CN114727374A

CN114727374A - Control method and device of electric automobile and vehicle-mounted audio system

Info

Publication number: CN114727374A
Application number: CN202210348552.6A
Authority: CN
Inventors: 李志�; 杨健斌
Original assignee: Weifang Geldanna Electronic Technology Co ltd
Current assignee: Weifang Geldanna Electronic Technology Co ltd
Priority date: 2022-04-01
Filing date: 2022-04-01
Publication date: 2022-07-08

Abstract

The invention discloses a control method and a control device of an electric automobile and a vehicle-mounted audio system, wherein the electric automobile 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 electric quantity of the electric automobile; judging whether the residual electric quantity of the electric automobile is lower than a preset value or not; and if the residual electric quantity of the electric automobile is lower than a preset value, starting the low power consumption mode. According to the invention, when the residual electric quantity of the electric automobile is lower than the preset value, the low-power-consumption mode of the vehicle-mounted audio system is started, so that the power consumption of the vehicle-mounted audio system is reduced and the cruising ability of the electric automobile is improved under the condition of ensuring the basic functions of the vehicle-mounted audio system.

Description

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

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a control method and device of an electric automobile and a vehicle-mounted audio system.

Background

In the current design of electric automobiles, the endurance mileage is an important factor. Vehicle speaker systems typically include subwoofer, bass, midrange, and tweeter speakers. For most audio signals, the spectral energy is mainly concentrated in the low frequency region. When the electric quantity of the electric automobile is low, a plurality of low-frequency signal components are still replayed by the vehicle-mounted loudspeaker, and the cruising ability of the electric automobile is reduced.

Disclosure of Invention

One object of the present invention is to provide a new solution for electric vehicles.

According to a first aspect of the present invention, there is provided a control method for an electric vehicle, the electric vehicle being provided with a car audio system, the car audio system having a low power consumption mode, the control method comprising:

detecting the residual electric quantity of the electric automobile;

judging whether the residual electric quantity of the electric automobile is lower than a preset value or not;

and if the residual electric quantity of the electric automobile is lower than a preset value, starting the low power consumption mode.

Optionally, the in-vehicle audio system comprises a subwoofer and/or a woofer;

the turning on the low power consumption mode includes:

the cut-off frequency of a high-pass filter provided in the subwoofer and/or woofer is increased.

Optionally, the increasing the cut-off frequency of a high-pass filter provided in the subwoofer and/or woofer comprises:

when the residual capacity of the electric automobile is detected to be smaller than or equal to a first preset value and larger than a second preset value, increasing the cut-off frequency of a high-pass filter in the subwoofer and/or the woofer to a first cut-off frequency;

when the residual capacity of the electric automobile is detected to be smaller than or equal to a second preset value, increasing the cut-off frequency of a high-pass filter in the subwoofer and/or the woofer to a second cut-off frequency;

wherein the second preset value is smaller than the first preset value, and the second cut-off frequency is greater than the first cut-off frequency.

Optionally, the turning on the low power consumption mode includes:

and applying negative gain to the low frequency band of the audio signal in the vehicle-mounted audio system, wherein the frequency range of the low frequency band of the audio signal is 20 Hz to 250 Hz.

Optionally, the turning on the low power consumption mode includes:

detecting whether a passenger is present in a seat corresponding to a speaker included in the in-vehicle audio system;

if not, the loudspeaker is closed.

Optionally, an equalizer is disposed in the vehicle audio system;

the starting of the low power consumption mode of the vehicle-mounted audio system comprises the following steps:

reducing the positive gain applied to the audio signal during equalizer debugging.

Optionally, if the remaining power of the electric vehicle is lower than a preset value, the low power consumption mode is started, including:

and if the residual electric quantity of the electric automobile is lower than a preset value, popping up a prompt and inquiring whether to start the low power consumption mode.

According to a second aspect of the present invention, there is provided a control device of an electric vehicle for implementing the control method according to the first aspect of the present disclosure, the control device including:

the electric quantity detection module is used for detecting the residual electric quantity of the electric automobile and judging whether the residual electric quantity of the electric automobile is lower than a preset value or not;

and the vehicle-mounted audio system control module is used for starting a low power consumption mode of the vehicle-mounted audio system when the residual electric quantity of the electric automobile is lower than a preset value.

Optionally, the control device further comprises:

a seat detection module to detect whether a passenger is present on a seat corresponding to a speaker included in the in-vehicle audio system.

According to a third aspect of the present invention, there is provided a vehicle audio system having a low power consumption mode, which may be implemented after applying the method according to the first aspect of the present disclosure.

According to one embodiment of the disclosure, the low power consumption mode of the vehicle-mounted audio system is started when the remaining electric quantity of the electric automobile is lower than the preset value, so that the power consumption of the vehicle-mounted audio system is reduced and the cruising ability of the electric automobile is improved under the condition that the basic functions of the vehicle-mounted audio system are ensured.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

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

Fig. 1 is a flowchart of a method for controlling an electric vehicle according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of human voice frequency in one embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating the application of negative gain to the low frequency band of an audio signal according to an embodiment of the present invention.

Fig. 4(a) -4(b) are schematic diagrams illustrating equalizer debugging in an embodiment of the present invention.

Fig. 5 is a functional block diagram of a control device of an electric vehicle according to an embodiment of the present invention.

Fig. 6 is a functional block diagram of a control device for an electric vehicle according to another embodiment of the present invention.

Fig. 7 is a functional block diagram of an in-vehicle audio system in accordance with an embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention 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, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1, an embodiment of the present invention introduces a control method for an electric vehicle, where the electric vehicle is provided with a vehicle-mounted audio system, and the vehicle-mounted audio system has a low power consumption mode, and the control method includes steps S1-S3.

S1: and detecting the residual electric quantity of the electric automobile.

S2: and judging whether the residual electric quantity of the electric automobile is lower than a preset value or not.

S3: and if the residual electric quantity of the electric automobile is lower than a preset value, starting the low power consumption mode.

Generally, a vehicle-mounted audio system is arranged in an electric vehicle, and can provide functions of conversation, navigation, music playing and the like for a user, and the vehicle-mounted audio system is powered by a battery of the electric vehicle when in work. Meanwhile, the battery of the electric automobile also provides energy for the normal running of the electric automobile, and compared with the functions provided by a vehicle-mounted audio system, the battery of the electric automobile ensures that the normal running of the electric automobile is more important, and the battery of the electric automobile preferentially provides energy for the normal running of the electric automobile.

According to the invention, a normal mode and a low power consumption mode are preset in the vehicle-mounted audio system of the electric automobile, and when the residual electric quantity of the electric automobile is higher than the preset value, the vehicle-mounted audio system can operate according to the normal mode. And when the residual electric quantity of the electric automobile is lower than a preset value, the vehicle-mounted audio system operates according to a low power consumption mode in order to preferentially ensure the normal driving of the electric automobile. For example, in the low power mode, the car audio system may retain only necessary functions related to normal driving of the electric car, such as talking, navigation, and the like.

The user can set the preset value according to actual requirements. For example, the electric vehicle mainly travels for a long distance, and the electric vehicle can charge the battery after traveling for a long distance, and in this case, the user can increase the preset value, so as to prevent the electric vehicle from depleting the electric quantity of the battery of the electric vehicle before traveling to a place where the electric vehicle can be charged. For another example, the electric vehicle mainly travels in a short distance, and a place where the battery of the electric vehicle can be charged can be frequently encountered in the traveling process of the electric vehicle, under the circumstance, a user does not need to worry that the place where the battery of the electric vehicle can be charged cannot be reached before the electric quantity of the electric vehicle is exhausted, the user can adjust the preset value, normal operation of all functions of the vehicle-mounted audio system is guaranteed, and use experience of the user is improved.

According to the invention, when the residual electric quantity of the electric automobile is lower than the preset value, the low-power-consumption mode of the vehicle-mounted audio system is started, so that the power consumption of the vehicle-mounted audio system is reduced and the cruising ability of the electric automobile is improved under the condition of ensuring the basic functions of the vehicle-mounted audio system.

In one embodiment of the present invention, the car audio system includes a subwoofer and/or a woofer, and the step S3 includes: the cut-off frequency of a high-pass filter provided in the subwoofer and/or woofer is increased.

Both subwoofer and woofer are provided with high pass filters through which audio signals can pass only if their frequency is higher than their cut-off frequency, otherwise they are intercepted by the high pass filters. Whereas the cut-off frequencies of the high pass filters of the subwoofer and the woofer are low, e.g. only 20 hz. Generally, the audio signal includes a low frequency signal, a middle frequency signal and a high frequency signal, and for most audio signals, the spectral energy is mainly concentrated in the low frequency region. By reducing low-frequency signal components in the audio signal, the energy of the audio signal can be reduced.

In one example, a subwoofer is provided in a vehicle audio system, and a cutoff frequency of a high pass filter provided in the subwoofer is increased after a low power mode of the vehicle audio system is turned on.

In one example, a woofer is provided in a vehicle audio system, and a cutoff frequency of a high pass filter provided in the woofer is increased after a low power mode of the vehicle audio system is turned on.

In one example, a subwoofer and a woofer are provided in a vehicle audio system, and a cutoff frequency of a high pass filter provided in the subwoofer and the woofer is increased after a low power mode of the vehicle audio system is turned on. The cut-off frequency of the high-pass filters in the subwoofer and the woofer is increased from 20 Hz to 250 Hz, and low-frequency signal components with the frequency lower than 250 Hz in the audio signal are all intercepted by the high-pass filters, so that the energy of the audio signal is reduced. The cut-off frequency of the high-pass filter can be adjusted according to actual conditions, and is not limited herein.

In one embodiment of the invention, when the remaining capacity of the electric automobile is detected to be smaller than or equal to a first preset value and larger than a second preset value, the cut-off frequency of the subwoofer and/or a high-pass filter in the subwoofer is increased to a first cut-off frequency.

And when the residual capacity of the electric automobile is detected to be less than or equal to a second preset value, increasing the cut-off frequency of the high-pass filter in the subwoofer and/or the woofer to a second cut-off frequency.

As shown in fig. 2, the abscissa represents the frequency of the sound signal, and the frequency ranges of several different human voice signals are shown, such as the frequency ranges of female treble, female bass, midrange, bass, and it can be seen that the audio signal frequency of the human voice is mainly below 1000 hz. In the present embodiment, the first cutoff frequency and the second cutoff frequency are preset for the cutoff frequencies of the subwoofer and the high-pass filter in the woofer, and the first preset value and the second preset value are preset for the remaining capacity of the electric vehicle. When the remaining capacity of the electric vehicle is 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 the woofer is set to be a first cutoff frequency, and when the remaining capacity of the electric vehicle is less than or equal to the second preset value, the cutoff frequency of the high-pass filter in the subwoofer and the woofer is set to be a second cutoff frequency, wherein the first preset value is greater than the second preset value, and the first cutoff frequency is less than the second cutoff frequency. The first cutoff frequency and the second cutoff frequency are derived by preliminary testing.

For example, the first cut-off frequency is 200 hz, the second cut-off frequency is 315 hz, the first preset value is 50% of the total electric quantity of the electric vehicle, and the second preset value is 20% of the total electric quantity of the electric vehicle. When the residual electric quantity of the electric automobile is lower than 50%, the low power consumption mode of the vehicle-mounted audio system is started, the residual electric quantity of the electric automobile is relatively large, the human voice signal distortion can be avoided in a priority mode, the cut-off frequency of the high-pass filter is set to be 200 Hz, the fact that most of human voice fundamental frequencies are not lost can be guaranteed, and meanwhile the energy of the audio signals is reduced. And when the residual capacity of the electric automobile is lower than 20%, the residual capacity of the electric automobile is relatively small, the endurance problem of the electric automobile needs to be considered preferentially, the cut-off frequency of the high-pass filter is further improved, the cut-off frequency of the high-pass filter is set to be 315 Hz, the high-pass filter filters more low-frequency signals, relatively large distortion can be caused to human voice signals, and meanwhile the energy of audio signals can be further reduced.

The vehicle audio system also comprises a middle loudspeaker and a high pitch loudspeaker, and a subwoofer, a bass loudspeaker, a middle loudspeaker and a high pitch loudspeaker are mixed for use. When the vehicle-mounted audio system plays navigation information, for example, the vehicle-mounted audio system plays a signal of traffic light at the position 300 meters ahead, after the cut-off frequency of a high-pass filter in the subwoofer and the woofer is increased, the audio signal only contains a medium-frequency signal and a high-frequency signal with the frequency of more than 250 Hz, the medium-frequency speaker and the tweeter play normally, the content heard by a user is still the signal of traffic light at the position 300 meters ahead, the content heard by the user is kept unchanged, but the low-frequency signals output by the subwoofer and the woofer are reduced.

According to the invention, by improving the cut-off frequency of the high-pass filters arranged in the subwoofer and the woofer, the low-frequency signal components contained in the audio signal are reduced, the energy of the audio signal is reduced, the power consumption of a vehicle-mounted audio system is reduced, and the cruising ability of the electric automobile is improved.

In one embodiment of the present invention, the step S3 includes: and applying negative gain to the low frequency band of the audio signal in the vehicle-mounted audio system, wherein the frequency range of the low frequency band of the audio signal is 20 Hz to 250 Hz.

Since the spectral energy of an audio signal is mainly concentrated in the low frequency region, the energy of the audio signal can be reduced by cutting down low frequency signal components in the audio signal. In the present embodiment, the reduction of the low-frequency signal component in the audio signal is realized by applying a negative gain to the 20 hz to 250 hz frequency band in the audio signal.

The numerical value of the negative gain to be applied can be obtained according to the pre-test, so that the sound is not distorted after the negative gain is applied, and the user can still clearly hear the content played by the vehicle-mounted audio system. In one example, when the car audio system plays navigation information, for example, the car audio system plays "turn right at the front traffic light intersection", after applying negative gain to the low frequency band of the audio signal, the low frequency signal component in the audio signal is reduced, because the applied negative gain is obtained through a pre-test, the sound is not distorted after applying the negative gain, the content played by the car audio system is still "turn right at the front traffic light intersection", and the content heard by the user remains unchanged.

In one embodiment of the present invention, applying a negative gain to a low frequency band of an audio signal in the car audio system includes: acquiring the frequency of an audio signal needing to be applied with negative gain, acquiring the negative gain needing to be applied from the corresponding relation between the frequency of a preset audio signal and the negative gain according to the acquired frequency of the audio signal, and applying the negative gain to the audio signal according to the acquired negative gain needing to be applied.

As shown in fig. 3, in one example, the corresponding relationship between the frequency of the audio signal and the negative gain is preset, and when the negative gain is applied to the low frequency band of the audio signal in the car audio system, different negative gains may be applied to different frequency bands of the audio signal. When the negative gain is applied, the negative gain to be applied is obtained from the pre-stored corresponding relation according to the frequency of the audio signal, and the corresponding relation between the frequency of the audio signal and the negative gain is obtained through pre-testing. For example, for a signal having a frequency of 40 Hz, a gain of-13.4 db is applied; for a signal with a frequency of 50 Hz, a gain of-11.6 db is applied; for a signal with a frequency of 63 Hz, a gain of-3.5 db is applied; for a signal with a frequency of 80 hertz, applying a gain of-10.5 db; for a signal with a frequency of 100 hertz, a gain of-6.4 db is applied; for a signal with a frequency of 125 Hz, a gain of-3.5 db is applied; for a signal having a frequency of 160 Hz, a gain of-7 db is applied. The audio signal comprises a plurality of frequency bands, the energy of different audio signals in the same frequency band is different, and the energy of the audio signal can be reduced more under the condition of avoiding the distortion of the audio signal as much as possible by applying different negative gains to different frequency bands in the audio signal.

According to the invention, by applying negative gain to the low-frequency section of the audio signal, the low-frequency signal component contained in the audio signal is reduced, the energy of the audio signal is reduced, the power consumption of the vehicle-mounted audio system is further reduced, and the cruising ability of the electric automobile is improved.

In one embodiment of the present invention, the step S3 includes: detecting whether a passenger is present in a seat near each speaker included in the in-vehicle audio system; if not, the loudspeaker is closed.

For a common electric private car, the number of passengers is small, the internal space is small, and the vehicle-mounted audio system can meet the use requirement of a user only by one loudspeaker. For an electric vehicle with more seats, such as an electric bus, the interior space of the electric bus is larger, and if the number of speakers included in the car audio system is small, the hearing experience of the passengers is affected. In order to ensure the hearing experience of all passengers, a plurality of loudspeakers are contained in the vehicle-mounted audio system and are respectively arranged at different positions of the electric bus, and the number of the loudspeakers is increased along with the increase of the number of seats of the electric bus.

In one example, for a motor bus with 10 rows of seats, a speaker is provided above each row of seats. Since there may be empty seats in the electric bus during actual use, and there are no passengers in some seats, for example, there are no passengers in the last three rows of seats of the electric bus, if the speakers corresponding to the last three rows of seats of the electric bus are still turned on in this situation, the waste of electric power is caused, and the speakers corresponding to the last three rows of seats may be turned off at this time, so as to reduce the consumption of electric power.

In one example, for a motor bus with 10 rows of seats, there is one speaker for each row of seats, for a total of five speakers. For example, the first and second rows of seats correspond to a first speaker, the third and fourth rows of seats correspond to a second speaker, the fifth and sixth rows of seats correspond to a third speaker, the seventh and eighth rows of seats correspond to a fourth speaker, and the ninth and tenth rows of seats correspond to a fifth speaker. If a passenger is detected in the first row of seats, the first speaker is turned on regardless of whether a passenger is present in the second row of seats. And if no passenger is detected in both the third and fourth rows of seats, the second speaker is turned off.

According to the invention, whether passengers exist on the seat of the electric automobile is detected, and if no passenger exists on the seat of the electric automobile, the loudspeaker corresponding to the seat without the passenger is closed, so that unnecessary electric quantity consumption is avoided, the power consumption of a vehicle-mounted audio system is reduced, and the cruising ability of the electric automobile is improved.

In one embodiment of the present invention, an equalizer is provided in the car audio system, and the step S3 includes: reducing the positive gain applied to the audio signal during equalizer debugging.

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

In one example, as shown in fig. 4(a), in the original equalizer debugging process, 11.3db of gain needs to be applied to an audio signal with a frequency of 63 hz, 7.6db of gain needs to be applied to an audio signal with a frequency of 80 hz, 10.2db of gain needs to be applied to an audio signal with a frequency of 100 hz, 8.8db of gain needs to be applied to an audio signal with a frequency of 125 hz, 7.6db of gain needs to be applied to an audio signal with a frequency of 200 hz, 6.7db of gain needs to be applied to an audio signal with a frequency of 250 hz, 10.5db of gain needs to be applied to an audio signal with a frequency of 315 hz, 12.5db of gain needs to be applied to an audio signal with a frequency of 400 hz, 5.2db of gain needs to be applied to an audio signal with a frequency of 630 hz, 3.2db of gain needs to be applied to an audio signal with a frequency of 800 hz, the gain required to be applied to an audio signal having a frequency of 1000 hz is 9.6 db. The gain applied to the audio signals with frequencies of 63 hz, 80 hz, 100 hz, 125 hz and 1000 hz is positive gain, and the gain applied to the audio signals with frequencies 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 consumption mode of the car audio system, the gains applied to the audio signals having frequencies of 63 hz, 80 hz, and 100 hz during the equalizer debugging are all adjusted to 0db, the gain applied to the audio signal having frequency of 125 hz is adjusted to 0.1db, the gain applied to the audio signal having frequency of 1000 hz is adjusted to 0.3db, and the negative gains applied to the audio signals having frequencies of 200 hz, 250 hz, 315 hz, 400 hz, 630 hz, and 800 hz are maintained. During the debugging process of the equalizer, positive gain is applied to the audio signals of one part of the frequency band, and negative gain is applied to the audio signals of the other part of the frequency band. In a low power consumption mode of the vehicle-mounted audio system, positive gain applied to audio signals of one part of frequency bands in the debugging process of the original equalizer is reduced, and negative gain applied to the other part of frequency bands in the debugging process of the original equalizer is kept unchanged. The specific positive gain reduction value of each frequency band can be obtained through a pre-test, the energy reduction degree of the audio signal after the positive gain is reduced and the distortion degree of the audio signal are comprehensively considered, and the specific positive gain reduction value of each frequency band is set according to actual requirements.

When the residual electric quantity of the electric automobile is lower than a preset value, the normal running of the electric automobile needs to be guaranteed preferentially. At the moment, all positive gains can be reduced, the energy of audio signals is reduced, the power consumption of a vehicle-mounted audio system is reduced, and the cruising ability of the electric automobile is improved in the debugging process of the equalizer.

In one example, after a low power mode of the car audio system is turned on, a cutoff frequency of high pass filters provided in the subwoofer and the woofer is increased, and a negative gain is applied to a low frequency band of an audio signal in the car audio system, the low frequency band of the audio signal having a frequency range of 20 hz to 250 hz.

In one example, after a low power mode of the in-vehicle audio system is turned on, the cutoff frequencies of high pass filters provided in the subwoofer and the woofer are increased, and the positive gain applied to the audio signal during the equalizer debugging is reduced.

In one example, after a low power mode of a car audio system is turned on, a cutoff frequency of a high pass filter provided in a subwoofer and a woofer is increased, and whether a passenger is present on a seat corresponding to a speaker included in the car audio system is detected; if not, the loudspeaker is closed.

After the low power consumption mode of the vehicle-mounted audio system is started, various different modes can be comprehensively used, the capacity of audio signals is further reduced, the power consumption of the vehicle-mounted audio system is reduced, and the cruising ability of the electric automobile is improved.

In one embodiment of the present invention, the step S3 includes:

The control panel is arranged on the electric automobile, so that a user can control various systems contained in the electric automobile, such as a vehicle-mounted audio system, an air conditioning system and the like. After detecting that the residual electric quantity of the electric automobile is lower than a preset value, displaying a prompt message for inquiring whether a user needs to start a low-power-consumption mode of the vehicle-mounted audio system on the control panel, and after the user selects to start the low-power-consumption mode through the control panel, enabling the vehicle-mounted audio system to run in the low-power-consumption mode; and if the user chooses not to turn on, the in-vehicle audio system is still operating in the normal mode. The user can select whether to start the low power consumption mode of the vehicle-mounted audio system according to actual requirements.

For example, during the driving process of the electric automobile, after the residual electric quantity of the electric automobile is detected to be lower than a preset value, a user is prompted whether to start a low power consumption mode of the vehicle-mounted audio system. If a charging station exists near the electric vehicle, the charging station can charge the electric vehicle, and the electric vehicle can arrive at the charging station before the electric quantity of the electric vehicle is exhausted, the user can select a low power consumption mode without starting the vehicle-mounted audio system, and the vehicle-mounted audio system can operate in a normal mode. If the electric vehicle is far away from the nearest charging station after the electric vehicle displays the low power consumption mode prompting the user whether to start the vehicle-mounted audio system or not, the electric vehicle cannot reach the nearest charging station before the electric quantity of the electric vehicle is exhausted, and at the moment, the user needs to select to start the low power consumption mode of the vehicle-mounted audio system, so that the power consumption of the vehicle-mounted audio system is reduced, and the electric vehicle can reach the nearest charging station before the electric quantity of the electric vehicle is exhausted.

The electric automobile can also inquire whether a user starts a low power consumption mode of the vehicle-mounted audio system or not in a voice broadcast mode. For example, after detecting that the remaining power of the electric vehicle is lower than a preset value, the electric vehicle sends out a voice of 'the remaining power is low, whether to start a low power consumption mode', and if the user answers 'yes', the electric vehicle starts the low power consumption mode of the vehicle-mounted audio system; if the user answers "no", the car audio system is still operating in the normal mode.

According to the method and the device, when the residual electric quantity of the electric automobile is lower than the preset value, the user is inquired whether to start the low power consumption mode of the vehicle-mounted audio system, so that the user can select whether to start the low power consumption mode of the vehicle-mounted audio system according to actual use requirements, and the use experience of the user is guaranteed.

As shown in fig. 5, an embodiment of the present invention provides a control device 200 for an electric vehicle, the control device being configured to implement the control method according to any one of the embodiments of the present invention, the control device including:

the electric quantity detection module 201 is configured to detect the remaining electric quantity of the electric vehicle, and determine whether the remaining electric quantity of the electric vehicle is lower than a preset value.

And the vehicle-mounted audio system control module 202 is configured to start a low power consumption mode of the vehicle-mounted audio system when the remaining power of the electric vehicle is lower than a preset value.

During the driving process of the electric automobile, the remaining capacity of the electric automobile is gradually reduced, the remaining capacity of the electric automobile is detected by the capacity detection module 201, and if the remaining capacity of the electric automobile is detected to be lower than a preset value, the low power consumption mode of the vehicle-mounted audio system is started by the vehicle-mounted audio system control module 202. In the low power consumption mode, the vehicle-mounted audio system only retains necessary functions related to the running of the electric vehicle, such as conversation, navigation and the like.

In one embodiment of the present invention, the in-vehicle audio system includes a subwoofer and/or a woofer, and the in-vehicle audio system control module 202 is further configured to increase a cutoff frequency of a high pass filter provided in the subwoofer and the woofer after a low power consumption mode of the in-vehicle audio system is turned on.

Generally, the audio signal includes a low frequency signal, a middle frequency signal and a high frequency signal, and for most audio signals, the spectral energy is mainly concentrated in the low frequency region. By reducing low-frequency signal components in the audio signal, the energy of the audio signal can be reduced.

In an embodiment of the present invention, after the low power consumption mode of the car audio system is turned on, the car audio system control module 202 is further configured to apply a negative gain to a low frequency band of an audio signal in the car audio system, where the low frequency band of the audio signal has a frequency range of 20 hz to 250 hz.

According to the invention, by applying the negative gain to the low-frequency section of the audio signal in the vehicle-mounted audio system, the low-frequency signal component contained in the audio signal can be reduced, so that the energy of the audio signal is reduced, the power consumption of the vehicle-mounted audio system is reduced, and the cruising ability of the electric vehicle is improved.

In one embodiment of the present invention, as shown in fig. 6, the control device 200 of the electric vehicle includes a seat detection module 203, and the seat detection module 203 is configured to detect whether a passenger is present in a seat corresponding to a speaker included in the car audio system. After the low power mode of the car audio system is turned on, the car audio system control module 202 is further configured to turn off the speakers when the seat detection module 203 detects that no passenger is present in the seat corresponding to the speakers included in the car audio system.

For the electric automobile that has more seats, because electric automobile's inner space is great, in order to guarantee all passengers ' sense of hearing and experience, contain a plurality of speakers in on-vehicle audio system, set up respectively in electric automobile's different positions. When the electric automobile may have empty seats, passengers are not in some of the seats. In this case, if all the speakers in the car audio system are turned on, a waste of power is caused.

In an embodiment of the present invention, an equalizer is disposed in the car audio system, and after the low power consumption mode of the car audio system is turned on, the car audio system control module 202 is further configured to reduce a positive gain applied to the audio signal during debugging of the equalizer.

The equalizer corrects the sound by adjusting different frequency components included in the audio signal, and the equalizer can adjust a low frequency signal, an intermediate frequency signal, and a high frequency signal included in the audio signal, respectively, to improve the sound quality. During the equalizer debugging process, positive gain is applied to the audio signal to make the sound clearer. However, after applying a positive gain to the audio signal, the energy of the audio signal is increased, resulting in an increase in power consumption of the car audio system.

The invention reduces the energy of the audio signal, reduces the power consumption of the vehicle-mounted audio system and improves the cruising ability of the electric automobile by reducing the positive gain applied to the audio signal in the debugging process of the equalizer.

The embodiment of the invention introduces a vehicle-mounted audio system, wherein the vehicle-mounted audio system has a low power consumption mode, and the low power consumption mode of the vehicle-mounted audio system can be realized after the control method according to any embodiment of the invention is adopted.

In one example, as shown in fig. 7, the car audio system includes a memory 301 and a processor 302, the memory 301 stores instructions executable by the processor 302, and the processor 302 implements the control method of the electric car according to any embodiment of the present invention when executing the instructions.

Embodiments of the present invention introduce a computer-readable storage medium on which a computer program is stored, which when executed performs a method according to any of the embodiments of the present invention.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A control method of an electric automobile is characterized in that a vehicle-mounted audio system is arranged on the electric automobile, the vehicle-mounted audio system has a low power consumption mode, and the control method comprises the following steps:

detecting the residual electric quantity of the electric automobile;

2. The control method according to claim 1, characterized in that the in-vehicle audio system comprises a subwoofer and/or a woofer;

the turning on the low power consumption mode includes:

3. A control method according to claim 2, characterized in that said increasing the cut-off frequency of a high-pass filter provided in the subwoofer and/or woofer comprises:

4. The control method of claim 1, wherein the turning on the low power consumption mode comprises:

5. The control method of claim 1, wherein the turning on the low power consumption mode comprises:

if not, the loudspeaker is closed.

6. The control method according to claim 1, wherein an equalizer is provided in the car audio system;

the turning on the low power consumption mode includes:

7. The control method according to claim 1, wherein if the remaining capacity of the electric vehicle is lower than a preset value, the starting of the low power consumption mode comprises:

8. A control device of an electric vehicle, characterized in that the control device is configured to implement the control method according to any one of claims 1 to 7, the control device comprising:

9. The control device according to claim 8, characterized by further comprising:

10. A vehicle audio system, characterized in that the vehicle audio system has a low power mode, which can be implemented after applying the method according to any of claims 1-7.