CN216185445U

CN216185445U - Redundant electric power steering device

Info

Publication number: CN216185445U
Application number: CN202122562929.1U
Authority: CN
Inventors: 吴丽媛; 杨霞
Original assignee: Beijing Jingwei Hirain Tech Co Ltd
Current assignee: Beijing Jingwei Hirain Tech Co Ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-05
Anticipated expiration: 2031-10-25

Abstract

An embodiment of the present invention provides a redundant electric power steering apparatus, including: a first circuit board and a second circuit board configured to control a motor; the first circuit board and the second circuit board are arranged in a stacking mode along the direction parallel to the end face of the shell of the motor; the first circuit board is provided with a plurality of control units; the second circuit board includes a plurality of redundant parts; the redundant parts are positioned on the same plane; each redundant part is respectively connected with the first circuit board in a bending way. The redundant electric power steering device reduces the occupied space of a circuit board in the redundant electric power steering device and the component composition, is favorable for improving the arrangement efficiency in packaging, reduces the size of packaging, improves the space utilization rate, and is favorable for overcoming the limitation of the installation space in a vehicle.

Description

Redundant electric power steering device

Technical Field

The utility model relates to the field of control, in particular to a redundant electric power steering device.

Background

An Electric Power Steering (EPS) system is formed by adding a signal sensing device, an electronic control device and a Steering assisting mechanism on the basis of a traditional mechanical Steering mechanism, and utilizes Power generated by an Electric motor to assist a driver in Steering. When the steering is not performed, the motor does not work; when the steering wheel is turned, the steering wheel torque and the rotation direction signal detected by the torque sensor are transmitted to the control unit, the control unit sends an instruction to the motor according to the torque and the direction thereof and the vehicle speed signal transmitted from the vehicle speed sensor, and the motor outputs the torque with corresponding magnitude and direction to generate the assistance.

Currently, some systems, including the EPS system, employ a packaging technique in which an Electronic Control Unit (ECU) that controls the rotational speed and rotational torque of a motor is integrated with the motor. With the continuous development of the EPS technology, due to the limitations on size and space, a power unit structure with an integrated motor and controller is more and more favored, and particularly, the installation space is more tense for parts of steering machines such as a double-pinion DP-EPS steering machine and a rack-assisted R-EPS steering machine, which are installed outside a cab. Therefore, in order to overcome the limitation of the installation space in the vehicle, it is necessary to improve the arrangement efficiency in the package and to reduce the size of the package, improving the space utilization.

However, as the safety requirement for the EPS controller increases and the number of vehicle electrical systems increases, adding a redundant electronic control unit becomes a main strategy for dealing with the above situation, in the existing redundant design, two ECUs perform mutual monitoring and independent operation, the hardware (H/W) structures of the two ECUs are almost the same, and usually, the two ECUs are respectively manufactured and integrated by a PCBA board, which inevitably increases the package size and the volume of the structure of the redundant electric drive control device, and is not favorable for overcoming the limitation of the installation space in the vehicle.

SUMMERY OF THE UTILITY MODEL

The present specification provides a redundant electric power steering apparatus to overcome at least one technical problem in the prior art.

According to an embodiment of the present specification, there is provided a redundant electric power steering apparatus including: a first circuit board and a second circuit board configured to control a motor, the first circuit board and the second circuit board being arranged in a stacked manner in a direction parallel to an end face of a housing of the motor,

the first circuit board is provided with a plurality of control units,

the second circuit board comprises a plurality of redundant parts, the redundant parts are located on the same plane, and each redundant part is respectively connected with the first circuit board in a bending mode.

Optionally, the number of the redundant parts is two,

the two redundant parts are axially symmetrical relative to the driving shaft of the motor.

Further optionally, the first circuit board and the second circuit board are both circular,

the second circuit board is divided into two semicircles in a bisection manner to form two redundant parts, and all devices arranged on the two redundant parts are axially and centrally symmetrical relative to a driving shaft of the motor.

Still further optionally, the redundant electric power steering apparatus further comprises a connector,

the two redundant parts are connected with one group of connectors, the two groups of connectors are axially and symmetrically arranged relative to the driving shaft of the motor,

each group of connectors comprises a first connector and a second connector.

Still further alternatively, the PIN PINs of the two sets of connectors are respectively welded on the two redundant portions in a centrosymmetric manner,

the welding positions of the PIN needles of each group of the connectors are linearly arranged and are distributed in parallel along the boundary line separating the two redundant parts.

Alternatively, the motor is a six-phase brushless motor,

the PIN needles of the motor are divided into two groups with the same number, the two groups of PIN needles of the motor are respectively welded on the positions, far away from the circle center, of the two redundant parts, and the PIN needles of each group of the motor are evenly distributed at equal intervals.

Still further optionally, the redundant electric power steering apparatus further comprises a base and a housing,

bosses are arranged on the upper surface and the lower surface of the base, the second circuit board and the first circuit board are respectively arranged on the upper surface and the lower surface of the base and are jointed with the bosses through heat conducting glue,

the base, the first circuit board and the second circuit board are contained in the shell, the connector is welded on the second circuit board, and an interface of the connector is communicated with the outer space of the shell.

Still further optionally, a ventilation channel is provided on the housing,

one end of the ventilation channel is arranged on the outer side surface of the shell, the other end of the ventilation channel is arranged on the inner upper surface of the shell, and a waterproof ventilation film is arranged at one end of the inner upper surface of the shell.

Still further optionally, the base is mounted on an end surface of the casing of the motor on the opposite side of the output portion of the driving shaft of the motor, the housing is fastened to one end of the casing of the motor on the opposite side of the output portion of the driving shaft of the motor, and a sealed space is formed between the housing and the casing of the motor,

a plurality of mounting lugs extending downwards are arranged on the side surface of the base, mounting holes are formed in the mounting lugs, mounting parts corresponding to the mounting lugs are arranged on the end surface of the shell of the motor on the opposite side of the output part of the driving shaft of the motor, the mounting lugs are mounted on the mounting parts through the mounting holes by screws,

the casing is provided with a wrapping part corresponding to the mounting lug, and when the casing is buckled on the casing of the motor, the wrapping part is buckled on the mounting part, so that the mounting lug is arranged in a sealed space between the casing and the casing of the motor.

Still further optionally, three buckles are uniformly arranged on the side surface of the shell along the circumferential direction by 120 degrees, the buckles and the wrapping portion are arranged at intervals, and a clamping block corresponding to the buckles is arranged on the side surface of the motor shell.

The beneficial effects of the embodiment of the specification are as follows:

adopt bilateral folding upper and lower floor circuit board to realize redundant control, reduced occupation space and the part of circuit board among the redundant electric power steering device and constitute, not only be favorable to improving the arrangement efficiency in the encapsulation, reduce the size of encapsulation, and for the redundant control device among the prior art, its structure assembly accessory quantity is halved, has reduced the installation procedure, and man-hour, manpower and materials are also greatly reduced, have improved the installation effectiveness. Meanwhile, the redundant electric power steering device has the advantages that the circuit board is fixed, connected, radiated and grounded on the same base, so that multiple functions are integrated, the size of the package is further reduced, and the space utilization rate is improved. In addition, the upper layer circuit board and the lower layer circuit board are parallel to the end face of the shell of the motor, so that the radial space is effectively utilized, the occupation of the axial space is reduced, the integral volume of the device is reduced, and the limitation of the installation space in a vehicle is favorably overcome.

The technical effects of the embodiments of the present description include:

1. in this embodiment, the rigid circuit board and the flexible circuit board are combined, and the circuit board for redundancy control is designed into a double-side folded upper and lower circuit board structure, so that the cloth piece for redundancy control is highly integrated, the connectors between boards are reduced, the occupied space of the whole circuit board for redundancy control is reduced, the space utilization rate is improved, and the packaging size is further reduced, which is one of the technical effects of the embodiments of the present specification.

2. In this embodiment, the base both had been used for connecting the motor, had played the fixed stay upper and lower floor circuit board through the boss design on it again, still played the effect of ground connection conduction, simultaneously, had played radiating effect through heat-conducting glue laminating circuit board, and the base collects fixed, connects, dispels the heat, ground connection function in one, has saved most of structures, has saved the assembly part, and the installation is simpler, easily realizes, is one of the technological effects of this specification embodiment.

3. In this embodiment, the upper and lower circuit boards are parallel to the end face of the casing of the motor, so that the radial space is effectively utilized, and the occupation of the axial space is reduced, thereby reducing the volume of the redundant control device.

4. In this embodiment, set up the parcel portion that is used for holding the installation ear on the shell, under the prerequisite of guaranteeing that the whole volume of device is as little as possible, with installation ear and the installation screw parcel on it inside the shell, not only can improve overall structure's leakproofness, can also effectively avoid probably causing the salt fog by the screw to corrode, is one of the technological effect of this specification embodiment.

5. In this embodiment, when the glue for sealing between the housing and the casing of the motor is not dried, the housing of the redundant electric power steering apparatus is fixed to the casing of the motor by the snap-fit design, which is beneficial to uniform glue drying, realizes connection between the housing and the casing, and ensures the sealing property of the inner space of the housing.

6. In this embodiment, the waterproof breathable film having the characteristics of water resistance, dust resistance, oil stain resistance, chemical agent resistance, high and low temperature resistance, aging resistance and the like is arranged at the top of the housing, so that the protection level of the redundant electric power steering device can reach IP6K9K, the waterproof breathable film is welded at the top of the housing, the operation is convenient, the implementation is easy, meanwhile, an opening for connecting the inside of the housing with the outside is designed at the side surface of the housing through the breathable channel, the space for installing the breathable valve is effectively saved, and the waterproof breathable film is one of the technical effects of the embodiment of the specification.

7. In this embodiment, the circuit board is designed to be circular according to the cylindrical shape of the motor, the second circuit board is designed to be two semicircles, the second circuit board and all devices thereon are arranged in central symmetry, and since the devices on the two semicircles are the same, that is, the same structural central symmetry, the structural distribution is more uniform, the space is more saved, and the motor is one of the technical effects of the embodiments of the present specification.

8. In this embodiment, in the EPS system using the redundant architecture, when any controller is abnormal, it may be determined whether normal instructions can be transmitted through inter-circuit board communication according to the abnormal state of the system to ensure that the system function is not degraded, so that when a signal or a component fails, the system function is not degraded to the maximum extent on the premise of ensuring the function safety, which is one of the technical effects of the embodiments of the present specification.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a front view of a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

fig. 2 is a top view of a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

fig. 3 is an exploded schematic view of a part of a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a redundant electric power steering apparatus provided in an embodiment of the present disclosure without a housing;

FIG. 5 is a top view of an unmounted housing of a redundant electric power steering apparatus provided in accordance with an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a circuit board in a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a housing in a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

FIG. 8 is a schematic bottom view of a housing of a redundant electric power steering apparatus provided in accordance with an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a circuit board and a connector in the redundant electric power steering apparatus provided in the embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a base in a redundant electric power steering apparatus provided in an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a latch in the redundant electric power steering apparatus provided in the embodiment of the present disclosure;

description of reference numerals: the structure comprises a motor 1, a machine shell 2, a driving shaft 3, a shell 4, an installation part 5, a wrapping part 6, a buckle 7, a clamping block 8, a limiting strip 9, a ventilation channel 10, a connector 11, a screw 12, a PIN at the plug end of a PIN group 13 of the motor, a circuit board 14, a base 15, a mounting bolt 16, a shell top opening 17, a first vertical part 18, a second vertical part 19, a connecting part 20, a waterproof and breathable film 21, a first connector 22, a second connector 23, a second circuit board 24, a first circuit board 25, a flexible connecting plate 26, a through groove 27, a mounting hole 28, a mounting lug 29, a base main body 30, a boss 31, a positioning PIN 32, a threaded hole 33 and a fixing part 34.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Redundancy control is an effective means for meeting continuous production requirements and improving system availability, and manufacturers are more pursuing reliability of production equipment along with the increase of competition of the manufacturing industry, and particularly, redundancy configuration is often required to be adopted for equipment for controlling key production processes. At present, most redundant systems based on programmable controllers adopt at least two sets of processor modules, namely at least two independent control units are designed, the redundant design in the prior art respectively arranges the two control units on two mutually independent circuit boards, and a circuit board is additionally arranged on the basis of the original circuit board, so that the size of a packaging size and a redundant control device can be increased by the double circuit boards arranged, and further the whole volume of the redundant electric power steering device is larger, and the limitation of the installation space in a vehicle is not favorably overcome.

In view of the above, embodiments of the present disclosure provide a redundant electric power steering apparatus that assists a steering operation of a driver in a transportation device such as an automobile, is highly integrated, is small in size, and realizes an electric power steering control function in a narrow space.

Fig. 1 to 11 illustrate a redundant electric power steering apparatus provided according to an embodiment of the present disclosure, as shown in fig. 1 to 11, the redundant electric power steering apparatus including: motor 1, base 15, housing 4, connector 11, and circuit board 14 configured to control motor 1. The circuit board 14, the base 15 and a part of the connector 11 are accommodated in the housing 4, the connector 11, the circuit board 14 and the base 15 are connected in sequence and mounted on the motor 1 through the base 15, the motor 1 is electrically connected with the circuit board 14, and the motor 1 is controlled by the circuit board 14.

Specifically, the circuit board 14 is a main structure of the redundant electric power steering apparatus, and as shown in fig. 6, the circuit board 14 includes a first circuit board 25 and a second circuit board 24, the first circuit board 25 and the second circuit board 24 are stacked in a direction parallel to the end face of the housing 2 of the motor 1, that is, the first circuit board 25 and the second circuit board 24 are stacked up and down, and three planes of the first circuit board 25, the second circuit board 24 and the end face of the housing 2 of the motor 1 are parallel to each other, so that the radial space is effectively utilized, the maximum effective use area in the minimum space in the axial direction of the driving shaft 3 of the motor 1 is utilized as much as possible, the occupation of the axial space is reduced, and the occupation space of the circuit board relative to the entire apparatus is reduced as much as possible.

In order to implement redundancy control, the first circuit board 25 is provided with a plurality of control units (not shown in the figure), and correspondingly, the second circuit board 24 comprises a plurality of redundancy parts, the number of the redundancy parts is the same as that of the control units, and the redundancy parts correspond to the control units one by one, so that each control unit is respectively connected with one set of power device to form a plurality of sets of processor modules, and multilateral redundancy and independent control are implemented. In the embodiment of the present disclosure, a set of power devices includes, but is not limited to, a connector, an MOS transistor, a capacitor inductor, and other devices, a set of processor modules includes, but is not limited to, a control device, a connector, an MOS transistor, a capacitor inductor, and other devices, the circuit board 14 may be a Printed Circuit Board (PCB), and the control unit is also referred to as a control device and a controller.

The plurality of redundant parts in the second circuit board 24 are located on the same plane, each redundant part is respectively connected with the first circuit board 25 in a bending mode, namely, a Semi-flexible printed circuit board (Semi-Flex PCB) is adopted between the redundant parts of the first circuit board 25 and the second circuit board 24 to realize bending parallelism, bilateral redundancy is formed, and independent control is achieved, so that radial space is effectively utilized, occupation of axial space is reduced, and the whole volume of the device is greatly reduced. In a specific embodiment, the number of the redundant portions is two, and the two redundant portions are respectively connected with the first circuit board 25 through a flexible connecting board 26 in a bending manner to form a circuit board structure with two-sided folding, wherein the flexible connecting board 26 is a flexible circuit board on which circuit board traces are arranged, so that the first circuit board 25 and devices on the redundant portions are interconnected through the circuit board traces. The second circuit board 24 is designed to be centrosymmetric in two parts, and the two redundant parts are axially centrosymmetric relative to the driving shaft of the motor 1. In order to further reduce the overall size of the redundant electric power steering device, the shapes of the first circuit board 25 and the second circuit board 24 are designed into a circle corresponding to the shape of the end face of the shell 2 of the motor 1, the second circuit board 24 is divided into two semicircles in equal halves to form two centrosymmetric redundant parts, and all devices arranged on the two redundant parts are designed to be axially centrosymmetric relative to the driving shaft of the motor 1, so that the two sets of processor modules have the same structural centrosymmetry due to the design, the structural arrangement is more uniform and compact, and the arrangement space of the circuit boards is greatly saved.

The connector 11 is a device for connecting two active devices for transmitting current or signals. In the embodiment of the present disclosure, for effective plugging and unplugging error proofing of the wire harness end, under the condition of implementing redundant power supply and signal input and output, the connectors 11 are designed as two groups of independent connectors, which are distinguished according to functions, and each group of connectors 11 includes: power connectors, signal connectors and TAS connectors. Both redundant parts are connected to a set of connectors 11, each set of connectors 11 being an interface for connecting the corresponding control unit to an external power source and an external device, the sets of connectors 11 being independent of each other. In a specific embodiment, a suitable connector male terminal interface is selected, each group of connectors 11 includes a first connector 22 and a second connector 23, the power PIN and the signal PIN are integrated in one male terminal interface, i.e., the first connector 22, and the PINs of the TAS are integrated in the other male terminal interface, i.e., the second connector 23, so as to reduce the occupied space of the connectors 11 as much as possible while satisfying the function. Meanwhile, the two groups of connectors 11 are also in central symmetry relative to the axial direction of the driving shaft of the motor 1, so that the same structures on the two sets of processor modules are ensured to be in central symmetry, the arrangement is more uniform and compact, and the occupied space of the connectors 11 is smaller.

In another specific embodiment, the PIN PINs of the two groups of connectors 11 are respectively soldered on the two redundant parts in a central symmetry manner, and meanwhile, in order to make more space on the circuit board 14 for arranging other electronic components, as shown in fig. 6, the soldering positions of the PIN PINs of each group of connectors are linearly arranged and are distributed in parallel along the boundary line separating the two redundant parts, so that the second circuit board has more space for arranging other electronic components, thereby ensuring that the first circuit board with smaller space occupation and the two semicircular redundant parts can be arranged with two sets of processor modules.

The base 15 is mainly used for mounting the circuit board 14 on the motor 1, and plays a role of fixing and supporting the circuit board 14. Since the circuit board 14 in the embodiment of the present disclosure adopts a double-side folded upper and lower circuit board structure, in order to simultaneously ensure the fixing and supporting functions of the first circuit board 25 and the second circuit board 24, the second circuit board 24 and the first circuit board 25 are respectively mounted on the upper and lower surfaces of the base 15, and the flexible connecting board 26 is disposed on the side surface of the base 15 and respectively connected to the redundant portions of the first circuit board 25 and the second circuit board 24. In a specific embodiment, as shown in fig. 3 and 10, the base 15 includes a base body 30 and fixing portions 34, a plurality of fixing portions 34 for mounting and fixing the circuit board 14 are disposed on the upper and lower surfaces of the base body 30, screw holes 33 are opened on the fixing portions 34, and the mounting bolts 16 are inserted through the screw holes 33 on the fixing portions 34 to mount the second circuit board and the first circuit board on the upper and lower surfaces of the base 15, respectively. In specific implementation, at first wear to establish screw hole 33 on the base body 30 lower surface through mounting bolt 16, install first circuit board on the lower surface of base 15, fold a plurality of redundant parts through the flexonics board on the upper surface of base body 30, then rethread mounting bolt 16 wears to establish screw hole 33 on the base body 30 upper surface, with a plurality of second circuit boards fixed mounting respectively at the upper surface of base 15, thereby accomplish the installation of circuit board 14 on base 15, and the operation is simple, and firm in connection is stable.

Furthermore, because the high-power devices connected to the circuit board 14 have large heat dissipation power consumption, and the high-power devices need to be designed for heat dissipation in order to ensure the stable operation of the redundancy control device, in the embodiment of the present specification, the bosses 31 are disposed on the upper and lower surfaces of the base 15, that is, the bosses 31 are disposed on the upper and lower surfaces of the base body 30, the first circuit board, the second circuit board and the bosses 31 are all bonded by the heat-conducting glue, the bosses 31 on the upper and lower surfaces of the base body 30 are correspondingly designed according to the MOS transistors on the second circuit board and the first circuit board and the copper-exposed regions on the pre-driving position, so that the bosses 31 are connected to the regions of the second circuit board and the first circuit board, and the second circuit board and the first circuit board are bonded by the heat-conducting glue for heat dissipation, thereby ensuring the stable operation of the high-power devices, and thus, the arrangement of a separate heat dissipation device in the redundancy electric power steering device is omitted, and the overall size of the redundant electric power steering apparatus is reduced. In a specific implementation process, the height of the boss 31 is smaller than that of the fixing portion 34, so that when the first circuit board and the second circuit board are mounted on the base 15, a certain gap is formed between the boss 31 and the first circuit board and between the boss 31 and the second circuit board, and a space is provided for the arrangement of the heat conducting glue.

In order to mount the circuit board 14 on the base 15 quickly and accurately, in the embodiment of the present disclosure, the fixing portion 34 is further provided with a positioning pin 32, and the first circuit board and the second circuit board are respectively provided with positioning holes (not shown in the figure) corresponding to the positioning pin 32, so that the positioning pin 32 is inserted into the positioning holes of the first circuit board and the second circuit board, and the circuit board 14 can be accurately and quickly positioned on the base 15, thereby realizing quick mounting.

The base 15 is installed on the end face of the casing 2 of the motor 1 on the opposite side of the output part of the driving shaft 3 of the motor 1, so that the circuit board 14 and the connector 11 in the redundant electric power steering device are fixedly connected to the end face of the casing 2, and are buckled on one end of the casing 2 of the motor 1 on the opposite side of the output part of the driving shaft 3 of the motor 1 through the shell 4, a sealed space is formed between the shell 4 and the casing 2 of the motor 1, and the base 15, the circuit board 14 and the connector 11 are partially accommodated in the sealed space to play a role of protection

In addition, in a specific embodiment, the base 15 fixes the circuit board 14 by a plurality of mounting bolts 16, and the base 15 and the circuit board 14 are mounted on the motor 1 by the screws 12, so that the current can be transmitted to the base 15 by the mounting bolts 16, and then transmitted to the motor 1 by the screws 12 for the purpose of grounding, that is, the base 15 not only plays a role of fixing and supporting the circuit board 14 and connecting the motor 1, but also plays a role of grounding conduction. In the embodiment of the present specification, the base 15 has fixing, connecting, heat dissipating, and grounding functions, and integrates multiple functions, thereby eliminating most of the structures, saving the assembly parts, and reducing the overall size of the redundant electric power steering apparatus.

In another embodiment, in order to reduce the overall size of the redundant electric power steering apparatus as much as possible and ensure the stability of the connection between the base 15 and the motor 1, a plurality of mounting portions 5 are provided on the end surface of the housing 2 of the motor 1 on the opposite side of the output portion of the driving shaft 3 of the motor 1, and correspondingly, a plurality of mounting lugs 29 extending downward are provided on the side surface of the base 15, the mounting lugs 29 correspond to the mounting portions 5 of the motor 1, and mounting holes 28 are opened on the mounting lugs 29, and the mounting lugs 29 are mounted on the mounting portions 5 by penetrating the mounting holes 28 through screws 12, so that the base 15 and the circuit board 14 and the connector 11 thereon are fixed on the end surface of the housing 2. Furthermore, the casing 4 is provided with a wrapping part 6 corresponding to the mounting lug 29, when the casing 4 is buckled on the casing 2 of the motor 1, the wrapping part 6 is buckled on the mounting part 5, so that the mounting lug 29 is arranged in a sealed space between the casing 4 and the casing 2 of the motor 1, the base 15 and a circuit board 14 and a connector 11 on the base are partially wrapped in the casing 4, meanwhile, a screw 12 for connection is also wrapped in the casing 4, the redundant electric power steering device is arranged on the chassis, the salt spray test requirement is higher, the wrapping part 6 of the casing 4 directly wraps the whole screw 12, and the problem that some screws are difficult to reach the design requirement of the salt spray test can be avoided.

In the embodiment of the present disclosure, the housing 4 serves as a protection structure and is fastened to the casing 2 of the motor 1, the base 15, the first circuit board 25, and the second circuit board 24 are accommodated in the housing 4, the connector 11 is welded to the second circuit board 24, a part of the connector is accommodated in the housing 4, and the interface is communicated with an external space of the housing 4, so as to protect the base 15, the first circuit board 25, the second circuit board 24, and the connector 11. In a specific embodiment, three buckles 7 are uniformly arranged on the side surface of the housing 4 along the circumferential direction at 120 degrees, correspondingly, a clamping block 8 corresponding to the buckle 7 is arranged on the side surface of the casing 2 of the motor 1, the clamping block 8 is clamped in the buckle 7, the housing 4 is buckled on the casing 2, the casing 4 is buckled on the casing 2 after the casing 4 and the casing 2 are sealed through gluing, the casing 2 is buckled on the housing 4 after the gluing, when the glue between the casing 4 and the casing 2 is not dried, the buckle 7 fixes the casing 4 and the casing 2, the uniform glue drying is facilitated, the connection between the casing 4 and the casing 2 is more facilitated, and the sealing is ensured. In detail, as shown in fig. 11, the buckle 7 includes a first vertical portion 18, a second vertical portion 19, and a connecting portion 20, one end of each of the first vertical portion 18 and the second vertical portion 19 is fixed on a side surface of the housing 4, the other end of each of the first vertical portion 18 and the second vertical portion 19 is connected to the connecting portion 20, and the buckle 7 for clamping the fixture block 8 is formed among the first vertical portion 18, the second vertical portion 19, and the connecting portion 20. In addition, set up a spacing 9 respectively in the both sides of fixture block 8, when buckle 7 was located in the fixture block 8 card, first vertical portion 18 card was established between one of them spacing 9 and fixture block 8, and the card of second vertical portion 19 was established between another spacing 9 and fixture block 8, on the one hand, the quick accurate location of being connected between shell 4 and the casing 2 of being convenient for, on the other hand, can further strengthen the stability of being connected between shell 4 and the casing 2. For avoiding the interference between redundant electric power steering device mesostructure, buckle 7 sets up with 6 intervals of parcel portion, and at specific implementation in-process, parcel portion 6, buckle 7 and installation department 5, fixture block 8 equally divide and do not set up threely, at circumferencial direction 120 evenly distributed, and three parcel portion 6 and the setting of three buckle 7 interval, and is corresponding, and three installation department 5 also sets up with three fixture block 8 interval.

The motor 1 of the redundant electric power steering device is a six-direction brushless motor and can be regarded as two three-phase motors. In the specific implementation process, the PIN needles of the motor 1 are divided into two groups with the same number, and in order to form a short-distance transmission loop, as shown in fig. 4, the two groups of PIN needles of the motor 1 are respectively welded at positions far from the circle center of the two redundant parts, and each group of PIN needles of the motor 1 are uniformly distributed at equal intervals. That is, the PIN PINs of the motor 1 are respectively (three-to-three) inserted into the through slots 27 on the first circuit board 25 and welded on the two redundant parts, so that the power supply is mutually independent input, the motor 1 obtains power supply from the control unit through the motor interface, and simultaneously feeds back the motor position information, current information and the like to the control unit through the motor interface, and the control unit drives the three-phase bridge circuit to output the required torque through current closed-loop control.

In the embodiment of the present disclosure, the redundant EPS controller of the electrically-driven redundant electric power steering apparatus is two controllers, and the two controllers on the first circuit board 25 communicate with each other through ethernet or CAN FD, and the connector 11 and the devices on the circuit board 14 are arranged to provide two sets of independent power supply system, ignition system and CAN bus on the periphery of the redundant control apparatus, and the redundant control apparatus is internally composed of two independent TAS sensors, the redundant EPS controller and a six-phase brushless motor. The single EPS controller consists of a power supply processing module, an MCU minimum system, a torque sensor power supply module, a torque sensor conditioning circuit module, a temperature control module, a CAN communication module, a motor driving module and a motor current sampling module. Meanwhile, in order to improve the functional safety of the system, each phase can be provided with a turn-off MOS, and when a certain phase fails, the output of the phase can be cut off.

In the application process, the redundant EPS controller obtains system power supply and ignition signals from two independent power supply systems of the whole vehicle through a whole vehicle redundant interface, obtains information such as the rotating speed of an engine of the whole vehicle, the vehicle speed and an ADAS request through two independent CAN buses, simultaneously transmits EPS system state and information responding to the ADAS to the outside through the CAN buses, and obtains steering wheel turning angle and torque signals through a TAS interface, wherein the type of the output signals of the sensor is SPC signals. According to the input of the whole vehicle and the input of the TAS, the controller provides proper assistance through the driving motor. In the process, the motor obtains power supply from the controller through the motor interface, and simultaneously feeds back motor position information, current information and the like to the controller through the motor interface, and the controller drives the three-phase bridge circuit to output required torque through current closed-loop control.

Because the EPS system of the electric power steering device adopts a redundant architecture, the function of the system can be guaranteed not to be degraded to the maximum extent on the premise of guaranteeing the function safety when a signal or a component fails. When any controller is abnormal, whether normal instructions can be transmitted through communication between the circuit boards can be judged according to the abnormal state of the system, and the function of the system is not degraded.

To sum up, this specification discloses a redundant electric power steering device, adopts bilateral folding lower floor circuit board to realize redundant control, has reduced occupation space and the part of circuit board and has constituteed among the redundant electric power steering device, not only is favorable to improving the efficiency of arranging in the encapsulation, reduces the size of encapsulation, and for the redundant control device among the prior art, its structure assembly accessory quantity halves, has reduced the installation procedure, and man-hour, manpower and materials are also greatly reduced, have improved the installation effectiveness. Meanwhile, the redundant electric power steering device has the advantages that the circuit board is fixed, connected, radiated and grounded on the same base, so that multiple functions are integrated, the size of the package is further reduced, and the space utilization rate is improved. In addition, the upper layer circuit board and the lower layer circuit board are parallel to the end face of the shell of the motor, so that the radial space is effectively utilized, the occupation of the axial space is reduced, the integral volume of the device is reduced, and the limitation of the installation space in a vehicle is favorably overcome.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Finally, it is to be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A redundant electric power steering apparatus, characterized by comprising: a first circuit board and a second circuit board configured to control a motor, the first circuit board and the second circuit board being arranged in a stacked manner in a direction parallel to an end face of a housing of the motor,

the first circuit board is provided with a plurality of control units,

2. The redundant electric power steering apparatus according to claim 1, wherein the number of the redundant portions is two,

3. The redundant electric power steering apparatus according to claim 2, wherein the first circuit board and the second circuit board are both circular,

4. The redundant electric power steering apparatus according to claim 3, further comprising a connector,

each group of connectors comprises a first connector and a second connector.

5. The redundant electric power steering apparatus according to claim 4, wherein the PIN PINs of the two sets of socket connectors are welded to the two redundant portions, respectively, in a central symmetry,

6. The redundant electric power steering apparatus according to any one of claims 2 to 5, wherein the motor is a six-phase brushless motor,

7. The redundant electric power steering apparatus according to claim 4, further comprising a base and a housing,

8. The redundant electric power steering apparatus according to claim 7, wherein an air-permeable passage is provided on the housing,

9. The redundant electric power steering apparatus according to claim 7, wherein the base is mounted on an end surface of a casing of the motor on a side opposite to the output portion of the driving shaft of the motor, the housing is fastened to an end of the casing of the motor on a side opposite to the output portion of the driving shaft of the motor, and forms a sealed space with the casing of the motor,

10. The redundant electric power steering apparatus according to claim 9, wherein three hooks are uniformly provided on a side surface of the housing at an angle of 120 ° in a circumferential direction, the three hooks are spaced apart from the wrapping portion, and a latch corresponding to the three hooks is provided on a side surface of a housing of the motor.