A suspension structure with variable limit and control method thereof

Abstract

The present application provides a suspension structure with variable limit and a control method thereof, comprising: a first elastic member, a second elastic member and a driving device, wherein a first elastic member fixedly connected to the inner side wall of the installation space is arranged in the installation space of the suspension body, and the second elastic member is installed in the first space; the driving device is used to drive the second elastic member to move in the direction of extension and retraction of the driving end of the driving device, so that an adjustable relative position, i.e., the width of the linear segment, is generated between the second elastic member and the first elastic member. The driving device has a first working condition, a second working condition and a third working condition. During the actual driving process of the vehicle, the working condition of the driving device can be switched according to the working state of the range extender and the actual movement state of the vehicle to adjust the relative position of the second elastic member and the first elastic member, thereby adjusting the vibration isolation and limit performance of the suspension system, and finally achieving good NHV performance in various operating modes of the hybrid vehicle.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of automobile suspension systems, and in particular to a variable limit suspension structure and a control method thereof. Background Art

[0002] When existing hybrid vehicles maintain pure electric drive and drive smoothly, the range extender will not start running; at this time, the suspension system does not need to provide vibration isolation. However, when the vehicle suddenly accelerates or brakes, due to the large mass of the range extender, it will produce obvious shaking, and the linear segment on the vibration isolation rubber of the suspension system (the gap between the limit rubber and the main rubber rib) will be completely compressed; the remaining kinetic energy is consumed by the contact between the main ribs of the vibration isolation rubber and the limit rubber; at this time, the body will have a sense of impact, and the suspension system needs to provide more damping to provide effective vibration isolation.

[0003] In the prior art, the width of the linear segment cannot be automatically adjusted. At the same time, there is a lack of a method for adjusting the linear segment of the suspension system according to the actual vehicle driving state and the state of the range extender to adjust the vibration isolation effect of the suspension system. It is difficult to produce good vibration isolation and limiting performance in various operating modes of hybrid vehicles. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a suspension structure with variable limit and a control method thereof.

[0005] In a first aspect, the present application provides a suspension structure with variable limit, comprising:

[0006] A first elastic member, wherein two ends of the first elastic member are respectively fixedly connected to the inner side walls of the installation space of the suspension body, dividing the installation space into a first space and a second space;

[0007] a second elastic member, the second elastic member being disposed in the first space and separated from the inner side wall of the suspension body by a gap;

[0008] A driving device, the driving device is fixedly mounted on the outer side wall of the suspension body; the driving end of the driving device passes through the side wall of the suspension body and is fixedly connected to the second elastic member, and is used to drive the second elastic member to move relative to the extension direction of the driving end of the driving device;

[0009] Wherein, the driving device has a first working condition, a second working condition and a third working condition; when in the first working condition, the driving end of the driving device is in an initial position, and there are gaps between the second elastic member and the inner wall of the first space and the first elastic member; when in the second working condition, the driving end of the driving device contracts, driving the second elastic member to abut against the inner wall of the first space; when in the third working condition, the driving end of the driving device extends, driving the second elastic member to abut against the first elastic member.

[0010] According to the technical solution provided in the embodiment of the present application, the third working condition also includes the first state, the second state and any state between the first state and the second state;

[0011] When the driving device is in the first state, the second elastic member abuts against the first elastic member and no interaction force is generated; when the driving device is in the second state, the second elastic member abuts against the first elastic member, the second elastic member generates a maximum compression deformation, and the first elastic member abuts against the inner wall of the second space;

[0012] The compression deformation amount is the compression length generated by the abutment between the second elastic member and the first elastic member along the telescopic direction of the driving end of the driving device.

[0013] According to the technical solution provided in the embodiment of the present application, a third elastic member is provided in the second space, and the third elastic member is fixedly mounted on the inner wall of the second space and separated from the first elastic member by a gap; the third elastic member is used to abut against the first elastic member when the driving device is in the second state of the third working condition.

[0014] According to the technical solution provided in the embodiment of the present application, a bracket is detachably installed on one end of the second elastic member close to the inner wall of the first space, and the side of the bracket away from the second elastic member is fixedly connected to the driving end of the driving device.

[0015] In a second aspect, the present application provides a control method for a suspension structure with variable limit applied to the above embodiment, comprising:

[0016] Obtain vehicle driving status and range extender operating status;

[0017] querying a first database according to the driving state of the vehicle and the operating state of the range extender to obtain a first corresponding working condition of the second elastic member of the left suspension, a second corresponding working condition of the second elastic member of the right suspension, and a third corresponding working condition of the second elastic member of the rear suspension; the first database stores the corresponding working condition of each second elastic member included in the suspension structure under each driving state of the vehicle and each operating state of the range extender;

[0018] Controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the first corresponding working condition;

[0019] Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the second corresponding working condition;

[0020] The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the third corresponding working condition.

[0021] According to the technical solution provided in the embodiment of the present application, before the step of obtaining the vehicle driving state and the range extender operating state is performed, it also includes:

[0022] After detecting that the vehicle is powered on, the steps of obtaining the vehicle driving state and the range extender operating state to controlling the drive device to drive the second elastic member to switch to the corresponding working condition are repeated with a first set time as a cycle until the vehicle is turned off.

[0023] According to the technical solution provided in the embodiment of the present application, before detecting that the vehicle is powered on, the method further includes:

[0024] Get the model of the current vehicle and obtain the model information of the vehicle;

[0025] According to the vehicle model information, the second database is queried to obtain the first length of the second elastic member of the left suspension along the extension direction of the driving device, the second length of the second elastic member of the right suspension along the extension direction of the driving device, and the third length of the second elastic member of the rear suspension along the extension direction of the driving device corresponding to the vehicle model information; the second database stores the lengths of the second elastic member of the left suspension, the lengths of the second elastic member of the right suspension, and the lengths of the second elastic member of the rear suspension corresponding to various vehicle models;

[0026] Mounting a second elastic member of the left suspension having a first length on the left suspension body;

[0027] Installing a second elastic member of the right suspension having a second length onto the right suspension body;

[0028] A second elastic member of the rear suspension having a third length is mounted on the rear suspension body.

[0029] According to the technical solution provided in the embodiment of the present application, when the range extender is in a non-operating state, after the step of controlling the driving device to drive the second elastic member to switch to the corresponding working condition, the second elastic member is in a third working condition, further comprising:

[0030] Obtaining the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain a first frequency; the first frequency includes the rigid body modal frequencies of the suspension structure and the range extender as a whole in multiple directions in the vehicle coordinate system;

[0031] Determine whether the first frequency is within a first setting range. When the first frequency is within the first setting range, use the non-operating range extender as a shock-absorbing weight to increase the damping of the suspension structure. The first setting range is a frequency range in which the suspension structure and the range extender are used as a shock-absorbing weight as a whole.

[0032] When the first frequency is not within the first set range, the driving device is controlled to adjust the state under the third working condition, thereby changing the compression deformation amount generated by the second elastic member, and returning to obtain the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain the first frequency.

[0033] According to the technical solution provided in the embodiment of the present application, when the first frequency is not within the first setting range, before controlling the driving device to adjust the state under the third working condition, the method further includes:

[0034] Determine the magnitude of the first frequency and the first setting range, and when the first frequency is less than the minimum frequency of the first setting range, control the driving end of the driving device to move a first setting distance in the direction of the second state;

[0035] When the first frequency is greater than the maximum frequency of the first setting range, the driving end of the driving device is controlled to move a first setting distance in the direction of the first state.

[0036] According to the technical solution provided in the embodiment of the present application, after the step of determining the magnitude of the first frequency and the first setting range, and before the step of controlling the driving end of the driving device to move the first setting distance in the direction of the second state, the step further includes:

[0037] The optimal rigid body modal frequency of the suspension structure and the range extender as a whole is obtained when the range extender is not running and the non-running range extender is used as a shock-absorbing counterweight to obtain a second frequency; the second frequency is stored in a third database; the third database stores the correspondence between various states of the drive devices of the left suspension, the right suspension and the rear suspension in the third working condition and the rigid body modal frequency of the suspension structure and the range extender as a whole;

[0038] querying a third database according to the second frequency to obtain a third state of the left suspension drive device corresponding to the second frequency under a third working condition, obtaining a fourth state of the right suspension drive device corresponding to the second frequency under the third working condition, and obtaining a fifth state of the rear suspension drive device corresponding to the second frequency under the third working condition;

[0039] Controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the third state;

[0040] Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the fourth state;

[0041] The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the fifth state.

[0042] The beneficial effects of this application are:

[0043] A first elastic member fixedly connected to the inner side wall of the installation space is arranged in the installation space of the suspension body, a second elastic member is installed in the first space, and a driving device is used to drive the second elastic member to move in the direction of the extension and retraction of the driving end of the driving device, so that an adjustable relative position is generated between the second elastic member and the first elastic member. The driving device has a first working condition, a second working condition and a third working condition; when in the first working condition, the driving end of the driving device is in an initial position, and there are gaps between the second elastic member and the inner side wall of the first space and the first elastic member; when in the second working condition, the driving end of the driving device contracts, driving the second elastic member to abut against the inner side wall of the first space; when in the third working condition, the driving end of the driving device extends, driving the second elastic member to abut against the first elastic member.

[0044] Through the above structure, during the actual driving process of the vehicle, the working condition of the driving device can be switched according to the working state of the range extender and the actual movement state of the vehicle to adjust the relative position of the second elastic member and the first elastic member, that is, the width of the linear segment, and then adjust the vibration isolation effect of the suspension system, and finally achieve good vibration isolation and limiting performance in various operating modes of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0046] Figure 1 It is a structural schematic diagram of the left suspension;

[0047] Figure 2 It is a structural schematic diagram of the right suspension;

[0048] Figure 3 is a structural schematic diagram of the rear suspension;

[0049] Figure 4 is a structural schematic diagram of the suspension structure in a first working condition;

[0050] Figure 5 is a structural schematic diagram of the suspension structure in the second working condition;

[0051] Figure 6is a structural schematic diagram of the suspension structure being in a first state under a third working condition;

[0052] Figure 7 is a structural schematic diagram of the suspension structure being in the second state under the third working condition;

[0053] Figure 8 A flow chart of a control method for a variable-limit suspension structure provided in the present application;

[0054] Fig. 9 It is the VCU / ECU comprehensive judgment table;

[0055] Among them: 1. left suspension suspension body; 2. right suspension suspension body; 3. rear suspension suspension body; 4. left suspension first elastic member; 5. left suspension second elastic member; 6. left suspension third elastic member; 7. right suspension first elastic member; 8. right suspension second elastic member; 9. right suspension third elastic member; 10. rear suspension first elastic member; 11. rear suspension second elastic member; 12. rear suspension third elastic member; 13. left suspension drive device; 14. right suspension drive device; 15. rear suspension drive device; 16. left suspension bracket; 17. right suspension bracket; 18. rear suspension bracket. DETAILED DESCRIPTION

[0056] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0057] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0058] Example 1

[0059] Please refer to Figure 1-Figure 3 , which is a schematic diagram of a variable limit suspension structure provided in this embodiment, including:

[0060] A first elastic member, wherein two ends of the first elastic member are respectively fixedly connected to the inner side walls of the installation space of the suspension body, dividing the installation space into a first space and a second space;

[0061] a second elastic member, which is disposed in the first space and separated from the inner side wall of the suspension body by a gap;

[0062] A driving device, the driving device is fixedly mounted on the outer side wall of the suspension body; the driving end of the driving device passes through the side wall of the suspension body and is fixedly connected to the second elastic member, and is used to drive the second elastic member to move relative to the extension direction of the driving end of the driving device;

[0063] Wherein, the driving device has a first working condition, a second working condition and a third working condition; when in the first working condition, the driving end of the driving device is in an initial position, and there are gaps between the second elastic member and the inner wall of the first space and the first elastic member; when in the second working condition, the driving end of the driving device contracts, driving the second elastic member to abut against the inner wall of the first space; when in the third working condition, the driving end of the driving device extends, driving the second elastic member to abut against the first elastic member.

[0064] In some embodiments, the first elastic member and the second elastic member are both made of rubber. Rubber has good elasticity and can effectively absorb vibrations generated by the vehicle and the range extender during movement, thereby improving the vibration isolation effect of the suspension system.

[0065] Specifically, refer to Figure 4-Figure 6 When the driving device and the second elastic member are in a first working condition, the driving end of the driving device is in an initial position, and there are gaps between the second elastic member and the inner wall of the first space and the first elastic member; when the driving device and the second elastic member are in a second working condition, the driving end of the driving device contracts, driving the second elastic member to abut against the inner wall of the first space; when the driving device and the second elastic member are in a third working condition, the driving end of the driving device extends, driving the second elastic member to abut against the first elastic member.

[0066] Specifically, the driving device has a first working condition, a second working condition and a third working condition; the driving device is used to drive the second elastic member to move and change the width of the linear segment (the gap between the second elastic member and the first elastic member), so that the working condition of the driving device can be switched according to the actual working state of the vehicle and the range extender, and the damping effect provided by the suspension body can be adjusted; when the vehicle and the range extender move, the elastic members on the suspension body provide different vibration isolation effects, so that the vehicle has good vibration isolation and limiting performance in various operating modes.

[0067] Specifically, the driving device drives the second elastic member to move, and the specific process of adjusting the damping of the suspension body includes:

[0068] The driving end of the driving device moves along the telescopic direction, and the second elastic member fixedly connected to the driving end of the driving device moves along the telescopic direction of the driving end, thereby changing the width of the linear segment between the first elastic member and the second elastic member.

[0069] When the vehicle vibrates, the time required for the first elastic member and the second elastic member to move from the initial position to abut each other due to vibration will also change due to the change in the width of the linear segment. Since the energy required to compress the elastic member remains unchanged, the natural frequency of the suspension body will eventually change.

[0070] When the vibration frequency is the same as the natural frequency of the suspension body, the suspension system will resonate with the vehicle and the range extender, quickly absorb and consume the vibration, and ultimately achieve a damping effect on the vehicle and the range extender.

[0071] Furthermore, the third operating condition also includes the first state, the second state, and any state between the first state and the second state;

[0072] When the driving device is in the first state, the second elastic member abuts against the first elastic member and no interaction force is generated; when the driving device is in the second state, the second elastic member abuts against the first elastic member, the second elastic member generates a maximum compression deformation, and the first elastic member abuts against the inner wall of the second space;

[0073] The compression deformation amount is the compression length generated by the abutment between the second elastic member and the first elastic member along the telescopic direction of the driving end of the driving device.

[0074] Specifically, when the driving device drives the second elastic member to be in the third working condition, the relative position of the second elastic member and the first elastic member can be adjusted by adjusting the extension length of the driving end of the driving device according to the current vibration frequency of the range extender, that is, the width of the linear segment can be adjusted.

[0075] Since the width of the linear segment will affect the vibration isolation effect of the suspension body on the range extender during the movement of the range extender, therefore, adjusting the width of the linear segment can achieve the adjustment of the damping of the suspension body.

[0076] Specifically, Figure 6 This is a structural schematic diagram of the first state under the third working condition, the second elastic member and the first elastic member abut against each other, and a gap is left between the first elastic member and the second space.

[0077] Figure 7 It is a structural schematic diagram of the second state under the third working condition, the second elastic member and the first elastic member abut against each other, and the first elastic member abuts against the inner side wall of the second space of the suspension body.

[0078] In some embodiments, under the third working condition, the driving device can also adjust the damping of the suspension body for a second time;

[0079] When in the second state, the first elastic member generates tensile deformation under the abutment of the second elastic member, thereby increasing the elastic force generated by the first elastic member; at the same time, the first elastic member abuts against the inner wall of the second space, and the suspension body also provides additional support force to the first elastic member. When the range extender vibrates, the suspension body in the second state will provide greater damping.

[0080] By adjusting the state under the third working condition according to the actual vibration frequency of the range extender, the damping of the suspension body can be made to correspond to the actual vibration frequency, thereby providing the vibration isolation effect to the greatest extent.

[0081] Furthermore, a third elastic member is provided in the second space, and the third elastic member is fixedly mounted on the inner wall of the second space and separated from the first elastic member by a gap; the third elastic member is used to abut against the first elastic member when the driving device is in the second state of the third working condition.

[0082] In some embodiments, a third elastic member is provided in the second space; when in the third working condition, the elastic deformation amount that can be generated by the first elastic member is reduced, and the third elastic member is added to abut against the first elastic member. The abutment between the first elastic member and the third elastic member can increase the total deformation amount under the third working condition, so that the suspension body absorbs more vibration energy and provides a better vibration isolation effect.

[0083] Furthermore, a bracket is detachably mounted on one end of the second elastic member close to the inner wall of the first space, and a side of the bracket away from the second elastic member is fixedly connected to the driving end of the driving device.

[0084] In some embodiments, a bracket is detachably mounted on one end of the second elastic member close to the inner wall of the first space; the bracket is used to provide support for the second elastic member, so that the second elastic member detached from the side wall of the suspension body installation space can generate a force along the extension and retraction direction of the driving device on the first elastic member under the support of the bracket without generating lateral deviation.

[0085] Specifically, the bracket is detachable, and the length of the second elastic member can be adjusted according to the actual vehicle model on which it is installed, thereby achieving a more effective vibration isolation effect.

[0086] Example 2

[0087] refer to Figure 8 , is a control method for a suspension structure with variable limit provided in this embodiment, which can be executed by controlling the MCU module, and the method specifically includes:

[0088] S1: Obtain vehicle driving status and range extender operating status;

[0089] S2: querying a first database according to the driving state of the vehicle and the operating state of the range extender to obtain a first corresponding working condition of the second elastic member of the left suspension, a second corresponding working condition of the second elastic member of the right suspension, and a third corresponding working condition of the second elastic member of the rear suspension; the first database stores the corresponding working condition of each second elastic member included in the suspension structure under each driving state of the vehicle and each operating state of the range extender;

[0090] S3: controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the first corresponding working condition;

[0091] Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the second corresponding working condition;

[0092] The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the third corresponding working condition.

[0093] Specifically, the actual driving state of the vehicle is detected by the VCU to obtain the vehicle driving state, the rotation speed of the range extender is detected by the ECU to obtain the range extender operating state, the vehicle driving state and the range extender operating state are input into the MCU, and the MCU queries the first database to obtain the corresponding working condition of each suspended second elastic member.

[0094] Specifically, refer to Figure 1-Figure 3 They are the structural diagrams of the left suspension, right suspension and rear suspension respectively.

[0095] The structure diagram of the left suspension includes: a left suspension suspension body 1, a left suspension first elastic member 4, a left suspension second elastic member 5, and a left suspension third elastic member 6; the driving end of the left suspension driving device 13 is fixedly connected to the left suspension bracket 16, which is used to drive the left suspension second elastic member 5 to move, so that the left suspension second elastic member 5 can switch between the first working condition, the second working condition and the third working condition. The positional relationship and connection relationship between the various structures of the left suspension are the same as those described in Example 1.

[0096] The structural diagram of the right suspension includes: a right suspension suspension body 2, a right suspension first elastic member 7, a right suspension second elastic member 8, and a right suspension third elastic member 9; the driving end of the right suspension driving device 14 is fixedly connected to the right suspension bracket 17, which is used to drive the right suspension second elastic member 8 to move, so that the right suspension second elastic member 8 can switch between the first working condition, the second working condition and the third working condition. The positional relationship and connection relationship between the various structures of the right suspension are the same as those described in Example 1.

[0097] The structure diagram of the rear suspension includes: a rear suspension body 3, a first elastic member 10 of the rear suspension, a second elastic member 11 of the rear suspension, and a third elastic member 12 of the rear suspension; the driving end of the rear suspension driving device 15 is fixedly connected to the rear suspension bracket 18, and is used to drive the second elastic member 11 of the rear suspension to move, so that the second elastic member 11 of the rear suspension can switch between the first working condition, the second working condition and the third working condition. The positional relationship and connection relationship between the various structures of the rear suspension are the same as those described in the structure of Example 1.

[0098] Specifically, refer to Figure 4 When the drive device is in the first working condition, a gap is formed between the second elastic member and the inner wall of the installation space of the suspension body, and a linear segment of normal width is formed between the second elastic member and the first elastic member.

[0099] When the driving device is in the second working condition, the second elastic member abuts against the inner side wall of the installation space of the suspension body, and a wide linear segment is separated from the first elastic member.

[0100] When the driving device is in the third working condition, there is a wider gap between the second elastic member and the inner wall of the suspension body installation space, and the second elastic member abuts against the first elastic member. At this time, the width of the linear segment between the two is 0 mm.

[0101] In some embodiments, the width of the normal-width linear segment is set to 3 mm; the width of the wide linear segment is set to 10 mm.

[0102] Specifically, the third working condition also includes a first state, a second state and any state between the first state and the second state; the state is adjusted to any state between the first state and the second state by adjusting the extended length of the driving end of the driving device.

[0103] In some embodiments, according to the driving state of the vehicle and the operating state of the range extender, the first database is queried to obtain the working conditions corresponding to the second elastic members of the left suspension, the right suspension and the rear suspension, and the driving devices and the second elastic members of the left suspension, the right suspension and the rear suspension are switched to the corresponding working conditions. The different suspension modes are adjusted respectively so that the suspension structure can adapt to the vibration of the range extender and the vehicle in various motion states, thereby producing a good vibration isolation effect.

[0104] Specifically, the first database stores the corresponding working conditions of each second elastic member included in the suspension structure under each driving state of the vehicle and each operating state of the range extender, such as Fig. 9 The VCU / ECU comprehensive judgment table is shown.

[0105] Among them, the number 1 indicates that the suspended drive device and the second elastic member in the corresponding column in the table are switched to the first working condition; the number 2 indicates that the suspended drive device and the second elastic member in the corresponding column in the table are switched to the second working condition; the number 3 indicates that the suspended drive device and the second elastic member in the corresponding column in the table are switched to the third working condition; the slash “ / ” indicates that such working condition does not exist.

[0106] The data in the first database, namely the VCU / ECU comprehensive judgment table, are obtained through actual vehicle experimental measurements, which is a feasible implementation method. The data in the table can be adjusted according to the actual vehicle model and motion state to make the suspension system better adapt to various working conditions and provide better vibration isolation effect.

[0107] Furthermore, before the step of obtaining the vehicle driving state and the range extender operating state is performed, the method further includes:

[0108] After detecting that the vehicle is powered on, the steps of obtaining the vehicle driving state and the range extender operating state to controlling the drive device to drive the second elastic member to switch to the corresponding working condition are repeated with a first set time as a cycle until the vehicle is turned off.

[0109] In some implementations, the first set time is 0.05 seconds.

[0110] In some embodiments, the operating conditions of the driving device and the second elastic member of the suspension structure are switched according to the driving state of the vehicle and the operating state of the range extender continuously and repeatedly for a first set time; the damping of the suspension structure can be adjusted in real time, so that the suspension structure can provide good vibration isolation effect under various motion states of the vehicle and the range extender.

[0111] Furthermore, before detecting that the vehicle is powered on, the method further includes:

[0112] Get the model of the current vehicle and obtain the model information of the vehicle;

[0113] According to the vehicle model information, the second database is queried to obtain the first length of the second elastic member of the left suspension along the extension direction of the driving device, the second length of the second elastic member of the right suspension along the extension direction of the driving device, and the third length of the second elastic member of the rear suspension along the extension direction of the driving device corresponding to the vehicle model information; the second database stores the lengths of the second elastic member of the left suspension, the lengths of the second elastic member of the right suspension, and the lengths of the second elastic member of the rear suspension corresponding to various vehicle models;

[0114] Mounting a second elastic member of the left suspension having a first length on the left suspension body;

[0115] Installing a second elastic member of the right suspension having a second length onto the right suspension body;

[0116] A second elastic member of the rear suspension having a third length is mounted on the rear suspension body.

[0117] In some embodiments, the second database stores the length of the left suspension second elastic member, the length of the right suspension second elastic member, and the length of the rear suspension second elastic member corresponding to various vehicle models.

[0118] The length of the left suspension second elastic member, the length of the right suspension second elastic member and the length of the rear suspension second elastic member corresponding to various vehicle models are all obtained through experimental measurements.

[0119] The specific experimental process is to install second elastic members of various lengths on the suspension body, and conduct a vibration isolation experiment, and select the corresponding length with the shortest vibration attenuation time and store it in the second database.

[0120] By conducting a vibration isolation test in advance, all possible situations are stored in the second database. When selecting the second elastic part of the vehicle suspension, the second database can be directly queried, and the second elastic part of the corresponding length can be selected and installed on the corresponding suspension body, which can save the vibration isolation effect testing time of the second elastic parts of different lengths of a single vehicle.

[0121] Further, when the range extender is in a non-operating state, after the step of controlling the driving device to drive the second elastic member to switch to the corresponding working condition, the second elastic member is in a third working condition, further comprising:

[0122] Obtaining the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain a first frequency; the first frequency includes the rigid body modal frequencies of the suspension structure and the range extender as a whole in multiple directions in the vehicle coordinate system;

[0123] Determine whether the first frequency is within a first setting range. When the first frequency is within the first setting range, use the non-operating range extender as a shock-absorbing weight to increase the damping of the suspension structure. The first setting range is a frequency range in which the suspension structure and the range extender are used as a shock-absorbing weight as a whole.

[0124] When the first frequency is not within the first set range, the driving device is controlled to adjust the state under the third working condition, thereby changing the compression deformation amount generated by the second elastic member, and returning to obtain the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain the first frequency.

[0125] In some embodiments, after the left suspension, the right suspension and the rear suspension are switched to the third working condition, they are respectively adjusted to the second state at the same time; at this time, the second elastic member and the first elastic member abut against each other, and the first elastic member and the third elastic member abut against each other; the suspension body is in a clamped state, and only the relative movement between the elastic members is generated by the deformation to absorb the vibration energy. Since the range extender is not started, the vehicle is driven by electricity, and the range extender can be used as a shock-absorbing weight. When the vehicle vibrates during driving, the vibration energy is transmitted to the range extender through the suspension structure. The above method can convert the kinetic energy of the vehicle body into the elastic potential energy of each elastic member, and then into the kinetic energy of the range extender. In this way, when the range extender is not started, the suspension body is adjusted to the clamped state, and the range extender is used to absorb the vibration energy, providing an additional vibration isolation effect.

[0126] Specifically, the specific calculation process of the rigid body modal frequency of the suspension structure and the range extender as a whole is carried out in advance in the laboratory. The experiment targets various working conditions of the suspension structure and various states under the third working condition, and combines the rotational inertia of the suspension structure and the range extender as a whole, the coordinates of the center of mass in the vehicle coordinate system, the installation angle, the coordinates of the elastic center in the vehicle coordinate system and other parameters to detect the rigid body modal frequency of the suspension structure and the range extender as a whole; the rigid body modal frequencies of the suspension structure and the range extender as a whole under various working conditions of the left suspension, right suspension and rear suspension, and various states of the third working condition are obtained, and the various states of the third working condition correspond to the rigid body modal frequencies of the suspension structure and the range extender as a whole. After the experiment, the obtained data is input into the third database, which stores the optimal rigid body modal frequency of the suspension structure and the range extender as a whole when the range extender is not running and the non-running range extender is used as a shock-absorbing counterweight-the second frequency. Since the state under the third working condition also corresponds to the telescopic length of the driving end of the driving device, after the actual vehicle is powered on and running, the third database can be directly queried according to the telescopic length of the driving end of the driving device to obtain the rigid body modal frequency of the suspension structure and the range extender as a whole; the rigid body modal frequency of the suspension structure and the range extender as a whole can be adjusted to the required value by adjusting the driving device to the corresponding working condition.

[0127] The vehicle coordinate system is a three-dimensional space coordinate system with the line parallel to the vehicle's travel direction as the X-axis, the line parallel to the vehicle tire's rotation axis as the Y-axis, and the vertical direction as the Z-axis.

[0128] Specifically, the first setting range is a frequency range in which the suspension structure and the range extender are used as a shock-absorbing weight as a whole, including: a frequency range of translation along the X-axis direction of the vehicle coordinate system and a frequency range of rotation around the Z-axis of the vehicle coordinate system.

[0129] In some implementations, the frequency range of translation of the vehicle coordinate system in the X-axis direction is set to 14 Hz-16 Hz; the frequency range of rotation around the Z-axis of the vehicle coordinate system is set to 39 Hz-41 Hz.

[0130] Specifically, switching the suspension body to the clamped state can limit the range extender serving as a shock-absorbing counterweight, thereby preventing the range extender from being damaged due to excessive vibration.

[0131] Furthermore, when the first frequency is not within the first setting range, before controlling the driving device to adjust the state under the third working condition, the method further includes:

[0132] Determine the magnitude of the first frequency and the first setting range, and when the first frequency is less than the minimum frequency of the first setting range, control the driving end of the driving device to move a first setting distance in the direction of the second state;

[0133] When the first frequency is greater than the maximum frequency of the first setting range, the driving end of the driving device is controlled to move a first setting distance in the direction of the first state.

[0134] In some embodiments, when it is determined that the first frequency is not within the first set range, the first frequency is further adjusted to be within the first set range; adjusting the first frequency means adjusting the damping of the first elastic member; and adjusting the contact force between the first elastic member and the second elastic member by adjusting the state of the driving device and the second elastic member, thereby finally achieving the adjustment of the damping of the first elastic member.

[0135] Specifically, it is known through experimental measurements that when the driving device and the second elastic member are in the second state, the first elastic member generates a large abutting force with the second elastic member and abuts against the third elastic member at the same time; at this time, the first elastic member has a larger natural frequency. Conversely, when the second elastic member only abuts against the first elastic member, the first elastic member has a smaller natural frequency than other states of the third working condition.

[0136] Therefore, when the first frequency is less than the first setting range, the driving end of the driving device is controlled to move a first setting distance in the direction of the second state; when the first frequency is greater than the first setting range, the driving end of the driving device is controlled to move a first setting distance in the direction of the first state.

[0137] In some embodiments, the first set distance is set to any value between 0.5 mm and 1 mm.

[0138] Further, after the step of determining the magnitude of the first frequency and the first setting range, and before the step of controlling the driving end of the driving device to move the first setting distance in the direction of the second state, the method further includes:

[0139] The optimal rigid body modal frequency of the suspension structure and the range extender as a whole is obtained when the range extender is not running and the non-running range extender is used as a shock-absorbing counterweight to obtain a second frequency; the second frequency is stored in a third database; the third database stores the correspondence between various states of the drive devices of the left suspension, the right suspension and the rear suspension in the third working condition and the rigid body modal frequency of the suspension structure and the range extender as a whole;

[0140] querying a third database according to the second frequency to obtain a third state of the left suspension drive device corresponding to the second frequency under a third working condition, obtaining a fourth state of the right suspension drive device corresponding to the second frequency under the third working condition, and obtaining a fifth state of the rear suspension drive device corresponding to the second frequency under the third working condition;

[0141] Controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the third state;

[0142] Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the fourth state;

[0143] The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the fifth state.

[0144] In some embodiments, the third database stores the correspondence between various states of the drive devices of the left suspension, right suspension, and rear suspension in the third working condition and the rigid body modal frequencies of the suspension structure and the range extender as a whole. Among them, the state between the first state and the second state is stored in sequence at intervals of 0.5 mm of the extended length of the drive end of the drive device; and the optimal rigid body modal frequencies of the suspension structure and the range extender as a whole under multiple states. The correspondence between the data is obtained in advance through experimental measurements and stored in the third database.

[0145] Specifically, by directly adjusting the position of the second elastic member to the state corresponding to each second elastic member at the optimal rigid body modal frequency of the suspension structure and the range extender as a whole, there is no need to debug and detect each state one by one. The second elastic member can be adjusted with the fastest efficiency, so that the entire suspension structure can provide the best vibration isolation effect at the first time and reduce vehicle vibration with the fastest efficiency.

[0146] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A variable limit suspension structure, characterized in that: The suspension body has an installation space, and the suspension body includes: A first elastic member, wherein two ends of the first elastic member are respectively fixedly connected to the inner side walls of the installation space of the suspension body, dividing the installation space into a first space and a second space; a second elastic member, the second elastic member being disposed in the first space and separated from the inner side wall of the suspension body by a gap; A driving device, the driving device is fixedly mounted on the outer side wall of the suspension body; the driving end of the driving device passes through the side wall of the suspension body and is fixedly connected to the second elastic member, and is used to drive the second elastic member to move relative to the extension direction of the driving end of the driving device; Wherein, the driving device has a first working condition, a second working condition and a third working condition; when in the first working condition, the driving end of the driving device is in an initial position, and there are gaps between the second elastic member and the inner wall of the first space and the first elastic member; when in the second working condition, the driving end of the driving device contracts, driving the second elastic member to abut against the inner wall of the first space; when in the third working condition, the driving end of the driving device extends, driving the second elastic member to abut against the first elastic member.

2. A variable limit suspension structure according to claim 1, characterized in that: The third operating condition also includes the first state, the second state, and any state between the first state and the second state; When the driving device is in the first state, the second elastic member abuts against the first elastic member and no interaction force is generated; when the driving device is in the second state, the second elastic member abuts against the first elastic member, the second elastic member generates a maximum compression deformation, and the first elastic member abuts against the inner wall of the second space; The compression deformation amount is the compression length generated by the abutment between the second elastic member and the first elastic member along the telescopic direction of the driving end of the driving device.

3. The variable limit suspension structure according to claim 2, characterized in that: A third elastic member is provided in the second space. The third elastic member is fixedly mounted on the inner wall of the second space and separated from the first elastic member by a gap. The third elastic member is used to abut against the first elastic member when the driving device is in the second state of the third working condition.

4. The variable limit suspension structure according to claim 3, characterized in that: A bracket is detachably mounted on one end of the second elastic member close to the inner wall of the first space, and a side of the bracket away from the second elastic member is fixedly connected to the driving end of the driving device.

5. A control method for the variable limit suspension structure according to claim 4, the suspension structure comprising: The left suspension, the right suspension and the rear suspension all have the suspension body, and are characterized by comprising: Obtain vehicle driving status and range extender operating status; querying a first database according to the driving state of the vehicle and the operating state of the range extender to obtain a first corresponding working condition of the second elastic member of the left suspension, a second corresponding working condition of the second elastic member of the right suspension, and a third corresponding working condition of the second elastic member of the rear suspension; the first database stores the corresponding working condition of each second elastic member included in the suspension structure under each driving state of the vehicle and each operating state of the range extender; Controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the first corresponding working condition; Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the second corresponding working condition; The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the third corresponding working condition.

6. The control method of a variable limit suspension structure according to claim 5, characterized in that: Before the step of obtaining the vehicle driving status and the range extender operating status is performed, the step also includes: After detecting that the vehicle is powered on, the steps of obtaining the vehicle driving state and the range extender operating state to controlling the drive device to drive the second elastic member to switch to the corresponding working condition are repeated with a first set time as a cycle until the vehicle is turned off.

7. The control method of a variable limit suspension structure according to claim 6, characterized in that: Before detecting that the vehicle is powered on, it also includes: Get the model of the current vehicle and obtain the model information of the vehicle; According to the vehicle model information, the second database is queried to obtain the first length of the second elastic member of the left suspension along the extension direction of the driving device, the second length of the second elastic member of the right suspension along the extension direction of the driving device, and the third length of the second elastic member of the rear suspension along the extension direction of the driving device corresponding to the vehicle model information; the second database stores the lengths of the second elastic member of the left suspension, the lengths of the second elastic member of the right suspension, and the lengths of the second elastic member of the rear suspension corresponding to various vehicle models; Mounting a second elastic member of the left suspension having a first length on the left suspension body; Installing a second elastic member of the right suspension having a second length onto the right suspension body; A second elastic member of the rear suspension having a third length is mounted on the rear suspension body.

8. The control method of a variable limit suspension structure according to claim 5, characterized in that: When the range extender is in a non-operating state, after the step of controlling the driving device to drive the second elastic member to switch to the corresponding working condition, the second elastic member is in a third working condition, and the method further includes: Obtaining the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain a first frequency; the first frequency includes the rigid body modal frequencies of the suspension structure and the range extender as a whole in multiple directions in the vehicle coordinate system; Determining whether the first frequency is within a first set range; When the first frequency is within the first setting range, the non-operating range extender is used as a shock-absorbing weight to improve the damping of the suspension structure; the first setting range is the frequency range in which the suspension structure and the range extender are used as a shock-absorbing weight as a whole; When the first frequency is not within the first set range, the driving device is controlled to adjust the state under the third working condition, thereby changing the compression deformation amount generated by the second elastic member, and returning to obtain the rigid body modal frequency of the suspension structure and the range extender as a whole to obtain the first frequency.

9. The control method of a variable limit suspension structure according to claim 8, characterized in that: When the first frequency is not within the first setting range, before controlling the driving device to adjust the state under the third working condition, the method further includes: Determine the magnitude of the first frequency and the first setting range, and when the first frequency is less than the minimum frequency of the first setting range, control the driving end of the driving device to move a first setting distance in the direction of the second state; When the first frequency is greater than the maximum frequency of the first setting range, the driving end of the driving device is controlled to move a first setting distance in the direction of the first state.

10. The control method of a variable limit suspension structure according to claim 9, characterized in that: After the step of determining the magnitude of the first frequency and the first setting range, and before the step of controlling the driving end of the driving device to move a first setting distance in the direction of the second state, the method further includes: The optimal rigid body modal frequency of the suspension structure and the range extender as a whole is obtained when the range extender is not in operation and the non-operating range extender is used as a shock-absorbing counterweight to obtain a second frequency; the second frequency is stored in a third database; the third database stores the correspondence between various states of the drive devices of the left suspension, the right suspension and the rear suspension in the third working condition and the rigid body modal frequency of the suspension structure and the range extender as a whole; querying a third database according to the second frequency to obtain a third state of the left suspension drive device corresponding to the second frequency under a third working condition, obtaining a fourth state of the right suspension drive device corresponding to the second frequency under the third working condition, and obtaining a fifth state of the rear suspension drive device corresponding to the second frequency under the third working condition; Controlling the driving device of the left suspension to drive the second elastic member of the left suspension to switch to the third state; Controlling the driving device of the right suspension to drive the second elastic member of the right suspension to switch to the fourth state; The driving device controlling the rear suspension drives the second elastic member of the rear suspension to switch to the fifth state.

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