Information prompting device

Abstract

The objective of this invention is to provide an information prompting device that improves the occupant's awareness of vehicle behavior without altering actual ride comfort. An information prompting device (100) installed in a vehicle (1) having a body supported by a suspension system (20) is configured to include a behavior detection unit (30, 40) that detects parameters related to the vehicle's behavior, a vibration waveform generation unit (110) that generates an excitation waveform, an excitation unit (170) that uses the excitation waveform to excite at least one of the air surrounding the occupant and components in contact with the occupant, and a gain adjustment unit (130) that increases the output gain of the excitation waveform in response to an increase in parameters.

Description

Technical Field

[0001] This invention relates to an information prompting device that conveys information related to the behavior of a vehicle to the occupants of the vehicle. Background Technology

[0002] As a technology related to providing information to vehicle occupants such as drivers, for example, Patent Document 1 describes a vehicle seat that, in order to provide reliable information prompts without causing discomfort or disharmony to the driver, matches at least one of the vibration frequency, vibration prompt time, vibration amplitude, and prompt time interval of multiple oscillators with the tactile sensory characteristics of a person to the stimulus caused by the applied vibration, and in a manner that allows the driver to perceive apparent motion, vibrates multiple selected oscillators in a pre-set order to indicate a warning message of the detected dangerous state.

[0003] Patent document 2 describes a method for providing information prompts to users through bodily sensation, in which multiple prompting surfaces provided on the seat surface, backrest, and armrests are given vibrations that respond to Meissner and Pacinian corpora.

[0004] Patent document 3 describes a vehicle-mounted system that includes a tactile output device. This tactile output device, in order to improve the driver's awareness of the driving situation and surroundings in a continuous and intuitive way, and to more effectively improve the driver's ability to react to emergencies, determines the tactile feedback that the system should provide based on information related to the vehicle's surroundings, environment, and status, and generates tactile feedback for the driver of the vehicle.

[0005] In addition, it records tactile information about the movements of vehicles that skid or turn.

[0006] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2008-77631 Patent Document 2: Japanese Patent Application Publication No. 2019-26216 Patent Document 3: Japanese Patent Application Publication No. 2021-93175 Summary of the Invention

[0007] Technical issues An active damping system that allows the damping force characteristics of the dampers installed in the vehicle's suspension to vary the ride comfort according to the driving scenario can change the ride comfort and sport performance between comfortable and sporty modes depending on the scenario.

[0008] However, for damping characteristics that provide good ride comfort, the transmission rate of vibrations from the road surface is low, which can sometimes lead to a lack of information from the road surface for the driver. This can cause driver anxiety.

[0009] Thus, it is difficult to balance a setting that provides good ride comfort with a setting that provides good handling stability, and it is difficult to solve both at the same time when the requirements of the driver and other passengers are different.

[0010] In view of the above problems, the objective of the present invention is to provide an information prompting device that improves the occupant's awareness of vehicle behavior without changing the actual riding comfort.

[0011] Technical solution To address the aforementioned issues, one aspect of the present invention provides an information prompting device characterized in that it is installed in a vehicle having a body supported by a suspension system, the information prompting device comprising: a behavior detection unit that detects parameters related to the behavior of the vehicle body; an excitation waveform generation unit that generates an excitation waveform; an excitation unit that uses the excitation waveform to excite at least one of the air surrounding the occupant and a component in contact with the occupant; and a gain adjustment unit that increases the output gain of the excitation waveform in response to an increase in the parameters.

[0012] Therefore, by increasing the amplitude of the excitation waveform in response to an increase in parameters related to the vehicle's behavior, it is possible to make occupants perceive the vehicle's behavior through sound and vibration without changing the actual ride comfort.

[0013] Therefore, it can improve the ease of driving.

[0014] In this invention, the parameters can be configured to include parameters related to at least one of the pitch rate and roll rate of the vehicle body.

[0015] Therefore, it is possible to appropriately reflect vehicle behavior in information prompts using relatively easy-to-obtain parameters.

[0016] In this invention, the vehicle can be configured such that it accommodates multiple occupants, and the excitation unit only excites a portion of the multiple occupants.

[0017] Therefore, it is possible to provide appropriate information prompts or stop providing information prompts to passengers with different requirements related to vehicle behavior control.

[0018] In this invention, the excitation waveform can be configured such that it has a dominant frequency contained in a frequency band of 100 to 400 Hz.

[0019] Therefore, by using devices such as Pacinian bodies, which have high sensitivity in both the audible and tactile domains, the occupant's sound-based perception and tactile cognition become better. This allows for more reliable communication of information to the occupant.

[0020] Here, it is even more preferable to set the main frequency in the frequency band of 150 to 300 Hz, thereby enabling the use of a region with better receptor sensitivity and promoting the above-mentioned effects.

[0021] In this invention, the gain adjustment unit can be configured to set the output gain in such a way that the sound pressure generated by the excitation of the excitation unit is not prominent at the ears of at least one occupant relative to the background noise when the vehicle is in motion.

[0022] Therefore, since the sound generated by the vibration of the excitation unit is buried in the background noise of the vehicle, it is possible to prevent the passengers from feeling the harshness and to convey information appropriately.

[0023] Technical effect As described above, according to the present invention, it is possible to provide an information prompting device that improves the occupant's awareness of vehicle behavior without changing the actual riding comfort. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the structure of a vehicle equipped with an embodiment of the information display device applied to this invention.

[0025] Figure 2 This is a diagram schematically illustrating the system structure of the information prompting device according to the first embodiment.

[0026] Figure 3 This is a diagram schematically illustrating an example of an excitation waveform in the first embodiment.

[0027] Figure 4 It is a diagram schematically showing the timing of the electrical impulses emitted by the receptor when stimulated.

[0028] Figure 5 This is a graph showing the sensitivity distribution of Pacinian bodies and Meissner bodies relative to frequency.

[0029] Figure 6 This is a diagram schematically illustrating an example of gain adjustment in the first gain adjustment section.

[0030] Figure 7 This is a diagram that schematically illustrates one example of the microphone's output history.

[0031] Figure 8 This is a graph illustrating an example of the correlation between sound pressure level and frequency of background noise.

[0032] Figure 9 This is a diagram schematically illustrating an example of gain adjustment in the second gain adjustment section.

[0033] Figure 10 This diagram schematically illustrates the configuration inside the passenger compartment of a vehicle equipped with the information display device of the first embodiment.

[0034] Figure 11 It is a graph showing the correlation between the vehicle's roll rate and the driver's head movements.

[0035] Symbol Explanation D: Driver 1: Vehicle FWR: Right front wheel FWL: Front left wheel RWR: Right Rear Wheel RWL: Left rear wheel 10FR: Right front housing 10FL: Front left housing 10RR: Right rear housing 10RL: Left rear shell 20FR: Right front suspension 20FL: Front left suspension 20RR: Right rear suspension 20RL: Left rear suspension 30: Tilt rate sensor 40: Pitch rate sensor 100: Information Prompt Device 110: Waveform Generation Unit 120: Behavioral Detection Department 130: First gain adjustment section 140: Microphone 150: Sensing value calculation unit 160: Second gain adjustment section 170 (170FR, 170FL, 170RR, 170RL): Speaker 200: Carriage 210: Driver's Seat 220: Passenger seat 230: Back Seat 240: Dashboard Detailed Implementation

[0036] <First Implementation Method> The first embodiment of the information prompting device using the present invention will be described below.

[0037] The information prompting device of the first embodiment is provided, for example, in a passenger car or other automobile, and prompts the occupant (typically the driver D) with information related to the behavior of the vehicle through sound information.

[0038] Figure 1 This is a schematic diagram illustrating the structure of a vehicle equipped with an information display device according to an embodiment.

[0039] Vehicle 1 is a four-wheeled vehicle with a right front wheel FWR, a left front wheel FWL, a right rear wheel RWR, and a left rear wheel RWL.

[0040] The right front wheel FWR is mounted on the right front housing 10FR.

[0041] The left front wheel FWL is mounted on the left front housing 10FL.

[0042] The right rear wheel RWR is mounted on the right rear housing 10RR.

[0043] The left rear wheel RWL is mounted on the left rear housing 10RL.

[0044] Each housing contains a hub bearing that supports each wheel so that it can rotate.

[0045] Each housing is an unsprung component located closer to the wheel than the suspension spring and displaces relative to the vehicle body along with the wheel according to the travel of the suspension system.

[0046] The right front housing 10FR is mounted to the body via the right front suspension 20FR.

[0047] The left front housing 10FL is mounted to the body via the left front suspension 20FL.

[0048] The right rear housing 10RR is mounted to the vehicle body via the right rear suspension 20RR.

[0049] The left rear housing 10RL is mounted on the vehicle body via the left rear suspension 20RL.

[0050] Each suspension has a suspension spring that generates spring reaction force according to the travel, and a damper (shock absorber) that generates damping force according to the travel speed.

[0051] A damper is a variable damping damper whose damping force characteristics change in response to commands from a control device (not shown).

[0052] In addition, vehicle 1 is equipped with a roll rate sensor 30 and a pitch rate sensor 40.

[0053] The roll rate sensor 30 is a sensor such as a vibration gyroscope sensor that detects the angular velocity of the roll behavior of the vehicle body 1.

[0054] Roll behavior refers to the behavior in which the front and rear suspensions move in the same direction while the left and right suspensions move in the opposite direction (left and right swaying behavior).

[0055] The pitch rate sensor 40 is a sensor such as a vibration gyroscope that detects the angular velocity of the pitch behavior of the vehicle body 1.

[0056] Pitch behavior refers to the behavior in which the front and rear suspensions move in opposite directions while the left and right suspensions move in the same direction (sway behavior).

[0057] The information prompting device 100 of the first embodiment provides the driver D in the carriage with information reflecting the vehicle's roll and pitch behavior as audible information.

[0058] Figure 2 This is a diagram schematically illustrating the system structure of the information prompting device according to the first embodiment.

[0059] The information prompting device 100 vibrates the air around the occupant's ears by using a speaker 170 located in the passenger compartment, and notifies the occupant of information reflecting the vehicle's behavior through sound signals.

[0060] The information prompting device 100 includes a waveform generation unit 110, a behavior detection unit 120, a first gain adjustment unit 130, a microphone 140, a sense value calculation unit 150, a second gain adjustment unit 160, a speaker 170, etc.

[0061] The waveform generation unit 110 generates an excitation waveform, which is the waveform of the sound signal generated by the loudspeaker 170.

[0062] Figure 3 This is a diagram schematically illustrating an example of an excitation waveform in the first embodiment.

[0063] exist Figure 3 In the diagram, the horizontal axis represents time, and the vertical axis represents voltage (amplitude).

[0064] For example, Figure 3 As shown in (a), the excitation waveform can be set to a sine wave.

[0065] In addition, for example, Figure 3 As shown in (b), the excitation waveform can be set to a waveform formed by overlapping (combining) multiple sine waves with different wavelengths.

[0066] In addition, the excitation waveform is not limited to these waveforms and can be modified appropriately.

[0067] For example, as an excitation waveform, various waveforms such as rectangular waves, triangular waves, and waveforms simulating the sound of a vehicle can be used alone, or various waveforms such as rectangular waves, triangular waves, and waveforms simulating the sound of a vehicle can be combined with other waveforms for use.

[0068] In the first embodiment, the frequency of the excitation waveform can be set to, for example, 100 to 400 Hz, and more preferably, to have a dominant frequency in the range of 150 to 300 Hz.

[0069] The reasons for this will be explained below.

[0070] As sensory receptors that sense vibrations when the air around the occupants is agitated, there are Merkel cells, Meissner bodies, Pacinian bodies, and others.

[0071] Figure 4 It is a diagram schematically showing the timing of the electrical impulses emitted by the receptor when stimulated.

[0072] exist Figure 4 In the diagram, the horizontal axis represents time, and the vertical axis, from top to bottom, represents pressure, as well as the electrical impulse generation status of Merkel cells, Meissner bodies, and Pacinian bodies.

[0073] Merkel cells respond relatively slowly, corresponding to the DC component.

[0074] Meissner bodies correspond to the moment when the rate of change (velocity) of contact pressure occurs.

[0075] Pacinian bodies correspond to instantaneous changes and are the most sensitive of these receptors.

[0076] As a receptor that allows occupants to perceive minute vibrations as a combination of auditory and tactile information, the Pacinian body is considered to have the best sensitivity.

[0077] Figure 5 This is a graph showing the sensitivity distribution of Pacinian bodies and Meissner bodies relative to frequency.

[0078] exist Figure 5 In the diagram, the horizontal axis represents frequency, the vertical axis represents amplitude at the threshold, and it shows the case where a smaller value results in better sensitivity.

[0079] like Figure 5 As shown, the Pacinian body exhibits good sensitivity in the region of 100 to 400 Hz, and even better sensitivity in the 150 to 300 Hz range.

[0080] This region is contained in the 20Hz to 20kHz range, which is typically defined as the human audible range.

[0081] As an example, the main frequency of the excitation waveform can be set to 250Hz.

[0082] The behavior detection unit 120 detects the roll rate (angular velocity of roll behavior) and pitch rate (angular velocity of pitch behavior) of the vehicle body 1 based on the output of the roll rate sensor 30 and the pitch rate sensor 40.

[0083] The behavior detection unit 120 transmits the detected roll rate and pitch rate to the first gain adjustment unit 130 in sequence.

[0084] The first gain adjustment unit 130 performs the following first gain adjustment on the fundamental wave of the excitation waveform generated by the waveform generation unit 110.

[0085] The first gain adjustment is based on the detected roll and pitch rates, adjusting the output gain (gain G1) multiplied by the voltage of the excitation waveform.

[0086] Figure 6 This is a diagram schematically illustrating an example of gain adjustment in the first gain adjustment section.

[0087] exist Figure 6 In the diagram, the horizontal axis represents the absolute value of the roll or pitch rate, and the vertical axis represents the gain G1 multiplied by the voltage of the excitation waveform.

[0088] The gain G1 can be configured to increase in response to an increase in the roll rate and pitch rate.

[0089] Furthermore, the rate of increase of the gain G1 in the first gain adjustment unit 130 relative to the increase of the roll rate and pitch rate can be configured to be maximum in the region where the absolute values ​​of the roll rate and pitch rate are small, and decrease in response to the increase of the absolute values ​​of the roll rate and pitch rate.

[0090] For example, the gain G1 in the first gain adjustment unit 130 can be calculated using a logarithmic function based on the absolute values ​​of the roll rate and pitch rate.

[0091] The gain G1 can be represented, for example, by the following equation 1.

[0092] Gain G1 = log (absolute values ​​of roll rate and pitch rate × coefficient k) (Equation 1) The coefficient k can be set to a value that matches the characteristics of the vehicle, for example, during the vehicle's development phase.

[0093] Microphone 140 is a sound collection device installed inside the carriage to collect background noise inside the carriage.

[0094] The microphone 140 is preferably positioned near the occupant's ear, for example, it can be configured to be located in the headrest of the seat.

[0095] The output of the microphone 140 is transmitted to the sensing value processing unit 150.

[0096] The sensing value calculation unit 150 extracts components of a predetermined frequency band from the background noise of the vehicle acquired by the microphone 140, and transmits the sound pressure of the extracted components as sensing values ​​to the second gain adjustment unit 160.

[0097] Figure 7 This is a diagram that schematically illustrates one example of the microphone's output history.

[0098] exist Figure 7 In the diagram, the horizontal axis represents time, and the vertical axis represents the sound pressure level of the background noise acquired by the microphone 140.

[0099] The sensing value processing unit 150 performs Fast Fourier Transform (FFT) processing on the background noise sound signal acquired by the microphone 140 to convert it into the frequency domain, and further performs bandpass filtering processing to extract the components of the predetermined frequency band.

[0100] The extracted frequency band is set to include the main frequency of the excitation waveform output by the waveform generation unit 110.

[0101] The sensing value calculation unit 150 sets the average sound pressure of the extracted frequency band as the sensing value used in the second gain adjustment.

[0102] Figure 8 This is a graph illustrating an example of the correlation between sound pressure level and frequency of background noise.

[0103] exist Figure 8 In the diagram, the horizontal axis represents frequency, and the vertical axis represents sound pressure.

[0104] The bandpass filter can be configured to be located in the frequency band near the main frequency (for example, 250Hz) of the excitation waveform in the waveform generation unit 110.

[0105] The sound pressure in the extracted frequency band (as an example, the average value of the frequency band) is provided as a sensing value to the second gain adjustment unit 160.

[0106] The second gain adjustment unit 160 further adjusts the excitation waveform after the first gain adjustment, as described below.

[0107] Since the second gain adjustment adjusts the output amplitude of the excitation waveform in response to changes in background noise (drive system noise, aerodynamic noise, road noise, etc.) when the vehicle is in motion, the gain of the excitation waveform changes according to the sensed value of the noise inside the vehicle.

[0108] The second gain adjustment unit 160 performs a second gain adjustment based on the output of the sensed value calculation unit 150.

[0109] The second gain adjustment unit 160 sets the gain G2 based on the sensing value output by the sensing value calculation unit 150.

[0110] Figure 9 This is a diagram schematically illustrating an example of gain adjustment in the second gain adjustment section.

[0111] exist Figure 9 In the diagram, the horizontal axis represents the sensed value, and the vertical axis represents the gain G2 multiplied by the voltage of the excitation waveform.

[0112] The gain G2 can be configured to increase as the sensed value increases.

[0113] The gain G2 is set in such a way that the sound pressure level of the sound based on the excitation amplitude output from the speaker 170 is not prominent relative to the sound pressure level of the background noise at the occupant's ear.

[0114] Preferably, the gain G2 can be set in such a way that the sound based on the excitation amplitude is mixed into the background noise of the vehicle and becomes a sound pressure level that the occupants can hear unconsciously.

[0115] The output value (voltage) A of the excitation waveform after the first gain adjustment and the second gain adjustment described above is shown in Equation 2.

[0116] Output value A = Waveform generation unit output value × Gain G1 × Gain G2 = Output value of waveform generation unit × log (absolute value of roll rate and pitch rate × coefficient k) × gain G2 (Equation 2) The loudspeaker 170 is a vibration device installed inside the carriage and uses an output value A to vibrate the air around the occupants inside the carriage to produce sound.

[0117] The configuration of speaker 170 will be explained in detail later.

[0118] The speaker 170 can be configured, for example, to be shared with speakers used for sound reproduction in vehicle audio devices, etc.

[0119] In addition, the information display device 100 may be equipped with a dedicated speaker 170.

[0120] Figure 10 This diagram schematically illustrates the configuration inside the passenger compartment of a vehicle equipped with the information display device of the first embodiment.

[0121] The interior of the carriage 200 includes a driver's seat 210, a passenger seat 220, a rear seat 230, and an instrument panel 240.

[0122] The driver's seat 210 and the passenger seat 220 are the front seats located at the front of the passenger compartment.

[0123] The driver's seat 210 and the passenger seat 220 are arranged side by side along the width of the vehicle.

[0124] exist Figure 10 In the example shown, the vehicle is a so-called right-hand drive vehicle, with the driver's seat 210 located on the right side and the passenger seat 220 located on the left side relative to the left and right center of the vehicle body.

[0125] The driver's seat 210 and the passenger seat 220 each have a seat cushion for the occupant's buttocks and thighs, a seat backrest positioned behind the occupant's back, and a headrest positioned behind the occupant's head.

[0126] The rear seat 230 is a long, narrow seat located behind the driver's seat 210 and the front passenger seat 220.

[0127] The rear seat 230 can accommodate, for example, two passengers sitting side by side.

[0128] The rear seat 230 has a seat cushion for the occupant's buttocks and thighs, a seat backrest positioned behind the occupant's back, and a headrest positioned behind the occupant's head.

[0129] The right-side seating area of ​​the rear seat 230 is located behind the driver's seat 210, and the left-side seating area is located behind the front passenger seat 220.

[0130] The instrument panel 240 is a component located near the front end of the passenger compartment 200 and housing components such as an instrument panel, ventilation, air conditioning and heating system, and infotainment system.

[0131] The dashboard 240 is configured to face the occupants seated in the driver's seat 210 and the front passenger seat 220.

[0132] exist Figure 10 In the example shown, there are, for example, four speakers 170 arranged separately in the front, rear, left, and right sides of the carriage 200.

[0133] The following explanation will be provided by adding suffixes corresponding to the positions of the symbols for each speaker 170.

[0134] The front right speaker 170FR is located near the right end of the instrument panel 240.

[0135] Speaker 170FR is a directional speaker directed toward the head (ear) of the occupant seated in the driver's seat 210.

[0136] The front left speaker 170FL is located near the left end of the dashboard 240.

[0137] The speaker 170FL is a directional speaker directed toward the head (ear) of the occupant seated in the front passenger seat 220.

[0138] The speaker 170RR is located on the right rear headrest of the driver's seat 210.

[0139] The speaker 170RR is a directional speaker directed toward the head (ear) of the occupant seated on the right side of the rear seat 230.

[0140] The left rear speaker 170RL is located in the headrest of the passenger seat 220.

[0141] Speaker 170RL is a directional speaker directed toward the head (ear) of the occupant seated on the left side of the rear seat 230.

[0142] The information prompting device 100 can be configured, for example, to selectively convey audible information corresponding to the behavior of the vehicle body to a portion of the occupants inside the vehicle compartment.

[0143] For example, the information prompting device 100 can be configured to use only the right front speaker 170FR to provide information to the driver D seated in the driver's seat 210.

[0144] Therefore, it is possible to effectively provide information related to the vehicle's behavior to the driver D without altering the perceived ride comfort of passengers other than the driver D.

[0145] The effects of the information display device according to the first embodiment will be explained below.

[0146] Figure 11 It is a graph showing the correlation between the vehicle's roll rate and the driver's head movements.

[0147] exist Figure 11 In the diagram, the horizontal axis represents the vehicle's roll rate, and the vertical axis represents the driver's head movements.

[0148] In addition, in the graph, data with information prompts are plotted with black dots, while data without information prompts are plotted with gray dots.

[0149] like Figure 11 As shown, by providing information prompts, the occupant's head movements are suppressed, which can improve the predictability of the vehicle's behavior related to the occupant.

[0150] According to the first embodiment described above, the following effects can be obtained.

[0151] (1) By increasing the amplitude of the excitation waveform in response to the increase of parameters related to the behavior of the vehicle body, it is possible to enable occupants such as driver D to perceive the behavior of the vehicle body through sound without changing the actual ride comfort of the vehicle.

[0152] Therefore, it can improve the ease of driving.

[0153] (2) By using the pitch and roll rates of the vehicle body as parameters related to the behavior of the vehicle body, it is possible to appropriately reflect the vehicle behavior in the information prompts using relatively easy-to-obtain parameters.

[0154] (3) In order to provide information to the driver D who is seated in the driver's seat 210, the information is provided by using only the right front speaker 170FR. This allows for appropriate information provision to the driver D, who has high requirements for vehicle control, and also prevents the impression of reduced ride comfort from being given to other passengers.

[0155] (4) The excitation waveform has a dominant frequency contained in the frequency band of 100 to 400 Hz, which allows the use of Pacinian bodies, which have high sensitivity in the audible range and high sensitivity in terms of skin sensation, thus improving the occupant's sound-based perception and skin sensation cognition. Therefore, information can be conveyed to the occupant more reliably.

[0156] (5) By adjusting the gain so that the sound pressure generated by the loudspeaker is not prominent at the occupant’s ears relative to the background noise when the vehicle is in motion, it is possible to prevent the occupant from feeling harsh and to convey information appropriately.

[0157] <Second Implementation Method> Next, a second embodiment of the information prompting device of the present invention will be described.

[0158] The same symbols are used to mark the same parts as in the first embodiment described above, and the descriptions are omitted. The main focus is on the differences.

[0159] The information prompting device of the second embodiment directly vibrates driving operation components that come into contact with the occupant's body, such as seats and steering wheels, to transmit vibrations and prompt information to the occupant, thereby replacing the speaker 170 of the first embodiment.

[0160] In the second embodiment described above, the same effect as that of the first embodiment can also be obtained.

[0161] (Modified example) This invention is not limited to the embodiments described above, and various modifications and alterations are possible, which are also within the technical scope of this invention.

[0162] (1) The structure of the information prompting device and the vehicle is not limited to the above embodiments and can be modified appropriately.

[0163] For example, the hardware structure of the information prompting device and the specific method for adjusting the gain of the excitation waveform are not limited to the structure of each implementation and can be appropriately modified.

[0164] (2) In each embodiment, the roll rate and pitch rate of the vehicle body are used as parameters related to the behavior of the vehicle, but the parameters are not limited to these and can be changed appropriately.

Claims

1. An information prompting device, characterized in that, It is installed in vehicles with a body supported by a suspension system. The information prompting device includes: The behavior detection unit detects parameters related to the behavior of the vehicle body. The excitation waveform generation unit generates the excitation waveform; The excitation unit uses the excitation waveform to excite at least one of the air surrounding the occupant and the components in contact with the occupant; as well as The gain adjustment unit increases the output gain of the excitation waveform in response to an increase in the parameter.

2. The information prompting device according to claim 1, characterized in that, The parameters include those related to at least one of the pitch rate and roll rate of the vehicle body.

3. The information prompting device according to claim 1 or 2, characterized in that, The vehicle is designed to accommodate multiple passengers. The excitation unit only excites a portion of the multiple occupants.

4. The information prompting device according to claim 1 or 2, characterized in that, The excitation waveform has a dominant frequency contained in a frequency band of 100 to 400 Hz.

5. The information prompting device according to claim 1 or 2, characterized in that, The gain adjustment unit sets the output gain in such a way that the sound pressure generated by the excitation of the excitation unit is not prominent at the ears of at least one occupant relative to the background noise when the vehicle is in motion.

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