JP2008013064A - Device for transmitting operation sound of internal combustion engine of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for transmitting operation sound of an internal combustion engine of an automobile free in lay-out thereof. <P>SOLUTION: The device for transmitting operation sound of an internal combustion engine of an automobile related to operating condition of the internal combustion engine of the automobile to occupants comprises a sound pressure sensor 1 arranged inside an intake pipe 10 or suction ports 14 and 16 of the internal combustion engine to convert the intake air discharge sound of the internal combustion engine to an electric signal, an operating condition detecting means 3 for detecting the amount of operation of an accelerator pedal of the vehicle as an accelerator opening signal, a control means 5 for outputting the electric signal from the sound pressure sensor 1 by increasing/decreasing it in response to the accelerator opening signal from the operating condition detecting means 3, and an output means 4 arranged inside an engine room or a cabin and driven in response to the output signal from the control means 5 to output it as the operation sound of the internal combustion engine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving sound transmission device for an internal combustion engine for a vehicle that transmits a driving sound related to the operating state of the internal combustion engine to an occupant of the vehicle.

  2. Description of the Related Art Conventionally, a driving sound transmission device for an internal combustion engine for a vehicle that transmits a driving sound related to the driving state of the internal combustion engine of the vehicle to an occupant of the vehicle has been proposed (see Patent Documents 1 and 2).

The sound pipe (resonance pipe) and the sound generator (resonance box) that resonate with the intake sound are connected to the intake pipe of the automobile internal combustion engine in the engine room. The length of the sound pipe and the sound generator While adjusting the volume for optimum target sound quality, the sound generator resonance sound output opening end in the engine room is also the optimum target sound transmitted to the driver in the driver's seat, especially in the driver's seat The layout position is adjusted.
US Pat. No. 6,600,408 US Pat. No. 6,848,410

  However, in the above conventional example, the sound transmission characteristics up to the passenger compartment are used so that the intake and discharge sound can be heard efficiently at the driver's seat, the intake resonance pipe length is extended or shortened, and the output opening end of the intake and discharge sound is optimized. Since it was configured to be set at a proper position, it was necessary to consider handling in the engine room such as the intake resonance pipe and the intake resonance box, and there was a problem that it was difficult to secure the layout in the engine room, In addition, there is a problem that the intake and discharge sound of a single frequency that resonates with the intake resonance tube and the intake resonance box becomes difficult to distinguish from outside noise other than the intake and discharge sound.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a driving sound transmission device for an internal combustion engine for automobiles that is not restricted by the layout.

  The present invention is a driving sound transmission device for an internal combustion engine for a vehicle that transmits a driving sound related to the driving state of the internal combustion engine of the vehicle to an occupant, and is disposed in an intake pipe or an intake port of the internal combustion engine, A sound pressure sensor that converts an intake air discharge sound of the internal combustion engine into an electric signal; an operating state detecting means that detects an amount of depression of an accelerator pedal of the vehicle as an accelerator opening signal; and an electric signal from the sound pressure sensor in the operating state Control means for increasing / decreasing the output according to the accelerator opening signal from the detecting means, and the engine operating sound of the internal combustion engine by being arranged in the engine room or the vehicle interior and driven according to the output signal from the control means Output means for outputting as a feature.

  Therefore, in the present invention, a sound pressure sensor that is disposed in the intake pipe of the internal combustion engine or in the intake air intake and converts the intake discharge sound of the internal combustion engine into an electric signal, and the depression amount of the accelerator pedal of the vehicle is determined as an accelerator opening signal. Operating state detecting means for detecting as follows, control means for increasing / decreasing an electric signal from the sound pressure sensor according to an accelerator opening signal from the operating state detecting means, and an engine room or a vehicle interior. And an output means for outputting the operation sound of the internal combustion engine by being driven in accordance with the output signal from the control means, so that the intake and discharge sound according to the accelerator opening is restricted by the layout. Therefore, the degree of freedom of selection of the sound source position of the output means is expanded, and it is possible to output at any position where the sound transmission characteristics to the passenger compartment and the driver's seat are appropriate.

  Hereinafter, a driving sound transmission device for an automobile internal combustion engine of the present invention will be described based on each embodiment.

(First embodiment)
1 to 6 show a first embodiment of a driving sound transmission device for an automobile internal combustion engine to which the present invention is applied. FIG. 1 is a system configuration diagram of the driving sound transmission device for an automobile internal combustion engine. FIG. FIG. 3 is a block diagram showing the processing contents in the controller, FIGS. 4 and 5 are characteristic diagrams showing acoustic characteristics at the driver's seat, and FIG. 6 is a second diagram in which a vehicle interior microphone is added. It is a system configuration diagram showing an embodiment.

  In FIG. 1, an operation sound transmission device for an internal combustion engine for an automobile includes a sound pressure sensor 1 including a microphone or the like disposed in an intake port of an engine or an intake pipe, and a rotation pulse sensor 2 for detecting an ignition pulse of the engine. An accelerator opening sensor 3 that detects the amount of depression of the driver's accelerator pedal, a speaker 4 that is disposed in the engine room or the vehicle interior and outputs engine operating sound, the sound pressure sensor 1, and the rotation pulse sensor 2 and a controller 5 that controls the engine operating sound output from the speaker 4 based on signals from the accelerator opening sensor 3. Furthermore, a crankshaft rotation angle signal from an engine crank angle sensor 6 is input to the controller 5.

  As shown in FIG. 2, the sound pressure sensor 1 includes an outside air intake port of an air cleaner 13 connected and arranged via an air duct 12 upstream of a throttle valve 11 (electrically controlled throttle valve) arranged in an intake passage 10. 14 and the outside air intake port 16 of the air duct 15 connected further upstream of the air cleaner 13, and is discharged from the engine side via the intake sound of the outside air sucked into these intake ports 14 and 16 and the intake passage 10. The discharged sound (collectively referred to as “intake discharge sound”) is converted into an electrical signal as a sound wave signal and output.

  As shown in FIG. 3, the controller 5 includes an order filter 20 and a level adjuster 21. Based on the signal from the rotation pulse sensor 2, the order filter 20 is configured so that each frequency corresponding to a basic order (1 to n order) of the engine speed and a half order such as 0.5 order and its upper and lower It is composed of a variable frequency filter that allows passage of a sound wave signal having a frequency component with a bandwidth including the nearest region. When the engine speed changes, the order filter 20 changes each frequency corresponding to the basic order in accordance with the change in the input frequency from the rotation pulse sensor 2, and passes through the filter. Change the allowed frequency components.

  Accordingly, the sound wave signal from the sound pressure sensor 1 input to the order filter 20 is converted into frequencies corresponding to the basic order (1 to n order) of the engine speed and the half order such as 0.5 order by the order filter 20. And only the sound wave signal of the frequency component of the bandwidth including the region immediately above and below it is allowed to pass, and the sound wave signal of the frequency component in the frequency band between the basic orders is blocked from passing.

  The level adjuster 21 functions to increase / decrease the sound pressure of the sound wave signal that has passed through the order filter 20 in accordance with the opening signal from the accelerator opening sensor 3. For this reason, the sound wave signal that has passed through the order filter 20 passes through the level adjuster 21 to become a sound wave signal in which the sound pressure changes according to the accelerator opening. The sound wave signal output from the controller 5 is output to the speaker 4 with an amplification factor of a predetermined ratio by passing through the amplifier 22.

  The speaker 4 is arranged at an arbitrary sound source position where the generated driving sound can be efficiently heard in the passenger compartment, either in the engine room facing the driver's seat in the passenger compartment or below the instrument panel in the passenger compartment.

  In the driving sound transmission device for an automobile internal combustion engine having the above-described configuration, for example, by selecting the order in the order filter 20, it can be set so as not to include a 0.5th-order component. Primarily, the basic (1 to n) order component structure is provided, and a clear sound quality driving sound can be output. In addition, when a 0.5th order component is included, a strong sound quality driving sound can be output.

  When the vehicle is stopped or parked and the accelerator pedal is not depressed, the engine is in the idling rotation state (600 to 700 [rpm]), and each frequency corresponding to the basic order based on the engine rotation speed (and its upper and lower The most recent region) is on the low frequency side and the accelerator opening is near zero. Therefore, the sound wave signal output from the controller 5 is low and low, and the driving sound output from the speaker 4 is low and low. .

  When the vehicle moves to a running state and the vehicle speed is relatively low, the engine speed is also relatively low (1000 to 2000 [rpm]), so that each frequency corresponding to the basic order based on the engine speed (and its upper and lower The most recent region) is on the relatively low frequency side and the accelerator opening is also a small opening, so the sound wave signal output from the controller 5 is low and small, and the driving sound output from the speaker 4 is also low. There will be a small volume.

  When the accelerator pedal is depressed and the vehicle is accelerated, the engine speed increases according to the accelerator opening, and each frequency corresponding to the basic order based on the engine speed (and its immediate upper and lower regions) is compared. Since the accelerator opening is medium to high, the sound wave signal output from the controller 5 is high and loud, and the driving sound output from the speaker 4 is high and loud. .

  When the vehicle reaches the intended vehicle speed and the acceleration is completed and the vehicle is traveling at a high speed, the gear ratio is also changed to a high speed, so that the engine speed is in a medium to low speed (2000 to 2500 [rpm]) state corresponding to the vehicle speed. Each frequency corresponding to the basic order based on the engine speed (and the region immediately above and below it) is relatively on the middle to low frequency side, and the accelerator opening is also in the middle to low opening, so that it is output from the controller 5. The sound wave signal has a medium frequency and signal amount, and the driving sound output from the speaker 4 has a medium sound volume.

  When the vehicle is decelerated and braked, the depression of the accelerator pedal is released, so that the sound wave signal output from the controller 5 is small, and each frequency corresponding to the basic order based on the engine speed (and the region near the upper and lower sides thereof). ) Gradually shifts from the middle frequency to the lower frequency side as the engine speed is gradually decreased in response to vehicle deceleration. For this reason, the driving sound output from the speaker 4 is also a low volume sound of medium to low sound.

  FIG. 4 shows the sound pressure change characteristics (solid line) of the driving sound at the driver's seat with respect to the engine speed of the driving sound transmission device for the internal combustion engine for automobiles in this embodiment. The outside air intake port 14 of the air cleaner 13 and the air cleaner 13 Further, it is shown in comparison with a sound pressure change characteristic (broken line) of a driving sound in a natural state that is radiated from the outside air intake port 16 of the air duct 15 connected upstream and transmitted to the driver's seat in the passenger compartment through the engine room. Is. FIG. 5 shows the sound pressure change characteristic (solid line) of the driving sound at the driver's seat with respect to the engine speed of the driving sound transmission device of the automobile internal combustion engine in the present embodiment. This is shown in comparison with the sound pressure change characteristic (broken line) of the driving sound transmitted to the driver's seat.

  According to FIG. 4, the driving sound transmission device for an internal combustion engine for an automobile according to the present embodiment is based on the sound pressure characteristics of the driving sound in a natural state in a rotation region below the engine speed of 3500 [rpm]. The sound pressure is reduced, and in the rotation region of 3500 [rpm] or more, the sound pressure is increased more than the sound pressure characteristic of the driving sound in the natural state. That is, the sound pressure of the driving sound is increased by several dB (about 5 to 10 dB) in the middle to high rotation region where the outside noise increases, and the sound pressure can be clearly distinguished from the outside noise.

  Further, according to FIG. 5, the driving sound transmission device for an internal combustion engine for an automobile according to the present embodiment has a medium to high rotation region (external vehicle noise increases) as compared with the prior art that transmits a single-frequency sound pressure ( In the rotation region of 3500 [rpm] or more, the sound pressure of the driving sound is increased by about 10 to 15 dB, and the sound pressure can be further clearly distinguished from the outside noise.

  In the second embodiment of the driving sound transmission device for an automobile internal combustion engine shown in FIG. 6, the functions of the order filter 20 and the level adjuster 21 of the first embodiment are added to the existing active noise control device (active noise control device). Is built in. The active noise control device receives a crank angle signal from the crank angle sensor 6 of the engine, generates a reference signal based on the crank angle signal, and collects sound by the microphone 23 in the vehicle interior based on the reference signal. In order to reduce the noise, a sound canceling the noise is output from each speaker 4 to the vehicle interior.

  In this case, each frequency corresponding to the basic order based on the engine speed that has passed through the order filter 20 (and the region immediately above and below it) is mixed with the drive signal to each speaker 4 and output. In the vehicle interior microphone 23 for detecting the residual noise in the vehicle interior, pressure fluctuations of each frequency (and its immediate vicinity) component corresponding to the basic order based on the engine speed output from each speaker 4 are detected. However, the feedback to these noise control devices is set so as not to be fed back by adding a filter for each frequency corresponding to the basic order based on the engine speed in advance.

  By configuring as described above, even if the characteristics of the vehicle interior sound field change due to the number of passengers, the presence or absence of luggage, temperature changes, etc. Can be transmitted in a stable state.

  In the present embodiment, the following effects can be achieved.

  (A) A driving sound transmission device for an internal combustion engine for a vehicle for transmitting a driving sound related to the driving state of the internal combustion engine of the vehicle to an occupant, which is provided in the intake pipe 10 of the internal combustion engine or the intake intake ports A sound pressure sensor 1 which is arranged and converts the intake / discharge sound of the internal combustion engine into an electric signal, an operating state detection means 3 which detects the depression amount of the accelerator pedal of the vehicle as an accelerator opening signal, and the sound pressure sensor 1 A control means 5 for increasing or decreasing an electrical signal according to an accelerator opening signal from the operating state detection means 3 and a control means 5 disposed in an engine room or a vehicle compartment and driven according to an output signal from the control means 5 And output means 4 for outputting the operation sound of the internal combustion engine. Therefore, the degree of freedom in selecting the sound source position of the output means 4 can be expanded without restricting the layout of the intake / exhaust sound according to the accelerator opening, and the sound transmission characteristics up to the passenger compartment and the driver's seat can be set at any appropriate positions. It becomes possible to output.

  (A) A rotation pulse sensor 2 that outputs a pulse signal corresponding to the rotation of the internal combustion engine is provided, and the controller 5 allows passage of each rotation order component of the internal combustion engine based on the rotation pulse signal from the rotation pulse sensor 2. The frequency filter 20 is provided, and an arbitrary sound quality corresponding to the order can be output by allowing the input sound wave signal to pass and pass the rotation order component set by the frequency filter. In addition, there is no need to change the shape of the intake component 10 and to add a resonator, a sound generator, etc., and it is easy to reduce the burden of layout design in the engine room and secure the layout. Further, since the speaker installation position as the output means 4 can be arbitrarily selected, it is possible to set the sound quality without rebounding from the outside noise as the intake noise if it is output by the speaker in the vehicle interior.

  (C) An active type in which a sound wave that cancels the noise is output from a speaker 4 disposed in the vehicle interior to reduce noise collected by the sound pressure sensor 23 disposed in the vehicle interior based on a reference signal based on a crank angle signal. The speaker 4 of the noise control device constitutes the output means of the driving sound transmission device of the internal combustion engine for automobiles. The driving sound collected by the vehicle interior sound pressure sensor 23 is fed back as a sound wave that cancels the noise. If the characteristics of the vehicle interior sound field change due to the number of passengers, the presence / absence of luggage, temperature changes, etc., the noise canceling function of the active noise control device will not affect the vehicle interior conditions. Can be transmitted in a stable state.

(Second Embodiment)
7 to 10 show a second embodiment of a driving sound transmission device for an internal combustion engine for an automobile to which the present invention is applied, FIG. 7 is a perspective view showing an example of installation of a sound pressure sensor on an intake manifold, and FIG. FIG. 9 is an explanatory diagram of the arrangement state of the sound pressure sensors shown in FIG. 7, FIG. 9 is a block diagram showing the processing contents in the controller, and FIG. In this embodiment, a configuration in which a sound pressure sensor is installed in an intake manifold of an engine is added to the first embodiment. In addition, the same code | symbol is attached | subjected to the same apparatus and components as 1st Embodiment, and the description is abbreviate | omitted or simplified.

  In FIG. 7, in the driving sound transmission device for an internal combustion engine for automobiles of this embodiment, the sound pressure sensors 1 </ b> A to 1 </ b> C are not provided in the intake intake ports 14 and 16 of the engine, but are installed in the intake manifold 25. The configuration is different from that of the first embodiment. First, the intake manifold 25 will be described. The intake manifold 25 is applied to a V-type 6-cylinder engine, and is connected and fixed to the cylinder head of the engine and provided to the cylinder heads of the V-type left and right banks. An intake manifold 25A having passages (3 + 3) respectively connected to every three intake ports, and an intake manifold 25 that is connected and fixed to the upper portion of the intake manifold 25A and branches the six passages of the intake manifold 25A three by three. The lower collector 25B and the upper collector 25C of the intake manifold 25 that are connected and fixed to the upper portion of the lower collector 25B and communicate with the intake throttle valve 11 after the intake passages branched right and left are gathered at the center. FIG. 8 schematically shows an intake passage 25 constituted by the intake manifold 25A, the lower collector 25B, and the upper collector 25C.

  7 and 8, the first installation positions of the sound pressure sensors 1A to 1C are set in the intake passage 26 closest to any one of the specified intake ports of the lowermost intake manifold 25A fixed to the cylinder head. And measuring the intake and discharge sound of a specific intake port. At this installation position, only the intake / discharge sound of a specific intake port is measured. Therefore, in order to obtain the intake / discharge sound of all the cylinders, the pseudo intake sound generation block 27 described with reference to FIGS. 9 and 10 is used. It is necessary to arrange the filter before the order filter 20.

  As shown in FIG. 9, the pseudo intake sound generation block 27 includes a sampling unit 27A that takes in a sound wave signal of an intake discharge sound of a specific intake port, and a storage unit 27B that sequentially stores the sound wave signal that is taken into the sampling unit 27A. And an output unit 27C that outputs the sound wave signal stored in the storage unit 27B based on the intake start timing of each cylinder in the crank angle signal. The pseudo intake sound generation block 27 operates, for example, at every cycle operation interval in which the crankshaft rotates twice.

  Each time the sampling section 27A executes an intake stroke in which the intake port where the sound pressure sensor 1A is installed is opened by an intake valve based on the rotation pulse signal and the crankshaft rotation angle signal, Are sampled and stored by the sound wave signal input from the sound pressure sensor 1A. This sound wave signal includes sound pressures in all frequency regions. Then, the sampled sound wave signals are sequentially output to the storage unit 27B.

  The storage unit 27B sequentially stores the sound wave signals input from the sampling unit 27A. Then, in response to a request from the output unit 27C, the latest stored sound wave signal is output.

  The output unit 27C calls the latest sound wave signal stored in the storage unit 27B for each cycle operation based on the crankshaft rotation angle signal, and each cylinder during the one-cycle operation based on the crankshaft rotation angle signal. As shown in FIG. 10, the called sound wave signal is output at each timing when the intake stroke is executed. In any case, this output is output at the timing when the intake stroke of the subsequent cylinder is started before the intake stroke of the preceding cylinder is completed. That is, since the end portion and start portion of the intake stroke overlap each cylinder, the called sound wave signals are stored in a plurality of storage means so that the called sound wave signals are overlapped at this timing, for example. The means is provided.

  The pseudo intake sound wave signal output from the pseudo intake sound generation block 27 is input to the order filter 20 described in the first embodiment, and the order filter 20 causes the basic order of engine speed (0.5 order, 1 to 10). Only the sound wave signal of the frequency component of the bandwidth including each frequency corresponding to (next) and the region immediately above and below it is allowed to pass, and the sound wave signal of the frequency component in the frequency band between the basic orders is blocked from passing. . And the sound wave signal which passed the order filter 20 turns into a sound wave signal from which a sound pressure changes according to an accelerator opening degree by passing the level adjuster 21. FIG.

  In the driving sound transmission device for an internal combustion engine for an automobile using the sound pressure sensor 1A having the first installation position configured as described above, the sound wave stored in the storage unit 27B in the output unit 27C of the pseudo intake sound generation block 27. When the signal is output at equal intervals in conjunction with the intake stroke of each cylinder, the 0.5th order component can be reduced, and the basic (1 to n) th order component configuration is used, resulting in a clear sound quality. The driving sound can be output. In addition, in the output unit 27C of the pseudo intake sound generation block 27, the sound wave signal stored in the storage unit 27B is interlocked with the intake stroke of each cylinder, but is slightly shifted and output at unequal intervals. .5th order component can be included, and driving sound with strong sound quality can be output. Further, the quality of the intake / discharge sound can be set without being influenced by the shape and layout of the intake passage 26.

  The second installation position of the sound pressure sensor 1B is arranged in the center of the collection portion of the upper collector 25C of the intake manifold 25 that collects the intake passages 26 branched right and left in the center, and intake and discharge sounds of all intake ports are collected. Measure. At this installation position, the intake and discharge sounds of all the intake ports can be measured sequentially, so that the sound pressure sensor 1B does not require the pseudo intake sound generation block 27 that was required at the first installation position. The generated sound wave signal of the intake and discharge sound can be directly input to the order filter 20 as indicated by a broken line in FIG.

  In the driving sound transmission device for an internal combustion engine for an automobile using the sound pressure sensor 1B according to the second installation position, the sound pressure sensor 1B is located at an equal distance from the intake port of each cylinder. Since the intake / discharge sound detected by 1B reaches an equal interval with respect to the crank angle, the basic (1-n) -order component structure in which the 0.5th-order component is reduced is formed, and a driving sound with a clear sound quality is output. be able to.

  The third installation position of the sound pressure sensor 1C is arranged downstream of the intake throttle valve 11 of the upper collector 25C of the intake manifold 25 to measure the intake / discharge sound of all intake ports. In this installation position, the intake and discharge sounds from all the intake ports can be measured sequentially, and similarly, the sound pressure sensor is not required without using the pseudo intake sound generation block 27 required in the first installation position. The sound wave signal of the intake / discharge sound obtained in 1C can be directly input to the order filter 20, as indicated by a broken line in FIG.

  In the driving sound transmission device for an internal combustion engine for automobiles that uses the sound pressure sensor 1C according to the third installation position, the difference between the intake discharge sounds detected by the sound pressure sensor 1C from the intake port of each cylinder is large. Therefore, since the unequal intervals are reached with respect to the crank angle, it is possible to output a driving sound having a strong sound quality including a 0.5th order component.

  In the present embodiment, in addition to the effects (a) to (c) in the first embodiment, the following effects can be achieved.

  (D) The sound pressure sensor 1A is arranged so as to measure the intake / discharge sound in the intake pipe line 26 close to the intake port of the specific cylinder, and the intake / discharge sound of the specific cylinder input from the sound pressure sensor 1A is measured. By storing a sound wave signal, and storing the sound wave signal, the pseudo sound generation unit 27 that inputs the stored sound wave signal to the frequency filter 20 at a timing synchronized with the intake stroke of each cylinder of the internal combustion engine. When the signal is output at equal intervals in conjunction with the intake stroke of each cylinder, the 0.5th order component can be reduced, and the basic (1 to n) th order component configuration is used, resulting in a clear sound quality. In the output unit 27C of the pseudo intake sound generation block 27, the sound wave signal stored in the storage unit 27B is linked with the intake stroke of each cylinder, but is slightly shifted. Equality When outputting the can to be able to also contain 0.5-order component, and outputs the robust quality of operating noise. Further, the quality of the intake / discharge sound can be set without being influenced by the shape and layout of the intake passage 26.

  (E) By disposing the sound pressure sensors 1B and 1C so as to measure the intake and discharge sound in the upstream collector 25C where the intake pipes 26 branched to the respective cylinders gather or in the further upstream intake pipe 26. When the sound pressure sensor 1B is located at the same distance from the intake port of each cylinder, the intake discharge sound detected by the sound pressure sensor 1B reaches an equal interval with respect to the crank angle. It has a basic (1 to n) order component configuration with reduced components, and can output a driving sound with a clear sound quality. Further, when the difference in the distance between the sound pressure sensor 1C and the intake port of each cylinder is large, the intake discharge sound detected by the sound pressure sensor 1C reaches unequal intervals with respect to the crank angle. A powerful sound quality driving sound including the following components can be output.

1 is a system configuration diagram of a driving sound transmission device for an internal combustion engine for an automobile showing an embodiment of the present invention. Explanatory drawing which similarly shows the specific microphone layout. The block diagram which shows the processing content in a controller. The characteristic view which shows the acoustic characteristic in a driver's seat in contrast with a comparative example. The characteristic view which shows the acoustic characteristic in a driver's seat in contrast with a prior art example. The system block diagram which shows the 2nd Example which added the vehicle interior microphone. The perspective view which shows the example of installation of the sound pressure sensor to the intake manifold of the driving | operation sound transmission apparatus of the internal combustion engine for motor vehicles which shows 2nd Embodiment of this invention. Explanatory drawing of the arrangement | positioning state of the sound pressure sensor shown in FIG. The block diagram which shows the processing content in a controller. Explanatory drawing explaining the processing content of the controller of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Sound pressure sensor 2 Rotation pulse sensor 3 Accelerator opening degree sensor as a driving | running state detection means 4 Speaker as an output means 5 Controller as a control means 6 Crank angle sensor 10 Intake passage 14, 16 Air intake 20 Order filter as frequency filter 21 Level adjuster 22 Amplifier

Claims (5)

A driving sound transmission device for an internal combustion engine for a vehicle that transmits a driving sound related to the driving state of the internal combustion engine of the vehicle to an occupant,
A sound pressure sensor that is disposed in the intake pipe of the internal combustion engine or in the intake air intake and converts the intake discharge sound of the internal combustion engine into an electrical sound wave signal;
Driving state detecting means for detecting the depression amount of the accelerator pedal of the vehicle as an accelerator opening signal;
Control means for increasing and decreasing a sound wave signal from the sound pressure sensor according to an accelerator opening signal from the operating state detection means; and
An internal combustion engine for an automobile, comprising: output means arranged in an engine room or in a vehicle compartment and driven as an operation signal of the internal combustion engine by being driven according to an output signal from the control means Driving sound transmission device. The driving sound transmission device for an internal combustion engine for an automobile includes a rotation pulse sensor that outputs a pulse signal corresponding to the rotation of the internal combustion engine,
The control means includes a frequency filter that allows passage of each rotation order component of the internal combustion engine based on the rotation pulse signal from the rotation pulse sensor, and the rotation set by the frequency filter for the input sound wave signal 2. The driving sound transmission device for an internal combustion engine for an automobile according to claim 1, wherein the output is allowed while passing the order component. The sound pressure sensor is arranged to measure an intake discharge sound in an intake pipe line close to an intake port of a specific cylinder,
The control means stores the sound wave signal of the intake and discharge sound of the specific cylinder input from the sound pressure sensor, and stores the sound wave signal in the frequency filter at a timing synchronized with the intake stroke of each cylinder of the internal combustion engine. The driving sound transmission device for an internal combustion engine for an automobile according to claim 2, further comprising a pseudo intake sound generation unit for inputting.   3. The sound pressure sensor is arranged so as to measure an intake / discharge sound in an upstream collector in which intake pipes branched to respective cylinders gather or in an upstream intake pipe. 2. A driving sound transmission device for an internal combustion engine for automobiles according to 1.   The output means outputs an acoustic wave that cancels the noise from a speaker disposed in the vehicle interior to a speaker disposed in the vehicle interior in order to reduce noise collected by a sound pressure sensor disposed in the vehicle interior based on a reference signal based on a crank angle signal. 2. The system according to claim 1, wherein the operation sound collected by the vehicle interior sound pressure sensor is not fed back as a sound wave that cancels the noise. 4. The driving sound transmission device for an internal combustion engine for an automobile according to any one of 4 above.