LIMIT-CURVE CONTROL SYSTEM FOR ELEVATORS

Abstract

Method for monitoring the speed of an elevator car, with the car door in particular unlocked, within the unlocking zone of the elevator shaft, having a first speed-limit curve, having a first switchover event, having a second speed-limit curve, and having a second switchover event. The first speed-limit curve has a range of values between a first maximum value at the entry to the unlocking zone and a first minimum value at the envisaged stopping point. The first switchover event corresponds to the car traveling beyond the stopping point or to a stoppage within the unlocking zone. The second speed-limit curve has a range of values between a second maximum value at the envisaged stopping point and one or two second minimum values at the entry to, and exit from, the unlocking zone. The second switchover event corresponds to a departure signal or to the locking of the car door.

Claims

1. A method for monitoring the speed of a car of an elevator, in particular with the car door unlocked, within the unlocking zone of the elevator shaft, having a first speed-limit curve, with a range of values between a first maximum value at the entry to the unlocking zone and a first minimum value at the envisaged stopping point, having a first switchover event, which corresponds to the car traveling beyond the stopping point or to a stoppage within the unlocking zone, having a second speed-limit curve, with a range of values between a second maximum value at the envisaged stopping point and one or two second minimum values at the entry to, and the exit from, the unlocking zone, having a second switchover event, which corresponds to a departure signal, in particular to the locking or the closure of the car door, wherein the speed of the car, with the car door unlocked, is monitored followed entry of the car into the unlocking zone until the occurrence of the first switchover event when the first speed-limit curve is reached or exceeded, and is monitored following occurrence of the first switchover event until the occurrence of the second switchover event when the second speed-limit curve is reached or exceeded, and wherein, in the event of one of the limit curves being reached or exceeded, an alarm reaction is initiated.

2. The method according to claim 1, wherein the first speed-limit curve has a first maximum value, which is smaller than or equal to the highest permissible speed of a car within an unlocking zone envisaged for arrival, in particular smaller than or equal to 0.8 m/s, and/or has a first minimum value, which is smaller than or equal to the highest permissible speed of a car, with the door unlocked, within an unlocking zone, in particular smaller than or equal to 0.3 m/s, and/or declines continuously, in particular declines continuously to a progressive extent, between the first maximum value and the first minimum value.

3. The method according to claim 1, wherein the second speed-limit curve has a second maximum value, which is smaller than or equal to the highest permissible speed of a car, with the car door unlocked, within an unlocking zone, in particular smaller than or equal to 0.3 m/s, and/or has one or two second minimum values, which are smaller than or equal to the highest permissible speed of a car, with the car door unlocked, within an unlocking zone, in particular smaller than or equal to 0.3 m/s, in particular 0 m/s, and/or declines continuously, in particular declines continuously to a progressive extent, between the second maximum value and the one or two second minimum values.

4. The method according to claim 1, wherein the first minimum value of the first speed-limit curve is equal to the second maximum value of the second speed-limit curve.

5. The method according to claim 1, wherein the unlocking zone has an extent which meets legal requirements, and in particular an extent of smaller than or equal to 35 cm, in particular smaller than or equal to 20 cm, above and below the stopping point.

6. The method according to claim 1, having a tolerance range for the stoppage of the car of smaller than or equal to 2 cm, in particular of smaller than or equal to 1 cm, above and below the stopping point.

7. An elevator-control system for an elevator with a car in an elevator shaft, having a first limit curve, having a first switchover event, having a second limit curve, having a second switchover event and wherein the elevator-control system is designed to implement a method according to claim 1.

8. An elevator with a car in an elevator shaft, having an elevator-control system according to claim 7.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0023] Exemplary embodiments of the present invention are illustrated in the drawings and will be explained in more detail hereinbelow. Like reference signs in the individual figures here denote corresponding elements.

[0024] FIG. 1 shows a diagram of the limit curves.

DETAILED DESCRIPTION OF THE INVENTION

[0025] FIG. 1 shows a diagram of the limit curves.

[0026] The axis 11 shows the possible height position of the car of an elevator around a stopping point 23. The stopping point is surrounded by an unlocking zone, with an upper boundary of the unlocking zone 21 and a lower boundary of the unlocking zone. Within the unlocking zone, it is possible, in accordance with certain requirements, for the car to travel, under certain conditions, with the car door unlocked.

[0027] The axis 12 shows the speed of a car of an elevator in the region of an unlocking zone and has various speed barriers 31, 32, 33 and 34. The maximum permissible arrival speed 34 for the arrival of the car in the unlocking zone corresponds to the first maximum value 34 of the first speed-limit curve 41. The minimum permissible adjustment speed 33 corresponds to the first minimum value 33 of the first speed-limit curve 41 and to the second maximum value 33 of the second speed-limit curve 42. The minimum adjustment speed 32 corresponds to the minimum value or values 32 of the second speed-limit curve 42. The zero point of the speed 31 corresponds to the car being at a standstill.

[0028] The first speed-limit curve 41 begins at the upper boundary of the unlocking zone 21 with the maximum permissible adjustment speed 34 and reduces the speed continuously and in a progressively declining manner to the maximum permissible adjustment speed 34 at the position of the stopping point. The first speed-limit curve 41 is a limit curve of speed as a function of position.

[0029] The second speed-limit curve 42 begins at the upper boundary of the unlocking zone 21 with the minimum adjustment speed 32 and rises continuously, with an ever-decreasing upward slope to the maximum adjustment speed 33 at the position of the stopping point 23, in order to decline from there continuously, to an ever-decreasing extent, to the minimum adjustment speed 32 at the lower boundary of the unlocking zone 22. The speed-limit curve 42 always remains above the speed 0. The first speed-limit curve 42 is a limit curve of speed as a function of position.

[0030] At the position of the stopping point, the speed curve 41 is in contact with the speed curve 42 at the maximum permissible adjustment speed 33.

[0031] The speed profile 13 of the car shows the car entering into the unlocking zone (21, 22) at the upper boundary of the unlocking zone 21 at a speed below the maximum permissible limit speed 42. Following entry into the unlocking zone (21, 22), the car door is unlocked and begins to open. The speed profile 13 of the car continues to run below the speed of the first limit curve 41 until it comes to a standstill in the region of the stopping point 23. Following the standstill, it is possible to adjust the position of the car at a speed below the second speed-limit curve 42. Following the closure and locking of the door(s) for departure, the speed profile 13 runs independently of the maximum permissible adjustment speed 33 and of the maximum permissible arrival speed 34.

[0032] Within an unlocking zone (21, 22), with the car door unlocked, the maximum arrival speed 34 is equal to 0.8 m/s (5.12.1.4.c) and the maximum adjustment speed is equal to 0.3 m/s (5.12.1.4.d), a stoppage (5.6.7.1) having to be initiated on some occasions and with specific conditions (5.6.7.5). An unlocking zone has a maximum extent of 20 cm below and above the stopping point, when the doors of the car and shaft are not driven jointly, and of 35 cm, when the doors of the car and shaft are driven jointly. This means that the upper and the lower boundaries of the unlocking zone are each at a distance of 20 cm or 35 cm from the stopping point.

[0033] The method according to the present invention makes it possible to adhere better to these conditions for the purpose of eliminating stopping in the event of an alarm reaction.

LIST OF REFERENCE SIGNS

[0034] 11 Height position of the floor level of the car [0035] 12 Speed of the car [0036] 13 Speed profile of the car [0037] 21 Upper boundary of the unlocking zone [0038] 22 Lower boundary of the unlocking zone [0039] 23 Stopping point (floor level of the story) [0040] 31 Zero point of the speed [0041] 32 Minimum adjustment speed [0042] 33 Maximum permissible adjustment speed [0043] 34 Maximum permissible arrival speed [0044] 41 First limit speed-limit curve [0045] 42 Second limit speed-limit curve