Opening/closing member control apparatus and method for detecting pinching
View Patent ↗A power window device includes window glass, an elevating mechanism, and a control device for detecting pinching of a foreign object by the window glass. The control device calculates an amount (a rotation speed variation ΣΔω α ) of the pinching based on a variation amount of an opening/closing speed of the window glass, and estimates the amount (a rotation speed variation ΣΔω β ) of the pinching before the opening/closing speed changes due to the pinching. The control device determines the pinching of the foreign object based on these pinching calculation and estimation amounts.
1. An opening/closing member control apparatus comprising:
an opening/closing member;
a driving part to drive the opening/closing member to be opened or closed; and
a pinching detecting part to detect pinching of a foreign object by the opening/closing member while the opening/closing member is driven to be opened or closed, wherein the pinching detecting part includes:
a pinched amount calculating means for calculating an amount of the pinching of the foreign object by the opening/closing member;
a pinched amount estimating means for estimating the amount of the pinching before the pinched amount calculating means calculates the amount of the pinching, in a state in which the foreign object is pinched by the opening/closing member; and
a pinching determining means for determining the pinching of the foreign object, based on a pinching calculation amount that is calculated by the pinched amount calculating means, and a pinching estimation amount that is estimated by the pinched amount estimating means, wherein the pinching determining means determines the pinching of the foreign object based on a sum of the pinching calculation amount and the pinching estimation amount in comparison to a predetermined pinching determination threshold.
2. The opening/closing member control apparatus according to claim 1 , wherein the pinched amount calculating means calculates the amount of the pinching based on a variation of a rotation speed of the driving part to drive the opening/closing member to be opened or closed by a rotary drive.
3. The opening/closing member control apparatus according to claim 1 , wherein the pinched amount estimating means calculates the pinching estimation amount based on the pinching calculation amount, which is calculated by the pinched amount calculating means.
4. The opening/closing member control apparatus according to claim 1 , wherein the pinched amount estimating means estimates the amount of the pinching based on a variation of a rotation speed of the driving part to drive the opening/closing member to be opened or closed by a rotary drive.
5. The opening/closing member control apparatus according to claim 4 , wherein:
the pinched amount estimating means estimates the amount of the pinching as a result of multiplying an average rotation speed difference of the rotation speed by a predetermined number of pulse signals, which are synchronized with the rotation of the driving part; and
the average rotation speed difference is an average of the variation of the rotation speed of the driving part between a present pulse count of pulse signals and a predetermined pulse count of pulse signals before the present pulse count.
6. The opening/closing member control apparatus according to claim 5 , wherein the predetermined number of pulse signals is set differently according to a magnitude of the average rotation speed difference.
7. An opening/closing member control apparatus comprising:
an opening/closing member;
a driving part to drive the opening/closing member to be opened or closed; and
a pinching detecting part to detect pinching of a foreign object by the opening/closing member while the opening/closing member is driven to be opened or closed, wherein the pinching detecting part includes:
a pinched amount calculating means for calculating an amount of the pinching of the foreign object by the opening/closing member;
a pinched amount estimating means for estimating the amount of the pinching before the pinched amount calculating means calculates the amount of the pinching, in a state in which the foreign object is pinched by the opening/closing member, wherein
the pinched amount estimating means estimates the amount of the pinching based on a variation of a rotation speed of the driving part to drive the opening/closing member to be opened or closed by a rotary drive,
the pinched amount estimating means estimates the amount of the pinching as a result of multiplying an average rotation speed difference of the rotation speed by a predetermined number of pulse signals, which are synchronized with the rotation of the driving part; and
the average rotation speed difference is an average of the variation of the rotation speed of the driving part between a present pulse count of pulse signals and a predetermined pulse count of pulse signals before the present pulse count; and
a pinching determining means for determining the pinching of the foreign object, based on a pinching calculation amount that is calculated by the pinched amount calculating means, and a pinching estimation amount that is estimated by the pinched amount estimating means.
8. The opening/closing member control apparatus according to claim 7 , wherein the predetermined number of pulse signals is set differently according to a magnitude of the average rotation speed difference.