an oil inlet channel and an oil discharge channel extending to the outside of the side wall of the pump body respectively. The oil inlet channel and the oil discharge channel are arranged opposite to each other and perpendicular to the piston cavity. An inlet controller is sealed at the oil inlet channel, and an oil discharge valve is sealed in the oil discharge channel.

[0008] An oil return channel is provided in the pump body above the oil discharge channel, and a pressure relief valve is provided in the oil return channel in the opposite direction of the oil discharge valve. A distribution chamber connected to the oil discharge channel and the oil return channel is provided on the outside of the side wall of the pump body. The distribution chamber extends to the outside of the side wall of the pump body and is sealed and connected with a discharge port joint. An oil separator is provided in the distribution chamber, which is respectively in contact with the oil discharge valve and the pressure relief valve, and a thrust bearing is provided in contact between the oil separator and the discharge port joint.

[0009] Furthermore, a buffer is provided inside the pump cover.

[0010] An upwardly open pressure relief oil passage is provided on the pump body at the end of the oil return passage, and the pressure relief oil passage is communicated with the chamber where the buffer is located.

[0011] Furthermore, the pressure relief oil passage is spaced apart and arranged just above the piston cavity.

[0012] Furthermore, the pressure relief oil channel is configured in a frustum shape that is larger at the top and smaller at the bottom.

[0013] Furthermore, a groove for clamping a pressure relief valve is provided on the side wall of the pressure relief oil passage opposite to the oil return passage.

[0014] Furthermore, a sliding sleeve cavity is provided on the side wall of the piston cavity along its radial inward concave direction, a sliding sleeve is provided in the sliding sleeve cavity for sealing and sliding, the sliding sleeve is sealed and sleeved on the outside of the piston, a return spring is provided between the sliding sleeve cavity and the sliding sleeve, and the sliding sleeve is kept at the lower part of the sliding sleeve cavity.

[0015] Furthermore, the upper end of the sliding sleeve is open upward and is provided with an annular groove for accommodating a reset spring.

[0016] Furthermore, a connecting oil passage is provided in the pump body, and two ends of the connecting oil passage are respectively located on the upper end surface of the pump body and the lower part of the sliding sleeve cavity.

[0017] A method for adaptively regulating pressure of a high-pressure pump for an automobile, comprising: A. Oil inlet: The piston moves downward and draws fuel into the piston chamber.

[0018] B. Compression oil discharge: The piston moves upward and compresses the fuel until the pressure pushes open the drain valve, allowing the compressed fuel to be discharged from the drain connector.

[0019] C. Overpressure oil leakage: When the oil pressure reaches the drain pressure, the pressure relief valve will be pushed open and the compressed fuel will be discharged into the pump cover.

[0020] D. Pressure adaptive adjustment: The oil pressure reaches the drain pressure and is supplied to the lower part of the sliding sleeve cavity through the connecting oil channel, and is balanced with the thrust of the return spring, thereby adjusting the position of the sliding sleeve in the sliding sleeve cavity, changing the volume of the piston cavity, adjusting the compressed fuel volume, and regulating the fuel compression pressure.

[0021] Furthermore, the step B, compressing and draining the oil, further comprises: By changing the axial length of the two protruding rods on the oil distributor, the compression stroke of the oil drain valve and the pressure relief valve is adjusted, thereby calibrating the oil supply pressure and the oil discharge pressure.

[0022] The beneficial effects of the automobile high-pressure pump of the present invention are as follows: 1. Depressurized fuel is supplied to the sleeve cavity through the connecting oil channel, balancing the thrust of the return spring, thereby changing the position of the sleeve and the volume of the piston cavity; the oil supply pressure is adaptively adjusted in real time; 2. By changing the axial length of the protruding rod on the oil distributor, the compression stroke of the oil drain valve and the pressure relief valve can be adjusted to calibrate the oil supply pressure and oil drain pressure; it is suitable for engines with various fuel pressure conditions and improves versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a front cross-section of an embodiment of the present invention; Figure 2 It is a schematic front view cross-sectional view of the assembled state of an example of the present invention.

[0024] Figure 3 This is an example of the present invention Figure 2 Schematic cross-section of the middle AA; Figure 4 This is an example of the present invention Figure 2 Schematic cross-section of the BB.

[0025] In the picture: 10. Pump body, 110. Piston chamber, 111. Oil inlet passage, 112. Oil discharge passage, 113. Distribution chamber, 114. Oil return passage, 115, pressure relief oil passage, 12, piston, 13, extension rod, 14, outer spring frame, 15, outer spring seat, 16, outer spring, 17. Oil drain valve, 18. Pressure relief valve, 19. Sleeve cavity, 20. Pump cover, 21. Buffer, 30. Discharge port joint, 31. Oil separator, 32. Thrust bearing, 40. Sliding sleeve, 41. Return spring, 50. Connect the oil channel. 60. Imported controller. DETAILED DESCRIPTION

[0026] In order to more clearly and specifically illustrate the specific implementation objectives and implementation methods of the present invention, the following is a complete description of the technical solution of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them. Without creative work, all other embodiments based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0027] The present invention provides a high-pressure pump for automobiles, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, including: The pump cover 20 and the pump body 10 are sealed and connected to each other in the up-down direction.

[0028] The pump cover 20 is provided with a buffer 21 therein.

[0029] The pump body 10 is provided with a piston cavity 110 in the center which is open downward, and a sleeve cavity 19 is provided on the side wall of the piston cavity 110 along its radial inward concave direction, and a sleeve 40 is provided in the sleeve cavity 19 for sealing and sliding. The upper end of the sleeve 40 is open upward and an annular groove is provided, and a return spring 41 is provided in the groove. The upper and lower ends of the return spring 41 are respectively in contact with the upper end of the sleeve cavity 19 and the bottom of the groove, and the sleeve 40 is maintained at the lower part of the sleeve cavity 19. A piston 12 is inserted in the sleeve 40 for sealing and sliding, and an extension rod 13 connected to the cam disc transmission is coaxially provided at the lower end of the piston 12; a connecting oil channel 50 is provided in the pump body 10, and the two ends of the connecting oil channel 50 are respectively located on the upper end surface of the pump body 10 , the lower part of the sliding sleeve cavity 19; an outer spring frame 14 is provided at the lower end of the piston cavity 110, and an outer spring seat 15 is fixedly provided at the lower part of the extension rod 13, and an outer spring 16 is abutted between the outer spring frame 14 and the outer spring seat 15; the piston cavity 110 and the upper part of the piston cavity 110 are connected with an oil inlet passage 111 and an oil discharge passage 112 which extend to the outside of the side wall of the pump body 10 respectively, and the oil inlet passage 111 and the oil discharge passage 112 are arranged opposite to each other and perpendicular to the piston cavity 110; an inlet controller 60 electrically connected to the oil supply system is sealed at the oil inlet passage 111, and an oil discharge valve 17 is sealed in the oil discharge passage 112, and the oil discharge valve 17 is arranged to communicate from the piston cavity 110 to the oil discharge passage 112, and vice versa.

[0030] An oil return passage 114 is provided in the pump body 10 above the oil discharge passage 112, and a pressure relief valve 18 is provided in the oil return passage 114 in the opposite direction of the oil discharge valve 17; an upwardly open pressure relief passage 115 is provided on the pump body 10 at the end of the oil return passage 114, and the pressure relief passage 115 is arranged in a cone shape with a larger upper portion and a smaller lower portion. The pressure relief passage 115 is connected to the chamber where the buffer 21 is located, and the pressure relief passage 115 is arranged at intervals just above the piston chamber 110, and a groove for clamping the pressure relief valve 18 is provided on the side wall of the pressure relief passage 115 on the opposite side of the oil return passage 114; a distribution chamber 113 connected to the oil discharge passage 112 and the oil return passage 114 is provided on the outside of the side wall of the pump body 10, and a limiting portion 1 is provided on the side wall of the distribution chamber 113, and the distribution chamber 113 extends to the pump The outside of the side wall of the body 10 is sealed and connected with a drain joint 30. The distribution chamber 113 is provided with an oil separator 31 which is respectively in contact with the oil drain valve 17 and the pressure relief valve 18. A thrust bearing 32 is provided between the oil separator 31 and the drain joint 30. The oil separator 31 is arranged in a circular ring shape, and a limit portion 2 which is engaged with the limit portion 1 is provided on the side wall of the oil separator 31. A convex rod is protruded from one end of the oil separator 31 facing the oil drain channel 112 and the oil return channel 114. There are two convex rods, which are respectively inserted into the oil drain channel 112 and the oil return channel 114 and respectively in contact with the oil drain valve 17 and the pressure relief valve 18. An oil flow channel is provided in the center of the convex rod in contact with the oil drain valve 17, and the other end of the oil flow channel extends to the annular inner wall of the oil separator 31.

[0031] Based on the specific structure of a high-pressure pump for an automobile in the above embodiment, a pressure adaptive adjustment method for a high-pressure pump for an automobile is further described below: A. Oil inlet: The cam plate moves away from the lower end of the extension rod 13, and under the action of the elastic force of the external spring 16, the piston 12 moves downward; at the same time, the solenoid valve in the inlet controller 60 opens and is connected to the low-pressure oil circuit; at this time, the fuel in the low-pressure oil circuit is drawn into the piston chamber 110; the solenoid valve in the inlet controller 60 is closed.

[0032] B. Compression oil discharge: The cam plate is close to the lower end of the extension rod 13 and pushes the extension rod 13 upward, so that the extension rod 13 drives the piston 12 to move upward and compresses the fuel in the piston chamber 110 until the pressure pushes open the oil drain valve 17. The compressed fuel passes through the piston chamber 110, the oil drain valve 17 in the oil drain channel 112, the oil separator 31 and the thrust bearing 32 in the distribution chamber 113 in sequence, and is discharged from the discharge port joint 30 and supplied to the high-pressure oil rail.

[0033] By changing the axial lengths of the two protruding rods provided on the oil separator 31, the compression strokes of the oil discharge valve 17 and the pressure relief valve 18 are adjusted, thereby calibrating the oil supply pressure and the oil relief pressure.

[0034] C. Overpressure oil leakage: When the oil pressure in the high-pressure oil rail reaches the oil relief pressure, the pressure relief valve 18 will be pushed open, and the compressed fuel will pass through the pressure relief valve 18 and the pressure relief oil passage 115 in the oil return passage 114 and into the pump cover 20.

[0035] D. Pressure adaptive adjustment: The fuel in the pump cover 20 passes through the buffer 21 in the pump cover 20 and the connecting oil channel 50 in turn, and reaches the lower part of the sleeve cavity 19, and is balanced with the thrust of the return spring 41, thereby adjusting the position of the sleeve 40 in the sleeve cavity 19, thereby changing the volume of the piston cavity 110; at this time, while the stroke of the piston 12 remains unchanged, the amount of compressed fuel is adjusted to achieve the adjustment of the compression pressure of the fuel amount.

[0036] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the contents of the specification. All so-called equivalent changes and modifications of the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A high-pressure pump for an automobile, comprising: A pump body (10) and a pump cover (20) are sealed and connected to each other. The center of the pump body (10) is open downwardly and is provided with a piston cavity (110). A piston (12) is inserted into the piston cavity (110). The lower end of the piston (12) is coaxially provided with an extension rod (13) connected to the cam plate. The lower end of the pump body (10) is provided with an outer spring frame (14). The lower part of the extension rod (13) is fixedly provided with an outer spring seat (15). The outer spring frame (14) and the outer spring seat (15) are fixedly provided. An external spring (16) is disposed between the spring seats (15), and an oil inlet passage (111) and an oil discharge passage (112) are disposed in communication with the upper portion of the piston chamber (110), each extending to the outside of the side wall of the pump body (10). The oil inlet passage (111) and the oil discharge passage (112) are disposed opposite to each other and perpendicular to the piston chamber (110). An inlet controller (60) is sealed at the oil inlet passage (111), and an oil discharge valve (17) is sealed in the oil discharge passage (112). The invention is characterized in that: An oil return passage (114) is provided in the pump body (10) above the oil discharge passage (112). A pressure relief valve (18) is provided in the oil return passage (114) in a direction opposite to the oil discharge valve (17). A distribution chamber (113) communicating with the oil discharge passage (112) and the oil return passage (114) is provided on the outer side wall of the pump body (10). The distribution chamber (113) extends to the outside of the side wall of the pump body (10) and is provided with a discharge port joint (30) in a sealed connection. An oil separator (31) is provided in the distribution chamber (113) and is respectively abutted against the oil discharge valve (17) and the pressure relief valve (18). A thrust bearing (32) is provided abutting against the oil separator (31) and the discharge port joint (30).

2. The high-pressure pump for automobile according to claim 1, characterized in that: The pump cover (20) is provided with a buffer (21); An upwardly open pressure relief oil passage (115) is provided on the pump body (10) at the end of the oil return passage (114), and the pressure relief oil passage (115) is communicated with the chamber where the buffer (21) is located.

3. The high-pressure pump for automobile according to claim 2, characterized in that: The pressure relief oil passage (115) is spaced apart and arranged just above the piston chamber (110).

4. The automobile high-pressure pump according to claim 2, characterized in that: The pressure relief oil passage (115) is configured in a cone shape that is larger at the top and smaller at the bottom.

5. The automobile high-pressure pump according to claim 2, characterized in that: A clamping groove for clamping a pressure relief valve (18) is provided on the side wall of the pressure relief oil passage (115) on the opposite side of the oil return passage (114).

6. A high-pressure pump for an automobile according to any one of claims 2 to 5, characterized in that: A sliding sleeve cavity (19) is provided on the side wall of the piston cavity (110) in a radially inwardly concave manner. A sliding sleeve (40) is provided in the sliding sleeve cavity (19) in a sealed and sliding manner. The sliding sleeve (40) is sealed and sleeved on the outside of the piston (12). A return spring (41) is provided between the sliding sleeve cavity (19) and the sliding sleeve (40) to keep the sliding sleeve (40) at the lower part of the sliding sleeve cavity (19).

7. The automobile high-pressure pump according to claim 6, characterized in that: The upper end of the sliding sleeve (40) is open upwards and is provided with an annular groove for accommodating a return spring (41).

8. The automobile high-pressure pump according to claim 6, characterized in that: A connecting oil passage (50) is provided in the pump body (10), and two ends of the connecting oil passage (50) are respectively located on the upper end surface of the pump body (10) and the lower part of the sliding sleeve cavity (19).

9. A method for adaptively regulating pressure of a high-pressure pump for an automobile, according to the high-pressure pump for an automobile as claimed in claim 8, characterized in that: A. Oil inlet: The piston (12) moves downward and draws fuel into the piston chamber (110); B. Compression oil discharge: The piston (12) moves upward and compresses the fuel until the pressure pushes open the oil discharge valve (17), allowing the compressed fuel to be discharged from the discharge port connector (30); C. Overpressure oil leakage: When the oil pressure reaches the oil drain pressure, the pressure relief valve (18) will be pushed open, and the compressed fuel will be discharged into the pump cover (20); D. Pressure adaptive adjustment: When the oil pressure reaches the drain pressure, it is supplied to the lower part of the sleeve cavity (19) through the connecting oil passage (50) and is balanced with the thrust of the return spring (41), thereby adjusting the position of the sleeve (40) in the sleeve cavity (19), changing the volume of the piston cavity (110), adjusting the amount of compressed fuel, and regulating the pressure of the compressed fuel.

10. The method for adaptively adjusting pressure of a high-pressure pump for an automobile according to claim 9, characterized in that: The step B, compressing and draining the oil, further comprises: By changing the axial lengths of the two protruding rods provided on the oil distributor (31), the compression strokes of the oil discharge valve (17) and the pressure relief valve (18) are adjusted, thereby calibrating the oil supply pressure and the oil relief pressure.

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