Vehicle filter regeneration control device

Abstract

The present invention provides a vehicle filter regeneration control device that can suppress the feeling of discomfort or unease experienced by the driver or passengers by performing filter regeneration control. [Solution] A vehicle filter regeneration control device for restoring the collection capacity of a filter that collects particulate matter contained in engine exhaust, wherein when the amount of particulate matter deposited in the filter is greater than or equal to a predetermined amount (Yes in step S1) and the sound pressure level inside the vehicle is greater than or equal to a predetermined level (Yes in step S2), the device performs filter regeneration control including a warm-up operation to raise the temperature of the filter by increasing the exhaust temperature of the engine and a regeneration operation to supply oxygen to the filter via the engine (step S3).

Description

Technical Field

[0001] This invention relates to a filter regeneration control device for restoring the collection performance of a filter for purifying engine exhaust.

Background Art

[0002] Patent Document 1 describes a hybrid vehicle configured to be capable of EV travel by another motor with an engine as a driving force source and two motors, with the engine and one of the motors disconnected from the drive wheels. A control device for regenerating a filter for collecting particulate matter contained in the exhaust of the engine is described. The regeneration control device described in this Patent Document 1 is a control for supplying oxygen to the filter in a warm-up state to burn the particulate matter deposited on the filter and regenerate the filter, which is executed by motoring the engine with one of the motors during EV travel. Therefore, in order to suppress the noise associated with an increase in engine speed, the regeneration control described in Patent Document 1 sets the motoring speed in the regeneration control lower when the regeneration control is executed in a non-noisy area such as a residential area than when it is executed in a noisy area such as an industrial area or a daytime urban area. Further, since the filter is regenerated by motoring the engine with one of the motors as described above, when it is predicted that the remaining charge of the power source that supplies power to the motor at the time when the regeneration control of the filter is completed will be equal to or greater than a predetermined value, the regeneration control of the filter is executed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The filter regeneration control described in Patent Document 1 sets the motoring speed for filter regeneration control according to the vehicle's driving environment. Therefore, when filter regeneration control is performed in a noisy area, the motoring speed is set to a relatively high speed, and the engine rotates at a relatively high speed, generating a relatively loud noise inside the vehicle. As a result, the driver and passengers may experience discomfort or unease.

[0005] This invention was made in view of the above-mentioned technical problems, and aims to provide a vehicle filter regeneration control device that can suppress the feeling of discomfort or unease experienced by the driver or passengers by performing filter regeneration control. [Means for solving the problem]

[0006] To achieve the above objective, this invention provides a vehicle filter regeneration control device for restoring the collection capacity of a filter that collects particulate matter contained in engine exhaust, comprising a controller for controlling the engine, the controller comprising: a deposit amount determination unit that determines whether the amount of particulate matter deposited in the filter is equal to or greater than a predetermined amount; a driving condition determination unit that determines, when the deposit amount determination unit determines that the amount of particulate matter deposited is equal to or greater than the predetermined amount, that the driving conditions are such that the sound pressure level inside the vehicle is equal to or greater than a predetermined level; and a regeneration control execution unit that performs filter regeneration control including a warm-up operation that increases the exhaust temperature of the engine to raise the temperature of the filter, and a regeneration operation that supplies oxygen to the filter via the engine, when the driving conditions are such that the sound pressure level is equal to or greater than the predetermined level.

[0007] Furthermore, this invention may further include a measuring instrument for measuring the sound pressure level inside the vehicle cabin, and the driving conditions may include driving conditions in which the sound pressure level inside the vehicle cabin measured by the measuring instrument is equal to or greater than the predetermined level.

[0008] Furthermore, in this invention, the driving conditions may include driving conditions in which it is estimated that the sound pressure level inside the vehicle cabin is equal to or greater than the predetermined level.

[0009] Furthermore, this invention further includes a sound generator that emits sound toward the vehicle interior, and the driving conditions may include driving conditions in which the signal input to the sound generator causes the sound pressure level inside the vehicle interior to be above a predetermined level.

[0010] Furthermore, this invention further includes a position locator that identifies the location information of the vehicle and a road surface information storage unit that stores road surface information of the vehicle's travel route. The playback control execution unit may execute the filter playback control when the vehicle is traveling for a predetermined time or longer on a road surface where it is estimated that the sound pressure level inside the vehicle cabin will be above a predetermined level, based on the location information identified by the position locator and the road surface information stored in the road surface information storage unit.

[0011] Furthermore, in this invention, the controller may further include a storage unit for storing the vehicle's driving history, a calculation unit for calculating a controllable ratio, which is the period during which the sound pressure level inside the vehicle cabin is equal to or greater than a predetermined level relative to the vehicle's driving distance or driving time, based on the driving history stored in the storage unit, and a correction unit for correcting the predetermined amount to a smaller amount the smaller the controllable ratio calculated by the calculation unit is. [Effects of the Invention]

[0012] According to this invention, when driving conditions are such that the sound pressure level inside the vehicle cabin exceeds a predetermined level, filter regeneration control is executed. As a result, the sound generated as a result of executing the filter regeneration control is masked by other sounds occurring inside the vehicle cabin. Therefore, it is possible to suppress the driver and passengers from experiencing discomfort or unease, such as feeling that the sound emanating from the vehicle has changed. [Brief explanation of the drawing]

[0013] [Figure 1]This figure illustrates an example of a vehicle equipped with an engine and filter according to an embodiment of the present invention. [Figure 2] This is a block diagram illustrating the functional configuration of the controller in an embodiment of this invention. [Figure 3] This is a flowchart illustrating an example of control performed by the filter regeneration control device in this embodiment of the invention. [Figure 4] This is a flowchart illustrating an example of filter playback control. [Figure 5] This is a flowchart illustrating another example of control performed by the filter regeneration control device in this embodiment of the invention. [Figure 6] This flowchart illustrates a control example that corrects a predetermined amount which serves as a threshold for determining whether to execute filter regeneration control. [Modes for carrying out the invention]

[0014] This invention will be described based on the embodiments shown in the figures. The embodiments described below are merely examples of how this invention can be implemented and do not limit it.

[0015] Figure 1 schematically shows an example of a vehicle Ve equipped with an engine and filter according to an embodiment of this invention. The engine 1 shown in Figure 1 is configured to generate power by burning a mixture of fuel, such as gasoline or diesel, and air, similar to conventional engines. Specifically, the engine 1 includes an engine block 3 in which a plurality of cylinders 2 for burning the mixture are formed. Each cylinder 2 is provided with a spark plug 4 for igniting the mixture.

[0016] An intake pipe 5 for taking in outside air is connected to the engine block 3 via an intake manifold 6. In addition to various members such as an air cleaner (not shown), this intake pipe 5 is provided with a throttle valve 7 for controlling the amount of air flowing in the intake pipe 5 based on the driver's accelerator operation amount and the like. The intake pipe 5 is provided with a throttle opening sensor 8 for detecting the opening degree of the throttle valve 7.

[0017] An exhaust pipe 9 for discharging the exhaust gas generated by burning the air-fuel mixture in each cylinder 2 to the outside of the vehicle is connected to the engine block 3 via an exhaust manifold 10.

[0018] This exhaust pipe 9 is provided with various devices for purifying unburned gases (carbon monoxide (CO) and hydrocarbons (HC)) and nitrogen oxides (NOx) contained in the exhaust gas, and for collecting particulate matter (PM). In the example shown in FIG. 1, the exhaust pipe 9 is provided with a catalyst device 11 such as an oxidation catalyst (two-way catalyst) or a three-way catalyst for purifying unburned gases and NOx, and downstream of the catalyst device 11, a PM collection device 12 for collecting particulate matter is provided. This PM collection device 12 corresponds to the "filter" in the embodiment of this invention.

[0019] This PM collection device 12 functions as an exhaust gas purification device. For example, it is a filter 13 called a GPF (Gasoline Particulate Filter) constituted by a wall flow type filter 13. This filter 13 can be configured in the same manner as a conventional GPF, and a plurality of pores for collecting particulate matter contained in the exhaust gas are formed while the exhaust gas passes through. In addition to the function of collecting particulate matter, the filter 13 has a function as a catalytic converter for purifying nitrogen oxides, carbon monoxide, or hydrocarbons contained in the exhaust gas by oxidation and reduction. Specifically, platinum, palladium, rhodium, etc. are coated on the wall surface of the pores. In the following description, the filter 13 is referred to as GPF13.

[0020] In addition, the vehicle Ve is provided with a crank angle sensor 14 that detects the rotational speed (or rotational angle) of the engine 1, an A / F sensor 15 that detects the oxygen concentration contained in the exhaust gas, a floor temperature sensor 16 that detects the temperature of the GPF 13, a differential pressure sensor 17 that detects the differential pressure between the upstream side and the downstream side of the GPF 13, a vehicle speed sensor 18 that detects the vehicle speed, a microphone 19 that detects the sound pressure inside the vehicle cabin, and a G sensor 20 that detects the acceleration of the vehicle Ve. This microphone 19 corresponds to the "measuring instrument" in the embodiment of this invention.

[0021] Furthermore, a navigation system 21 in which map information including road surface information of the traveling road is stored, a speaker 22 that emits sound inside the vehicle cabin, an input value detection sensor 23 that detects a signal (for example, a current value) input from another controller to the speaker 22, and a GPS receiver 24 that specifies the position information of the vehicle Ve are provided. This navigation system 21 corresponds to the "road surface information storage unit" in the embodiment of this invention, the speaker 22 corresponds to the "sound emitter" in the embodiment of this invention, and the GPS receiver 24 corresponds to the "position specifier" in the embodiment of this invention.

[0022] Based on the signals detected by the various sensors and the like described above, a controller 25 for controlling the engine 1 is provided. This controller 25 is mainly composed of a microcomputer, similar to the controller provided in a conventional vehicle, and outputs a signal for controlling the engine 1 based on the input signals and maps and arithmetic expressions stored in advance. Specifically, it calculates the amount of fuel to be injected into the engine 1, the amount of air supplied to the engine 1, or the timing of igniting the air-fuel mixture, and outputs a command signal to an injector (not shown), a throttle valve 7, or a spark plug 4.

[0023] FIG. 2 shows a block diagram for explaining the functional configuration of the controller 25. The controller 25 shown in FIG. 2 includes a deposition amount determination unit 26, a traveling condition determination unit 27, a regeneration control execution unit 28, a storage unit 29, a calculation unit 30, and a correction unit 31.

[0024] The accumulation amount determination unit 26 determines whether or not a predetermined amount or more of particulate matter has accumulated on the GPF 13. Specifically, a signal is input from the differential pressure sensor 17, and based on the input signal, it determines whether or not a predetermined amount or more of particulate matter has accumulated on the GPF 13 based on whether or not the difference between the input pressure and the output pressure of the GPF 13 is greater than a predetermined difference. Alternatively, the amount of particulate matter accumulated on the GPF 13 is accumulated based on the operating conditions of the engine 1, such as the rotational speed of the engine 1 detected by the crank angle sensor 14 and the oxygen concentration contained in the exhaust detected by the A / F sensor 15, and it determines whether or not a predetermined amount or more of particulate matter has accumulated on the GPF 13 based on whether or not the accumulated value is greater than or equal to a predetermined value.

[0025] The driving condition determination unit 27 determines whether the driving conditions are such that the sound pressure level inside the vehicle cabin is above a predetermined level. The driving condition determination unit 27 may determine whether the driving conditions are such that the sound pressure level inside the vehicle cabin is above a predetermined level by measuring the actual sound pressure level inside the vehicle cabin using the microphone 19, or it may determine whether the driving conditions are such that the sound pressure level inside the vehicle cabin, estimated based on the driving state and driving environment of the vehicle Ve, is above a predetermined level.

[0026] Specifically, if the vehicle speed detected by the vehicle speed sensor 18 is equal to or greater than a predetermined vehicle speed, it may be determined that the driving conditions are such that the sound pressure level inside the vehicle cabin is equal to or greater than a predetermined level. This is because when the vehicle Ve is in motion, driving noises such as friction noise between the wheels and the road surface, driving noises from the power transmission device including the engine 1 and the gear train (not shown), and wind noise are generated, and sounds corresponding to these driving noises are generated inside the vehicle cabin.

[0027] Alternatively, the system may determine that the sound pressure level inside the vehicle cabin is above a predetermined level when the vehicle Ve is traveling on a rough road surface. Specifically, the system may determine that the sound pressure level inside the vehicle cabin is above a predetermined level when the acceleration detected by the G sensor 20 is above a predetermined acceleration, or when the current position of the vehicle Ve detected by the GPS receiver 24 is on a rough road surface such as an uneven road stored in map information such as a navigation system.

[0028] Furthermore, the driving condition determination unit 27 may determine that the driving conditions are such that the sound pressure level inside the vehicle is above a predetermined level if the loudness (sound pressure level) of the sound emitted towards the vehicle interior is above a predetermined level. Specifically, the unit may determine that the driving conditions are such that the sound pressure level inside the vehicle is above a predetermined level if the command signal input to the speaker 22 (the value detected by the input value detection sensor 23) is above a predetermined value. The sound emitted from the speaker 22 may be music or other sounds output from audio equipment (not shown), or it may be a masking sound that simulates driving noise.

[0029] The regeneration control execution unit 28 outputs a command signal to the engine 1 to execute filter regeneration control in order to oxidize and remove particulate matter accumulated in the GPF 13 and restore the particulate matter collection capacity of the GPF 13. Specifically, the filter regeneration control performs a warm-up operation to increase the exhaust temperature of the engine 1 and raise the temperature of the GPF 13 by retarding the ignition timing of the engine 1 from top dead center (compression top dead center), and a regeneration operation to supply oxygen to the warmed-up GPF 13 via the engine 1 by stopping the fuel supply to the engine 1. That is, when the temperature detected by the floor temperature sensor 16 rises to a predetermined temperature by performing the warm-up operation, the fuel supply to the engine 1 is stopped and the system switches to regeneration operation.

[0030] The memory unit 29 stores the driving history of vehicle Ve. Specifically, it stores at least the total distance traveled, the total driving time, and the period during which the driving condition determination unit 27 determines that the sound pressure level inside the vehicle cabin is above a predetermined level.

[0031] The calculation unit 30 calculates a controllable ratio, which is the period during which the sound pressure level inside the vehicle cabin is determined to be above a predetermined level, relative to the total distance traveled or total travel time, based on the driving history stored in the memory unit 29. In other words, the calculation unit 30 estimates whether the owner of vehicle Ve drives the vehicle under conditions where the sound pressure level inside the vehicle cabin is high, or whether the owner performs driving operations that result in a high sound pressure level inside the vehicle cabin, or whether the owner uses vehicle Ve in an environment where the sound pressure level inside the vehicle cabin is high.

[0032] The correction unit 31 corrects a predetermined amount adopted by the accumulation amount determination unit 26 according to the controllable ratio calculated by the calculation unit 30. Specifically, the smaller the controllable ratio, the smaller the predetermined amount is corrected to. In addition to the above controllable ratio, or instead, the correction unit 31 may determine the rate at which particulate matter accumulates on the GPF 13 based on the detected value of the differential pressure sensor 17 and the operating state of the engine 1, and the faster the accumulation rate, the smaller the predetermined value is corrected to.

[0033] Figure 3 shows a flowchart illustrating a control example for determining whether or not to perform filter regeneration control. In the control example shown in Figure 3, first, it is determined whether or not the amount of PM accumulation is above a predetermined amount (step S1). This step S1 is performed by the accumulation amount determination unit 26. Specifically, a positive determination is made in step S1 if the difference between the input pressure and output pressure of the GPF 13 is above a predetermined difference, or if the cumulative value of the amount of particulate matter accumulated, determined based on the operating state of the engine 1, is above a predetermined value. The predetermined amount in step S1 is a threshold for determining whether or not to perform filter regeneration control, and is set to an amount less than the amount of accumulation at which the particulate matter collection function of the GPF 13 is significantly reduced.

[0034] If step S1 is negatively determined because the amount of PM accumulation is less than a predetermined amount, the GPF 13 can function normally and collect particulate matter, so this routine is terminated. Conversely, if step S1 is positively determined because the amount of PM accumulation is greater than or equal to a predetermined amount, it is determined whether the driving conditions are such that the sound pressure level inside the vehicle is above a predetermined level (step S2). This step S2 is performed by the driving condition determination unit 27. Specifically, step S2 is positively determined if the actual sound pressure level inside the vehicle measured by the microphone 19 is above a predetermined level, the vehicle speed is above a predetermined speed, the vehicle Ve is driving on a rough road surface, or the volume of sound emitted towards the vehicle is above a predetermined level. The predetermined level in step S2 is set to be higher than the level of sound generated inside the vehicle by executing filter regeneration control. In other words, step S2 determines whether the sound generated as a result of executing filter regeneration control can be masked by the sound generated inside the vehicle.

[0035] If step S2 is negatively determined because the driving conditions do not result in a sound pressure level inside the vehicle being above a predetermined level, the routine is terminated without executing the filter regeneration control, as the resulting noise would cause discomfort or unease to the driver and passengers. Conversely, if step S2 is positively determined because the driving conditions result in a sound pressure level inside the vehicle being above a predetermined level, the filter regeneration control is executed (step S3), and the routine is terminated.

[0036] Figure 4 shows a flowchart illustrating an example of the filter regeneration control described above. In this example, the GPF13 is first heated (step S31). Specifically, the GPF13 is heated by the exhaust of engine 1 by retarding the ignition timing, thereby increasing the exhaust temperature of engine 1. Step S31 corresponds to "warm-up operation" in this embodiment of the invention.

[0037] Next, it is determined whether the temperature of the GPF13 is above a predetermined temperature (step S32). Step S32 is a step to determine whether the temperature has reached a point where the accumulated particulate matter can be oxidized and removed by supplying oxygen to the GPF13, and this determination can be made based on the temperature detected by the floor temperature sensor 16. Therefore, if it is determined negatively in step S32 because the temperature of the GPF13 is below the predetermined temperature, the process returns to step S31. In other words, steps S31 and S32 are repeatedly executed until the temperature of the GPF13 reaches or exceeds the predetermined temperature.

[0038] Conversely, if it is determined in step S32 that the temperature of GPF13 is above a predetermined temperature, oxygen is supplied to GPF13 (step S33). Specifically, air is allowed to flow to GPF13 via engine 1 by performing a fuel cut, which stops the supply of fuel to engine 1. Step S33 is performed continuously, for example, until the difference between the input pressure and output pressure of GPF13 decreases to a degree that can be determined to have removed the particulate matter accumulated on GPF13, or for a predetermined period of time that allows the particulate matter accumulated on GPF13 to be removed. After that, this routine is terminated.

[0039] As described above, when driving conditions are such that the sound pressure level inside the vehicle exceeds a predetermined level, filter regeneration control is executed, and the sound generated as a result of executing the filter regeneration control is masked by other sounds occurring inside the vehicle. Therefore, it is possible to suppress the driver and passengers from feeling any discomfort or unease, such as perceiving a change in the sound emanating from the vehicle Ve.

[0040] Figure 5 shows a flowchart illustrating a control example configured to execute filter regeneration control when it is predicted that filter regeneration control will be completed during a period of driving conditions in which the sound pressure level inside the vehicle cabin exceeds a predetermined level. Steps identical to those in the control example shown in Figure 3 are denoted by the same reference numerals and their explanations are omitted.

[0041] In the control example shown in Figure 5, if a positive result is obtained in step S2, a decision is made based on the position of the vehicle Ve detected by the GPS receiver 24 and the road surface information stored in the navigation system 21 to determine whether or not to continue driving on a road surface where the sound pressure level inside the vehicle cabin is above a predetermined level for a predetermined time or longer (step S5). The predetermined time in step S5 can be set to be longer than the time required for filter regeneration control.

[0042] Then, if it is determined positively in step S5 that the vehicle has been driving on a road surface where the sound pressure level inside the vehicle is above a predetermined level for a predetermined time or longer, the vehicle will proceed to step S3 and execute the filter regeneration control, as the sound pressure level inside the vehicle will not fall below the predetermined level during the process of executing the filter regeneration control. Conversely, if it is determined negatively in step S5 that the vehicle has not been driving on a road surface where the sound pressure level inside the vehicle is above a predetermined level for a predetermined time or longer, the filter regeneration control will not be executed, and this routine will be terminated.

[0043] As described above, if it is predicted that filter regeneration control will be completed during a period of driving conditions in which the sound pressure level inside the vehicle cabin is above a predetermined level, executing filter regeneration control can prevent the sound pressure level inside the vehicle cabin from falling below the predetermined level before the filter regeneration control is completed. As a result, it is possible to prevent the driver or passengers from noticing the sound generated by executing filter regeneration control and experiencing discomfort or unease.

[0044] As shown in the control examples in Figures 3 and 5 above, filter regeneration control is performed when driving conditions are such that the sound pressure level inside the vehicle exceeds a predetermined level. Depending on the driving conditions, driving environment, or the user's driving style, the opportunities for filter regeneration control to be performed may be limited. Therefore, by referring to the driving history, the predetermined amount in step S1 may be corrected according to the frequency of occurrence of driving conditions in which the sound pressure level inside the vehicle exceeds a predetermined level. Figure 6 shows a flowchart illustrating an example of this control.

[0045] In the control example shown in Figure 6, the first step is to read the driving history of vehicle Ve (step S61). Step S6 only requires reading the driving history stored in the memory unit 29, and therefore reads the total driving distance, total driving time, and the period during which the driving condition determination unit 27 has determined that the sound pressure level inside the vehicle cabin is above a predetermined level.

[0046] Next, based on the driving history read in step S61, the controllable ratio is calculated (step S62). This step S62 is performed by the calculation unit 30. Specifically, based on the driving history read in step S62, the controllable ratio is calculated, which is the period during which driving conditions are determined to be such that the sound pressure level inside the vehicle cabin is above a predetermined level, relative to the total driving distance or total driving time.

[0047] Then, based on the controllable ratio calculated in step S62, the amount of particulate matter deposited (a predetermined amount in Figures 3 and 5), which serves as the threshold for executing filter regeneration control, is corrected (step S63), and this routine is terminated. Specifically, the smaller the controllable ratio calculated in step S62, the smaller the predetermined amount is corrected to. In other words, if the sound pressure level inside the vehicle cabin remains relatively low for a long period, there are fewer opportunities to execute filter regeneration control, so filter regeneration control is made possible from the point when the amount of particulate matter deposited on the GPF13 is small.

[0048] As described above, by correcting the threshold for executing filter regeneration control according to the controllable ratio, filter regeneration control can be executed on those limited opportunities, even if the frequency of driving conditions in which the sound pressure level inside the vehicle exceeds a predetermined level is low. As a result, it is possible to suppress the execution of filter regeneration control when the sound pressure level inside the vehicle is below a predetermined level, thereby suppressing discomfort or unease experienced by the driver and passengers.

[0049] Furthermore, the vehicle in this embodiment of the invention only needs to be equipped with an engine, and that engine is not limited to a gasoline engine, but may also be a diesel engine. In addition to the engine, it may also be a hybrid vehicle equipped with a motor as a driving force source. Moreover, filter regeneration control may be performed when the sound pressure level inside the vehicle cabin is above a predetermined level under driving conditions, and for example, in addition to the driving conditions where the sound pressure level inside the vehicle cabin is above a predetermined level, filter regeneration control may also be performed when other factors are met, such as driving in a noisy area such as a factory area or an urban area during the daytime. [Explanation of Symbols]

[0050] 1 Engine 9 Exhaust pipe 12 Collection device 13. Filter (GPF) 14. Crank angle sensor 15 A / F sensor 16. Floor temperature sensor 17 Differential pressure sensor 18. Vehicle speed sensor 19 Microphone 20 G sensor 21 Navigation System 22 speakers 23 Input Value Detection Sensor 24 GPS receivers 25 Controllers 26 Deposition amount determination section 27 Driving Condition Determination Unit 28 Playback control execution unit 29 Memory section 30 Calculation Section 31 Correction section Vehicle

Claims

1. A vehicle filter regeneration control device that restores the collection capacity of a filter that collects particulate matter contained in engine exhaust, The engine is equipped with a controller that controls the engine, The aforementioned controller, A deposit amount determination unit that determines whether the amount of particulate matter deposited in the filter is equal to or greater than a predetermined amount, When the accumulation amount determination unit determines that the amount of particulate matter accumulated is equal to or greater than the predetermined amount, the driving condition determination unit determines that the sound pressure level inside the vehicle is equal to or greater than a predetermined level. The system includes a regeneration control execution unit that performs filter regeneration control, which includes a warm-up operation to increase the exhaust temperature of the engine and raise the temperature of the filter, and a regeneration operation to supply oxygen to the filter via the engine, when the sound pressure level is above a predetermined level under driving conditions. A vehicle filter regeneration control device characterized by the following features.

2. A filter regeneration control device for a vehicle according to claim 1, The vehicle further comprises a measuring instrument for measuring the sound pressure level inside the vehicle cabin, The aforementioned driving conditions include driving conditions in which the sound pressure level inside the vehicle, as measured by the measuring instrument, is equal to or greater than the predetermined level. A vehicle filter regeneration control device characterized by the following features.

3. A filter regeneration control device for a vehicle according to claim 1, The aforementioned driving conditions include driving conditions under which it is estimated that the sound pressure level inside the vehicle cabin will be equal to or greater than the predetermined level. A vehicle filter regeneration control device characterized by the following features.

4. A filter regeneration control device for a vehicle according to claim 1, The vehicle is further equipped with a sound-emitting device that emits sound towards the interior of the vehicle. The aforementioned driving conditions include driving conditions in which the signal input to the sound generator causes the sound pressure level inside the vehicle to be equal to or greater than the predetermined level. A vehicle filter regeneration control device characterized by the following features.

5. A filter regeneration control device for a vehicle according to claim 1, A location locator that identifies the location information of the aforementioned vehicle, The vehicle further comprises a road surface information storage unit that stores road surface information of the vehicle's travel path, The playback control execution unit executes the filter playback control when the vehicle is driving for a predetermined time or longer on a road surface where it is estimated that the sound pressure level inside the vehicle cabin will be above a predetermined level, based on the location information identified by the location identifier and the road surface information stored in the road surface information storage unit. A vehicle filter regeneration control device characterized by the following features.

6. A filter regeneration control device for a vehicle according to claim 1, The aforementioned controller, A storage unit for storing the vehicle's driving history, A calculation unit calculates a controllable ratio, which is the period during which the sound pressure level inside the vehicle cabin is equal to or greater than the predetermined level, based on the driving history stored in the memory unit, and is a ratio of the driving distance of the vehicle or the driving time of the vehicle. The system further includes a correction unit that corrects the predetermined amount to a smaller amount if the controllable ratio calculated by the calculation unit is small. A vehicle filter regeneration control device characterized by the following features.

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