CN201721384U - Simulating engine sound generating device for electric vehicle - Google Patents
Simulating engine sound generating device for electric vehicle Download PDFInfo
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- CN201721384U CN201721384U CN2010201990241U CN201020199024U CN201721384U CN 201721384 U CN201721384 U CN 201721384U CN 2010201990241 U CN2010201990241 U CN 2010201990241U CN 201020199024 U CN201020199024 U CN 201020199024U CN 201721384 U CN201721384 U CN 201721384U
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Abstract
The utility model relates to a simulating engine sound generating device for an electric vehicle, which is characterized in that the engine sound when in idling is used as a basic sound pressure wave form, the frequency and sound pressure are overlapped correspondingly to the engine revolution to be enhanced, accordingly, when in idling, even through the engine stops running, the engine can generate the sound which is almost similar to the practical engine sound within the allowed range, the practical engine sound is divided into a high-frequency engine sound component, a low-frequency engine sound component and a basic sound component, the sampling period can be adjusted according to the vehicle speed, the mixed frequency ratio of the three components can be adjusted according to the vehicle speed, so the ratio of the low-frequency engine sound component can be high under the low-speed state, the ratio of the high-frequency engine sound component can be high under the high-speed state, and the simulated sound similar to the practical engine sound can be generated for the basic sound of mixed mechanical vibration sound. The utility model can regenerate the engine sound when the engine is under the idle state and also can regenerate the simulated sound similar to the practical engine sound.
Description
Technical field
The utility model relates to a kind of elec. vehicle that is equipped on, and especially is equipped on the limited Electrical Bicycle of the speed of a motor vehicle to send the electric vehicles simulated engine flexible piezoelectric sound-generating devices of simulated engine sound.
Background technology
Elec. vehicle, especially Electrical Bicycle receive much concern because of it can reduce environmental pollution, and are Electrical Bicycle more than Chinese bicycle only about half of.Yet, owing to Electrical Bicycle undisturbedly travels near the footway, thereby for the pedestrian, can't predict the close of bicycle, abnormally dangerous.On the other hand, for the driver,, can't improve driving enjoyment, blemish in an otherwise perfect thing owing to there is not engine sound.
Usually, produce the device of simulated engine sound, the engine sound of the vehicle when recording down several seconds normal operations and the voice data that stores in advance as digitized signal, operative condition (rotating speed or throttle operation amount) change tone (pitch) (frequency (height of sound)) or volume (acoustic pressure (size of sound)) corresponding to driving engine are carried out repeated regeneration, and when engine revolution is high, correspondingly increase above-mentioned tone, engine revolution lowers the tone when low, on the other hand, by trampling throttle above-mentioned volume is increased, volume is reduced by putting back to throttle.
Yet, if make simulated engine sound corresponding to practical engine speeds or throttle operation amount, electrical motor does not rotate during then owing to idling mode, can become mute state, thereby must be by operation informations such as affirmation motor speed such as instrument when vehicle operation.And when transient state that the rotating speed that is in driving engine, throttle operation amount change, simulated engine sound is nature.
To this, the open communique spy of Japanese Patent opens disclosed system 2000-1142 number, possess engine sound predesignated that acoustic pressure wave graphic data in the time is assigned to rotating speed and throttle operation amount and the model and the program (MAP) that form, and in above-mentioned model and program, be set up in parallel a plurality of unit areas that on rotating speed and throttle operation amount, have certain width respectively, on above-mentioned each unit area, store the acoustic pressure wave graphic data of engine operating status, thereby intricately forms simulated engine sound corresponding to the rotating speed of Power Component and the operational ton of throttle.
Yet intricately forms simulated sound, though can have the problem of cost costliness correctly corresponding to the speed of a motor vehicle.To this utility model, provide simply a kind of and engine sound generation device accurately.
The utility model content
Designer of the present utility model finds, usually, elec. vehicle is under idling mode, electrical motor is in halted state, the drive signals such as pulse that want to send from electrical motor are calculated out the speed of a motor vehicle and the simulated engine sound of regenerating in view of the above, engine sound during idling that the electrical motor that then is difficult to regenerate does not rotate, and the identification idling mode is exactly extremely important to driver's psychological preparation, and concerning the elec. vehicle of low speed driving, form real engine sound with idling sound as basic waveform, help the regeneration of engine sound.And, the designer observes also real engine sound and finds, high frequency engine sound composition and low frequency engine sound composition are not along with the speed of a motor vehicle together changes, but low frequency engine sound component ratio is higher when the lower-speed state of 20～30km/h, high frequency engine sound component ratio is higher when the fast state of 30km/h, and basic sound such as mechanical vibration is blended in knifeedge and wherein forms real engine sound.The purpose of the 1st utility model is to provide a kind of engine sound during with idling as basic acoustic pressure waveform, corresponding to engine speed to its overlapping frequency and acoustic pressure and make its increase, even thereby electrical motor does not rotate the idling sound of yet can regenerating when idling, when elec. vehicle allowed band 45km/h is following, almost can reproduce the simulated engine flexible piezoelectric sound-generating devices of real engine sound exactly.
And, also find, be divided into high frequency engine sound composition and low frequency engine sound composition if will constitute the composition of simulated engine sound, and with certain ratio it is blended in the basic sound such as mechanical vibration, the Electrical Bicycle below 45km/h then, the regeneration frequency by changing a real engine sound just can be corresponding to idling to low speed driving, low speed driving to running at high speed.Therefore, the purpose of the 2nd utility model is to provide a kind of simulated engine flexible piezoelectric sound-generating devices that can reproduce engine sound more true to nature.Promptly, the battery-driven car two usefulness simulated engine flexible piezoelectric sound-generating devices (200) of the 1st utility model, motor speed according to elec. vehicle, the simulated engine sound that regeneration is come out from real engine sound waveform data prediction corresponding to the speed of a motor vehicle, and send this simulated engine sound, this device (200), comprise, according to the above-mentioned speed of a motor vehicle of three-phase motor pulse measurement of elec. vehicle, and calculate out decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle and decision vehicle speed detector device (210) corresponding to the sound pressure signal of the volume gain of the speed of a motor vehicle according to impulse singla; The 1st memory storage (221) that real engine sound during with the idling predesignated in the time stores as basic acoustic pressure wave graphic data; The 2nd memory storage (222) that will temporarily store as the basic engine sound waveform from the basic acoustic pressure wave graphic data that above-mentioned the 1st memory storage reads; Receive sampled signal from above-mentioned vehicle speed detector device, and transmit the memory controller (224) of the sampled signal of the sample period (regeneration frequency) that is used to change reading speed to above-mentioned the 2nd memory storage corresponding to the speed of a motor vehicle; From the sound pressure signal of above-mentioned vehicle speed detector device 210 receptions corresponding to the speed of a motor vehicle, when idling mode, export basic acoustic pressure waveform from the 2nd memory storage, and beyond the idling state, will be adjusted into the frequency mixer (226) that carries out amplification with the acoustic pressure wave graphic data of the corresponding frequency of the speed of a motor vehicle by sound pressure signal with requirement ratio from what the 2nd memory storage sent; Reception is sent idling sound from the acoustic pressure waveform signal of frequency mixer (226) when idling mode, send the sound issue device (230) of the simulated engine sound that is adjusted into corresponding frequency with the speed of a motor vehicle and acoustic pressure beyond the idling during state.
And, the battery-driven car two usefulness simulated engine flexible piezoelectric sound-generating devices (200) of the 2nd utility model, the simulated engine sound that comes out from real engine sound waveform data prediction corresponding to the regeneration of the speed of a motor vehicle of elec. vehicle, send this simulated engine sound, this device (200), comprise, be used to store the 1st memory storage (221) of the acoustic pressure wave graphic data of the real engine sound in the time of predesignating; The acoustic pressure wave graphic data that reads from above-mentioned the 1st memory storage stores the 2nd memory storage (222) of engine sound temporarily; The acoustic pressure wave graphic data that reads from above-mentioned the 1st memory storage stores the 3rd memory storage (223) of mechanical vibration basis sound temporarily; To be distributed into the frequency divider (225) of high-frequency domain engine sound waveform component and low frequency range engine sound waveform component from the engine sound waveform that above-mentioned the 2nd memory storage read with the sample period (regeneration frequency) that is determined corresponding to the speed of a motor vehicle; According to the above-mentioned speed of a motor vehicle of three-phase motor pulse measurement of elec. vehicle, and according to the vehicle speed signal that calculates calculate out decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle, decision corresponding to the sound pressure signal of the volume gain of the speed of a motor vehicle, corresponding to the vehicle speed detector device (210) of the mixing rate signal of the high frequency engine sound composition of the speed of a motor vehicle and low frequency engine sound composition and basic sound composition; Receive sampled signal from above-mentioned vehicle speed detector device, and transmit the memory controller (224) of sampled signal that changes the sample period (regeneration frequency) of reading speed corresponding to the speed of a motor vehicle to above-mentioned the 2nd memory storage and the 3rd memory storage corresponding to the speed of a motor vehicle; Will be from above-mentioned the 3rd memory storage (223) with the basic sound waveform composition B that reads corresponding to the sample period (regeneration frequency) of speed of a motor vehicle decision and three compositions of high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L, according to above-mentioned mixing rate signal, corresponding to the speed of a motor vehicle, be mixed into the frequency mixer (226) of requirement ratio; Send the sound issue device (230) that gives the simulated engine sound of mixing corresponding to the speed of a motor vehicle.
In the 1st utility model, real engine sound waveform during with idling is as basic waveform, therefore, even measure the elec. vehicle of the speed of a motor vehicle by motor speed, the idling mode that does not rotate at electrical motor also can send idling sound, and, though be that engine sound waveform during with idling is as basic waveform, yet by adjusting its frequency and acoustic pressure, at can regenerate almost completely simulated sound with the real engine assonance of the low-speed region of elec. vehicle allowed band, therefore, from the idling to the low-speed region, can send simulated engine sound true to nature.And, in the 2nd utility model, the real engine sound sound wave of regulation is stored as basic waveform, and be divided into high frequency engine sound composition and low frequency engine sound composition and mechanical vibration Germany basic ingredient, thereby adjust regeneration frequency corresponding to the speed of a motor vehicle, and adjust acoustic pressure, the mixing ratio of three compositions, therefore corresponding to the speed of a motor vehicle, need not to use the model and the program (MAP) that store in advance, the simulated engine sound of the utmost point of also can regenerating like real engine sound.
At the utility model, basic waveform comprises basic sound compositions such as mechanical vibration, therefore, adopt voice coil loudspeaker voice coil as the sound issue device, and form the sympathetic response part and it is installed on this at the elec. vehicle vehicle seat, just can provide the vibrations that to reproduce motor bike so that the Electrical Bicycle vehicle seat shakes, and send the electric vehicles simulated engine flexible piezoelectric sound-generating devices of simulated engine sound.
At the utility model, owing to adjust high frequency engine sound composition and low frequency engine sound composition and extrude the sound composition corresponding to the speed of a motor vehicle, therefore, be stored in the real engine sound waveform data of the 1st memory storage, the real engine sound when comparatively it is desirable to use the idling of revolution between 1000～1500rpm.
Description of drawings
Fig. 1 is the constructional drawing of the related Electrical Bicycle that is equipped with the simulated engine flexible piezoelectric sound-generating devices of the utility model.
Fig. 2 is the block scheme of the related Electrical Bicycle control system of expression the utility model.
Fig. 3 is the block scheme of the vehicle of expression the 1st utility model with simulated engine flexible piezoelectric sound-generating devices structure.
Fig. 4 be expression the 1st utility model adjust the chart of example of the program of sample period and gain corresponding to the speed of a motor vehicle.
The mode chart of the real engine sound of Fig. 5 (a) when being idling, Fig. 5 (b) are the mode charts of the simulated engine sound of 2 overtones bands of the speed of a motor vehicle when being 30km/h, 2 multiplication benefits.
Fig. 6 is the block scheme of the vehicle of expression the 2nd utility model with simulated engine flexible piezoelectric sound-generating devices structure.
Fig. 7 is the block scheme of the vehicle of expression the 3rd utility model with simulated engine flexible piezoelectric sound-generating devices structure.
Fig. 8 is the mode chart when the real engine sound (a) as the basis is divided into high frequency engine sound composition (b) and low frequency engine sound composition (c).
Fig. 9 is the program of decision with respect to the mixing ratio between each mode chart of the speed of a motor vehicle.
Among the figure:
200 engine sound generation devices
210 speed of vehicle detector
220 engine sound reclaiming scraps
221 the 1st memory storages
222 the 2nd memory storages
223 the 3rd memory storages
224 memory controllers
225 frequency separators
226 frequency mixers
230 engine sound issue devices
The specific embodiment
Below, with reference to accompanying drawing, be elaborated with regard to the embodiment of the related vehicle of the utility model with the simulated engine flexible piezoelectric sound-generating devices.Embodiment to electro-tricycle of the present utility model describes below.
As shown in Figure 1, the electro-tricycle 100 of present embodiment, mainly constitute by vehicle body 110 that is provided with vehicle seat 111 and the steering hardware 120 that is arranged on these vehicle body 110 front portions, and vehicle seat 111 is provided with take one's seat switch 112 and engine sound generator 200, supply unit 113 is installed in its underpart, can the driving motor 116 of drive installation in wheel 115 by control setup 114 (not shown).
On the other hand, steering hardware 120 comprises right side throttle grip 121, left side handle 122 and left side braking handle 123, and left side braking handle 123 is provided with parking apparatus 130, and it mainly acts on is to make trailing wheel keep braking mode.In addition, symbol 124 is driving switch, the 125th, and reversing switch.
At the central portion of steering hardware 120, be provided with front panel 126, be provided with driving switch 124 in its underpart.
At vehicle seat 111, be provided with the switch 112 of taking one's seat as driver's the detecting device (omit diagram) of taking, by this switch 112 of taking one's seat, detect the driver and be sit down (taking) still leave (not taking).This switch 112 of taking one's seat, can constitute by infrared switch or limit switch, switch becomes ON when the driver is sitting on the vehicle seat 111 becomes and takes detected state, and send it to control setup 114 as the signal S2 that takes one's seat, switch then becomes OFF when the driver leaves vehicle seat 111 becomes and does not take detecting device.If the above-mentioned switch of taking one's seat is a limit switch, then make its body weight that can detect the driver, consider adult's body weight, be 30 to be sitting on the vehicle seat 111 to the people more than the 60Kg and just to send the signal S2 that takes one's seat as long as body weight is arranged.
Then, with reference to Fig. 2, describe with regard to the control system of the safety device of above-mentioned electro-tricycle 100.Promptly, safety device of the present utility model is mainly by with the switch 112 of taking one's seat of above-mentioned driving switch interlock, with the parking apparatus 130 of hand braking handle 123 interlocks and the switch 131 of parking mounted thereto, constitute with the engine sound generation device 200 of electrical motor 116 interlocks.As shown in Figure 2, open driving switch 124, drive signal S1 is sent to control setup 114.At this moment, if the driver is sitting on the vehicle seat 111, for example body weight is when 30Kg is above, and the switch 112 of taking one's seat will detect the personnel's of taking body weight, and the signal S2 that takes one's seat is sent to control setup 114.By the logic product signal of this drive signal S1 and the signal S2 that takes one's seat, control setup 114 becomes the driving readiness that electric current can be sent to electrical motor 116 from power supply.On the other hand, above-mentioned drive signal S1 also is sent to engine sound generation device 200, can make engine sound generation device 200 send idling sound.
Then, when the switch 131 of parking became the OFF state, ring off signal S3 was sent to control setup 114, and control setup 114 makes electric current be sent to electrical motor 116 from power supply 113.And acceleration device 121 can be movable, and according to its rotational angle, be sent to control setup 114 with the corresponding Acceleration Signal S4 of desired speed, thereby strengthen the driving of electrical motor 116 gradually.And, by change-over switch 127, but but actuating speed can between high-speed operation state and low-speed running state, switch.In addition, corresponding to the drive amount of electrical motor 116, engine sound generation device 200 sends simulated engine sound.
And at the utility model, if open reversing switch 125, astern signal S5 just is sent to control setup 114, can make electrical motor 116 counter-rotatings by acceleration device 121, thereby make electro-tricycle with ease astern.
Therefore, adopt above-mentioned embodiment, the driver be not sitting in vehicle seat 111 during, even driving switch 124 is in the ON state, and operated acceleration device 121 because of carelessness, electrical motor 116 can not rotate yet.And, when the driver is sitting on the vehicle seat and its body weight when surpassing limits value (for example 30Kg), the signal S2 that takes one's seat will be sent to control setup 114, thereby exist the state of drive signal S1 and the logic product signal of the signal S2 that takes one's seat to operate acceleration device 121 down, will rotating drive according to Acceleration Signal S4 electrical motor 116, electro-tricycle will advance.And,, can switch speed of advance at a high speed and between the low speed by change-over switch 127.And will move backward the time, pushing reversing switch 125, thus during the transmission of astern signal S5, can carry out ease astern by operation to acceleration device 121.
And, as long as driving switch 124 is transferred to the ON place, drive signal S1 will be sent to engine sound generation device 200, therefore, even not rotating also, electrical motor can not send idling sound, and, can send the simulated engine driving sound approximate with real engine sound when the increase of electrical motor revolution, can reproduce petrolic sound.And by reversing switch 125, can also sound the alarm retreats with notice.
Fig. 3 is the block scheme of the related engine sound generation device 200 of expression the 1st utility model.Engine sound generation device 200, mainly by the speed detector 210 of calculating the speed of a motor vehicle from the revolution counter of electrical motor M, according to the vehicle speed signal Vs from speed detector 210 produce engine sound reclaiming scrap 220 corresponding to the simulated engine sound of the speed of a motor vehicle, the engine sound issue device 230 that sends the simulated engine sound that reclaiming scrap 220 produced constitutes, when regenerating, make idling sound change its sample period (regeneration frequency (rate)) and sound pressure corresponding to the speed of a motor vehicle as basic waveform.Promptly, this engine sound generation device 200, comprise, according to the above-mentioned speed of a motor vehicle of three-phase motor pulse measurement of elec. vehicle, and calculate out decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle and decision vehicle speed detector device 210 corresponding to the sound pressure signal of the volume gain of the speed of a motor vehicle according to impulse singla; The 1st memory storage 221 that real engine sound during with the idling predesignated in the time stores as basic acoustic pressure wave graphic data; The 2nd memory storage 222 that will temporarily store as the basic engine sound waveform from the basic acoustic pressure wave graphic data that above-mentioned the 1st memory storage reads; Receive vehicle speed signal from above-mentioned vehicle speed detector device, and transmit the memory controller 224 of the sampled signal of the sample period (regeneration frequency) that is used to change reading speed to above-mentioned the 2nd memory storage corresponding to the speed of a motor vehicle; From the sound pressure signal of above-mentioned vehicle speed detector device 210 receptions corresponding to the speed of a motor vehicle, when idling mode, export basic acoustic pressure waveform from the 2nd memory storage, and beyond the idling state, will be adjusted into the frequency mixer 226 that carries out amplification with the acoustic pressure wave graphic data of the corresponding frequency of the speed of a motor vehicle by sound pressure signal with requirement ratio from what the 2nd memory storage sent; Reception is sent idling sound from the acoustic pressure waveform signal of frequency mixer 226 when idling mode, send the sound issue device 230 of the simulated engine sound that is adjusted into corresponding frequency with the speed of a motor vehicle and acoustic pressure beyond the idling during state.
Above-mentioned speed detector 210, mainly by as the pulse detector 211 of the rotation of three-phase motor pulse detection electrical motor M, to this impulse singla carry out the multiplying arrangement 212 of output after the digitalisation, the exerciser 213 that calculates the speed of a motor vehicle from this digital signal constitutes, thereby will be sent to the memory controller 224 of simulated engine flexible piezoelectric sound-generating devices 200 corresponding to the sampled signal Ssam of the speed of a motor vehicle from exerciser 213, will be sent to frequency mixer 226 corresponding to the sound pressure signal G of the speed of a motor vehicle.Usually, be adjusted into as Fig. 4 corresponding to the sampled signal Ssam of the speed of a motor vehicle and corresponding to gain (acoustic pressure) the signal G of the speed of a motor vehicle.Promptly, sampled signal Ssam is according to formula " Ssam=SV (vehicle speed signal) * constant+idling constant ", when the speed of a motor vehicle is 0km/h from idling sound reproduction position, after this shorten regeneration frequency corresponding to speed of a motor vehicle straight line, gain signal G begins to increase with the form of quadratic curve f (x) from 0km/h then according to formula " G=f (x)+idling constant " on the other hand, becomes level ground (plateau) part when 20km/h, begin to descend rapidly from 30km/h, till 40km/h, keep small state afterwards.Therefore, the basic waveform of the engine sound during as idling (with reference to Fig. 5 (a)), if be controlled to as shown in Figure 4, then the speed of a motor vehicle when the about 30km/h left and right sides, the engine sound of regeneration shown in Fig. 5 (b).
Fig. 6 is the block scheme of the related engine sound generation device 200 of expression the 2nd utility model.Engine sound generation device 200, as the 1st utility model, main by the speed detector 210 of calculating the speed of a motor vehicle from the revolution counter of electrical motor M, according to the engine sound reclaiming scrap 220 that produces from the vehicle speed signal Vs of speed detector 210 corresponding to the simulated engine sound of the speed of a motor vehicle, the engine sound issue device 230 that sends the simulated engine sound that reclaiming scrap 220 produced constitutes, yet the 2nd utility model, not only will be divided into high frequency engine sound composition and basic sound compositions such as low frequency engine sound composition and mechanical vibration as the engine sound of basic waveform, and change sample period (regeneration frequency) and sound pressure, and also adjust above-mentioned ternary mixing ratio corresponding to the speed of a motor vehicle corresponding to the speed of a motor vehicle.Promptly, the electric vehicles simulated engine flexible piezoelectric sound-generating devices 200 of the 2nd utility model, corresponding to the speed of elec. vehicle simulated engine sound from real engine sound waveform data reproduction expection, and send this simulated engine sound, this simulated engine flexible piezoelectric sound-generating devices 200, comprise, be used to store the 1st memory storage 221 of the acoustic pressure wave graphic data of the real engine sound in the time of predesignating; The acoustic pressure wave graphic data that reads from above-mentioned the 1st memory storage stores the 2nd memory storage 222 of engine sound temporarily; The acoustic pressure wave graphic data that reads from above-mentioned the 1st memory storage stores the 3rd memory storage 223 of mechanical vibration basis sound temporarily; To be distributed into the frequency divider 225 of high-frequency domain engine sound waveform component and low frequency range engine sound waveform component from the engine sound waveform that above-mentioned the 2nd memory storage read with the sample period (regeneration frequency) that is determined corresponding to the speed of a motor vehicle; According to the above-mentioned speed of a motor vehicle of three-phase motor pulse measurement of elec. vehicle, and according to the vehicle speed signal that calculates calculate out decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle, decision corresponding to the sound pressure signal of the volume gain of the speed of a motor vehicle, corresponding to the vehicle speed detector device 210 of the mixing rate signal of the high frequency engine sound composition of the speed of a motor vehicle and low frequency engine sound composition and basic sound composition; Receive vehicle speed signal from above-mentioned vehicle speed detector device, and transmit the memory controller 224 of sampled signal that changes the sample period (regeneration frequency) of reading speed corresponding to the speed of a motor vehicle to above-mentioned the 2nd memory storage and the 3rd memory storage corresponding to the speed of a motor vehicle; Will be from above-mentioned the 3rd memory storage 223 with the basic sound waveform composition B that reads corresponding to the sample period (regeneration frequency) of speed of a motor vehicle decision and three compositions of high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L, according to above-mentioned mixing rate signal, corresponding to the speed of a motor vehicle, be mixed into the frequency mixer 226 of requirement ratio; Send the sound issue device 230 that gives the simulated engine sound of mixing corresponding to the speed of a motor vehicle.
Above-mentioned engine sound reclaiming scrap 220 comprises, the input of the vehicle speed signal SV that is exported by speed detector 210 generates the memory controller 224 of the sampled signal Sc of control sample period (regeneration frequency); The 1st memory storage 221 that constitutes by the flash memory of the acoustic pressure wave graphic data that is used to store real engine sound; The acoustic pressure wave graphic data that reads by the regeneration frequency control signal Sc that is generated according to above-mentioned memory controller 224 and from above-mentioned the 1st memory storage 221 generates the 2nd memory storage 222 that the DRAM of simulated engine sound sound pressure signal forms; By sampled signal Sc that is generated according to above-mentioned memory controller 224 and the acoustic pressure wave graphic data that reads from above-mentioned the 1st memory storage 221, generate the 3rd memory storage 223 that the DRAM of analog basis sound forms with sample period of regulation; To be distributed into the frequency divider 225 of high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L from the engine sound waveform that above-mentioned the 2nd memory storage 222 read with the sample period (regeneration frequency) that is determined corresponding to the speed of a motor vehicle; Mix the frequency mixer 226 of three compositions of the basic sound waveform composition B that reads with the regeneration frequency that is determined corresponding to the speed of a motor vehicle from above-mentioned the 3rd memory storage 223 and high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L corresponding to the speed of a motor vehicle with requirement ratio, will send the sound issue device 230 that sends simulated engine sound to corresponding to the signal that the speed of a motor vehicle gives mixing.This sound issue device 230 is mainly by the amplifier 231 that above-mentioned sound pressure signal is carried out amplification, constitute with these amplifier 231 bonded assembly loud speakers or voice coil loudspeaker voice coil.
Above-mentioned the 1st memory storage 221, the bent axle of only recording rotate the real engine sound of growing during 2 times (driving engine 1 combustion cycle), and send real engine sound to the 2nd and the 3rd memory storage by drive signal.Usually, the real engine sound of 500～1000rpm of idling mode is recorded.
This real engine aud. snl. is the acoustic wave form data, basic sound composition B by the low frequency engine sound composition L of the high frequency engine sound composition H of real engine sound, real engine sound, mechanical vibration etc. constitutes, basic waveform shown in Figure 8 (a) can be divided into radio-frequency component waveform (b) and low-frequency component waveform (c).
In the present embodiment, the sample period (regeneration frequency) according to each vehicle speed signal SV that is exported based on memory controller 221, change above-mentioned three kinds of signals bit by bit.
Above-mentioned the 1st memory storage 221, when idling mode, as the engine sound of 1 combustion cycle of driving engine, recording converts real engine sound to the acoustic pressure wave graphic data of digitalized data.
Above-mentioned the 2nd memory storage 222 according to the sampled signal that above-mentioned memory controller 224 is exported, is exported the driving engine acoustic pressure wave graphic data with the corresponding frequency of the speed of a motor vehicle.On the other hand, above-mentioned the 3rd memory storage 223 according to the sampled signal that above-mentioned memory controller 224 is exported, is exported the basic acoustic pressure wave graphic data with the corresponding frequency of the speed of a motor vehicle.
At this, suppose that basic acoustic pressure wave graphic data is the engine sound of engine revolution when being the 2000rpm state, adjusts as follows when then engine revolution is the 3600rpm state.Bent axle rotates 2 times required times, is 60msec when the 2000rpm state, is about 33msec during the 3600rpm state.Therefore, change the sample period (regeneration frequency) of simulated engine sound.
The hypothetical boundary engine speed is 3000rpm, then the sound length when the rotating speed of this border be the 2000rpm state simulated engine sound length 3000/2000=1.5 doubly, thereby memory controller 224 makes the sample period (regeneration frequency) shorten 34%, and the sound length that makes bent axle rotate 2 times becomes 40msec.And the simulated engine sound length when engine speed is the 4000rpm state is 4000/2000=2.0 times, thereby the sound length that memory controller 224 makes sample period (regeneration frequency) minimizing 50% make bent axle rotate 2 times becomes 30msec.So, utilize the sample period (regeneration frequency) of memory controller 224 change simulated engine sound, can send the simulated engine sound of nature.
Therefore, the simulated engine flexible piezoelectric sound-generating devices 200 of present embodiment, the acoustic pressure wave graphic data that the bent axle of engine sound is rotated during 2 times is stored into the 1st memory storage 221, and utilize the acoustic pressure wave graphic data regeneration simulated engine sound that reads from the 1st memory storage, thereby can send simulated engine sound corresponding to the speed of a motor vehicle.Therefore, the driver of Electrical Bicycle can hear the simulated engine sound of nature.
And, in the utility model, the acoustic pressure wave graphic data is made of basic sound such as engine sound and mechanical vibration, and engine sound is divided into high and low frequency, corresponding to changing mixing ratio each other, the speed of a motor vehicle generates simulated engine sound, therefore, even with the certain speed steering vehicle, simulated engine sound also often changes, thus the fitfull engine sound of imitation explosion time.Real engine sound is divided into high frequency engine sound waveform and low frequency engine sound waveform and basic sound waveform, and the relation of the speed of a motor vehicle and high frequency engine sound waveform, low frequency engine sound waveform, basic sound waveform as shown in Figure 9.At this, the mixing rate signal has been considered the acoustic pressure ratio, yet can also make up with sound pressure signal and mixing ratio.
Therefore, at the utility model, to adjust the acoustic pressure wave graphic data of driving engine 1 combustion cycle corresponding to the regeneration frequency of the speed of a motor vehicle, from the 2nd memory storage 222 output driving engine acoustic pressure wave graphic data, from the basic acoustic pressure wave graphic data of the 3rd memory storage 223 outputs.And, utilize frequency resolution device 225, driving engine acoustic pressure wave graphic data is resolved into high frequency engine sound composition and low frequency engine sound composition.Then, according to vehicle speed signal, with as the ratio of Fig. 8 to high frequency engine sound composition and low frequency engine sound composition mixed base sound composition, and utilize microphone to regenerate with amplifier amplification it.Because the rotating speed of the recovery time of the simulated engine sound of an acoustic pressure wave graphic data with driving engine becomes, thereby the variation of simulated engine sound is very natural.
Fig. 7 represents the 3rd electric vehicles simulated engine flexible piezoelectric sound-generating devices 200, this device 200, not only utilize the interior acoustic pressure wave graphic data of the time of predesignating of frequency resolution device 226 decomposition real engine sound, and be stored in the 1st memory storage 221 in advance as basic sound waveform compositions such as high frequency engine sound waveform component and low frequency engine sound waveform component and mechanical vibration.Therefore, possess the 2nd memory storage 222 that the high frequency engine sound composition that interim storage reads from above-mentioned the 1st memory storage 221 is arranged, interim the 4th memory storage 227, the interim storage that stores the low frequency engine sound composition that reads from above-mentioned the 1st memory storage 221 from the 3rd memory storage 223 of the mechanical vibration basis sound composition that above-mentioned the 1st memory storage 221 reads.Except frequency of utilization resolver 226 not, the 2nd embodiment of other parts and Fig. 6 is identical thereby same parts is put on same-sign omit its explanation.In addition, in the 3rd utility model, different with the 2nd utility model, frequency of utilization disconnector 226 is not divided into high and low frequency, thereby can't be, yet pay attention to when it is stored in the 1st memory storage 221 thereby be out of question with software change as the crossover frequency of fulcrum.
As mentioned above, adopt the utility model, can send simulated engine sound, thereby can send corresponding to the higher simulated engine sound of the feasibility of motoring condition corresponding to the speed of a motor vehicle.
Therefore, by this simulated engine flexible piezoelectric sound-generating devices is equipped on elec. vehicle, the driver can hear the simulated engine sound of nature, and the driver need not to rely on instrument to utilize the sense of hearing just can grasp the operation information of vehicles such as motor speed.
Claims (8)
1. an electric vehicles simulated engine flexible piezoelectric sound-generating devices (200), motor speed according to elec. vehicle, the simulated engine sound that regeneration is come out from real engine sound waveform data prediction corresponding to the speed of a motor vehicle, and send this simulated engine sound, it is characterized in that:
Comprise that vehicle speed detector device (210) is measured the described speed of a motor vehicle according to the motor drive signal of elec. vehicle, and calculate out the sampled signal and decision sound pressure signal corresponding to the volume gain of the speed of a motor vehicle of decision corresponding to the sample period of the speed of a motor vehicle;
The 1st memory storage (221), the real engine sound during with the idling predesignated in the time stores as basic acoustic pressure wave graphic data;
The 2nd memory storage (222) will store as the basic engine sound waveform from the basic acoustic pressure wave graphic data that described the 1st memory storage reads temporarily;
Memory controller (224) receives sampled signal corresponding to the speed of a motor vehicle from described vehicle speed detector device, and transmits the sampled signal of the sample period/regeneration frequency that is used to change reading speed to described the 2nd memory storage;
Frequency mixer (226), from the sound pressure signal of described vehicle speed detector device (210) reception corresponding to the speed of a motor vehicle, thereby when idling mode, make described the 2nd memory storage export basic acoustic pressure waveform, and beyond the idling state, will carry out amplification by sound pressure signal with requirement ratio from being adjusted into of sending of the 2nd memory storage with the acoustic pressure wave graphic data of the corresponding frequency of the speed of a motor vehicle;
Sound issue device (230) receives the acoustic pressure waveform signal from frequency mixer (226), sends idling sound when idling mode, and sends the simulated engine sound that is adjusted into corresponding frequency with the speed of a motor vehicle and acoustic pressure during state beyond idling.
2. electric vehicles simulated engine flexible piezoelectric sound-generating devices according to claim 1 is characterized in that, also comprises:
Sound issue device (230) mainly is made of voice coil loudspeaker voice coil.
3. an electric vehicles simulated engine flexible piezoelectric sound-generating devices (200) from the simulated engine sound that real engine sound waveform data prediction comes out, sends this simulated engine sound corresponding to the speed of a motor vehicle regeneration of elec. vehicle, it is characterized in that:
Comprise that the 1st memory storage (221) is used to store the acoustic pressure wave graphic data in time of predesignating of real engine sound;
The 2nd memory storage (222), the interim engine sound that stores from the acoustic pressure wave graphic data that described the 1st memory storage reads;
The 3rd memory storage (223), the interim mechanical vibration basis sound that stores from the acoustic pressure wave graphic data that described the 1st memory storage reads;
Frequency divider (225) will be distributed into high-frequency domain engine sound waveform component and low frequency range engine sound waveform component from the engine sound waveform that described the 2nd memory storage reads with the sample period/regeneration frequency that is determined corresponding to the speed of a motor vehicle;
Vehicle speed detector device (210), measure the described speed of a motor vehicle according to the motor drive signal of elec. vehicle, and calculate out the acoustic pressure of high frequency engine sound composition and low frequency engine sound composition and basic sound composition has been considered in decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle, corresponding to the speed of a motor vehicle mixing rate signal according to the vehicle speed signal that calculates;
Memory controller (224) receives vehicle speed signal corresponding to the speed of a motor vehicle from described vehicle speed detector device, and transmits the sampled signal that changes the sample period/regeneration frequency of reading speed corresponding to the speed of a motor vehicle to described the 2nd memory storage and the 3rd memory storage;
Frequency mixer (226), the basic sound waveform composition B that will read with the sample period/regeneration frequency corresponding to speed of a motor vehicle decision from described the 3rd memory storage 223 and three compositions of high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L are mixed into requirement ratio according to described mixing rate signal corresponding to the speed of a motor vehicle;
Sound issue device (230) sends the simulated engine sound that gives mixing corresponding to the speed of a motor vehicle.
4. electric vehicles simulated engine flexible piezoelectric sound-generating devices according to claim 3 is characterized in that:
Real engine sound when the real engine sound waveform data that are stored in the 1st memory storage are idling.
5. electric vehicles simulated engine flexible piezoelectric sound-generating devices according to claim 3 is characterized in that, also comprises:
Sound issue device (230) mainly is made of voice coil loudspeaker voice coil.
6. an electric vehicles simulated engine flexible piezoelectric sound-generating devices (200) from the simulated engine sound that real engine sound waveform data prediction comes out, sends this simulated engine sound corresponding to the speed of a motor vehicle regeneration of elec. vehicle, it is characterized in that:
Comprise that the 1st memory storage (221) as basic sound waveform compositions such as high frequency engine sound waveform component and low frequency engine sound waveform component and mechanical vibration, stores the interior acoustic pressure wave graphic data of the time of predesignating of real engine sound;
The 2nd memory storage (222), the interim high frequency engine sound composition that reads from described the 1st memory storage that stores;
The 4th memory storage (227), the interim low frequency engine sound composition that reads from described the 1st memory storage that stores;
The 3rd memory storage (223), the interim storage from the mechanical vibration basis sound composition that described the 1st memory storage reads;
Vehicle speed detector device (210), measure the described speed of a motor vehicle according to the motor drive signal of elec. vehicle, and calculate out the acoustic pressure of high frequency engine sound composition and low frequency engine sound composition and basic sound composition has been considered in decision corresponding to the sampled signal of the sample period of the speed of a motor vehicle, corresponding to the speed of a motor vehicle mixing rate signal according to the vehicle speed signal that calculates;
Memory controller (224) receives vehicle speed signal corresponding to the speed of a motor vehicle from described vehicle speed detector device, and transmits the sampled signal that changes the sample period/regeneration frequency of reading speed corresponding to the speed of a motor vehicle to described the 2nd memory storage and the 3rd memory storage;
Frequency mixer (226), the basic sound waveform composition B that will read with the sample period/regeneration frequency corresponding to speed of a motor vehicle decision from described the 3rd memory storage 223 and three compositions of high-frequency domain engine sound waveform component H and low frequency range engine sound waveform component L are mixed into requirement ratio according to described mixing rate signal corresponding to the speed of a motor vehicle;
Sound issue device (230) sends the simulated engine sound that gives mixing corresponding to the speed of a motor vehicle.
7. electric vehicles simulated engine flexible piezoelectric sound-generating devices according to claim 6 is characterized in that:
Real engine sound when the real engine sound waveform data that are stored in the 1st memory storage are idling.
8. electric vehicles simulated engine flexible piezoelectric sound-generating devices according to claim 6 is characterized in that, also comprises:
Sound issue device (230) mainly is made of voice coil loudspeaker voice coil.
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| JP2010096108 | 2010-04-19 | ||
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| CN105793919B (en) * | 2013-11-28 | 2019-11-01 | 标致·雪铁龙汽车公司 | It represents means of transport power and causes the generating means of the voice signal of sense of hearing illusion |
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| CN105383410A (en) * | 2014-09-05 | 2016-03-09 | 成都勋迪电动车辆制造有限公司 | Simulated engine for electric vehicle |
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| CN107277685B (en) * | 2016-03-30 | 2021-08-31 | 福特全球技术公司 | System and method for electronic sound enhancement tuning |
| CN108267967A (en) * | 2016-12-30 | 2018-07-10 | 乐视汽车（北京）有限公司 | Electric vehicle simulates internal-combustion engines vehicle engine luggine method, apparatus and electronic equipment |
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| US10841698B1 (en) | 2019-08-05 | 2020-11-17 | Toyota Motor Engineering And Manufacturing North America, Inc. | Vehicle sound simulation based on operating and environmental conditions |
| CN110525364A (en) * | 2019-08-21 | 2019-12-03 | 中国第一汽车股份有限公司 | A kind of electric car active sonification system and its audio control method |
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| CN111863028A (en) * | 2020-07-20 | 2020-10-30 | 江门职业技术学院 | Engine sound synthesis method and system |
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