JP2001049698A - Trouble diagnosis method for electric lever device and hydraulic drive controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely detect troubles of an electric lever device without deteriorating detecting accuracy even in a rapid lever operation in a hydraulic drive controller for a hydraulic machine. SOLUTION: An electric lever device 13 is diagnosed as disorder and processed by interruption against a main processing operating and outputting a drive signal in compliance with a control signal X1 in a control unit 12. The disorder diagnosis and processing is executed at a rate of 100 times/s through a built-in timer in the control unit 12. It is discriminated as an disorder condition if the condition continues for 1.0 s after abnormality discrimination such as X1>V2 (the operation lever is in non-neutral position, N=Hi (the operation lever 12a is in the neutral position.) or X1<V1 (the operation lever is in the neutral position), N=Lo (the control lever 13a is in the non-neutral position), which are temporarily brought due to input and output delay of neutral position detection signal N from a neutral position detector 20 caused by rapid operation of the operation lever 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic machine such as a hydraulic shovel, which outputs an electric operation signal corresponding to an operation amount of an operation lever by operating an operation lever of an electric lever device, and The present invention relates to a failure diagnosis method and a hydraulic drive control device for an electric lever device in a hydraulic drive control device that drives an actuator.

[0002]

2. Description of the Related Art In a hydraulic drive control device for a hydraulic machine such as a hydraulic shovel equipped with an electric lever device, an electric operation signal output from the electric lever device is transmitted via a control unit to an electric hydraulic pressure control device such as an electromagnetic proportional pressure reducing valve. By operating the converter, it is converted into a hydraulic signal (pilot pressure), and the hydraulic signal is used to switch the flow control valve to control the operation of the hydraulic actuator. In such a hydraulic drive control device for a hydraulic machine, there is a "drive control device for an actuated body" described in Japanese Patent No. 2577551 as a device for detecting a failure of an electric lever device. This drive control device is a command input device (electric lever device) having a potentiometer that generates an electric operation signal according to the operation amount of the operation lever.
A control operation unit that calculates a drive signal to an electric actuator (electromagnetic proportional pressure reducing valve) based on the operation signal, and a neutral detector that detects a neutral position of the operation lever. Then, in addition to calculating the drive signal, the control calculation unit inputs a signal from the neutral detector and diagnoses an abnormality of the command input device as follows.

In the control operation unit, two values of V1 and V2 are set with respect to an operation signal from the command input device with respect to a position where an operation lever of the command input device switches from a neutral position to a non-neutral position. , The time when the signal of the neutral detector is switched from the neutral position to the non-neutral position or vice versa, and if the operation signal is not within the range of the above two set values at that time, the potentiometer or the neutral detector is abnormal (electrical (The lever device is out of order), the drive signal is set to zero, and the machine is forcibly stopped.

[0004]

However, in the above-mentioned prior art, there is a problem that the accuracy of the abnormality diagnosis is deteriorated due to a delay in signal processing for an early input operation.

That is, when the operation lever is quickly operated from the neutral position to the non-neutral position, the signal of the neutral detector is originally neutral due to a delay in the data input of the control operation unit and a delay in the signal output of the neutral detector. When the operation signal should be between V1 and V2 when the position changes from the position to the non-neutral position, there is a possibility that the operation signal is not between V1 and V2.
The same applies when the lever is quickly returned from the non-neutral position to the neutral position. As a result, the command input device (potentiometer) may be erroneously determined to be abnormal even though it is normal, and the machine may be forcibly stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to diagnose a failure of an electric lever device in a hydraulic drive control device of a hydraulic machine capable of reliably detecting a failure of an electric lever device without deteriorating detection accuracy even for quick lever operation. Is to provide a way.

[0007]

(1) In order to achieve the above object, the present invention provides an operation signal output means for outputting an electric operation signal according to an operation amount of an operation lever, and a neutralization of the operation lever. An electric lever device having a neutral position detecting means for detecting a position, a control means for outputting a drive signal for driving the electromagnetic proportional pressure reducing valve based on the operation signal, and a pilot pressure output from the electromagnetic proportional pressure reducing valve A pilot-operated flow control valve for controlling the flow rate of pressurized oil supplied to the hydraulic actuator, a pilot pump, and an electromagnetic proportional pressure reducing valve for reducing and outputting the pilot pressure output from the pilot pump. In the method of diagnosing a failure of the electric lever device in the hydraulic drive control device, the operation signal of the operation signal output means and the neutral position detection The operation signal from the signals to determine whether an abnormal, abnormal state is assumed to determine that the to continue a predetermined time electric lever device has failed.

In this way, it is determined from the operation signal of the operation signal output means and the signal of the neutral position detector whether or not the operation signal is abnormal, and if the abnormal state continues for a predetermined time, the electric lever device has failed. By doing so, erroneous detection due to a delay in the signal output of the neutral position detector or the like does not occur for a quick lever operation, and a failure of the electric lever device can be reliably determined.

(2) In the above (1), preferably,
A failure determination value based on a first value corresponding to a boundary of a neutral position of the operation lever is set in advance in an operation signal of the operation signal output unit, and the operation signal is larger than the failure determination value and the neutral position If the signal from the detecting means indicates the neutral position, the operation signal is determined to be abnormal.

Thus, when the operating lever of the electric lever device is quickly moved from the neutral position to the non-neutral position, erroneous detection due to a delay in the signal output of the neutral position detector does not occur, and the abnormality of the operating signal is reliably determined. can do.

(3) In the above (2), preferably,
As the failure determination value, a second value having an absolute value larger than the first value in the operation signal is used.

Thus, it is possible to prevent erroneous detection from occurring due to variation in output or aging due to an attachment error or the like of the operation signal output means, and it is possible to more reliably determine the failure of the electric lever device.

(4) In order to achieve the above object,
The present invention provides an electric lever device including an operation signal output unit that outputs an electric operation signal corresponding to an operation amount of an operation lever, and a neutral position detection unit that detects a neutral position of the operation lever, Control means for outputting a drive signal for driving the electromagnetic proportional pressure-reducing valve based on a pilot pressure output from the electromagnetic proportional pressure-reducing valve, and a pilot-operated flow rate control for controlling the flow rate of pressure oil supplied to the hydraulic actuator A hydraulic pump control device for a hydraulic machine, comprising a valve, a pilot pump, and an electromagnetic proportional pressure reducing valve for reducing and outputting a pilot pressure output from the pilot pump. It is determined from the signal of the position detection means whether the operation signal is abnormal, and when the abnormal state continues for a predetermined time, Failure determination means for determining that the pneumatic lever device has failed; and drive stop means for setting a drive signal for driving the electromagnetic proportional pressure reducing valve to zero when the failure determination means determines that a failure has occurred. I do.

As described above, it is determined whether or not the operation signal is abnormal based on the operation signal of the operation signal output means and the signal of the neutral position detector. If the abnormal state continues for a predetermined time, the electric lever device is broken. By doing so, erroneous detection due to a delay in the signal output of the neutral position detector or the like does not occur for a quick lever operation, and a failure of the electric lever device can be reliably determined.

(5) In the above (4), preferably,
The failure determination means sets a failure determination value based on a first value corresponding to a boundary of a neutral position of the operation lever in advance in an operation signal of the operation signal output means, and the operation signal is the failure determination value. If the signal is larger and the signal from the neutral position detecting means indicates the neutral position, it is determined that the operation signal is abnormal.

Thus, when the operating lever of the electric lever device is quickly moved from the neutral position to the non-neutral position, an erroneous detection due to a delay in the signal output of the neutral position detector does not occur, and the abnormality of the operating signal is reliably determined. can do.

(6) In the above (5), preferably,
The failure determination means uses a second value having an absolute value larger than the first value in the operation signal as the failure determination value.

Thus, it is possible to prevent erroneous detection due to variation in output or aging due to an attachment error or the like of the operation signal output means, and it is possible to more reliably determine a failure of the electric lever device.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of a hydraulic drive control device of a hydraulic machine, for example, a hydraulic shovel. In FIG. 1, a hydraulic drive control device according to the present embodiment includes a prime mover 3 and a prime mover 3
Hydraulic pump 1 and pilot pump 2 driven by a hydraulic pump, an actuator 9 driven by hydraulic oil discharged from the main hydraulic pump 1, and a pilot operation for controlling a flow of hydraulic oil supplied from the main hydraulic pump 1 to the actuator 9 And a flow control valve 8. The switching of the pilot operated flow control valve 8 is controlled by an operation system including an electric lever device 13.

The electric lever device 13 includes an operation lever 13a.
When the operation lever 13a is operated, a potentiometer 14 that outputs an operation signal X1 that is a voltage corresponding to the operation amount, a neutral position of the operation lever 13a is detected, and a neutral position detection signal N is output. Neutral position detector 20
It consists of

The operation signal X1 from the potentiometer 14 and the neutral position detection signal N from the neutral position detector 20 in the electric lever device 13 are input to the control unit 12,
The control unit 12 calculates and outputs a drive signal for driving the electromagnetic proportional pressure reducing valves 10 and 11 from the operation signal X1 and the neutral position detection signal N. The electromagnetic proportional pressure reducing valves 10 and 11 reduce the pilot pressure output from the pilot pump 2 according to the drive signal from the control unit and output the same, thereby controlling the pilot-operated flow control valve 8.

The pilot-operated flow control valve 8 controls the flow rate of the pressure oil from the main hydraulic pump 1, supplies the controlled pressure oil to the actuator 9, and drives the actuator 9 to drive the hydraulic shovel to a predetermined pressure. Do the work.

Here, although one actuator is omitted in FIG. 1, a hydraulic machine such as a hydraulic shovel actually has a plurality of actuators such as a bucket cylinder, a boom cylinder, and a traveling motor. An operation system including a similar pilot-operated flow control valve and an electric lever device for controlling the same is also provided for the actuator.

In an actual machine, the electric lever device 1
Reference numeral 3 denotes a single operating lever which can drive two actuators. For example, the hydraulic cylinder 9 can be driven by operating the operating lever 13a in the left-right direction along the plane of FIG. By operating the operation lever 13a in the front-rear direction perpendicular to the plane of FIG. 1, another actuator (not shown) such as a bucket cylinder can be driven, and the operation lever of another electric lever device (not shown) can be operated. Thus, another actuator (not shown) can be driven.

The main hydraulic pump 1 is a variable displacement pump having a swash plate 1a for changing the discharge amount thereof.
And a pressure detector 6 for detecting the discharge pressure of the main hydraulic pump 1. The control unit 15 performs a predetermined calculation based on the discharge pressure of the main hydraulic pump 1 detected by the pressure detector 6 and the tilt position of the swash plate 1a detected by the swash plate position detector 4, A control signal is output to the swash plate position adjuster 5 of the hydraulic pump 1 to adjust the position of the swash plate 1a and control the displacement of the main hydraulic pump 1, that is, the discharge flow rate.

FIG. 2 shows the configuration of the control unit 12 related to the electric lever device 13. The control unit 12 is a read-only memory (ROM) for storing a program for a control / failure diagnosis procedure and constants necessary for the control / failure diagnosis processing.
21, timer 22 for measuring time, central processing unit (CPU) 23, operation signal X1 of potentiometer 14
An A / D converter 24 for converting the neutral position detection signal N into a digital signal; a random access memory (RAM) 25 for temporarily storing a pilot pressure sensor calculation result or a numerical value during calculation; A D / A converter 26 for converting a signal into an analog signal;
It comprises amplifiers 30 and 31 for outputting signals from the A converter 26 to the electromagnetic proportional pressure reducing valves 10 and 11.

The processing contents of the control unit 12 will be described with reference to the flowcharts of FIGS. 3 and 4 and the characteristic diagram of FIG.

The control unit 12 performs an interrupt process as shown in the flowchart of FIG. 4 for the main process as shown in the flowchart of FIG. In the main process, a drive signal corresponding to the operation signal X1 is calculated and output, and in the interrupt process, a failure of the electric lever device 13 is diagnosed (hereinafter, referred to as a failure diagnosis process). The interrupt failure diagnosis process is executed at a rate of 100 times / s by a timer 22 built in the control unit 12.

First, the contents of the main processing will be described with reference to FIG.

Process 3-1: The operation signal X1 output from the potentiometer 14 of the electric lever device 13 is converted into a digital signal by the A / D converter 24 and input. Operation signal X1
Is a voltage that increases according to the operation amount L of the operation lever 13a of the electric lever device 13, as shown in FIG.

Process 3-2: If there is a rewrite command (to be described later) by the interrupt failure diagnosis process for the operation signal X1 inputted in the process 3-1, the rewrite process is performed.

Process 3-3: A command signal corresponding to the operation signal X1 is transmitted via the amplifiers 30 and 31 to the electromagnetic proportional pressure-reducing valves 10 and 1.
1 as a drive signal. Next, the contents of the failure diagnosis processing will be described with reference to FIG.

Process 4-1: Operation signal X1 from potentiometer 14 of electric lever device 13 and neutral position detector 2
The neutral position detection signal N from 0 is converted into a digital signal by the A / D converter 24 and input. As described above, the operation signal X1 is a voltage corresponding to the operation amount L of the operation lever 13a, and the effective voltage range corresponding to the entire operation range of the operation lever 13a is 0.5 V as shown in FIG. ４4.5V. That is, when the operation amount of the operation lever 13a is zero, X1
= 0.5V and X1 when the operation amount is a full stroke
= 4.5V. The maximum voltage of the operation signal X1 is 5
V. When the operation lever 13a is at the neutral position as shown in FIG.
i "and" Lo "when the operation lever 13a is operated.
Becomes In FIG. 5A, boundaries of the neutral position of the operation lever 13a are indicated by L1 and L3, and the operation signal X1 at that time is shown.
Is the voltage V1. Also, corresponding to this, the operation lever 1
3a is between L1 and L3 (the operation signal X1 is V1
Below), the neutral position detection signal N indicates "Hi", and when the operation amount L of the operation lever 13a is L1 or more or L3 or less (the operation signal X1 is V1 or more), the neutral position detection signal N
Indicates "Lo".

Process 4-2: If the result of the previous execution of the fault diagnosis process is a fault condition (described later), the process proceeds to process 4-8, and if not, the process proceeds to process 4-3a.

Process 4-3a: It is determined whether the input operation signal X1 is within the valid voltage range by X1 <0.25V or X1.
It is determined by whether or not> 4.75V. Here, the threshold values of 0.25 V and 4.75 V are determined by the potentiometer 14.
In consideration of the variation in output and aging due to the mounting error and the like, a dead band width is provided for the boundary values 0.5V and 4.5V within the effective voltage range. If X1 <0.25V, a potentiometer is used. 14 is disconnection, X1> 4.75V
If so, since the potentiometer 14 may be short-circuited, the operation signal X1 is determined to be abnormal, and the processing 4-
The process proceeds to 4a, otherwise proceeds to process 4-3b.

Process 4-4a: If the operation signal X1 is not determined to be abnormal in the process 4-3a at the time of executing the previous failure diagnosis process, the process proceeds to the process 4-5a, and if it is determined to be abnormal, the process is performed. Proceed to 4-6a.

Processing 4-5a: Time measurement is started, and processing 4
Go to -6a.

Process 4-6a: 0.2 seconds from the start of time measurement
If the elapsed time has elapsed, it is determined that the potentiometer 14 is disconnected or short-circuited, and the process proceeds to Step 4-7a. If the elapsed time is less than 0.2 s, the process proceeds to Step 4-3b.

Process 4-7a: A command for rewriting the operation signal X1 to zero is issued.

Process 4-3b: It is determined whether X1> V2 and N = Hi from the input operation signal X1 and the neutral position detection signal N. Here, V2 is a value slightly larger than V1, and in consideration of output variations and aging due to mounting errors of the potentiometer 14, etc., the operation lever 13a is taken into consideration.
Are the voltages corresponding to the threshold values L2 and L4 which provide the dead zone width with respect to the boundary values L1 and L3 of the neutral position. X1> V2
When N = Hi, that is, when the operation signal X1 is larger than the voltage V2 corresponding to the operation amounts L2 and L4 of the operation lever 13a and the neutral position detection signal N indicates "Hi" in the neutral state, the operation signal It is determined that X1 is abnormal, and processing 4
Go to -4b.

Process 4-4b: If the operation signal X1 is not determined to be abnormal in the process 4-3b at the time of execution of the previous failure diagnosis process, the process proceeds to the process 4-5b, and if it is determined to be abnormal, the process 4-4 Proceed to -6b.

Processing 4-5b: Time measurement is started, and processing 4
Proceed to -6b.

Process 4-6b: 1.0 s from start of time measurement
If the elapsed time has elapsed, it is determined that a failure has occurred, and the process proceeds to processing 4-7b. If the elapsed time is less than 1.0 s, the failure diagnosis processing ends.

Process 4-7b: A command for rewriting the operation signal X1 to zero is issued.

Process 4-8: Instruct rewrite process to set operation signal X1 to zero.

In this embodiment, if the operation signal X1 is initially determined to be abnormal in the process 4-6b and the state continues for 1.0 second, it is determined to be a failure state.
The value may be different or variable depending on the delay of the operation of the control unit, the configuration of the neutral position detector, and the like.

Next, the operation of the present embodiment configured as described above will be described.

1) When the electric lever device 13 fails I (when the potentiometer 14 is disconnected or short-circuited) When the potentiometer 14 fails, for example, when it is short-circuited,
Since X1 = 5 V and X1> 4.75 V, if the state continues for 0.2 s, a rewriting process for setting the operation signal X1 to zero in the failure diagnosis process in the first half of the interrupt process of FIG. 1 → Process 4-2 → Process 4-3a → Process 4-4a → Process 4-5a → Process 4-6a → Process 4-7a
→ End). Therefore, in the main processing of FIG.
The rewriting process for setting 1 to zero is performed, and the operation of the actuator by the operation signal X1 becomes impossible, so that malfunction of the machine can be prevented. When the potentiometer 14 is disconnected, X1 =
0 V and X1 <0.25 V, so if the state continues for 0.2 s, a rewrite process for setting the operation signal X1 to zero in the failure diagnosis process in the first half of the interrupt process is similarly commanded (process 4-1 → Process 4-2 → Process 4-3a → Process 4-
4a → process 4-5a → process 4-6a → process 4-7a → end). Therefore, malfunction of the machine can be similarly prevented.

2) When the electric lever device 13 fails II (when the operation signal X1 is disconnected or abnormal other than short circuit) The output characteristic is deviated by the disconnection or short circuit of the potentiometer 14 and the operation signal X1 is larger than the normal value. When the output is performed, X1> V2 may be satisfied even when the operation lever 13a is returned to the neutral position. In this case, X1
Since N = Hi at> V2, if the state continues for 1.0 s, a rewriting process for setting the operation signal X1 to zero is instructed in the failure diagnosis process in the latter half of the interrupt process of FIG. 4 (process 4).
-1 → Process 4-2 → Process 4-3a → Process 4-3b → Process 4-4b → Process 4-5b → Process 4-6b → Process 4-7b
→ End). Therefore, in the main processing of FIG.
The rewriting process for setting 1 to zero is performed, and malfunction of the machine can be prevented. Even if the operation amount is equal to or less than L1 and the operation signal X1 is V1 <X1 <V2 due to variation in output or aging due to the mounting error of the potentiometer 14 or the like, it is determined that the operation is normal in that case, thereby preventing erroneous detection. Is done.

3) When the electric lever device 13 is normal When the electric lever device 13 is normal, X1> V2, N =
4 and the rewriting process of the operation signal X1 is not instructed in the interrupt process of FIG. 4 (process 4-1 → process 4-2 → process 4).
-3a → process 4-3b → end), a drive signal corresponding to the operation signal X1 is output, and the actuator can be operated according to the operation of the operation lever 13a. Operation lever 1
If the 3a is operated quickly, even when the electric lever device 13 is normal, there may be a case where X1> V2 and N = Hi temporarily due to a delay in the input or output of the neutral position detection signal N. in this case,
In the failure diagnosis processing in the latter half of the interruption processing of FIG. 4, it is determined that the operation is abnormal. However, if 1.0 s has not elapsed after the start of the time measurement, the rewriting processing for setting the operation signal X1 to zero is not instructed (processing 4- 1 → Process 4-2 → Process 4-3a → Process 4
-3b → Process 4-4b → Process 4-5b → Process 4-6b →
(End), in the main processing of FIG. 3, the output of the drive signal corresponding to the operation signal X1 is continued. For this reason, erroneous detection is prevented, and the actuator can be operated in accordance with the operation of the operation lever 13a.

As described above, in the present embodiment, it is possible to reliably detect a failure such as disconnection, short circuit, or abnormal output characteristics of the potentiometer 14 of the electric lever device 13, and to prevent a malfunction or stop of the machine. Prevention and high safety can be ensured.

Further, for example, in a "mud dropping operation" in which the bucket is moved little by little to shake off mud stuck to the bucket, or in a "rolling operation" in which the back portion of the bucket is continuously pressed against the ground and the ground is compacted. In response to the quick lever operation that is performed, erroneous detection can be prevented, and a situation in which the machine is stopped even though the electric lever device 13 is functioning normally can be prevented.

[0054]

According to the present invention, it is determined whether or not the operation signal is abnormal based on the operation signal and the signal of the neutral position detector, and if the abnormal state continues for a predetermined time, the electric lever device is determined to have failed. Since the determination is made, the failure of the electric lever device can be reliably detected without lowering the detection accuracy even for quick lever operation.

[Brief description of the drawings]

FIG. 1 is a hydraulic drive circuit diagram according to the present invention.

FIG. 2 is a configuration diagram of a control unit shown in FIG.

FIG. 3 is a flowchart showing main processing contents of a control unit.

FIG. 4 is a flowchart showing processing contents of the control unit according to the present invention.

FIG. 5 is a diagram showing a relationship between an operation signal of an electric lever device and a signal of a neutral position detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main hydraulic pump 2 Pilot pump 3 Prime mover 4 Swash plate position detector 5 Swash plate position adjuster 6 Pressure detector 8 Pilot operated flow control valve 9 Actuator 10, 11 Electromagnetic proportional pressure reducing valve 12 Control unit 13 Electric lever device 13a Operation Lever 14 Potentiometer 15 Control unit 20 Neutral position detector 21 Read only memory (ROM) 22 Timer 23 Central processing unit (CPU) 24 A / D converter 25 Random access memory (RAM) 26 D / A converter 30, 31 amplifier

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masakazu Haga 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. Construction Machinery Co., Ltd. Tsuchiura Plant F-term (reference) 2D003 AA01 BA07 BA08 CA03 DA03 DA04 DB04 EA02

Claims (6)

[Claims] 1. An electric lever device comprising: an operation signal output means for outputting an electric operation signal according to an operation amount of an operation lever; and a neutral position detection means for detecting a neutral position of the operation lever; Control means for outputting a drive signal for driving the electromagnetic proportional pressure-reducing valve based on a pilot operation-type flow rate controlled by a pilot pressure output from the electromagnetic proportional pressure-reducing valve and controlling the flow rate of pressure oil supplied to the hydraulic actuator A failure diagnosis method for an electric lever device in a hydraulic drive control device including a control valve, a pilot pump, and an electromagnetic proportional pressure reducing valve configured to reduce and output a pilot pressure output from the pilot pump; It is determined whether or not the operation signal is abnormal based on the operation signal of When the state continues for a predetermined time, it is determined that the electric lever device has failed. 2. A failure diagnosis method for an electric lever device according to claim 1, wherein a failure determination value based on a first value corresponding to a boundary of a neutral position of said operation lever is previously stored in said operation signal of said operation signal output means. Setting the operation signal to be abnormal when the operation signal is larger than the failure determination value and the signal from the neutral position detecting means indicates the neutral position. Device failure diagnosis method. 3. A failure diagnosis method for an electric lever device according to claim 2, wherein a second value having an absolute value larger than said first value in said operation signal is used as said failure determination value. Failure diagnosis method for electric lever device. 4. An electric lever device comprising: operation signal output means for outputting an electric operation signal according to an operation amount of an operation lever; and neutral position detection means for detecting a neutral position of the operation lever; Control means for outputting a drive signal for driving the electromagnetic proportional pressure-reducing valve based on a pilot operation-type flow rate controlled by a pilot pressure output from the electromagnetic proportional pressure-reducing valve and controlling the flow rate of pressure oil supplied to the hydraulic actuator A hydraulic drive control device for a hydraulic machine, comprising: a control valve, a pilot pump, and an electromagnetic proportional pressure reducing valve configured to reduce and output a pilot pressure output from the pilot pump. From the signal of the neutral position detecting means, it is determined whether or not the operation signal is abnormal. Failure determination means for determining that the electric lever device has failed, and drive stop means for setting a drive signal for driving the electromagnetic proportional pressure reducing valve to zero when the failure determination means determines that a failure has occurred. A hydraulic drive control device characterized by the following. 5. The hydraulic drive control device according to claim 4, wherein the failure determination means includes a first signal corresponding to an operation signal of the operation signal output means corresponding to a boundary of a neutral position of the operation lever.
A failure determination value based on the value of is set in advance, and when the operation signal is larger than the failure determination value and the signal from the neutral position detection unit indicates a neutral position, the operation signal is abnormal. A hydraulic drive control device characterized by determining. 6. The hydraulic drive control device according to claim 5, wherein the failure determination means has a second absolute value greater than the first value in the operation signal as the failure determination value.
A hydraulic drive control device characterized by using the following values: