METHOD FOR OPENING/CLOSING OF A SECURE HANDS-FREE ACCESS BY DETECTION OF MOVEMENT OF A LOWER MEMBER OF A USER

• US 20140070920A1
• Filed: 09/10/2013
• Published: 03/13/2014
• Est. Priority Date: 09/10/2012
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Continental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
• Inventors: CORDIER, Maxime, ELIE, Olivier, GUIBBERT, Mickael
• Granted Patent: US 9,344,083 B2
• Time in Patent Office: Days
• US Class Current: 340/5.72
• CPC Class Codes: B60R 25/2054 by foot gestures
• CPC Class Codes: E05F 15/73 responsive to movement or presence of persons or objects
• CPC Class Codes: E05Y 2400/858 by body parts, e.g. by feet
• CPC Class Codes: G07C 2209/64 using a proximity sensor
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks
• CPC Class Codes: H03K 17/945 Proximity switches H03K17/96 takes precedence

Abstract

A reliable and secure activation of an access based on a detection of movement in a remote access system by providing a secure method for opening/closing of an access in hands-free access mode. The detection of movement relates to the displacement of a lower member of a user by a remote access system, this access system including at least two elements of detection which each emit a signal whose variations (31, 33, 35) are analyzed. The detection of a movement of a lower member is validated by the application of a double verification step according to parameters (dAsA, dAsB) of a criterion for identification (tA, tB; dAsA, dAsB) of a form of variation (F2; A, B) of each signal (31, 33, 35) with a model form of the movement, and according to a criterion for simultaneity of detection of the forms of variation (F2) identified on the two signals.

Claims

1. A method for opening/closing an access (102) in hands-free access mode made secure by detection of movement of a lower member (3, 4) of a user by a remote access system, this access system comprising at least two means of detection (1, 2) which each emit a signal whose variations (10,12;

31, 33, 35) are analyzed, the detection of a movement of a lower member of the human body (3, 4) being validated by the application of a double verification step according to a criterion for identification of a form of variation (F1, F2) of each signal with a model form of said movement (23), and according to a criterion for simultaneity of detection of the forms of variation (25) identified on the signals, said method being characterized in that, the form to be verified being represented by a sharp point (P, M1, A) between two slopes (Pb, Pa) of opposite signs of the V-shaped type, the identification criterion comprises the detection of times (tA, tB) of critical changes in variation of slope inclination of this form, corresponding to the detection of a sharp point (A) and of an exit (B) of a form (F2), in order to acquire the values of the critical variations of slope inclination (dAsA, dAsB) at the sharp point (A) and at the form exit (B), the determination of the values of a ratio R of variation in instantaneous amplitude and of duration EtA of travel of the form (F2), together with comparisons (61, 63, 59) of these values of critical variations in slope inclination (dAsA, dAsB), of the ratio R of variation in amplitude and of duration EtA of the form (F2) with predefined threshold values (Amin, Bmin;

Etmax;

Rmin).

2. The opening/closing method as claimed in claim 1, in which the determination of the ratio (R) of variation in instantaneous amplitude is carried out based on the variation in signal amplitude between a critical point of change in instantaneous inclination (A, B) and a current point, divided by the duration of travel between these points.

3. The opening/closing method as claimed in claim 1, in which the form identification criterion (23) comprises a test for a strictly increasing slope (47, 53) of the forms (F2) verified before validation.

4. The opening/closing method as claimed in claim 1, in which the criterion for simultaneity of the forms is verified when the difference between the times of detection of their sharp points (A) is less than a predefined value.

5. The opening/closing method as claimed in claim 4, in which the predefined value is 250 ms.

6. The opening/closing method as claimed in claim 1, in which an additional verification step consists in applying a coherence criterion by determining the ratio between the larger and the smaller of the variation amplitudes (27) of a pair of forms from different signals, satisfying the criteria for identification (23) and for simultaneity (25), and in validating this additional step when this ratio is substantially equal to or less than a predefined value.

7. The opening/closing method as claimed in claim 6, in which the ratio of the variation amplitudes is equal to or less than 4.

8. The opening/closing method as claimed in claim 6, in which the variation amplitude of the forms satisfying the identification and simultaneity criteria is measured by the difference in amplitude between the sharp point (A) and the form exit (B).

9. The opening/closing method as claimed in claim 1, in which the verifications carried out on the signals are preceded by a step for filtration of the signals (21) designed to eliminate the interference effects due to high frequency variations.

10. The opening/closing method as claimed in claim 2, in which the form identification criterion (23) comprises a test for a strictly increasing slope (47, 53) of the forms (F2) verified before validation.

11. The opening/closing method as claimed in claim 2, in which the criterion for simultaneity of the forms is verified when the difference between the times of detection of their sharp points (A) is less than a predefined value.

12. The opening/closing method as claimed in claim 7, in which the variation amplitude of the forms satisfying the identification and simultaneity criteria is measured by the difference in amplitude between the sharp point (A) and the form exit (B).