State memorizing device for movable member

• US 8,035,328 B2
• Filed: 03/26/2009
• Issued: 10/11/2011
• Est. Priority Date: 05/29/2008
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Hozumi, Soichiro, Noda, Kohei, Kanie, Hideyuki
• Primary Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US12/411,787
• Publication Number:
  US 20090295322A1
• Time in Patent Office: 929 Days
• Field of Search: 318/266, 318/466, 318/430, 318/432, 318/434, 318/54, 318/566, 318/565, 701/2, 701/49, 307/10.1
• US Class Current: 318/566
• CPC Class Codes: B60N 2/0248 with memory of positions
• CPC Class Codes: B60N 2220/10 using a database
• CPC Class Codes: G05B 19/19 characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
• CPC Class Codes: G05B 2219/37622 Detect collision, blocking, stall by change, lag in position
• CPC Class Codes: G05B 2219/45022 Auto seat, dentist chair, roll wheel chair
• CPC Class Codes: H02P 29/032 Preventing damage to the motor, e.g. setting individual current limits for different drive conditions

Abstract

A state memorizing device for a movable member, includes a lock state determining portion for determining whether or not the movable member, driven by a motor, is in a locked state, based on a motor current, an initial positional information memorizing portion for memorizing an initial positional information indicative of a current position of the movable member before the motor is started, a current positional information calculating portion for calculating a current positional information indicative of the current position of the movable member on the basis of the position indicated by the initial positional information and the motor current, and a current positional information correcting portion for determining the current position of the movable member based on the initial positional information in a case where the locked state of the movable member is detected and an electrification of the motor is stopped after the motor has just been started.

Claims

1. A state memorizing device for a movable member, comprising:

a lock state determining portion for determining whether or not the movable member, which is driven by a motor, is in a locked state, on the basis of a motor current supplied to the motor;

an initial positional information memorizing portion for memorizing an initial positional information indicative of a current position of the movable member before the motor is started;

a current positional information calculating portion for calculating a current positional information indicative of the current position of the movable member on the basis of the position indicated by the initial positional information and the motor current, the current position of the movable member changes in response to an actuation of the motor; and

a current positional information correcting portion for determining the current position of the movable member on the basis of the initial positional information in a case where the lock state determining portion determines that the movable member is in the locked state and an electrification of the motor is stopped after the motor has just been started, irrespective of the current positional information calculated by the current positional information calculating portion after the motor is started.

2. The sate memory control device according to claim 1, wherein the motor is continuously driven at least for a minimum actuation amount, which is preliminarily set, even in a case where an operation switch for driving the motor is turned off.

3. The state memorizing device for the movable member according to claim 1, wherein the movable member is a seat cushion.

4. The state memorizing device for the movable member according to claim 1, wherein the movable member is a seat-back.

5. A state memorizing device for a movable member, comprising:

a lock state determining portion for determining whether or not the movable member, which is driven by a motor, is in a locked state, on the basis of a motor current supplied to the motor;

an initial positional information memorizing portion for memorizing an initial positional information indicative of a current position of the movable member before the motor is started;

a current positional information calculating portion for calculating a current positional information indicating the current position of the movable member on the basis of the position indicated by the initial positional information and the motor current, the current position of the movable member changes in response to an actuation of the motor;

a lock detection area setting portion for setting a lock detection area so that a predetermined distance is included within a range of movement of the movable member at least at a rear side in a front-rear direction of a vehicle body with reference to a previous lock detection area, at which the locked state of the movable member is detected; and

a current positional information correcting portion for determining the current position of the movable member on the basis of the previous lock detected position in a case where the motor is stopped while the movable member is positioned within the lock detection area, irrespective of the current positional information calculated by the current positional information calculating portion after the motor is started.

6. The state memorizing device for the movable member according to claim 5, wherein the current positional information correcting portion determines the current position of the movable member on the basis of the initial positional information in a case where the movable member is moved into the lock detection area from outside thereof.

7. The state memorizing device for the movable member according to claim 5, wherein the lock detection area is cleared in a case where the motor is driven so as to move the movable member to exceed the lock detection area set at the rear side in the front-rear direction with reference to the lock detected position.

8. The state memorizing device for the movable member according to claim 5, wherein the lock detection area is updated on the basis of the lock detected position in a case where the lock state of the movable member is detected at a position outside of the lock detection area.

9. The state memorizing device for the movable member according to claim 5, wherein the movable member is a seat cushion.

10. The state memorizing device for the movable member according to claim 5, wherein the movable member is a seat-back.