EP3799034A1 - Véhicule de travail agricole doté d'une cabine - Google Patents

Véhicule de travail agricole doté d'une cabine Download PDF

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Publication number
EP3799034A1
EP3799034A1 EP20191042.9A EP20191042A EP3799034A1 EP 3799034 A1 EP3799034 A1 EP 3799034A1 EP 20191042 A EP20191042 A EP 20191042A EP 3799034 A1 EP3799034 A1 EP 3799034A1
Authority
EP
European Patent Office
Prior art keywords
noise
work vehicle
cabin
control unit
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20191042.9A
Other languages
German (de)
English (en)
Inventor
Arne Bohl
Max Reinecke
Grosse-Hündfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Claas Tractors SAS
Original Assignee
Claas Tractors SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Claas Tractors SAS filed Critical Claas Tractors SAS
Publication of EP3799034A1 publication Critical patent/EP3799034A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path

Definitions

  • the present invention relates to an agricultural work vehicle with a cabin according to the preamble of claim 1. Furthermore, the invention relates to a method for operating a noise damping system for an agricultural work vehicle.
  • the noise level in a cab of an agricultural work vehicle has a great influence on the performance and ability of the operator to concentrate. Operators of agricultural work vehicles are exposed to high levels of noise.
  • the noise caused by the work vehicle or its work units can exceed 80 dB and include psychoacoustic frequencies which are perceived as particularly unpleasant. In order to counteract this noise pollution, various measures are conceivable that a manufacturer of an agricultural work vehicle can carry out.
  • noise damping systems are used in the cabs of agricultural work vehicles, which contribute to noise reduction or background noise reduction through active noise compensation (Active Noise Canceling ANC).
  • An agricultural work vehicle of the type mentioned is from the EP 2 101 316 A1 known.
  • a vibration is transmitted into a driver's cab of the agricultural work vehicle from a source of noise outside the driver's cab on a first path into the driver's cab.
  • a noise damping system comprises a compensator element designed as a loudspeaker, which can be driven with a phase and amplitude adapted to the phase and amplitude of the transmitted vibration in order to emit a sound vibration which compensates for the vibration transmitted into the driver's cab.
  • sound vibrations of the same pitch as that Noise to be compensated is introduced from the loudspeaker into the cabin with a phase offset of ideally 180 °.
  • the use of the loudspeaker arranged in the cabin which as a rule is not positioned taking into account an arrangement that is optimal for the effect of active noise compensation, but is primarily arranged in a space-optimized manner, significantly limits the effect that can be achieved by the noise damping system.
  • a movement of at least the head of the operator for example because of a turn or nod, leads to a change in the distance between the ears and the loudspeaker.
  • This change in distance leads to a change in the phase offset between the noise source and the loudspeaker, as a result of which the achievable efficiency of noise reduction decreases. For this reason, a satisfactory reduction in the noise level is only achieved in a spatially limited area around the head.
  • noise damping systems which include headphones as a compensator element or actuator.
  • the loudspeakers of the headphones are therefore always in the immediate vicinity of the ears.
  • the long-term wearing of the headphones often for several hours, can be perceived as very annoying by the operator.
  • Wearing the headphones, which usually work wirelessly, is not ergonomic due to the weight that can be attributed to the batteries or accumulators required.
  • the headphones are less suitable as a compensator element of the noise damping system, since their function depends on the operator always carrying the headphones with him.
  • the invention is therefore based on the object of developing an agricultural work vehicle of the type mentioned at the beginning, which is characterized by higher efficiency and good comfort for an operator of the work vehicle.
  • an agricultural work vehicle with a cabin, a driver's seat arranged in the cabin for an operator and a noise dampening system for the cabin is proposed, the noise dampening system at least one actuator for active noise compensation of noises transmitted into the cabin at least one outside the cabin
  • the noise dampening system at least one actuator for active noise compensation of noises transmitted into the cabin at least one outside the cabin
  • the at least one actuator for its control is connected to a control unit of the noise damping system for signaling purposes
  • the cabin being assigned at least one sensor device for determining the position of the head of the operator, the control unit being set up, depending on the Position of the head to adapt the sound emitted by the at least one actuator for active noise compensation in order to minimize the noise in the vicinity of the head.
  • this is countered by the active monitoring of the position of the operator's head and the associated adaptation of the sound emitted by the at least one actuator.
  • the phase of the sound introduced to compensate for the respective background noise is shifted in such a way that the background noise and the sound have essentially opposite phases when reaching the ear or ears.
  • the adaptation, among other things, of the phase shift of the emitted sound to a change in the distance of the head or ears relative to the at least one actuator leads to the fact that the zone of reduced noise around the head, within which a satisfactory reduction in the noise level is achieved, is enlarged. At least the area moves permanently with the head, whereby an efficient and comfortable noise reduction is achieved with little effort.
  • the agricultural work vehicle can be, among other things, a tractor or a self-propelled harvesting machine such as a combine harvester or a forage harvester.
  • the at least one sensor device can be arranged on the work vehicle inside and / or outside the cabin, depending on its design and the operating principle according to which it works.
  • the sensor device can preferably be designed as an imaging sensor system.
  • the imaging sensor system can be designed as a camera, for example as a stereo camera, 3D camera or the like.
  • the sensor device can be designed as an active acoustic sensor system.
  • an ultrasonic sensor arrangement could be considered as an active acoustic sensor system.
  • the sensor device could be designed as a capacitive sensor system.
  • capacitance sensors can be embedded in the cabin roof above the head of the operator, between which an electric field is built up that is influenced by the presence of the head on the one hand and a change in position of the head on the other. By evaluating the change in the electric field, conclusions can be drawn about the respective position of the head.
  • the relative position of the center point can be determined determine the head of the operator by the control unit.
  • the coordinates of the ears can be determined.
  • the sensor device embodied as an imaging sensor system the position of the operator's ears can be determined directly by image recognition to be carried out by the control unit.
  • the imaging sensor system can be used for other applications, such as for a system for personalized recognition and identification and / or a system for recognizing fatigue or drowsiness on the part of the operator.
  • At least one microphone is arranged in the cabin, which is positioned in the vicinity of the head of the operator.
  • the microphone receives the sound generated for noise compensation.
  • the signals generated by the microphone are transmitted to the control unit and evaluated by it in order to determine the efficiency of the sound introduced to compensate for the interfering noises in the immediate area or in the immediate vicinity of the operator's ears.
  • the control unit controls the at least one actuator as a function of the evaluated signals of the at least one microphone.
  • the at least one microphone can be integrated into the driver's seat.
  • the at least one microphone can be integrated into the headrest of the driver's seat.
  • the headrest of the driver's seat and with it the at least one microphone can particularly preferably be height-adjustable.
  • the at least one microphone can be carried by the operator by means of a carrying device.
  • the at least one microphone preferably two microphones, is arranged on a carrying device which the operator can carry on his head, for example. It is also conceivable that the carrying device can be configured in the area of the shoulders or above them on the operator.
  • the at least one noise source of the agricultural work vehicle can be a work unit to which at least one acoustic sensor device for detecting sound emissions is assigned.
  • a working unit is to be understood as a device with moving parts that is used to drive or process and / or process harvested material and which emits sound that the operator in the cabin can acoustically perceive as background noise.
  • the working units of the agricultural work vehicle generate different sound emissions which vary in terms of frequency, amplitude and phase.
  • control unit is set up to receive and evaluate signals from the at least one acoustic sensor device.
  • control unit has additional information available in order to generate the sound required for noise compensation by the at least one actuator.
  • control unit can be in operative connection with a control device used to control working units of the work vehicle for receiving operating parameters and control parameters.
  • control unit of the noise damping system has information about the respective operating state of the working units, which is based on the signals of the at least one acoustic sensor device, and the operating parameters and control parameters that the control device uses to control the working units.
  • control unit can be set up to determine parameters for controlling the at least one actuator by modeling the noise situation on the basis of the operating parameters of the working units.
  • the control unit can create a digital model of the work vehicle as a function of the respective operating state of the work unit or units.
  • the modeling of a noise situation in the cabin that is to be expected based on the operating state of the work vehicle makes it possible to determine frequency spectra, phases and amplitudes of the various sound emissions of the noise sources in order to control the at least one actuator accordingly to compensate for them.
  • a continuous adaptation of the control of the at least one actuator by the control unit is achieved for optimized noise compensation.
  • an optimized noise compensation is achieved by adjusting the pitch, phase and volume to the background noise by determining the position of the ears and the noise situation.
  • a method for operating a noise damping system for an agricultural work vehicle is proposed, with a driver's seat arranged in a cabin of the work vehicle for an operator, the noise damping system comprising at least one actuator for active noise compensation of noises transmitted into the cabin, which is controlled by a Control unit of the noise damping system is controlled, as well as with at least one working unit forming a noise source, wherein a position of the head of the operator is continuously determined by means of at least one sensor device, the sound emitted by the at least one actuator for active noise compensation being adapted as a function of the determined position of the head in order to minimize the noise in the vicinity of the head.
  • sound emitted by the work units of the work vehicle can be recorded by acoustic sensor devices and evaluated by the control unit and taken into account when adjusting the control of the at least one actuator. It is conceivable, by evaluating the sound, to distinguish between interfering noises and useful noises that are emitted by the work units of the work vehicle. In this way, useful noises identified by the control unit can be fed to the operator through the at least one actuator, while the interfering noises are actively compensated for by the noise damping system.
  • operating parameters generated by the control unit of a control device of the work vehicle and control parameters for controlling the working units can be received and evaluated and, depending on the evaluation, a noise situation can be modeled by the control unit, on the basis of which the at least one actuator is controlled.
  • the control unit can create a digital model of the work vehicle as a function of the respective operating state of the working unit (s) and adapt it to ongoing changes in the operating state.
  • the modeling of the work vehicle makes it possible to determine frequency spectra, phases and amplitudes of the various sound emissions of the noise sources.
  • the modeling of the work vehicle can in particular be carried out independently of signals from the acoustic sensor devices.
  • a continuous adjustment the control of the at least one actuator can be achieved by the control unit for optimized noise compensation.
  • Fig. 1 a representation of an agricultural work vehicle 1 is shown by way of example and schematically.
  • the work vehicle 1 is designed as a tractor in the illustrated embodiment.
  • the work vehicle 1 can also be designed as a self-propelled harvesting machine.
  • the work vehicle 1 comprises a cabin 2 arranged on a chassis.
  • a drive motor 3 and a transmission 4 are provided for driving the work vehicle 1.
  • the drive motor 3 and the transmission 4 represent working units within the meaning of the invention.
  • the drive motor 3 drives wheels 5 arranged on a front axle and a rear axle, the speed-dependent rolling noises of which are also transmitted to the cab 2 as background noises.
  • the work vehicle 1 is set up to drive further work units which are arranged directly on the work vehicle 1 and are driven by a drive train of the work vehicle 1 or can be indirectly connected to the latter.
  • the indirectly drive-connected work unit can be received by a front or rear power lift and driven by a power take-off shaft.
  • a driver's seat 6 for an operator 7 of the work vehicle 1 is located in the cabin 2.
  • Reference number 8 denotes the head and reference number 9 denotes one of the ears of the operator 7.
  • an actuator 10 is arranged in the cabin 2 in the cabin 2 in the cabin 2 in the exemplary embodiment shown.
  • two actuators 10 are arranged, for example, below the car roof in the interior of the car 2.
  • Other positioning of the actuators 10 and / or a different, in particular higher, number of actuators 10 in the cabin 2 are conceivable.
  • the actuators 10 are part of a noise damping system 11, which is used for active noise compensation of noises transmitted into the cabin 2 at least from a noise source 12 of the work vehicle 1 located outside the cabin 2.
  • the working units of the work vehicle 1 are to be regarded as the noise sources 12 located outside the cabin 2.
  • a working unit is to be understood as a drive or the processing and / or processing of harvested material with moving parts which emits sound that can be acoustically perceived by the operator 7 in the cabin 2 as noise.
  • the working units of the agricultural work vehicle 1 Depending on their operating state, for example with a drive motor 3 idling or operating under full load, the working units of the agricultural work vehicle 1 generate different sound emissions or interfering noises that vary in terms of frequency, amplitude and phase.
  • At least one acoustic sensor device 22 for detecting the specific sound emissions can be assigned to each working unit.
  • the acoustic sensor devices 22 transmit their signals to a control unit 14 of the noise damping system 11 for evaluation.
  • At least one sensor device 13 for determining the position of the head 8 of the operator 7 is assigned to the cabin 2.
  • the sensor device 13 is preferably designed as an imaging sensor system, for example as a camera, in particular as a stereo camera.
  • the position of the head 8 is continuously detected by means of the sensor device 13.
  • the recorded data are transmitted to the control unit 14 of the noise damping system 11, which evaluates them.
  • the control unit 14 is in signaling connection with the two actuators 10 by means of a preferably wireless communication link 15.
  • at least one microphone 16, which is positioned in the vicinity of the head 8 of the operator 7, is arranged in the cabin 2.
  • the at least one microphone 16 is part of the noise damping system 11 and is used to simulate the acoustic perception of the operator 7 in the area of their ears 9.
  • the at least one microphone 16 can be integrated into the driver's seat 6, as in FIG Fig. 1 is indicated by way of example.
  • two microphones 16 can be integrated on both sides into a headrest (not shown) of the driver's seat 6, whereby a very close arrangement to the ears 9 of the operator 7 and a position of the two microphones 16 corresponding to the height position of the ears 9 can be achieved. It is advantageous if the headrest of the driver's seat 6 is also designed to be height-adjustable.
  • the at least one microphone 16 can be carried along by the operator 7 by means of a carrying device.
  • the at least one microphone 16, preferably two microphones, is arranged on a carrying device which can be carried by the operator 7 on the head 8, for example.
  • an embodiment of the carrying device that enables an arrangement in the area of the shoulders or above on the operator 7.
  • the microphones 16 are also in signal connection with the control unit 14 via a, preferably wireless, communication connection 15. Signals received by the microphones 16 are transmitted to the control unit 14 and evaluated by the latter. The microphone 16 receives the sound generated by the actuators 10 for noise compensation. The control unit 14 evaluates the signals from the microphones 16 in order to determine the efficiency of the sound introduced by the actuators 10 to compensate for the background noises in the immediate area of the ears 9 of the operator 7. The control unit 14 controls the actuators 10 as a function of the evaluated signals of the at least one microphone 16.
  • the control unit 14 is set up to adapt the sound emitted by the at least one actuator 10 for active noise compensation as a function of the respective position of the head 8, in order to minimize the noise in the vicinity of the head 8.
  • the control unit 14 is set up to adapt the sound emitted by the at least one actuator 10 for active noise compensation as a function of the respective position of the head 8, in order to minimize the noise in the vicinity of the head 8.
  • the phase of the sound introduced to compensate for the respective interfering noises is shifted when actuating the actuators 10 in such a way that the interfering noises and the sound have essentially opposite phases when they reach the ear 9 or ears 9.
  • the adaptation, among other things, of the phase shift of the emitted sound to a change in distance relative to the at least one actuator 10 leads to the fact that the zone 18 of reduced noise around the head 8, within which a satisfactory reduction in the noise level is achieved, is enlarged. At least wanders the zone 18 permanently with the head 8, whereby an efficient and comfortable noise reduction is achieved with little effort.
  • the control unit 14 Based on the knowledge of the position of the sensor device 13 assigned to the cabin 2 for detecting the position of the head 8, the relative position of the center point of the head 8 of the operator 7, a distance 19, can be determined by the control unit 14. In connection with a predeterminable distance value for the position of the ears 9 relative to the center point of the head 8 determined by the sensor device 13, the coordinates of the ears 9 can be determined.
  • the working vehicle 1 has a control device 20 which receives and evaluates operating parameters or control parameters of the working units generated by sensors assigned to them or by control units and in Control parameters are generated as a function of this and are transmitted to them in order to control the working units.
  • the control device 20 is connected to the working units by a bus system 21.
  • the control unit 14 of the noise damping system 11 is connected to the control device 20 by the bus system 21.
  • the control unit 14 is set up to receive the operating parameters and control parameters which are provided or generated by the control device 20.
  • the control unit 14 evaluates received operating parameters as well as control parameters for activating the working units in order to model a noise situation as a function of the evaluation, on the basis of which the at least one actuator 10 is activated.
  • the control unit 14 can create a digital model of the work vehicle 1 as a function of the respective operating state of the working unit (s) and continuously adapt it to ongoing changes in the operating state.
  • the modeling of the noise situation in the cabin 2 of the work vehicle 1 enables To determine frequency spectra, phases and amplitudes of the various sound emissions of the noise sources 12 in order to control the actuators 10 accordingly to compensate them.
  • the modeling of the work vehicle 1 can in particular be carried out independently of signals from the acoustic sensor devices 22.
  • a continuous adaptation of the control of the at least one actuator 10 by the control unit 14 can be achieved for optimized noise compensation.
  • the modeling of the noise situation as a function of the operating state of the work vehicle 1 can in particular be carried out independently of signals from the acoustic sensor devices 22.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP20191042.9A 2019-09-25 2020-08-14 Véhicule de travail agricole doté d'une cabine Withdrawn EP3799034A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019125788.3A DE102019125788A1 (de) 2019-09-25 2019-09-25 Landwirtschaftliches Arbeitsfahrzeug mit einer Kabine

Publications (1)

Publication Number Publication Date
EP3799034A1 true EP3799034A1 (fr) 2021-03-31

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EP20191042.9A Withdrawn EP3799034A1 (fr) 2019-09-25 2020-08-14 Véhicule de travail agricole doté d'une cabine

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EP (1) EP3799034A1 (fr)
DE (1) DE102019125788A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022205309A1 (de) 2022-05-27 2023-11-30 Brose Fahrzeugteile Se & Co. Kommanditgesellschaft, Bamberg Verfahren zum Betrieb eines Innenraums eines Kraftfahrzeugs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101316A1 (fr) 2008-03-12 2009-09-16 CLAAS Selbstfahrende Erntemaschinen GmbH Machine de travail agricole dotée d'une cabine insonorisée
US20130182865A1 (en) * 2011-12-30 2013-07-18 Agco Corporation Acoustic fault detection of mechanical systems with active noise cancellation
US20140226831A1 (en) * 2013-02-08 2014-08-14 GM Global Technology Operations LLC Active noise control system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101316A1 (fr) 2008-03-12 2009-09-16 CLAAS Selbstfahrende Erntemaschinen GmbH Machine de travail agricole dotée d'une cabine insonorisée
US20130182865A1 (en) * 2011-12-30 2013-07-18 Agco Corporation Acoustic fault detection of mechanical systems with active noise cancellation
US20140226831A1 (en) * 2013-02-08 2014-08-14 GM Global Technology Operations LLC Active noise control system and method

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