CN112298081A - Adding desired electric vehicle command sounds through passive mechanical systems - Google Patents
Adding desired electric vehicle command sounds through passive mechanical systems Download PDFInfo
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- CN112298081A CN112298081A CN202010724489.2A CN202010724489A CN112298081A CN 112298081 A CN112298081 A CN 112298081A CN 202010724489 A CN202010724489 A CN 202010724489A CN 112298081 A CN112298081 A CN 112298081A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/037—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for occupant comfort, e.g. for automatic adjustment of appliances according to personal settings, e.g. seats, mirrors, steering wheel
- B60R16/0373—Voice control
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Abstract
The invention relates to adding desired electric vehicle command sounds through a passive mechanical system. An auditory feedback system for an electrically powered vehicle is provided. The auditory feedback system comprises: a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm; a body for the electrically powered vehicle; and a selectively engageable ground connection. The selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when the drive unit output torque exceeds a threshold output torque.
Description
Technical Field
The present disclosure relates generally to improving driver experience in electric vehicles.
Background
A driver of a vehicle powered by a combustion engine may be accustomed to experiencing certain sound or audio feedback while driving the vehicle. For example, when the accelerator pedal is depressed to indicate an intention to accelerate the vehicle, the driver may be accustomed to hearing an increase in the speed and volume of the engine, particularly in the lower audio frequency band associated with booming or roaring sounds.
An electric vehicle or a vehicle that derives propulsion power from one or more electric machines may not provide sound similar to a combustion engine when powering the vehicle. Electric vehicles may accelerate rapidly, with an associated electric motor sharply increasing the torque applied to the output shaft, with little or no perceptible audio feedback being provided to the driver to indicate operation of the electric motor.
Disclosure of Invention
An auditory feedback system for an electrically powered vehicle is provided. The auditory feedback system comprises: a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm; a body for the electrically powered vehicle; and a selectively joined ground out connection. The selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when the drive unit output torque exceeds a threshold output torque.
In some embodiments, the selectively engageable ground connection is a stand-alone ground connection unit.
In some embodiments, the system further includes a drive unit mounting bracket, and the selectively engageable ground connection is embedded within the drive unit mounting bracket. In some embodiments, the drive unit mounting bracket includes a rubberized material configured to dampen the drive unit arm when the ground connection is in the disconnected state.
In some embodiments, the system further includes a tuned member (tuned member) configured to amplify vibrations at a selected frequency. In some embodiments, the tuning member is configured to act as a low pass filter. In some embodiments, the tuning member is configured to act as a band pass filter. In some embodiments, the tuning member comprises the drive unit arm. In some embodiments, the tuning member comprises a body member connecting the body to the ground connection. In some embodiments, the tuning member comprises a tuned resonance link (tuned resonance link) connected to the ground connection. In some embodiments, the tuned resonant link is tuned to a frequency of 100 Hz.
In some embodiments, the system further comprises a tuning member configured to amplify vibrations within a selected frequency range.
In some embodiments, the drive unit arm is configured to move based on the drive unit output torque, and when the drive unit output torque is less than a threshold output torque, the drive unit arm moves to a first position, thereby placing the selectively engaged ground connection in an open state, and when the drive unit output torque is greater than the threshold output torque, the drive unit arm moves to a second position, thereby placing the selectively engaged ground connection in a closed state.
In some embodiments, the selectively engageable ground connection includes a spring member configured to modulate vibration through the ground connection.
In some embodiments, the selectively engageable ground connection includes a flexible metal member configured to modulate vibrations through the ground connection.
According to an alternative embodiment, an auditory feedback system for an electrically powered vehicle is provided. The auditory feedback system comprises: a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm; a body for the electrically powered vehicle; and a selectively engageable ground connection. The selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when the drive unit output torque exceeds a threshold output torque. The system also includes a tuning member configured to amplify the vibrations at the selected frequency. The tuning member is configured to act as a band pass filter.
According to an alternative embodiment, a method for providing audible feedback for an electrically powered vehicle is provided. The method includes retaining a drive unit for the electrically powered vehicle with a plurality of drive unit mounting brackets, wherein the drive unit mounting brackets enable the drive unit to change orientation relative to the remainder of the vehicle as a function of drive unit output torque. The method also includes positioning an extended drive unit arm connected to the drive unit within a selectively engageable ground connection configured to transmit vibrations from the drive unit to a body of the electrically powered vehicle. The selectively engageable ground connection is in a closed state and is operable to transmit vibrations when the drive unit output torque exceeds a threshold output torque. The method also includes transmitting vibrations from the drive unit to the vehicle body to provide the audible feedback.
In some embodiments, the method further includes tuning one of the drive arm and a body member connected to the body to amplify the vibration at the selected frequency.
The invention also comprises the following technical scheme.
An auditory feedback system for an electrically powered vehicle, the auditory feedback system comprising:
a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm;
a body for the electrically powered vehicle; and
a selectively engageable ground connection; and
wherein the selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when a drive unit output torque exceeds a threshold output torque.
An auditory feedback system according to claim 1, wherein the selectively engageable ground connection is a separate ground connection unit.
wherein the selectively engageable ground connection is embedded within the drive unit mounting bracket.
An auditory feedback system according to claim 3, wherein the drive unit mounting bracket comprises a rubberized material configured to dampen the drive unit arm when the ground connection is in the disconnected state.
An auditory feedback system as in claim 5, wherein the tuning member is configured to act as a low pass filter.
An auditory feedback system as in claim 5, wherein the tuning member is configured to act as a band pass filter.
An auditory feedback system according to claim 5, wherein the tuning member comprises the drive unit arm.
An auditory feedback system according to claim 5, wherein the tuning member comprises a body member connecting the body to the ground connection.
An auditory feedback system according to claim 5, wherein the tuning member comprises a tuned resonant link connected to the ground connection.
An auditory feedback system according to claim 5, wherein the tuning member is tuned to a frequency of 100 Hz.
The auditory feedback system of claim 1, further comprising a tuning member configured to amplify vibrations within a selected frequency range.
An auditory feedback system according to claim 1, wherein the drive unit arm is configured to move based on a drive unit output torque;
wherein when the drive unit output torque is less than the threshold output torque, the drive unit arm moves to a first position, thereby placing the selectively engaged ground connection in a disconnected state; and
wherein when the drive unit output torque is greater than the threshold output torque, the drive unit arm moves to a second position, thereby placing the selectively engageable ground connection in the closed state.
The auditory feedback system of claim 1, wherein the selectively engageable ground connection includes a spring member configured to modulate vibration through the selectively engageable ground connection.
The auditory feedback system of claim 1, wherein the selectively engageable ground connection comprises a flexible metallic member configured to modulate vibration through the selectively engageable ground connection.
An audible feedback system for an electrically powered vehicle, the audible feedback system comprising:
a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm;
a body for the electrically powered vehicle; and
a selectively engageable ground connection;
wherein the selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when a drive unit output torque exceeds a threshold output torque;
wherein the auditory feedback system further comprises a tuning member configured to amplify vibrations at a selected frequency; and
wherein the tuning member is configured to act as a band pass filter.
A method for providing audible feedback for an electrically powered vehicle, the method comprising:
holding a drive unit for the electrically powered vehicle with a plurality of drive unit mounting brackets, wherein the drive unit mounting brackets enable the drive unit to change orientation relative to the electrically powered vehicle as a function of drive unit output torque;
positioning an extended drive unit arm connected to the drive unit within a selectively engageable ground connection configured to transmit vibrations from the drive unit to a body of the electrically powered vehicle, the selectively engageable ground connection being in a closed state operable to transmit the vibrations when the drive unit output torque exceeds a threshold output torque; and
transmitting the vibration from the drive unit to the vehicle body to provide the audible feedback.
Scheme 18. the method of scheme 17, further comprising tuning one of the drive unit arm and a body member coupled to the body to amplify the vibration at the selected frequency.
The above features and advantages and other features and advantages of the present disclosure are readily apparent from the following detailed description of the best modes for carrying out the disclosure when taken in connection with the accompanying drawings.
Drawings
Fig. 1 schematically illustrates an exemplary drive unit, an exemplary damped drive unit mounting bracket, and an exemplary drive unit mounting bracket including a ground connection according to the present disclosure;
FIG. 2 schematically illustrates in side view a drive unit mounting bracket including the ground connection of FIG. 1, wherein the connected drive unit is operated with a low torque using a motor and the ground connection is in an open state, in accordance with the present disclosure;
FIG. 3 schematically illustrates, in side view, a drive unit mounting bracket including the ground connection of FIG. 2, wherein the connected drive unit is operated with a high torque using a motor, wherein the resulting rotation of the connected drive unit brings the ground connection to a closed state, in accordance with the present disclosure;
FIG. 4 schematically illustrates, in a side cross-sectional view, an electrically powered vehicle including the drive unit of FIG. 1 and an exemplary passenger compartment component that may be connected to a ground connection to provide audible feedback to a driver in the passenger compartment, in accordance with the present disclosure;
FIG. 5 graphically illustrates an exemplary audible feedback response for an electrically powered vehicle showing the audible feedback as measured within a passenger compartment of the vehicle, in accordance with the present disclosure;
FIG. 6 graphically illustrates an auditory feedback response for an electrically powered vehicle including a ground connection, illustrating the auditory feedback as measured within a passenger compartment of the vehicle, in accordance with the present disclosure;
FIG. 7 schematically illustrates a first exemplary embodiment of a drive unit mounting bracket and drive unit arm including a ground connection in an open state, according to the present disclosure;
FIG. 8 schematically illustrates the drive unit mounting bracket and drive unit arm of FIG. 7 including a ground connection in a closed state according to the present disclosure;
FIG. 9 schematically illustrates a second exemplary embodiment of a drive unit mounting bracket and drive unit arm including a ground connection and a tuned resonant link, wherein the ground connection is in an open state, in accordance with the present disclosure;
FIG. 10 schematically illustrates the drive unit mounting bracket and drive unit arm of FIG. 9 including a ground connection in a closed state according to the present disclosure;
FIG. 11 graphically illustrates frequency responses of both a drive unit and a vehicle body showing a transmission increase that may occur based on tuning components of the system to a desired audible feedback frequency or frequency range, in accordance with the present disclosure;
fig. 12 schematically illustrates, in cross-section, an exemplary independent ground connection unit existing outside of a drive unit mounting bracket, including a spring member between the drive unit arm and other components of the ground connection, according to the present disclosure;
FIG. 13 schematically illustrates, in cross-section, another example independent ground connection unit including a composite metal and rubber member between a drive unit arm and other components of a ground connection, in accordance with the present disclosure; and
fig. 14 illustrates a fifth exemplary embodiment of a drive unit mounting bracket and drive unit arm including a ground connection including a rigid car body mounting cavity of rubberized material surrounding the ground connection according to the present disclosure.
Detailed Description
When the driver commands a violent acceleration, the driver expects audible feedback from the vehicle. When the driver pushes the accelerator pedal sharply to the floor or down, the driver may prefer to hear a low rumble, for example, in the audio range of 100 Hz.
An audible feedback system for an electrically powered vehicle is provided in which a mechanical ground (out) is selectively engaged between a drive unit and a body of the vehicle with high motor torque, and sound is transmitted from the drive unit to the body through the ground (out). In one embodiment, the ground is implemented as a ground connection to a component selected to simulate a simple mass, spring, and damper system.
The disclosed system and method adds a desired low frequency electric vehicle drive unit command sound (order sound) by designing a mechanical ground when the drive unit is under high torque. When the customer accelerates, a sound with a low frequency offset (low frequency biased sound) is desired. The system and method describe a designed mechanical grounding device that engages when the drive unit reaches a given torque threshold that will deliver the desired low frequency sound. Passive mechanical systems are designed to provide structural propagation paths into the vehicle, resulting in the desired lower frequency sound. The path is configured to engage during a high torque event. The mechanical connection between the drive unit and the body can be designed as a band-pass filter to amplify the command sound at a desired low frequency, for example about 100 Hz.
According to one embodiment, the drive unit may contact a cantilevered bracket with added bumpers to mitigate contact noise. The cantilevered mount may have a primary natural frequency in a desired low frequency range.
Fig. 1 illustrates an exemplary drive unit, an exemplary damped drive unit mounting bracket, and an exemplary drive unit mounting bracket including a selectively engageable ground connection. The drive unit 10 is shown to include the components necessary to provide power or torque to an electrically powered vehicle. The electric machine 12, which may alternatively be described as a motor and generator, is shown to include an exemplary cylindrical unit including an internal rotor and stator configuration in which electrical power may be converted to torque on or transmitted through the machine output shaft. The drive unit 10 vibrates during operation. One or more drive unit mounting brackets 20 may be used to retain the drive unit 10 within the drive unit compartment of the vehicle. The drive unit mounting bracket 20 may comprise a rubberized or other similar bracket material useful for dampening the effects of vibrations of the drive unit 10 on the rest of the vehicle. In some situations, the transmitted vibrations from the drive unit 10 may be used to provide desired audible feedback to allow the driver to hear a desired sound frequency.
A drive unit mounting bracket 30 is shown including an embedded ground connection. In the high-torque state, the drive unit 10 can change orientation from its orientation at rest and its orientation in the low-torque state. The torque transmitted through the output shaft of the motor 12 not only acts on the drive shaft of the vehicle to power the vehicle, but it also acts on the motor 12. This torque on the motor 12 and on the drive unit 10 may cause the drive unit 10 to compress the rubberized parts of the drive unit mounting bracket 20. This change in orientation of the drive unit 10 in the high torque state is repeatable and predictable. As a result, drive unit mounting bracket 30, including the ground connection, may utilize such predictable changes in orientation of drive unit 10 to selectively close the mechanical ground to the vehicle body, thereby intentionally increasing the transmission of vibrations from drive unit 10 to the rest of the vehicle. By selecting which body components to transmit the increased vibration to, and by selectively tuning portions of the system, audible feedback at a desired frequency or within a desired frequency range can be generated through the ground.
Fig. 2 schematically illustrates in side view a drive unit mounting bracket including the selectively engageable ground connection of fig. 1, wherein the connected drive unit is operated with a low torque by the motor, and the ground connection is in a disconnected state. Fig. 2 shows a drive unit mounting bracket 30 including a built-in ground connection 33, the built-in ground connection 33 including a drive unit arm 16, the drive unit arm 16 being connected to the drive unit and moving when the drive unit 10 changes orientation due to a high torque condition. Depending on the desired direction of movement of the drive unit arm 16, the drive unit 10 may be oriented in any direction so that the resulting movement of the drive unit arm 16 may be in any direction. In the exemplary illustration of fig. 2, the attached drive unit is oriented such that the drive unit arm 16 moves in an upward direction when the drive unit is in a high torque state. In another exemplary system, a similar drive unit arm may move in a downward direction when the corresponding drive unit is in a high torque state.
The ground connection 33 may be described as being in an open state because the drive unit arm 16 is not in contact with the connection member 34. The connecting member 34 is selected or configured to transmit vibrations between the drive unit arm 16 and the body member 36 when the connecting member 34 is in direct contact with the drive unit arm 16. The drive unit mounting bracket 30 also includes a rubberized material 32 that surrounds and holds in place the drive unit arm 16 and the connecting member 34. The rubberized material 32 is configured to isolate the drive unit arm 16 from the body member 36 when the ground connection 33 is in the disconnected state.
Fig. 3 schematically illustrates, in side view, a drive unit mounting bracket including the selectively engageable ground connection of fig. 2, wherein the connected drive unit is operated with a high torque using a motor, wherein the resulting rotation of the connected drive unit brings the ground connection to a closed state. Fig. 3 shows the drive unit mounting bracket 30 including a ground connection 33, the ground connection 33 including the drive unit arm 16, the drive unit arm 16 being connected to the drive unit and moving when the drive unit 10 of fig. 1 changes orientation due to a high torque condition. The drive unit arm 16 is shown moving in an upward direction from its position in fig. 2, wherein the position of the drive arm 16 in fig. 2 is shown in dashed lines in fig. 3. The drive unit 10 and associated components of fig. 1 may be configured to change orientation or rotate to a degree sufficient to bring the drive unit arm 16 into contact with the connecting member 34 when the drive unit exceeds a threshold output torque. The drive unit arm 16 is shown in direct contact with the connecting member 34 so that the ground connection 33 can be described as being in a closed state and vibrations from the drive unit can be transmitted through the drive unit arm 16 and the connecting member 34 to the body component 36. The rubberized material 32 is configured to bend and/or stretch to allow desired movement of the drive unit arm 16 within the drive unit mounting bracket 30. The drive unit mounting bracket 30, drive unit arm 16, and other components of fig. 2 and 3 are exemplary, a variety of different embodiments of drive unit mounting brackets including ground connections are contemplated, and the present disclosure is not intended to be limited to the examples provided herein.
The ground connection according to the present disclosure may comprise two parts which are brought into contact to form a mechanical path for the transmission of vibrations from the drive unit to the vehicle body. The ground connection 33 in fig. 2 is disconnected or in a disconnected state and includes the connecting member 34, the drive unit arm 16 and the gap therebetween. The ground connection 33 in fig. 3 is a closed connection or in a closed state and comprises a connecting member 34 and the drive unit arm 16.
Fig. 4 illustrates, in a side cross-sectional view, an electrically powered vehicle including the drive unit of fig. 1 and an exemplary passenger compartment component connectable to a selectively engageable ground connection to provide audible feedback to a driver in the passenger compartment. The vehicle 100 is shown to include a drive unit 10, the drive unit 10 including an electric motor 12 and a passenger compartment 102. The drive unit 10 is held in place within the vehicle 100 by a drive unit mounting bracket 20. The drive unit mounting bracket 30, including the ground connection, is shown configured to selectively ground the drive unit 10 to the vehicle body member 36, thereby enabling selective transmission of vibrations from the drive unit 10 to the vehicle body member 36. In the case where the vehicle 100 is normally operating in the low torque state, the ground connection of the drive unit mounting bracket 30 is in the disconnected state, so that the vibration from the drive unit 10 is isolated from the vehicle body member 36. When the drive unit 10 is operated in the high torque state, the drive unit arm 16 moves upward within the drive unit mounting bracket 30, and the ground connection within the drive unit mounting bracket 30 becomes a closed state. When the drive unit 10 is maintained in the high torque state, vibrations are transmitted from the drive unit 10 to the vehicle body member 36 through the ground connection. When the drive unit 10 returns to the low torque state, the drive unit arm 16 moves downward within the drive unit mounting bracket 30 and the ground connection returns to the disconnected state.
Fig. 5 graphically illustrates a typical audible feedback response for an electrically powered vehicle, showing the audible feedback as measured within the passenger compartment of the vehicle for a vehicle without a ground connection between the drive unit and the vehicle body. The vertical axis shows the frequency of the auditory feedback experienced in the passenger compartment from the operation of the drive unit. The horizontal axis shows the time through the acceleration event. The multiple illustrated plots show different tones produced by the drive unit through a drive-off event by which the drive unit operates at different speeds and different torque outputs. The horizontal position on the graph shows the mix of tones at different sound frequencies that are audible at a particular time for each drive-off event. Each curve shows the tone that changes in pitch by a drive-off event. The intensity of the shading of the curve shows the intensity of the particular tone, with increasingly dense shading indicating an increase in the intensity of the sound audible to the driver. It can be seen that some limited variation in intensity occurs through the drive-off event, while the pitch through the 100 HZ range is generally equivalent or similar to the other pitches throughout the plot.
Fig. 6 graphically illustrates an auditory feedback response for an electrically powered vehicle including a selectively engaged ground connection, illustrating the auditory feedback as measured within a passenger compartment of the vehicle. The vertical axis shows the frequency of the auditory feedback experienced in the passenger compartment from the operation of the drive unit. The horizontal axis shows the time through the acceleration event. The multiple illustrated plots show different tones produced by the drive unit through a drive-off event by which the drive unit operates at different speeds and different torque outputs. The horizontal position on the graph shows the mix of tones at different sound frequencies that are audible at a particular time for each drive-off event. Each curve shows the tone that changes in pitch by a drive-off event. The intensity of the shading of the curve shows the intensity of the particular tone, with increasingly dense shading indicating an increase in the intensity of the sound audible to the driver. The ground connection of the illustrated system is configured to provide vibration at a selected frequency or within a selected range at the natural frequency of one of the connected components, in this example at approximately 100 Hz. As a result, a sharp increase in the auditory feedback intensity is evident when each of the illustrated tones passes through 100 Hz. When the vibration provided by a closed ground connection is about 100 Hz, the vibration is amplified by selecting the natural frequency of the tuning member of the ground connection or the member attached to the ground connection. As a result, during this acceleration event, the driver hears a significant audible feedback of approximately 100 Hz, which can be described as a low frequency rumble. Such low frequency rumble during a hard acceleration event may give the driver the impression that: high power, and immediate application of torque to accelerate the vehicle.
Fig. 7 illustrates in cross-section a first exemplary embodiment of a drive unit mounting bracket and drive unit arm including a selectively engageable ground connection, wherein the ground connection is in a disconnected state. Drive unit mounting bracket 230 is shown to include drive unit arm 216, connecting member 238, and rubberized material 232, rubberized material 232 surrounding drive unit arm 216 and isolating drive unit arm 216. The drive unit mounting bracket 230 includes a ground connection shown in a disconnected state, wherein vibrations from an attached drive unit are not transmitted through the drive unit mounting bracket 230. The drive unit arm 216 is configured to move downward when the attached drive unit is operating in a high torque state. The underside of the drive unit arm 216 includes an optional coating 236 configured to engage the connecting member 238 when the ground connection is shown in a closed state. A gap 237 exists between the coating 236 and the attachment member 238. The rubberized material 234 allows the drive unit arm 216 to be positioned in an upward direction while still isolating the drive unit arm 216 from the rest of the vehicle.
Fig. 8 illustrates the drive unit mounting bracket and drive unit arm of fig. 7 including a selectively engageable ground connection, wherein the ground connection is in a closed state. Drive unit mounting bracket 230 is shown to include drive unit arm 216, connecting member 238, and a rubberized material surrounding drive unit arm 216. Drive unit mounting bracket 230 includes a ground connection 233, shown in a closed state, wherein vibrations from an attached drive unit are transmitted through the drive unit arm, through coating 236, through connecting member 238 and into an attached vehicle body component. A gap 239 is shown into which the drive unit arm 216 can move when the attached drive unit returns to a low torque state.
Fig. 9 illustrates in cross-section a second exemplary embodiment of a drive unit mounting bracket and drive unit arm including a selectively engageable ground connection and a tuned resonant link, wherein the selectively engageable ground connection is in a disconnected state. The drive unit mounting bracket 230 of fig. 7 is shown to include a connecting member 238 connected to a tuned resonant link 240, the resonant link 240 being attached to a body member 242. The tuned resonant rod 240 is configured to act as a band pass filter, amplifying or using resonance to enhance vibrations at a desired frequency while passively allowing or filtering out vibrations above or below the desired frequency. The drive unit mounting bracket 230 is shown with the associated ground connection 233 in an open state.
Tuning resonant link 240 is provided as one exemplary tuning member within or attached to a ground connection designed or constructed to have a natural frequency at a selected frequency (e.g., 80 Hz, 100 Hz, or 120 Hz) or within a range of frequencies. A plurality of tuning members having natural frequencies within a selected range may amplify sound at various frequencies within the range such that the totality of sound together produces an amplified set of sound within the desired range. An exemplary desired range of sound may be 500 Hz or less. The tuning members may include drive unit arms, body members, connecting members, and dedicated links, such as tuned resonant link 240 of fig. 9.
Fig. 10 illustrates the drive unit mounting bracket and drive unit arm of fig. 9 including a selectively engageable ground connection, wherein the selectively engageable ground connection is in a closed state. The drive unit mounting bracket 230 of fig. 7 is shown to include a connecting member 238 connected to a tuned resonant link 240, the resonant link 240 being attached to a body member 242. Drive unit mounting bracket 230 is shown with associated ground connection 233 in a closed state and vibration is transferred through drive unit arm 216, through connecting member 238, through tuned resonant link 240 to body member 242. A tuning member, such as tuned resonant link 240, may be configured to act as a band pass filter, amplifying or using resonance to enhance vibrations at a desired frequency while passively allowing or filtering out vibrations above or below the desired frequency. In another embodiment, a tuning member, such as tuned resonant link 240, may act as a low pass filter. The drive unit mounting bracket 230 is shown with the associated ground connection 233 in a closed state.
Fig. 11 graphically illustrates the frequency response of both the drive unit and the vehicle body, illustrating the increase in transmissivity that may occur based on tuning the components of the system to a desired audible feedback frequency or range of frequencies. The vertical axis shows the response amplitude in the measured object in response to a constant amplitude input vibration through a range of test frequencies. The horizontal axis shows the range of test frequencies. The upper plot 302 shows the response of the drive unit to each test frequency. The lower plot 304 shows the response of the body attached to the drive unit to each test frequency. Efficient transfer of vibration between the drive unit and the body can be seen at plot points 306 and 308, where the vibration of the body may peak due to the body being designed to have a natural frequency at this input frequency, for example, through selective geometry and mass placement, and where the response amplitudes of the drive unit and body are nearly matched.
Fig. 12 schematically illustrates, in cross-section, an exemplary independent ground connection unit existing outside of a drive unit mounting bracket, the independent ground connection unit including a spring member between the drive unit arm and other components of the ground connection, the spring member configured to modulate or control vibration through the ground connection. The independent ground connection unit 330 is shown to include a drive unit arm 316, a spring unit 319, a tuned resonant link 340, a body member 341, and a dash surface 342. The spring unit 319 and tuned resonant link 340 may act together as a spring and damper unit, providing a band pass filter for the desired frequency of vibration transmitted through the independent ground unit 330. The transmission of vibration through the spring unit 319 and the tuned resonant link 340 can be selectively controlled based on the movement of the drive unit arm 316.
Fig. 13 illustrates, in cross-section, another exemplary independent ground connection unit including a composite metal and rubber member located between the drive unit arm and other components of the ground connection and configured to modulate or control vibration through the ground connection. Independent ground unit 430 is shown to include drive unit arm 416, flexible metal member 436, rubberized material 432, tuned resonant link 434, body member 440, and instrument panel surface 442. Collectively, flexible metal member 436 and tuned resonant link 434 can function similar to spring unit 319 and tuned resonant link 340 of fig. 12, thereby acting as a spring and damper unit, providing a band pass filter for the desired frequency of vibration transmitted through independent ground unit 430, wherein movement of drive unit arm 416 changes the characteristics of vibration transmission through the illustrated components.
FIG. 14 illustrates, in cross-section, another exemplary embodiment of a drive unit mounting bracket and drive unit arm including a selectively engageable ground connection including a rigid car body mounting cavity of rubberized material surrounding the ground connection. A drive unit mounting bracket 530 is shown. A drive unit arm 516 is provided which is surrounded by a rubberized material 532 and held in place by the rubberized material 532. The connecting member 538 is shown. An isolation material 539 is shown between the drive unit arm 516 and the connecting member 538. When the drive unit arm 516 is in the upward position, the isolation material 539 isolates vibrations from the drive unit arm 516 from reaching the connection member 538. When the drive unit arm 516 moves to the downward position due to operation of the connected drive unit in the high torque state, the isolation material 539 either compresses to a point where it cannot significantly isolate the vibration or it moves out from between the drive unit arm 516 and the connecting member 538. The drive unit mounting bracket 530 and its components fit within a rigid vehicle body mounting cavity 531, the rigid vehicle body mounting cavity 531 being configured to efficiently transmit vibrations to the remainder of the vehicle body.
While the best modes for carrying out the disclosure have been described in detail, those familiar with the art to which this disclosure relates will recognize various alternative designs and embodiments for practicing the disclosure within the scope of the appended claims.
Claims (10)
1. An auditory feedback system for an electrically powered vehicle, the auditory feedback system comprising:
a drive unit for the electrically powered vehicle, the drive unit including a drive unit arm;
a body for the electrically powered vehicle; and
a selectively engageable ground connection; and
wherein the selectively engageable ground connection is in a closed state and connects a mechanical path to transmit vibrations from the drive unit arm to the vehicle body when a drive unit output torque exceeds a threshold output torque.
2. An auditory feedback system as claimed in claim 1, wherein the selectively engageable ground connection is a separate ground connection unit.
3. The auditory feedback system of claim 1, further comprising a drive unit mounting bracket; and
wherein the selectively engageable ground connection is embedded within the drive unit mounting bracket.
4. An auditory feedback system as claimed in claim 3, wherein the drive unit mounting bracket comprises a rubberized material configured to dampen the drive unit arm when the ground connection is in the disconnected state.
5. The auditory feedback system of claim 1, further comprising a tuning member configured to amplify vibrations at a selected frequency.
6. An auditory feedback system as recited in claim 5, wherein the tuning member is structured to act as a low pass filter.
7. An auditory feedback system as recited in claim 5, wherein the tuning member is configured to act as a band pass filter.
8. An auditory feedback system as recited in claim 5, wherein the tuning member comprises the drive unit arm.
9. An auditory feedback system as recited in claim 5, wherein the tuning member comprises a body member connecting the body to the ground connection.
10. An auditory feedback system as recited in claim 5, wherein the tuning member comprises a tuning resonant link connected to the ground connection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201916522820A | 2019-07-26 | 2019-07-26 | |
| US16/522820 | 2019-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112298081A true CN112298081A (en) | 2021-02-02 |
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| CN202010724489.2A Pending CN112298081A (en) | 2019-07-26 | 2020-07-24 | Adding desired electric vehicle command sounds through passive mechanical systems |
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