Electric car and method for improving noise in electric car

Abstract

The invention discloses an electric car, an in-car noise improvement method thereof and a computer readable storage medium, and the improvement method comprises the following steps: adjusting a backlash of a transmission mechanism to enable a vibration value of a shell of the transmission mechanism to be smaller than or equal to a first preset threshold value; a first noise value of the adjusted noise in the electric car is obtained; in response to the fact that the first noise value is larger than a second preset threshold value, a first frequency value of tooth knocking sound of the supporting mechanism and a second frequency value of in-vehicle noise are obtained; and when the first frequency value is consistent with the second frequency value, performing frequency shift processing on the supporting mechanism so as to reduce the frequency of the supporting mechanism and improve the noise in the vehicle. Therefore, according to the improvement method, after the backlash of the transmission mechanism is adjusted, when the frequency value of the tooth knocking sound of the supporting mechanism is consistent with the frequency value of the noise in the vehicle, frequency shift processing is conducted on the supporting mechanism, so that the resonance effect of the supporting mechanism is restrained, the frequency of the supporting mechanism is reduced, and transmission of the tooth knocking sound of the supporting mechanism is reduced; and the noise in the vehicle is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to an electric vehicle and a method for improving the noise inside the vehicle. Background Art

[0002] The rapid economic development has promoted the growth of the number of cars owned by residents, but also aggravated energy shortages, environmental pollution and other issues. Energy and environmental issues are a major challenge facing the world, and electric vehicles have emerged. Electric vehicles use a power system composed of motors and reducers to replace the power system of traditional cars' engines and gearboxes, which makes electric vehicles lose the shielding effect of the engine, resulting in users' increasingly higher requirements for the NVH (Noise Vibration and Harshness) performance of electric vehicles.

[0003] In existing electric vehicles, when the accelerator is stepped on or released, the transmission power transmission in the transmission process will inevitably produce knocking problems, which makes it easy for users to feel the noise caused by the transmission in the car. Existing methods for improving noise in the car usually reduce noise by controlling the side clearance between the parts of the transmission mechanism, but since the side clearance of the transmission mechanism cannot be completely eliminated, users can still feel obvious noise in the car, and the improvement effect still needs to be improved. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a method for improving the noise inside a tram and a computer-readable storage medium.

[0005] To solve the above problems, the present application provides a first technical solution: a method for improving the interior noise of a tram, the tram comprising a transmission mechanism and a support mechanism, the support mechanism being used to support the transmission mechanism, the improvement method comprising: adjusting the side clearance of the transmission mechanism so that the vibration value of the shell of the transmission mechanism is less than or equal to a first preset threshold value; obtaining a first noise value of the interior noise of the tram after adjustment; in response to the first noise value being greater than a second preset threshold value, obtaining a first frequency value of the tooth knocking sound of the support mechanism and a second frequency value of the interior noise; when the first frequency value and the second frequency value are consistent, performing frequency shift processing on the support mechanism to reduce the frequency of the support mechanism and improve the interior noise.

[0006] Optionally, when the first frequency value and the second frequency value are consistent, the support mechanism is subjected to frequency shift processing to reduce the resonance frequency of the support mechanism and improve the noise inside the vehicle, including: when the first frequency value and the second frequency value are consistent, a suppression member is installed on the support mechanism to suppress the resonance of the support mechanism.

[0007] Optionally, the mass of the above-mentioned suppression member satisfies the following formula:

[0008]

[0009] Among them, m 1 is the mass of the suppression member, F is the frequency value of the tooth knocking sound of the above-mentioned support mechanism after frequency shift processing, k is the stiffness coefficient of the above-mentioned support mechanism, π is the circumference, m 2 is the mass of the supporting mechanism; or, the mass of the suppressing member is in the range of 300g to 600g.

[0010] Optionally, after the step of performing frequency shifting processing on the support mechanism to reduce the frequency of the support mechanism and improve the in-vehicle noise when the first frequency value and the second frequency value are consistent, the improvement method further includes: obtaining a second noise value of the in-vehicle noise of the tram after the frequency shifting processing; in response to the second noise value being greater than a third preset threshold, adjusting the torque zero-crossing curve of the tram to make the torque change of the tram tend to be smoother.

[0011] Optionally, in response to the second noise value being greater than a third preset threshold, the torque zero-crossing curve of the electric vehicle is adjusted to make the torque change of the electric vehicle tend to be smoother, including: in response to the second noise value being greater than a third preset threshold, adjusting the slope of the torque zero-crossing curve, or extending the duration of the torque zero-crossing curve to make the torque change of the electric vehicle tend to be smoother.

[0012] Optionally, the extended duration of the torque zero-crossing curve ranges from 250 ms to 500 ms.

[0013] Optionally, in response to the second noise value being greater than the third preset threshold, the torque zero-crossing curve of the electric vehicle is adjusted to make the torque change of the electric vehicle tend to be smoother, including: in response to the second noise value being greater than the third preset threshold and less than or equal to the fourth preset threshold, the duration of the torque zero-crossing curve is extended to the first time value; in response to the second noise value being greater than the fourth preset threshold, the duration of the torque zero-crossing curve is extended to the second time value, and the second time value is greater than the first time value.

[0014] Optionally, the first preset threshold is in a range of 1.8 to 2.5 gravitational accelerations.

[0015] In order to solve the above problems, the present application provides a second technical solution: providing an electric vehicle, comprising a transmission mechanism and a supporting mechanism; the transmission mechanism is used to transmit the motor torque; the transmission mechanism is arranged on the supporting mechanism, and the supporting mechanism is used to support the transmission mechanism; wherein the noise of the transmission mechanism and the supporting mechanism is improved by the above-mentioned improvement method.

[0016] To solve the above problems, the present application provides a third technical solution: an electric vehicle is provided, comprising a processor and a memory, the processor being connected to the memory, wherein the memory stores program instructions; the processor is used to execute the program instructions stored in the memory to implement the above improvement method.

[0017] The present application provides a method for improving the noise inside a tram and the noise inside the tram, and a computer-readable storage medium. The method adjusts the side clearance of the transmission mechanism so that the vibration value of the shell of the transmission mechanism is less than or equal to a first preset threshold value; obtains a first noise value of the adjusted noise inside the tram; in response to the first noise value being greater than a second preset threshold value, obtains a first frequency value of the knocking sound of the support mechanism and a second frequency value of the noise inside the tram; when the first frequency value and the second frequency value are consistent, performs frequency shift processing on the support mechanism to reduce the frequency of the support mechanism and improve the noise inside the tram. Therefore, after the improvement method of the present application adjusts the side clearance of the transmission mechanism to the maximum extent, when the first frequency value of the knocking sound of the support mechanism and the second frequency value of the noise inside the tram are consistent, the support mechanism can also perform frequency shift processing on the support mechanism to suppress the resonance effect of the support mechanism and reduce the frequency of the support mechanism, reduce the transmission of the knocking sound of the support mechanism, and achieve further improvement of the noise inside the tram. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 It is a flow chart of a first embodiment of a method for improving vehicle interior noise provided by the present application;

[0020] Figure 2 is a flow chart of a second embodiment of a method for improving vehicle interior noise provided by the present application;

[0021] Figure 3 is a flow chart of a third embodiment of the method for improving vehicle interior noise provided by the present application;

[0022] Figure 4 is a flow chart of a fourth embodiment of the method for improving vehicle interior noise provided by the present application;

[0023] Figure 5 is a structural schematic diagram of an embodiment of the electric vehicle provided by the present application;

[0024] Figure 6It is a structural schematic diagram of an embodiment of a computer-readable storage medium provided by the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0028] The embodiment of the present application first provides a method for improving the interior noise of an electric vehicle. Specifically, the electric vehicle in the embodiment of the present application includes an electric drive system, a transmission mechanism and a support mechanism. The electric drive system is used to provide driving force for the electric vehicle, the transmission system is used to transmit the motor torque generated by the electric drive system to the wheel part of the electric vehicle, and the support mechanism is used to support the electric drive system and the transmission mechanism.

[0029] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a first embodiment of a method for improving vehicle interior noise provided by the present application. Figure 1 As shown, in this embodiment, the improvement method includes the following steps:

[0030] Step S11: adjusting the side clearance of the transmission mechanism so that the vibration value of the housing of the transmission mechanism is less than or equal to a first preset threshold.

[0031] Specifically, the transmission mechanism of this embodiment may include a reducer, a differential and a half-axle. The reducer reduces the high-speed rotation of the electric drive system to the low-speed rotation required by the wheels through a gear set. The differential is used to drive the left and right wheels of the electric car to rotate at different speeds. The half-axle is used to connect the differential and the wheels to transmit power to the wheels. The side clearance of the transmission mechanism generally refers to the clearance between the gear sets. Exemplarily, the side clearance may include the following positions: the matching clearance between the gear sets inside the reducer, that is, the gap between the tooth profiles when the gears are meshed; the clearance at the structure where the spline and the gear are connected, such as the clearance at the matching place between the coupling sleeve / motor shaft and the reducer input shaft, and the side clearance between the external spline of the ball joint inside the drive shaft and the internal spline of the gear of the half-axle; the torsional clearance of the drive shaft of the electric drive system, etc.

[0032] Since the side clearance of the transmission mechanism can affect the dynamic meshing force fluctuation of the gear, thereby generating noise and vibration, the present embodiment reduces the side clearance of the transmission mechanism until the vibration value of the housing of the transmission mechanism is less than or equal to a first preset threshold value, so as to reduce abnormal noise generated during the operation of the transmission mechanism while ensuring the durability and performance of the gear.

[0033] Step S12: obtaining the adjusted first noise value of the interior noise of the electric train.

[0034] After adjusting the side clearance of the transmission mechanism, a first noise value of the interior noise of the tram after the adjustment is obtained. The first noise value of the interior noise of the tram may be a noise value obtained by a tester manually scoring the interior noise during the running of the tram, or may be a noise value obtained by detecting the noise during the running of the tram through a noise detection device in the tram, which is not specifically limited here.

[0035] Step S13: In response to the first noise value being greater than the second preset threshold, a first frequency value of the tooth knocking sound of the support mechanism and a second frequency value of the noise inside the vehicle are acquired.

[0036] After obtaining the first noise value, determine whether the first noise value is greater than the second preset threshold value. The second preset threshold value is a preset noise threshold value. The second preset threshold value can be adjusted according to the specific application scenario and model of the tram, and no specific limit is given here. In response to the first noise value being greater than the second preset threshold value, obtain the first frequency value of the tooth knocking sound of the support mechanism and the second frequency value of the noise inside the vehicle. Among them, the tooth knocking sound of the support mechanism and the noise inside the vehicle can be sampled by, but not limited to, an acoustic sensor, a vibrometer, a sound wave collection device, etc. to obtain the first frequency value and the second frequency value.

[0037] Step S14: When the first frequency value and the second frequency value are consistent, frequency shift processing is performed on the support mechanism to reduce the frequency of the support mechanism and improve the noise inside the vehicle.

[0038] Specifically, after obtaining the first frequency value and the second frequency value, it is determined whether the first frequency value and the second frequency value are consistent. When the first frequency value and the second frequency value are consistent, that is, the frequency of the noise inside the vehicle is the same as or close to the frequency of the tooth knocking sound of the support mechanism, the noise inside the vehicle may be caused by the resonance state of the tooth knocking sound of the support mechanism. Therefore, this embodiment performs frequency shift processing on the support mechanism to reduce the frequency of the support mechanism and improve the noise inside the vehicle.

[0039] Among them, the first frequency value and the second frequency value are consistent, which may mean that the first frequency value and the second frequency value tend to be the same, that is, the first frequency value and the second frequency value are equal, or the first frequency value and the second frequency value are close, and the difference between the first frequency value and the second frequency value is less than the fifth preset threshold.

[0040] In the embodiment of the present application, the method for improving the noise inside the vehicle is to adjust the side clearance of the transmission mechanism so that the vibration value of the shell of the transmission mechanism is less than or equal to the first preset threshold value; obtain the first noise value of the interior noise of the tram after adjustment; in response to the first noise value being greater than the second preset threshold value, obtain the first frequency value of the knocking sound of the support mechanism and the second frequency value of the interior noise; when the first frequency value and the second frequency value are consistent, perform frequency shift processing on the support mechanism to reduce the frequency of the support mechanism and improve the interior noise. Therefore, after the improvement method adjusts the side clearance of the transmission mechanism to the maximum extent, it can also perform frequency shift processing on the support mechanism when the first frequency value of the knocking sound of the support mechanism and the second frequency value of the interior noise are consistent, so as to suppress the resonance effect of the support mechanism and reduce the frequency of the support mechanism, reduce the transmission of the knocking sound of the support mechanism, and achieve further improvement of the interior noise.

[0041] In one embodiment, see Figure 2 , Figure 2 FIG. 2 is a flow chart of a second embodiment of the method for improving vehicle interior noise provided by the present application. Figure 2 As shown, the improvement method of this embodiment includes the following steps:

[0042] Step S21: adjusting the side clearance of the transmission mechanism so that the vibration value of the housing of the transmission mechanism is less than or equal to a first preset threshold.

[0043] Step S22: obtaining the adjusted first noise value of the interior noise of the electric train.

[0044] Step S23: In response to the first noise value being greater than the second preset threshold, a first frequency value of the tooth knocking sound of the support mechanism and a second frequency value of the noise inside the vehicle are acquired.

[0045] Step S21 to step S23 are similar to the above-mentioned step S11 to step S13 and will not be described in detail here.

[0046] Step S24: When the first frequency value and the second frequency value are consistent, installing a suppression member on the support mechanism to suppress resonance of the support mechanism.

[0047] Specifically, when the first frequency value and the second frequency value are consistent, that is, the frequency of the noise inside the vehicle is the same as or close to the frequency of the tooth knocking sound of the support mechanism, the noise inside the vehicle may be caused by the resonance state of the tooth knocking sound of the support mechanism. Therefore, this embodiment suppresses the resonance state of the support mechanism by installing a suppression part on the support mechanism, changing the mode of the support mechanism and reducing the frequency of the support mechanism, thereby improving the improvement effect of the noise inside the vehicle.

[0048] Optionally, in one embodiment, the mass of the suppression member satisfies the following formula:

[0049]

[0050] Among them, m 1 is the mass of the suppression part, F is the frequency value of the tooth knocking sound of the support mechanism after frequency shift processing, k is the stiffness coefficient of the support mechanism, π is the circumference, m 2 To support the quality of the organization.

[0051] Specifically, the support mechanism may be a suspension bracket of a tram, and the support mechanism is used to support and install the electric drive system and the transmission mechanism, and the electric drive system and the transmission mechanism are connected to the body of the tram through the support mechanism. In this embodiment, the frequency value F of the tooth knocking sound of the support mechanism after the frequency shift processing is pre-set, and the frequency value F, the stiffness coefficient of the support mechanism, and the mass m of the support mechanism can be used to calculate the tooth knocking sound of the support mechanism. 2 The mass of the suppression member is calculated to improve the resonance suppression effect of the suppression member, further reduce the transmission of the tooth knocking sound of the support mechanism, and improve the improvement effect of the noise inside the vehicle.

[0052] In another embodiment, the mass of the inhibitor is in a range of 300 g to 600 g.

[0053] Specifically, the mass of the suppression member may be 300g, 350g, 400g, 450g, 500g, 550g or 600g. By setting the mass range of the suppression member between 300g and 600g, the resonance suppression effect of the suppression member can be improved while ensuring the stable support effect of the support mechanism.

[0054] Furthermore, the mass of the suppression component can be calculated according to the above formula, or can be selected within the above mass range, or the mass of the suppression component can be selected with the minimum mass or the maximum mass according to the above two methods, which is not specifically limited here.

[0055] In other embodiments, the modal structure of the support mechanism can be adjusted to avoid the frequency value of the tooth knocking sound of the support mechanism being the same as the frequency value of the noise inside the vehicle, and / or to avoid the frequency value of the tooth knocking sound of the support mechanism being the same as the frequency value of the sound of the electric drive system, thereby reducing the impact of the resonance state of the support mechanism on the NVH performance and improving the effect of improving the noise inside the vehicle.

[0056] In one embodiment, see Figure 3 , Figure 3 FIG. 2 is a flow chart of a third embodiment of the method for improving vehicle interior noise provided by the present application. Figure 3 As shown, after step S14, the improvement method further includes the following steps:

[0057] Step S15: obtaining a second noise value of the interior noise of the electric train after the frequency shift processing.

[0058] Specifically, after the frequency shift processing is performed on the support mechanism, a second noise value of the vehicle interior noise after the frequency shift processing is obtained. The second noise value may be a noise value obtained by a tester manually scoring the vehicle interior noise during the running of the tram, or may be a noise value obtained by detecting the noise during the running of the tram through a noise detection device in the tram, which is not specifically limited here.

[0059] Step S16: In response to the second noise value being greater than the third preset threshold, adjusting the torque zero-crossing curve of the electric vehicle to make the torque change of the electric vehicle tend to be smooth.

[0060] Specifically, when the second noise value is greater than the third preset threshold, it means that the in-vehicle noise after the frequency shift processing still has a certain impact. At this time, the torque zero-crossing curve of the electric vehicle is further obtained, and the torque zero-crossing curve of the electric vehicle is adjusted to make the torque change of the electric vehicle tend to be gentle. Among them, the torque zero-crossing curve refers to the curve process of the motor torque changing from positive to negative or from negative to positive. By adjusting the torque zero-crossing curve, the motor torque can be controlled to be zero-crossing within the torque zero-crossing interval to reduce the instantaneous speed fluctuation when the positive and negative torques of the motor are switched, so that the torque changes more gently, reduce the impact of the motor on the transmission mechanism, improve the smoothness of the whole vehicle, and further improve the improvement effect of the in-vehicle noise.

[0061] Furthermore, the third preset threshold may be the same as the second preset threshold, or may be slightly smaller than the second preset threshold, which is not specifically limited herein.

[0062] Optionally, step S16 further includes the following steps: in response to the second noise value being greater than a third preset threshold, adjusting the slope of the torque zero-crossing curve, or extending the duration of the torque zero-crossing curve, so that the torque change of the electric vehicle tends to be smooth.

[0063] Specifically, the process of adjusting the torque zero-crossing curve of the electric vehicle may include adjusting the slope of the torque zero-crossing curve, or extending the duration of the torque zero-crossing curve. For example, the slope of the torque zero-crossing curve may be adjusted toward 0 to make the torque change more smoothly; or the duration of the torque zero-crossing interval in the torque zero-crossing curve may be extended to make the torque zero-crossing duration longer and the torque change more smoothly.

[0064] In an embodiment of the present application, by adjusting the slope of the torque zero-crossing curve when the second noise value is greater than the third preset threshold, or extending the duration of the torque zero-crossing curve, so that the torque change of the electric vehicle tends to be smoother, the impact of the motor on the transmission mechanism can be effectively reduced, the smoothness of the vehicle can be improved, and the improvement effect of the noise inside the vehicle can be further improved.

[0065] Furthermore, the duration of the extended torque zero-crossing curve ranges from 250 ms to 500 ms.

[0066] Specifically, the duration of the extended torque zero-crossing curve can be 250ms, 300ms, 350ms, 400ms, 450ms or 500ms. It can be understood that when the duration of the torque zero-crossing curve is less than 250ms, the impact of the motor on the transmission mechanism during the running of the tram will increase, and the shaking or noise in the car will be more obvious, resulting in a low user experience; when the duration of the torque zero-crossing curve is greater than 500ms, the rate of change of the motor torque will be too small, the torque control effect of the motor is poor, and the driving experience is poor. Therefore, this embodiment controls the duration range of the extended torque zero-crossing curve to between 250ms and 500ms, so as to improve the torque control effect during driving while ensuring the smoothness and comfort of the tram.

[0067] Optionally, see Figure 4 , Figure 4 FIG. 4 is a flow chart of a fourth embodiment of the method for improving vehicle interior noise provided by the present application. Figure 4 As shown, step S16 further includes the following steps:

[0068] Step S161: In response to the second noise value being greater than the third preset threshold and less than or equal to the fourth preset threshold, extending the duration of the torque zero-crossing curve to a first time value.

[0069] Specifically, the fourth preset threshold is greater than the third preset threshold. When the second noise value is greater than the third preset threshold and less than or equal to the fourth preset threshold, it means that the noise value of the vehicle interior noise after the frequency shift processing is within the noise interval of the third preset threshold and the fourth preset threshold, and the vehicle interior noise after the frequency shift processing is at a relatively low level. At this time, the duration of the torque zero-crossing curve can be extended to the first time.

[0070] Step S162: In response to the second noise value being greater than a fourth preset threshold, extending the duration of the torque zero-crossing curve to a second time value, where the second time value is greater than the first time value.

[0071] Specifically, when the second noise value is greater than the fourth preset threshold, it means that the vehicle interior noise after the frequency shift processing is at a high level, so the duration of the torque zero-crossing curve can be extended to a second time value, and the second time value is greater than the first time value. Exemplarily, the first time value and the second time value can be between 250ms and 500ms, for example, the first time value is 300ms and the second time value is 350ms.

[0072] In an embodiment of the present application, the improvement method extends the duration of the torque zero-crossing curve to the first time value in response to the second noise value being greater than the third preset threshold and less than or equal to the fourth preset threshold, and extends the duration of the torque zero-crossing curve to the second time value in response to the second noise value being greater than the fourth preset threshold, so that when the in-vehicle noise after frequency shifting processing is at a lower level or a higher level, the corresponding duration extension operation can be performed to improve the torque control effect during driving while ensuring the smoothness and comfort of the electric vehicle.

[0073] In other possible implementations, step S16 may also divide the second noise value into multiple noise levels, not limited to the lower and higher levels mentioned above, so as to adjust the duration of multiple gears of the torque zero crossing curve, which is not specifically limited here.

[0074] In one embodiment, the first preset threshold is in a range between 1.8 and 2.5 gravitational accelerations.

[0075] Specifically, the vibration value of the housing of the transmission mechanism is used to measure the vibration degree of the transmission mechanism during operation, and the vibration value can be measured by the unit of vibration acceleration. The first preset threshold value can be 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4 or 2.5 gravity accelerations, or the first preset threshold value can be 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4 or 2.5 and 9.81 m / s 2 Alternatively, the first preset threshold may be 17.658, 18.639, 19.620, 20.601, 21.582, 22.563, 23.544 or 24.525 m / s 2 The product value of .

[0076] When the first preset threshold is greater than 2.5 gravitational accelerations, that is, the vibration value of the transmission mechanism housing is too large, the noise generated by the vibration between the gears of the transmission mechanism is too large, and the improvement effect of the noise inside the vehicle is poor, which is not conducive to improving the user experience. When the first preset threshold is less than 1.8 gravitational accelerations, that is, the vibration value of the transmission mechanism housing is too small, the side clearance of the transmission mechanism is too small, and the durability and performance of the gear are affected. Therefore, this embodiment sets the vibration value of the transmission mechanism housing between 1.8 and 2.5 gravitational accelerations, which can achieve good control of the side clearance of the transmission mechanism and reduce the impact of the small side clearance of the transmission mechanism on the life of the gear, thereby ensuring the durability of the gear while improving the noise caused by the transmission mechanism, and further improving the improvement effect of the noise inside the vehicle.

[0077] The embodiment of the present application further proposes an electric vehicle, which includes a transmission mechanism and a supporting mechanism. The transmission mechanism is used to transmit motor torque. The transmission mechanism is arranged on the supporting mechanism, and the supporting mechanism is used to support the transmission mechanism.

[0078] Specifically, the electric car may further include a cabin inside the electric car, and the cabin is arranged on one side of the support mechanism. By adjusting the transmission mechanism and the support mechanism through the method for improving the interior noise of the car in any of the above embodiments, the interior noise of the cabin can be improved, which can effectively reduce the impact of the interior noise on the user and improve the user experience.

[0079] See also Figure 5 , Figure 5 FIG. 1 is a schematic diagram of the structure of an embodiment of the electric vehicle provided by the present application. Figure 5 As shown, the electric vehicle 50 of this embodiment includes a memory 52 and a processor 51, and the processor 51 is connected to the memory 52. ​​The memory 52 is used to store program instructions. The processor 51 is used to execute the program instructions stored in the memory 52 to implement the improvement method described in any of the above embodiments.

[0080] The processor 51 may also be referred to as a CPU (Central Processing Unit). The processor 51 may be an integrated circuit chip having the ability to process signals. The processor 51 may also be a general-purpose processor, a digital signaling processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0081] The memory 52 can be a memory stick, a TF card, etc., which can store all the information in the electric car 50, including the input raw data, computer programs, intermediate operation results and final operation results are all stored in the memory. It stores and retrieves information according to the location specified by the controller. With the memory, the string matching prediction device has a memory function and can ensure normal operation. The memory of the string matching prediction device can be divided into main memory (internal memory) and auxiliary memory (external memory) according to the purpose. There is also a classification method of dividing it into external memory and internal memory. External memory is usually a magnetic medium or an optical disk, etc., which can store information for a long time. Memory refers to the storage component on the motherboard, which is used to store the data and programs currently being executed, but is only used to temporarily store programs and data. If the power is turned off or the power is cut off, the data will be lost.

[0082] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the improvement methods described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0083] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0084] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0085] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a system server, or a network device, etc.) or a processor to execute all or part of the steps of the various implementation methods of the present application.

[0086] See also Figure 6 , Figure 6 Schematic diagram of the structure of an embodiment of the computer-readable storage medium provided by the present application. Figure 6 As shown, the computer-readable storage medium of the present application stores program instructions 61 that can implement all the above methods, wherein the program instructions 61 can be stored in the above storage medium in the form of a software product, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of each implementation method of the present application. The aforementioned storage device includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, etc., which can store program codes, or a computer, server, mobile phone, tablet, etc.

[0087] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for improving the noise inside a train, characterized in that: The electric vehicle comprises a transmission mechanism and a support mechanism, wherein the support mechanism is used to support the transmission mechanism, and the improvement method comprises: Adjusting the side clearance of the transmission mechanism so that the vibration value of the housing of the transmission mechanism is less than or equal to a first preset threshold; Acquiring an adjusted first noise value of the interior noise of the tram; In response to the first noise value being greater than a second preset threshold, acquiring a first frequency value of the tooth knocking sound of the support mechanism and a second frequency value of the vehicle interior noise; When the first frequency value and the second frequency value are consistent, the support mechanism is subjected to frequency shift processing to reduce the frequency of the support mechanism and improve the in-vehicle noise.

2. The improvement method according to claim 1, characterized in that: When the first frequency value and the second frequency value are consistent, performing frequency shift processing on the support mechanism to reduce the resonance frequency of the support mechanism and improve the in-vehicle noise, including: When the first frequency value and the second frequency value are consistent, a suppression member is installed on the support mechanism to suppress resonance of the support mechanism.

3. The improvement method according to claim 2, characterized in that: The mass of the suppression member satisfies the following formula: Wherein, m1 is the mass of the suppression member, F is the frequency value of the tooth knocking sound of the support mechanism after frequency shift processing, k is the stiffness coefficient of the support mechanism, π is the circumference, and m2 is the mass of the support mechanism; Alternatively, the mass of the suppression member ranges from 300 g to 600 g.

4. The improvement method according to claim 1, characterized in that: After the step of performing frequency shift processing on the support mechanism to reduce the frequency of the support mechanism and improve the noise inside the vehicle when the first frequency value and the second frequency value are consistent, the improvement method further includes: Acquire a second noise value of the interior noise of the tram after frequency shift processing; In response to the second noise value being greater than a third preset threshold, the torque zero-crossing curve of the electric vehicle is adjusted to make the torque change of the electric vehicle tend to be smooth.

5. The improvement method according to claim 4, characterized in that: In response to the second noise value being greater than a third preset threshold, adjusting the torque zero-crossing curve of the electric vehicle so that the torque change of the electric vehicle tends to be smooth, including: In response to the second noise value being greater than a third preset threshold, the slope of the torque zero-crossing curve is adjusted, or the duration of the torque zero-crossing curve is extended, so that the torque change of the electric vehicle tends to be smooth.

6. The improvement method according to claim 5, characterized in that: The extended duration of the torque zero-crossing curve ranges from 250 ms to 500 ms.

7. The improvement method according to claim 4 or 5, characterized in that: In response to the second noise value being greater than a third preset threshold, adjusting the torque zero-crossing curve of the electric vehicle so that the torque change of the electric vehicle tends to be smooth, including: In response to the second noise value being greater than the third preset threshold and less than or equal to a fourth preset threshold, extending the duration of the torque zero-crossing curve to a first time value; In response to the second noise value being greater than the fourth preset threshold, the duration of the torque zero-crossing curve is extended to a second time value, wherein the second time value is greater than the first time value.

8. The improvement method according to claim 1, characterized in that: The first preset threshold value ranges from 1.8 to 2.5 gravitational accelerations.

9. A tram, characterized in that: include: A transmission mechanism for transmitting motor torque; A supporting mechanism, the transmission mechanism is arranged on the supporting mechanism, and the supporting mechanism is used to support the transmission mechanism; Wherein, the transmission mechanism and the support mechanism are noise-modified by the improvement method according to any one of claims 1-8.

10. A tram, characterized in that: The method comprises a processor and a memory, wherein the processor is connected to the memory, wherein: The memory stores program instructions; The processor is used to execute the program instructions stored in the memory to implement the improvement method according to any one of claims 1-8.

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