JP6170325B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator.

  In general, when a construction machine such as a hydraulic excavator is operated, noise is constantly generated from an engine, a fan, a hydraulic pump, or the like provided in the construction machine. This noise causes discomfort to an operator who operates the construction machine in the cab room for operating the construction machine. Therefore, a noise reduction device that reduces the noise may be provided in the cab room.

  For example, Patent Document 1 discloses an upper frame, a machine room provided on the upper frame and mounted with an engine, a work attachment mounted on the upper frame and driven by a hydraulic cylinder, and the work There is disclosed a construction machine including a cab chamber provided with an operation member for operating an attachment, and a noise reduction device for reducing noise in the cab chamber. The noise reduction device includes a microphone for detecting noise in the cab room, a phase inversion unit for inverting the phase of noise detected by the microphone, and a control sound generated by the phase inversion unit is output to the cab room. Speaker. That is, the noise reduction device described in Patent Document 1 is based on a so-called feedback control method.

  When the control sound is output into the cab room, the steady noise generated from the engine or the like and reaching the cab room is canceled out by the control sound, so that the noise in the cab room is reduced. In addition, since the noise generated from the engine or the like is approximately a steady sound, it is effectively canceled by the control sound.

JP 2001-173018 A

  In general, in construction machines, an impact sound is often generated when a hydraulic cylinder that drives the work attachment reaches a stroke end. When such an impact sound is generated in the construction machine described in Patent Document 1 and enters the cab room, the noise reduction device outputs a control sound that cancels the impact sound into the cab room. However, this impact sound is generated once or irregularly, unlike the steady noise generated from an engine, a fan or the like, and the impact sound is caused by the control delay of the noise reduction device. Since the control sound is output with a slight delay from reaching the cab room, not only the impact sound cannot be canceled by the control sound but also the operator cancels the shock sound following the shock sound. Therefore, there is a problem that the control sound mixed with the impact sound is heard and the control of the noise reduction device may diverge.

  An object of the present invention is to provide a construction machine that can suppress divergence of control of a noise reduction device due to an impact sound generated when a hydraulic cylinder of a work attachment reaches a stroke end.

  As means for solving the above-mentioned problems, the present invention is a construction machine, which is mounted on the upper frame, a machine room disposed on the upper frame and mounted with an engine, and the upper frame. A work attachment driven by a hydraulic cylinder, an operating member for operating the hydraulic cylinder, a cab chamber in which the operating member is provided, a noise reduction device for reducing noise in the cab chamber, and the noise Control means for controlling the operation of the reduction device, wherein the noise reduction device is disposed in the cab chamber, detects the noise, converts the noise into a noise signal, and the noise detection means. Control signal generation means for generating a control signal that can be converted into a control sound that reduces the sound pressure of the noise detected in step based on the noise signal; Control sound emission means for converting the control signal into control sound and releasing the control sound into the cab chamber, the control means having a preset immediately preceding position immediately before the stroke end of the hydraulic cylinder; A construction machine that stops the operation of the noise reduction device when it is detected that the hydraulic cylinder is positioned between the stroke end and the stroke end.

  According to the present invention, since the operation of the noise reduction device is stopped immediately before the impact noise is generated, that is, immediately before the hydraulic cylinder reaches the stroke end, the impact noise is generated when the hydraulic cylinder reaches the stroke end. Even if it occurs, the noise reduction device does not generate control sound mixed with impact sound. Therefore, the operator can avoid listening to the control sound mixed with the impact sound.

  In this case, when the control means detects that the hydraulic cylinder is located at least on the side opposite to the stroke end side from the immediately preceding position after the operation of the noise reduction device is stopped, the noise reduction device. It is preferable to resume the operation.

  In this way, the operation of the noise reduction device is resumed when the hydraulic cylinder is positioned on the side opposite to the stroke end side with respect to the immediately preceding position, so that a control sound mixed with impact sound is generated. The noise generated from the engine or the like can be effectively reduced while avoiding this.

  Further, in this case, the control means adds the hydraulic pressure when detecting that the hydraulic cylinder is located on the opposite side of the stroke end side from the immediately preceding position after the operation of the noise reduction device is stopped. It is preferable to restart the operation of the noise reduction device even when it is detected that the cylinder is displaced toward the side opposite to the stroke end side.

  In this way, the operating state of the noise reduction device can be more reliably improved in the normal state while avoiding the adverse effects on the noise reduction device due to the impact sound generated when the hydraulic cylinder reaches the stroke end. I can return.

  Further, as another means for solving the above-mentioned problems, the present invention relates to a construction machine, which is an upper frame, a machine room disposed on the upper frame and mounted with an engine, and the upper frame. A work attachment mounted and driven by a hydraulic cylinder, an operation member for operating the hydraulic cylinder, a cab chamber provided with the operation member therein, and a noise reduction device for reducing noise in the cab chamber And a control means for controlling the operation of the noise reduction device, and the noise reduction device is disposed in the cab chamber, detects the noise, and converts the noise into a noise signal, and a noise detection means. A control signal generator that generates a control signal that can be converted into a control sound that reduces the sound pressure of the noise detected by the noise detection means based on the noise signal. And control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber, the control sound generating means comprising the control sound emitting means and the noise detecting means. A second-order filter that stores a transfer function that is identified in advance, and a coefficient that updates the filter coefficient in accordance with the noise signal so that the sound pressure of the noise detected by the noise detection means is minimized. An update unit; a coefficient storage unit that stores the filter coefficient updated by the coefficient update unit and outputs the filter coefficient; and the control signal based on the filter coefficient and the noise signal output from the coefficient storage unit A control signal generation unit for generating the noise signal, the off-state in which the noise signal is directly input to the secondary filter and the control signal generation unit, and the noise signal is rewritten to zero before the secondary system filter. And a zero signal overwrite unit that can be switched to an ON state input to the filter and the control signal generation unit, and the control means includes a preset immediately preceding position that is immediately before a stroke end of the hydraulic cylinder and the stroke. There is provided a construction machine that sets the zero signal overwriting unit to the ON state when it is detected that the hydraulic cylinder is positioned between the end and the end.

  Also in the present invention, even if an impact sound is generated when the hydraulic cylinder reaches the stroke end, the noise reduction control sound does not generate the control sound mixed with the impact sound, so that the operator listens to the control sound mixed with the impact sound. Can be avoided. Specifically, the control means sets the zero signal overwrite unit to the ON state immediately before the impact sound is generated, that is, immediately before the hydraulic cylinder reaches the stroke end, and as a result, the coefficient update unit. Since the update of the filter coefficient is also stopped, generation of control sound mixed with impact sound for canceling the impact sound is avoided. The control signal is obtained by a convolution calculation of the noise signal and the filter coefficient. However, since the noise signal is zeroed by the zero signal overwriting unit, the control signal generated by the control signal generation unit The signal becomes zero, thereby avoiding the emission of the control sound mixed with the impact sound from the control sound emitting means.

  In this case, it is preferable that the noise reduction apparatus inputs the control signal generated by the control signal generation unit to the secondary filter and the control signal generation unit via a secondary system control filter.

  In this way, since the noise reduction device itself is operating, while avoiding the generation of the control sound mixed with the impact sound, the engine sound generated when the zero signal overwrite unit is in the ON state, etc. A noise reduction effect of stationary sound can also be obtained. Specifically, by overwriting the noise signal detected by the noise detection means and input to the noise control generation means to zero, the filter coefficient is updated by detecting the detection sound immediately before the occurrence of the impact sound, that is, the impact sound. Since only the control signal generated by the control signal generation unit immediately before the generation is used, the filter coefficient does not change from the state immediately before the generation of the impact sound, and the impact sound is generated from the control signal generation unit. A control signal similar to that immediately before is continuously generated. Alternatively, the update of the filter coefficient itself may be stopped, and the control signal may be generated using the detected sound immediately before the impact sound is generated and the filter coefficient. In any case, the noise signal mixed with impact sound is not used for learning for updating the filter coefficient, so that the divergence of the control of the noise reduction device is suppressed.

  In the present invention, when the control means detects that the hydraulic cylinder is positioned at least on the side opposite to the stroke end side from the immediately preceding position after the zero signal overwriting portion is turned on. It is preferable that the zero signal overwrite unit is in the off state.

  In this way, when the hydraulic cylinder is positioned on the side opposite to the stroke end side with respect to the immediately preceding position, the zero signal overwrite unit is turned off, that is, steady noise can be reduced. Since the generation of the control sound is resumed, it is possible to effectively reduce the noise generated from the engine or the like while avoiding the generation of the control sound mixed with the impact sound.

  In this case, the control means adds the zero signal overwriting unit to the on state, and then detects that the hydraulic cylinder is located on the opposite side of the stroke end side from the immediately preceding position, It is preferable that the zero signal overwriting unit is also turned off when it is detected that the hydraulic cylinder is displaced toward the side opposite to the stroke end side.

  In this way, the operating state of the noise reduction device can be more reliably improved in the normal state while avoiding the adverse effects on the noise reduction device due to the impact sound generated when the hydraulic cylinder reaches the stroke end. I can return.

  Further, as another means for solving the above-mentioned problems, the present invention relates to a construction machine, which is an upper frame, a machine room disposed on the upper frame and mounted with an engine, and the upper frame. A work attachment mounted and driven by a hydraulic cylinder, an operation member for operating the hydraulic cylinder, a cab chamber provided with the operation member therein, and a noise reduction device for reducing noise in the cab chamber And a control means for controlling the operation of the noise reduction device, and the noise reduction device is disposed in the cab chamber, detects the noise, and converts the noise into a noise signal, and a noise detection means. A control signal generator that generates a control signal that can be converted into a control sound that reduces the sound pressure of the noise detected by the noise detection means based on the noise signal. And control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber, the control sound generating means comprising the control sound emitting means and the noise detecting means. A second-order filter that stores a transfer function that is identified in advance, and a coefficient that updates the filter coefficient in accordance with the noise signal so that the sound pressure of the noise detected by the noise detection means is minimized. An update unit; a coefficient storage unit that stores the filter coefficient updated by the coefficient update unit and outputs the filter coefficient; and the control signal based on the filter coefficient and the noise signal output from the coefficient storage unit A control signal generator for generating the hydraulic pressure, the control means between the stroke end and a preset position immediately before a stroke end of the hydraulic cylinder. Provided is a construction machine that digitally sets the volume of control sound emitted from the control sound emitting means to zero when it detects that Linda is located, and stops updating the filter coefficient in the coefficient update unit. To do.

  Also in the present invention, even when an impact sound is generated when the hydraulic cylinder reaches the stroke end, the operator can avoid hearing the control sound mixed with the impact sound. Specifically, the control means digitally zeros the volume of the control sound emitted from the control sound release means immediately before the impact sound is generated, that is, immediately before the hydraulic cylinder reaches the stroke end. In addition, since the update of the filter coefficient in the coefficient update unit is stopped, when an impact sound is generated when the hydraulic cylinder reaches the stroke end, the control sound generating means generates a control sound mixed with the impact sound. The operator can avoid listening to the control sound mixed with the impact sound. Furthermore, since the update of the filter coefficient in the coefficient update unit is stopped at this time, the divergence of the control of the noise reduction device can also be avoided.

  In this case, the control means digitally sets the volume of the control sound emitted from the control sound emission means to zero and stops the update of the filter coefficient in the coefficient update unit, and then at least the immediately preceding position. The volume of the control sound released from the control sound releasing means when it is detected that the hydraulic cylinder is located on the opposite side to the stroke end side than the zero, and the coefficient updating unit It is preferable to restart the update state of the filter coefficient.

  In this way, the volume of the control sound emitted from the control sound emitting means when the hydraulic cylinder is located on the side opposite to the stroke end side with respect to the immediately preceding position is greater than zero, and Since the update state of the filter coefficient in the coefficient update unit is resumed, a steady sound generated from the engine or the like is generated while avoiding the generation of control sound mixed with impact sound and the control divergence of the noise reduction device. It is possible to return to a normal state in which noise is effectively reduced.

  Furthermore, in this case, the control means digitally sets the volume of the control sound emitted from the control sound release means to zero, and after stopping the update of the filter coefficient in the coefficient update unit, the hydraulic cylinder Is detected on the opposite side of the stroke end side from the previous position, and also when the hydraulic cylinder is detected to be displaced toward the opposite side of the stroke end side. It is preferable that the volume of the control sound emitted from the control sound emitting means is made larger than zero and the filter coefficient update state in the coefficient update unit is restarted.

  In this way, the operating state of the noise reduction device can be more reliably improved in the normal state while avoiding the adverse effects on the noise reduction device due to the impact sound generated when the hydraulic cylinder reaches the stroke end. I can return.

  Further, as another means for solving the above-mentioned problems, the present invention relates to a construction machine, which is an upper frame, a machine room disposed on the upper frame and mounted with an engine, and the upper frame. A work attachment mounted and driven by a hydraulic cylinder, an operation member for operating the hydraulic cylinder, a cab chamber provided with the operation member therein, and a noise reduction device for reducing noise in the cab chamber And a control means for controlling the operation of the noise reduction device, and the noise reduction device is disposed in the cab chamber, detects the noise, and converts the noise into a noise signal, and a noise detection means. A control signal generator that generates a control signal that can be converted into a control sound that reduces the sound pressure of the noise detected by the noise detection means based on the noise signal. And control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber, the control sound generating means comprising the control sound emitting means and the noise detecting means. A second-order filter that stores a transfer function that is identified in advance, and a coefficient that updates the filter coefficient in accordance with the noise signal so that the sound pressure of the noise detected by the noise detection means is minimized. An update unit; a coefficient storage unit that stores the filter coefficient updated by the coefficient update unit and outputs the filter coefficient; and the control signal based on the filter coefficient and the noise signal output from the coefficient storage unit A control signal generating unit for generating the hydraulic signal, and the control unit generates a hydraulic signal between the stroke end and a preset position immediately before the stroke end of the hydraulic cylinder. Sunda provides a construction machine for the filter coefficients to zero in the coefficient updating unit when it is detected that the position.

  Also in the present invention, even if an impact sound is generated when the hydraulic cylinder reaches the stroke end, the noise reduction control sound does not generate the control sound mixed with the impact sound, so that the operator listens to the control sound mixed with the impact sound. Can be avoided. Specifically, the control means sets the filter coefficient to zero in the coefficient update unit immediately before the impact sound is generated, that is, immediately before the hydraulic cylinder reaches the stroke end. The control signal obtained by the convolution calculation of the noise signal and the filter coefficient becomes zero. Therefore, the release of the control sound mixed with the impact sound from the control sound emitting means is avoided.

  In this case, when the control means detects that the hydraulic cylinder is located at least on the side opposite to the stroke end side from the immediately preceding position after the filter coefficient is set to zero in the coefficient update unit. It is preferable to restart the update state of the filter coefficient in the coefficient update unit.

  In this way, when the hydraulic cylinder is positioned on the side opposite to the stroke end side with respect to the immediately preceding position, the update state of the filter coefficient in the coefficient update unit is resumed, that is, the control signal generation Since the control unit restarts the generation of the control signal capable of reducing the stationary noise, it is possible to effectively reduce the noise generated from the engine or the like while avoiding the generation of the control sound mixed with the impact sound. .

  Furthermore, in this case, when the control means detects that the hydraulic cylinder is located on the opposite side of the stroke end side from the immediately preceding position after the filter coefficient is set to zero in the coefficient update unit. In addition, it is preferable that the update state of the filter coefficient in the coefficient update unit is restarted even when it is detected that the hydraulic cylinder is displaced toward the side opposite to the stroke end side.

  In this way, the operating state of the noise reduction device can be more reliably improved in the normal state while avoiding the adverse effects on the noise reduction device due to the impact sound generated when the hydraulic cylinder reaches the stroke end. I can return.

  The reason for returning from the control sound generation avoidance state mixed with the impact sound to the normal operation state of the conventional noise reduction device is that the noise signal detected by the noise detection means does not contain an impact sound. Or based on the state of the operating lever or the position of the hydraulic cylinder. The determination of the state of the position of the hydraulic cylinder further includes position detection means for detecting the position of the hydraulic cylinder, and the control means detects the position of the hydraulic cylinder based on information obtained from the position detection means. It may be. In the case of the method of judging based on the position of the hydraulic cylinder, specifically, the control means detects the noise reduction device when detecting that the hydraulic cylinder is located on the opposite side of the stroke end side from the immediately preceding position. Or the zero signal overwriting unit is turned off and the noise signal itself detected by the noise detecting means is input again to the secondary filter and the control signal generation unit, or , Increasing the volume of the control sound emitted from the control sound emitting means to be greater than zero and stopping the update of the filter coefficient in the coefficient updating unit and restarting the update, or the coefficient It is preferable to stop the filter coefficient from being set to zero by the update unit and restart the update state.

  Furthermore, in this case, it may further comprise direction detecting means for detecting the displacement direction of the hydraulic cylinder, and the control means may detect the displacement direction of the hydraulic cylinder based on information obtained from the direction detecting means. .

  As described above, according to the present invention, it is possible to provide a construction machine that can suppress the divergence of the control of the noise reduction device due to the impact sound generated when the hydraulic cylinder of the work attachment reaches the stroke end.

1 is a side view of a hydraulic excavator according to a first embodiment of the present invention. It is a figure which shows the outline of the system of the hydraulic shovel shown in FIG. It is a block diagram which shows the outline | summary of a noise reduction apparatus. It is a flowchart which shows the outline of the control content of the control means of 1st embodiment. It is a figure which shows the outline of the system of the hydraulic excavator of 2nd embodiment of this invention. It is a flowchart which shows the outline of the control content of the control means of 2nd embodiment.

(First embodiment)
A construction machine according to a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a hydraulic excavator 1 is shown as a construction machine.

  As shown in FIGS. 1 and 2, the excavator 1 includes a lower traveling body 2 having a left traveling crawler 2L and a right traveling crawler, and an upper frame 3 provided on the lower traveling body 2 so as to be turnable. In order to operate the machine attachment 4 provided on the upper frame 3 in which an engine (not shown) and the like are disposed, the work attachment 5 provided on the upper frame 3 so as to be raised and lowered, and the work attachment 5 An operation member 10 such as a lever, a cab chamber 11 provided with the operation member 10, a noise reduction device 20 for reducing noise in the cab chamber 11, a position detection means 24 attached to the work attachment 5, Control means 30 for controlling the operation of the noise reduction device 20.

  The work attachment 5 includes a boom 6, an arm 7 connected to the distal end portion of the boom 6, and a bucket 8 that is swingably attached to the distal end portion of the arm 7. The boom 6 is raised and lowered with respect to the upper frame 3 by the expansion and contraction operation of the boom cylinder 9a. The arm 7 swings with respect to the boom 6 by the expansion / contraction operation of the arm cylinder 9b. The bucket 8 swings with respect to the arm 7 by the expansion and contraction operation of the bucket cylinder 9c. Each of the boom cylinder 9a, the arm cylinder 9b, and the bucket cylinder 9c is a hydraulic hydraulic cylinder.

  The noise reduction device 20 generates a control sound that reduces the sound pressure of noise generated from the engine, a fan, a hydraulic pump, or the like (not shown). This noise reduction device 20 is based on a feedback control system. Specifically, the noise reduction device 20 generates a control sound based on a noise detection unit 21 that detects the noise, a control sound generation unit 22 that generates a control signal that can be converted into the control sound, and a control signal. Control sound emitting means 23.

  The noise detection means 21 converts the detected noise into a noise signal and outputs it to the control sound generation means 22. This noise detection means 21 is provided in the vicinity of or around the operator's ear. Note that “near the ear” refers to a region within the movement range of the ear of the operator when the operator operates in a normal posture and in which noise is reduced. Further, “around the ear” refers to the periphery. Examples of the noise detection means 21 include a microphone and a vibration sensor. In the present embodiment, a microphone is used.

  The control sound generator 22 generates a control signal based on the noise signal. As shown in FIG. 3, the control sound generation means 22 includes a secondary filter 22 a that stores a transfer function identified in advance between the control sound emission means 23 and the noise detection means 21, and the noise detection means 21. A coefficient updating unit 22b for sequentially updating the filter coefficient in accordance with the noise signal so that the sound pressure of the noise detected in step S is minimized, and a coefficient storage unit for storing the updated filter coefficient and outputting the filter coefficient 22c, a control signal generation unit 22d that generates the control signal based on the filter coefficient output from the coefficient storage unit 22c and the noise signal, and a noise from the noise detection unit 21 based on a signal from the control unit 30 The signal is input to the secondary filter 22a and the control signal generator 22d as it is, and the OFF state and the noise signal are overwritten with zero, and then the secondary filter 22a and the control are overwritten. Has a zero signal overwritten portion 22e is switched to the OFF state, and an auxiliary coefficient storage unit 22g for inputting the No. generation unit 22d. The control signal generated by the control signal generator 22d is input to the secondary filter 22a and the control signal generator 22d via the secondary control filter 22f. The control signal is obtained by a convolution operation between a signal input to the control signal generation unit 22d and a filter coefficient. As will be described later, when the noise signal input from the noise detection means 21 to the control sound generation means 22 by the control means 30 is overwritten to zero by the zero signal overwriting unit 22e included in the control sound generation means 22, the control signal The generation unit 22d is a noise signal (control signal generated by the control signal generation unit 22d) immediately before including the filter coefficient and the impact sound stored in the coefficient storage unit 22c before the zero signal overwriting unit 22e is turned on. The control signal is continuously generated based on the above. Note that the transfer function between the control sound emitting means 23 and the noise detecting means 21 is identified in advance.

  The control sound emitting means 23 generates a control sound based on the control signal and emits the control sound into the cab chamber 11. In the present embodiment, a speaker is used as the control sound emitting means 23. However, an actuator for driving glass or a panel may be used instead of the speaker. Since the noise detected by the noise detection means 21 is canceled by this control sound, the noise detected by the noise detection means 21, that is, the noise heard by the operator is reduced.

  The position detection means 24 detects the positions of the cylinders 9a to 9c, and is attached to the base end of the boom 6, the joint between the boom 6 and the arm 7, and the joint between the arm 7 and the bucket 8, respectively. ing. In the present embodiment, a potentiometer capable of detecting a rotation angle is used as the position detection unit 24. The position of each cylinder 9a-9c is detected based on the output signal from this potentiometer. The position detector 24 is based on a potentiometer, a linear sensor that directly detects the positions of the cylinders 9a to 9c from the relative positions of the cylinders 9a to 9c, or pressures on both sides of the cylinders 9a to 9c. A sensor that detects the position of the cylinder may be used.

  The control means 30 is connected to the noise reduction device 20 and the position detection means 24. The control means 30 receives the position information of the cylinders 9a to 9c detected by the position detection means 24 at regular intervals, and controls the noise reduction device 20 based on this information. Specifically, the control contents of the control means 30 will be described with reference to FIG. Hereinafter, the boom cylinder 9a is exemplified, but the same applies to the arm cylinder 9b and the bucket cylinder 9c.

  First, the control means 30 receives the position information of the boom cylinder 9a from the position detection means 24 (step ST10). Then, based on the information, it is determined whether or not the boom cylinder 9a is positioned between the stroke end and a preset position immediately before the stroke end of the boom cylinder 9a (step ST11).

  Here, the “immediate position” indicates that the operation of the noise reduction device 20 by the control means 30 is performed even if the boom cylinder 9a is displaced to the stroke end side at the maximum speed (when the input value of the operation member 10 is maximum). It is set to a position where control is in time within the control time required for stop or input from the noise detection means 21 to the control sound generation means 22 and overwriting the noise signal to zero.

  As a result, when it is determined that the boom cylinder 9a is positioned between the immediately preceding position and the stroke end, the control unit 30 is operating the noise reduction device 20 or the zero signal overwriting unit 22e is in an off state. Is determined (step ST12). If the noise reduction device 20 is in operation, or the zero signal overwrite unit 22e is in an off state, that is, the noise signal itself detected by the noise detection unit 21 is being input to the secondary filter 22a and the control signal generation unit 22d. The control unit 30 stops the operation of the noise reduction device 20 or sets the noise signal input from the noise detection unit 21 to the control sound generation unit 22 to zero by switching the zero signal overwrite unit 22e to the on state. Overwriting is performed (step ST13). On the other hand, if the operation of the noise reduction device 20 is stopped or if the zero signal overwrite unit 22e is on, the control means 30 maintains the current operation state of the noise reduction device 20 (step ST14).

  In step ST11, when it is not determined that the boom cylinder 9a is located between the immediately preceding position and the stroke end, the control unit 30 determines whether the noise reduction device 20 is operating or overwrites the zero signal. The operation status of the unit 22e is determined (step ST15). If the noise reduction device 20 is in operation or is in the off state of the zero signal overwrite unit 22e, the control means 30 maintains the current operation state of the noise reduction device 20 (step ST14), while the noise reduction device. If the operation is stopped or the zero signal overwriting unit 22e is on, the control unit 30 restarts the operation of the noise reduction device 20, or switches the zero signal overwriting unit 22e to the off state. Thus, the noise signal itself input from the noise detection unit 21 to the control sound generation unit 22 is input to the secondary filter 22a and the control signal generation unit 22d. (Step ST16).

  In short, when the control means 30 detects that the boom cylinder 9a is located between the immediately preceding position and the stroke end (Yes in step ST11), the noise reduction device 20 is in operation or the zero signal is overwritten. If the unit 22e is in the off state (Yes in step ST12), the operation of the noise reduction device 20 is stopped or the zero signal overwriting unit 22e is switched to the on state to switch the control sound generating unit 22 from the noise detection unit 21. The noise signal input to is overwritten with zero (step ST13). Then, after the operation of the noise reduction device 20 is stopped or the zero signal overwrite unit 22e is switched to the on state (after step ST13), the control means 30 at least moves the boom cylinder 9a from the previous position to the stroke. When it is detected that the position is opposite to the end side (No in step ST11), the operation of the noise reduction device 20 is stopped or the zero signal overwriting unit 22e is on (No in step ST15). The noise signal itself input from the noise detecting means 21 to the control sound generating means 22 by resuming the operation of the noise reducing apparatus 20 or switching the zero signal overwriting unit 22e to the off state is used as the secondary filter 22a. And it is made to input into control-signal production | generation part 22d (step ST16).

  As described above, according to the hydraulic excavator 1 of the present embodiment, the operation of the noise reduction device 20 is stopped immediately before the impact sound is generated, that is, immediately before each of the cylinders 9a to 9c reaches the stroke end, or Since the noise signal input from the noise detection means 21 to the control sound generation means 22 is overwritten to zero by switching the zero signal overwriting unit 22e to the on state, even if the impact sound is generated, Generation of a control sound for canceling the impact sound (a control sound mixed with the impact sound) is avoided. Specifically, when the operation of the noise reduction device 20 is stopped, the control sound mixed with the impact sound is not generated, and the noise signal input from the noise detection means 21 to the control sound generation means 22 is zero. Is overwritten by the control signal generation unit 22d, the signal generated by the control signal generation unit 22d immediately before the noise signal is overwritten with zero (the zero signal overwriting unit 22e is turned on), and this signal A control signal is obtained by a convolution operation with the filter coefficient updated based on the above, and the signal and the filter coefficient are signals generated by the control signal generation unit 22d immediately before the impact sound is generated, that is, Since a signal that does not include the noise signal of the impact sound is used, the control signal similar to that immediately before the impact sound is generated is continuously generated from the control signal generation unit 22d. Therefore, the divergence of control of the noise reduction device 20 is suppressed. In this case, updating of the filter coefficient is stopped, and in the control signal generation unit 22d, the signal generated by the control signal generation unit 22d immediately before the impact sound is generated and the coefficient storage unit immediately before the impact sound is generated. The control signal may be generated based on the filter coefficient stored in 22c.

  Further, the operation of the noise reduction device 20 is restarted when each of the cylinders 9a to 9c is positioned on the side opposite to the stroke end side with respect to the immediately preceding position, or the zero signal overwriting unit 22e is switched to the off state. Thus, the noise signal itself input from the noise detection unit 21 to the control sound generation unit 22 is input to the secondary filter 22a and the control signal generation unit 22d, so that noise generated from the engine or the like is effectively reduced.

(Second embodiment)
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, only the parts different from the first embodiment will be described, and the description of the same structure, operation, and effect as in the first embodiment will be omitted.

  As shown in FIG. 5, the hydraulic excavator 1 according to the present embodiment includes direction detection means 25 that detects the displacement direction of each of the cylinders 9 a to 9 c based on the input value of the operation member 10. For example, as the input value, an electric input signal is used when the operation member 10 is an electric lever, and a pressure value of the operation member system is used when the operation member 10 is a hydraulic lever. The direction detection unit 25 is connected to the control unit 30. That is, the control means 30 of this embodiment controls operation | movement of the noise reduction apparatus 20 based on both the position and displacement direction of each cylinder 9a-9c.

  Specifically, the control contents of the control means 30 will be described with reference to FIG. Hereinafter, the boom cylinder 9a is exemplified, but the same applies to the arm cylinder 9b and the bucket cylinder 9c. The difference between the control contents of the control means 30 of the present embodiment and the control contents of the control means 30 of the first embodiment is that a new step ST17 between step ST11 and step ST12, that is, the input of the operation member 10 is a stroke. It is a point which has the step which the control means 30 judges whether it is an end side. In short, the control means 30 of the present embodiment is such that when the boom cylinder 9a is located between the immediately preceding position and the stroke end (Yes in step ST11), and the input of the operation member 10 is on the stroke end side ( If the noise reduction device 20 is operating or the zero signal overwriting unit 22e is in an off state (Yes in step ST12), the operation of the noise reduction device 20 is stopped or the zero signal overwriting unit 22e. Is switched over to overwrite the noise signal input from the noise detection means 21 to the control sound generation means 22 to zero (step ST13). Even when the boom cylinder 9a is positioned between the immediately preceding position and the stroke end (Yes in step ST11), the input of the operation member 10 is on the opposite side to the stroke end side (step ST17). No), if the operation of the noise reduction device 20 is stopped, or if the zero signal overwriting unit 22e is on (No in step ST15), the operation of the noise reduction device 20 is restarted or overwritten with a zero signal. By switching the unit 22e to the off state, the noise signal itself input from the noise detection unit 21 to the control sound generation unit 22 is input to the secondary filter 22a and the control signal generation unit 22d (step ST16).

  As described above, according to the hydraulic excavator 1 of the second embodiment, when returning from the control sound generation avoidance state in which the impact sound is mixed to the normal noise reduction device operation state, the cylinders 9a to 9c are Noise is detected when it is detected that the cylinders 9a to 9c are displaced toward the side opposite to the stroke end side, in addition to the case where it is detected that the cylinder 9a to 9c is located on the opposite side to the stroke end side. The noise signal itself input from the noise detection means 21 to the control sound generation means 22 by resuming the operation of the reduction device 20 or switching the zero signal overwrite unit 22e to the off state is used as the secondary filter 22a and the control signal. Since it is made to input into the production | generation part 22d, the said noise is reduced more reliably. Specifically, even if each of the cylinders 9a to 9c is positioned between the immediately preceding position and the stroke end, when each of the cylinders 9a to 9c is displaced to the side opposite to the stroke end side, the impact sound is not generated. Therefore, it is possible to avoid the noise reduction device 20 from entering the control sound generation avoidance state mixed with the impact sound, and to return from the control sound generation avoidance state mixed with the impact sound to the normal operation state of the noise reduction device. It can be done promptly.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in each of the above embodiments, the control means 30 stops the operation of the noise reduction device 20 when detecting that the hydraulic cylinder is located between the immediately preceding position and the stroke end, or the zero signal overwriting unit. Although an example in which the switch 22e is turned on is shown, the control means 30 detects the control sound emitted from the control sound release means 23 when detecting that the hydraulic cylinder is located between the immediately preceding position and the stroke end. The volume may be set to zero digitally, and the update of the filter coefficient in the coefficient update unit 22b may be stopped. Even in this case, it is possible to avoid both the listening of the control sound mixed with the impact sound and the divergence of the control of the noise reduction device 20 by the operator. Specifically, in this case, although the control sound generation means 22 generates a control signal mixed with impact sound, the control sound is not output from the speaker or the like into the cab chamber 11 by setting the output volume of the control sound to zero. Since the operator does not hear the control sound mixed with the impact sound, and the filter coefficient is not updated during that time, the control of the noise reduction device 20 does not diverge.

  Alternatively, the control means 30. When it is detected that the hydraulic cylinder is located between the immediately preceding position and the stroke end, the coefficient updating unit 22b may set the filter coefficient to zero. Even in this case, it is possible to avoid both the listening of the control sound mixed with the impact sound and the divergence of the control of the noise reduction device 20 by the operator. Specifically, in this case, although a noise signal mixed with an impact sound is input to the control signal generation unit 22d, the control signal generated by the control signal generation unit 22d becomes zero because the filter coefficient is zero. Therefore, the operator does not hear the control signal mixed with the impact sound. However, it is necessary to newly learn the filter coefficient when the noise reduction device 20 is returned to the normal operation state. For this reason, the auxiliary coefficient storage unit 22g for storing the filter coefficient before being set to zero is connected to the coefficient storage unit 22c, and the auxiliary coefficient storage unit is used when the noise reduction device 20 is returned to the normal operation state. The filter coefficient may be called from 22g and overwritten. In this way, it is possible to reduce the time required to newly learn the filter coefficient after the filter coefficient is set to zero.

  In each of the above embodiments, the control unit 30 detects that the cylinders 9a to 9c are located on the opposite side of the stroke end side from the immediately preceding position, or the cylinders 9a to 9c are An example is shown in which the noise reduction device 20 is returned from the control sound generation avoidance state mixed with the impact sound to the normal noise reduction device operation state when it is detected that the displacement toward the side opposite to the stroke end side is detected. The control means 30 may return the noise reduction device from the control sound generation avoidance state mixed with the impact sound to the normal noise reduction device operation state when each of the cylinders 9a to 9c reaches the stroke end.

  In the second embodiment, the position detector 24 may have the function of the direction detector 25. That is, the displacement direction of each of the cylinders 9a to 9c may be detected based on a change in information detected by the position detection unit 24 with a change in time. In this case, the direction detection means 25 is omitted.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper frame 4 Machine room 5 Work attachment 6 Boom 7 Arm 8 Bucket 9a Boom cylinder (hydraulic cylinder)
9b Arm cylinder (hydraulic cylinder)
9c Bucket cylinder (hydraulic cylinder)
DESCRIPTION OF SYMBOLS 10 Operation member 11 Cab room 20 Noise reduction apparatus 21 Noise detection means 22 Control signal generation means 22a Secondary system filter 22b Coefficient update part 22c Coefficient memory | storage part 22d Control signal generation part 22e Zero signal overwrite part 22f Secondary system control filter 22g Auxiliary Coefficient storage unit 23 Control sound emitting means 24 Position detecting means 25 Direction detecting means 30 Control means

Claims (15)

A construction machine,
An upper frame,
A machine room disposed on the upper frame and mounted with an engine;
A work attachment mounted on the upper frame and driven by a hydraulic cylinder;
An operating member for operating the hydraulic cylinder;
A cab chamber provided with the operation member therein,
A noise reduction device for reducing noise in the cab room;
Control means for controlling the operation of the noise reduction device,
The noise reduction device is disposed in the cab room, detects the noise, converts noise into a noise signal, and controls to reduce the sound pressure of the noise detected by the noise detection means. Control signal generating means for generating a control signal that can be converted into sound based on the noise signal; and control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber. And
The control means stops the operation of the noise reduction device when it detects that the hydraulic cylinder is positioned between the stroke end and a preset position immediately before the stroke end of the hydraulic cylinder. Construction machinery. The construction machine according to claim 1,
The control means resumes the operation of the noise reduction device when detecting that the hydraulic cylinder is located at least on the opposite side of the stroke end side from the previous position after the operation of the noise reduction device is stopped. Construction machinery to do. The construction machine according to claim 2,
The control means, in addition to when the hydraulic cylinder detects that the hydraulic cylinder is located on the opposite side of the stroke end side from the previous position after the operation of the noise reduction device is stopped, A construction machine that resumes the operation of the noise reduction device even when it is detected that it is displaced toward the side opposite the side. A construction machine,
An upper frame,
A machine room disposed on the upper frame and mounted with an engine;
A work attachment mounted on the upper frame and driven by a hydraulic cylinder;
An operating member for operating the hydraulic cylinder;
A cab chamber provided with the operation member therein,
A noise reduction device for reducing noise in the cab room;
Control means for controlling the operation of the noise reduction device,
The noise reduction device is disposed in the cab room, detects the noise, converts noise into a noise signal, and controls to reduce the sound pressure of the noise detected by the noise detection means. Control signal generating means for generating a control signal that can be converted into sound based on the noise signal; and control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber. And
The control signal generation means includes a secondary filter that stores a transfer function identified in advance between the control sound emitting means and the noise detection means, and a sound pressure of the noise detected by the noise detection means. A coefficient updating unit that updates a filter coefficient according to the noise signal so as to be minimized; a coefficient storage unit that stores the filter coefficient updated by the coefficient updating unit and outputs the filter coefficient; and the coefficient storage unit A control signal generating unit that generates the control signal based on the filter coefficient output from the noise signal and the noise signal, an off state in which the noise signal is input to the secondary filter and the control signal generating unit as it is, and the noise A zero signal overwriting unit that can be switched to an on state that is input to the secondary filter and the control signal generation unit after rewriting the signal to zero,
The control means turns on the zero signal overwriting unit when the hydraulic cylinder is located between the stroke end and a preset previous position that is immediately before the stroke end of the hydraulic cylinder. To make construction machinery. The construction machine according to claim 4,
The noise reduction device is a construction machine that inputs a control signal generated by the control signal generator to the secondary filter and the control signal generator via a secondary control filter. In the construction machine according to claim 4 or 5,
When the control means detects that the hydraulic cylinder is positioned at least on the side opposite to the stroke end side from the previous position after the zero signal overwriting unit is turned on, the zero signal overwriting unit A construction machine that puts the machine in the off state. The construction machine according to claim 6,
The control means, in addition to when the hydraulic cylinder is detected to be located on the opposite side of the stroke end side from the previous position after the zero signal overwriting portion is turned on, A construction machine that sets the zero signal overwrite unit to the off state even when it is detected that it is displaced toward the side opposite to the stroke end side. A construction machine,
An upper frame,
A machine room disposed on the upper frame and mounted with an engine;
A work attachment mounted on the upper frame and driven by a hydraulic cylinder;
An operating member for operating the hydraulic cylinder;
A cab chamber provided with the operation member therein,
A noise reduction device for reducing noise in the cab room;
Control means for controlling the operation of the noise reduction device,
The noise reduction device is disposed in the cab room, detects the noise, converts noise into a noise signal, and controls to reduce the sound pressure of the noise detected by the noise detection means. Control signal generating means for generating a control signal that can be converted into sound based on the noise signal; and control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber. And
The control signal generation means includes a secondary filter that stores a transfer function identified in advance between the control sound emitting means and the noise detection means, and a sound pressure of the noise detected by the noise detection means. A coefficient updating unit that updates a filter coefficient according to the noise signal so as to be minimized; a coefficient storage unit that stores the filter coefficient updated by the coefficient updating unit and outputs the filter coefficient; and the coefficient storage unit A control signal generation unit that generates the control signal based on the filter coefficient output from the noise signal,
The control means is discharged from the control sound releasing means when it detects that the hydraulic cylinder is positioned between the stroke end and a preset position immediately before the stroke end of the hydraulic cylinder. A construction machine that digitally reduces the volume of the control sound to zero and stops updating the filter coefficient in the coefficient updating unit. The construction machine according to claim 8,
The control means digitally sets the volume of the control sound emitted from the control sound emission means to zero and stops the update of the filter coefficient in the coefficient update unit, and then at least the stroke from the previous position. The volume of the control sound emitted from the control sound releasing means when it is detected that the hydraulic cylinder is located on the side opposite to the end side is greater than zero, and the filter coefficient in the coefficient update unit Construction machinery to resume the updated state of. The construction machine according to claim 9,
The control means digitally sets the volume of the control sound emitted from the control sound emission means to zero, and after stopping the update of the filter coefficient in the coefficient update unit, the hydraulic cylinder is moved from the immediately preceding position. Is also detected when it is detected that the hydraulic cylinder is displaced toward the side opposite to the stroke end side. A construction machine that increases the volume of the emitted control sound to be greater than zero and restarts the updated state of the filter coefficient in the coefficient update unit. A construction machine,
An upper frame,
A machine room disposed on the upper frame and mounted with an engine;
A work attachment mounted on the upper frame and driven by a hydraulic cylinder;
An operating member for operating the hydraulic cylinder;
A cab chamber provided with the operation member therein,
A noise reduction device for reducing noise in the cab room;
Control means for controlling the operation of the noise reduction device,
The noise reduction device is disposed in the cab room, detects the noise, converts noise into a noise signal, and controls to reduce the sound pressure of the noise detected by the noise detection means. Control signal generating means for generating a control signal that can be converted into sound based on the noise signal; and control sound emitting means for converting the control signal into the control sound and emitting the control sound into the cab chamber. And
The control signal generation means includes a secondary filter that stores a transfer function identified in advance between the control sound emitting means and the noise detection means, and a sound pressure of the noise detected by the noise detection means. A coefficient updating unit that updates a filter coefficient according to the noise signal so as to be minimized; a coefficient storage unit that stores the filter coefficient updated by the coefficient updating unit and outputs the filter coefficient; and the coefficient storage unit A control signal generation unit that generates the control signal based on the filter coefficient output from the noise signal,
The control unit detects the filter coefficient in the coefficient update unit when it detects that the hydraulic cylinder is positioned between a preset immediately preceding position that is immediately before the stroke end of the hydraulic cylinder and the stroke end. Construction machinery to zero. The construction machine according to claim 11,
The controller updates the coefficient updating unit when the coefficient updating unit detects that the hydraulic cylinder is positioned at least on the opposite side of the stroke end side from the immediately preceding position after the filter coefficient is set to zero in the coefficient updating unit. Construction machinery which resumes the updated state of the filter coefficient at The construction machine according to claim 12,
The control means adds the hydraulic cylinder when detecting that the hydraulic cylinder is located on the opposite side of the stroke end side from the immediately preceding position after the filter coefficient is set to zero in the coefficient updating unit. A construction machine that resumes the updated state of the filter coefficient in the coefficient update unit even when it is detected that the valve is displaced toward the side opposite to the stroke end side. The construction machine according to any one of claims 1 to 13,
Further comprising position detecting means for detecting the position of the hydraulic cylinder;
The control means is a construction machine that detects the position of the hydraulic cylinder based on information obtained from the position detection means. In the construction machine according to any one of claims 3, 7, 10 or 13,
Direction detecting means for detecting the displacement direction of the hydraulic cylinder,
The control means is a construction machine that detects a displacement direction of the hydraulic cylinder based on information obtained from the direction detection means.

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