Elevator installation and method for determining and analyzing an elevator car position
An elevator installation with at least one car includes at least one device for determining a position of the car and a method of operating such an elevator installation. The position determining device has a code mark pattern and a sensor device. The code mark pattern is arranged along the length of travel of the car and consists of a multiplicity of code marks. The sensor device is mounted on the car and has sensors contactlessly scanning the code marks. The code marks are arranged in a single line and the sensor device comprises at least two sensor groups which are separated from each other perpendicular to the line of the code marks, which makes reading the code marks possible even if there are lateral displacements between the sensor device and the line of the code marks.
1. An elevator installation having at least one car and at least one device for determining a position of the car, the position determining device comprising:
a code mark pattern arranged along a length of a path of travel of the car and being formed from a plurality code marks arranged in a single line;
a sensor device mounted on the car for scanning said code marks contactlessly with a plurality of sensors, said sensors being arranged in at least two groups for scanning said code marks redundantly and generating a signal from each group representing the scanned code mark pattern, and wherein said at least two sensor groups are separated from each other by a predetermined distance perpendicular to the line of said code marks and wherein said sensors of at least one of said at least two sensor groups are arranged in two sensor lines running parallel to the line of said code marks; and
an analyzer connected to said sensor device for analyzing said signals generated by said sensor device to determine a current position of the car.
2. The elevator installation according to claim 1 wherein said predetermined distance by which said sensor groups are separated from each other permits said sensors of at least one of said at least two sensor groups to generate complete information regarding a current position of the car when a transverse deviation of said sensor device from a centered position relative to the line of said code marks does not exceed a value of 30% of a width of said code marks.
3. The elevator installation according to claim 1 wherein said predetermined distance by which said sensor groups are separated from each other permits said sensors of said at least two sensor groups to generate complete information regarding a current position of the oar when a transverse deviation of said sensor device from a centered position relative to the line of said code marks does not exceed a value of 15% of a width of said code marks.
4. The elevator installation according to claim 1 wherein when as a result of a transverse deviation of said sensor device from a centered position relative to the line of said code marks, said at least two sensor groups generate different information, said analyzer responds by combining the different information to determine the current position of the car.
5. The elevator installation according to claim 1 wherein said analyzer compares information received from said at least two sensor groups and at least one of saves and displays deviation information if the information received deviates from each other over a defined period of time or during a defined number of trips of the car.
6. An elevator installation having at least one car and at least one device for determining a position of the car, the position determining device comprising:
a code mark pattern arranged along a length of a path of travel of the car and being formed from a plurality code marks arranged in a single line;
a sensor device mounted on the car for scanning said code marks contactlessly with a plurality of sensors, said sensors being arranged in at least two groups for scanning said code marks redundantly and generating a signal from each group representing the scanned code mark pattern wherein said at least two sensor groups are separated from each other by a predetermined distance perpendicular to the line of said code marks; and
an analyzer connected to said sensor device for analyzing said signals generated by said sensor device to determine a current position of the car and wherein said analyzer compares information received from said at least two sensor groups and at least one of saves and displays deviation information if the information received deviates from each other over a defined period of time or during a defined number of trips of the car.
7. The elevator installation according to claim 6 wherein said predetermined distance by which said sensor groups are separated from each other permits said sensors of at least one of said at least two sensor groups to generate complete information regarding a current position of the car when a transverse deviation of said sensor device from a centered position relative to the line of said code marks does not exceed a value of 30% of a width of said code marks.
8. The elevator installation according to claim 6 wherein said predetermined distance by which said sensor groups are separated from each other permits said sensors of said at least two sensor groups to generate complete information regarding a current position of the car when a transverse deviation of said sensor device from a centered position relative to the line of said code marks does not exceed a value of 15% of a width of said code marks.
9. The elevator installation according to claim 6 wherein said sensors of at least one of said at least two sensor groups are arranged in two sensor lines running parallel to the line of said code marks.
10. The elevator installation according to claim 6 wherein when as a result of a transverse deviation of said sensor device from a centered position relative to the line of said code marks, said at least two sensor groups generate different information, said analyzer responds by combining the different information to determine the current position of the car.