Control method and device of electric vehicle, vehicle-mounted audio system

Abstract

The application discloses a control method and device of an electric vehicle, and a vehicle-mounted audio system, wherein the electric vehicle is provided with the vehicle-mounted audio system, the vehicle-mounted audio system has a low-power consumption mode, and the control method comprises the following steps: detecting the residual power of the electric vehicle; judging whether the residual power of the electric vehicle is lower than a preset value; and if the residual power of the electric vehicle is lower than the preset value, starting the low-power consumption mode. When the residual power of the electric vehicle is lower than the preset value, the low-power consumption mode of the vehicle-mounted audio system is started, the power consumption of the vehicle-mounted audio system is reduced under the condition of guaranteeing the basic function of the vehicle-mounted audio system, and the endurance of the electric vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, and more particularly, to a control method and device for an electric vehicle and an in-vehicle audio system. BACKGROUND

[0002] In current electric vehicle design, the driving range is an important factor. The in-vehicle speaker system generally includes subwoofer, woofer, midrange and tweeter. For most audio signals, the spectral energy is mainly concentrated in the low frequency region. When the electric vehicle has low power, the in-vehicle speaker still plays many low frequency signal components, reducing the driving range of the electric vehicle. SUMMARY

[0003] An object of the present application is to provide a new technical solution for an electric vehicle.

[0004] According to a first aspect of the present application, there is provided a control method for an electric vehicle, the electric vehicle being provided with an in-vehicle audio system, the in-vehicle audio system having a low-power consumption mode, the control method comprising:

[0005] detecting the remaining power of the electric vehicle;

[0006] determining whether the remaining power of the electric vehicle is lower than a preset value;

[0007] if the remaining power of the electric vehicle is lower than the preset value, starting the low-power consumption mode.

[0008] Optionally, the in-vehicle audio system includes a subwoofer and / or a woofer.

[0009] The starting of the low-power consumption mode includes:

[0010] increasing the cutoff frequency of a high-pass filter provided in the subwoofer and / or the woofer.

[0011] Optionally, the increasing of the cutoff frequency of the high-pass filter provided in the subwoofer and / or the woofer includes:

[0012] when it is detected that the remaining power of the electric vehicle is less than or equal to a first preset value and greater than a second preset value, increasing the cutoff frequency of the high-pass filter in the subwoofer and / or the woofer to a first cutoff frequency;

[0013] when it is detected that the remaining power of the electric vehicle is less than or equal to the second preset value, increasing the cutoff frequency of the high-pass filter in the subwoofer and / or the woofer to a second cutoff frequency;

[0014] The second preset value is less than the first preset value, and the second cutoff frequency is greater than the first cutoff frequency.

[0015] Optionally, the starting of the low-power-consumption mode comprises:

[0016] A negative gain is applied to a low-frequency band of the audio signal in the vehicle-mounted audio system, and the low-frequency band of the audio signal ranges from 20 Hz to 250 Hz.

[0017] Optionally, the starting of the low-power-consumption mode comprises:

[0018] Detecting whether there is a passenger on a seat corresponding to a loudspeaker included in the vehicle-mounted audio system;

[0019] If not, the loudspeaker is turned off.

[0020] Optionally, an equalizer is arranged in the vehicle-mounted audio system.

[0021] The starting of the low-power-consumption mode of the vehicle-mounted audio system comprises:

[0022] A positive gain applied to the audio signal in an equalizer debugging process is reduced.

[0023] Optionally, the starting of the low-power-consumption mode comprises:

[0024] If the remaining power of the electric vehicle is less than the preset value, a prompt is popped up and a question is asked whether to start the low-power-consumption mode.

[0025] According to a second aspect of the present application, a control device of an electric vehicle is provided, which is used to implement the control method according to the first aspect of the present application, and the control device comprises:

[0026] A power detection module is configured to detect the remaining power of the electric vehicle and determine whether the remaining power of the electric vehicle is less than a preset value.

[0027] A vehicle-mounted audio system control module is configured to start a low-power-consumption mode of the vehicle-mounted audio system when the remaining power of the electric vehicle is less than a preset value.

[0028] Optionally, the control device further comprises:

[0029] A seat detection module is configured to detect whether there is a passenger on a seat corresponding to a loudspeaker included in the vehicle-mounted audio system.

[0030] According to a third aspect of the present application, there is provided a vehicle audio system having a low power consumption mode, which can be implemented after the method according to the first aspect of the present application.

[0031] According to one embodiment of the present application, the present application reduces the power consumption of the vehicle audio system and improves the endurance of the electric vehicle by starting the low power consumption mode of the vehicle audio system when the remaining power of the electric vehicle is lower than a preset value, under the condition of ensuring the basic functions of the vehicle audio system.

[0032] Other features and advantages of the present application will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0034] Figure 1 is a flow chart of a control method of an electric vehicle in an embodiment of the present application.

[0035] Figure 2 is a schematic diagram of a human voice frequency in an embodiment of the present application.

[0036] Figure 3 is a schematic diagram of applying a negative gain to a low frequency band of an audio signal in an embodiment of the present application.

[0037] Figures 4(a)-4(b) is a schematic diagram of an equalizer debugging in an embodiment of the present application.

[0038] Figure 5 is a functional module diagram of a control device of an electric vehicle in an embodiment of the present application.

[0039] Figure 6 is a functional module diagram of a control device of an electric vehicle in another embodiment of the present application.

[0040] Figure 7 is a functional module diagram of a vehicle audio system in an embodiment of the present application. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values, unless specifically stated otherwise, do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0043] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can have not been discussed in any great detail in order to avoid obscuring the present description.

[0044] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0045] It should be noted that like reference numerals and letters refer to like items throughout the attached drawings, and thus once an item is defined in one drawing, it is not necessarily required that it be further discussed in subsequent drawings.

[0046] As shown in Figure 1 The embodiment of the present application introduces a control method of an electric vehicle, the electric vehicle is provided with an on-board audio system, the on-board audio system has a low-power mode, and the control method comprises steps S1-S3.

[0047] S1: detecting the residual power of the electric vehicle.

[0048] S2: judging whether the residual power of the electric vehicle is lower than a preset value.

[0049] S3: if the residual power of the electric vehicle is lower than the preset value, starting the low-power mode.

[0050] Generally, the on-board audio system is provided in the electric vehicle to provide the user with functions such as calling, navigation, and music playing, and the on-board audio system is powered by the battery of the electric vehicle when working. Meanwhile, the battery of the electric vehicle also provides energy for the normal driving of the electric vehicle, and compared with the functions provided by the on-board audio system, it is more important to ensure the normal driving of the electric vehicle, and the battery of the electric vehicle should preferentially provide energy for the normal driving of the electric vehicle.

[0051] In the present application, the normal mode and the low-power mode are preset in the on-board audio system of the electric vehicle, when the residual power of the electric vehicle is higher than the preset value, the on-board audio system can work in the normal mode. When the residual power of the electric vehicle is lower than the preset value, in order to preferentially ensure the normal driving of the electric vehicle, the on-board audio system works in the low-power mode. For example, in the low-power mode, the on-board audio system can only retain the necessary functions related to the normal driving of the electric vehicle, such as calling and navigation.

[0052] The user can set the preset value according to actual needs. For example, the electric vehicle mainly travels long distances, and the electric vehicle needs to travel a long distance before charging the battery. In this case, the user can increase the preset value to avoid the electric vehicle running out of battery before reaching a charging location. For example, the electric vehicle mainly travels short distances, and the electric vehicle can often encounter a location that can charge the battery during travel. In this case, the user does not need to worry about not being able to reach a location that can charge the battery before the electric vehicle runs out of power. The user can lower the preset value to ensure that all functions of the car audio system work normally and improve the user's experience.

[0053] The application reduces the power consumption of the car audio system and improves the endurance of the electric vehicle by starting the low-power mode of the car audio system when the remaining power of the electric vehicle is lower than the preset value, while ensuring the basic functions of the car audio system.

[0054] In one embodiment of the application, the car audio system includes a subwoofer and / or a woofer, and the step S3 includes increasing the cutoff frequency of the high-pass filter provided in the subwoofer and / or the woofer.

[0055] In the subwoofer and the woofer, a high-pass filter is provided. Only when the frequency of the audio signal is higher than the cutoff frequency of the high-pass filter can the audio signal pass through the high-pass filter, otherwise it will be intercepted by the high-pass filter. The cutoff frequency of the high-pass filter of the subwoofer and the woofer is relatively low, for example, only 20 Hz. Generally, the audio signal includes low-frequency signals, medium-frequency signals and high-frequency signals. For most audio signals, the spectral energy is mainly concentrated in the low-frequency region. By reducing the low-frequency signal component in the audio signal, the energy of the audio signal can be reduced.

[0056] In one example, the car audio system is provided with a subwoofer. After starting the low-power mode of the car audio system, the cutoff frequency of the high-pass filter provided in the subwoofer is increased.

[0057] In one example, the car audio system is provided with a woofer. After starting the low-power mode of the car audio system, the cutoff frequency of the high-pass filter provided in the woofer is increased.

[0058] In one example, a bass speaker and a subwoofer are provided in a car audio system, after the car audio system is started in a low-power mode, the cut-off frequency of a high-pass filter provided in the bass speaker and the subwoofer is increased. The cut-off frequency of the high-pass filter in the bass speaker and the subwoofer is increased from 20 Hz to 250 Hz, and the low-frequency signal components in the audio signal with a frequency lower than 250 Hz are all intercepted by the high-pass filter, thereby reducing the energy of the audio signal. The cut-off frequency of the high-pass filter can be adjusted according to actual conditions, which is not limited herein.

[0059] In one embodiment of the present application, when it is detected that the remaining power of the electric vehicle is less than or equal to a first preset value and greater than a second preset value, the cut-off frequency of the high-pass filter in the bass speaker and / or the subwoofer is increased to a first cut-off frequency.

[0060] When it is detected that the remaining power of the electric vehicle is less than or equal to the second preset value, the cut-off frequency of the high-pass filter in the bass speaker and / or the subwoofer is increased to a second cut-off frequency.

[0061] Wherein, the second preset value is less than the first preset value, and the second cut-off frequency is greater than the first cut-off frequency.

[0062] As shown in Figure 2 The abscissa represents the frequency of the sound signal, and the figure shows the frequency range of several different human voice signals, such as the frequency range of soprano, alto, tenor, baritone, and bass, and it can be seen that the frequency of the human voice signal is mainly below 1000 Hz. In the present embodiment, the cut-off frequency of the high-pass filter in the bass speaker and the subwoofer is preset with a first cut-off frequency and a second cut-off frequency, and the remaining power of the electric vehicle is preset with a first preset value and a second preset value. When the remaining power of the electric vehicle is less than or equal to the first preset value and greater than the second preset value, the cut-off frequency of the high-pass filter in the bass speaker and the subwoofer is set to the first cut-off frequency, and when the remaining power of the electric vehicle is less than or equal to the second preset value, the cut-off frequency of the high-pass filter in the bass speaker and the subwoofer is set to the second cut-off frequency, wherein the first preset value is greater than the second preset value, and the first cut-off frequency is less than the second cut-off frequency. The first cut-off frequency and the second cut-off frequency are obtained by pre-test.

[0063] For example, the first cutoff frequency is 200 Hz, the second cutoff frequency is 315 Hz, the first preset value is 50% of the total power of the electric vehicle, and the second preset value is 20% of the total power of the electric vehicle. When the remaining power of the electric vehicle is less than 50%, the low-power mode of the vehicle audio system is turned on, at this time, the remaining power of the electric vehicle is relatively large, and the distortion of the human voice signal can be considered first, the cutoff frequency of the high-pass filter is set to 200 Hz, which can ensure that most of the human voice fundamental frequency will not be lost, and at the same time, the energy of the audio signal is reduced. When the remaining power of the electric vehicle is less than 20%, at this time, the remaining power of the electric vehicle is relatively small, and the problem of electric vehicle endurance needs to be considered first, at this time, the cutoff frequency of the high-pass filter is further increased, the cutoff frequency of the high-pass filter is set to 315 Hz, and more low-frequency signals are filtered out by the high-pass filter, which will cause relatively large distortion to the human voice signal, and at the same time, the energy of the audio signal is further reduced.

[0064] The vehicle audio system further includes a mid-range speaker and a high-range speaker, and the subwoofer, the woofer and the mid-range speaker, and the high-range speaker are used in combination. When the vehicle audio system plays navigation information, for example, the vehicle audio system plays "there is a traffic light 300 meters ahead", after increasing the cutoff frequency of the high-pass filter in the subwoofer and the woofer, only medium frequency signals and high frequency signals with a frequency of more than 250 Hz are included in the audio signal, the mid-range speaker and the high-range speaker play normally, and the user still hears "there is a traffic light 300 meters ahead", the content heard by the user remains unchanged, but the low frequency signal output by the subwoofer and the woofer is reduced.

[0065] The present application increases the cutoff frequency of the high-pass filter arranged in the subwoofer and the woofer, reduces the low frequency signal component included in the audio signal, reduces the energy of the audio signal, reduces the power consumption of the vehicle audio system, and improves the endurance of the electric vehicle.

[0066] In an embodiment of the present application, the step S3 includes applying negative gain to the low frequency band of the audio signal in the vehicle audio system, and the frequency range of the low frequency band of the audio signal is 20 Hz to 250 Hz.

[0067] Since the spectral energy of the audio signal is mainly concentrated in the low frequency region, by reducing the low frequency signal component in the audio signal, the energy of the audio signal can be reduced. In the present embodiment, by applying negative gain to the frequency band of 20 Hz to 250 Hz in the audio signal, the low frequency signal component in the audio signal is reduced.

[0068] The value of the negative gain to be applied can be determined through pre-testing, ensuring that the sound will not be distorted after applying the negative gain, and the user can still clearly hear the content played by the car audio system. In one example, when the car audio system is playing navigation information, such as "turn right at the traffic light ahead," applying negative gain to the low-frequency band of the audio signal reduces the low-frequency signal components. Because the applied negative gain is obtained through pre-testing, the sound is not distorted after applying the negative gain, and the user still hears "turn right at the traffic light ahead," and the content heard by the car audio system remains unchanged.

[0069] In one embodiment of the present invention, applying a negative gain to the low-frequency band of an audio signal in the vehicle audio system includes: acquiring the frequency of the audio signal to which a negative gain needs to be applied; acquiring the negative gain to be applied from a preset correspondence between the frequency of the audio signal and the negative gain based on the acquired frequency of the audio signal; and applying the negative gain to the audio signal based on the acquired negative gain to be applied.

[0070] like Figure 3 As shown, in one example, a pre-defined correspondence between audio signal frequency and negative gain is established. When applying negative gain to the low-frequency band of the audio signal in the vehicle audio system, different negative gains can be applied to different frequency bands of the audio signal. When applying negative gain, the required negative gain is obtained from the pre-stored correspondence based on the audio signal frequency. This correspondence between audio signal frequency and negative gain is determined through pre-testing. For example, for a signal with a frequency of 40 Hz, the applied gain is -13.4 dB; for a signal with a frequency of 50 Hz, the applied gain is -11.6 dB; for a signal with a frequency of 63 Hz, the applied gain is -3.5 dB; for a signal with a frequency of 80 Hz, the applied gain is -10.5 dB; for a signal with a frequency of 100 Hz, the applied gain is -6.4 dB; for a signal with a frequency of 125 Hz, the applied gain is -3.5 dB; and for a signal with a frequency of 160 Hz, the applied gain is -7 dB. Audio signals consist of multiple frequency bands, and the energy of different audio signals within the same frequency band varies. By applying different negative gains to different frequency bands in an audio signal, the energy of the audio signal can be reduced as much as possible while minimizing audio signal distortion.

[0071] This invention reduces the low-frequency signal components in the audio signal by applying a negative gain to the low-frequency band of the audio signal, thereby reducing the energy of the audio signal, which in turn reduces the power consumption of the in-vehicle audio system and improves the driving range of electric vehicles.

[0072] In one embodiment of the present application, the step S3 comprises: detecting whether there is a passenger in the seat near each loudspeaker contained in the vehicle audio system; and if not, turning off the loudspeaker.

[0073] For an ordinary electric private car, since the number of passengers is small and the internal space is relatively small, the vehicle audio system only needs one loudspeaker to meet the user's use demand. For an electric vehicle with more seats, such as an electric bus, since the internal space of the electric bus is large, if the number of loudspeakers contained in the vehicle audio system is small, it will affect the auditory experience of the passengers. In order to ensure the auditory experience of all passengers, multiple loudspeakers are contained in the vehicle audio system and are arranged at different positions of the electric bus, and the number of loudspeakers increases with the increase of the number of seats of the electric vehicle.

[0074] In one example, for an electric bus with 10 rows of seats, one loudspeaker is arranged above each row of seats. Since there may be empty seats in actual use, there are no passengers on some seats, such as the last three rows of seats of the electric bus. If the loudspeakers corresponding to the last three rows of seats of the electric bus are still turned on in this case, it will cause waste of electric power, and the loudspeakers corresponding to the last three rows of seats can be turned off at this time to reduce the consumption of electric power.

[0075] In one example, for an electric bus with 10 rows of seats, one loudspeaker is arranged above each row of seats. Since there may be empty seats in actual use, there are no passengers on some seats, such as the last three rows of seats of the electric bus. If the loudspeakers corresponding to the last three rows of seats of the electric bus are still turned on in this case, it will cause waste of electric power, and the loudspeakers corresponding to the last three rows of seats can be turned off at this time to reduce the consumption of electric power.

[0076] The present application detects whether there is a passenger on the seat of the electric vehicle, and if there is no passenger on the seat of the electric vehicle, the loudspeaker corresponding to the seat without a passenger is turned off, thereby avoiding unnecessary consumption of electric power, reducing the power consumption of the vehicle audio system, and improving the endurance of the electric vehicle.

[0077] In one embodiment of the present application, an equalizer is arranged in the vehicle audio system, and the step S3 comprises: reducing the positive gain applied to the audio signal in the equalizer debugging process.

[0078] An equalizer is provided in a vehicle audio system, the equalizer corrects sound by adjusting different frequency components contained in an audio signal, and the equalizer can adjust low frequency signals, medium frequency signals and high frequency signals contained in the audio signal respectively to improve sound quality. During the debugging process of the equalizer, positive gain is applied to part of the audio signal, and negative gain is applied to part of the audio signal, so that the sound effect is better. However, after applying positive gain to the audio signal, the energy of this part of the audio signal is increased, resulting in an increase in the power consumption of the vehicle audio system. Based on this, in the case that the remaining power of the electric vehicle is lower than the preset value, the power consumption of the vehicle audio system can be reduced by reducing the positive gain applied to the audio signal during the debugging process of the equalizer.

[0079] In one example, as shown in Fig. 4(a), in the original equalizer debugging process, the gain applied to the audio signal with a frequency of 63 Hz is 11.3 db, the gain applied to the audio signal with a frequency of 80 Hz is 7.6 db, the gain applied to the audio signal with a frequency of 100 Hz is 10.2 db, the gain applied to the audio signal with a frequency of 125 Hz is 8.8 db, the gain applied to the audio signal with a frequency of 200 Hz is -7.6 db, the gain applied to the audio signal with a frequency of 250 Hz is -6.7 db, the gain applied to the audio signal with a frequency of 315 Hz is -10.5 db, the gain applied to the audio signal with a frequency of 400 Hz is -12.5 db, the gain applied to the audio signal with a frequency of 630 Hz is -5.2 db, the gain applied to the audio signal with a frequency of 800 Hz is -3.2 db, and the gain applied to the audio signal with a frequency of 1000 Hz is 9.6 db. The gain applied to the audio signal with a frequency of 63 Hz, 80 Hz, 100 Hz, 125 Hz and 1000 Hz is positive gain, and the gain applied to the audio signal with a frequency of 200 Hz, 250 Hz, 315 Hz, 400 Hz, 630 Hz and 800 Hz is negative gain. As shown in Fig. 4(b), in the low-power mode of the vehicle-mounted audio system, in the equalizer debugging process, the gain applied to the audio signal with a frequency of 63 Hz, 80 Hz and 100 Hz is adjusted to 0 db, the gain applied to the audio signal with a frequency of 125 Hz is adjusted to 0.1 db, the gain applied to the audio signal with a frequency of 1000 Hz is adjusted to 0.3 db, and the negative gain applied to the audio signal with a frequency of 200 Hz, 250 Hz, 315 Hz, 400 Hz, 630 Hz and 800 Hz remains unchanged. In the equalizer debugging process, positive gain is applied to a part of the frequency bands of the audio signal, and negative gain is applied to another part of the frequency bands of the audio signal. In the low-power mode of the vehicle-mounted audio system, the positive gain applied to a part of the frequency bands of the audio signal in the original equalizer debugging process is reduced, and the negative gain applied to another part of the frequency bands in the original equalizer debugging process remains unchanged. The specific reduction value of the positive gain of each frequency band can be obtained by pre-test, and the specific reduction value of the positive gain of each frequency band is set according to the actual demand by comprehensively considering the energy reduction degree and the distortion degree of the audio signal after the positive gain is reduced.

[0080] When the remaining power of the electric vehicle is lower than the preset value, the normal driving of the electric vehicle is preferentially ensured. At this time, in the equalizer debugging process, all the positive gains can be reduced, the energy of the audio signal can be reduced, the power consumption of the vehicle-mounted audio system can be reduced, and the endurance of the electric vehicle can be improved.

[0081] In one example, after the low-power mode of the vehicle audio system is turned on, the cut-off frequency of the high-pass filter arranged in the subwoofer and woofer is increased, and a negative gain is applied to the low frequency band of the audio signal in the vehicle audio system, the frequency range of the low frequency band of the audio signal being 20 Hz to 250 Hz.

[0082] In one example, after the low-power mode of the vehicle audio system is turned on, the cut-off frequency of the high-pass filter arranged in the subwoofer and woofer is increased, and the positive gain applied to the audio signal in the equalizer debugging process is reduced.

[0083] In one example, after the low-power mode of the vehicle audio system is turned on, the cut-off frequency of the high-pass filter arranged in the subwoofer and woofer is increased, and it is detected whether there is a passenger in the seat corresponding to the speaker contained in the vehicle audio system; if not, the speaker is turned off.

[0084] After the low-power mode of the vehicle audio system is turned on, a plurality of different methods can be used comprehensively to further reduce the power of the audio signal, reduce the power consumption of the vehicle audio system, and improve the endurance of the electric vehicle.

[0085] In one embodiment of the present application, the step S3 comprises:

[0086] If the remaining power of the electric vehicle is lower than the preset value, a prompt is popped up and it is asked whether to turn on the low-power mode.

[0087] A control panel is provided on the electric vehicle, which can be used by the user to control various systems contained in the electric vehicle, such as the vehicle audio system, the air conditioning system, etc. After it is detected that the remaining power of the electric vehicle is lower than the preset value, a prompt message is displayed on the control panel asking the user whether to turn on the low-power mode of the vehicle audio system, and after the user selects to turn on through the control panel, the vehicle audio system operates in the low-power mode; if the user selects not to turn on, the vehicle audio system still operates in the normal mode. The user can choose whether to turn on the low-power mode of the vehicle audio system according to actual needs.

[0088] For example, during the driving of the electric vehicle, when it is detected that the remaining power of the electric vehicle is lower than a preset value, the user is prompted whether to start the low-power mode of the vehicle audio system. If there is a charging station near the electric vehicle at this time, the charging station can charge the electric vehicle, and the electric vehicle can reach the charging station before the power of the electric vehicle is consumed, so the user can choose not to start the low-power mode of the vehicle audio system, and let the vehicle audio system run in the normal mode. If the electric vehicle is far away from the nearest charging station after the electric vehicle displays the prompt whether to start the low-power mode of the vehicle audio system, the electric vehicle cannot reach the nearest charging station before the power of the electric vehicle is consumed, so the user needs to choose to start the low-power mode of the vehicle audio system to reduce the power consumption of the vehicle audio system and ensure that the electric vehicle can reach the nearest charging station before the power of the electric vehicle is consumed.

[0089] The electric vehicle can also ask the user whether to start the low-power mode of the vehicle audio system through voice broadcast. For example, after detecting that the remaining power of the electric vehicle is lower than a preset value, the electric vehicle issues a voice "low remaining power, whether to start the low-power mode", if the user answers "yes", the electric vehicle starts the low-power mode of the vehicle audio system, if the user answers "no", the vehicle audio system still runs in the normal mode.

[0090] The present application asks the user whether to start the low-power mode of the vehicle audio system when the remaining power of the electric vehicle is lower than a preset value, lets the user choose whether to start the low-power mode of the vehicle audio system according to the actual use demand, and ensures the use experience of the user.

[0091] As shown in Figure 5 The control device for the electric vehicle 200 is used to realize the control method of any embodiment of the present application, and the control device comprises:

[0092] The power detection module 201 is used to detect the remaining power of the electric vehicle, and judge whether the remaining power of the electric vehicle is lower than a preset value.

[0093] The vehicle audio system control module 202 is used to start the low-power mode of the vehicle audio system when the remaining power of the electric vehicle is lower than a preset value.

[0094] During the driving of the electric vehicle, the remaining power of the electric vehicle gradually decreases, and the power detection module 201 is used to detect the remaining power of the electric vehicle, if it is detected that the remaining power of the electric vehicle is lower than a preset value, the vehicle audio system control module 202 is used to start the low-power mode of the vehicle audio system. In the low-power mode, the vehicle audio system only retains the necessary functions related to the driving of the electric vehicle, such as calling, navigation, etc.

[0095] The application reduces the power consumption of the vehicle audio system and improves the endurance of the electric vehicle by starting the low-power mode of the vehicle audio system when the residual power of the electric vehicle is lower than a preset value, under the condition of ensuring the basic functions of the vehicle audio system.

[0096] In an embodiment of the application, the vehicle audio system comprises a subwoofer and / or a woofer, and the vehicle audio system control module 202 is further configured to increase the cutoff frequency of a high-pass filter arranged in the subwoofer and / or the woofer after starting the low-power mode of the vehicle audio system.

[0097] Generally, an audio signal comprises low-frequency signals, medium-frequency signals and high-frequency signals, and the spectral energy of most audio signals is mainly concentrated in the low-frequency region. By cutting the low-frequency signal component in the audio signal, the energy of the audio signal can be reduced.

[0098] The application cuts the low-frequency signal component in the audio signal by increasing the cutoff frequency of the high-pass filter arranged in the subwoofer and / or the woofer, reduces the energy of the audio signal, reduces the power consumption of the vehicle audio system, and improves the endurance of the electric vehicle.

[0099] In an embodiment of the application, the vehicle audio system control module 202 is further configured to apply a negative gain to the low-frequency band of the audio signal in the vehicle audio system after starting the low-power mode of the vehicle audio system, and the frequency range of the low-frequency band of the audio signal is 20 Hz to 250 Hz.

[0100] The application can reduce the low-frequency signal component in the audio signal by applying a negative gain to the low-frequency band of the audio signal in the vehicle audio system, thereby reducing the energy of the audio signal, reducing the power consumption of the vehicle audio system, and improving the endurance of the electric vehicle.

[0101] In an embodiment of the application, as shown in Figure 6 The control device 200 of the electric vehicle comprises a seat detection module 203, which is configured to detect whether there is a passenger on the seat corresponding to the loudspeaker included in the vehicle audio system. After starting the low-power mode of the vehicle audio system, the vehicle audio system control module 202 is further configured to turn off the loudspeaker when the seat detection module 203 detects that there is no passenger on the seat corresponding to the loudspeaker included in the vehicle audio system.

[0102] For an electric vehicle with more seats, due to the larger internal space of the electric vehicle, in order to ensure the auditory experience of all passengers, a plurality of loudspeakers are included in the vehicle audio system and are respectively arranged at different positions of the electric vehicle. When there are empty seats on the electric vehicle, there are no passengers on some seats. In this case, if all the loudspeakers in the vehicle audio system are turned on, the electric power will be wasted.

[0103] The application detects whether there is a passenger on the seat of the electric vehicle. If there is no passenger on the seat of the electric vehicle, the loudspeaker corresponding to the seat without the passenger is turned off, unnecessary power consumption is avoided, the power consumption of the vehicle audio system is reduced, and the endurance of the electric vehicle is improved.

[0104] In an embodiment of the application, the vehicle audio system is provided with an equalizer. After the low-power mode of the vehicle audio system is turned on, the vehicle audio system control module 202 is further used to reduce the positive gain applied to the audio signal in the equalizer debugging process.

[0105] The equalizer corrects the sound by adjusting different frequency components contained in the audio signal. The equalizer can adjust the low-frequency signal, the medium-frequency signal and the high-frequency signal contained in the audio signal respectively to improve the sound quality. In the equalizer debugging process, the positive gain is applied to the audio signal to make the sound clearer. However, after the positive gain is applied to the audio signal, the energy of the audio signal is increased, which leads to the increase of the power consumption of the vehicle audio system.

[0106] The application reduces the positive gain applied to the audio signal in the equalizer debugging process, reduces the energy of the audio signal, reduces the power consumption of the vehicle audio system, and improves the endurance of the electric vehicle.

[0107] The embodiment of the application introduces a vehicle audio system. The vehicle audio system has a low-power mode. After the control method described in any embodiment of the application is adopted, the low-power mode of the vehicle audio system can be realized.

[0108] In one example, as shown in Figure 7 The vehicle audio system includes a memory 301 and a processor 302. The memory 301 stores instructions executable by the processor 302. The processor 302 implements the control method of the electric vehicle as described in any embodiment of the application when executing the instructions.

[0109] The embodiment of the application introduces a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed to implement the method as described in any embodiment of the application.

[0110] While certain specific embodiments of the application have been described in detail herein for the purposes of exemplification and to provide a thorough and enabling disclosure, it will be understood that the application is not limited to the particular embodiments described. Any modifications of the methods and materials described herein, which come within the scope and spirit of the application, are to be considered within the scope of the application. The scope of the application is to be determined by the claims appended hereto, which are to be construed in accordance with the principles of patent law.

Claims

1. A control method for an electric vehicle, characterized in that, The electric vehicle is a multi-seat electric bus; the electric vehicle is equipped with an onboard audio system, the onboard audio system has a low-power mode, and the control method includes: Detect the remaining battery power of the electric vehicle; Determine whether the remaining battery power of the electric vehicle is lower than a preset value; If the remaining battery power of the electric vehicle is lower than a preset value, the low-power mode is activated. Enabling the low-power mode includes: increasing the power consumption of the subwoofer. The cutoff frequency of the high-pass filter in the subwoofer; applying a negative gain to the low-frequency band of the audio signal in the vehicle audio system, the low-frequency band of the audio signal having a frequency range of 20 Hz to 250 Hz. Applying negative gain to the low-frequency band of the audio signal in the vehicle audio system includes: obtaining the frequency of the audio signal to which negative gain needs to be applied; obtaining the negative gain to be applied from a preset correspondence between the frequency and negative gain of the audio signal based on the obtained frequency of the audio signal; and applying the negative gain to the audio signal based on the obtained negative gain to be applied; the correspondence between the frequency and negative gain of the audio signal is obtained through pre-testing. Detect whether there is a passenger in the seat corresponding to the speaker included in the vehicle audio system; If not, turn off the speaker.

2. The control method according to claim 1, characterized in that, The in-vehicle audio system includes a subwoofer and / or a bass speaker; Enabling the low-power mode includes: Increase the cutoff frequency of the high-pass filter located in the subwoofer and / or bass speaker.

3. The control method according to claim 2, characterized in that, The step of increasing the cutoff frequency of the high-pass filter disposed in the subwoofer and / or bass speaker includes: When the remaining battery power of the electric vehicle is detected to be less than or equal to a first preset value and greater than a second preset value, the cutoff frequency of the high-pass filter in the subwoofer and / or the bass speaker is increased to the first cutoff frequency; When the remaining battery power of the electric vehicle is detected to be less than or equal to a second preset value, the cutoff frequency of the high-pass filter in the subwoofer and / or the bass speaker is increased to the second cutoff frequency; Wherein, the second preset value is less than the first preset value, and the second cutoff frequency is greater than the first cutoff frequency.

4. The control method according to claim 1, characterized in that, The in-vehicle audio system is equipped with an equalizer; Enabling the low-power mode includes: Reduce the positive gain applied to the audio signal during equalizer tuning.

5. The control method according to claim 1, characterized in that, If the remaining battery power of the electric vehicle is lower than a preset value, the low-power mode is activated, including: If the remaining battery power of the electric vehicle is lower than a preset value, a prompt will appear asking whether to enable the low power mode.

6. A control device for an electric vehicle, characterized in that, The control device is used to implement the control method as described in any one of claims 1 to 5, and the control device includes: A power detection module is used to detect the remaining power of the electric vehicle and determine whether the remaining power of the electric vehicle is lower than a preset value; the electric vehicle is an electric bus with multiple seats. The vehicle audio system control module is used to activate the low-power mode of the vehicle audio system when the remaining battery power of the electric vehicle is lower than a preset value. Specifically, after activating the low-power mode, the vehicle audio system control module is further configured to: increase the cutoff frequency of the high-pass filters configured in the subwoofer and bass speaker; and apply a negative gain to the low-frequency band of the audio signal in the vehicle audio system, wherein the low-frequency band of the audio signal ranges from 20 Hz to 250 Hz. When the vehicle audio system control module applies a negative gain to the low-frequency band of the audio signal in the vehicle audio system, it is specifically used to: obtain the frequency of the audio signal to which a negative gain needs to be applied; obtain the negative gain to be applied from a preset correspondence between the frequency and negative gain of the audio signal based on the obtained frequency of the audio signal; and apply the negative gain to the audio signal based on the obtained negative gain to be applied. The correspondence between the frequency and negative gain of the audio signal is obtained through pre-testing. The control device further includes: A seat detection module is used to detect whether there is a passenger in the seat corresponding to the speaker included in the vehicle audio system.

7. A vehicle-mounted audio system, characterized in that, The in-vehicle audio system has a low-power mode, which can be achieved by using the method described in any one of claims 1-5.

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