Method of monitoring movement path of part

• US 5,714,853 A
• Filed: 09/20/1996
• Issued: 02/03/1998
• Est. Priority Date: 10/25/1995
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Knab, Norbert, Pruessel, Holger
• Primary Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US08/717,421
• Time in Patent Office: 501 Days
• Field of Search: 318/280-293, 318/440-470, 318/489, 318/603, 49/28, 49/349, 49/26, 49/31
• US Class Current: 318/265
• CPC Class Codes: E05F 15/40 Safety devices, e.g. detection of obstructions or end positions
• CPC Class Codes: E05F 15/41 Detection by monitoring transmitted force or torque E05F15/48 takes precedence; Safety couplings with activation dependent upon torque or force, e.g. slip couplings
• CPC Class Codes: E05Y 2400/57 Disabling thereof
• CPC Class Codes: E05Y 2400/58 Sensitivity setting or adjustment
• CPC Class Codes: E05Y 2800/748 end
• CPC Class Codes: E05Y 2900/50 for vehicles
• CPC Class Codes: E05Y 2900/55 Windows
• CPC Class Codes: G05B 19/4062 Monitoring servoloop, e.g. overload of servomotor, loss of feedback or reference
• CPC Class Codes: G05B 2219/36489 Position and force
• CPC Class Codes: G05B 2219/37626 By measuring changing forces in different position zones
• CPC Class Codes: G05B 2219/42272 Total movement is divided in several zones with different protection parameters
• CPC Class Codes: G05B 2219/42288 Limit, stop drive current if axis obstructed, blocked, force against stop

Abstract

A movement path of a part which is movable by a drive relative to at least one end position is monitored by monitoring the drive, and turning off or reversing the drive is performed in dependence on the exceeding of at least one predetermined parameter. The movement path of the path is subdivided into regions in which different influences are performed. In particular, the movement path is subdivided into five regions in which a different drive force limiting (closing force limiting) of the drive is performed.

Claims

1. A method of monitoring a movement path of a part movable by a drive between two end positions, comprising the steps of monitoring a drive;

performing a switching or reversing of the drive in dependence on exceeding of at least one predetermined parameter;

subdividing a total movement path of the part into regions in which a different influence is performed, said subdividing including subdividing the movement path into five regions in which a different drive force limiting of the drive is performed;

performing no drive force limiting in regions which directly adjoin the end positions; and

performing different drive force limiting in three regions located between two outer regions.

2. A method as defined in claim 1;

and further comprising the step of adjusting boundaries between the regions via the drive after a first movement of the part relative to the end position.

3. A method as defined in claim 1;

and further comprising the step of performing the drive force limiting in dependence on a force which counter acts the movement of the part.

4. A method as defined in claim 1;

and further comprising the step of performing the drive force limiting in dependence on a spring rate associated with a force counter acting the movement of the part.

5. A method as defined in claim 3, and further comprising the step of performing the drive force limiting in dependence on a spring rate associated with a force counter acting the movement of the part.

6. A method as defined in claim 1;

and further comprising the step of performing a drive force limiting in one region with a force of maximum 100N and a spring rate of less than 20 N/mm.

7. A method as defined in claim 1;

and further comprising the step of performing a drive force limiting in another region with a force of maximum 100N and a spring rate of 20-65 N/mm.

8. A method as defined in claim 1;

and further comprising the step of performing a drive force limiting in a further region with a force of greater than 100N independently from a spring rate.