Vehicle control apparatus

Abstract

To provide a vehicle control apparatus capable of controlling a control target so as to generate a sound of a sound pressure level that is higher than background noise regardless of a magnitude of a frequency of the background noise.SOLUTION: An apparatus includes: a control part for controlling a movement of a control target provided in a vehicle; and a record part for storing a record of a first relational expression 38 specifying a relation between a frequency and a sound pressure level of sound issued from the control target when the control target moves. The control part identifies, a control frequency that acquires a given first sound pressure level when applied to the first relational expression and acquires a second sound pressure level being higher than the first sound pressure level when applied to second relational expressions 32, 34 that specify a relation between a frequency and a sound pressure level of background noise surrounding the control target; and moves the control target by the control frequency.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle control device. [Background technology]

[0002] The following Patent Document 1 discloses a vehicle in which the rate of change of the compressor rotation speed is controlled based on the vehicle speed in order to rotate the compressor so as not to produce a sound louder than background noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-193283 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle of Patent Document 1, depending on the frequency of the background noise, the sound pressure level of the compressor may become higher than the sound pressure level of the background noise.

[0005] In consideration of the above, an object of the present invention is to provide a vehicle control device capable of controlling a controlled object so as not to emit a sound with a sound pressure level higher than background noise, regardless of the magnitude of the frequency of the background noise. [Means for solving the problem]

[0006] A vehicle control device of a first aspect includes a control unit that controls the operation of a controlled object provided in a vehicle, and a recording unit in which a first relational equation that defines the relationship between the frequency and sound pressure level of a sound emitted by the controlled object when the controlled object operates is recorded, wherein the control unit identifies a control frequency that is applied to the first relational equation to obtain a predetermined first sound pressure level, and that is applied to a second relational equation that defines the relationship between the frequency and sound pressure level of background noise surrounding the controlled object to obtain a second sound pressure level higher than the first sound pressure level, and operates the controlled object at the control frequency.

[0007] In the vehicle control device of the first aspect, a first sound pressure level is obtained by applying a control frequency to a first relational expression. Furthermore, a second sound pressure level higher than the first sound pressure level is obtained by applying the control frequency to a second relational expression that defines the relationship between the frequency and sound pressure level of background noise around the controlled object. Furthermore, a control unit operates the controlled object at the control frequency. Therefore, the vehicle control device of the first aspect can control the controlled object not to emit a sound with a sound pressure level higher than the background noise, regardless of the magnitude of the frequency of the background noise.

[0008] The vehicle control device of a second aspect is the first aspect, wherein when the control unit changes the control frequency, the control unit makes an absolute value of the amount of change in the control frequency greater than a predetermined first set value.

[0009] According to the second aspect, it is highly likely that the controlled object can be controlled so as not to emit a sound with a sound pressure level higher than the background noise, regardless of the magnitude of the frequency of the background noise.

[0010] A third aspect of the vehicle control device is the second aspect, wherein the control unit sets an absolute value of the amount of change in the control frequency to be smaller than a second set value that is larger than the first set value.

[0011] According to the third aspect, it is highly likely that the controlled object can be controlled so as not to emit a sound with a sound pressure level higher than the background noise, regardless of the magnitude of the frequency of the background noise.

[0012] In the vehicle control device of the fourth aspect, in the first or second aspect, the control unit specifies the control frequency when there are multiple second relational expressions so that the first sound pressure level is lower than the second sound pressure level that is maximum when the control frequency is applied.

[0013] According to the fourth aspect, even when there are a plurality of second relational expressions, it is possible to control the controlled object so as not to emit a sound with a sound pressure level higher than the background noise, regardless of the magnitude of the frequency of the background noise. Effect of the Invention

[0014] As described above, the vehicle control device according to the present invention has the excellent effect of being able to control a controlled object so as not to emit a sound with a sound pressure level higher than background noise, regardless of the magnitude of the frequency of the background noise. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic side view of a vehicle equipped with a vehicle control device according to an embodiment. [Diagram 2] 2 is a control block diagram of an ECU of the vehicle shown in FIG. 1. [Diagram 3] FIG. 3 is a functional block diagram of the ECU shown in FIG. 2. [Figure 4] FIG. 2 is a diagram showing a control map showing the relationship between the frequency and sound pressure level of a compressor and the relationship between the frequency and sound pressure level of background noise. [Diagram 5] 5 is a diagram showing how the vehicle control device of the comparative example and the embodiment controls the compressor using a control map. FIG. [Figure 6] 4 is a flowchart showing a process executed by a CPU of the ECU. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle control device according to the present invention will be described with reference to the accompanying drawings.

[0017] A vehicle 10 to which the vehicle control device of this embodiment is applied has an electric motor 12 and a battery 14 as shown in Fig. 1. The electric motor 12 is a drive source for the vehicle 10, and operates by receiving electric power supplied from the battery 14. In other words, the vehicle 10 of this embodiment is a BEV (Battery Electric Vehicle). The vehicle 10 further includes a vehicle speed sensor 15, a sound pickup microphone 16, and a blower 17. For example, a voice recognition microphone and an error microphone for active noise cancellation can be used as the sound pickup microphone 16.

[0018] The vehicle 10 further includes a cooling device for cooling the battery 14. The cooling device includes a rotary compressor (object to be controlled) 18. The vehicle 10 further includes an ECU (Electronic Control Unit) 21 connected to the electric motor 12, the battery 14, the vehicle speed sensor 15, the sound pickup microphone 16, the blower 17, and the compressor 18.

[0019] 2, the ECU 21 includes a CPU (Central Processing Unit: processor) (control unit) 22, a ROM (Read Only Memory) 23, a RAM (Random Access Memory) 24, a storage (recording unit) 25, a communication I / F (Interface) 26, and an input / output I / F 27. The CPU 22, the ROM 23, the RAM 24, the storage 25, the communication I / F 26, and the input / output I / F 27 are connected to each other so as to be able to communicate with each other via a bus 28. The ECU 21 can obtain information relating to date and time from a timer (not shown).

[0020] The CPU 22 is a central processing unit that executes various programs and controls each part. That is, the CPU 22 reads a program from the ROM 23 or the storage 25, and executes the program using the RAM 24 as a working area. The CPU 22 controls each component and performs various calculation processes (information processing) according to the program recorded in the ROM 23 or the storage 25.

[0021] The ROM 23 stores various programs and various data. The RAM 24 temporarily stores programs or data as a working area. The storage 25 is configured by a storage device such as a hard disk drive (HDD) or a solid state drive (SSD), and stores various programs and various data. The communication I / F 26 is an interface capable of communicating with devices located outside the vehicle 10. For example, the communication I / F 26 is capable of wireless communication with an external server (not shown). The communication I / F 26 uses communication standards such as Bluetooth (registered trademark) and Wi-Fi (registered trademark). Furthermore, the communication I / F 26 is capable of communicating with an ECU other than the ECU 21 provided in the vehicle 10 via an external bus. The input / output I / F 27 is an interface for communicating with various devices.

[0022] 3, the ECU 21 has, as its functional components, a background noise recognition unit 221 and a compressor control unit 222. The background noise recognition unit 221 and the compressor control unit 222 are realized by the CPU 22 of the ECU 21 reading out and executing a program stored in the ROM 23.

[0023] The background noise recognition unit 221 recognizes the background noise inside the vehicle 10 based on the background noise components. The background noise components include the sound captured by the sound pickup microphone 16.

[0024] The background noise recognition unit 221 generates a background noise relational equation (second relational equation) that expresses the relationship between the frequency (Hz) and sound pressure level (dBA) of the background noise based on the acquired background noise components every time a predetermined time elapses. For example, the background noise recognition unit 221 generates a background noise relational equation while performing frequency analysis processing every few seconds. For example, the second background noise relational equation (second relational equation) 34 shown in FIG. 4 is an example of a background noise relational equation generated by the background noise recognition unit 221. For example, the second background noise relational equation 34 is generated when the vehicle 10 is moving at a high speed, a loud sound is generated around the vehicle 10, and the blower 17 is rotating at a high speed. Note that when there are multiple noise sources inside and outside the vehicle 10, the background noise recognition unit 221 may generate multiple background noise relational equations at the same time.

[0025] In addition, the first background noise relational expression (second relational expression) 32 in the case where the vehicle speed of the vehicle 10 is low, no loud noise is generated around the vehicle 10, and the blower 17 rotates at a low speed has been obtained in advance by experiment and recorded in advance in the storage 25.

[0026] When the frequency is f and the sound pressure level is SL, the first background noise relational expression 32 and the second background noise relational expression 34 are as follows. SL=P_bgn1(f) First background noise equation SL=P_bgn2(f)...Second background noise equation

[0027] The first background noise relation 32 and the background noise relation (e.g., the second background noise relation 34) generated by the background noise recognition unit 221 are part of the control map 30 shown in Fig. 4 and recorded in the storage 25. Every time the background noise recognition unit 221 generates a new background noise relation, the control map 30 is updated.

[0028] The control map 30 includes a compressor relational equation (first relational equation) 38 that represents the relationship between the frequency (rotation speed) and the sound pressure level of the compressor 18. The compressor relational equation 38 has the following content. SL=Pu(f)···Compressor equation As is clear from Fig. 4, compressor relation 38 indicates that the sound pressure level of compressor 18 increases monotonically as the frequency of compressor 18 increases. If the frequency of compressor 18 is f (Hz) and the number of revolutions per minute of compressor 18 is N (rpm), then f = N / 60.

[0029] The compressor control unit 222 controls the compressor 18 based on the control map 30. More specifically, the compressor control unit 222 controls the compressor 18 at a control frequency that is a predetermined frequency f. The sound pressure level of the compressor 18 when rotating at the control frequency (first sound pressure level) is lower than the sound pressure level (second sound pressure level) obtained by applying the control frequency to the background noise relational expression.

[0030] For example, assume that the control map 30 includes the first background noise relation 32 but does not include the second background noise relation 34. For example, when the magnitude of the frequency f is frequency F3, the sound pressure level (first sound pressure level) of the compressor 18 is smaller than the sound pressure level (second sound pressure level) represented by the first background noise relation 32. Therefore, even if the compressor control unit 222 rotates the compressor 18 at the frequency F3, there is little risk that the sound generated by the compressor 18 will be annoyed to the passengers. Also, when the magnitude of the frequency f is frequency F4, the sound pressure level (first sound pressure level) of the compressor 18 is slightly smaller than the sound pressure level (second sound pressure level) represented by the first background noise relation 32. That is, the frequency F4 is the maximum value of the frequency f in a range in which the difference between the second sound pressure level and the first sound pressure level does not become zero. Therefore, even if the compressor control unit 222 rotates the compressor 18 at the frequency F4, there is little risk that the sound generated by the compressor 18 will be annoyed to the passengers. On the other hand, when the magnitude of the frequency f is frequency F5, the sound pressure level (first sound pressure level) of the compressor 18 is higher than the sound pressure level (second sound pressure level) represented by the first background noise relational expression 32. Therefore, when the compressor control unit 222 rotates the compressor 18 at the frequency F5, there is a risk that the sound generated by the compressor 18 will be annoyed to the passengers. Furthermore, for example, when the magnitude of the frequency f is changed from frequency F3 to frequency F2, the sound pressure level (first sound pressure level) of the compressor 18 becomes slightly smaller than the sound pressure level (second sound pressure level) represented by the first background noise relational expression 32. That is, the frequency F2 is the minimum value of the frequency f in the range in which the difference between the second sound pressure level and the first sound pressure level does not become zero.

[0031] Also, assume that the control map 30 includes the first background noise relation 32 and the second background noise relation 34. As is clear from FIG. 4, the sound pressure level of the second background noise relation 34 is greater than the sound pressure level of the first background noise relation 32 at all frequencies. Therefore, the compressor control unit 222 controls the compressor 18 based on the second background noise relation 34 and the compressor relation 38. For example, when the magnitude of the frequency f is the frequencies F2, F3, F4, and F5, the sound pressure level (first sound pressure level) of the compressor 18 is smaller than the sound pressure level (second sound pressure level) represented by the second background noise relation 34. Therefore, even if the compressor control unit 222 rotates the compressor 18 at the frequencies F2, F3, F4, and F5, there is little risk that the passengers will find the sound generated by the compressor 18 annoying. Furthermore, when the magnitude of the frequency f is frequency F6, the sound pressure level (first sound pressure level) of the compressor 18 is slightly smaller than the sound pressure level (second sound pressure level) represented by the second background noise relational expression 34. That is, the frequency F6 is the maximum value of the frequency f in the range in which the difference between the second sound pressure level and the first sound pressure level does not become zero. Therefore, even if the compressor control unit 222 rotates the compressor 18 at the frequency F6, there is little risk that the sound generated by the compressor 18 will be annoyed to the passenger. On the other hand, when the magnitude of the frequency f is frequency F7, the sound pressure level (first sound pressure level) of the compressor 18 is larger than the sound pressure level (second sound pressure level) represented by the second background noise relational expression 34. Therefore, when the compressor control unit 222 rotates the compressor 18 at the frequency F7, there is a risk that the sound generated by the compressor 18 will be annoyed to the passenger. Furthermore, for example, when the magnitude of frequency f is changed from frequency F3 to frequency F1, the sound pressure level of compressor 18 (first sound pressure level) becomes slightly smaller than the sound pressure level (second sound pressure level) expressed by second background noise relational expression 34. In other words, frequency F1 is the minimum value of frequency f in the range in which the difference between the second sound pressure level and the first sound pressure level does not become zero.

[0032] In addition, due to the disturbance generated when the second background noise relational expression 34 is included in the control map 30, as shown in FIG. 4, a part of the second background noise relational expression 34 may change to a disturbance part 34X. For example, when the vehicle 10 travels on a rough road surface, when heavy rain starts to fall, or when the sound pressure level generated by a speaker (not shown) of the vehicle 10 temporarily increases, a disturbance occurs. In this case, when the magnitude of the frequency f is between the frequency F8 and the frequency F9, the sound pressure level (first sound pressure level) of the compressor 18 is smaller than the sound pressure level (second sound pressure level) represented by the second background noise relational expression 34 (disturbance part 34X).

[0033] The rotation speed of the compressor 18 changes according to the temperature of the battery 14 and the like. That is, when the temperature of the battery 14 and the like changes, a battery control unit (not shown) calculates a required frequency. The compressor control unit 222 performs rotation control of the compressor 18 while referring to the calculated required frequency. That is, the compressor control unit 222 controls the rotation of the compressor 18 while changing the magnitude of the frequency f so that the magnitude of the frequency f at the current time approaches the required frequency.

[0034] For example, assume a case where the compressor 18 is rotating at the frequency F4 when the first background noise relational expression 32 and the second background noise relational expression 34 are included in the control map 30. Further, assume a case where the required frequency is the frequency F5. That is, assume a case where the required frequency is higher than the current frequency. Here, when the frequency f at the current time is set as the frequency F, in this case, the compressor control unit 222 sets a first set frequency F+Fmin and a second set frequency F+Fmax shown by solid lines. The Fmin which is the first set value and the Fmax which is the second set value are each a predetermined constant value, and the absolute value of Fmin < the absolute value of Fmax. Fmin is the minimum value of the absolute value of the change amount of the frequency when changing the frequency of the compressor 18, and Fmax is the maximum value of the absolute value of the change amount of the frequency when changing the frequency of the compressor 18.

[0035] The compressor control unit 222 can change the frequency f only in the range between the first set frequency F+Fmin shown by the solid line and the second set frequency F+Fmax shown by the solid line. In this case, the frequency F5 is greater than the second set frequency F+Fmax. Furthermore, the sound level of the compressor relational expression 38 at the second set frequency F+Fmax is smaller than the sound pressure level of the second background noise relational expression 34 at the second set frequency F+Fmax. Therefore, in the first rotation control of the compressor 18, the compressor control unit 222 changes the frequency f of the compressor 18 from the frequency F4 to the second set frequency F+Fmax.

[0036] When the first rotation control of the compressor 18 is completed, the compressor control unit 222 again sets the first set frequency F+Fmin indicated by the two-dot chain line and the second set frequency F+Fmax indicated by the two-dot chain line. In this case, the frequency F5 is included in the range between the first set frequency F+Fmin and the second set frequency F+Fmax. Furthermore, the sound level of the compressor relational expression 38 at the frequency F5 is smaller than the sound pressure level of the second background noise relational expression 34 at the frequency F5. Therefore, in the second rotation control of the compressor 18, the compressor control unit 222 changes the frequency f of the compressor 18 to the frequency F5.

[0037] For example, assume that the compressor 18 is rotating at a frequency F4 and the required frequency is a frequency F4a. Since this frequency F4a is smaller than the first set frequency F+Fmin shown by the solid line, the compressor control unit 222 does not increase (change) the frequency of the compressor 18.

[0038] Next, assume that the compressor 18 is rotating at a frequency F4 when the control map 30 includes the first background noise relational expression 32 and the second background noise relational expression 34. Furthermore, assume that the required frequency is frequency F3. In other words, assume that the required frequency is smaller than the current frequency. Here, if the frequency f at the current time is frequency F, then in this case the compressor control unit 222 sets the first set frequency F-Fmin indicated by the dashed line and the second set frequency F-Fmax indicated by the dashed line.

[0039] The compressor control unit 222 can change the frequency f only in the range between the first set frequency F-Fmin shown by the dashed line and the second set frequency F-Fmax shown by the dashed line. In this case, the frequency F3 is lower than the second set frequency F-Fmax shown by the dashed line. Furthermore, the sound level of the compressor relational expression 38 at the second set frequency F-Fmax is lower than the sound pressure level of the second background noise relational expression 34 at the second set frequency F-Fmax. Therefore, in the first rotation control of the compressor 18, the compressor control unit 222 changes the frequency f of the compressor 18 from the frequency F4 to the second set frequency F-Fmax.

[0040] When the first rotation control of the compressor 18 is completed, the compressor control unit 222 again sets the first set frequency F-Fmin indicated by the dashed line and the second set frequency F-Fmax indicated by the dashed line. In this case, the frequency F3 is included in the range between the first set frequency F-Fmin indicated by the dashed line and the second set frequency F-Fmax indicated by the dashed line. Furthermore, the sound level of the compressor relational expression 38 at the frequency F3 is smaller than the sound pressure level of the second background noise relational expression 34 at the frequency F3. Therefore, in the second rotation control of the compressor 18, the compressor control unit 222 changes the frequency f of the compressor 18 to the frequency F3.

[0041] For example, assume that the compressor 18 is rotating at a frequency F4 and the required frequency is a frequency F4b. Since this frequency F4b is greater than the first set frequency F-Fmin indicated by the dashed line, the compressor control unit 222 does not reduce (change) the frequency of the compressor 18.

[0042] Among the above-described configuration, the ECU 21 and the control map 30 are components of the vehicle control device 40.

[0043] Next, a description will be given of the processing executed by the CPU 22 of the ECU 21. The CPU 22 repeatedly executes the processing of the flowchart shown in FIG.

[0044] In step S10 (hereinafter, the word "step" will be omitted), the CPU 22 determines whether or not the required frequency calculated by the battery control unit has been acquired.

[0045] If the result of the determination in S10 is Yes, the CPU 22 proceeds to S11 and determines whether or not the requested frequency is higher than the first set frequency F+Fmin.

[0046] If the answer is Yes in S11, the CPU 22 proceeds to S12 to determine whether or not there is a frequency f that is greater than the frequency F of the compressor 18 at the current time and that makes the value of the background noise relational expression greater than the value of the compressor relational expression .

[0047] If the result of the determination in S12 is Yes, the CPU 22 proceeds to S13 and determines whether or not there is a frequency f that is greater than the first set frequency F+Fmin and smaller than the smaller value between the second set frequency F+Fmax and the requested frequency.

[0048] If the answer to the question in S13 is Yes, the CPU 22 proceeds to S14, where it changes the frequency F to the maximum value of the frequency f within the range that satisfies the condition in S13.

[0049] After completing the process of S14, the CPU 22 proceeds to S15 and controls the compressor 18 based on the frequency f (maximum value) obtained in S14.

[0050] On the other hand, if the result of the determination in S11 is No, the CPU 22 proceeds to S16 and determines whether or not the requested frequency is lower than the first set frequency F-Fmin.

[0051] If the answer is Yes in S16, the CPU 22 proceeds to S17 to determine whether or not there is a frequency f that is lower than the frequency F of the compressor 18 at the current time and that makes the value of the background noise relational expression greater than the value of the compressor relational expression 38.

[0052] If the result of the determination in S17 is Yes, the CPU 22 proceeds to S18 and determines whether or not there is a frequency f that is greater than the larger value of the second set frequency F-Fmax and the requested frequency and is less than the first set frequency F-Fmin.

[0053] If the result of the determination in S18 is Yes, the CPU 22 proceeds to S19, where it changes the frequency F to the minimum value of the frequency f within the range that satisfies the condition in S18.

[0054] After completing the process of S19, the CPU 22 proceeds to S20 and controls the compressor 18 based on the frequency f (minimum value) obtained in S19.

[0055] When the result of the determination in S16 is No, or when the process of S15 or S20 is completed, the CPU 22 temporarily ends the process of the flowchart in Fig. 6. Note that when the frequency F of the compressor 18 at the current time and the magnitude of the requested frequency are the same, the CPU 22 determines the result of the determination in S16 as No.

[0056] As described above, when the battery control unit calculates the required frequency, the vehicle control device 40 of this embodiment obtains a frequency f (control frequency) that is applied to the compressor relational equation 38 to obtain a first sound pressure level and that is applied to the background noise relational equations 32 and 34 to obtain a second sound pressure level higher than the first sound pressure level, and controls the compressor 18 based on this frequency f. Therefore, the vehicle control device 40 can control the compressor 18 so as not to emit a sound with a sound pressure level higher than the background noise, regardless of the magnitude of the frequency of the background noise.

[0057] FIG. 5 shows a comparative example. The vehicle control device of the comparative example controls the compressor 18 without setting the first set frequency F+Fmin (F-Fmin) and the second set frequency F+Fmax (F-Fmax). For example, assume that the frequency F of the compressor 18 at the current time is Fc1. Furthermore, assume that the actual sound pressure level SL1 of the compressor 18 when the frequency of the compressor 18 is Fc1 is the sound pressure level shown in FIG. 5. In this case, the background noise recognition unit 221 may calculate the background noise relational expression based on the sound pressure level SL1 of the compressor 18. In this case, assume that the frequency of the compressor 18 at the current time is Fc1, and the required frequency is a required frequency Fcrq-1 that is higher than the frequency Fc1. In this case, the compressor control unit 222 determines that the sound pressure level of the compressor 18 at the required frequency Fcrq-1 is lower than the sound pressure level SL1. Therefore, the compressor control unit 222 rotates the compressor 18 at the required frequency Fcrq-1, and as a result, the sound pressure level of the compressor 18 becomes higher than the sound pressure level represented by the first background noise relational expression 32. When such control is performed, as the required frequency increases, the compressor control unit 222 erroneously determines that the sound pressure level of the compressor 18 at each required frequency is lower than the actual sound pressure level of the compressor 18 at each required frequency. Therefore, the compressor control unit 222 rotates the compressor 18 while gradually increasing the required frequency. Therefore, the state in which the sound pressure level of the compressor 18 is higher than the sound pressure level represented by the first background noise relational expression 32 continues.

[0058] In contrast, the vehicle control device 40 of the embodiment sets the first set frequency Fc1+Fmin when controlling the rotation of the compressor 18, as shown in FIG. 5. Furthermore, the absolute value of the difference (amount of change) between the first set frequency Fc1+Fmin and the frequency Fc1 is set to a certain degree. That is, the absolute value of Fmin is set so that the first set frequency Fc1+Fmin is greater than the frequency region of the sound pressure level SL1. Therefore, when the required frequency is a frequency Fcqr-1 that is smaller than the first set frequency Fc1+Fmin, the compressor control unit 222 does not change the frequency of the compressor 18. Also, when the required frequency is a frequency Fcqr-2 that is greater than the first set frequency Fc1+Fmin, the compressor control unit 222 determines that the sound pressure level of the compressor 18 at the required frequency Fcqr-2 is greater than the sound pressure level represented by the first background noise relational expression 32 without being affected by the sound pressure level SL1. Therefore, in this case, the compressor control unit 222 does not increase the frequency of the compressor 18 to the required frequency Fcqr-2. Therefore, in this case, the sound pressure level of the compressor 18 does not become higher than the sound pressure level represented by the first background noise relational expression 32.

[0059] Also, for example, when the frequency of the compressor 18 at the current time is the frequency F5 in FIG. 4 and the required frequency is the frequency F8, a case is assumed in which a part of the second background noise relational expression 34 changes to the disturbance part 34X due to a disturbance. In this case, if the compressor control unit 222 does not set the second set frequency F+Fmax, the compressor control unit 222 may significantly change the frequency of the compressor 18 from the frequency F5 to the frequency F8. However, in this case, when the frequency of the compressor 18 changes between the frequency F6 and the frequency F7a, the sound pressure level (first sound pressure level) of the compressor 18 becomes higher than the sound pressure level (second sound pressure level) represented by the second background noise relational expression 34. In response to this, the compressor control unit 222 of the vehicle control device 40 of this embodiment controls the compressor 18 while setting the second set frequency F+Fmax. That is, the compressor control unit 222 determines that the sound level of the compressor relational expression 38 becomes larger than the sound pressure level of the second background noise relational expression 34 at the second set frequency F+Fmax indicated by the two-dot chain line. Therefore, in this case, the vehicle control device 40 does not change the frequency of the compressor 18 from frequency F5 to frequency F8. That is, in this case, the vehicle control device 40 does not change the frequency of the compressor 18 to a value larger than frequency F6. Therefore, according to this embodiment, in such a case, it is possible to prevent the sound pressure level (first sound pressure level) of the compressor 18 from becoming larger than the sound pressure level (second sound pressure level) represented by the second background noise relational expression 34.

[0060] Although the vehicle control device according to the embodiment has been described above, the design can be appropriately modified without departing from the scope of the present invention.

[0061] The controlled object may be a device separate from the compressor 18 .

[0062] The background noise components may include elements other than the sound picked up by the sound pickup microphone 16.

[0063] The vehicle 10 may be a vehicle other than a BEV. For example, the vehicle 10 may be a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), and may be equipped with an internal combustion engine as a drive source. [Explanation of symbols]

[0064] 10 Vehicles 18 Compressor (Control object) 22 CPU (control unit) 25 Storage (recording section) 32 First background noise relation (second relation) 34 Second background noise relation (Second relation) 38 Compressor Equation (First Equation) 40 Vehicle control device Fmin First setting value Fmax 2nd setting value

Claims

1. A control unit that controls an operation of a control target provided in a vehicle; a recording unit in which a first relational expression is recorded, the first relational expression defining a relationship between a frequency and a sound pressure level of a sound generated by the controlled object when the controlled object moves; Equipped with The control unit: a control frequency that is applied to the first relational equation to obtain a predetermined first sound pressure level, and that is applied to a second relational equation that defines the relationship between the frequency and sound pressure level of background noise surrounding the controlled object to obtain a second sound pressure level higher than the first sound pressure level, and the vehicle control device operates the controlled object at the control frequency.

2. The control unit:

2. The vehicle control device according to claim 1, wherein, when the control frequency is changed, an absolute value of an amount of change in the control frequency is made larger than a predetermined first set value.

3. The control unit: The vehicle control device according to claim 2 , wherein an absolute value of the amount of change in the control frequency is set to be smaller than a second set value that is larger than the first set value.

4. The control unit:

3. The vehicle control device according to claim 1, wherein when there are a plurality of the second relational expressions, the control frequency is specified so that the first sound pressure level is lower than the second sound pressure level that is maximum when the control frequency is applied.

Images