Opening and closing member control system
View Patent ↗An opening and closing member control system includes a rotation sensing device, which outputs a pulse signal synchronously to a movement of a window glass, and a controller, which senses pinching of an object by an opening and closing member based on the pulse signal. The controller has leaning stored data Δω m based on the pulse signal. The controller computes a rotational speed difference Δω at a current position of the window glass based on the pulse signal while the window glass is driven in a closing direction. The controller computes a difference between the rotational speed difference Δω and leaning stored data Δω m in such a manner that the controller determines whether the pinching of the object based on a comparison between the difference and a pinching determining threshold value β.
1. An opening and closing member control system comprising:
a drive means for driving an opening and closing member in an opening direction and a closing direction;
a moving speed sensing means for outputting a speed measurement signal, which indicates a moving speed that corresponds to movement of the opening and closing member driven by the drive means; and
a pinching sensing means for sensing pinching of an object by the opening and closing member based on the speed measurement signal, wherein:
the pinching sensing means prestores a plurality of first amounts of change in the moving speed, each of which is computed based on the speed measurement signal that is previously received while the opening and closing member is driven in the closing direction, each of the plurality of first amounts of change in the moving speed being associated with a corresponding one of a plurality of divided ranges, into which a moving range of the opening and closing member is divided, the opening and closing member being movable within the moving range, each of the plurality of first amounts of change in the moving speed serving as learning stored data;
the pinching sensing means computes a second amount of change in the moving speed at a current position of the opening and closing member based on the speed measurement signal that is received while the opening and closing member is driven in the closing direction;
the pinching sensing means computes a difference between the second amount of change in the moving speed and the learning stored data, which is associated with one of the plurality of divided ranges that corresponds to the current position of the opening and closing member; and
the pinching sensing means confirms the pinching of the object by the opening and closing member by a comparison between the difference and a pinching determining threshold value.
2. The opening and closing member control system according to claim 1 wherein:
the pinching sensing means senses a start of the pinching of the object when the difference exceeds a change determining threshold value;
the pinching sensing means computes a total amount of the difference since time of sensing the start of the pinching of the object; and
the pinching sensing means confirms the pinching of the object by the opening and closing member when the total amount exceeds the pinching determining threshold value.
3. The opening and closing member control system according to claim 1 , wherein the pinching sensing means increases the pinching determining threshold value on a negative side when the difference exceeds a disturbance determining threshold value that is set on a positive side.
4. The opening and closing member control system according to claim 1 , wherein:
the drive means includes a motor;
the moving speed sensing means outputs a rotational speed signal of the motor as the speed measurement signal; and
the pinching sensing means uses an amount of change in the rotational speed of the motor per unit interval, which is computed based on the rotational speed signal, as the amount of change in the moving speed.
5. The opening and closing member control system according to claim 1 , wherein the pinching determining threshold value is corrected based on the difference.
6. The opening and closing member control system according to claim 1 , wherein the opening and closing member is a window panel of a vehicle.
7. An opening and closing member control system comprising:
a drive means for driving an opening and closing member in an opening direction and a closing direction;
a moving speed sensing means for outputting a speed measurement signal, which indicates a moving speed of the opening and closing member and a position of the opening and closing member in a movable range, within which the opening and closing member is movable; and
a pinching sensing means for sensing pinching of an object by the opening and closing member based on the speed measurement signal, wherein:
the pinching sensing means includes a memory that stores data map indicating a relation between (a) a first amount of change in the moving speed of the opening and closing member and (b) the position of the opening and closing member in the movable range while the opening and closing member is driven in the closing direction;
the pinching sensing means computes a second amount of change in the moving speed at a current position of the opening and closing member based on the speed measurement signal that is received while the opening and closing member is driven in the closing direction;
the pinching sensing means computes a difference between (a) the second amount of change in the moving speed of the current position and (b) the first amount of change in the moving speed stored in the memory, the first amount being learned based on the current position of the opening and closing member by referring to the map data; and
the pinching sensing means confirms the pinching of the object by the opening and closing member by a comparison between the difference and a pinching determining threshold value.
8. The opening and closing member control system according to claim 7 wherein:
the pinching sensing means senses a start of the pinching of the object when the difference exceeds a change determining threshold value;
the pinching sensing means computes a total amount of the difference since time of sensing the start of the pinching of the object; and
the pinching sensing means confirms the pinching of the object by the opening and closing member when the total amount exceeds the pinching determining threshold value.