JPH0653551B2 - Elevator position detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in an apparatus for detecting the position of an elevator.

[Conventional technology and problems]

Recently, the electronic control of elevators has been progressing, but the detection of the car position, which is indispensable for elevator control, is no exception.A typical example is the generation of a pulse every time the elevator moves a certain distance. Is a method of detecting the car position by providing a pulse generator and calculating the number of pulses using a microcomputer or the like.

However, according to this method, for example, when a power failure occurs while the car is running, if there is no allowance for it, calculation will not be performed at the same time as the power is lost, and the car position will be lost, so passengers can be rescued. It will be difficult.

In the case of an elevator used for fire fighting activities in the event of a fire, etc., after the power failure occurs, the building's own power source calls the elevator back to the standard floor, and firefighters board it to use it for fire fighting activities. If the location of the car is unknown at this time, it may be necessary to temporarily stop at a floor different from the standard floor, or in some cases drive to the end floor opposite to the standard floor and then call back to the standard floor, which requires time to call back. Fire fighting activities are delayed by that amount.

In addition, if the power supply is cut off not only when a power failure occurs but also during installation or maintenance, there is the inconvenience that it takes time to get into the car unless the car position is known.

In order to prevent various inconveniences due to the car position not being known in this way, conventionally, a device for calculating the position of the elevator is backed up by a backup power source such as a battery. In this case, if the rated speed of the elevator is low, even if a power failure occurs during traveling, the time until it is stopped by the electromagnetic brake is short, about 1 second, that is, the time required to back up the arithmetic unit is short Although the capacity of the power supply can be small, the distance and time until it stops by the electromagnetic brake becomes longer due to the rise in the number of elevators in the building in recent years, and as a result, the backup power supply also needs a large capacity. was there.

[Means for solving problems]

The present invention has been made to solve the above problems,
(EN) A car position detecting device capable of reducing the capacity of a standby power supply regardless of the speed of an elevator and further accurately grasping the car position during a power failure.

The present invention has been made by focusing on the fact that the deceleration is substantially constant when the car is stopped by the electromagnetic brake, and that the backup power supply of the arithmetic unit only needs to be backed up during the arithmetic. However, a means for detecting the loss of the power supply, a device for calculating the deceleration immediately after the deceleration of the car when the power is lost, a device for calculating the car stop position from the deceleration, and a storage position of the car are stored. Storage device, a display device for displaying the stop position of the car, a first standby power source for backing up the storage device and the display device, and a device for calculating the deceleration and the stop position of the car only during calculation. It is configured to include a second backup power source for backup.

〔Example〕

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

FIG. 1 is an overall configuration diagram showing an embodiment of an elevator position detecting device according to the present invention.

In FIG. 1, 1 is an elevator car, 2 is a speed governor rope which is connected to the car 1 at both ends and is formed endlessly, and is arranged along a hoistway. 3 is a speed governor rope installed in a machine room. 2 is a speed governor car wound around, 4 is a tension vehicle installed at the bottom of the hoistway and is wound with a speed governor rope 2, and 5 is a pulse connected to the speed governor car 3 and proportional to the travel distance of the car 1. Is a pulse generator, 6 is a pulse counter, 7 is a microcomputer as an arithmetic unit for calculating the car position and deceleration, 8 is an AVR (automatic voltage regulator) that acts as a constant voltage power source for the microcomputer 7, and 9 is A capacitor as a second backup power source that supplies power to the AVR 8 for a predetermined time when the power source is lost, 10 is a low voltage detector as a means for detecting the loss of the power source, 11 is a rectifier that rectifies the AC power source 12 into a DC voltage, 1 Is a memory that stores the expected stop floor calculated by the microcomputer 7, 14 is an indicator that displays the elevator stop floor, and 15 is a first standby power supply that backs up the memory 13 and the display 14 when the power is lost. As a battery.

FIG. 2 shows the microcomputer 7 when the power is lost.
3 is a flowchart illustrating the operation of the above.

The operation of this embodiment will be described below with reference to FIGS. 1 and 2.

The pulse generator 5 connected to the speed governing vehicle 3 generates a pulse for each predetermined movement amount of the car as the car 1 moves up or down, that is, at a frequency according to the speed of the car, and outputs the pulse to the pulse counter 6. send. The pulse counter 6 counts the number of pulses after the car 1 starts traveling, and inputs it to the microcomputer 7 as the moving distance of the car 1.
The pulse is also directly input from the pulse generator 5 to the microcomputer 7, and the microcomputer 7 calculates the speed of the car from the cycle of the pulse.

The microcomputer 7 performs a calculation for exchanging the moving distance with the floor position of the elevator, and outputs the current car position on the display 14 via the memory 13.

If the power is lost due to a power outage, etc.,
Since the voltage of the AC power supply 12 drops, the low voltage detector detects it and generates an output.

On the other hand, the electromagnetic brake of the elevator is released by a circuit (not shown) due to the disappearance of the power source, and the elevator starts decelerating. At this time, the capacitor 9 is charged with electric charge, and power is supplied to the microcomputer 7 through the AVR 8 for a predetermined time.

When the signal is input from the low voltage detector 10, the microcomputer 7 recognizes the disappearance of the power source and starts the process of the flowchart shown in FIG. 2 (step S21). First, when the power loss is detected, the operation delay time for releasing the electromagnetic brake is waited for about 0.3 seconds, and then the elevator speed V ₁ immediately after the start of deceleration is calculated from the output pulse of the pulse generator (step S22). Next, after a predetermined time T, the elevator speed V ₂ is calculated again (step S23). Then, the deceleration D is calculated by the following equation from the elevator speeds V ₁ and V ₂ and the time T (step S24).

Since the braking torque of the electromagnetic brake is substantially constant, the elevator also decelerates at a substantially constant deceleration D and stops. Therefore, the speed V ₂
The moving distance of the car from the point of time to the stop is deceleration D
Then, the car position at the time of the speed V _{2 and} the predicted car stop distance are calculated (step S25). Furthermore, this estimated stop distance is converted into the estimated stop floor (step S26),
This is output to the memory 13 (step S27). Memory 1
3 and the display 14 are held by using the battery 15 as a power source, the display 14 continues to display the accurate stop position of the car 1 even when the charge of the capacitor 9 is discharged and the microcomputer is powered off.

In the above embodiment, the battery 15 is the memory 1
A small capacity is sufficient because it only supplies power to 3 and the display 14, but a switch is provided between the battery 15 and the display 14 when there is no need to continue displaying the car stop position when the power is lost. The battery 15 can be further reduced in capacity by turning on the switch only when necessary to display the car position.

EFFECTS OF THE INVENTION According to the present invention, the backup of the computing device by the second standby power supply after the power supply disappears may be performed until the car stop position is calculated by deceleration, and the backup is performed until the car actually stops. Compared with the above, the capacity of the second standby power supply can be significantly reduced particularly in the high speed elevator.
Therefore, it is possible to use a capacitor instead of a battery as the second auxiliary power source, and the cost can be reduced.

Moreover, since the actual deceleration of the elevator is detected and the car stop position is calculated, an accurate stop position can be obtained regardless of the load state of the car.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of the microcomputer in the embodiment. 1 ... Basket, 5 ... Pulse generator 6 ... Pulse counter 7 ... Microcomputer 8 ... AVR, 9 ... Capacitor 10 ... Low voltage detector, 11 ... Rectifier 12 ... Power supply, 13 ... Memory 14 ... Display, 15 ... Battery

Claims (2)

[Claims] 1. A position detecting device for an elevator, comprising a pulse generator for generating a pulse according to the traveling of an elevator, counting the pulses to calculate a car position, and displaying the car position even when the power is lost. , A device for detecting the loss of power, a device for calculating deceleration immediately after the start of deceleration of the car when the power is lost, a device for calculating a car stop position from the deceleration, and a storage of the car stop position. Storage device, a display device for displaying the stop position of the car, and a first backup device for the storage device and the display device.
Position detection device for an elevator, comprising: a backup power supply of 1) and a second backup power supply that backs up the device that calculates the deceleration and the stop position of the car only during the calculation. 2. The position detecting device for an elevator according to claim 1, wherein a capacitor is used as the second standby power source.