CN109703455A - A kind of electric car of environment self-adaption runs at a low speed warning system and method - Google Patents
A kind of electric car of environment self-adaption runs at a low speed warning system and method Download PDFInfo
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Abstract
The electric car that the present invention provides a kind of environment self-adaption runs at a low speed warning system and method, is made of speed signal acquisition unit, gear signal acquisition unit, ambient noise acquisition unit, calculating and processing unit and loudspeaker module；The basic noise signal for synthesizing simulated engine operating according to speed signal and gear signal with processing unit is calculated, influence amendment, the operating sound signal of synthesis simulation conventional engines are carried out to basic noise signal according to running environment noise signal；Loudspeaker module makes a sound according to the operating sound signal of synthesis simulation conventional engines and carries out safety prompt function to road pedestrian near vehicle.The present invention passes through the acquisition to running environment noise, and the alarm sound for running at a low speed warning system is modified, it avoids the occurrence of biggish alarm sound under quiet environment and causes pollution from environmental noise, and the alert unconspicuous problem of suggesting effect of volume tabloid of alarming under noisy environment.
Description
Technical field
The invention belongs to electric vehicle engineering fields, and in particular to a kind of electric car of environment self-adaption runs at a low speed police
Show system and method.
Background technique
New energy pure electric automobile or hybrid vehicle are driven in vehicle start or when running at a low speed using pure power mode
Dynamic motor operation, so that vehicle body be pushed to advance.When being run at a low speed due to electric car, the noise sound of generation is small, road row
People may be without noticing of electric car of the traveling behind it, so that causing vehicle wipes the traffic accident for touching pedestrian.
Standard GB/T 7258-2017 be distinctly claimed " pure electric automobile, plug-in hybrid-power automobile in vehicle start and
When speed is lower than 20km/h, the indicative sound appropriate should be able to be issued to the outer personnel of vehicle ".
Electric car runs at a low speed the sound that warning system control alarming horn issues simulation conventional fuel oil machine, according to vehicle
Gear and speed signal carry out the control of alarm sound size, safety instruction are carried out to road pedestrian near vehicle, to avoid electricity
Due to low noise bring security risk when electrical automobile is run at a low speed.Existing electric car runs at a low speed warning system
The alarm volume that loudspeaker issue is adjusted according to speed and gear, intelligence can not be carried out according to actual environment around
It can control, so that biggish alarm sound causes pollution from environmental noise under quiet running environment, and alarm under noisy running environment
Volume it is small and to other roads be user suggesting effect it is unobvious.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of electric cars of environment self-adaption to run at a low speed warning system
System and method, run at a low speed warning system according only to automobile gear level and vehicle speed information adjustment sound for solving existing electric car
Sound, running environment cannot be adapted to automatically and caused by pollution from environmental noise or the unconspicuous problem of suggesting effect.
The present invention adopts the following technical scheme:
A kind of electric car of environment self-adaption runs at a low speed warning system, by speed signal acquisition unit, ambient noise
Acquisition unit, calculating and processing unit and loudspeaker module composition；
Speed signal acquisition unit, for acquiring the speed signal of automobilism；
Gear signal acquisition unit, for acquiring the gear signal of automobilism；
Ambient noise acquisition unit, for acquiring running car ambient noise signal；
Calculating and processing unit, for receiving and handling speed signal acquisition unit, gear signal acquisition unit and environment
Speed signal, gear signal and the running environment noise signal that Noise Acquisition unit is sent, according to speed signal and gear signal
The basic noise signal for synthesizing simulated engine operating carries out influencing to repair according to running environment noise signal on basic noise signal
Just, the operating sound signal of synthesis simulation conventional engines；
Loudspeaker module makes a sound according to the operating sound signal of synthesis simulation conventional engines to road near vehicle
Road pedestrian carries out safety prompt function.
Preferably, the calculating and processing unit include data acquisition module, analog-to-digital conversion module, processor module, number
Mould conversion module and power amplifier module；
Data acquisition module, the vehicle sent for receiving and handling speed signal acquisition unit and gear signal acquisition unit
Speed and gear signal, and it is sent to processor module；
Analog-to-digital conversion module, the ambient noise analog signal for sending ambient noise acquisition unit are converted into digital letter
Number, and it is sent to processor module；
Processor module, according to the electric car speed of acquisition, gear and running environment noise signal, synthesis simulation tradition
The operating sound signal of engine, and it is sent to D/A converter module；
D/A converter module for conventional engines operating sound digital signal to be converted into analog signal, and is sent to
Power amplifier module；
Power discharge module, the analog signal that will convert into are sent to loudspeaker module after power amplification.
Preferably, speed signal acquisition unit and gear signal acquisition unit using CAN bus acquisition vehicle speed and
Gear information.
Preferably, speed signal acquisition unit and gear signal acquisition unit using vehicle speed sensor and gear position sensor into
Row signal acquisition.
Preferably, ambient noise acquisition unit is by microphone behind microphone, left back microphone and the right side before left front microphone, the right side
It forms, microphone is separately mounted to the outer of electric car crew module behind microphone, left back microphone and the right side before left front microphone, the right side
The front left, front right, rear left and right position in portion, for acquiring running environment noise information.
The invention also discloses a kind of electric cars of environment self-adaption to run at a low speed alarming method for power, includes the following steps:
S1, automobilism information is obtained, the operation information includes at least vehicle speed information, starts according to speed synthesis simulation
The sound pressure level B of the basic noise signal of machine operating, using following formula:
B=65 × V, 0≤V≤1 (1)
V≤20 B=(10 × V+1225)/19,1 < (2)
Wherein, V is speed, unit km/h.
S2, running environment noise information is obtained, shadow is carried out by sound pressure level B of the running environment noise to basic noise signal
Amendment is rung, impact factor λ uses following formula:
λ=1,0≤VA < 30 (3)
λ=λmax,105≤VA (5)
Wherein, VA is running environment noise, unit db；λmaxIt is acceptable most with road pedestrian for parameter to be calibrated
Big alarm volume is related.
S3, according to the sound pressure level λ of the operating sound for influencing modified basic noise signal synthesis simulation conventional engines ×
B is made a sound by loudspeaker module and carries out safety prompt function to road pedestrian near vehicle；
Wherein, λ is the impact factor in step S2, and B is the sound pressure level of the basic noise signal in step S1, λmax× B is
The acceptable maximum alarm volume of road pedestrian.
Preferably, in step S1, the operation information includes vehicle speed information and gear information, puts into gear in vehicle and starts to walk and fall
During vehicle, the basic noise signal of simulated engine operating is also synthesized according to speed.
Preferably, in step S1, when speed is greater than 20km/h, the sound pressure level B of basic noise signal is 0, and warning system is stopped
Only sounding.
Preferably, in step S1, the basic noise signal of the simulated engine operating is recorded by former vehicle to be generated, and is increased
2KHz~5KHz frequency range acoustic pressure improves pedestrian to the perception of caution sound, while reducing 1KHz frequency range acoustic pressure nearby, reduces environment
Noise acts on the covering of caution sound.
Beneficial effects of the present invention: the present invention is by the acquisition to running environment noise, and to running at a low speed warning system
Alarm sound be modified, enable and run at a low speed warning system and adapt to running environment automatically, avoid the occurrence of quiet environment
Under biggish alarm sound cause pollution from environmental noise, and volume tabloid of alarming under noisy environment is alert that suggesting effect is unconspicuous asks
Topic.
Detailed description of the invention
Attached drawing is used to provide to preferred understanding of the invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is to run at a low speed warning system composition figure in the present invention；
Fig. 2 is environment Noise Acquisition unit composition figure in the present invention；
Fig. 3 is sound pressure level and speed graph of relation in the present invention；
Fig. 4 is impact factor and ambient noise graph of relation in the present invention.
Specific embodiment
A specific embodiment of the invention is described with reference to the accompanying drawing.
As shown in Figure 1, run at a low speed warning system for the electric car of environment self-adaption of the invention a kind of, the system by
Speed signal acquisition unit 1, ambient noise acquisition unit 3, calculates and processing unit 4 and loudspeaker gear signal acquisition unit 2
Module 5 forms.
Speed signal acquisition unit 1, gear signal acquisition unit 2 and ambient noise acquisition unit 3 respectively with calculate and place
The input terminal for managing unit 4 is connected, and calculating is connected with the output end of processing unit 4 with the input terminal of loudspeaker module 5；
Calculating with processing unit 4 includes data acquisition module 401, analog-to-digital conversion module 402, processor module 403, digital-to-analogue
Conversion module 404, power amplifier module 405；
The vehicle that data acquisition module 401 receives and processing speed signal acquisition unit 1 and gear signal acquisition unit 2 are sent
Speed and gear signal, and it is sent to processor module 403；Speed signal acquisition unit 1 and gear signal acquisition unit 2 are preferably adopted
With the speed and gear information of CAN bus acquisition vehicle, vehicle speed sensor and gear position sensor can also be used and adopted to carry out signal
Collection；
The ambient noise analog signal that ambient noise acquisition unit 3 is sent is converted into digital letter by analog-to-digital conversion module 402
Number it is sent to processor module 403；
Processor module 403 is according to the electric car speed of acquisition, gear and running environment noise signal, in vehicle start
During running at a low speed, the operating sound signal of synthesis simulation conventional engines is sent to D/A converter module 404, by digital-to-analogue
Conventional engines operating sound digital signal is converted into analog signal and is sent to power amplifier module 405 by conversion module 404, warp
The driving and power amplification of overpower discharge module 405 are sent to loudspeaker module 5, are made a sound by loudspeaker module 5 to vehicle
Road pedestrian carries out safety prompt function near.
As shown in Fig. 2, the ambient noise acquisition unit 3 of warning system is mainly used for acquiring vehicle running environment noise, by
Microphone 304 forms behind microphone 302, left back microphone 303 and the right side before left front microphone 301, the right side, and four microphones are pacified respectively
Mounted in the front left, front right, rear left and right position of the outside of electric car crew module, for acquiring running environment noise information；
The running environment noise sound wave of acquisition is converted into noise signal transmission to analog-to-digital conversion module 402, analog-to-digital conversion mould by microphone
The noise signal that block 402 acquires microphone carries out analog-to-digital conversion, and by the running environment noise signal transmission after analog-to-digital conversion
To processor module 403.
Processor module 403 synthesizes mould according to the speed of acquisition, gear and running environment noise information by the following method
The operating sound signal of quasi- conventional engines is simultaneously sent to loudspeaker module 5:
(1) it puts into gear in starting and reversing process in vehicle, is believed according to the basic noise that speed synthesizes simulated engine operating
Number, the sound pressure level B of basic noise signal and the relation curve of vehicle velocity V are shown in Fig. 3, are mainly made of two sections of curves of I and II.
I sections: B=65 × V, 0≤V≤1 (6)
V≤20 (10 × V+1225)/19,1 < (7) II sections: B=
As it can be seen that the relationship of the sound pressure level B and Vehicle Speed V of basic noise signal are as follows:
1) when speed is 0, sound pressure level B is 0, runs at a low speed warning system not sounding；
2) speed from 0 rise to 1km/h when, the sound pressure level B for running at a low speed warning system is climbed to 65db；
3) it when speed changes between 1km/h and 20km/h, runs at a low speed between the sound pressure level B of warning system and vehicle velocity V
In a linear relationship, vehicle velocity V is bigger, and sound pressure level B is bigger；
4) it when speed is greater than 20km/h, runs at a low speed warning system and stops sounding.
As further scheme, the basic noise signal of simulated engine operating is recorded by former vehicle to be generated, additional to increase
2KHz~5KHz frequency range acoustic pressure improves pedestrian to the perception of caution sound, while reducing 1KHz frequency range acoustic pressure nearby, reduces environment
Noise acts on the covering of caution sound.
(2) cause pollution from environmental noise in order to avoid there is biggish alarm sound under quiet running environment, and noisy row
It sails and alarms that volume is small and to other roads be the unconspicuous problem of suggesting effect of user, and the present invention is made an uproar using environment under environment
Sound acquisition unit 3 is acquired running environment noise, is carried out by sound pressure level B of the running environment noise to basic noise signal
Amendment is influenced, the relationship for obtaining the sound pressure level λ × B for being sent to loudspeaker module 5, impact factor λ and running environment noise VA is bent
Line is shown in Fig. 4, mainly by 1., 2., 3. three sections of curves form.
1. section: λ=1,0≤VA < 30 (8)
2. section:
3. section: λ=λmax,105≤VA (10)
Wherein, λmaxIt is specifically related with the acceptable maximum alarm volume of road pedestrian, it is to run at a low speed warning system to wait for
Calibrating parameters.
When vehicle velocity V is 20km/h, the sound pressure level B of basic noise signal reaches maximum value 75db, and people is acceptable most
Big alarm volume is generally in 90db or so, therefore, in the present embodiment, λmaxValue is 1.2, from fig. 4, it can be seen that impact factor λ with
The relationship of running environment noise VA are as follows:
1) for running environment noise VA within 30db, impact factor λ value is 1, is sent to the sound pressure level of loudspeaker module 5
λ × B is equal to the sound pressure level B of basic noise signal；
2) running environment noise VA is in line between impact factor λ and running environment noise VA when 30db is between 105db
Sexual intercourse, running environment noise VA is bigger, and the value of impact factor λ is bigger, and the sound pressure level λ × B for being sent to loudspeaker module 5 is got over
Greatly；
3) when running environment noise VA is greater than 105db, impact factor λ reaches maximum value, and loudspeaker directly issues road row
The acceptable maximum alarm volume of people.
(3) sound pressure level λ × B of the simulated engine running noise of acquisition is sent digital-to-analogue conversion mould by processor module 403
The digital signal of simulated engine running noise signal is converted into analog signal by D/A converter module 404 and sent by block 404
To power amplifier module 405, it is transferred to loudspeaker module 5 after driving power is amplified, is put into gear by loudspeaker module 5 in vehicle
Engine running noise is issued when in starting, reversing process and running at a low speed carries out safety prompt function to road pedestrian.
Embodiment 1
Vehicle is exercised in the quiet environment that traveling ambient noise is 20db, when vehicle has just put into gear starting or reversing, vehicle
For speed in 1km/h, loudspeaker issues the caution sound that the simulated engine that sound pressure level is 65db operates, and pedestrian can obviously perceive this
Caution sound；For vehicle when low speed is exercised, for speed within 20km/h, the caution sound maximum that loudspeaker issues is no more than 75db, and
The alarm sound of 75db can obviously cause pedestrian's note that will not cause pollution from environmental noise again.
Embodiment 2
Vehicle is exercised in the more noisy environment that traveling ambient noise is 80db, the impact factor that processor module generates
λ value is 1.13, carries out influence amendment to the sound pressure level B of basic noise signal by impact factor λ；It has just put into gear in vehicle
When step or reversing, for speed in 1km/h, loudspeaker issues the caution sound that sound pressure level is 74db, already close to quiet running environment
Under maximum caution sound, improve vehicle just put into gear starting or reversing when warning function；When speed reaches 20km/h, loudspeaking
Device issues the caution sound that sound pressure level is 85db, has been more than the ambient noise of 80db, and pedestrian can obviously perceive the caution sound, solves
The alert suggesting effect unconspicuous problem of alarm volume tabloid under noisy environment.
In conclusion the present invention is by the acquisition to running environment noise, and to the alarm for running at a low speed warning system
Sound is modified, and is enabled and is run at a low speed warning system and adapt to running environment automatically, avoids the occurrence of biggish under quiet environment
Alarm sound causes pollution from environmental noise, and the alert unconspicuous problem of suggesting effect of volume tabloid of alarming under noisy environment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of electric car of environment self-adaption runs at a low speed warning system, which is characterized in that by speed signal acquisition unit,
Gear signal acquisition unit, ambient noise acquisition unit, calculating and processing unit and loudspeaker module composition；
Speed signal acquisition unit, for acquiring the speed signal of automobilism；
Gear signal acquisition unit, for acquiring the gear signal of automobilism；
Ambient noise acquisition unit, for acquiring running car ambient noise signal；
Calculating and processing unit, for receiving and handling speed signal acquisition unit, gear signal acquisition unit and ambient noise
Speed signal, gear signal and the running environment noise signal that acquisition unit is sent are synthesized according to speed signal and gear signal
The basic noise signal of simulated engine operating, carries out influence amendment to basic noise signal according to running environment noise signal,
The operating sound signal of synthesis simulation conventional engines；
Loudspeaker module makes a sound according to the operating sound signal of synthesis simulation conventional engines to road row near vehicle
People carries out safety prompt function.
2. a kind of electric car of environment self-adaption according to claim 1 runs at a low speed warning system, which is characterized in that
The calculating and processing unit include data acquisition module, analog-to-digital conversion module, processor module, D/A converter module and function
Rate amplification module；
Data acquisition module, for receive and handle speed that speed signal acquisition unit and gear signal acquisition unit are sent and
Gear signal, and it is sent to processor module；
Analog-to-digital conversion module, the ambient noise analog signal for sending ambient noise acquisition unit are converted into digital signal,
And it is sent to processor module；
Processor module, according to the electric car speed of acquisition, gear and running environment noise signal, synthesis simulation conventional engine
The operating sound signal of machine, and it is sent to D/A converter module；
D/A converter module for conventional engines operating sound digital signal to be converted into analog signal, and is sent to power
Amplification module；
Power discharge module, the analog signal that will convert into are sent to loudspeaker module after power amplification.
3. a kind of electric car of environment self-adaption according to claim 1 or 2 runs at a low speed warning system, feature exists
In, speed signal acquisition unit and gear signal acquisition unit using the speed and gear information of CAN bus acquisition vehicle.
4. a kind of electric car of environment self-adaption according to claim 1 or 2 runs at a low speed warning system, feature exists
In speed signal acquisition unit and gear signal acquisition unit are using vehicle speed sensor and gear position sensor progress signal acquisition.
5. a kind of electric car of environment self-adaption according to claim 1 runs at a low speed warning system, which is characterized in that
Ambient noise acquisition unit is made of microphone behind microphone, left back microphone and the right side before left front microphone, the right side, left front Mike
Microphone is separately mounted to the left front, right of the outside of electric car crew module behind microphone, left back microphone and the right side before wind, the right side
Before, left back and right position, for acquiring running environment noise information.
6. a kind of electric car of environment self-adaption runs at a low speed alarming method for power, which comprises the steps of:
S1, automobilism information is obtained, the operation information includes at least vehicle speed information, synthesizes simulated engine fortune according to speed
The sound pressure level B of the basic noise signal turned, using following formula:
B=65 × V, 0≤V≤1 (1)
V≤20 B=(10 × V+1225)/19,1 < (2)
Wherein, V is speed.
S2, running environment noise information is obtained, the sound pressure level B of basic noise signal is carried out influencing to repair by running environment noise
Just, impact factor λ uses following formula:
λ=1,0≤VA < 30 (3)
λ=λmax,105≤VA (5)
Wherein, VA is running environment noise.
S3, the sound pressure level λ × B for simulating the operating sound of conventional engines is synthesized according to the modified basic noise signal of influence, by
Loudspeaker module, which makes a sound, carries out safety prompt function to road pedestrian near vehicle；
Wherein, λ is the impact factor in step S2, and B is the sound pressure level of the basic noise signal in step S1, λmax× B is road
The acceptable maximum alarm volume of pedestrian.
7. a kind of electric car of environment self-adaption according to claim 6 runs at a low speed alarming method for power, which is characterized in that
In step S1, the operation information includes vehicle speed information and gear information, is put into gear in starting and reversing process in vehicle, also basis
Speed synthesizes the basic noise signal of simulated engine operating.
8. a kind of electric car of environment self-adaption according to claim 6 runs at a low speed alarming method for power, which is characterized in that
In step S1, when speed is greater than 20km/h, the sound pressure level B of basic noise signal is 0, and warning system stops sounding.
9. a kind of electric car of environment self-adaption according to claim 6 runs at a low speed alarming method for power, which is characterized in that
In step S1, the basic noise signal of the simulated engine operating is recorded by former vehicle to be generated, and increases 2KHz~5KHz frequency range sound
Pressure improves pedestrian to the perception of caution sound, while reducing 1KHz frequency range acoustic pressure nearby, reduces screening of the ambient noise to caution sound
Lid effect.
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| CN110539692A (en) * | 2019-08-13 | 2019-12-06 | 曲阜天博汽车电器有限公司 | multifunctional automobile pedestrian warning horn and sound production method thereof |
| CN111546839A (en) * | 2020-05-25 | 2020-08-18 | 合肥威博尔汽车技术有限公司 | Low-speed running prompt tone and tire pressure detection integrated device and method for electric automobile |
| CN112298417A (en) * | 2019-07-29 | 2021-02-02 | 承铭科技股份有限公司 | Dynamic sound wave adjusting system of electric locomotive |
| WO2021057876A1 (en) * | 2019-09-27 | 2021-04-01 | 苏州上声电子股份有限公司 | Pedestrian warning device system and pedestrian warning method |
| CN112712734A (en) * | 2020-12-30 | 2021-04-27 | 潍柴动力股份有限公司 | Vehicle prompting method, device, electronic control unit, medium, and program product |
| CN114228610A (en) * | 2021-12-29 | 2022-03-25 | 马瑞利汽车零部件(芜湖)有限公司 | Automobile roof safety warning method and system and vehicle |
| CN114506268A (en) * | 2022-02-09 | 2022-05-17 | 岚图汽车科技有限公司 | Electric vehicle warning sound control method and device and electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112298417A (en) * | 2019-07-29 | 2021-02-02 | 承铭科技股份有限公司 | Dynamic sound wave adjusting system of electric locomotive |
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| CN114228610A (en) * | 2021-12-29 | 2022-03-25 | 马瑞利汽车零部件(芜湖)有限公司 | Automobile roof safety warning method and system and vehicle |
| CN114506268A (en) * | 2022-02-09 | 2022-05-17 | 岚图汽车科技有限公司 | Electric vehicle warning sound control method and device and electric vehicle |
| CN114506268B (en) * | 2022-02-09 | 2023-10-13 | 岚图汽车科技有限公司 | Control method and device for warning sound of electric vehicle and electric vehicle |
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Application publication date: 20190503 |