A dual-source electric steering pump switching control system and its steering pump

Abstract

This invention relates to the field of automotive power steering pump technology, specifically to a dual-source electric power steering pump switching control system and its power steering pump. The system includes a motor housing and a stator winding fixed inside and within the motor housing. The stator winding consists of a high-voltage winding and a low-voltage winding, which operate independently. When the vehicle's high-voltage power supply fails, the stator winding switches from high-voltage to low-voltage operation. This dual-source electric power steering pump switching control system, combined with the single-motor, dual-winding design of the dual-source electric power steering pump, enables switching to the low-voltage winding when the vehicle's high-voltage power supply fails. This drives the power steering pump to provide degraded but safe power steering assistance, achieving a "limp-home" function, preventing the vehicle's steering wheel from completely losing power assist, facilitating parking, and improving safety redundancy.

Description

Technical Field

[0001] This invention relates to the field of automotive steering pump technology, specifically to a dual-source electric steering pump switching control system and its steering pump. Background Technology

[0002] With the popularization of new energy vehicles, the traditional mechanical hydraulic power steering pump driven by the engine belt has been replaced by the electric power steering pump. The electric power steering pump in the existing technology is usually driven by a high-voltage motor, which is directly connected to the vehicle's high-voltage power supply. Although this design is efficient, it has the risk of single point of failure: once the high-voltage power supply fails due to collision, fuse blown, controller failure or other reasons, the power steering will be completely lost instantly, which poses a great safety threat to the vehicle at high speed. Existing technology has a dual-motor solution with a low-voltage motor to assist the high-voltage motor, which works with a clutch and gears to achieve drive switching. However, it has the defects of large mechanical transmission loss and slow response speed. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-source electric power steering pump switching control system and its steering pump to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dual-source electric power steering pump, comprising a motor housing and a stator winding fixed inside and to the motor housing, wherein the stator winding consists of a high-voltage winding and a low-voltage winding, which are independent of each other; when the vehicle's high-voltage power supply fails, the stator winding switches from the high-voltage winding to the low-voltage winding for operation; it also includes a rotor driven by the stator winding, wherein a motor shaft is inserted at the center of the rotor, and a power steering pump is fixedly installed outside the motor housing, with the motor shaft drivingly connected to the power steering pump; the motor shaft is a hollow shaft, and an inertia sub-shaft is provided inside the motor shaft for radial support of the motor shaft; when the high-voltage winding is working, the motor shaft and the inertia sub-shaft are relatively stationary, and when the low-voltage winding is working, the inertia sub-shaft can rotate relative to the motor shaft.

[0005] An eccentric blind hole is provided at the end of the inertia sub-shaft. The eccentric blind hole is eccentrically positioned. A locking pin capable of telescopic movement is provided in the motor shaft. When the locking pin is inserted into the eccentric blind hole, the motor shaft and the inertia sub-shaft can be locked relative to each other. When the locking pin is pulled out of the eccentric blind hole, the inertia sub-shaft can rotate relative to the motor shaft.

[0006] The motor shaft has a control groove inside, and a protruding ring is provided in the control groove. The locking pin is fixedly connected to the protruding ring. One end of the control groove is open, and the other end has an alignment hole. The locking pin is inserted into the alignment hole.

[0007] An end pressure ring is detachably installed at the end of the motor shaft. A retaining spring is provided between the end pressure ring and the convex ring. The retaining spring applies pressure to the convex ring, causing the locking pin to tend to move into the eccentric blind hole.

[0008] A synchronous coupling is fixedly installed on the side of the convex ring away from the locking pin. A control back plate is fixedly installed at the end of the synchronous coupling. A protective cover is fixedly installed inside the motor housing. A first electromagnet is fixedly installed inside the protective cover. When the first electromagnet is energized, it can generate magnetic force to attract and drive the control back plate, so that the convex ring overcomes the elastic force of the retaining spring and drives the locking pin to be pulled out of the eccentric blind hole.

[0009] A sidewall groove is provided on the sidewall of the control circular groove, and a spring strip is provided in the sidewall groove. One end of the spring strip is fixed to the inner wall of the sidewall groove, and the other end is provided with a limit lock head. When the locking pin is completely pulled out from the eccentric blind hole, the limit lock head will be stuck on one side of the convex ring, so that the convex ring cannot be reset and moved.

[0010] The locking pin has a conical head at its end. The surface of the protective cover has a through-hole groove. A limiting plate is inserted in the groove. The limiting plate is covered by a telescopic rotating cover. The limiting plate can be extended and retracted relative to the telescopic rotating cover. When the limiting plate extends, it can limit the control back plate. At this time, the first electromagnet is energized to attract the control back plate to move, so that the conical head moves just between the eccentric blind hole and the alignment hole.

[0011] The surface of the telescopic rotating cover is provided with a movable groove. A lead screw connection part is fixedly provided on the limiting plate. The lead screw connection part passes through the movable groove and extends to the outside of the telescopic rotating cover. A control lead screw is screwed in the lead screw connection part. The rotation of the control lead screw can drive the lead screw connection part to move the limiting plate to adjust its extension and retraction. A control motor for driving the rotation of the control lead screw is provided at the end of the control lead screw.

[0012] The telescopic rotating cover is provided with a fulcrum frame on its exterior, and the telescopic rotating cover can rotate with the fulcrum frame as the fulcrum. An extension magnetic arm is fixedly provided on the telescopic rotating cover. A fixed frame is fixedly provided inside the motor housing. A tension spring and a second electromagnet are provided in the fixed frame. The tension spring applies an elastic tension to the extension magnetic arm. When the second electromagnet is energized, it can attract the extension magnetic arm to overcome the elastic tension of the tension spring and rotate.

[0013] A dual-source electric power steering pump switching control system, the system comprising a dual-source electric power steering pump, a low-pressure controller and an electronic control unit;

[0014] The low-voltage controller is electrically connected to the low-voltage winding and drives and controls the low-voltage winding; the electronic control unit controls the high-voltage winding to be energized and operated.

[0015] The electronic control unit (ECU) determines whether the high-voltage power supply is faulty by monitoring the voltage signal of the vehicle's high-voltage circuit. When the ECU detects a fault in the vehicle's high-voltage power supply, it cuts off the power supply to the high-voltage winding and sends a start command to the low-voltage controller. The low-voltage controller then drives the low-voltage winding to work according to the received command.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention relates to a dual-source electric power steering pump switching control system. Combined with a single-motor, dual-winding design for the dual-source electric power steering pump, it can switch to low-voltage winding operation when the vehicle's high-voltage power supply fails. This drives the steering pump to provide degraded but safe power steering assistance, achieving a "limp-home" function. This prevents the vehicle's steering wheel from completely losing power steering, facilitating parking and improving safety redundancy. Compared to existing technologies that use clutches or gears to drive dual motors, this invention's switching from high-voltage to low-voltage windings is purely electrical, resulting in a fast response time.

[0018] This invention relates to a dual-source electric power steering pump. Under normal operating conditions, when the high-voltage winding is working, the inertia shaft is relatively stationary with respect to the motor shaft. This allows the inertia shaft to provide radial support to the motor shaft, ensuring sufficient support strength. Under vehicle bumps and impacts, the motor shaft is less prone to fatigue deformation, improving durability. At the same time, the relative stationary position of the two components prevents wear-induced gap increases and loss of support. When the vehicle's high-voltage power supply fails and switches to low-voltage winding operation, the inertia shaft can rotate relative to the motor shaft. This reduces the rotational inertia of the motor shaft and rotor, improving the forward and reverse rotation and start-stop response speed of the power steering pump motor when the low-voltage driving force is weak.

[0019] By using a combination of a cone head, a limiting plate, and an extended magnetic arm, the cone head can be periodically controlled to remain between the eccentric blind hole and the alignment hole for a certain period of time. Due to the cone head's tapered design, when the cone head is between the eccentric blind hole and the alignment hole, the inertia shaft can rotate a certain angle relative to the motor shaft. This periodic movement prevents the lubricant between the inertia shaft and the motor shaft from solidifying and failing. At the same time, the limiting plate provides pressure to work with the cone head to reset, allowing the inertia shaft and the motor shaft to return to their initial locked state. Attached Figure Description

[0020] Figure 1 This is a front view of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the removal of the back-end shell according to the present invention.

[0022] Figure 3 This is a three-dimensional half-section diagram of the present invention at a horizontal angle.

[0023] Figure 4 This is a horizontal angle three-dimensional half-section top view of the present invention.

[0024] Figure 5 This is a three-dimensional half-section top view of the protective cover of the present invention.

[0025] Figure 6 This is a schematic diagram of the motor shaft structure of the present invention.

[0026] Figure 7 This is a three-dimensional half-sectional schematic diagram of the motor shaft of the present invention.

[0027] Figure 8 This is a half-sectional schematic diagram of the protective cover of the present invention.

[0028] In the diagram: 1. Motor housing; 2. Stator winding; 3. Rotor; 4. Steering pump; 5. Motor shaft; 6. Inertia shaft; 7. Eccentric blind hole; 8. Locking pin; 9. Conical head; 801. Control groove; 802. Protruding ring; 803. Alignment hole; 804. End pressure ring; 805. Holding spring; 806. Synchronous coupling; 807. Control back plate; 808. Protective cover; 809. First electromagnet; 810. Side wall groove; 811. Spring 812. Limit lock head; 901. Outer cover groove; 902. Limit plate; 903. Telescopic rotating cover; 904. Movable groove; 905. Lead screw connection part; 906. Control lead screw; 907. Control motor; 908. Support frame; 909. Extension magnetic arm; 910. Fixed frame; 911. Tension spring; 912. Second electromagnet; 101. Rear end shell; 501. Axial keyway; 502. Reset end hole; 601. Internal hexagonal slot. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 8The present invention provides a technical solution: a dual-source electric steering pump, including a motor housing 1 and a stator winding 2 fixed inside the motor housing 1. The motor housing 1 is made of aluminum alloy and has heat dissipation fins on its surface. The stator winding 2 consists of a high-voltage winding and a low-voltage winding. The high-voltage winding and the low-voltage winding are independent of each other. The rated voltage of the high-voltage winding is 800V DC, the rated power is 5kW, and it has many turns and a thin wire diameter.

[0031] The low-voltage winding has a rated voltage of 24V DC and a maximum output power of 2.5kW. It has fewer turns and thicker wire. When the vehicle's high-voltage power supply fails, stator winding 2 switches from the high-voltage winding to the low-voltage winding to operate.

[0032] It also includes a rotor 3 driven by stator winding 2. Rotor 3 is a permanent magnet rotor. The high-voltage winding and the low-voltage winding are completely isolated in physical space and electrical insulation, sharing the same rotor 3 and magnetic circuit.

[0033] A motor shaft 5 is inserted at the center of rotor 3, such as Figure 6 As shown, an axial keyway 501 is provided on the surface of the motor shaft 5. The axial keyway 501 is arranged parallel to the axial direction of the motor shaft 5. When the rotor 3 is installed with the motor shaft 5, the rotor 3 achieves rotational transmission by being limited by the axial keyway 501. A steering pump 4 is fixedly installed on the outside of the motor housing 1. The motor shaft 5 is drivenly connected to the steering pump 4.

[0034] The motor shaft 5 is a hollow shaft, and an inertia branch shaft 6 is provided inside the motor shaft 5 to provide radial support for the motor shaft 5; for example Figure 7 As shown, a reset end hole 502 is provided through the end of the motor shaft 5, and an internal hexagonal slot 601 is provided at the end of the inertia sub-shaft 6. By inserting an internal hexagonal wrench through the reset end hole 502 into the internal hexagonal slot 601, the inertia sub-shaft 6 can be rotated, thus allowing the inertia sub-shaft 6 in the motor shaft 5 to be rotated from the outside, facilitating structural reset during subsequent maintenance. In actual products, the reset end hole 502 can be normally closed by sealing it with a rubber plug, which is only removed during maintenance, thereby preventing the lubricating grease between the motor shaft 5 and the inertia sub-shaft 6 from oxidizing too quickly due to prolonged contact with air. When the high-voltage winding is working, the motor shaft 5 and the inertia sub-shaft 6 are relatively stationary; when the low-voltage winding is working, the inertia sub-shaft 6 can rotate relative to the motor shaft 5.

[0035] An eccentric blind hole 7 is provided at the end of the moment of inertia shaft 6. The eccentric blind hole 7 is eccentrically set, that is, the eccentric blind hole 7 and the moment of inertia shaft 6 are not coaxial. A locking pin 8 that can extend and retract is provided in the motor shaft 5. When the locking pin 8 is inserted into the eccentric blind hole 7, the motor shaft 5 and the moment of inertia shaft 6 can be locked relative to each other. When the locking pin 8 is pulled out from the eccentric blind hole 7, the moment of inertia shaft 6 can rotate relative to the motor shaft 5.

[0036] The motor shaft 5 has a control groove 801 inside, and a protruding ring 802 is provided in the control groove 801. The locking pin 8 is fixedly connected to the protruding ring 802. One end of the control groove 801 is open, and the other end has an alignment hole 803. The locking pin 8 is inserted into the alignment hole 803.

[0037] An end pressure ring 804 is detachably mounted on the end of the motor shaft 5. The end pressure ring 804 is fixed to the end of the motor shaft 5 by screws. The end pressure ring 804 can be separated by removing the screws. A retaining spring 805 is provided between the end pressure ring 804 and the convex ring portion 802. The retaining spring 805 applies pressure to the convex ring portion 802, causing the locking pin 8 to tend to move into the eccentric blind hole 7. A synchronous coupling 806 is fixedly provided on the side of the convex ring portion 802 away from the locking pin 8. A control back plate 807 is fixedly provided at the end of the synchronous coupling 806. A protective cover 808 is fixedly provided inside the motor housing 1. A first electromagnet 809 is fixedly provided inside the protective cover 808. When the first electromagnet 809 is energized, it can generate magnetic force to attract and drive the control back plate 807, causing the convex ring portion 802 to overcome the elastic force of the retaining spring 805 and pull the locking pin 8 out of the eccentric blind hole 7.

[0038] A sidewall groove 810 is provided on the sidewall of the control groove 801. A spring strip 811 is provided in the sidewall groove 810. One end of the spring strip 811 is fixed to the inner wall of the sidewall groove 810, and the other end is provided with a limit lock head 812. When the locking pin 8 is completely pulled out from the eccentric blind hole 7, the limit lock head 812 will be stuck on one side of the convex ring 802, so that the convex ring 802 cannot be reset and moved. The limit lock head 812 will be stuck on the left side of the convex ring 802 only when the locking pin 8 is completely pulled out from the eccentric blind hole 7. This is achieved by setting the structural length.

[0039] The locking pin 8 has a tapered head 9 at its end, such as... Figure 5 As shown, the cone head 9 and the locking pin 8 are integrally formed. The cone head 9 is cone-shaped. The surface of the protective cover 808 is provided with an outer cover groove 901. A limiting plate 902 is inserted in the outer cover groove 901. A telescopic rotating cover 903 is provided outside the limiting plate 902. The limiting plate 902 can be telescopically adjusted relative to the telescopic rotating cover 903. When the limiting plate 902 is extended, it can limit the control back plate 807. At this time, the first electromagnet 809 is energized to attract the control back plate 807 to move, so that the cone head 9 moves just between the eccentric blind hole 7 and the alignment hole 803.

[0040] A movable groove 904 is provided through the surface of the telescopic rotating cover 903. A screw connection part 905 is fixedly provided on the limiting plate 902. The screw connection part 905 passes through the movable groove 904 and extends to the outside of the telescopic rotating cover 903. A control screw 906 is screwed in the screw connection part 905. The rotation of the control screw 906 can drive the screw connection part 905 to drive the limiting plate 902 to extend and retract. A control motor 907 is provided at the end of the control screw 906 to drive the rotation of the control screw 906.

[0041] The telescopic rotating cover 903 is provided with a fulcrum frame 908 on its exterior. The telescopic rotating cover 903 can rotate with the fulcrum frame 908 as the fulcrum. An extension magnetic arm 909 is fixedly provided on the telescopic rotating cover 903. A fixed frame 910 is fixedly provided inside the motor housing 1. A tension spring 911 and a second electromagnet 912 are provided in the fixed frame 910. The tension spring 911 applies an elastic tension to the extension magnetic arm 909. When the second electromagnet 912 is energized, it can attract the extension magnetic arm 909 to overcome the elastic tension of the tension spring 911 and rotate.

[0042] like Figure 1 As shown, a rear end shell 101 is fixed to the rear end of the motor housing 1 by screws. The protective cover 808 and the fixing frame 910 are protected inside the rear end shell 101.

[0043] A dual-source electric power steering pump switching control system includes a dual-source electric power steering pump, a low-voltage controller and an electronic control unit. The low-voltage controller includes an inverter bridge composed of MOSFETs or IGBTs and its drive circuit, which is specifically used to drive the low-voltage winding. Its power supply is directly taken from the vehicle's 24V low-voltage battery.

[0044] The low-voltage controller is electrically connected to the low-voltage winding and drives and controls the low-voltage winding; the electronic control unit controls the high-voltage winding to be energized and operated.

[0045] The electronic control unit (ECU) determines whether the high-voltage power supply is faulty by monitoring the voltage signal of the vehicle's high-voltage circuit. Specifically, it monitors the status of the 800V high-voltage bus in real time through a voltage divider sampling circuit. When the ECU detects a fault in the vehicle's high-voltage power supply, such as when the voltage drops from 800V to below 100V in a very short time, the ECU cuts off the power supply to the high-voltage winding and sends a start command to the low-voltage controller. The low-voltage controller, based on the received command, drives the low-voltage winding to work, using the power of the 24V battery to drive the same rotor 3 to continue rotating, thereby driving the steering pump 4 to work.

[0046] Driven by the low-voltage winding, the speed and output power decrease, and the steering pump 4 provides about 40%-50% of the normal level of assistance. The steering wheel feels heavier, but the driver can still effectively control the direction and achieve safe parking.

[0047] During normal operation, the high-voltage winding in the stator winding 2 drives the rotor 3, causing the motor shaft 5 to drive the steering pump 4 to provide power steering assistance to the vehicle's steering wheel. During this process, as... Figure 5 As shown, the locking pin 8 is inserted into the eccentric blind hole 7. Because the eccentric blind hole 7 is eccentrically positioned, the inertia shaft 6 and the motor shaft 5 are relatively locked together, remaining relatively stationary. Thus, the inertia shaft 6 can provide internal support and reinforcement for the motor shaft 5, making the motor shaft 5, which carries the rotor 3, more durable and less prone to fatigue deformation during long-term use under vehicle bumps and impacts. Furthermore, the inertia shaft 6 and the motor shaft 5 remain relatively stationary, rotating synchronously, which avoids the problem of relative friction between the inertia shaft 6 and the motor shaft 5 under normal operating conditions, causing a gradual increase in clearance and weakening the supporting effect of the inertia shaft 6.

[0048] Under the above-mentioned normal operating conditions, the high-voltage winding drives the rotor 3 with a large power. The inertia shaft 6 and the motor shaft 5 remain relatively stationary. The rotor 3, the motor shaft 5 and the inertia shaft 6 are an integrated structure. Although the rotational inertia is large at this time, the response delay will not be significantly increased due to the large driving power. However, it can greatly improve the durability of the motor shaft 5 under bumpy conditions and avoid fatigue radial deformation of the motor shaft 5, which would cause interference and scraping problems between the rotor 3 and the stator winding 2.

[0049] When the vehicle's high-voltage power supply fails, the stator winding 2 of this invention switches to a low-voltage winding to drive the rotor 3, at which point the power is reduced. For example... Figure 5 As shown, when switching to the low-voltage winding, the first electromagnet 809 is powered once. After the first electromagnet 809 is energized and generates magnetic force, it attracts the control back plate 807, causing the control back plate 807 to move to the right. At this time, the locking pin 8 and the convex ring 802 are driven to move to the right, and the retaining spring 805 is further compressed. When the locking pin 8 is completely pulled out from the eccentric blind hole 7, the limiting lock head 812 will be stuck on the left side of the convex ring 802, preventing the convex ring 802 from resetting and moving under the elastic force of the retaining spring 805, so that the locking pin 8 remains in the retracted state.

[0050] When the locking pin 8 is pulled out of the eccentric blind hole 7, the moment of inertia shaft 6 can rotate relative to the motor shaft 5. During forward / reverse switching or sudden start / stop of the rotor 3 and motor shaft 5, the rotational inertia of the rotor 3 and motor shaft 5 is significantly reduced because the moment of inertia shaft 6 can rotate relative to the motor shaft 5. Since the power and torque are lower when driven by the low-voltage winding, the reduced rotational inertia of the rotor 3 improves the start / stop speed of the steering pump and the response speed during forward / reverse drive switching, reducing the resistance and lag during sharp steering.

[0051] After the vehicle is out of danger, it will be taken to the factory for high-voltage power supply repair and the repositioning of the aforementioned structures.

[0052] In actual use, high-voltage power supply failure in vehicles is a low-probability event. Most of the time, the vehicle is in normal operation, with the high-voltage winding driving the rotor 3. Therefore, the motor shaft 5 and the inertia sub-shaft 6 remain relatively stationary for a long time, which can easily lead to the solidification of the lubricating grease between the motor shaft 5 and the inertia sub-shaft 6, causing problems such as adhesion between the motor shaft 5 and the inertia sub-shaft 6. In an emergency situation of high-voltage power supply failure, this can easily lead to structural failure.

[0053] And the present invention is as follows Figure 5 and Figure 8 As shown, every certain period of time, preferably 6-12 months, the control motor 907 is rotated, driving the limit plate 902 to extend from the telescopic cover 903, so that the limit plate 902 is inserted into the protective cover 808 to limit the axial movement of the control back plate 807. Then, the first electromagnet 809 is energized. When the first electromagnet 809 is energized, it attracts the control back plate 807 to move. Because the limit plate 902 will block the position of the control back plate 807, the locking pin 8 cannot be completely moved out of the eccentric blind hole 7. At this time, the conical head 9 of the locking pin 8 is just between the eccentric blind hole 7 and the alignment hole 803. The conical head 9 has a conical structure, and part of the conical head 9 is in the eccentric blind hole 7, which cannot completely limit the eccentric blind hole 7. This allows the inertia shaft 6 to rotate slightly relative to the motor shaft 5, and also prevents the locking pin 8 from completely disengaging from the eccentric blind hole 7. It can be reset later by the guiding effect of the conical head 9.

[0054] The cone head 9 is located between the eccentric blind hole 7 and the alignment hole 803. At this time, when the motor shaft 5 is rotating and starting and stopping, the inertia sub-shaft 6 will move slightly relative to the motor shaft 5, thereby periodically performing maintenance rotation on the inertia sub-shaft 6 and the motor shaft 5, reducing the risk of adhesion caused by the two being relatively stationary for a long time.

[0055] When the first electromagnet 809 is de-energized, the cone head 9 is fully inserted into the eccentric blind hole 7 by the elastic force of the retaining spring 805 to reset. During the process, the cone-shaped guiding effect of the cone head 9 is not enough to make the inertia shaft 6 rotate relative to the motor shaft 5 to reset.

[0056] Therefore, in this invention, it is necessary to energize the second electromagnet 912, in conjunction with the reference. Figure 7As shown, when the second electromagnet 912 is energized, it attracts the extended magnetic arm 909 to rotate. The extended magnetic arm 909 and the telescopic rotating cover 903 cooperate to form a lever structure, amplifying the driving force of the second electromagnet 912, so that the limiting plate 902 can actively squeeze the control back plate 807, forcing the control back plate 807 to move away from the first electromagnet 809. Through the above-mentioned active squeezing, the return spring force of the compression spring 805 is maintained, so that the cone head 9 forces the inertia shaft 6 to rotate relative to the motor shaft 5 through the cone-shaped guide until the locking pin 8 is fully inserted into the eccentric blind hole 7 to lock the inertia shaft 6 and the motor shaft 5 relative to each other, completing the structural reset.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-source electric steering pump, comprising a motor housing and a stator winding disposed inside the motor housing and fixed thereto, characterized in that: The stator winding consists of a high-voltage winding and a low-voltage winding, which are independent of each other. When the vehicle's high-voltage power supply fails, the stator winding switches from the high-voltage winding to the low-voltage winding to operate. It also includes a rotor driven by stator windings, a motor shaft inserted at the center of the rotor, a steering pump fixedly installed on the outside of the motor housing, and the motor shaft drivingly connected to the steering pump; The motor shaft is a hollow shaft, and an inertia sub-shaft is provided inside the motor shaft for radial support of the motor shaft; when the high voltage winding is working, the motor shaft and the inertia sub-shaft are relatively stationary, and when the low voltage winding is working, the inertia sub-shaft can rotate relative to the motor shaft. An eccentric blind hole is provided at the end of the inertia sub-shaft. The eccentric blind hole is eccentrically set. A locking pin that can extend and retract is provided in the motor shaft. When the locking pin is inserted into the eccentric blind hole, the motor shaft and the inertia sub-shaft can be locked relative to each other. When the locking pin is pulled out from the eccentric blind hole, the inertia sub-shaft can rotate relative to the motor shaft. The motor shaft has a control groove inside, and a protruding ring is provided in the control groove. The locking pin is fixedly connected to the protruding ring. One end of the control groove is open, and the other end has an alignment hole. The locking pin is inserted into the alignment hole. An end pressure ring is detachably installed at the end of the motor shaft. A retaining spring is provided between the end pressure ring and the convex ring. The retaining spring applies pressure to the convex ring, causing the locking pin to tend to move into the eccentric blind hole. A synchronous coupling is fixedly installed on the side of the convex ring away from the locking pin. A control back plate is fixedly installed at the end of the synchronous coupling. A protective cover is fixedly installed inside the motor housing. A first electromagnet is fixedly installed inside the protective cover. When the first electromagnet is energized, it can generate magnetic force to attract and drive the control back plate, so that the convex ring overcomes the elastic force of the retaining spring and drives the locking pin to be pulled out of the eccentric blind hole.

2. The dual-source electric steering pump according to claim 1, characterized in that: A sidewall groove is provided on the sidewall of the control circular groove, and a spring strip is provided in the sidewall groove. One end of the spring strip is fixed to the inner wall of the sidewall groove, and the other end is provided with a limit lock head. When the locking pin is completely pulled out from the eccentric blind hole, the limit lock head will be stuck on one side of the convex ring, so that the convex ring cannot be reset and moved.

3. The dual-source electric steering pump according to claim 1, characterized in that: The locking pin has a conical head at its end. The surface of the protective cover has a through-hole groove. A limiting plate is inserted in the groove. The limiting plate is covered by a telescopic rotating cover. The limiting plate can be extended and retracted relative to the telescopic rotating cover. When the limiting plate extends, it can limit the control back plate. At this time, the first electromagnet is energized to attract the control back plate to move, so that the conical head moves just between the eccentric blind hole and the alignment hole.

4. A dual-source electric steering pump according to claim 3, characterized in that: The surface of the telescopic rotating cover is provided with a movable groove. A lead screw connection part is fixedly provided on the limiting plate. The lead screw connection part passes through the movable groove and extends to the outside of the telescopic rotating cover. A control lead screw is screwed in the lead screw connection part. The rotation of the control lead screw can drive the lead screw connection part to move the limiting plate to adjust its extension and retraction. A control motor for driving the rotation of the control lead screw is provided at the end of the control lead screw.

5. A dual-source electric steering pump according to claim 4, characterized in that: The telescopic rotating cover is provided with a support frame on its exterior, and the telescopic rotating cover can rotate with the support frame as the fulcrum. An extension magnetic arm is fixedly provided on the telescopic rotating cover. A fixed frame is fixedly installed inside the motor housing. A tension spring and a second electromagnet are installed in the fixed frame. The tension spring applies an elastic tension to the extended magnetic arm. When the second electromagnet is energized, it can attract the extended magnetic arm to overcome the elastic tension of the tension spring and rotate.

6. A dual-source electric steering pump switching control system, characterized in that, The system includes the dual-source electric power steering pump, low-pressure controller, and electronic control unit as described in any one of claims 1-5; The low-voltage controller is electrically connected to the low-voltage winding and drives and controls the low-voltage winding; the electronic control unit controls the high-voltage winding to be energized and operated. The electronic control unit (ECU) determines whether the high-voltage power supply is faulty by monitoring the voltage signal of the vehicle's high-voltage circuit. When the ECU detects a fault in the vehicle's high-voltage power supply, it cuts off the power supply to the high-voltage winding and sends a start command to the low-voltage controller. The low-voltage controller then drives the low-voltage winding to work according to the received command.

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