JPH0912245A - Elevator position detection device - Google Patents

Abstract

PURPOSE: To improve detection precision of a positional data during travelling and to reduce a flooring error by correcting a positional detection error due to expansion and contraction of a speed governor rope in accordance with a driving state of an elevator. CONSTITUTION: Expansion and contraction quantity of a speed governor rope is computed from an absolute position detector 8 set on a passenger cage 1, acceleration of an elevator and cage position in a position detector by a rotary encoder 5 set on a speed governor pulley 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator position detecting device, and more particularly to an elevator position detecting device having a long rope such as in a high-rise building and an elevator equipped with an operation that requires accurate car position detection.

[0002]

2. Description of the Related Art The conventional technique includes the following known techniques. That is, the position data by the rotary encoder of each floor is stored in the memory by the signals of the rotary encoder attached to the motor shaft and the absolute position detector attached to the car. Then, while the elevator is traveling, the position data stored in the memory in advance is set in the car position data by the operation of the edge passage signal of the absolute position detector to correct the position deviation during the elevator traveling, and finally Correct the car landing point.

Further, as described in Japanese Patent Laid-Open No. 4-323108, even in the position detector using the absolute value type rotary encoder, the landing point of the car is read by the edge of the absolute position detector on the floor. It is set by adding a fixed value to the position data.

[0004]

The prior art described above accurately detects the moving distance from the edge of the absolute position detector on the floor, which is the last correction point of the position data, until the car stops landing. Had to do. This is because the elevator is required to prevent tripping when the vehicle normally stops, and to perform a floor alignment operation that corrects a small landing error caused by getting on and off the passenger when the elevator stops. However, since the amount of movement of the car is transmitted to the position detector by a rope, it is affected by the expansion and contraction of the rope during acceleration / deceleration, which causes an error in the position data. There was a problem that when the big car arrived, it became a step to the building side and it was dangerous for passengers.

[0005]

In order to achieve the above object, the present invention detects a car position by a rotary encoder installed in a speed governor, and corrects a car position by at least one absolute position detector. In the elevator position detecting device having the correction means, the second correction means for further correcting the first correction value according to the operating state of the elevator is provided. The second correction value can be changed according to the acceleration / deceleration of the elevator and the car position.

[0006]

Since the present invention is constructed as described above, it is possible to correct the error of the position detector caused by the expansion and contraction of the governor rope during the traveling of the elevator by the acceleration / deceleration of the elevator and the car position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, both ends of a governor rope 2 are locked to the car, and the governor rope 2 is connected to a governor pulley 3 provided at the upper and lower ends of the hoistway. It is stretched between the tension pulley 4. The governor pulley 3 has
The rotary encoder 5 is coupled and inputs its signal to the position correction circuit 7 inside the position detection circuit 6.
The position correction circuit 7 also receives the signal from the absolute position detector 8 attached to the car 1.

FIG. 2 shows a block diagram of the position correction circuit 6. The position data 9 output from the position detection circuit 6 is input to the acceleration detection circuit 10 and the speed governor rope weight calculation circuit 11 from the speed governor pulley 3 to the car 1. These output signals α, m and the spring constant k1 which is stored data
2 is input to the governor rope expansion / contraction amount calculation circuit 13. The calculated correction value x14 and the position data 9 are added by the adder 15 and the absolute position detection signal 16 is turned on to obtain the corrected position data. Here, m and x are calculated by the following equations.

[Method of calculating m]

[0011]

## EQU1 ## m = (HY) × MH: Distance from the lowest floor to the machine room Y: Position detection value M: Unit weight of speed governor rope [Calculation method of m]

[0012]

## EQU00002 ## From m.alpha. = Kx, k: spring constant of governor rope, x = m.alpha..times.k.alpha .: acceleration of car, FIG. 3 shows a position correction flowchart. After confirming that the elevator is traveling in step S1, the position data correction value is calculated in step S2. After confirming that the absolute position detector attached to the car has operated in step S3, the position data is corrected in step S4. Step S
After confirming that the absolute position detector on the landing floor worked in 5,
In step S6, the landing position data is corrected. Step S
In step 7, the stop position of the car is confirmed. In step S8, it is confirmed whether or not the stop position is largely deviated from the landing position.

As described above, according to the present embodiment, the position detection error due to the expansion and contraction of the governor rope can be calculated according to the state during traveling of the elevator, so that extremely accurate position detection can be realized.

[0014]

According to the present invention, the position detection error due to the expansion and contraction of the speed governor rope can be corrected by the acceleration / deceleration of the elevator and the position of the car, so that the detection accuracy of the position data during traveling is improved, and The landing error can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram of a position correction circuit.

FIG. 3 is a position correction flowchart.

[Explanation of symbols]

1 ... Car, 2 ... Governor rope, 3 ... Governor pulley,
4 ... Tension pulley, 5 ... Rotary encoder, 6 ...
Position detection circuit, 7 ... Position correction circuit, 8 ... Absolute position detector.

Claims (3)

[Claims] 1. An elevator position detecting apparatus having a first correcting means for detecting a car position by a rotary encoder installed in a speed governor pool, and correcting a car position by an absolute position detector attached to the car. An elevator position detecting device comprising a second correcting means for further correcting the first correction value according to the operating state of. 2. The elevator position detecting device according to claim 1, further comprising a circuit capable of changing the second correction value by an elevator accelerating / decelerating device. 3. The elevator position detecting device according to claim 1, further comprising a circuit capable of changing the second correction value according to the car position of the elevator.