Control method for adjusting height of driving motor according to vehicle load change and vehicle

Abstract

The application provides a control method for adjusting the height of a driving motor according to the change of the load of a vehicle and a vehicle, which controls the height of a controllable vibration isolation device between the driving motor and the frame to keep the driving motor and the driving axle at the same height; the relative relationship between the load of the vehicle and the height of the vibration isolation device to which the vibration isolation device should be adjusted to keep the driving motor and the driving axle at the same height is determined in advance, then the load of the vehicle is detected, the vibration isolation device is controlled to extend or contract according to the determined relative relationship, the height difference between the driving motor and the driving axle is adjusted, and the driving motor and the driving axle are kept at the same height, so that the problem of the vibration and noise in the vehicle caused by the fact that the driving motor, the transmission shaft and the driving axle are not at the same axis and there is an angle among the three in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more particularly to a control method and a vehicle for adjusting the height of a drive motor according to changes in vehicle load. Background Technology

[0002] The drive motor is a crucial component of the power system in new energy buses. The chassis of new energy buses typically employs a configuration of drive motor + drive shaft + leaf springs, such as... Figure 1 As shown, the drive motor 11 and leaf spring 14 are fixed to the frame. One end of the drive shaft 12 is connected to the drive axle 13 fixed to the wheel axle 19, and the other end is connected to the drive motor 11. During bus operation, the drive motor 11 may vibrate under different road conditions, which can lead to malfunctions in severe cases, affecting comfort and overall vehicle operation. Therefore, existing technologies use vibration isolation devices to reduce the vibration of the drive motor 11, such as... Figure 4 One type of vibration isolation structure is a rubber vibration isolation structure in which the drive motor 11 is connected to the frame 17 through a rubber vibration isolation 18. Vibration is reduced by installing the rubber vibration isolation 18 at the bottom of the drive motor 11. Another type of vibration isolation structure is a passive hydraulic suspension with an equivalent mechanical structure provided by Chinese invention patent with announcement number CN103671686B. The dual fluid medium formed by the air spring and the hydraulic flow damping can provide synergistic vibration isolation for the drive motor, reduce the vibration of the drive motor, and improve the overall vehicle comfort.

[0003] However, as the load on the bus changes, the frame will deform to varying degrees depending on the load, such as... Figure 2 As shown, when the vehicle is fully loaded, the entire frame sinks. Since the two ends of the leaf spring 14 are fixed to the frame, the leaf spring 14 is in a flattened state. The design generally ensures that the drive motor 11, drive shaft 12, and drive axle 13 are on the same straight line under full load. Figure 3 As shown, in the unloaded state, the vehicle body is raised as a whole. At this time, the leaf spring 14 is in a bent state. Since the deformation of the wheel axle 19 is small, it is assumed that the position of the drive axle 13 has not changed. However, the actual height of the drive motor 11 and the drive shaft 12 is raised. There is an angle between the drive axle 13, the drive shaft 12 and the drive motor 11. When there is an angle between the drive motor 11, the drive shaft 12 and the drive axle 13, the power torque output will produce speed fluctuations and torque fluctuations. The larger the angle, the larger the fluctuation amplitude. Speed ​​fluctuations and torque fluctuations will cause vibration inside the vehicle, generate noise and reduce the comfort of the bus. Summary of the Invention

[0004] The purpose of this invention is to provide a control method for adjusting the height of the drive motor according to changes in vehicle load, so as to solve the problem in the prior art where the drive motor, drive shaft and drive axle are not on the same axis due to different vehicle loads, and the angle between the three causes vibration and noise in the vehicle. The purpose of this invention is also to provide a vehicle that adjusts the height of the drive motor according to changes in vehicle load, so as to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides a control method for adjusting the height of the drive motor according to changes in vehicle load. The vibration isolation device between the drive motor and the vehicle frame is a controlled telescopic vibration isolation device. The relative relationship between the vehicle load and the height of the vibration isolation device is predetermined, under the premise that the drive motor and the drive axle are always at the same height. The vehicle load is detected, and the control system controls the telescopic extension and retraction of the vibration isolation device according to the vehicle load and the aforementioned relative relationship, thereby adjusting the height of the drive motor to be at the same height as the drive axle.

[0006] Furthermore, the vehicle's load capacity can be detected by measuring the stress value of the leaf springs.

[0007] Furthermore, strain gauges are attached to the leaf spring to detect its stress value, and the strain gauges are connected to the control system.

[0008] Furthermore, keeping the height of the vibration isolation device constant, the stress value of the leaf spring and the required height of the vibration isolation device when the drive axle and drive motor are kept at the same height are determined under different load conditions, such as when the vehicle is unloaded, fully loaded, and between unloaded and fully loaded. A relationship curve is formed by fitting the stress value of the leaf spring and the corresponding required height of the vibration isolation device, which is used as the relative relationship.

[0009] Furthermore, the vibration isolation device is equipped with a height sensor to detect the real-time height of the vibration isolation device and thus determine the difference between the real-time height and the required height.

[0010] Furthermore, this is performed when the vehicle is in drive.

[0011] Furthermore, the controlled telescopic vibration isolation device includes a support partition and upper and lower supports installed on the upper and lower sides of the support partition. The lower support is fixedly connected to the support partition, and the upper support is guided and movably installed on the support partition in the vertical direction. A lifting adjustment bladder is provided between the upper support and the support partition, and a damping bladder is also provided between the upper support and the support partition. The damping bladder is connected to a buffer bladder. When the relative height between the upper support and the support partition changes, the buffer bladder replenishes the buffer medium into the damping bladder or retracts the buffer medium in the damping bladder through the buffer bladder.

[0012] Furthermore, the guide structure between the upper support and the support partition is set inside the lifting adjustment bladder or the vibration damping bladder.

[0013] Furthermore, the lifting adjustment bladder is a lifting air bladder, while the shock-absorbing bladder and the buffer bladder are both oil bladders, with the lifting adjustment bladder located in the middle of the shock-absorbing bladder.

[0014] Furthermore, there is a receiving space between the lower support and the supporting partition, and the buffer bladder is disposed within this receiving space.

[0015] Furthermore, the lower support has a basin-type structure, and the basin opening is fixedly connected to the support partition, forming the aforementioned accommodating space within the basin's inner cavity.

[0016] Furthermore, the opening of the buffer bladder is sealed to the lower side of the support partition, and the support partition is provided with a connecting structure to realize the connection between the shock-absorbing bladder and the buffer bladder.

[0017] Furthermore, the connecting structure is a throttling damping structure.

[0018] Furthermore, the connecting structure is a throttle valve.

[0019] Furthermore, the throttle valve is an electrically controlled valve, which can adjust the opening degree.

[0020] Furthermore, the support partition is provided with a through hole, and the throttle valve includes a valve body connected to the through hole on the support partition. The valve body has a valve body cavity communicating with the through hole, and the valve body cavity is connected with valve ports of different diameters. The valve core in the valve body cavity opens different valve ports at different positions so as to communicate with the through hole.

[0021] Furthermore, both the vibration damping bladder and the buffer bladder are circular bladders with multiple interconnected structures, which are evenly arranged around the circumference.

[0022] Furthermore, both the support partition and the upper bracket are circular, and the two ends of the shock-absorbing bladder and the two ends of the lifting adjustment bladder are respectively sealed to the upper bracket and the support partition.

[0023] Furthermore, the upper support is a basin-type support with the rim facing downwards. The side wall edge of the upper support is folded back to form an installation ring groove with the opening facing upwards. The edge of the support partition is folded back to form an installation ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the installation ring grooves at the edge of the upper support and the edge of the support partition, respectively, and are fixed and sealed.

[0024] Furthermore, the lower side of the upper bracket has an outward-facing mounting ring groove near the center, and the support partition has an upward-extending connecting pipe section near the center. The top edge of the connecting pipe section is folded back to form a downward-facing mounting ring groove. The two ends of the lifting adjustment bladder extend into the mounting ring grooves at the center of the upper bracket and the top of the connecting pipe section, respectively, and are fixed and sealed.

[0025] Beneficial effects: This invention provides a pioneering control method for adjusting the height of the drive motor according to changes in vehicle load. The method involves controlling the height of a controllable, retractable vibration isolation device between the drive motor and the vehicle frame to maintain the drive motor and drive axle at the same height. A pre-determined relationship is established between the vehicle load and the height to which the vibration isolation device should be adjusted to maintain the same height for both the drive motor and drive axle. The vehicle load is then detected, and the vibration isolation device is extended or retracted according to the pre-determined relationship to adjust the height difference between the drive motor and drive axle, ensuring they remain at the same height. This invention solves the problem of in-vehicle vibration and noise caused by the drive motor, drive shaft, and drive axle not being on the same axis and thus having an angle when the vehicle is under different loads.

[0026] This invention provides a vehicle that adjusts the height of the drive motor according to changes in vehicle load. The vehicle includes a control system, and the vibration isolation device between the drive motor and the vehicle frame is a controlled telescopic vibration isolation device. The vehicle executes the following control method: A relative relationship between the vehicle load and the height of the vibration isolation device is predetermined, ensuring that the drive motor and drive axle are always at the same height, and this relationship is stored in the control system. The vehicle load is detected, and the control system, based on the vehicle load and the aforementioned relative relationship, controls the telescopic extension and retraction of the vibration isolation device to adjust the height of the drive motor so that it is at the same height as the drive axle. This control method adjusts the height of the drive motor according to measured load changes to ensure that the drive motor and drive axle are always at the same height.

[0027] Furthermore, the vehicle's load capacity can be detected by measuring the stress value of the leaf springs.

[0028] Furthermore, strain gauges are attached to the leaf spring to detect its stress value, and the strain gauges are connected to the control system.

[0029] Furthermore, keeping the height of the vibration isolation device constant, the stress value of the leaf spring and the required height of the vibration isolation device when the drive axle and drive motor are kept at the same height are determined under different load conditions, such as when the vehicle is unloaded, fully loaded, and between unloaded and fully loaded. A relationship curve is formed by fitting the stress value of the leaf spring and the corresponding required height of the vibration isolation device, which is used as the relative relationship.

[0030] Furthermore, the vibration isolation device is equipped with a height sensor to detect the real-time height of the vibration isolation device and thus determine the difference between the real-time height and the required height.

[0031] Furthermore, this is performed when the vehicle is in drive.

[0032] Furthermore, the controlled telescopic vibration isolation device includes a support partition and upper and lower supports installed on the upper and lower sides of the support partition. The lower support is fixedly connected to the support partition, and the upper support is guided and movably installed on the support partition in the vertical direction. A lifting adjustment bladder is provided between the upper support and the support partition, and a damping bladder is also provided between the upper support and the support partition. The damping bladder is connected to a buffer bladder. When the relative height between the upper support and the support partition changes, the buffer bladder replenishes the buffer medium into the damping bladder or retracts the buffer medium in the damping bladder through the buffer bladder.

[0033] Furthermore, the guide structure between the upper support and the support partition is set inside the lifting adjustment bladder or the vibration damping bladder.

[0034] Furthermore, the lifting adjustment bladder is a lifting air bladder, while the shock-absorbing bladder and the buffer bladder are both oil bladders, with the lifting adjustment bladder located in the middle of the shock-absorbing bladder.

[0035] Furthermore, there is a receiving space between the lower support and the supporting partition, and the buffer bladder is disposed within this receiving space.

[0036] Furthermore, the lower support has a basin-type structure, and the basin opening is fixedly connected to the support partition, forming the aforementioned accommodating space within the basin's inner cavity.

[0037] Furthermore, the opening of the buffer bladder is sealed to the lower side of the support partition, and the support partition is provided with a connecting structure to realize the connection between the shock-absorbing bladder and the buffer bladder.

[0038] Furthermore, the connecting structure is a throttling damping structure.

[0039] Furthermore, the connecting structure is a throttle valve.

[0040] Furthermore, the throttle valve is an electrically controlled valve, which can adjust the opening degree.

[0041] Furthermore, the support partition is provided with a through hole, and the throttle valve includes a valve body connected to the through hole on the support partition. The valve body has a valve body cavity communicating with the through hole, and the valve body cavity is connected with valve ports of different diameters. The valve core in the valve body cavity opens different valve ports at different positions so as to communicate with the through hole.

[0042] Furthermore, both the vibration damping bladder and the buffer bladder are circular bladders with multiple interconnected structures, which are evenly arranged around the circumference.

[0043] Furthermore, both the support partition and the upper bracket are circular, and the two ends of the shock-absorbing bladder and the two ends of the lifting adjustment bladder are respectively sealed to the upper bracket and the support partition.

[0044] Furthermore, the upper support is a basin-type support with the rim facing downwards. The side wall edge of the upper support is folded back to form an installation ring groove with the opening facing upwards. The edge of the support partition is folded back to form an installation ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the installation ring grooves at the edge of the upper support and the edge of the support partition, respectively, and are fixed and sealed.

[0045] Furthermore, the lower side of the upper bracket has an outward-facing mounting ring groove near the center, and the support partition has an upward-extending connecting pipe section near the center. The top edge of the connecting pipe section is folded back to form a downward-facing mounting ring groove. The two ends of the lifting adjustment bladder extend into the mounting ring grooves at the center of the upper bracket and the top of the connecting pipe section, respectively, and are fixed and sealed.

[0046] Beneficial effects: This invention innovatively provides a vehicle that adjusts the height of the drive motor according to changes in vehicle load. The vehicle employs a control method for adjusting the drive motor height based on load changes. This method controls the height of a controllable, retractable vibration isolation device between the drive motor and the vehicle frame to maintain the drive motor and drive axle at the same height. A pre-determined relationship is established between the vehicle load and the height to which the vibration isolation device should be adjusted to maintain the same height for the drive motor and drive axle. The vehicle load is then detected, and the vibration isolation device is retracted based on this predetermined relationship, adjusting the height difference between the drive motor and drive axle to maintain them at the same height. This invention provides a control method for adjusting the drive motor height based on changes in vehicle load, solving the problem in existing technologies where, under different load conditions, the drive motor, drive shaft, and drive axle are not aligned, resulting in angles that cause in-vehicle vibration and noise. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the assembly structure of a vehicle chassis transmission mechanism in the prior art; Figure 2 A front view of the chassis transmission mechanism of a vehicle under full load in the prior art; Figure 3 A front view of the chassis drive mechanism of a vehicle in the prior art under no-load conditions; Figure 4 This is a schematic diagram of the assembly structure of a drive motor that uses rubber vibration isolation in the prior art; Figure 5 This is a schematic diagram of the assembly structure of the vibration isolation device; Figure 6 This is a schematic diagram of the upper support structure of the vibration isolation device; Figure 7 This is a schematic diagram of the support diaphragm structure for the vibration isolation device; Figure 8A schematic diagram of the structure of the throttle valve of the vibration isolation device when the small-diameter channel is open; Figure 9 A schematic diagram of the structure of the throttle valve of the vibration isolation device when the large-diameter channel is open; Figure 10 This is a schematic diagram of the lower support structure of the vibration isolation device; Figure 11 A front view of the chassis transmission mechanism of a vehicle equipped with vibration isolation devices under full load. Figure 12 A front view of the chassis transmission mechanism of a vehicle equipped with vibration isolation devices in an unloaded state; Figure 13 A flowchart illustrating the logic of a control method for adjusting the height of the drive motor based on changes in vehicle load.

[0048] In the diagram: 1. Supporting partition; 101. Connecting pipe section; 2. Upper bracket; 3. Lower bracket; 4. Lifting adjustment chamber; 5. Vibration damping chamber; 6. Buffer chamber; 7. Guide structure; 71. Guide rod; 72. Guide tube; 8. Throttling valve; 81. Lead wire groove; 82. Electrically controlled valve core; 9. Mounting ring groove; 10. Height sensor; 11. Drive motor; 12. Drive shaft; 13. Drive axle; 14. Leaf spring; 15. Leaf spring mounting point; 16. Tire; 17. Frame; 18. Rubber vibration isolation; 19. Axle; 20. Fixing bolt; 21. Vibration isolation device; 22. Strain gauge; 23. Control system. Detailed Implementation

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] The principle and concept of this invention is to use a controllable telescopic vibration isolation device as a vibration isolation mechanism for the vehicle drive motor. The vibration isolation device is fixed to the vehicle frame, and the drive motor is mounted on the upper end of the vibration isolation device and connected to the drive axle mounted on the wheel axle through a transmission shaft. The height to which the vibration isolation device should be adjusted to keep the drive motor and drive axle at the same height under different vehicle load conditions is predetermined, and a mathematical model of the relative relationship between the vehicle load and the height to which the vibration isolation device should be adjusted is calculated. During vehicle operation, the load condition of the vehicle body is detected, and based on the pre-calculated mathematical model, the height to which the vibration isolation device should be adjusted is determined, and the telescopic extension of the vibration isolation device is controlled to adjust the drive motor to the same height as the drive axle.

[0051] Based on the above principles and concepts, this invention provides a control method for adjusting the height of the drive motor according to changes in vehicle load, and various embodiments thereof for further explanation.

[0052] Based on the above principles, in a basic embodiment, such as Figure 5-12The provided embodiment of the present invention provides a control method for adjusting the height of the drive motor according to changes in vehicle load. The vibration isolation device 21 between the drive motor 11 and the vehicle frame is an adjustable-length vibration isolation device. During the testing and calibration phase of the vibration isolation device 21, the vehicle body is subjected to various load conditions. The height value that the vibration isolation device 21 should maintain when keeping the drive motor 11 and drive axle 13 at the same height under the corresponding load conditions is recorded. A relationship curve is fitted based on the relative relationship between the vehicle load and the height value of the vibration isolation device 21 under different conditions. The height of the vibration isolation device 21 is adjusted according to the relationship curve, thereby adjusting the drive motor 11 and drive axle 13 to the same height. The control method for adjusting the height of the drive motor according to changes in vehicle load provided by the present invention can automatically adjust the drive motor 11 and drive axle 13 to the same height according to changes in vehicle load, solving the problem in the prior art where the vehicle frame floats up and down due to load changes, causing body vibration and noise due to the included angle between the drive motor 11 and drive axle 13.

[0053] Based on the above embodiments, in one embodiment, such as Figure 5-12 The provided embodiment detects the stress value of the leaf spring 14 under different loads on the vehicle body to reflect the vehicle's load condition; in another embodiment, a height sensor can be installed on the frame to detect the height of the frame relative to the ground, and the real-time load condition of the vehicle can be reflected by detecting the change in the height of the frame relative to the ground.

[0054] Based on the above embodiments, in one embodiment, such as Figure 5-12 In the provided embodiment, strain gauges 22 are attached to the leaf spring 14 to detect the stress value of the leaf spring 14. The strain gauges 22 are connected to the vehicle control system.

[0055] Based on the above embodiments, in one embodiment, such as Figure 5-12 In the provided embodiment, the height of the vibration isolation device 21 is kept constant. Under various load conditions, such as when the vehicle is unloaded, fully loaded, or between unloaded and fully loaded, the stress value on the leaf spring 14 and the height value that the vibration isolation device 21 needs to be adjusted to under the corresponding stress value are recorded. The stress value and the height value are fitted into a relationship curve, and this curve is used as the underlying logic curve and input into the control system as the relative relationship for controlling the extension and retraction of the vibration isolation device 21.

[0056] Based on the above embodiments, in one embodiment, such as Figure 5-12In the provided embodiment, a height sensor 10 is installed on the vibration isolation device 21 to detect the real-time height of the vibration isolation device 21. The difference between the real-time height of the vibration isolation device 21 and the height to be adjusted is reflected by detecting the real-time height of the vibration isolation device 21. In another embodiment, the height sensor 10 can also be installed on the vehicle frame, directly above the drive motor 11, to directly detect the actual height of the drive motor 11 to reflect the difference between the real-time height of the vibration isolation device 21 and the height to be adjusted.

[0057] Based on the above embodiments, in one embodiment, the control method for adjusting the height of the drive motor according to changes in vehicle load provided by the present invention is executed when the vehicle is in forward gear; in another embodiment, it is determined that the load no longer changes when the vehicle is in motion, and the control method for adjusting the height of the drive motor according to changes in vehicle load can also be executed when reverse gear is engaged.

[0058] Based on the above embodiments, in one embodiment, such as Figure 5-12 In the provided embodiment, the controllable telescopic vibration isolation device 21 is centered on the supporting partition 1. An upper support 2 is installed on the upper side of the supporting partition 1, and a lower support 3 is fixedly connected to its lower side. A vertical guide structure 7 is provided between the upper support 2 and the supporting partition 1 to allow the upper support 2 to move vertically. A lifting adjustment bladder 4 is also provided between the upper support 2 and the supporting partition 1. By filling or removing fluid media from the lifting adjustment bladder 4, the length of the lifting adjustment bladder 4 in the vertical direction is changed, controlling the vertical movement of the upper support 2. A damping bladder 5 is also provided between the upper support 2 and the supporting partition 1 to dampen vibrations. The shock absorber 5 is connected to the buffer bladder 6. When the drive motor 11 vibrates, the upper bracket 2 presses the shock absorber 5 or moves it upward, so as to reduce the vibration of the drive motor 11 by the fluid flow damping of the damping oil between the shock absorber 5 and the buffer bladder 6. When the height of the drive motor 11 is increased, the volume of the shock absorber 5 increases. Since the total volume of the damping oil in the shock absorber 5 and the buffer bladder 6 remains unchanged, the damping oil flows from the buffer bladder 6 to the shock absorber 5, so that the height of the upper bracket 2 rises slowly and steadily. When the height of the drive motor 11 is lowered, the shock absorber 5 is compressed, and the damping oil flows from the shock absorber 5 to the buffer bladder 6, so that the height of the upper bracket 2 falls slowly and steadily.

[0059] Based on the above embodiments, in one embodiment, the guide structure between the upper bracket 2 and the supporting partition 1 is a plurality of telescopic support tubes evenly arranged circumferentially on the edge of the supporting partition 1 and connected to the upper bracket 2. Each telescopic support tube includes a sleeve and a rod core. The rod core is installed inside the sleeve and moves up and down along the sleeve. One end of the sleeve is fixed to the supporting partition 1, and one end of the rod core is fixed to the upper bracket 2. The plurality of telescopic support tubes arranged along the edge of the supporting partition 1 serve as a guide structure to assist the upper bracket in moving up and down. In a more preferred embodiment, such as... Figure 5-7 In the provided embodiment, the guide structure between the upper bracket 2 and the support partition 1 includes a guide rod 71 and a guide tube 72. The guide rod 71 is inserted into the guide tube 72 and moves along the guide tube 72. The guide structure 7 is set as a whole in the lifting adjustment bladder or the vibration damping bladder. This ensures that the movement of the guide rod 71 along the guide tube 72 is not affected by the complex external environment, and avoids sand and dust from entering the guide tube 72, which would cause the guide structure 7 to not expand and contract smoothly and wear the guide rod 71.

[0060] Based on the above embodiments, in one embodiment, such as Figure 5-10 In the provided embodiment, the lifting adjustment bladder 4 is a lifting airbag, and the shock-absorbing bladder 5 and the buffer bladder 6 are oil bladders. The lifting adjustment bladder 4 is located in the middle of the shock-absorbing bladder 5. The shock-absorbing bladder 5 is fixed to the upper support 2 along the bottom edge of the upper support 2. The lifting airbag is connected to an air pump to control the volume of the inner cavity of the lifting airbag and control the lifting of the upper support 2. Since the lifting airbag is located inside the shock-absorbing bladder 5, the shock-absorbing bladder 5 and the buffer bladder 6 are filled with damping oil. Under the pressure of the damping oil, the lifting airbag can change its volume more stably in the vertical direction when it is inflated, reducing the expansion of the lifting airbag in the horizontal direction. In another embodiment, the lifting adjustment bladder 4 and the shock-absorbing bladder 5 are respectively installed on the support partition 1. The bottom of the upper support 2 is connected to the lifting adjustment bladder 4. The upper support 2 is also provided with an extension arm to connect the shock-absorbing bladder 5. The height adjustment and vibration reduction of the upper support 2 are achieved by the parallel arrangement of the lifting adjustment bladder 4 and the shock-absorbing bladder 5.

[0061] Based on the above embodiments, in one embodiment, such as Figure 5-10 In the provided embodiment, there is a certain accommodating space between the lower bracket 3 and the supporting partition 1. This accommodating space is connected to the external environment. The buffer bladder 6 is placed in this accommodating space to ensure that the buffer bladder 6 can deform freely. In another embodiment, the lower bracket 3 is only used to support the supporting partition 1, and the buffer bladder 6 and the vibration damping bladder 5 are arranged side by side on the upper surface of the supporting partition 1.

[0062] Based on the above embodiments, in one embodiment, such as Figure 5 , Figure 10In the provided embodiment, the lower support 3 is a basin-type structure, and the basin opening is fixedly connected to the support partition 1 by bolts and nuts; in another embodiment, the lower support 3 can be set as a square frame structure, with mounting holes provided on the four corner columns, which are fixed to the support partition 1 by bolts and nuts, and the buffer bladder 6 is set inside the frame.

[0063] Based on the above embodiments, in one embodiment, such as Figure 5-10 In the provided embodiment, the opening of the buffer bladder 6 is sealed to the bottom of the support partition 1. The support partition 1 is also provided with a communication structure, through which the buffer bladder 6 is connected to the vibration damping bladder 5 sealed to the upper side of the support partition 1.

[0064] Based on the above embodiments, in one embodiment, the connecting structure is a through hole formed in the supporting partition 1, through which the damping oil in the damping bladder 5 and the buffer bladder 6 provides buffer damping. In a more preferred embodiment, the support... Figure 5-9 In the provided embodiment, the support partition 1 has a plurality of mounting holes arranged evenly in a circumferential direction. A plurality of throttling damping structures are installed in the mounting holes as a connecting structure, which can control the flow rate of the damping oil and adjust the damping magnitude.

[0065] Based on the above embodiments, in one embodiment, such as Figure 5-9 In the provided embodiment, the throttling damping structure is a throttling valve 8, which controls the flow rate of the damping oil and thus the damping magnitude by adjusting the opening and closing of the valve port. In another embodiment, multiple through holes can be opened on the support partition 1, and a rotatable cover plate can be provided on the upper or lower surface of the support partition plate. The opening and closing of the through holes can be controlled by adjusting the angle of the cover plate, thereby adjusting the flow rate of the damping oil and changing the damping magnitude.

[0066] Based on the above embodiments, in one embodiment, such as Figure 5-9 In the provided embodiment, a lead wire groove 81 is also provided on the support partition 1 at the position for installing the throttle valve 8. The throttle valve 8 includes a valve body and an electrically controlled valve core 82. The electrically controlled valve core 82 is connected to an external control structure through the lead wire groove 81 to remotely control the opening and closing of the valve port.

[0067] Based on the above embodiments, in one embodiment, the throttle valve 8 has only two valve ports connecting the damping bladder 5 and the buffer bladder 6, and the opening and closing size of the valve ports is controlled by the electrically controlled valve core 82 to control the fluid flow rate; in a more preferred embodiment, such as Figure 5-12In the provided embodiment, the throttle valve 8 has three valve ports with different orifice diameters and an electrically controlled valve core 82 with an arc-shaped thin-walled structure. The electrically controlled valve core 82 rotates within the valve core to control the opening and closing of the valve ports. The supporting partition 1 has multiple through holes. The valve with the largest orifice diameter among the three valve ports of the throttle valve 8 is connected to one of the through holes. The electrically controlled valve core 82 controls the opening and closing of the other two valve ports with different orifice diameters to control the fluid flow rate. Figure 9 When the drive motor 11 operates at low torque, it controls the rotation angle of the electronically controlled valve core 82, connecting the valve port with the largest orifice and the valve port with the medium orifice. At this time, the damping oil flow rate is at its minimum, providing low damping and achieving low-frequency vibration isolation of the drive motor 11; Figure 8 When the drive motor 11 is running at high torque, the valve port with medium diameter is closed and the valve port with the largest diameter is connected to the valve port with the smallest diameter. At this time, the damping oil flow rate is at its maximum, providing large damping and suppressing the vibration amplitude of the drive motor 11.

[0068] Based on the above embodiments, in one embodiment, the shock-absorbing bladder 5 and the buffer bladder 6 use folded rubber bellows; in another embodiment, such as... Figure 5-10 In the provided embodiment, the shock-absorbing bladder 5 is a circular bladder that surrounds the upper bracket 2 and the supporting partition 1 and is fixed to the connection structure of the two. The buffer bladder 6 is a circular membrane. The edge of the buffer bladder 6 is fixed to the lower surface of the supporting partition 1, and the middle hangs down to form a pocket-shaped structure. The shock-absorbing bladder 5 and the buffer bladder 6 are made of rubber tempered membrane. Multiple connecting structures for connecting the shock-absorbing bladder 5 and the buffer bladder 6 are provided on the supporting partition 1 and are evenly arranged in a circumferential direction on the supporting partition 1.

[0069] Based on the above embodiments, in one embodiment, such as Figure 5-10 In the provided embodiment, the upper bracket 2 and the supporting partition 1 use a circular structure corresponding to the shape of the vibration damping bladder 5 and the buffer bladder 6. In other embodiments, the shape of the upper bracket 2 and the supporting partition 1 can be adjusted to adapt to different working conditions and different installation environments. The upper bracket 2 and the supporting partition 1 of different shapes all fall within the protection scope of this invention.

[0070] Based on the above embodiments, in one embodiment, the upper bracket 2 and the supporting partition 1 are configured as a circular flat plate structure, and mounting grooves are drawn on the flat plate to fix and connect the vibration damping bladder 5. In a more preferred embodiment, such as... Figure 5-7In the provided embodiment, the upper support 2 is configured as a circular basin structure. A mounting ring groove 9 with an upward-facing opening is provided in the center of the basin bottom and the top of the side wall of the upper support 2. The edge of the support partition 1 is also provided with a mounting ring groove 9 with an upward-facing opening. The two ends of the vibration damping bladder 5 extend into the two mounting ring grooves 9 and are fixed by vulcanization. This configuration of the support partition 1 and upper support 2 provides higher structural strength. In another embodiment, the vibration damping bladder 5 can also be fixed to the upper support 2 and support partition 1 using bolts, nuts, and sealing gaskets.

[0071] Based on the above embodiments, in one embodiment, such as Figure 5-7 In the provided embodiment, the lower side of the upper bracket 2 is provided with an outward-facing mounting ring groove 9 near the middle, and the middle of the support partition 1 is also provided with an upward-extending connecting pipe section 101. The top of the connecting pipe section 101 is provided with a downward-facing mounting ring groove 9, and the two ends of the lifting adjustment bladder 4 are respectively installed in the two mounting ring grooves 9. In another embodiment, the vibration damping bladder 5 can also be fixed to the upper bracket 2 and the support partition 1 by bolts and nuts in conjunction with sealing gaskets.

[0072] Based on the above embodiments, in another embodiment, the controlled telescopic vibration isolation device used in the control method for adjusting the height of the drive motor according to changes in vehicle load provided by the present invention can also be, for example, Figure 4 The rubber vibration isolation 18 used is integrated with an electric telescopic rod or telescopic airbag and other lifting guide structure to drive the rubber vibration isolation 18 to achieve controlled extension and retraction, thereby adjusting the height of the drive motor 11.

[0073] The present invention also provides a vehicle that adjusts the height of the drive motor according to changes in vehicle load. The control method used by the vehicle to adjust the height of the drive motor according to changes in vehicle load is the control method provided in the above embodiments, and will not be described in detail here.

[0074] Based on the above embodiments, in one embodiment, such as Figure 5-12 In the provided embodiment, the height sensor 10 is installed on the upper bracket 2 of the vibration isolation device 21 to detect the height of the upper bracket 2 relative to the supporting partition 1. Since the thickness of the upper bracket 2, the supporting partition 1 and the lower bracket 3 does not change, the real-time height of the vibration isolation device 21 can be calculated by measuring the height of the upper bracket 2 relative to the supporting partition 1, which in turn reflects the height of the drive motor relative to the drive axle.

[0075] The control logic of the control method for adjusting the height of the drive motor according to changes in vehicle load provided by this invention is as follows: Figure 5-13As shown, when the vehicle is in motion, the vehicle's load is assumed to remain constant, so the standard is whether the vehicle is in a forward gear. During vehicle operation, the control system 23 reads the reading D of the strain gauge 22 on the leaf spring 14, calculates the height C' that the vibration isolation device 21 should be adjusted to under the current operating condition based on the pre-fitted relative relationship curve, and then reads the actual height C of the vibration isolation device 21 detected by the height sensor 10. By comparing the values ​​of C and C', the relative position of the drive motor 11 and the drive axle 13 is determined. If C is greater than C', it is determined that the height of the drive motor 11 is greater than the height of the drive axle 13. At this time, the fluid medium in the lifting adjustment bladder 4 is extracted to lower the height of the vibration isolation device 21, the value of C decreases, and the drive motor 11 is driven to lower its height. If C is less than C', ... If the height of the drive motor 11 is determined to be less than the height of the drive axle 13, fluid medium is added to the lifting adjustment bladder 4 to increase the height of the vibration isolation device 21. The value of C increases, thereby increasing the relative height of the drive motor 11. If C equals C', it is determined that the drive motor 11 and the drive axle 13 are already at a 0-degree angle. At this time, there is no need to adjust the height of the lifting adjustment bladder 4.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A control method for adjusting the height of the drive motor according to changes in vehicle load, characterized in that, The vibration isolation device between the drive motor and the frame adopts a controlled telescopic vibration isolation device. Under the premise that the drive motor and the drive axle are always at the same height, the relative relationship between the vehicle's load and the height of the vibration isolation device is predetermined. The vehicle's load is detected, and the control system controls the telescopic extension and retraction of the vibration isolation device according to the vehicle's load and the aforementioned relative relationship, adjusting the height of the drive motor to be at the same height as the drive axle.

2. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 1, characterized in that, The load-bearing capacity of a vehicle is determined by measuring the stress value of the leaf springs.

3. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 2, characterized in that, The stress value of the leaf spring is detected by attaching strain gauges to it, and the strain gauges are connected to the control system.

4. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 2, characterized in that, Keeping the height of the vibration isolation device constant, under different load conditions such as vehicle being unloaded, fully loaded, and between unloaded and fully loaded, the stress value of the leaf spring and the required height of the vibration isolation device when the drive axle and drive motor are kept at the same height are determined respectively. A relationship curve is formed by fitting the stress value of the leaf spring and the corresponding required height of the vibration isolation device, which is used as the relative relationship.

5. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 4, characterized in that, The vibration isolation device is equipped with a height sensor to detect the real-time height of the vibration isolation device and thus determine the difference between the real-time height and the required height.

6. The control method for adjusting the height of the drive motor according to changes in vehicle load according to any one of claims 1-5, characterized in that, This is executed when the vehicle is in drive.

7. The control method for adjusting the height of the drive motor according to changes in vehicle load according to any one of claims 1-5, characterized in that, The controlled telescopic vibration isolation device includes a support partition and upper and lower brackets installed on the upper and lower sides of the support partition. The lower bracket is fixedly connected to the support partition, and the upper bracket is guided and movably installed on the support partition in the vertical direction. A lifting adjustment bladder is provided between the upper bracket and the support partition, and a damping bladder is also provided between the upper bracket and the support partition. The damping bladder is connected to a buffer bladder. When the relative height between the upper bracket and the support partition changes, the buffer medium is replenished into the damping bladder through the buffer bladder or the buffer medium in the damping bladder is retracted through the buffer bladder.

8. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 7, characterized in that, The guide structure between the upper support and the support partition is set in the lifting adjustment bladder or the vibration damping bladder.

9. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 8, characterized in that, The lifting adjustment bladder is a lifting air bladder, while the shock absorption bladder and the buffer bladder are both oil bladders. The lifting adjustment bladder is located in the middle of the shock absorption bladder.

10. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 9, characterized in that, There is a receiving space between the lower bracket and the supporting partition, and the buffer bladder is disposed in the receiving space.

11. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 10, characterized in that, The lower support is a basin-type structure, and the basin opening is fixedly connected to the support partition, forming the aforementioned accommodating space within the basin's inner cavity.

12. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 11, characterized in that, The opening of the buffer bladder is sealed to the lower side of the support partition, and the support partition is provided with a connecting structure to realize the connection between the shock-absorbing bladder and the buffer bladder.

13. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 12, characterized in that, The connection structure is a throttling damping structure.

14. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 13, characterized in that, The connecting structure is a throttle valve.

15. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 14, characterized in that, The throttle valve is an electrically controlled valve, which can adjust the opening degree.

16. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 15, characterized in that, The support partition is provided with a through hole. The throttle valve includes a valve body connected to the through hole on the support partition. The valve body has a valve body cavity communicating with the through hole. The valve body cavity is connected with valve ports of different diameters. The valve core in the valve body cavity opens different valve ports at different positions so as to communicate with the through hole.

17. The control method for adjusting the height of the drive motor according to changes in vehicle load according to any one of claims 12-16, characterized in that, Both the vibration damping bladder and the buffer bladder are circular bladders with multiple interconnected structures, which are evenly arranged around the circumference.

18. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 17, characterized in that, Both the support partition and the upper bracket are circular, and the two ends of the shock-absorbing bladder and the two ends of the lifting and adjusting bladder are respectively sealed to the upper bracket and the support partition.

19. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 18, characterized in that, The upper support is a basin-shaped support with the rim facing downwards. The side wall edge of the upper support is folded back to form an installation ring groove with the opening facing upwards. The edge of the support partition is folded back to form an installation ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the installation ring grooves at the edge of the upper support and the edge of the support partition, respectively, and are fixed and sealed.

20. The control method for adjusting the height of the drive motor according to changes in vehicle load as described in claim 19, characterized in that, The lower side of the upper bracket has an outward-facing mounting ring groove near the middle position. The support partition has an upward-extending connecting pipe section near the middle position. The top edge of the connecting pipe section is folded back to form an downward-facing mounting ring groove. The two ends of the lifting adjustment bladder extend into the mounting ring grooves at the middle position of the upper bracket and the top of the connecting pipe section, respectively, and are fixed and sealed.

21. A vehicle that adjusts the height of the drive motor according to changes in vehicle load, characterized in that... The method is used to adjust the height of the drive motor according to changes in vehicle load using the control method described in any one of claims 1-20, so that the drive motor and the drive axle are always at the same height.

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