US 12,275,619 B2
Position-determining system and method for ascertaining a car position of an elevator car
Eric Birrer, Buchrain (CH); and Frank Olivier Roussel, Lucerne (CH)
Assigned to INVENTIO AG, Hergiswil (CH)
Appl. No. 15/733,729
Filed by Inventio AG, Hergiswil (CH)
PCT Filed Apr. 11, 2019, PCT No. PCT/EP2019/059175
§ 371(c)(1), (2) Date Oct. 7, 2020,
PCT Pub. No. WO2019/206644, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 18169048 (EP), filed on Apr. 24, 2018.
Prior Publication US 2021/0032077 A1, Feb. 4, 2021
Int. Cl. B66B 3/02 (2006.01); B66B 1/34 (2006.01); H03M 5/12 (2006.01)
CPC B66B 3/02 (2013.01) [B66B 1/3492 (2013.01); H03M 5/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A position-determining system for ascertaining a car position of an elevator car movable in an elevator shaft, the system comprising:
a code tape mounted next to the elevator car in parallel with a movement direction of the elevator car, the code tape including a code-mark pattern formed of a plurality of individual code marks each being a predetermined code-mark length in the movement direction;
a detection apparatus mounted on the elevator car for detecting the code marks of the code-mark pattern on the code tape;
an evaluation unit determining the car position of the elevator car in the elevator shaft based on the code marks detected by the detection apparatus;
wherein n successive ones of the code marks of the code-mark pattern form a position mark being a predetermined position-mark length in the movement direction, the code-mark pattern including a plurality of the position marks being unambiguously arranged in an n-digit pseudorandom sequence of various ones of the position marks, the position marks forming the code-mark pattern as a single-track code-mark pattern, and a discrete car position being assigned to each of the position marks; and
wherein the detection apparatus has a detection region with a predetermined detection length in the movement direction that is shorter than the position-mark length of the position marks, the detection length being at least one code-mark length less than the position-mark length, and the detection length of the detection region in the movement direction being longer than the code-mark length.