JPH08143237A - Hydraulic elevator controller - Google Patents

Abstract

(57) [Summary] [Object] The present invention allows an elevator to operate safely without giving a starting shock to passengers when the hydraulic elevator starts even if the hydraulic pressure detector fails. According to the present invention, there is provided a hydraulic jack side hydraulic pressure sensor for detecting the hydraulic pressure on the hydraulic jack side of a check valve, a hydraulic pump side hydraulic pressure sensor for detecting the hydraulic pressure on the hydraulic pump side of a check valve, and a hydraulic jack side. The hydraulic jack side failure detection means for detecting the failure of the hydraulic pressure detector, the hydraulic pump side failure detection means for detecting the failure of the hydraulic pump side hydraulic pressure detector, and the hydraulic pump side failure detection means based on the output signal from each hydraulic pressure detector. A speed control function that controls the speed of the electric motor so that the pressure approaches the pressure on the hydraulic jack side, and a valve control that opens the check valve when the pressure on the hydraulic pump side and the pressure on the hydraulic jack side are almost equal. And a control means having a failure determination / control function for determining a failure state based on each failure signal from each failure detection means and controlling the electric motor according to the failure status.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator control device, and in particular, even if the hydraulic pressure detector fails, the elevator can be operated safely without giving a starting shock to passengers when the hydraulic elevator is started. The present invention relates to the hydraulic elevator control device.

[0002]

2. Description of the Related Art FIG. 7 is a schematic diagram showing a configuration example of a conventional hydraulic elevator control device of this type. In FIG. 7, the hydraulic elevator is driven by a hydraulic jack 3 that raises and lowers a car 2 via a plunger 1 and a three-phase induction motor 4, and when the car 2 is raised and lowered, a hydraulic tank 5 applies a pressure to the hydraulic jack 3. Hydraulic pump 6 for supplying / discharging oil
And a check valve 7 installed between the hydraulic jack 3 and the hydraulic pump 6.

On the other hand, the control device includes a hydraulic jack side hydraulic pressure detector 8 for detecting the hydraulic pressure of the check valve 7 on the hydraulic jack 3 side.
And the output signals from the hydraulic pump-side hydraulic pressure detector 9 for detecting the hydraulic pressure of the check valve 7 on the hydraulic pump 6 side, and the output signals from the hydraulic jack-side hydraulic pressure detector 8 and the hydraulic pump-side hydraulic pressure detector 9, When the elevator is started, the speed control function for controlling the speed of the three-phase induction motor 4 so as to bring the pressure on the hydraulic pump 6 side closer to the pressure on the hydraulic jack 3 side based on this input signal, and the pressure on the hydraulic pump 6 side The controller 10 has a valve control function of controlling the opening of the check valve 7 when the pressure on the side of the hydraulic jack 3 becomes substantially equal.

In the hydraulic elevator control apparatus as described above, when the hydraulic elevator is stopped, the pressure between the check valve 7 and the hydraulic jack 3 and the check valve 7 and the hydraulic pump 6 are controlled. The pressure between them is very different.
Therefore, it is necessary to perform control so as to eliminate the pressure difference between these when the hydraulic elevator is started to rise.

That is, when the hydraulic elevator is called and a start command is given, the value of the output signal from the hydraulic jack side hydraulic pressure detector 8 for detecting the hydraulic pressure on the hydraulic jack 3 side and the hydraulic pump 6 side. The value of the output signal from the hydraulic pump side hydraulic pressure detector 9 for detecting the hydraulic pressure is input to the controller 10 so that the three-phase induction motor 4 is controlled so that the pressure on the hydraulic pump 6 side approaches the pressure on the hydraulic jack 3 side. Speed control,
By driving the hydraulic pump 6, it is controlled so as not to give a starting shock to the passenger at the time of starting the hydraulic elevator.

However, in such a hydraulic elevator control device, if the hydraulic jack-side hydraulic pressure detector 8 and the hydraulic pump-side hydraulic pressure detector 9 fail, the output signal values from them will be made substantially equal. Since it becomes difficult to control, there is a risk that a large starting shock will be given to the passengers due to the imbalance of the pressure values at the time of ascending start of the hydraulic elevator.

[0007]

As described above, the conventional hydraulic elevator control device has a problem that a large starting shock may be given to passengers if the hydraulic pressure detector fails. .

An object of the present invention is to provide a hydraulic elevator control device capable of safely operating an elevator without giving a starting shock to passengers at the time of starting the hydraulic elevator even if the hydraulic pressure detector fails. To do.

[0009]

In order to achieve the above object, according to the present invention, a hydraulic jack for moving a car up and down via a plunger and a hydraulic tank driven by an electric motor for moving a car up and down a hydraulic tank are used. In a device for controlling a hydraulic elevator, which comprises a hydraulic pump for supplying / discharging pressure oil to / from a jack and a check valve installed between the hydraulic jack and the hydraulic pump, a check valve on the hydraulic jack side of the check valve is provided. Output signals from the hydraulic jack side oil pressure detector that detects oil pressure and outputs a signal, the hydraulic pump side oil pressure detector that detects the oil pressure on the hydraulic pump side of the check valve and outputs a signal, and the output signal from the oil pressure jack side oil pressure detector From the hydraulic jack side hydraulic pressure detector and the hydraulic jack side fault detecting means for detecting a fault of the hydraulic jack side hydraulic pressure detector based on the input signal and outputting a fault signal. A hydraulic pump-side failure detection unit that inputs a force signal and a signal corresponding to the rotation speed of the electric motor, detects a failure of the hydraulic pump-side hydraulic pressure detector based on the input signal, and outputs a failure signal, and a hydraulic jack-side hydraulic pressure. Input each output signal from the detector and the hydraulic pressure detector on the hydraulic pump side, and control the speed of the electric motor so that the pressure on the hydraulic pump side approaches the pressure on the hydraulic jack side based on the input signal when starting the hydraulic elevator. From the speed control function to perform, the valve control function to open the check valve when the pressure on the hydraulic pump side becomes almost equal to the pressure on the hydraulic jack side, and the hydraulic jack side failure detection means and hydraulic pump side failure detection means. Each failure signal is input, the failure status is determined based on the input signal, and the electric motor is controlled according to the determined failure status. Comprising a control means having a control function.

Here, in particular, as a failure judgment / control function of the above-mentioned control means, when the value of the output signal from the hydraulic pressure detector on the hydraulic pump does not rise corresponding to the rotation speed of the electric motor at the time of starting the hydraulic elevator. , It is determined that the hydraulic pressure detector on the hydraulic pump has failed.

Further, as a failure judgment / control function of the control means, when the value of the output signal from the hydraulic pressure sensor on the hydraulic jack side is other than zero or a value within a predetermined range, the hydraulic pressure sensor on the hydraulic jack side fails. I will judge it as what I did.

On the other hand, the function of judging / controlling the failure of the above-mentioned control means is to perform a predetermined control by the value of the output signal from the hydraulic pressure detector on the hydraulic jack side when it is judged that the hydraulic pressure detector on the hydraulic pump side has failed. The control is performed so that the amount is changed to an open control method that gives a speed command value for the electric motor.

Further, as a failure judgment / control function of the control means, the electric motor is stopped when it is judged that the hydraulic jack side hydraulic pressure detector, or the hydraulic jack side hydraulic pressure detector and the hydraulic pump side hydraulic pressure detector have failed. Then, control is performed so as to stop the operation.

It is desirable that the value in the predetermined range is a value in the pressure range from when the hydraulic elevator is unloaded to when it is rated. Further, it is desirable that the predetermined control amount corresponds to the value of the output signal from the hydraulic jack side hydraulic pressure detector at the time of starting the hydraulic elevator.

[0015]

Therefore, in the hydraulic elevator control device of the present invention, when the hydraulic jack side hydraulic pressure detector / the hydraulic pump side hydraulic pressure detector fails at the time of starting the hydraulic elevator,
By determining the failure state based on each failure signal from the hydraulic jack side failure detection means / hydraulic pump side failure detection means for detecting the failure, and controlling the electric motor according to the determined failure state, Even if the hydraulic pressure detector on the hydraulic jack side / the hydraulic pressure side on the hydraulic pump fails, the elevator can be safely operated without giving a passenger a starting shock due to imbalance of pressures before and after the check valve.

Further, when only the hydraulic pressure detector on the hydraulic pump side fails, the control method is changed to give a control amount predetermined as a value of the output signal from the hydraulic pressure detector on the hydraulic jack side as a speed command value for the electric motor. By performing the control as described above, it is possible to continue the operation of the hydraulic elevator and use the hydraulic elevator even when a failure of the hydraulic pump side hydraulic pressure detector occurs.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the overall configuration of a hydraulic elevator control device according to the present invention.
The same parts as those of are denoted by the same reference numerals, and the description thereof will be omitted. Here, only different parts will be described.

That is, as shown in FIG. 1, the control device for the hydraulic elevator according to the present embodiment has, in addition to FIG. 7, a hydraulic jack side failure detector 11 and a hydraulic pump side failure detector 12.
And a controller 13 having various new functions
It has a configuration with.

Here, the hydraulic jack side failure detector 11
Is to input an output signal from the hydraulic pressure detector 8 on the hydraulic jack side, detect a failure of the hydraulic pressure detector 8 on the hydraulic jack side based on the input signal, and output a failure signal.

In this case, the hydraulic jack side failure detector 11
For example, as shown in FIG. 2, it is determined whether the value of the output signal from the hydraulic pressure sensor 11 on the hydraulic jack side is zero or a value within a predetermined range.
It is determined that the hydraulic pressure detector 8 on the hydraulic jack side has failed.

Further, the hydraulic pump side failure detector 12 inputs the output signal from the hydraulic pump side hydraulic pressure detector 9 and a signal (for example, a rotation speed signal) corresponding to the rotation speed of the three-phase induction motor 4. The failure of the hydraulic pump side oil pressure detector 9 is detected based on this input signal, and the failure signal is output.

In this case, the hydraulic pump side failure detector 12
For example, as shown in FIG. 3, it is determined whether or not the value of the output signal from the hydraulic pump side hydraulic pressure detector 9 is increasing corresponding to the rotation speed of the three-phase induction motor 4 at the time of starting the hydraulic elevator, and the three-phase induction motor is determined. If it does not rise corresponding to the rotation speed of No. 4, it is determined that the hydraulic pump side hydraulic pressure detector 9 has failed.

Further, the controller 13 inputs respective output signals from the hydraulic jack side hydraulic pressure detector 8 and the hydraulic pump side hydraulic pressure detector 9, and at the time of starting the hydraulic elevator, the pressure on the hydraulic pump 6 side is inputted based on these input signals. Speed control function to control the speed of the three-phase induction motor 4 so as to bring the pressure closer to the pressure on the hydraulic jack 3 side, and a check is performed when the pressure on the hydraulic pump 6 side and the pressure on the hydraulic jack 3 side become substantially equal. Valve 7
The valve control function for controlling the open state and each failure signal from the hydraulic jack side failure detector 11 and the hydraulic pump side failure detector 12 are input, and the failure state is determined based on this input signal, and this determination is made. And a failure determination / control function for controlling the three-phase induction motor 4 according to the failure state.

Next, referring to FIGS. 4 to 6, the operation of the control device for the hydraulic elevator according to the present embodiment constructed as described above will be described.
Will be explained. In FIG. 1, the car 2 is driven via a rope, and the plunger 1 is driven by supplying and discharging the operating shaft in the hydraulic jack 3, so that the car 2
Is designed to be raised and lowered.

First, when the hydraulic elevator is stopped, the pressure between the check valve 7 and the hydraulic jack 3 and the pressure between the check valve 7 and the hydraulic pump 6 are greatly different.
Therefore, when the hydraulic elevator is started to rise, control is performed so as to eliminate the pressure difference between them.

That is, the hydraulic pressure detector 8 on the hydraulic jack side,
When the hydraulic pump side oil pressure detector 9 is sound, the hydraulic elevator is called as described above,
When a start command is given, the value of the output signal from the hydraulic jack side hydraulic pressure detector 8 for detecting the hydraulic pressure on the hydraulic jack 3 side and the output from the hydraulic pump side hydraulic pressure detector 9 for detecting the hydraulic pressure on the hydraulic pump 6 side. The value of the signal is input to the controller 13,
By controlling the speed of the three-phase induction motor 4 so as to bring the pressure on the hydraulic pump 6 side closer to the pressure on the hydraulic jack 3 side and driving the hydraulic pump 6, a starting shock is given to the passengers when the hydraulic elevator is started. The control is performed so that it does not exist.

Next, when the hydraulic jack side hydraulic pressure detector 8 and the hydraulic pump side hydraulic pressure detector 9 fail, the control method is changed as follows. FIG. 4 is a flow chart showing the contents of processing executed in the controller 13 when a failure of the hydraulic pressure detector occurs.

(A) That is, the signal notifying the failure of the hydraulic pressure detector 9 on the hydraulic pump side is the failure detector 1 on the hydraulic pump side.
2 is output, the control method brings the pressure value on the hydraulic pump 6 side closer to the pressure value on the hydraulic jack 3 side (pressure balance control), and is determined in advance by the hydraulic pressure detection value on the hydraulic jack 3 side. The control amount is changed to open control that gives a speed command value for the three-phase induction motor 4, and the operation of the hydraulic elevator is continued.

(B) Next, the hydraulic pressure detector 8 on the hydraulic jack side
Signal that informs the failure of the hydraulic jack side failure detector 1
When it is output from 1, if the hydraulic elevator is started as it is, it may cause a large start shock as described above, and thus the operation of the hydraulic elevator is stopped.

(C) Next, a signal notifying the failure of the hydraulic jack 3 side hydraulic pressure detector 8 and the hydraulic pump side hydraulic pressure detector 9 is sent to the hydraulic jack side fault detector 11 and the hydraulic pump side fault detector 12. If both are output at the same time, the hydraulic elevator is left on the floor, the door is opened, and the operation is stopped, as in the case where only the hydraulic jack side hydraulic detector 8 fails. .

Next, a method of determining a failure executed in the controller 13 will be described. FIG. 5 is a flow chart showing a case where the hydraulic pump side hydraulic pressure detector 9 is processed and the hydraulic pump side hydraulic pressure detector 9 has failed.

That is, the hydraulic pressure detector 8 on the hydraulic jack side,
When the hydraulic pump side oil pressure detector 9 is healthy, in the pressure balance control, the pressure on the hydraulic pump 6 side rises as the hydraulic pump 6 rotates, and approaches the pressure on the hydraulic jack 3 side.

If the hydraulic pressure detector 9 on the hydraulic pump side has not failed, the value of the output signal from the hydraulic pressure detector 9 on the hydraulic pump side also rises corresponding to the rotation speed of the three-phase induction motor 4. I will do it.

If the hydraulic pump side hydraulic pressure detector 9 is out of order, the value of the output signal from the hydraulic pump side hydraulic pressure detector 9 becomes zero or the boosting is delayed. Then, in this case, it is determined that there is a failure, and the control method sets the speed control value of the three-phase induction motor 4 to a predetermined control amount based on the value of the output signal from the hydraulic jack side hydraulic pressure detector 8 as described above. The open control method given as is changed and the operation of the hydraulic elevator is continued.

Next, a case where only the hydraulic pressure detector 8 on the hydraulic jack side fails will be described. FIG. 6 is a flow chart showing a case where the hydraulic jack side hydraulic pressure detector 8 is processed and the hydraulic jack side hydraulic pressure detector 8 has failed.

That is, pressure is constantly applied to the hydraulic jack 3 side. Nevertheless, the value of the output signal from the oil pressure detector 8 on the hydraulic jack side becomes zero or a value outside the predetermined range (the pressure range from when the hydraulic elevator is not loaded to when it is rated loaded). Then, in this case, it is determined that there is a failure, and the hydraulic elevator is controlled to stop immediately and stop the operation.

Next, when both the hydraulic pressure detector 8 on the hydraulic jack side and the hydraulic pressure detector 9 on the hydraulic pump side have failed, as in the case where only the hydraulic pressure detector 8 on the hydraulic jack side has failed, the hydraulic elevator. Is controlled to stop immediately and stop the operation.

As described above, in this embodiment, the hydraulic jack 3 for raising and lowering the car 2 via the plunger 1.
Between the hydraulic jack 3 and the hydraulic pump 6, which is driven by the three-phase induction motor 4 and supplies / discharges pressure oil from the hydraulic tank 5 to the hydraulic jack 3 when moving up and down the car 2. In a control device for a hydraulic elevator, which includes a check valve 7 installed, a hydraulic jack side oil pressure detector 8 that detects the oil pressure on the hydraulic jack 3 side of the check valve 7 and outputs a signal, and the hydraulic pressure of the check valve 7. A hydraulic pump-side hydraulic pressure detector 9 that detects the hydraulic pressure on the pump 6 side and outputs a signal, and an output signal from the hydraulic jack-side hydraulic pressure detector 8 are input, and based on this input signal, the hydraulic jack-side hydraulic pressure detector 8 A failure is detected (determination is made as to whether the value of the output signal from the hydraulic jack side hydraulic pressure detector 11 is zero or a value within a predetermined range, and if it is outside the range of zero or the predetermined range, the hydraulic jack side hydraulic pressure detector 8
Is determined to have failed), an output signal from the hydraulic jack side failure detector 11 that outputs a failure signal, an output signal from the hydraulic pump side oil pressure detector 9, and a signal corresponding to the rotation speed of the three-phase induction motor 4 (rotation). (A number signal) is input, and a failure of the hydraulic pressure detector 9 on the hydraulic pump side is detected based on this input signal (the value of the output signal from the hydraulic pressure detector 9 on the hydraulic pump side at the time of starting the hydraulic elevator indicates that the three-phase induction motor 4 has It is determined whether the hydraulic pump is increasing according to the rotation speed, and if the rotation speed of the three-phase induction motor 4 is not increasing, it is determined that the hydraulic pump side hydraulic pressure detector 9 has failed), and a failure signal is output. The output signals from the hydraulic pump-side failure detector 12 for outputting, the hydraulic jack-side hydraulic pressure detector 8 and the hydraulic pump-side hydraulic pressure detector 9 are input, and the hydraulic pump 6 side is based on these input signals when the hydraulic elevator is started. A speed control function that controls the speed of the three-phase induction motor 4 so that the pressure approaches the pressure on the hydraulic jack 3 side, and a check is performed when the pressure on the hydraulic pump 6 side and the pressure on the hydraulic jack 3 side become substantially equal. The valve control function for controlling the opening of the valve 7, the failure signals from the hydraulic jack side failure detector 11 and the hydraulic pump side failure detector 12 are input, and the failure state is determined based on this input signal, and this determination is made. The controller 13 having a failure determination / control function for controlling the three-phase induction motor 4 according to the determined failure state.

Therefore, even if the hydraulic pressure detectors 8 and 9 fail and the pressures on the hydraulic jack 3 side and the hydraulic pump 6 side cannot be made equal at the time of starting the hydraulic elevator, the operating method is changed according to the situation. Therefore, it is possible to obtain a safe and comfortable hydraulic elevator without giving a starting shock to passengers.

Further, since the control method can be changed according to the failure state of the hydraulic pressure detectors 8 and 9, as far as the failure of only the hydraulic pump 6 side is concerned, the operation of the hydraulic elevator should be continued as it is. This makes it possible to prevent users of the hydraulic elevator from being annoyed.

[0041]

As described above, according to the present invention, a hydraulic jack for raising and lowering a car through a plunger and a hydraulic jack driven by an electric motor to supply pressure oil from a hydraulic tank to the hydraulic jack. In a device for controlling a hydraulic elevator consisting of a hydraulic pump for supplying / discharging, and a check valve installed between the hydraulic jack and the hydraulic pump, the hydraulic pressure on the hydraulic jack side of the check valve is detected and signaled. Input the output signal from the hydraulic jack side oil pressure detector, the hydraulic pump side oil pressure detector that detects the oil pressure on the hydraulic pump side of the check valve and outputs a signal, and Failure detection means on the hydraulic jack side that detects a failure of the hydraulic pressure detector on the hydraulic jack side based on the input signal and outputs a failure signal; an output signal from the hydraulic pressure detector on the hydraulic pump side; Hydraulic pump side failure detection means that inputs a signal corresponding to the rotation speed of the machine, detects a failure of the hydraulic pump side oil pressure detector based on the input signal, and outputs a failure signal, and a hydraulic jack side oil pressure detector and oil pressure A speed control function that inputs each output signal from the pump side oil pressure detector and controls the speed of the electric motor so that the pressure on the hydraulic pump side approaches the pressure on the hydraulic jack side based on the input signal when starting the hydraulic elevator. And a valve control function for controlling the opening of the check valve when the pressure on the hydraulic pump side and the pressure on the hydraulic jack side become substantially equal, and each failure signal from the failure detecting means on the hydraulic jack side and the failure detecting means on the hydraulic pump side. And a failure determination / control function for determining a failure state based on the input signal and controlling the electric motor according to the determined failure state. Therefore, even if the hydraulic pressure detector fails, a control device for the hydraulic elevator that can safely operate the elevator without giving a starting shock to passengers when the hydraulic elevator starts is provided. Can be provided.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a control device for a hydraulic elevator according to the present invention.

FIG. 2 is a diagram for explaining an operation of the control device for the hydraulic elevator according to the embodiment.

FIG. 3 is a diagram for explaining an operation of the control device for the hydraulic elevator according to the embodiment.

FIG. 4 is a flowchart for explaining the operation of the control device for the hydraulic elevator according to the embodiment.

FIG. 5 is a flowchart for explaining the operation of the control device for the hydraulic elevator according to the embodiment.

FIG. 6 is a flowchart for explaining the operation of the control device for the hydraulic elevator according to the embodiment.

FIG. 7 is a schematic diagram showing a configuration example of a conventional hydraulic elevator control device.

[Explanation of symbols]

1 ... Plunger, 2 ... Car, 3 ... Hydraulic jack, 4
... three-phase induction motor, 5 ... hydraulic tank, 6 ... hydraulic pump,
7 ... Check valve, 8 ... Hydraulic jack side hydraulic detector, 9 ... Hydraulic pump side hydraulic detector, 10 ... Controller, 11 ... Hydraulic jack side failure detector, 12 ... Hydraulic pump side failure detector, 13
… Controller.

Claims (7)

[Claims] 1. A hydraulic jack for raising and lowering a car through a plunger; a hydraulic pump driven by an electric motor for supplying / discharging pressure oil from a hydraulic tank to the hydraulic jack when the car is raised and lowered; In a device for controlling a hydraulic elevator composed of a check valve installed between a hydraulic jack and a hydraulic pump, a hydraulic pressure on the hydraulic jack side that detects the hydraulic pressure on the hydraulic jack side of the check valve and outputs a signal. A detector, a hydraulic pump-side hydraulic pressure detector that detects the hydraulic pressure on the hydraulic pump side of the check valve and outputs a signal, and an output signal from the hydraulic jack-side hydraulic pressure detector is input and based on the input signal. Hydraulic jack side failure detecting means for detecting a failure of the hydraulic jack side oil pressure detector and outputting a failure signal; an output signal from the hydraulic pump side oil pressure detector; A hydraulic pump side failure detecting means for inputting a signal corresponding to the rotation speed of the machine, detecting a failure of the hydraulic pump side hydraulic pressure sensor based on the input signal, and outputting a failure signal; and the hydraulic jack side hydraulic pressure detector, Each output signal from the hydraulic pressure detector on the hydraulic pump side is input, and the speed of the electric motor is controlled so that the pressure on the hydraulic pump side approaches the pressure on the hydraulic jack side based on the input signal when the hydraulic elevator is started. A speed control function, a valve control function for controlling the opening of the check valve when the pressure on the hydraulic pump side and the pressure on the hydraulic jack side become substantially equal, the hydraulic jack side failure detection means and the hydraulic pump side failure detection function. Each failure signal from the means is input, the failure state is determined based on the input signal, and the electric motor is controlled according to the determined failure state. Control device for a hydraulic elevator, characterized in that it comprises an a control means having a disability determination and control functions. 2. The failure determination / control function of the control means includes a hydraulic pressure when the value of an output signal from the hydraulic pressure detector on the hydraulic pump does not increase in response to the rotation speed of the electric motor at the time of starting the hydraulic elevator. The control device for the hydraulic elevator according to claim 1, wherein it is determined that the pump side oil pressure detector has failed. 3. The failure determination / control function of the control means is such that when the value of the output signal from the hydraulic pressure detector on the hydraulic jack side is zero or other than a value within a predetermined range, the hydraulic pressure detector on the hydraulic jack side fails. The control device for the hydraulic elevator according to claim 1, wherein it is determined that the hydraulic elevator is operated. 4. The function of judging / controlling the failure of the control means is a control predetermined by a value of an output signal from the hydraulic pressure detector on the hydraulic jack side when it is judged that the hydraulic pressure detector on the hydraulic pump has failed. The control device for the hydraulic elevator according to claim 1 or 2, wherein control is performed so as to change to an open control method that gives a quantity as a speed command value of the electric motor. 5. The electric motor is stopped when it is determined that the hydraulic jack side hydraulic pressure detector, or the hydraulic jack side hydraulic pressure detector and the hydraulic pump side hydraulic pressure detector have failed, as a failure determination / control function of the control means. The control device for the hydraulic elevator according to any one of claims 1 to 3, wherein control is performed so as to stop the operation. 6. The hydraulic elevator control device according to claim 3, wherein the value in the predetermined range is a value in a pressure range from when the hydraulic elevator is unloaded to when it is rated loaded. 7. The hydraulic pressure according to claim 4, wherein the predetermined control amount corresponds to a value of an output signal from the hydraulic pressure detector on the hydraulic jack side at the time of starting the hydraulic elevator. Elevator control device.