JP2010208496A - Booming noise control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device exactly performing a prevention control of booming noise based on an estimated booming noise map. <P>SOLUTION: This booming noise control device executes a control to make booming noise difficult to be heard in a cabin when the booming noise estimated based on the estimated booming noise map fixing sound pressure of the booming noise corresponding to an operation state of a power source is determined to be defective because the booming noise exceeds criteria sound pressure fixed in advance. The booming noise control device includes booming noise detection means (S2 to S5) for detecting sound pressure of the booming noise in the cabin in a driving state of the power source, and map correction means (S6 to S8) for correcting the estimated booming noise map based on the detected sound pressure of the booming noise when there is a deviation between the sound pressure of the estimated booming noise determined from the operation state of the power source at a point of time when the booming noise is detected and the estimated booming noise map and the detected sound pressure of the booming noise. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device that performs control such as reducing or making it difficult to hear a booming noise generated in a vehicle interior when a power source such as an engine operates.

  In a vehicle that includes an internal combustion engine as a driving force source, it is known that vibrations caused by repeated fluctuations in torque output from the internal combustion engine become a muffled sound. In general, a muffled sound is a relatively low-frequency sound generated in the passenger compartment when the engine is rotating at a low engine speed of about idling speed. It is perceived as a damaging sound.

  Conventionally, a technique for reducing or making it difficult to hear a booming noise has been studied. For example, Patent Document 1 discloses that when the detected sound pressure of a booming noise is higher than a predetermined value, the rotational speed of the engine increases. Thus, there is described an apparatus configured to set a target operating point of an engine and to control the engine toward the target operating point, thereby increasing its rotational speed and thereby preventing a booming noise. . Therefore, the device described in Patent Document 1 is a device that performs control to increase the engine speed as control for avoiding the increase in the sound pressure (sound level) of the booming sound.

  In Patent Document 2, the higher the vehicle speed, the higher the vehicle speed, the greater the torque in the low engine speed region, the higher the engine operating line, and the higher noise generated by operating the engine at low engine speed and high torque. An apparatus is described that is configured to mask with the noise associated with travel. Therefore, in the apparatus described in Patent Document 2, since the vehicle speed at which the engine is operated at a low rotational speed and high torque is limited to a high vehicle speed, it is possible to avoid a situation in which the booming noise is particularly harsh. Furthermore, Patent Document 3 describes an apparatus configured to mask a booming sound with other sounds, similar to the apparatus described in Patent Document 2, and specifically, output to the passenger compartment. A device is described in which an operation line is set so that the louder the sound is, the lower the engine speed and the higher the torque. Therefore, even with the apparatus described in the cited document 3, it is possible to obviate a situation in which the muffled sound when the engine is operated at a low rotation speed and high torque is drowned out by other sounds, and the muffled sound becomes annoying. Can do.

JP 2008-57569 A JP 2007-22296 A JP 2007-131102 A

  The device described in Patent Document 1 is configured to perform control to increase the engine speed when the detected sound pressure of the booming sound is larger than a predetermined sound pressure that is a criterion. Then, it waits for the sound pressure of the booming sound to exceed a predetermined value. Therefore, before the engine speed is increased as described above, even if it is temporary, there is a situation in which the sound pressure of the booming sound increases and it cannot be avoided in advance that the sound pressure of the booming sound increases. . On the other hand, the device described in Patent Document 2 or 3 satisfies the conditions for allowing the engine to operate at a low rotational speed and high torque, such as high vehicle speed or loud noise in the passenger compartment. Since the engine is operated at a low rotation speed and high torque after waiting, it is possible to avoid a situation in which the murmuring sound becomes a problem when the murmuring sound becomes annoying.

  However, because there are unavoidable individual differences between engines and vehicles equipped with them, and changes over time occur, there may be a loud noise in an operating state different from the assumed operating state. In such a case, the devices described in Patent Document 2 and Patent Document 3 may not necessarily reliably reduce the muffled sound.

  The present invention has been made by paying attention to the above technical problem, and provides a booming sound control device that can estimate or avoid the deterioration of a booming noise in advance. It is for the purpose.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the noise that is estimated based on the estimated noise map that determines the sound pressure of the noise corresponding to the operating state of the power source is predetermined. In a vehicle noise control apparatus that performs control to make it difficult to hear a booming sound in the passenger compartment when the judgment sound pressure is exceeded, the vehicle is operated with the power source being driven. The sound pressure and the detection of the estimated hum sound obtained from the hum sound detection means for detecting the sound pressure of the murmur sound in the room, the operating state of the power source at the time of detecting the murmur sound and the estimated murmur sound map Map correction means for correcting the estimated muffled sound map based on the detected sound pressure of the muffled sound when there is a deviation from the sound pressure of the muffled sound. .

  The invention of claim 2 further comprises precondition determining means for determining that a predetermined precondition for correcting the estimated booming sound map in the invention of claim 1 is satisfied, wherein the map correcting means. Comprises means for correcting the estimated murmur sound map based on the detected sound pressure of the murmur sound when it is determined by the precondition deciding means that the precondition is satisfied. This is a vehicle noise control device.

  According to a third aspect of the present invention, in the second aspect of the present invention, the precondition is that an elapsed time after starting the power source is a reference time or more, and that the power source has been warmed up. A vehicle booming sound control apparatus comprising: at least one of sound pressures in a vehicle interior other than a sound generated by operating the power source being equal to or lower than a reference sound pressure.

  According to a fourth aspect of the invention, there is provided the transmission according to any one of the first to third aspects, further comprising a transmission connected to the output side of the power source, wherein the operating state includes the rotational speed and output torque of the power source, and A vehicle booming noise control device including a state determined based on a gear ratio set by the transmission.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the map correction means includes means for correcting an operating state of the power source with respect to the judgment reference sound pressure in the estimated ground noise map. This is a vehicle noise control device.

  According to the first aspect of the present invention, when the booming noise in the vehicle interior determined based on the estimated booming noise map is poor, the control for making it difficult to hear the booming noise so as not to become such a booming noise, for example, power Control for lowering the output torque of the power source, control for outputting a sound in a phase opposite to the booming sound, and the like are executed. The muffled sound corresponding to the operating state of the power source is estimated based on the estimated muffled sound map, but the estimated muffled sound map is corrected based on the actually detected muffled sound or its sound pressure. Is done. Therefore, the sound pressure of the booming sound estimated in correspondence with the operating state of the power source is avoided from greatly deviating from the sound pressure of the actually generated booming sound. For this reason, it is possible to suitably execute control that makes it difficult to hear the muffled sound in accordance with the actual situation, and to prevent or suppress a situation where the muffled sound becomes a problem.

  According to the invention of claim 2 and claim 3, since the disturbance factor at the time of correcting the estimated cloudy sound map can be reduced as much as possible, the correction accuracy of the estimated cloudy sound map is increased, and as a result Can be more effectively prevented or suppressed.

  According to the fourth aspect of the present invention, an estimated muffled sound map reflecting the rotation speed and torque that are the cause of the muffled sound can be obtained, so that the accuracy of the estimated muffled sound map is improved, and the muffled sound is further improved. Can be prevented or suppressed.

  According to the invention of claim 5, since the correction target may be the judgment reference sound pressure, it becomes easy to control the correction of the estimated lump sound map.

It is a flowchart for demonstrating the control performed with the control apparatus of this invention. It is a figure which shows an example of an estimated muffled sound map typically. It is a figure which shows typically a mode that an estimated muffled sound map is gradually reverse | reversed. It is a block diagram which shows typically an example of the control apparatus which concerns on this invention.

  The present invention will be described based on specific examples. The booming noise to be controlled in the present invention is a sound generated in the passenger compartment by the power source operating and outputting torque, or heard by the passenger, and is a relatively low-frequency sound that is particularly annoying for the passenger. It is. Therefore, a vehicle in which such a booming noise is a problem is a vehicle using a reciprocating type internal combustion engine as a power source, and particularly a vehicle using an internal combustion engine such as a gasoline engine or a diesel engine as a power source. The muffled sound is generated not only by the sound directly generated by the power source, but also by the resonance of the transmission mechanism or the vehicle body that transmits torque, and therefore the sound pressure (sound level) is determined by the rotational speed and torque of the power source or the power transmission system. It depends on the number of rotations.

  The control device according to the present invention estimates or determines the level of the sound pressure of the booming sound based on these various data, and if the determination of a failure is made due to the high sound pressure or the like, Control is performed to make it difficult for the passenger to hear the swaying sound, which is a control that lowers the sound pressure. Whether the booming sound is good or bad is determined based on the operating state of the vehicle including the power source and the transmission. An example of a control system for this purpose is shown in a block diagram in FIG. The target vehicle here is a vehicle that uses an internal combustion engine (hereinafter referred to as an engine) as a power source, or a vehicle that includes an engine as a power source, and controls its output torque, rotation speed, or warm-up, and these Is provided with an electronic control unit (engine ECU) 1 for detecting or determining the operation state.

  A stepped or continuously variable automatic transmission (not shown) is provided on the output side of the engine, and an electronic control device (automatic transmission ECU) 2 for controlling the automatic transmission is provided. I have. The automatic transmission electronic control unit 2 is connected to the engine electronic control unit 1 so as to be capable of data communication, and a gear ratio to be set based on information such as a required driving amount such as an accelerator opening degree and vehicle speed ( Alternatively, a shift stage) is determined and shift control is performed.

  Engines and automatic transmissions not only control the output torque, rotation speed, or gear ratio based on the driving state of the vehicle, which is represented by the amount of drive required or the vehicle speed, but also have a high sound pressure in the vehicle interior. In such a case, the torque, the rotation speed, or the gear ratio may be limited. This is a control to make it difficult to hear the muffled sound, and predicts or estimates the sound pressure of the muffled sound, and generates such sound pressure when the predicted or estimated sound pressure exceeds a threshold value. It is controlled so as to avoid the operating state of the engine and automatic transmission. A map is provided to predict or estimate the sound pressure of the booming sound. As an example, this estimated voicing sound map represents the sound pressure of the vowel sound in the passenger compartment generated by the primary explosion component of the engine as a contour line in coordinates with the engine speed and output torque as parameters. It is provided for each gear ratio set by the automatic transmission. This estimated booming sound map is prepared in advance, and can be created by actually driving the vehicle and obtaining data.

  Since the estimated booming sound map determines the sound pressure of the booming noise in correspondence with the operating state of the engine, there are individual differences and changes over time of the engine, the automatic transmission or the vehicle on which the engine is mounted. In some cases, the sound pressure of the booming sound estimated based on the map may deviate from the actual sound pressure. Therefore, the control device according to the present invention includes an electronic control device (correction ECU) 3 for performing correction control of the booming sound map. The electronic control device 3 for correction is connected to the electronic control devices 1 and 2 described above so as to be able to perform data communication. The correction control will be described later.

  Further, an electronic control device for analyzing the humming sound (ECU for humming sound analysis) 4 is provided for supplying data for correction control to the electronic control device 3 for correction. The electronic control unit 4 detects the detection signal of the in-vehicle microphone 5 installed in the vicinity of the driver's (driver's) seat, the position of the host vehicle on the map, and road information around the detected position. Data from a navigation system (navigation system) 6 that outputs information such as environmental information is input. In addition, in order to analyze the booming noise corresponding to the operating state of the engine, data such as the engine speed and the engine torque are inputted from the engine electronic control unit 1 to the booming noise analysis electronic control unit 4. .

  Next, correction control of the estimated booming sound map, which is a characteristic configuration of the control device according to the present invention, will be described. FIG. 1 is a flowchart for explaining the control. First, it is determined whether or not a precondition for correcting the booming sound map is satisfied (step S1). A booming noise is generated due to the engine being driven, but the engine operating state may be different from the normal state, and various noises associated with traveling may occur, and the vehicle There is a case where sound is emitted from an audio device mounted on the device, and such a state is a disturbance to the measurement of the muffled sound.

  Therefore, in step S1, it is confirmed that there is no such disturbance factor. Accordingly, the conditions determined in step S1 are obtained as navigation information, for example, that a predetermined time has elapsed from the start of the engine and that the engine speed and torque have stabilized, that warm-up has been completed, and that Navigation information is obtained that the road noise is traveling below a predetermined value, that the audio equipment is turned off, and that there is no large vibration source around the position where the vehicle is currently traveling. That is, the in-vehicle microphone 5 is functioning normally.

  If a negative determination is made in step S1 because the precondition is not satisfied, the routine of FIG. 1 is temporarily terminated without performing any particular control. On the contrary, if the precondition is satisfied and the determination is affirmative in step S1, the vehicle interior microphone 5 measures the sound in the vehicle (step S2) and takes in the vehicle sound data. (Step S3). A booming sound is analyzed from the in-vehicle sound thus obtained (step S4). That is, the primary explosion component of the engine is taken out, and the sound pressure is obtained in correspondence with the engine speed, the engine torque, and the gear position. In this way, the actually measured sound level is obtained (step S5).

  If there is a deviation between the measured sound level and the estimated sound level determined in the estimated sound level map, the estimated sound level is corrected based on the actually measured sound level (step S6). ). As described above, the estimated muffled sound map has the sound pressure of the primary component of the engine explosion at the coordinates where the engine speed and the engine torque are taken on the horizontal axis and the vertical axis for each gear ratio (speed stage). This is represented by contour lines, an example of which is schematically shown in FIG. The example shown here is a map when the automatic transmission connected to the engine is set to the seventh forward speed, which is the highest speed stage, and the sound pressure of the booming noise increases with the engine torque and the engine speed. Increases as the rotational speed decreases. Among these sound pressures, the sound pressure that is acceptable for a vehicle varies depending on the vehicle type, vehicle grade, etc., but in any case, the sound pressure that is used as a judgment criterion is determined, and an operation that produces a loud sound that is larger than the judgment reference sound pressure The state (sound pressure region) is a defective region or a non-permitted region, and a state where the sound pressure is lower than that is permitted. In the example shown in FIG. 2, 75 dB is used as a judgment reference sound pressure (buzzing sound threshold), and the high rotation speed side and the low torque side from the 75 dB line are in a good booming sound area, and the low rotation speed side of 75 dB line or higher. The high-torque side is a muffled sound defect region.

  Controls that make it difficult to hear the muffled sound, such as prohibiting the gear ratio or speed determined based on the required drive amount or vehicle speed based on the sound pressure of the muffled sound, determine whether the estimated sound pressure is higher than the judgment reference sound pressure. It is executed based on the determination result. Accordingly, since the judgment reference sound pressure is required for the control, this judgment reference sound pressure is corrected. In the example shown in FIG. 2, the 75 dB line is corrected.

  More specifically, this is an operating state in which a sound pressure of 75 dB measured at a point B in FIG. 2 is measured when the vehicle travels with the seventh forward speed set and the above-mentioned preconditions are satisfied. In this case, since the point B is an operation state at a low speed side or a high rotation speed side from the judgment reference line in the estimated picking-up sound map, the picking-up sound level is high even in a good region. An operation state that causes a failure occurs. Therefore, based on the divergence width in the rotational speed direction (horizontal axis direction) or torque direction (vertical axis direction) between the 75 dB line that is the judgment reference sound pressure in the estimated booming sound map and the point B that is the actual measurement data, The 75 dB line is corrected. For example, weighting such as multiplying a deviation width of the engine torque on the same engine speed by a predetermined coefficient is performed, and the 75 dB line is partially moved to the low torque high speed side according to the value thus obtained. Note that the weighting may not be able to say that the actual measurement data is completely accurate. It is processing. Therefore, the weighting method or coefficient may be appropriately selected based on experiments or experience. The contour lines of the judgment reference sound pressure corrected based on the B point which is actually measured data are indicated by broken lines in FIG.

  An estimated pick-up sound map corrected in this way is created (step S7), this is replaced with an existing map to form a new estimated pick-up sound map (step S8), and this routine is temporarily ended. Since the routine shown in FIG. 1 is repeatedly executed at predetermined time intervals, correction is performed for each of various operation states determined by the engine speed, the engine torque, and the gear ratio. Therefore, when the sound pressure of the booming sound is high due to individual differences or changes over time, many points on the contour line indicating the judgment reference sound pressure are moved to the low torque high rotation speed side, finally, The entire contour line is changed to the low torque high rotation speed side. The situation is schematically shown in FIG.

  When the vehicle is running and the vehicle speed increases, an upshift occurs, and as a result, when the maximum speed or the gear stage used in the normal cruise state (for example, the seventh speed) is set, An estimated muffled sound map for the seventh speed is read. This is shown as time T1 in FIG. Thereafter, when it is determined that the elapsed time after starting the engine exceeds a predetermined threshold, and at the same time, the preconditions such as the absence of a large vibration source in the vicinity of the traveling position are satisfied from the navigation information at that time (time T2). Then, the correction processing permission flag is turned ON, and the above-described map correction control is executed. As a result, the actual booming sound level corresponding to the operation state (engine speed, engine torque, gear ratio) at that time is obtained, and the judgment reference sound pressure (75 dB line) based on the actual booming sound level is partially corrected.

  If the precondition for correction control is satisfied at the time T3 when the engine speed increases as the vehicle speed increases and the engine torque increases, the same correction control as described above is executed again. . As a result, an actual booming sound level corresponding to an operation state different from the time point T2 described above is obtained, and the judgment reference sound pressure (75 dB line) based thereon is partially corrected.

  Thereafter, for example, it is determined based on the navigation information that there is a large vibration source in the vicinity of the travel position. As a result, if the above-described precondition is not satisfied, the correction processing permission flag is set to 0FF at the same time, and estimation is performed. Sound map correction control is prohibited. Therefore, in this state (at time T4), since the estimated cloudy sound map is not corrected, it is possible to avoid a map incorporating disturbance.

  When the vehicle travels and the driving environment satisfies the above-described preconditions, the correction processing permission flag is turned ON again, and the actual booming sound level corresponding to the operation state at each time point (T5 time point, T6 time point) is obtained. The judgment reference sound pressure (75 dB line) based thereon is partially corrected. Accordingly, since the number of correction points for the judgment reference sound pressure is gradually increased, the contour line indicating the reference sound pressure for judging the sound pressure of the booming sound is close to the actually measured data.

  The corrected estimated sound volume map thus accurately reflects the sound pressure of the actually generated sound, so that the estimated sound pressure of the sound is calculated by using the corrected estimated sound volume map. It becomes closer to the sound pressure actually generated, and as a result, the estimation accuracy of the sound pressure of the booming sound is increased. Therefore, there is a situation in which the noise of the vehicle interior becomes louder while driving, or on the contrary, the operation state with good fuel efficiency is unnecessarily prohibited and driving with low fuel efficiency is forced to deteriorate the fuel efficiency. It can be prevented in advance.

  Here, the relationship between the above specific example and the present invention will be briefly described. The functional means for executing steps S2 to S5 shown in FIG. 1 corresponds to the booming sound detecting means in the present invention, and steps S6 to S8 are performed. The functional means to execute corresponds to the map correction means in this invention. Furthermore, the functional means for executing step S1 corresponds to the precondition determining means in the present invention.

  Note that the present invention is not limited to the above-described specific example, and in the case where the measurement of the booming sound and the correction of the map based on the measurement result are performed in an environment such as a bench test, the above-described step S1 is performed. It is not necessary to judge whether a precondition is satisfied. Controls that make it difficult to hear the muffled sound include control that changes the gear ratio to change the engine speed to another speed, control that outputs a sound in the opposite phase to the muffled sound, and engine throttle opening. The point of control, such as control for changing the degree, may be control that makes it difficult for the passenger to hear the booming sound.

  DESCRIPTION OF SYMBOLS 1 ... Engine electronic control device (engine ECU), 2 ... Automatic transmission electronic control device (automatic transmission ECU), 3 ... Boom sound correction control electronic control device (correction ECU), 4 ... Boom sound analysis Electronic control device (buzzing sound analysis ECU), 5 ... In-vehicle microphone, 6 ... Navigation system (navigation system).

Claims (5)

When it is determined that the sound of the booming sound estimated based on the estimated sounding sound map corresponding to the operating state of the power source exceeds the predetermined judgment reference sound pressure In addition, in a vehicle noise control device that performs control to make it difficult to hear the noise in the passenger compartment,
A hum sound detecting means for detecting the sound pressure of the squeaking noise in the passenger compartment while driving the power source;
The detection is performed when there is a deviation between the sound pressure of the estimated humming sound obtained from the operating state of the power source at the time of detecting the humming sound and the estimated murmur sound map and the sound pressure of the detected murmur sound. A vehicle noise control apparatus, comprising: a map correction unit that corrects the estimated noise map based on the sound pressure of the noise. A precondition determining means for determining that a predetermined precondition for correcting the estimated booming sound map is satisfied;
The map correcting unit includes a unit that corrects the estimated sounding map based on the detected sound pressure of the picking sound when the precondition determining unit determines that the precondition is satisfied. The vehicle's booming sound control apparatus according to claim 1.   The preconditions are that the elapsed time after starting the power source is a reference time or more, that the power source has been warmed up, and that the vehicle other than the sound due to the power source operating. The vehicle's booming sound control device according to claim 2, comprising at least one of the sound pressure of the indoor sound being equal to or lower than a reference sound pressure. A transmission connected to the output side of the power source;
The vehicle operating state according to any one of claims 1 to 3, wherein the operating state includes a state determined based on a rotational speed and output torque of the power source and a speed ratio set by the transmission. Sound control device.   5. The vehicle parking according to claim 1, wherein the map correction unit includes a unit that corrects an operation state of the power source with respect to the judgment reference sound pressure in the estimated clouding sound map. Sound control device.

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