Abnormal operation detection device

• US 8,509,999 B2
• Filed: 01/27/2009
• Issued: 08/13/2013
• Est. Priority Date: 01/30/2008
• Status: Active Grant

• Current Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Inventors: Suzuki, Hideaki, Furuno, Yoshinori, Shibata, Kouichi
• Primary Examiner(s): Shaawat, Mussa A
• Application Number:
  US12/865,274
• Publication Number:
  US 20110010059A1
• Time in Patent Office: 1,659 Days
• Field of Search: None
• US Class Current: 701/50
• CPC Class Codes: E02F 9/24 Safety devices , e.g. for preventing overload E02F9/226 takes precedence
• CPC Class Codes: E02F 9/26 Indicating devices E02F5/145 takes precedence
• CPC Class Codes: E02F 9/267 Diagnosing or detecting failure of vehicles

Abstract

The invention provides an abnormal operation detection device estimating an overload operation of a hydraulic shovel on the basis of an amount of hydraulic operation. An accumulated amount of an operation amount is calculated by an accumulated amount calculating means on the basis of an operation amount of each of operation mechanisms obtained by an operation pressure detecting means, an operation fluctuation amount is calculated by a fluctuation amount calculating means, a joint angle of each of the operation mechanisms is estimated on the basis of the accumulated amount, and an overload operation is determined by using an abnormal operation determining means on the basis of the estimated joint angle and the operation fluctuation amount.

Claims

1. An abnormal operation detection device of a machine provided with an operation mechanism for excavating, comprising:

an operation measuring device that measures a hydraulic operation pressure transmitting plural kinds of operation commands of an operator to said operation mechanism;

an integrated amount calculating device that calculates an integrated value in time direction with regard to the hydraulic operation pressure on the basis of a coefficient in correspondence to kind of work of a plurality of said operation mechanisms;

a fluctuation amount calculating device that calculates a fluctuation amount of the hydraulic operation pressure;

an operation position estimating device that estimates an operation position of an arm of said operation mechanism on the basis of said integrated value, wherein said estimated operation position is calculated by multiplying said integrated value of each of the operation pressures by the coefficient set per operation pressure in accordance with the kind of the work, and adding in the case of the rising (dump) operation or subtracting in the case of the falling (crowd) operation; and

an abnormal operation detecting device that detects an overload operation of said machine on the basis of said estimated operation position and said fluctuation amount;

wherein in calculation of said estimated operation position it is determined whether or not a joint output is beyond a previously set threshold value, If said joint output is beyond the threshold value, then an attitude flag is scraped down;

wherein in calculation of said estimated operation position it is further determined whether or not a total of the fluctuation amount of the of the hydraulic operation pressure is beyond a previously set threshold value, if the total of the fluctuation amount of the hydraulic operation pressure is beyond the threshold value than the overload operation is carried out, and outputs to an external portion of the abnormal operation detecting device.

3. An abnormal operation detection device as claimed in claim 1, further comprising an abnormal operation storage device that stores an overload operation of said machine while adding a date in a memory device provided in the device or connected thereto, at a time of detecting the overload operation.

4. An abnormal operation detection device as claimed in claim 1, further comprising an informing device that informs an operator of the detection of the overload operation of said machine, at a time of detecting the overload operation.

5. An abnormal operation detection device as claimed in claim 1, further comprising a message device that informs an external portion of the detection of the overload operation of said machine by using a communication device connected to the abnormal operation detection device, at a time of detecting the overload operation.

6. An abnormal operation detection device as claimed in claim 1, wherein the abnormal operation detection device carries out an initialization of said estimated operation position or said estimated angle of said machine.

2. An abnormal operation detection device of a hydraulic shovel for excavating, comprising:

a hydraulic operation measuring device that measures a hydraulic operation pressure transmitting plural kinds of operation commands of an operator;

an integrated amount calculating device that calculates an integrated value in time direction with regard to the hydraulic operation pressure on the basis of a coefficient in correspondence to kind of work of a plurality of said hydraulic operation mechanisms;

a fluctuation amount calculating device that calculates a fluctuation amount of the hydraulic operation pressure;

an angle estimating device that estimates a joint angle or a turning angle of said hydraulic shovel on the basis of said integrated value, wherein said angle is calculated by multiplying said integrated value of each of the operation pressures by the coefficient set per operation pressure in accordance with the kind of the work, and adding in the case of the rising (dump) operation or subtracting in the case of the falling (crowd) operation; and

an abnormal operation detecting device that detects an overload operation of said hydraulic shovel on the basis of an estimated angle by said angle estimating device and said fluctuation amount;

wherein in calculation of said joint angle it is determined whether or not a joint output is beyond a previously set threshold value, If said joint output is beyond the threshold value, then an attitude flag is scraped down;

wherein in calculation of said joint angle it is further determined whether or not a total of the fluctuation amount of the of the hydraulic operation pressure is beyond a previously set threshold value, if the total of the fluctuation amount of the hydraulic operation pressure is beyond the threshold value than the overload operation is carried out, and outputs to an external portion of the abnormal operation detecting device.

11. An abnormal operation detection device as claimed in claim 2, further comprising an abnormal operation storage device that stores an overload operation of said hydraulic shovel while adding a date in a memory device provided in the device or connected thereto, at a time of detecting the overload operation.

12. An abnormal operation detection device as claimed in claim 2, further comprising an informing device that informs an operator of the detection of the overload operation of said hydraulic shovel, at a time of detecting the overload operation.

13. An abnormal operation detection device as claimed in claim 2, further comprising a message device that informs an external portion of the detection of the overload operation of said hydraulic shovel by using a communication device connected to the abnormal operation detection device, at a time of detecting the overload operation.

14. An abnormal operation detection device as claimed in claim 2, wherein the abnormal operation detection device carries out an initialization of said estimated operation position or said estimated angle of said hydraulic shovel.

7. An abnormal operation detection device of a machine provided with an arm operation mechanism by a hydraulic pressure, comprising:

a device that estimates a joint angle of the arm on the basis of an integrated value in time direction with regard to the hydraulic pressure transmitted to said operation mechanism; and

an operation position estimating device that estimates an operation position of an arm of said operation mechanism on the basis of said integrated value, wherein said estimated operation position is calculated by multiplying said integrated value of each of the operation pressures by the coefficient set per operation pressure in accordance with the kind of the work, and adding in the case of the rising (dump) operation or subtracting in the case of the falling (crowd) operation;

an abnormal operation determining device that measures a fluctuation amount of the hydraulic pressure so as to detect with or without an overload operation, in the case that an estimated joint angle satisfies a fixed condition;

wherein in calculation of said joint angle it is determined whether or not a joint output is beyond a previously set threshold value, If said joint output is beyond the threshold value, then an attitude flag is scraped down;

wherein in calculation of said joint angle it is further determined whether or not a total of the fluctuation amount of the of the hydraulic operation pressure is beyond a previously set threshold value, if the total of the fluctuation amount of the hydraulic operation pressure is beyond the threshold value than the overload operation is carried out, and outputs to an external portion of the abnormal operation detecting device.

8. An abnormal operation detection device as claimed in claim 7, wherein the abnormal operation detection device carries out an initialization of the device that estimates the joint angle of said arm.

9. An abnormal operation detection device as claimed in claim 7, further comprising an abnormal operation storage device that stores the detection of said overload operation while adding a data in a storage device provided within the apparatus or connected thereto, at a time of detecting said overload operation.

10. An abnormal operation detection device as claimed in claim 7, further comprising an informing device that informs an operator of the detection of said overload operation, at a time of detecting said overload operation.