Parking locking mechanism, control method and control device thereof and vehicle
By employing a motor-driven design for the ratchet, pawl, and ratchet cover, and combining multiple sets of redundant backup and monitoring modules for the pawls, the problems of complex structure, low stability, and high cost of existing parking locking mechanisms have been solved, thereby improving the stability, accuracy, and cost of the locking mechanism.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-03-10
AI Technical Summary
Existing parking lock mechanisms are complex in structure, have low locking accuracy and stability, and are costly, bulky, or have redundant structures that are large and heavy.
The design employs a ratchet, pawl, and ratchet cover. Locking is achieved by rotating the ratchet cover via a parking motor. Combined with a redundant backup design of multiple pawls, the monitoring module provides precise control. By utilizing motor drive and the meshing of multiple sets of pawls, the design reduces space occupation and improves stability and accuracy.
It improves the stability and precision of the locking mechanism, reduces cost and size, while also having good impact resistance, stable transmission, and the ability to accurately monitor and control the locking process, reducing the risk of abnormal locking.
Smart Images
Figure CN121626073A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of vehicles, and in particular to a parking lock mechanism and a control method, a control device and a vehicle thereof. BACKGROUND
[0002] With the accelerating trend of chassis drive-by-wire, electronic mechanical brake (EMB) technology has become an important direction for the development of future brake systems. In the design of its parking structure, there are currently two typical schemes: one is to draw lessons from the implementation of electronic parking brake (EPB) and additionally add a set of brake structure used only for parking on the basis of the existing driving brake transmission mechanism. This scheme not only has a high cost, but also leads to an increase in the overall size of the brake. The second is to fix the transmission mechanism at a certain position by designing a locking mechanism and maintain the clamping force to achieve the parking function. However, the existing locking mechanism often has a complex structure, and the locking precision and stability are relatively low, which still needs to be further optimized. SUMMARY
[0003] In order to solve at least one of the technical problems mentioned above, the present disclosure provides a parking lock mechanism and a control method, a control device and a vehicle thereof.
[0004] According to an aspect of the present disclosure, a parking lock mechanism is provided, comprising: a parking motor, a plurality of pawls, a ratchet wheel and a ratchet wheel cover. The ratchet wheel is arranged on the rotating shaft of the mechanical brake motor. The rotating shaft of the parking motor is provided with an output gear, and the ratchet wheel cover is provided with a tooth surface engaged with the output gear, so that the parking motor drives the ratchet wheel cover to rotate when the parking motor rotates. The plurality of pawls are arranged circumferentially and spaced apart, and the ratchet wheel cover comprises a plurality of spaced apart side walls and a plurality of gaps formed by the side walls, so that during rotation of the ratchet wheel cover in a first direction, the free ends of the plurality of pawls are engaged with the ratchet wheel through the plurality of gaps, and during rotation of the ratchet wheel cover in a second direction, the free ends of the plurality of pawls are separated from the ratchet wheel through the plurality of side walls, the first direction and the second direction being opposite directions.
[0005] In some possible implementations, a detection module is further included, which comprises a clamping force monitoring unit for monitoring the braking force of the mechanical brake motor, a current monitoring unit for monitoring the current of the parking motor, a first limit unit for limit detection of the ratchet wheel cover, and a second limit unit for limit detection of the pawl.
[0006] In some possible implementation manners, the base further comprises a plurality of first connecting members, and fixed ends of the plurality of pawls are rotatably connected with the plurality of first connecting members respectively.
[0007] In some possible implementation manners, the base further comprises a first reset member, the base further comprises a second connecting member, a fixed end of the first reset member is connected with the second connecting member, and a free end of the first reset member is connected with the ratchet cover.
[0008] In some possible implementation manners, the base further comprises a plurality of second reset members, the base further comprises a plurality of third connecting members, fixed ends of the plurality of second reset members are connected with the plurality of third connecting members respectively, and free ends of the plurality of second reset members are connected with the plurality of pawls respectively.
[0009] In some possible implementation manners, the base further comprises a limiting hole, and the ratchet cover is provided with a limiting member adapted to the limiting hole.
[0010] According to a second aspect of the present disclosure, a control method of a parking lock mechanism is provided, comprising: If a parking lock instruction is received and a clamping force generated by a mechanical brake motor reaches a preset clamping force threshold, the parking motor is controlled to rotate in a first direction to drive the ratchet cover to rotate in a second direction, the first direction and the second direction being two opposite directions; If the ratchet cover rotates to reach a first preset rotation condition, the mechanical brake motor is controlled to rotate in the second direction to drive the ratchet to rotate in the second direction, so that the plurality of pawls are engaged with the ratchet through the gap of the ratchet cover; When the mechanical brake motor rotates to reach a second preset rotation condition, the mechanical brake motor and the parking motor are controlled to stop rotating; When the ratchet cover and the plurality of pawls meet a preset stable condition, it is determined that the locking is successful.
[0011] In some possible implementation manners, the control method comprises: In response to receiving a parking release instruction, the parking motor is controlled to rotate in the second direction to drive the ratchet cover to rotate in the first direction; If the ratchet cover rotates to reach a third preset rotation condition, the mechanical brake motor is controlled to rotate in the first direction to drive the ratchet to rotate in the first direction, so that the ratchet and the plurality of pawls are separated through the plurality of side walls of the ratchet cover; When the mechanical brake motor rotates to reach a fourth preset rotation condition, the mechanical brake motor and the parking motor are controlled to stop rotating.
[0012] According to a third aspect of the present disclosure, a control device of a parking lock mechanism is provided, comprising: a first control module configured to control the parking motor to rotate in a first direction to drive the ratchet cover to rotate in a second direction if the clamping force of the mechanical brake motor reaches a preset clamping force threshold, the first direction and the second direction being opposite directions; a second control module configured to control the mechanical brake motor to rotate in the second direction to drive the ratchet to rotate in the second direction so that the plurality of pawls engage with the ratchet through the gaps of the ratchet cover if the ratchet cover rotates to reach a first preset rotation condition; a third control module configured to control the mechanical brake motor and the parking motor to stop rotating when the mechanical brake motor rotates to reach a second preset rotation condition; a locking module configured to determine that the locking is successful when the ratchet cover and the plurality of pawls meet a preset stable condition.
[0013] According to a fourth aspect of the present disclosure, a vehicle is provided, characterized in comprising the parking lock mechanism according to the first aspect.
[0014] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, but not limiting the present disclosure.
[0015] The present disclosure has the following beneficial effects: The ratchet is arranged on the rotating shaft of the mechanical brake motor, the output gear is arranged on the rotating shaft of the parking motor, and the tooth surface engaging with the output gear is arranged on the ratchet cover, so that the parking motor drives the ratchet cover to rotate when the parking motor rotates. The motor driving is adopted, and compared with the bistable electromagnet driving mode, the impact resistance is better, the problem of abnormal locking can be effectively avoided, the rotating shaft of the ratchet cover and the parking motor is directly engaged and connected, the occupied space is reduced, the connection is stable, and the transmission mode is more stable. The plurality of pawls are arranged at intervals along the circumference of the ratchet, the ratchet cover includes a plurality of side walls arranged at intervals and a plurality of gaps formed by the plurality of side walls, so that the free ends of the plurality of pawls engage with the ratchet through the plurality of gaps during the rotation of the ratchet cover in the first direction, and the free ends of the plurality of pawls are separated from the ratchet through the plurality of side walls during the rotation of the ratchet cover in the second direction. The first direction and the second direction are opposite directions. Multiple sets of pawls are used to realize redundancy backup, and the structure size is smaller, the weight is lighter, and the cost is lower than most existing redundancy schemes. The arrangement mode of the pawls at different positions of the ratchet circumference can realize the reduction of clamping force attenuation, the improvement of clamping force, and the control precision.
[0016] Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0018] Figure 1 A structure schematic diagram of a side view of a parking lock mechanism according to an embodiment of the present application is shown. Figure 2 A structure schematic diagram of a top view of a parking lock mechanism according to an embodiment of the present application is shown. Figure 3 A structure schematic diagram of a packaging of a parking lock mechanism according to an embodiment of the present application is shown. Figure 4 A structure schematic diagram of a base of a parking lock mechanism according to an embodiment of the present application is shown. Figure 5 A flowchart of a locking control method of a parking lock mechanism according to an embodiment of the present application is shown. Figure 6 A flowchart of a locking release control method of a parking lock mechanism according to an embodiment of the present application is shown. Figure 7 A structure schematic diagram of a control device of a parking lock mechanism according to an embodiment of the present application is shown.
[0019] Reference signs 1, parking motor; 2, pawl; 21, first pawl; 22, second pawl; 3, ratchet wheel; 4, ratchet wheel cover; 51, second limiting unit; 52, first limiting unit; 6, base; 7, first connecting piece; 8, first reset piece; 9, second connecting piece; 10, second reset piece; 11, third connecting piece; 12, limiting hole; 13, shell; 14, mechanical brake motor; 141, mechanical transmission gear; 142, brake rotating shaft; 15, magnetic ring; DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0021] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to structure that is different than other structure, but do not necessarily imply that the structure is ordered or that one precedes or follows another. The use of the term "and / or" to refer to a relationship between entities is not exclusionary, rather, it is intended to cover the relationships of all of the several referenced items. The use of the term "at least one" is intended to cover all of the several referenced items individually as well as any combination or permutation of those items. The use of the term "comprising" is intended to cover the recited elements as well as additional elements that are not recited. The use of the term "including" is intended to cover the recited elements as well as additional elements that are not recited.
[0022] Various exemplary embodiments, features, and aspects of the present disclosure will be described herein below with reference to the accompanying drawings. Like reference numerals in the drawings denote like or similar elements. Although various aspects of embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted.
[0023] The term "exemplary" is used herein in the sense of serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
[0024] The term "and / or" used herein is merely used to associate associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or at least any combination of at least two of a plurality, for example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.
[0025] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following detailed description. Those skilled in the art will understand that the present disclosure can be implemented without certain specific details. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail in order to highlight the main idea of the present disclosure.
[0026] Figures 1-4 A parking lock mechanism according to an embodiment of the present disclosure is shown as follows, Figure 1 As shown, the above mechanism includes a parking motor 1, a plurality of pawls 2, a ratchet wheel 3, and a ratchet wheel cover 3; The ratchet wheel 3 is arranged on the rotating shaft of the mechanical brake motor 14; An output gear is arranged on the rotating shaft of the parking motor 1, and a tooth surface engaging with the output gear is arranged on the ratchet wheel cover 3, so that the ratchet wheel cover 3 is driven to rotate when the parking motor 1 rotates; A plurality of pawls 2 are circumferentially spaced along the ratchet wheel 3, and the ratchet wheel cover 3 comprises a plurality of spaced side walls and a plurality of gaps formed between the side walls, so that during rotation of the ratchet wheel cover 3 in a first direction, the free ends of the plurality of pawls 2 are respectively engaged with the ratchet wheel 3 through the plurality of gaps, and during rotation of the ratchet wheel cover 3 in a second direction, the free ends of the plurality of pawls 2 are respectively separated from the ratchet wheel 3 through the plurality of side walls, the first direction and the second direction being opposite directions.
[0027] The mechanical brake motor 14 is a motor that drives the mechanical transmission gear 141 to drive the brake system to brake during driving, and the parking locking mechanism locks the rotating shaft of the mechanical brake motor 14 when the clamping force generated by the mechanical brake motor 14 reaches a preset clamping force threshold, so as to maintain the parking state.
[0028] The ratchet wheel 3 is arranged on the brake rotating shaft 142 of the mechanical brake motor 14, and a rotatable ratchet wheel cover 3 is arranged at a preset distance from the periphery of the ratchet wheel 3. The outer peripheral side wall of the ratchet wheel cover 3 is provided with a tooth surface, which is engaged and connected with the output gear on the rotating shaft of the parking motor 1. When the rotating shaft of the parking motor 1 is driven to rotate, the ratchet wheel cover 3 is driven to rotate through the engaged gear and tooth surface. A plurality of movable pawls 2 are circumferentially equidistantly arranged along the ratchet wheel 3, and the plurality of pawls 2 are selectively engaged with the ratchet wheel 3. A plurality of side walls are spaced apart on the ratchet wheel cover 3, and gaps are formed between the side walls. When the ratchet wheel cover 3 is driven to rotate by the parking motor 1, the pawls 2 can be engaged with the ratchet wheel 3 through the gaps, and the pawls 2 can also be separated from the ratchet wheel 3 through the side walls.
[0029] In some embodiments, the plurality of pawls 2 comprises a first pawl 212 and a second pawl 222, as shown in Figure 2 The first pawl 212 and the second pawl 222 are circumferentially equidistantly arranged along the ratchet wheel 3, and the ratchet wheel cover 3 comprises a first side wall and a second side wall. The first side wall and the second side wall are spaced apart to form a first gap and a second gap. The free end of the first pawl 212 and the free end of the second pawl 222 are selectively engaged with the ratchet wheel 3 through rotation of the ratchet wheel cover 3. When the vehicle needs to maintain the parking state, the parking motor 1 is started to rotate in a first direction, and the ratchet wheel cover 3 is driven to rotate in a second direction through the output gear, so that the free end of the first pawl 212 and the free end of the second pawl 222 rotate in a direction towards the ratchet wheel 3 through the first gap and the second gap of the ratchet wheel cover 3, and gradually engage with the ratchet wheel 3. When the vehicle needs to release the parking state, the parking motor 1 is started to rotate in a second direction, and the ratchet wheel cover 3 is driven to rotate in a first direction through the output gear, so that the free end of the first pawl 212 and the free end of the second pawl 222 rotate in a direction away from the ratchet wheel 3 under the action of the first side wall and the second side wall of the ratchet wheel cover 3, and gradually separate from the ratchet wheel 3, and then abut against the first side wall and the second side wall, respectively.
[0030] In some embodiments, the plurality of pawls 2 can be in synchronous engagement design with the ratchet wheel 3, increasing the stability and mechanical strength of the locking, or in non-synchronous engagement design with the ratchet wheel 3. For example, if the plurality of pawls 2 includes a first pawl 212 and a second pawl 222, when the first pawl 212 is engaged with the gear, the second pawl 222 has not yet reached the engagement position, achieving higher precision locking. After the mechanical brake motor 14 reaches the preset clamping force threshold, a second direction, i.e. reverse rotation, is required to rotate by an angle α to gradually contact and lock the ratchet wheel 3 and the pawl 2, and the angle α of reverse rotation will cause the system clamping force F to decrease by △F, which is related to the angle α and the system stiffness. The non-synchronous engagement design of the plurality of pawls 2 with the ratchet wheel 3 can make the angle α of reverse rotation smaller, and thus the decrease △F of the clamping force F smaller, i.e. by reducing the decay value of the clamping force, the locking precision of the clamping force is greatly improved.
[0031] The above technical solution realizes selective engagement of the plurality of pawls 2 and the ratchet wheel 3 by engaging the output gear of the parking motor 1 with the tooth surface of the ratchet cover 3 to drive the ratchet cover 3 to move, thereby quickly realizing parking locking and unlocking. The motor drive is adopted, which has better impact resistance than the bistable electromagnet drive mode, and can effectively avoid the problem of abnormal locking. The ratchet cover 3 is directly engaged and connected with the rotating shaft of the parking motor 1, reducing the occupied space, stabilizing the connection, and making the transmission mode more stable. Multiple sets of pawls 2 are adopted to realize redundancy backup, and the structure size is smaller, the weight is lighter, and the cost is lower than most existing redundancy schemes. The arrangement of the pawls 2 at different positions of the ratchet wheel 3 can realize the reduction of clamping force decay, improve the clamping force, and control the precision.
[0032] In some embodiments, a detection module is further included, which includes a clamping force monitoring unit for monitoring the braking force of the mechanical brake motor 14, a current monitoring unit for monitoring the current of the parking motor 1, a first limiting unit 52 for limiting the ratchet cover 3, and a second limiting unit 51 for limiting the pawl 2.
[0033] The clamping force detection unit of the braking force of the mechanical brake motor 14 includes a braking current monitoring unit and an angle monitoring unit. The braking current monitoring unit monitors the current of the mechanical brake motor 14, and the angle monitoring unit is used to detect the rotation angle and the number of turns of the mechanical brake motor 14, so as to determine the displacement of the brake pad moving forward. The clamping force is determined by the current and the rotation angle of the mechanical brake motor 14. The current monitoring unit is used to monitor the current of the parking motor 1. The first limiting unit 52 is used to detect the position of the ratchet cover 3, and the second limiting unit 51 is used to detect the position of the pawl 2.
[0034] In some embodiments, the angle monitoring unit can employ a magnetic ring 15 and a Hall sensor for angle monitoring. The first limit unit 52 and the second limit unit 51 can be micro switches. When the ratchet cover 3 moves to the first preset position, the first limit unit 52 is triggered. The second limit unit 51 includes a plurality of pawl 2 micro switches, each of which is used to monitor the rotation position of the plurality of pawls 2. When the free end of each of the plurality of pawls 2 moves to the corresponding second preset position, the pawl 2 micro switch corresponding to the pawl 2 is triggered.
[0035] In some embodiments, the parking lock process is as follows: when the mechanical brake motor 14 starts to rotate in the first direction, the clamping force monitoring unit monitors the clamping force generated by the mechanical brake motor 14, the angle monitoring unit monitors the angle of rotation of the mechanical brake motor 14, and the brake current monitoring unit monitors the current of the mechanical brake motor 14. The clamping force generated by the mechanical brake motor 14 is determined according to the current and the number of rotations of the mechanical brake motor 14. When the clamping force generated by the mechanical brake motor 14 rises and reaches a preset clamping force threshold, the parking motor 1 is controlled to start and rotate in the first direction, driving the ratchet cover 3 to rotate until the first limit unit 52 is triggered and the current monitoring unit detects the first preset resistance peak of the current of the parking motor 1. The mechanical brake motor 14 is controlled to rotate slowly in the second direction at a first speed, which is a first threshold. If the brake current monitoring unit detects that the current of the mechanical brake motor 14 has a preset meshing fluctuation change, and any pawl 2 in the plurality of pawls 2 triggers the target limit unit corresponding to the second limit unit 51, it is determined that the pawl 2 corresponding to the target limit unit or the plurality of pawls 2 is successfully meshed with the ratchet 3. At this time, the mechanical brake motor 14 and the parking motor 1 are both stopped from the current work. When the first limit unit 52 remains in the triggered state for a first preset time, and the second limit unit 51 remains in the triggered state for a second preset time, it is determined that the parking lock is successful.
[0036] The parking lock release process is as follows: the parking motor 1 is started and rotates in the second direction, driving the ratchet cover 3 to rotate until the current monitoring unit detects the second preset resistance peak of the current of the parking motor 1. The mechanical brake motor 14 is controlled to rotate in the first direction. If the first limit unit 52 is triggered and the second limit unit 51 is triggered, the mechanical brake motor 14 and the parking motor 1 are controlled to stop the current work. When the first limit unit 52 remains in the triggered state for a first preset time, and the second limit unit 51 remains in the triggered state for a second preset time, it is determined that the parking lock state is successfully unlocked.
[0037] In some embodiments, the monitoring data of the clamping force monitoring unit can detect the operation of the mechanical brake motor 14, timely monitor the abnormal condition of the mechanical brake motor 14, monitor the current condition of the parking motor 1 through the current monitoring unit, detect the abnormality of the parking motor 1 or predict the failure problem of the parking motor 1 through the current, detect whether the running state of the ratchet cover 3 is normal through the position detection data of the first limiting unit 52, and detect whether the running state of the pawl 2 is normal through the position monitoring data of the second limiting unit 51.
[0038] After leaving the factory or each successful maintenance, record the key parameters under several standard operations, such as the time length from starting to locking of the parking motor 1, the time length from starting to the first limiting unit 52 triggering, and the time length from starting to the second limiting unit 51 triggering in the release process as the reference value. If the above time length gradually increases, it indicates that the mechanism resistance increases, and maintenance may be needed. An early warning is given before complete failure.
[0039] The above technical solution sets the detection module, sets the monitoring unit in different places, monitors the motion of the ratchet cover 3 and the pawl 2, and monitors the current of the mechanical brake motor 14 and the parking motor 1, accurately controls the parking locking state and the release locking state, and realizes accurate monitoring, accurate positioning and prediction of faults in each link of the locking process.
[0040] In some embodiments, the base 6 is further provided with a plurality of first connecting pieces 7, and the fixed ends of the plurality of pawls 2 are rotatably connected with the plurality of first connecting pieces 7.
[0041] The parking locking mechanism further comprises a base 6, and the parking motor 1, the plurality of pawls 2, the ratchet 3 and the ratchet cover 3 are arranged on the base 6. The base 6 is fixedly provided with a plurality of first connecting pieces 7, and the plurality of pawls 2 are rotatably fixed on the plurality of first connecting pieces 7.
[0042] In some embodiments, the first connecting piece 7 can be a cylindrical piece vertically fixed on the base 6, and the fixed end of the pawl 2 is sleeved on the cylindrical piece. The plurality of first connecting pieces 7 are connected with the plurality of pawls 2 one by one.
[0043] The above technical solution rotatably connects the fixed end of the pawl 2 with the first connecting piece 7, so that the free end of the pawl 2 can rotate under the action of the ratchet cover 3.
[0044] In some embodiments, the first reset piece 8 is further provided, the base 6 is further provided with a second connecting piece 9, the fixed end of the first reset piece 8 is connected with the second connecting piece 9, and the free end of the first reset piece 8 is connected with the ratchet cover 3.
[0045] The parking lock mechanism further comprises a first reset member 8, a fixed end of the first reset member 8 being rotatably connected with the second connecting member 9, and a free end of the first reset member 8 being connected with the side wall of the ratchet cover 3. During the rotation of the ratchet cover 3, the first reset member 8 is gradually compressed and deformed to generate a return elastic force. In the parking lock state, the first reset member 8 reaches a critical state of compression in the third direction, and the return elastic force in the third direction acts on the ratchet cover 3 to apply a force to the ratchet cover 3 in a direction different from the rotation direction of the ratchet cover 3, i.e., the first direction, thereby keeping the ratchet cover 3 in a stable state of stopping rotation and preventing external impact from causing the disengagement of the engagement state of the ratchet 3 and the pawl 2, thereby improving the stability of the locked state. In the parking lock release state, the first reset member 8 changes to a critical state of compression in the fourth direction, and the return elastic force in the fourth direction acts on the ratchet cover 3 to apply a force to the ratchet cover 3 in a direction different from the rotation direction of the ratchet cover 3, i.e., the second direction, thereby keeping the ratchet cover 3 in a stable state of stopping rotation and preventing external impact from causing the engagement of the ratchet 3 and the pawl 2, thereby improving the stability of the locked release state.
[0046] In some embodiments, the second connecting member 9 can be a cylindrical member fixed vertically on the base 6, and the first reset member 8 can be a leaf spring. The length of the leaf spring is a preset length, the stiffness of the leaf spring is a preset stiffness, and the return torque of the leaf spring automatically switches during the rotation of the ratchet cover 3, thereby achieving a bidirectional holding function.
[0047] In some embodiments, the first reset member 8 comprises a plurality of leaf springs, the base 6 is provided with a plurality of second connecting members 9, the gap between the side walls of the ratchet cover 3 is provided with a connecting rod below the position where the pawl 2 penetrates, the connecting rod connects two adjacent side walls respectively, the free ends of the plurality of leaf springs are fixedly connected with the connecting rods between the plurality of side walls respectively, and the fixed ends of the plurality of leaf springs are rotatably connected with the plurality of second connecting members 9 respectively.
[0048] The above technical solution keeps the ratchet cover 3 in a non-rotating state through the first reset member 8, thereby achieving a stable state of the locked state or the locked release state.
[0049] In some embodiments, a plurality of second reset members 10 are further included, the base 6 is further provided with a plurality of third connecting members 11, the fixed ends of the plurality of second reset members 10 are connected with the plurality of third connecting members 11 one by one, and the free ends of the plurality of second reset members 10 are connected with the plurality of pawls 2 one by one.
[0050] The parking locking mechanism further comprises a second reset member 10, a fixed end of the second reset member 10 is fixed on the third connecting member 11, a free end of the second reset member 10 is connected with the free end of the pawl 2, and the second reset member 10 provides a restoring force for the pawl 2. When the ratchet cover 3 rotates in the first direction, the free end of the pawl 2 is pressed to rotate in a direction away from the ratchet 3, the free end of the pawl 2 presses the second reset member 10, and the second reset member 10 stores energy. When the ratchet cover 3 rotates in the second direction, the free end of the pawl 2 is pressed to rotate in a direction close to the ratchet 3, and the free end of the pawl 2 is kept in engagement with the ratchet 3, so that the vehicle is kept in the parking state.
[0051] In some embodiments, the second reset member 10 includes, but is not limited to, a torsion spring, a coil spring and a spiral spring.
[0052] The above technical solution simply and efficiently applies a fixed-direction force to the pawl 2 through the second reset member 10, thereby improving the stability of the parking locking mechanism.
[0053] In some embodiments, the base 6 further comprises a limiting hole 12, and the ratchet cover 3 is provided with a limiting member adapted to the limiting hole 12.
[0054] As shown in Figure 4 , the base 6 is provided with the limiting hole 12, and the bottom of the ratchet cover 3 is provided with the limiting member which is inserted into the limiting hole 12 to limit the rotation angle of the ratchet cover 3.
[0055] In some embodiments, the length of the limiting hole 12 is set according to actual needs, and the two limit positions of the limiting hole 12 correspond to the locking position and the unlocking position respectively. When the limiting member on the ratchet cover 3 reaches the locking position, the system is in the locking state, and when the limiting member on the ratchet cover 3 reaches the unlocking position, the system is in the unlocking state.
[0056] The above technical solution limits the rotation range of the ratchet cover 3 through the limiting member and the limiting hole 12, so that the position of the ratchet cover 3 is kept stable, thereby improving the stability and accuracy of the parking locking mechanism.
[0057] In some embodiments, the parking locking mechanism further comprises a housing 13, as shown in Figure 3 , the housing 13 covers the base 6, and the parking motor 1, the plurality of pawls 2, the ratchet 3, the ratchet cover 3, the first connecting member 7, the second connecting member 9, the first reset member 8 and the second reset member 10 are all arranged inside the housing 13. The housing 13 protects the internal parts from interference by external parts, thereby reducing the risk of failure of the parking locking mechanism.
[0058] Please refer to Figure 5 , according to the second aspect of the present disclosure, a control method of a parking locking mechanism is provided, comprising: S101, if the parking lock instruction is received and the clamping force generated by the mechanical brake motor 14 reaches the preset clamping force threshold, the parking motor 1 is controlled to rotate in the first direction to drive the ratchet cover 3 to rotate in the second direction, the first direction and the second direction are two opposite directions; S102, if the ratchet cover 3 rotates to reach the first preset rotation condition, the mechanical brake motor 14 is controlled to rotate in the second direction to drive the ratchet 3 to rotate in the second direction, so that the plurality of pawls 2 pass through the gap of the ratchet cover 3 and engage with the ratchet 3; S103, when the mechanical brake motor 14 rotates to reach the second preset rotation condition, the mechanical brake motor 14 and the parking motor 1 are controlled to stop rotating; S104, when the ratchet cover 3 and the plurality of pawls 2 meet the preset stable condition, it is determined that the locking is successful.
[0059] When the mechanical brake motor 14 operates and the braking process is performed, the current and the number of rotations of the mechanical brake motor 14 are monitored by the clamping force monitoring unit, so as to calculate the clamping force generated by the mechanical brake motor 14. If the clamping force reaches the preset clamping force threshold, the parking motor 1 is controlled to start and rotate in the first direction, so as to drive the ratchet cover 3 to rotate in the second direction through the output gear. The first direction can be clockwise, and the second direction can be counterclockwise. The preset clamping force threshold is determined based on the actual running state of the vehicle to meet the demand for clamping force, so that the vehicle generates sufficient braking torque under the specified braking distance and deceleration, and the vehicle is safely and reliably stopped. During the rotation of the ratchet cover 3, the plurality of pawls 2 respectively pass through the gap of the ratchet cover 3 and contact the ratchet 3 under the action of the plurality of second reset members 10. The mechanical brake motor 14 is controlled to rotate reversely to realize complete engagement of the ratchet 3 and the plurality of pawls 2 or a certain pawl 2. The mechanical brake motor 14 and the parking motor 1 stop the current work. The ratchet cover 3 maintains the current state under the action of the first reset member 8. The engagement time meets the preset stable condition, and it is determined that the locking is successful.
[0060] In some embodiments, the first preset rotation condition can be that the first limiting unit 52 is triggered, and the current of the parking motor 1 appears a first preset resistance peak value. The second preset rotation condition can be that the current of the mechanical brake motor 14 appears a preset engagement fluctuation change, and any pawl 2 of the plurality of pawls 2 corresponds to a target limiting unit 51. The preset stable condition can be that the first limiting unit 52 remains in the triggered state for a first preset time, and the second limiting unit 51 remains in the triggered state for a second preset time.
[0061] The above technical scheme controls the start and stop of the motor through strict timing logic, improves the locking precision, and can accurately detect each link of the entire locking process and accurately locate the fault.
[0062] Please refer to Figure 6 In some embodiments, comprising: S201, in response to receiving the release parking instruction, controlling the parking motor 1 to rotate in the second direction to drive the ratchet cover 3 to rotate in the first direction; S202, if the ratchet cover 3 rotates to reach the third preset rotation condition, controlling the mechanical brake motor 14 to rotate in the first direction to drive the ratchet 3 to rotate in the first direction, so that the ratchet 3 and the plurality of pawls 2 are separated through the plurality of side walls of the ratchet cover 3; S203, when the mechanical brake motor 14 rotates to reach the fourth preset rotation condition, controlling the mechanical brake motor 14 and the parking motor 1 to stop rotating.
[0063] Receiving the release parking instruction, controlling the parking motor 1 to start and rotate in the second direction, thereby driving the ratchet cover 3 to rotate in the first direction through the output gear. In the process of rotating the ratchet cover 3, the plurality of pawls 2 respectively overcome the force of the plurality of second return members 10 under the action of the ratchet cover 3, and the mechanical brake motor 14 is controlled to rotate in the positive direction, so that the ratchet 3 and the pawl 2 are separated, the pawl 2 is turned to the side wall of the ratchet cover 3, and after the ratchet cover 3 is turned to the set position, the mechanical brake motor 14 and the parking motor 1 are controlled to stop the current work, the ratchet cover 3 maintains the current state under the action of the first return member 8, and when the separation time reaches the stable separation time, it is determined that the locking state is successfully released.
[0064] In some embodiments, the third preset rotation condition can be that the current of the parking motor 1 reaches the second preset resistance peak value. The fourth preset rotation condition can be that the first limiting unit 52 is triggered, and the second limiting unit 51 corresponding to any one of the plurality of pawls 2, i.e., the target limiting unit, is triggered.
[0065] The above technical solution accurately releases the locking state by strictly controlling the start and stop of the motor through timing logic, and can detect each link of the entire locking process and accurately locate faults. Please refer to Figure 7 According to a third aspect of the present disclosure, a control device of a parking locking mechanism is provided, comprising: The first control module 100 is used for controlling the parking motor 1 to rotate in the first direction to drive the ratchet cover 3 to rotate in the second direction if the clamping force of the mechanical brake motor 14 reaches the preset clamping force threshold, the first direction and the second direction being two opposite directions; The second control module 200 is used for controlling the mechanical brake motor 14 to rotate in the second direction to drive the ratchet 3 to rotate in the second direction if the ratchet cover 3 rotates to reach the first preset rotation condition, so that the plurality of pawls 2 engage with the ratchet 3 through the gap of the ratchet cover 3; The third control module 300 is configured to control the mechanical brake motor 14 and the parking motor 1 to stop rotating when the mechanical brake motor 14 rotates to reach the second preset rotating condition. The locking module 400 is configured to determine that the locking is successful when the ratchet cover 3 and the plurality of pawls 2 meet the preset stable condition.
[0066] According to a fourth aspect of the present disclosure, a vehicle is provided, and the vehicle comprises the parking locking mechanism according to the first aspect.
[0067] In some embodiments, the device provided by the embodiments of the present disclosure has functions or includes modules that can be used to perform the methods described in the above method embodiments, and the specific implementation can refer to the description of the above method embodiments. For brevity, it will not be repeated here.
[0068] As can be seen from the above embodiments of the parking locking mechanism, the control method thereof, the control device and the vehicle provided by the present disclosure, the ratchet is arranged on the rotating shaft of the mechanical brake motor; the output gear is arranged on the rotating shaft of the parking motor, and the tooth surface that meshes with the output gear is arranged on the ratchet cover, so that the ratchet cover is driven to rotate when the parking motor rotates; the motor is used for driving, and compared with the double-stable-state electromagnet driving mode, the anti-impact performance is better, and the problem of abnormal locking can be effectively avoided. The rotating shaft of the ratchet cover and the parking motor is directly meshed and connected, the occupied space is reduced, the connection is stable, and the transmission mode is more stable. The plurality of pawls are arranged at intervals along the circumference of the ratchet, the ratchet cover includes a plurality of side walls arranged at intervals and a plurality of gaps formed by the plurality of side walls, so that during the rotation of the ratchet cover in the first direction, the free ends of the plurality of pawls are respectively engaged with the ratchet through the plurality of gaps, and during the rotation of the ratchet cover in the second direction, the free ends of the plurality of pawls are respectively separated from the ratchet through the plurality of side walls. The first direction and the second direction are two opposite directions. Multiple sets of pawls are used to achieve redundancy backup, and compared with most existing redundancy schemes, the structure size is smaller, the weight is lighter, and the cost is lower. The arrangement mode of the pawls at different positions in the circumference of the ratchet can realize the reduction of clamping force decay, the improvement of clamping force, and the control precision.
[0069] It should be noted that the above-mentioned embodiments of the present disclosure are only for description, and do not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are possible or can be advantageous.
[0070] The various embodiments herein are described in progressive manner, and the same or similar parts among the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the device, equipment and storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.
[0071] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, and the storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk.
[0072] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A parking lock mechanism, characterized by, The parking motor (1), a plurality of pawls (2), a ratchet wheel (3) and a ratchet wheel cover (4) are included. The ratchet wheel (3) is arranged on the rotating shaft of the mechanical brake motor (14). The rotating shaft of the parking motor (1) is provided with an output gear, and the ratchet wheel cover (4) is provided with a tooth surface engaged with the output gear, so that the parking motor (1) drives the ratchet wheel cover (4) to rotate when rotating. The plurality of pawls (2) are circumferentially spaced apart along the ratchet wheel (3), and the ratchet wheel cover (4) includes a plurality of spaced apart side walls and a plurality of gaps formed by the side walls, so that during rotation of the ratchet wheel cover (4) in a first direction, the free ends of the plurality of pawls (2) are engaged with the ratchet wheel (3) through the plurality of gaps, respectively, and during rotation of the ratchet wheel cover (4) in a second direction, the free ends of the plurality of pawls (2) are separated from the ratchet wheel (3) through the plurality of side walls, respectively. The first direction and the second direction are two opposite directions. Further comprising a detection module, the detection module includes a clamping force monitoring unit for monitoring the braking force of the mechanical brake motor (14), a current monitoring unit for monitoring the current of the parking motor (1), a first limiting unit (52) for limiting detection of the ratchet wheel cover (4), and a second limiting unit (51) for limiting detection of the pawl (2).
2. The parking lock mechanism according to claim 1, characterized in that Further comprising a base (6), the base (6) is provided with a plurality of first connecting pieces (7), and the fixed ends of the plurality of pawls (2) are rotatably connected with the plurality of first connecting pieces (7).
3. The parking lock mechanism of claim 1, wherein Further comprising a first reset member (8), the base (6) is further provided with a second connecting piece (9), the fixed end of the first reset member (8) is connected with the second connecting piece (9), and the free end of the first reset member (8) is connected with the ratchet wheel cover (4).
4. The parking lock mechanism according to claim 3, characterized in that Further comprising a plurality of second reset members (10), the base (6) is further provided with a plurality of third connecting pieces (11), the fixed ends of the plurality of second reset members (10) are connected with the plurality of third connecting pieces (11) one by one, and the free ends of the plurality of second reset members (10) are connected with the plurality of pawls (2) one by one.
5. The parking lock mechanism of claim 3, wherein The base (6) further comprises a limiting hole (12), and the ratchet wheel cover (4) is provided with a limiting piece adapted to the limiting hole (12).
6. The parking lock mechanism of claim 3, wherein If the parking locking instruction is received, and the clamping force generated by the mechanical brake motor (14) reaches the preset clamping force threshold, the parking motor (1) is controlled to rotate in a first direction to drive the ratchet wheel cover (4) to rotate in a second direction, and the first direction and the second direction are two opposite directions.
7. A control method of a parking lock mechanism characterized by comprising: If the ratchet wheel cover (4) rotates to reach a first preset rotation condition, the mechanical brake motor (14) is controlled to rotate in the second direction to drive the ratchet wheel (3) to rotate in the second direction, so that the plurality of pawls (2) are engaged with the ratchet wheel (3) through the gaps of the ratchet wheel cover (4). In response to the mechanical brake motor (14) rotating to a second preset rotation condition, the mechanical brake motor (14) and the parking motor (1) are controlled to stop rotating. In response to the ratchet cover (4) and the plurality of pawls (2) meeting a preset stable condition, it is determined that the locking is successful.
8. The control method according to claim 7, characterized by The method comprises: In response to receiving a release parking instruction, the parking motor (1) is controlled to rotate in the second direction to drive the ratchet cover (4) to rotate in the first direction. If the ratchet cover (4) rotates to a third preset rotation condition, the mechanical brake motor (14) is controlled to rotate in the first direction to drive the ratchet (3) to rotate in the first direction, so that the ratchet (3) and the plurality of pawls (2) are separated by the plurality of side walls of the ratchet cover (4). In response to the mechanical brake motor (14) rotating to a fourth preset rotation condition, the mechanical brake motor (14) and the parking motor (1) are controlled to stop rotating.
9. A control device for a parking lock mechanism, characterized by comprising: The method comprises: The first control module is configured to control the parking motor (1) to rotate in the first direction to drive the ratchet cover (4) to rotate in the second direction if the clamping force of the mechanical brake motor (14) reaches a preset clamping force threshold, the first direction and the second direction being opposite directions. The second control module is configured to control the mechanical brake motor (14) to rotate in the second direction to drive the ratchet (3) to rotate in the second direction if the ratchet cover (4) rotates to a first preset rotation condition, so that the plurality of pawls (2) engage with the ratchet (3) through the gap of the ratchet cover (4). The third control module is configured to control the mechanical brake motor (14) and the parking motor (1) to stop rotating in response to the mechanical brake motor (14) rotating to a second preset rotation condition. The locking module is configured to determine that the locking is successful in response to the ratchet cover (4) and the plurality of pawls (2) meeting a preset stable condition.
10. A vehicle characterized by comprising: The parking locking mechanism comprises any one of claims 1 to 6.