Electric drive axle ratchet and pawl type electronic parking test device and test method thereof

Abstract

The invention discloses an electric drive axle ratchet and pawl type electronic parking test device and a test method thereof, and relates to the field of whole vehicle test, the electric drive axle ratchet and pawl type electronic parking test device comprises a support plate, two ends of the length direction of the support plate are parallel to the wheel end direction of a to-be-detected electric drive axle; the gradient simulation device is arranged on the supporting plate and is used for adjusting the inclination angle of the supporting plate; the two rotating speed simulation devices are arranged at the two ends of the supporting plate in the length direction respectively, and the rotating speed simulation devices are used for providing rotating speed for the to-be-detected electric drive axle; the two torque simulation devices are arranged at the two ends of the supporting plate in the length direction, and the torque simulation devices are used for simulating the slope sliding torque of the to-be-detected electric drive axle during parking; and the control system is connected with the gradient simulation device, the rotating speed simulation device and the torque simulation device. The problems that a test device is insufficient in flexibility, the pitching angle is difficult to adjust accurately, and the rotating speed and torque of the output end of the electric drive axle cannot be controlled at the same time, so that the test result is unreliable are solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle tests, and particularly to a ratchet and pawl type electronic parking test device for an electric drive axle and a test method thereof. Background Art

[0002] With the popularization of new energy commercial vehicles, the application of ratchet and pawl type electronic parking systems for electric drive axles has gradually increased.

[0003] Currently, most parking test devices rely on friction disc brakes as torque control devices. However, friction disc brakes provide poor slope-holding torque stability and cannot achieve the mechanical locking function. When simulating the parking angle, only the elevation angle can be achieved, and the downhill working condition cannot be covered; the torque is indirectly controlled through the friction force of the brake, resulting in large torque fluctuations; the parking angle cannot be dynamically adjusted during the test process, limiting the comprehensiveness of the test.

[0004] In addition, traditional test devices use an overall large platform to simulate the vehicle attitude, which has problems such as insufficient flexibility, difficulty in accurately adjusting the pitch angle, and inability to simultaneously control the rotational speed and torque of the output end of the electric drive axle, resulting in unreliable test results. Summary of the Invention

[0005] The present application provides a ratchet and pawl type electronic parking test device for an electric drive axle and a test method thereof, which can solve the technical problems in the prior art, such as insufficient flexibility of the test device, difficulty in accurately adjusting the pitch angle, inability to simultaneously control the rotational speed and torque of the output end of the electric drive axle, etc., resulting in unreliable test results.

[0006] In a first aspect, an embodiment of the present application provides a ratchet and pawl type electronic parking test device for an electric drive axle, which includes:

[0007] A support plate, on which an electric drive axle installation station is provided, and both ends in the length direction of the support plate are parallel to the wheel end direction of the electric drive axle to be detected;

[0008] A slope simulation device, which is arranged on the support plate and is used to adjust the inclination angle of the support plate;

[0009] Two rotational speed simulation devices, the two rotational speed simulation devices have the same structure and are respectively arranged at both ends in the length direction of the support plate, and the rotational speed simulation device is used to provide rotational speed for the electric drive axle to be detected;

[0010] Two torque simulation devices, the two torque simulation devices have the same structure, the two torque simulation devices are arranged at both ends in the length direction of the support plate, and the two torque simulation devices are located between the two rotational speed simulation devices, and the torque simulation device is used to simulate the slope-holding torque when the electric drive axle to be detected parks;

[0011] And a control system, which is connected to the slope simulation device, the rotational speed simulation device, and the torque simulation device.

[0012] In combination with the first aspect, in an embodiment, the slope simulation device is provided with two slope simulation components having the same structure, and the two slope simulation components are arranged at both ends of the support plate along the length direction of the support plate.

[0013] In combination with the first aspect, in an embodiment, the slope simulation component includes:

[0014] A fixed base;

[0015] A support rod, one end of the support rod is arranged on the fixed base, and the other end of the support rod is hinged to the support plate;

[0016] And a height adjustment rod, both ends of the height adjustment rod in the length direction are respectively hinged to the fixed base and the support plate.

[0017] In combination with the first aspect, in an embodiment, the height adjustment rod includes:

[0018] An adjustment support rod, the adjustment support rod is rotatably arranged on the fixed base;

[0019] An adjustment rack, the adjustment rack is inserted into the adjustment support rod, and the adjustment rack is hinged to the support plate;

[0020] An adjustment gear, the adjustment gear meshes with the adjustment rack;

[0021] And an angle adjustment motor, the angle adjustment motor is arranged on the adjustment support rod, the output shaft of the angle adjustment motor is coaxially connected to the adjustment gear, and the angle adjustment motor is connected to the control system.

[0022] In combination with the first aspect, in an embodiment, the slope simulation component further includes:

[0023] An inclinometer, the inclinometer is arranged on the support plate and is connected to the control system.

[0024] In combination with the first aspect, in an embodiment, one of the torque simulation devices includes:

[0025] - A first double-shaft magnetic powder clutch, the first double-shaft magnetic powder clutch is arranged on one side of the slope simulation device;

[0026] - A first rotational speed torque sensor, the first rotational speed torque sensor is arranged on the first double-shaft magnetic powder clutch;

[0027] - The first drive shaft, one end of the first drive shaft is connected to the first double-shaft magnetic powder clutch, and the other end is used to connect to the electric drive axle to be detected;

[0028] The other torque simulation device includes:

[0029] - The second double-shaft magnetic powder clutch, which is arranged on one side of the slope simulation device;

[0030] - The second rotational speed and torque sensor, which is arranged on the second double-shaft magnetic powder clutch;

[0031] - The second drive shaft, one end of the second drive shaft is connected to the second double-shaft magnetic powder clutch, and the other end is used to connect to the electric drive axle to be detected.

[0032] Combined with the first aspect, in an embodiment, one rotational speed simulation device includes:

[0033] - The first drive motor, which is arranged on the side of the first double-shaft magnetic powder clutch away from the slope simulation device, and is connected to the first double-shaft magnetic powder clutch through a third drive shaft;

[0034] The other rotational speed simulation device includes:

[0035] - The second drive motor, which is arranged on the side of the second double-shaft magnetic powder clutch away from the slope simulation device, and is connected to the second double-shaft magnetic powder clutch through a fourth drive shaft.

[0036] Combined with the first aspect, in an embodiment, an electric drive axle ratchet and pawl type electronic parking test device further includes:

[0037] The mounting pressing plate, which is arranged on the surface of the support plate, and an electric drive axle mounting station is formed between the mounting pressing plate and the surface of the support plate.

[0038] In the second aspect, an embodiment of the present application provides an electric drive axle ratchet and pawl type electronic parking test method, using the electric drive axle ratchet and pawl type electronic parking test device according to any one of the above claims 1-8, which includes:

[0039] Install the electric drive axle to be detected with a ratchet and pawl type electronic parking mechanism onto the electric drive axle mounting station, and adjust the angle through the slope simulation device to simulate the parking state of the electric drive axle to be detected on an uphill or downhill;

[0040] Calculate the test torque according to the parking angle of the electric drive axle to be detected, and set the test torque in the torque simulation device;

[0041] The control system drives the rotation speed simulation device to start, sets the test rotation speed and test torque. The driving direction of the rotation speed simulation device is the direction of backward slipping when parking on an uphill slope, and parking simulation is carried out. Then, the driving direction of the rotation speed simulation device is changed to the direction of backward slipping when parking on a downhill slope, and simulated slipping is carried out;

[0042] The control system drives the torque simulation device to provide test torque for the electric drive axle to be detected, so as to carry out ramp parking simulation;

[0043] Repeat the established number of test times, and record the parking angle of the slope simulation device, the rotation speeds of both wheel ends of the electric drive axle to be detected, and the number of working times of the ratchet and pawl type electronic parking mechanism;

[0044] If the rotation speeds of both wheel ends of the electric drive axle to be detected are 0 after the ratchet and pawl type electronic parking mechanism of the axle is started, the performance of the ratchet and pawl type electronic parking mechanism of the axle is qualified; if the rotation speeds of both wheel ends of the electric drive axle to be detected are not 0 after the ratchet and pawl type electronic parking mechanism of the axle is started, the performance of the ratchet and pawl type electronic parking mechanism of the axle is unqualified.

[0045] Combined with the second aspect, in an embodiment, an electric drive axle ratchet and pawl type electronic parking test method further includes:

[0046] Install the electric drive axle to be detected with the ratchet and pawl type electronic parking mechanism on the electric drive axle installation station;

[0047] Start the rotation speed simulation device, set the driving direction of the rotation speed simulation device to the direction of backward slipping when parking on an uphill slope, and repeat the established number of test times for the parking and unlocking operations of the ratchet and pawl type electronic parking mechanism;

[0048] Switch the driving direction of the rotation speed simulation device to the direction of backward slipping when parking on a downhill slope, and repeat the established number of test times for the parking and unlocking operations of the ratchet and pawl type electronic parking mechanism;

[0049] Record the parking angle of the slope simulation device, the rotation speeds of both wheel ends of the electric drive axle to be detected, and the number of working times of the ratchet and pawl type electronic parking mechanism.

[0050] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include:

[0051] By placing the electric drive axle to be tested on the electric drive axle installation station and using the slope simulation device to adjust the inclination angle of the support plate, the state of the electric drive axle to be tested when going uphill or downhill is simulated; the control system activates the rotational speed simulation device to provide a relatively low rotational speed to the electric drive axle to be tested from the wheel ends on both sides of the electric drive axle to be tested, thereby simulating the state of the vehicle coasting on a slope. Then, the torque simulation device provides a test torque to the electric drive axle to be tested, simulating the slope torque generated after the ratchet and pawl electronic parking mechanism on the electric drive axle to be tested is parked. After the ratchet and pawl electronic parking mechanism in the electric drive axle to be tested is activated, the rotational speed simulation device continuously provides rotational speed. By detecting whether the speed of the wheel end of the electric drive axle to be tested is 0, that is, whether the vehicle coasting on the slope can be locked under this slope torque, the working performance of the electric drive axle to be tested is tested, solving the problems of insufficient flexibility of the test device, difficulty in accurately adjusting the pitch angle, and inability to simultaneously control the rotational speed and torque of the output end of the electric drive axle, resulting in unreliable test results. Brief Description of the Drawings

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0053] Figure 1 It is a schematic structural diagram of a ratchet and pawl type electronic parking test device for an electric drive axle in the present application;

[0054] Figure 2 It is a schematic structural diagram of a single slope simulation component in the present application;

[0055] In the figure: 1, support plate; 11, pressing plate; 12, angle gauge; 2, slope simulation device; 21, fixed base; 22, support rod; 23, adjusting support rod; 24, adjusting rack; 25, adjusting gear; 3, rotational speed simulation device; 31, first driving motor; 311, third transmission shaft; 32, second driving motor; 321, fourth transmission shaft; 4, torque simulation device; 41, first double-shaft magnetic particle clutch; 411, first rotational speed and torque sensor; 412, first transmission shaft; 42, second double-shaft magnetic particle clutch; 421, second rotational speed and torque sensor; 422, second transmission shaft; 5, control system; 6, electric drive axle to be tested; 61, ratchet and pawl electronic parking mechanism. Detailed Description of the Embodiments

[0056] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0057] The embodiments of this application provide an electric drive axle ratchet and pawl type electronic parking test device and its test method, which can solve the problems of insufficient flexibility of the test device, difficulty in accurately adjusting the pitch angle, inability to simultaneously control the rotational speed and torque of the output end of the electric drive axle, etc., resulting in unreliable test results.

[0058] To better understand an electric drive axle ratchet and pawl type electronic parking test device and its test method proposed in this application, when a vehicle slips on a slope in actual situations, the vehicle will move at a low speed on the slope. At this time, there is a relatively low rotational speed at the wheel end of the electric drive axle of the vehicle. During the actual parking process, the ratchet and pawl electronic parking mechanism 61 on the electric drive axle is activated, and the shaft teeth of the electric drive axle are locked by the ratchet and pawl electronic parking mechanism 61. The ratchet and pawl electronic parking mechanism 61 provides a parking torque for the wheel end of the electric drive axle. The parking torque is greater than or equal to the slope slipping torque when the wheel end of the electric drive axle rotates, so that the rotational speed of the wheel end of the electric drive axle is 0, and slope parking can be achieved.

[0059] Refer to Figure 1 , an electric drive axle ratchet and pawl type electronic parking test device disclosed in this application includes a support plate 1, a slope simulation device 2, a rotational speed simulation device 3, a torque simulation device 4, and a control system 5. An electric drive axle installation station is provided on the support plate 1 to enable the electric drive axle 6 to be tested with a ratchet and pawl electronic parking mechanism 61 installed thereon to be stably installed on the support plate 1 for subsequent tests. The slope simulation device 2 is arranged on the support plate 1 and is used to adjust the inclination angle of the support plate 1, thereby simulating the inclined state of the electric drive axle 6 to be tested on a slope. There are two sets of rotational speed simulation devices 3, and the two rotational speed simulation devices 3 are respectively arranged at both ends of the support plate 1 in the length direction to provide test rotational speeds for the electric drive axle 6 to be tested from both ends. There are two sets of torque simulation devices 4, and the torque simulation devices 4 are arranged between the slope simulation device 2 and the two rotational speed simulation devices 3 to provide a test torque for the electric drive axle 6 to be tested to simulate the slope slipping torque when the electric drive axle 6 to be tested parks. The control system 5 is simultaneously connected to the slope simulation device 2, the rotational speed simulation device 3, and the torque simulation device 4.

[0060] Before the test starts, the operator calculates the theoretical rollback torque generated by the electric drive axle 6 to be tested at each parking angle according to the product parameters of the ratchet and pawl electronic parking mechanism 61 on the electric drive axle 6 to be tested. At the start of the test, the control system 5 can first control the slope simulation device 2 to start, so that the electric drive axle 6 to be tested is at the slope angle required for the test, simulating the state of the vehicle at this slope angle; the control system 5 turns on the speed simulation device 3 to provide a low speed for the electric drive axle 6 to be tested from both sides of the electric drive axle 6 to be tested, thereby simulating the state of the vehicle rolling back on the slope, and then provides a test torque for the electric drive axle 6 to be tested through the torque simulation device 4. The test torque corresponds to the theoretical rollback torque at this parking angle to simulate the rollback torque generated when the electric drive axle 6 to be tested rolls back at this slope angle. After the ratchet and pawl electronic parking mechanism 61 in the electric drive axle 6 to be tested is turned on, the speed simulation device 3 continuously provides speed, and detects whether the rotational speed of the wheel end of the electric drive axle 6 to be tested is 0. If the rotational speed of the wheel end of the electric drive axle 6 to be tested is 0 at this time, the parking torque generated by the ratchet and pawl electronic parking mechanism 61 is greater than or equal to the theoretical rollback torque, and the ratchet and pawl electronic parking mechanism 61 can normally park the wheel end of the drive axle 6 to be tested; if the rotational speed of the wheel end of the electric drive axle 6 is not 0 at this time, the parking torque generated by the ratchet and pawl electronic parking mechanism 61 is less than the theoretical rollback torque, and the ratchet and pawl electronic parking mechanism 61 cannot park the electric drive axle 6 to be tested normally. By checking whether the rotational speed of the wheel end of the electric drive axle 6 to be tested is 0, it can be judged whether the ratchet and pawl electronic parking mechanism 61 can lock the vehicle rolling back on the slope at this parking angle, and then the working performance of the electric drive axle 6 to be tested can be tested.

[0061] Refer to Figure 1 and Figure 2, the slope simulation device 2 includes two sets of slope simulation components with the same structure. The two slope simulation components are arranged at both ends of the support plate 1 along the length direction of the support plate 1 to more smoothly change the inclination angle of the support plate 1. The slope simulation component includes a fixed base 21, a support rod 22, and a height adjustment rod. During use, the fixed base 21 is placed on the ground or a special test bench, and bolts or other pressing parts can be used to place the fixed base 21 stably. One end of the support rod 22 is welded and fixed to the top surface of the fixed base 21, and the other end of the support rod 22 is hinged to the support plate 1 to facilitate the rotation of the support plate 1 on the fixed base 21. The two ends of the height adjustment rod in the length direction are respectively hinged to the fixed base 21 and the support plate 1, and the telescopic direction of the height adjustment rod is parallel to the height direction of the fixed base 21. When the length of the height adjustment rod is adjusted to be longer than that of the support rod 22, the support plate 1 can be inclined downward from the direction of the height adjustment rod towards the direction of the support rod 22. When the length of the height adjustment rod is adjusted to be shorter than that of the support rod 22, the support plate 1 can be inclined upward from the direction of the height adjustment rod towards the direction of the support rod 22, which can form an elevation angle to simulate an uphill or a depression angle to simulate a downhill. By adjusting the length of the height adjustment rod, the inclination angle of the support plate 1 can be changed, and the structure is simple, making it more convenient for the operator to control.

[0062] In an embodiment of the present application, the height adjustment rod includes an adjustment support rod 23, an adjustment rack 24, an adjustment gear 25, and an angle adjustment motor. One end of the adjustment support rod 23 is hinged to the fixed base 21. The adjustment rack 24 is inserted into the adjustment support rod 23. The end of the adjustment rack 24 extending out of the adjustment support rod 23 is hinged to the support plate 1. The angle adjustment motor is specifically selected as a reciprocating motor and is also connected to the control system 5. The angle adjustment motor is fixed to the adjustment support rod 23 by bolts, and the output shaft of the angle adjustment motor is coaxially connected to the adjustment gear 25 to drive the adjustment gear 25 to rotate reciprocally. An embedding groove is provided on the adjustment support rod 23 to enable the adjustment gear 25 to extend into the adjustment support rod 23 and mesh with the adjustment rack 24, so that when the adjustment gear 25 rotates, it can drive the adjustment gear 25 to extend out of or retract into the adjustment support rod 23, thereby adjusting the overall length of the height adjustment rod and changing the inclination angle of the support plate 1.

[0063] In order to better monitor the adjustment angle of the support plate 1 and facilitate the experimenter to flexibly adjust the test slope, the slope simulation component further includes an angle meter 12. The angle meter 12 is fixed to the opposite surfaces of the support plate 1 and the fixed base 21 by bolts and is connected to the control system 5 to transmit the inclination angle of the support plate 1 to the control system 5 in real time, facilitating the experimenter to record the test slope.

[0064] In other embodiments, the height adjustment rod can also be set as an electric telescopic rod. The fixed end of the electric telescopic rod is connected to the fixed base 21, the telescopic end of the electric telescopic rod is hinged to the support plate 1, and the electric telescopic rod is connected to the control system 5. The height adjustment is realized through the electric telescopic function, which is more convenient than the mechanical structure, but the electric telescopic rod needs to be maintained regularly. The specific setting of the height adjustment rod can be flexibly replaced according to the actual test requirements.

[0065] In order to enable the electric drive axle 6 to be detected to be fixed more stably on the support plate 1, an installation pressing plate 11 is also provided on the support plate 1. The installation pressing plate 11 is specifically fixed on the surface of the support plate 1 by bolts, and an electric drive axle installation station is formed between the installation pressing plate 11 and the support plate 1 to fix the electric drive axle 6 to be detected. In order to better simulate the actual state during vehicle rolling, the electric drive axle 6 to be detected needs the rotational speed simulation device 3 to provide a low-speed rotational speed for the wheel end of the electric drive axle 6 to be detected to simulate ramp rolling; and cooperate with the torque simulation device 4 to provide a stable test torque for the electric drive axle 6 to be detected to simulate the rolling torque generated during actual rolling. In an embodiment of the present application, the rotational speed simulation device 3 is specifically selected as a driving motor to provide a stable rotational speed for the electric drive axle 6 to be detected, and the torque simulation device 4 is specifically selected as a double-shaft magnetic particle clutch. The double-shaft magnetic particle clutch is an electromechanical device that realizes torque transmission and control based on the rheological characteristics of magnetic particles under the action of a magnetic field. Its core feature is that it has two independent input shafts and output shafts and can realize bidirectional torque transmission. The torque of the double-shaft magnetic particle clutch can be freely set, and the torque generated when the double-shaft magnetic particle clutch slips is the set torque. During the test process, the rotational speed simulation device 3 needs to continuously provide rotational speed, and the rotational speed of the electric drive axle 6 to be detected may be 0 after the ratchet and pawl electronic parking mechanism 61 is started, that is, the rotational speeds and torques at both ends of the torque simulation device 4 are not equal. Therefore, in the present application, the characteristics of the double-shaft magnetic particle clutch having two independent input shafts and output shafts, as well as its performance that the torque can be set, slips when exceeding the set torque capacity, and the torque during slipping is the set torque, can be utilized to provide a test torque for the wheel end of the electric drive axle 6 to be detected, thereby simulating the actual rolling torque generated when the whole vehicle parks on a slope at this slope angle.

[0066] Refer to Figure 1, the torque simulation device 4 includes a first double-shaft magnetic powder clutch 41 and a second double-shaft magnetic powder clutch 42. The first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42 are respectively arranged at the wheel ends on both sides of the electric drive axle 6 to be detected. A first rotational speed and torque sensor 411 is installed on the first double-shaft magnetic powder clutch 41. The first rotational speed and torque sensor 411 is arranged at one end of the first double-shaft magnetic powder clutch 41 close to the electric drive axle 6 to be detected. The first rotational speed and torque sensor 411 can record the real-time rotational speed and torque at the end of the first double-shaft magnetic powder clutch 41 close to the electric drive axle 6 to be detected, thereby reflecting the real-time rotational speed and torque at the wheel end of the electric drive axle 6 to be detected. A first transmission shaft 412 is connected to the first rotational speed and torque sensor 411. One end of the first transmission shaft 412 away from the first double-shaft magnetic powder clutch 41 is connected to the electric drive axle 6 to be detected. A second rotational speed and torque sensor 421 is installed on the second double-shaft magnetic powder clutch 42. The second rotational speed and torque sensor 421 is also arranged at one end of the second double-shaft magnetic powder clutch 42 close to the electric drive axle 6 to be detected. The second rotational speed and torque sensor 421 can record the real-time rotational speed and torque of the second double-shaft magnetic powder clutch 42. A second transmission shaft 422 is connected to the second rotational speed and torque sensor 421. One end of the second transmission shaft 422 away from the second double-shaft magnetic powder clutch 42 is connected to the electric drive axle 6 to be detected.

[0067] The rotational speed simulation device 3 includes a first driving motor 31 and a second driving motor 32. The first driving motor 31 is arranged on the side of the first double-shaft magnetic powder clutch 41 away from the electric drive axle 6 to be detected. The first driving motor 31 and the first double-shaft magnetic powder clutch 41 are connected by a third transmission shaft 311. The second driving motor 32 is arranged on the side of the second double-shaft magnetic powder clutch 42 away from the electric drive axle 6 to be detected, and the second driving motor 32 and the second double-shaft magnetic powder clutch 42 are connected by a fourth transmission shaft 321.

[0068] When simulating the coasting process of the electric drive axle 6 to be detected, the control system 5 turns on the first driving motor 31 and the second driving motor 32. At this time, the first driving motor 31 transmits rotational speed towards the first double-shaft magnetic powder clutch 41 through the third transmission shaft 311. At this time, the second driving motor 32 transmits rotational speed towards the second double-shaft magnetic powder clutch 42 through the fourth transmission shaft 321, and then provides rotational speed to the wheel ends of the electric drive axle 6 to be detected. At this time, the ratchet and pawl type parking device on the electric drive axle 6 to be detected does not work to simulate the sliding when the vehicle is coasting.

[0069] Then, the control system 5 activates the ratchet-pawl electronic parking mechanism 61 on the electric drive axle 6 to be tested, as well as the first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42. The first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42 are preset with a test torque. After the ratchet-pawl electronic parking mechanism 61 is activated, the first rotational speed and torque sensor 411 and the second rotational speed and torque sensor 421 transmit the rotational speed and torque of the first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42 on both sides of the wheel ends of the electric drive axle 6 to be tested to the control system 5 in real time. After the ratchet-pawl electronic parking mechanism 61 is activated, at this time, the first drive motor 31 and the second drive motor 32 always provide rotational speed to the first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42. If the rotational speeds at both wheel ends of the electric drive axle 6 to be tested drop to 0, at this time, the first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42 are in a slipping state, and the parking torque provided by the ratchet-pawl electronic parking mechanism 61 is greater than or equal to the test torque, then the performance of the ratchet-pawl electronic parking mechanism 61 of the electric drive axle 6 to be tested is qualified and can complete the parking at this ramp angle; if the rotational speeds at both wheel ends of the electric drive axle 6 to be tested are not 0, then the parking torque provided by the ratchet-pawl electronic parking mechanism 61 is less than the test torque, and the performance of the ratchet-pawl electronic parking mechanism 61 of the electric drive axle 6 to be tested is unqualified and cannot complete the parking at this ramp angle.

[0070] An electric drive axle ratchet-pawl type electronic parking test method proposed based on this application includes the following test steps:

[0071] S1: Calculate the test torque according to the parking angle of the electric drive axle 6 to be tested;

[0072] S2: Adjust the angle through the slope simulation device 2 and set the test torque capacity in the first double-shaft magnetic powder clutch 41 and the second double-shaft magnetic powder clutch 42. If the electric drive axle 6 to be tested has multiple gears, shift to the first gear;

[0073] S3: Install the electric drive axle 6 to be tested on the electric drive axle installation station and fill lubricating oil according to the specified model and oil quantity. Input the test rotational speed through the rotational speed simulation device 3, usually not exceeding the vehicle speed of 6 km / h, to simulate the low-speed vehicle speed during vehicle rollback.

[0074] S4: The control system 5 controls the first drive motor 31 and the second drive motor 32 to be in the driving state, with the direction being the direction of vehicle rollback when parking uphill. Shift the gear to the P gear (parking gear), hold for one minute, confirm the parking performance, shift to the D gear (automatic gear), confirm that the ratchet-pawl electronic parking mechanism 61 in the P gear is unlocked, and repeat the parking 50 times.

[0075] S5: The control system 5 controls the first drive motor 31 and the second drive motor 32 to be in the driving state, in the direction of the vehicle slipping downhill when parking on a slope, shifts the gear to the P gear (parking gear), holds for one minute, and detects the rotational speeds of the wheel ends on both sides of the to-be-tested electric drive axle 6 through the first rotational speed and torque sensor 411 and the second rotational speed and torque sensor 421 to confirm the parking performance, then shifts to the D gear (automatic gear), confirms that the P gear ratchet and pawl electronic parking mechanism 61 is unlocked, and repeats the parking 50 times.

[0076] S6: Through the control system 5, collect the real-time torques of the first bi-axial magnetic particle clutch 41 and the second bi-axial magnetic particle clutch 42 in the first rotational speed and torque sensor 411 and the second rotational speed and torque sensor 421, collect the parking angles of the first slope simulation device 2 and the second slope simulation device 2, record the number of times the electronic parking mechanism operates, and thus test the working performance of the ratchet and pawl electronic parking mechanism 61 on the to-be-tested electric drive axle 6.

[0077] Meanwhile, using an electric drive axle ratchet and pawl type electronic parking test device proposed in this application can also be used to detect the durability of the ratchet and pawl electronic parking mechanism 61 on the to-be-tested electric drive axle 6, which specifically includes the following steps:

[0078] S1: Calculate the test torque according to the parking angle of the to-be-tested electric drive axle 6.

[0079] S2: Adjust the ramp angle through the slope simulation device 2, and set the test torque in the first bi-axial magnetic particle clutch 41 and the second bi-axial magnetic particle clutch 42 to the theoretical slipping slope torque. If the to-be-tested electric drive axle 6 has multiple gears, shift to the first gear.

[0080] S3: Install the to-be-tested electric drive axle 6 on the electric drive axle installation station, and fill lubricating oil according to the specified model and oil volume. Input the test rotational speed through the rotational speed simulation device 3, usually not exceeding the vehicle speed of 6 km / h to simulate the slipping vehicle speed.

[0081] S4: The control system 5 controls the first drive motor 31 and the second drive motor 32 to be in the driving state, in the direction of the vehicle slipping downhill when parking on an uphill slope, gives the test rotational speed and test torque, and performs the established test number of times, for example, repeats the parking action 1000 times, and each time the parking stays for 6 s, with an interval of 4 s between every two parkings.

[0082] S5: The control system 5 controls the first drive motor 31 and the second drive motor 32 to be in the driving state, in the direction of the vehicle slipping downhill when parking on a slope, gives the test rotational speed and test torque, and also performs the number of times 1000 times, each time the parking stays for 6 s, with an interval of 4 s between every two parkings.

[0083] S6: Steps S4 and S5 form a loop, which is cycled a set number of times according to the requirements of a specific test. For example, 15 cycles can be set.

[0084] S7: Through the control system 5, collect the real-time rotational speed and real-time torque of the first rotational speed torque sensor 411 and the second rotational speed torque sensor 421, collect the parking angle of the slope simulation device 2, and record the number of times the electronic parking mechanism operates to verify the durability of the ratchet and pawl electronic parking mechanism 61 on the electric drive axle 6 to be tested.

[0085] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0086] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0087] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An electric drive axle ratchet and pawl type electronic parking test device, characterized in that, It includes: A support plate (1), on which an installation station for an electric drive axle is provided, and the two ends in the length direction of the support plate are parallel to the wheel end direction of the electric drive axle (6) to be detected; A slope simulation device (2), which is arranged on the support plate (1) and is used to adjust the inclination angle of the support plate (1); Two rotational speed simulation devices (3), the two rotational speed simulation devices (3) have the same structure and are respectively arranged at the two ends in the length direction of the support plate (1), and the rotational speed simulation device (3) is used to provide rotational speed for the electric drive axle (6) to be detected; Two torque simulation devices (4), the two torque simulation devices (4) have the same structure, are arranged at the two ends in the length direction of the support plate (1), and the two torque simulation devices (4) are located between the two rotational speed simulation devices (3), and the torque simulation device (4) is used to simulate the rolling torque when the electric drive axle (6) to be detected is parked; And a control system (5), the control system (5) is connected to the slope simulation device (2), the rotational speed simulation device (3) and the torque simulation device (4).

2. The ratchet and pawl type electronic parking test device for an electric drive axle according to claim 1, characterized in that: The slope simulation device (2) is provided with two sets of slope simulation components with the same structure, and the two slope simulation components are arranged at the two ends of the support plate (1) along the length direction of the support plate (1).

3. The ratchet and pawl type electronic parking test device for an electric drive axle according to claim 2, characterized in that The slope simulation component includes: A fixed base (21); A support rod (22), one end of the support rod (22) is arranged on the fixed base (21), and the other end of the support rod (22) is hinged to the support plate (1); And a height adjustment rod, the two ends in the length direction of the height adjustment rod are respectively hinged to the fixed base (21) and the support plate (1).

4. An electric drive axle ratchet and pawl type electronic parking test device according to claim 3, characterized in that, The height adjustment rod includes: An adjustment support rod (23), the adjustment support rod (23) is rotatably arranged on the fixed base (21); An adjustment rack (24), the adjustment rack (24) is inserted into the adjustment support rod (23), and the adjustment rack (24) is hinged to the support plate (1); An adjustment gear (25), the adjustment gear (25) meshes with the adjustment rack (24); And an angle adjustment motor, the angle adjustment motor is arranged on the adjustment support rod (23), the output shaft of the angle adjustment motor is coaxially connected to the adjustment gear (25), and the angle adjustment motor is connected to the control system (5).

5. An electric drive axle ratchet and pawl type electronic parking test device according to claim 3, characterized in that, The slope simulation component further includes: An angle meter (12), which is arranged on the support plate (1) and is connected to the control system (5).

6. The ratchet and pawl type electronic parking test device for an electric drive axle according to claim 1, wherein, One of the torque simulation devices (4) includes: - A first double-shaft magnetic powder clutch (41), the first double-shaft magnetic powder clutch (41) is arranged on one side of the slope simulation device (2); - The first rotational speed torque sensor (411), and the first rotational speed torque sensor (411) is arranged on the first double-shaft magnetic powder clutch (41); - The first transmission shaft (412), one end of the first transmission shaft (412) is connected to the first double-shaft magnetic powder clutch (41), and the other end is used for connecting the electric drive axle (6) to be detected; Another said torque simulation device (4) includes: - The second double-shaft magnetic powder clutch (42), and the second double-shaft magnetic powder clutch (42) is arranged on one side of the gradient simulation device (2); - The second rotational speed torque sensor (421), and the second rotational speed torque sensor (421) is arranged on the second double-shaft magnetic powder clutch (42); - The second transmission shaft (422), one end of the second transmission shaft (422) is connected to the second double-shaft magnetic powder clutch (42), and the other end is used for connecting the electric drive axle (6) to be detected.

7. An electric drive axle ratchet and pawl type electronic parking test device according to claim 6, characterized in that, One said rotational speed simulation device (3) includes: - The first driving motor (31), the first driving motor (31) is arranged on the side of the first double-shaft magnetic powder clutch (41) away from the gradient simulation device (2), and the first driving motor (31) is connected to the first double-shaft magnetic powder clutch (41) through a third transmission shaft (311); Another said rotational speed simulation device (3) includes: - The second driving motor (32), the second driving motor (32) is arranged on the side of the second double-shaft magnetic powder clutch (42) away from the gradient simulation device (2), and the second driving motor (32) is connected to the second double-shaft magnetic powder clutch (42) through a fourth transmission shaft (321).

8. The ratchet and pawl type electronic parking test device for an electric drive axle according to claim 1, characterized in that, It further includes: The mounting pressing plate (11), the mounting pressing plate (11) is arranged on the surface of the support plate (1), and an electric drive axle mounting station is formed between the mounting pressing plate (11) and the surface of the support plate (1).

9. An electronic parking test method for an electric drive axle with ratchet and pawl, characterized in that, When using an electric drive axle ratchet and pawl type electronic parking test device according to any one of claims 1-8 above, it includes: Install the electric drive axle (6) to be detected with a ratchet and pawl type electronic parking mechanism (61) onto the electric drive axle mounting station, and adjust the angle through the gradient simulation device (2) to simulate the parking state of the electric drive axle (6) to be detected on an uphill or the parking state on a downhill; Calculate the test torque according to the parking angle of the electric drive axle (6) to be detected, and set the test torque in the torque simulation device (4); The control system (5) drives the rotational speed simulation device (3) to start, gives the test rotational speed and the test torque, the driving direction of the rotational speed simulation device (3) is the direction of downward vehicle roll when parking uphill, conducts parking simulation, and then changes the driving direction of the rotational speed simulation device (3) to the direction of downward vehicle roll when parking downhill to conduct simulated vehicle roll; The control system (5) drives the torque simulation device (4) to provide the test torque for the electric drive axle (6) to be detected to conduct ramp parking simulation; Repeat the established number of tests, and record the parking angle of the slope simulation device (2), the rotational speeds of the wheel ends on both sides of the electric drive axle (6) to be tested, and the number of operations of the ratchet and pawl type electronic parking mechanism (61). If the rotational speeds of the wheel ends on both sides of the electric drive axle (6) to be tested are 0 after the ratchet and pawl type electronic parking mechanism (61) of the axle is activated, the performance of the ratchet and pawl type electronic parking mechanism (61) of the axle is qualified; if the rotational speeds of the wheel ends on both sides of the electric drive axle (6) to be tested are not 0 after the ratchet and pawl type electronic parking mechanism (61) of the axle is activated, the performance of the ratchet and pawl type electronic parking mechanism (61) of the axle is unqualified.

10. A ratchet and pawl type electronic parking test method for an electric drive axle according to claim 9, characterized in that It further includes: Install the electric drive axle (6) with the ratchet and pawl type electronic parking mechanism (61) to be tested onto the electric drive axle installation station; Activate the rotational speed simulation device (3), set the driving direction of the rotational speed simulation device (3) to the direction of downward slipping when parking uphill, and repeat the established number of tests for the parking and unlocking operations of the ratchet and pawl type electronic parking mechanism (61); Switch the driving direction of the rotational speed simulation device (3) to the direction of downward slipping when parking downhill, and repeat the established number of tests for the parking and unlocking operations of the ratchet and pawl type electronic parking mechanism (61); Record the parking angle of the slope simulation device (2), the rotational speeds of the wheel ends on both sides of the electric drive axle (6) to be tested, and the number of operations of the ratchet and pawl type electronic parking mechanism (61).

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