Method for monitoring the reversing process of electrically actuatable units

• US 20050097821A1
• Filed: 08/06/2002
• Published: 05/12/2005
• Est. Priority Date: 10/17/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Knab, Norbert, Kahles, Patric
• Granted Patent: US 7,122,981 B2
• Time in Patent Office: Days
• US Class Current: 49/28
• CPC Class Codes: H02H 1/04 Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
• CPC Class Codes: H02H 3/24 responsive to undervoltage or no-voltage H02H3/207 takes precedence
• CPC Class Codes: H02H 7/0851 for motors actuating a movable member between two end positions, e.g. detecting an end position or obstruction by overload signal

Abstract

The invention relates to a method for monitoring and controlling reversing actions in electrically actuatable units, wherein an actuating drive unit can exert an actuating force in order to move an electrically actuatable unit, and a safety circuit automatically switches off the actuating drive unit after a jamming switch-off time that is predetermined for a movement if no movement occurs despite the triggering of the actuating drive unit. According to the invention, a triggered reversing action results in a temporary extension of the predetermined jamming switch-off time from a short jamming switch-off time t₁ that is predetermined for normal operation to a longer jamming switch-off time t₂ (2).

Claims

1. A method for monitoring and controlling reversing actions in electrically actuatable units, wherein an actuating drive unit can exert an actuating force in order to move an electrically actuatable unit and a safety circuit automatically switches off the actuating drive unit after a jamming switch-off time that is predetermined for a movement has elapsed if no movement occurs despite the triggering of the actuating drive unit, characterized in that a triggered reversing action results in a temporary extension of the predetermined jamming switch-off time from a short jamming switch-off time t₁ that is predetermined in a normal case to a longer jamming switch-off time t₂ (2).

2. The method according to claim 1, characterized in that an extension of the predetermined jamming switch-off time from a short jamming switch-off time t₁ that is predetermined in a normal case to a longer jamming switch-off time t₂ (2) occurs only if an operating voltage required for triggering the reversing action falls below a predetermined threshold value.

3. The method according to claim 1, characterized in that an extension of the predetermined jamming switch-off time from a short jamming switch-off time t₁ that is predetermined in a borderline case to a longer jamming switch-off time t₂ (2) occurs only if an operating voltage for switching the actuating drive unit with the aid of at least one relay lies in a range close to the relay pick-up voltage of the at least one relay.

4. The method according to claim 1, characterized in that an extension of the predetermined jamming switch-off time from a short jamming switch-off time t₁ that is predetermined for normal operation to a longer jamming switch-off time t₂ (2) occurs only if an operating voltage for switching the actuating drive unit with the aid of at least one relay is less than the relay pick-up voltage.

5. The method according to claim 1, characterized in that the reversing action corresponds to a reversal from a closing action into an opening action.

6. The method according to claim 1, characterized in that the predetermined jamming switch-off time is counted down on a jamming counter (11).

7. The method according to claim 1, characterized in that the current position of the electrically actuatable unit is detected (7) by at least one position sensor.

8. The method according to claim 7, characterized in that the current position (3) of the electrically actuatable unit detected by the position sensor is stored as a reversal position when a reversing action (1) is triggered.

9. The method according to claim 8, characterized in that the predetermined jamming switch-off time is set to the short jamming switch-off time t₁ if within the predetermined jamming switch-off time t₁ or t₂, the position sensor detects a movement from the reversal position in the direction sought by the reversing action.

10. The method according to claim 8, characterized in that the predetermined jamming switch-off time is set to the short jamming switch-off time t₁ if the movement in the direction sought by the reversing action that the position sensor detects within the predetermined jamming switch-off time t₁ or t₂ is equal to or greater than a defined desired movement Δ

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