Control method for adjusting height of driving motor on the basis of vehicle load change, and vehicle

Abstract

Provided are a control method for adjusting the height of a driving motor on the basis of a vehicle load change, and a vehicle. The height of a controllably telescopic vibration isolation device between a driving motor and a vehicle frame is controlled so as to keep the driving motor and a driving axle at the same height; the relative relationship, when the driving motor and the driving axle are always at the same height, between the vehicle load and the height to which the vibration isolation device should be adjusted for keeping the driving motor and the driving axle at the same height is predetermined; then the vehicle load condition is detected; and the vibration isolation device is controlled to extend and retract on the basis of the determined relative relationship to adjust the height difference between the driving motor and the driving axle, so that the driving motor and the driving axle are kept at the same height. The problem in the prior art that when a vehicle is under different loads, vibration and noise are generated in the vehicle due to a driving motor, a transmission shaft and a driving axle being not on a same axis and forming angles is solved.

Description

Control method for adjusting drive motor height based on vehicle load changes and vehicle 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 of new energy buses. The chassis of a new energy bus typically uses a drive motor + drive shaft + leaf spring configuration, as shown in Figure 1. 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, which is 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 and affect comfort and overall vehicle operation. Therefore, existing technologies use vibration isolation devices to reduce the vibration of the drive motor 11. As shown in Figure 4, one type of rubber vibration isolation structure connects the drive motor 11 to the frame 17 via rubber vibration isolation 18. Vibration is reduced by installing rubber vibration isolation 18 at the bottom of the drive motor 11. Another vibration isolation structure, such as the passive hydraulic suspension with an equivalent mechanical structure provided by Chinese invention patent CN103671686B, uses a dual-fluid medium formed by an air spring and hydraulic damping to provide synergistic vibration isolation for the drive motor, reducing its vibration and improving overall vehicle comfort.

[0003] However, as the load on the bus changes, the frame will deform to different degrees depending on the load. As shown in Figure 2, when the vehicle is fully loaded, the frame sinks as a whole. Since the two ends of the leaf spring 14 are fixed to the frame, the leaf spring 14 is in a flattened state. In general, the design ensures that the drive motor 11, drive shaft 12 and drive axle 13 are on the same straight line when fully loaded. As shown in Figure 3, when the vehicle is unloaded, the 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 drive shaft 12 increases, and there is an angle between the drive axle 13, drive shaft 12 and drive motor 11. When there is an angle between the drive motor 11, drive shaft 12 and 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 movement of the vibration isolation device according to the vehicle load and the 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-bearing 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 serves as a 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 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.

[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-like structure, and the basin opening is fixedly connected to the support partition, forming an 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 throttling damping structure is a throttling 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. 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 a first mounting ring groove with the opening facing upwards. The edge of the support partition is folded back to form a second mounting ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the first and second mounting 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 a third mounting ring groove with an outward opening near the middle position, and the support partition has an upwardly extending connecting pipe section near the middle position. The top edge of the connecting pipe section is folded back to form a fourth mounting ring groove with an downward opening. The two ends of the lifting adjustment bladder extend into the third and fourth 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. Beneficial effects:

[0025] 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's load and the height of the vibration isolation device is predetermined and stored in the control system, ensuring that the drive motor and 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 based on the vehicle load and the relative relationship, adjusting the height of the drive motor to be 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-bearing 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 serves as a 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 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.

[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-like structure, and the basin opening is fixedly connected to the support partition, forming an 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 throttling damping structure is a throttling 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. 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 a first mounting ring groove with the opening facing upwards. The edge of the support partition is folded back to form a second mounting ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the first and second mounting 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 a third mounting ring groove with an outward opening near the middle position, and the support partition has an upwardly extending connecting pipe section near the middle position. The top edge of the connecting pipe section is folded back to form a fourth mounting ring groove with an downward opening. The two ends of the lifting adjustment bladder extend into the third and fourth 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.

[0046] Beneficial effects:

[0047] 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

[0048] Figure 1 is a schematic diagram of the assembly structure of a vehicle chassis transmission mechanism in the prior art;

[0049] Figure 2 is a front view of the chassis transmission mechanism of a vehicle under full load in the prior art;

[0050] Figure 3 is a front view of the chassis transmission mechanism of a vehicle in the prior art when it is unloaded;

[0051] Figure 4 is a schematic diagram of the assembly structure of a drive motor using rubber vibration isolation in the prior art;

[0052] Figure 5 is a schematic diagram of the assembly structure of the vibration isolation device;

[0053] Figure 6 is a schematic diagram of the upper support structure of the vibration isolation device;

[0054] Figure 7 is a schematic diagram of the support diaphragm structure of the vibration isolation device;

[0055] Figure 8 is a schematic diagram of the structure of the throttle valve of the vibration isolation device when the small-diameter channel is open;

[0056] Figure 9 is a schematic diagram of the structure of the throttle valve of the vibration isolation device when the large-diameter channel is open;

[0057] Figure 10 is a schematic diagram of the lower support structure of the vibration isolation device;

[0058] Figure 11 is a front view of the chassis transmission mechanism of a vehicle equipped with vibration isolation devices under full load.

[0059] Figure 12 is a front view of the chassis transmission mechanism of a vehicle equipped with vibration isolation devices in an unloaded state.

[0060] Figure 13 is a logic flowchart of the control method for adjusting the height of the drive motor according to changes in vehicle load.

[0061] 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

[0062] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0063] 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.

[0064] 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.

[0065] Based on the above principles, in a basic embodiment, as shown in Figures 5-12, the control method for adjusting the height of the drive motor according to changes in vehicle load provided by this invention uses a vibration isolation device 21 between the drive motor 11 and the vehicle frame, which 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 this 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 angle between the drive motor 11 and drive axle 13.

[0066] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, the load condition of the vehicle is reflected by detecting the stress value of the leaf spring 14 under different loads on the vehicle body; 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 is reflected by the change in the height of the frame relative to the ground.

[0067] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, 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.

[0068] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, 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 conditions 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.

[0069] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, 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.

[0070] 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.

[0071] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, 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 extracting a fluid medium into the lifting adjustment bladder 4, the length of the lifting adjustment bladder 4 in the vertical direction is changed, thereby controlling the upper support 2 to move vertically up and down. The upper support 2 and the supporting partition 1... A damping bladder 5 is also provided, which is connected to a buffer bladder 6. When the drive motor 11 vibrates, the upper bracket 2 compresses the damping bladder 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 damping bladder 5 and the buffer bladder 6. When the height of the drive motor 11 is raised, the volume of the damping bladder 5 increases. Since the total volume of the damping oil in the damping bladder 5 and the buffer bladder 6 remains unchanged, the damping oil flows from the buffer bladder 6 to the damping bladder 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 damping bladder 5 is compressed, and the damping oil flows from the damping bladder 5 to the buffer bladder 6, so that the height of the upper bracket 2 falls slowly and steadily.

[0072] Based on the above embodiments, in one embodiment, the guide structure between the upper support 2 and the support partition 1 is a plurality of telescopic support tubes evenly arranged circumferentially on the edge of the support partition 1 and connected to the upper support 2. The telescopic support tube includes a sleeve and a rod core. The rod core is installed in the sleeve and moves up and down along the sleeve. One end of the sleeve is fixed to the support partition 1, and one end of the rod core is fixed to the upper support 2. The plurality of telescopic support tubes arranged along the edge of the support partition 1 serve as a guide structure to assist the upper support in moving up and down. In a more preferred embodiment, as shown in the embodiments provided in Figures 5-7, the guide structure between the upper support 2 and the support partition 1 includes a guide rod 71 and a guide tube body 72. The guide rod 71 is inserted into the guide tube body 72 and moves along the guide tube body 72. The guide structure 7 is set as a whole in the lifting adjustment bladder or the vibration damping bladder. This can ensure that the movement of the guide rod 71 along the guide tube body 72 is not affected by the complex external environment and avoid sand and dust entering the guide tube body 72, which would cause the guide structure 7 to not expand and contract smoothly and wear the guide rod 71.

[0073] Based on the above embodiments, in one embodiment, as shown in Figures 5-10, 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 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.

[0074] Based on the above embodiments, in one embodiment, as shown in Figures 5-10, there is a certain accommodating space between the lower support 3 and the supporting partition 1. This accommodating space is connected to the external environment, and 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 support 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.

[0075] Based on the above embodiments, in one embodiment, as shown in Figures 5 and 10, 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.

[0076] Based on the above embodiments, in one embodiment, as shown in Figures 5-10, the opening of the buffer bladder 6 is sealed to the bottom of the support partition 1, and 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.

[0077] Based on the above embodiments, in one embodiment, the connecting structure is a through hole opened on the support partition 1, and the damping oil in the damping bladder 5 and the buffer bladder 6 provides buffer damping through the through hole. In a more preferred embodiment, as shown in the embodiments provided in Figures 5-9, the support partition 1 has a plurality of mounting holes evenly arranged in a circumferential direction, and 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.

[0078] Based on the above embodiments, in one embodiment, as shown in Figures 5-9, the throttling damping structure is a throttling valve 8. The flow rate of the damping oil is controlled by adjusting the opening and closing of the valve port, thereby controlling the damping magnitude. 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 status 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.

[0079] Based on the above embodiments, in one embodiment, as shown in Figures 5-9, 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.

[0080] 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. 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, as shown in Figures 5-12, 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 is provided with 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 electronically controlled valve core 82 controls the opening and closing of two other valve ports with different orifices to control the fluid flow rate, as shown in Figure 9. When the drive motor 11 is running at low torque, the rotation angle of the electronically controlled valve core 82 is controlled to connect the valve port with the largest orifice and the valve port with the medium orifice. At this time, the damping oil flow rate is the minimum, providing small damping and realizing low-frequency vibration isolation of the drive motor 11. As shown in Figure 8, when the drive motor 11 is running at high torque, the valve port with the medium orifice is closed and the valve port with the largest orifice and the valve port with the smallest orifice are connected. At this time, the damping oil flow rate is the maximum, providing large damping and suppressing the vibration amplitude of the drive motor 11.

[0081] Based on the above embodiments, in one embodiment, the damping bladder 5 and the buffer bladder 6 use folded rubber corrugated tubes. In another embodiment, as shown in the embodiments provided in Figures 5-10, the damping bladder 5 uses 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 damping bladder 5 and the buffer bladder 6 use rubber tempered membrane as material. Multiple connecting structures for connecting the damping 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.

[0082] Based on the above embodiments, in one embodiment, as shown in Figures 5-10, 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, in order to adapt to different working conditions and different installation environments, the shape of the upper bracket 2 and the supporting partition 1 can be adjusted. The upper bracket 2 and the supporting partition 1 with different shapes all fall within the protection scope of this invention.

[0083] Based on the above embodiments, in one embodiment, the upper bracket 2 and the supporting partition 1 are configured as circular flat plate structures, and mounting grooves are drawn on the flat plate to fix and connect the vibration damping bladder 5. In a more preferred embodiment, as shown in the embodiments provided in Figures 5-7, the upper bracket 2 is configured as a circular basin structure, and mounting ring grooves 9 with upward openings formed by folding back are provided in the middle of the basin bottom and the top of the side wall of the upper bracket 2. The edge of the supporting partition 1 is also provided with mounting ring grooves 9 with openings formed by folding back facing the inside of the supporting partition 1. The two ends of the vibration damping bladder 5 extend into the two mounting ring grooves 9 respectively and are vulcanized and fixed. The supporting partition 1 and the upper bracket 2 configured in this way have higher structural strength. In another embodiment, the vibration damping bladder 5 can also be fixed to the upper bracket 2 and the supporting partition 1 by bolts and nuts in conjunction with sealing gaskets.

[0084] Based on the above embodiments, in one embodiment, as shown in Figures 5-7, 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.

[0085] 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 an electric telescopic rod or telescopic airbag integrated on the rubber vibration isolation 18 as shown in Figure 4 to drive the rubber vibration isolation 18 to achieve controlled telescopic extension and retraction, thereby adjusting the height of the drive motor 11.

[0086] 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.

[0087] Based on the above embodiments, in one embodiment, as shown in Figures 5-12, 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.

[0088] 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 shown in Figure 5-13. When the vehicle is in motion, it is assumed that the vehicle load no longer changes, so whether the vehicle is in a forward gear is used as the standard. During vehicle motion, 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 working condition according to 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 magnitudes of C and C', the relative height of the drive motor 11 and the drive axle 13 is determined. Regarding the position, 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 inside the lifting adjustment bladder 4 is extracted, the height of the vibration isolation device 21 is lowered, the value of C decreases, and the drive motor 11 is driven to lower its height. If C is less than C', it is determined that the height of the drive motor 11 is less than the height of the drive axle 13. At this time, the fluid medium is added to the lifting adjustment bladder 4, the height of the vibration isolation device 21 is raised, the value of C increases, and the relative height of the drive motor 11 is increased. If C is equal to C', it is determined that the drive motor 11 and the drive axle 13 are already at a 0-degree angle, and there is no need to adjust the height of the lifting adjustment bladder 4.

[0089] 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 a drive motor according to changes in the load of a vehicle, characterized by, The vibration isolation device between the drive motor and the vehicle frame is 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 extension and retraction of the vibration isolation device according to the vehicle's load and the relative relationship, adjusting the height of the drive motor so that it is at the same height as the drive axle.

2. The control method of claim 1, wherein The load-bearing capacity of the vehicle is detected by measuring the stress value of the leaf springs.

3. The control method of claim 2, wherein the control method further comprises: determining a load of the vehicle; and adjusting the height of the drive motor based on the determined load of the vehicle. The stress value of the leaf spring is detected by attaching strain gauges to the leaf spring, and the strain gauges are connected to the control system.

4. The control method of claim 2, wherein the control method further comprises: determining a load of the vehicle; and adjusting the height of the drive motor based on the determined load of the vehicle. 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 the 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 of claim 4, wherein the control method further comprises: determining a load of the vehicle; and adjusting the height of the drive motor based on the determined load of the vehicle. 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 of adjusting the height of the driving motor according to the load of the vehicle according to any one of claims 1 to 5, characterized by, This is performed when the vehicle is in forward gear.

7. The control method of adjusting the height of the driving motor according to the load of the vehicle according to any one of claims 1 to 5, characterized by, 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 movably mounted 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 bracket and the supporting partition is disposed in the lifting adjustment bladder or the vibration damping bladder.

9. The control method of claim 8, wherein the control method further comprises: determining a load of the vehicle; and adjusting the height of the drive motor based on the determined load of the vehicle. The lifting adjustment bladder is a lifting air bladder, the shock-absorbing bladder and the buffer bladder are both oil bladders, and the lifting adjustment bladder is located in the middle of the shock-absorbing bladder.

10. 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, There is a receiving space between the lower bracket and the supporting partition, and the buffer bladder is disposed within 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, with the inner cavity of the basin forming the receiving space.

12. 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 opening of the buffer bladder is sealed to the lower side of the support partition, and the support partition is provided with a communication structure to realize the communication between the shock-absorbing bladder and the buffer bladder.

13. The control method of adjusting the height of the driving motor according to the change of the load of the vehicle according to claim 12, wherein 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 throttling damping structure is a throttling 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 14, characterized in that, The supporting partition is provided with a through hole, and the throttle valve includes a valve body connected to the through hole on the supporting 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 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 7-16, characterized in that, Both the vibration damping bladder and the buffer bladder are circular bladders, and there are multiple connecting structures that 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 supporting partition and the upper bracket are circular, and the two ends of the vibration damping bladder and the two ends of the lifting adjustment bladder are respectively sealed to the upper bracket and the supporting 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-type support with the rim facing downwards. The side wall edge of the upper support is folded back to form a first mounting ring groove with the opening facing upwards. The edge of the support partition is folded back to form a second mounting ring groove with the opening facing inwards. The two ends of the vibration damping bladder extend into the first mounting ring groove and the second mounting ring groove 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 a third mounting ring groove with an outward opening near the middle position. The support partition has an upwardly extending connecting pipe section near the middle position. The top edge of the connecting pipe section is folded back to form a fourth mounting ring groove with a downward opening. The two ends of the lifting adjustment bladder extend into the third and fourth 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. 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 movably mounted on the support partition in the vertical direction. A lifting adjustment bladder and a vibration damping bladder are respectively installed on the support partition. The bottom of the upper bracket is connected to the lifting adjustment bladder, and an extension arm is provided on the upper bracket to connect the vibration damping bladder. The height adjustment and vibration damping of the upper bracket are achieved by the parallel arrangement of the lifting adjustment bladder and the vibration damping bladder.

22. 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 as described in any one of claims 1-21, so that the drive motor and the drive axle are always at the same height.

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