Method of and apparatus for opening/closing control of motor-driven opening/closing member of vehicle
First Claim
1. A method of controlling opening/closing of a motor-driven movable member of a vehicle comprising the steps of:
- detecting a driving current of a motor for driving the movable member, at predetermined detecting intervals;
calculating a change in the driving current at each of the detecting intervals;
adding the change in the driving current in successive detection intervals to provide a total current change value;
comparing the total current change value with a previously set overload threshold value and performing one of stopping the motor and stopping the motor after reversing rotation of the motor, when the total current change value is not smaller than the overload threshold value; and
determining the detecting interval or the overload threshold value on the basis of environmental conditions.
1 Assignment
0 Petitions
Accused Products
Abstract
An opening/closing control apparatus detects an overload placed on a movable member of a vehicle such as a sunroof and a power window while it is sliding. Further, it prevents overload detecting operation (reversing motion) from being made by a cause other than an overload. A control processor circuit compares a driving current value of a motor detected at predetermined intervals with a preset current value and corrects an overload threshold value to a threshold value of higher value when the driving current value detected when a first predetermined time period has passed after the start of the motor does not exceed the preset current value. Thereafter, the control processor circuit determines that an overload has occurred when a change in the driving current value has exceeded the overload threshold value.
53 Citations
17 Claims
-
1. A method of controlling opening/closing of a motor-driven movable member of a vehicle comprising the steps of:
-
detecting a driving current of a motor for driving the movable member, at predetermined detecting intervals; calculating a change in the driving current at each of the detecting intervals; adding the change in the driving current in successive detection intervals to provide a total current change value; comparing the total current change value with a previously set overload threshold value and performing one of stopping the motor and stopping the motor after reversing rotation of the motor, when the total current change value is not smaller than the overload threshold value; and determining the detecting interval or the overload threshold value on the basis of environmental conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An apparatus for controlling opening/closing of a motor-driven movable member of a vehicle comprising:
-
a motor for driving said movable member; current detection means for detecting a driving current for said motor; a control circuit calculating a change in the driving current detected by said circuit detection means at predetermined detecting intervals, outputting one of a stop signal to cause said motor to stop and a reverse signal to cause said motor to reverse, when the change has exceeded a previously set overload threshold value, said control circuit further responsive to start operation of the motor to monitor a masking period and, after the masking period has passed, compare the driving current with a previously set value for selecting a higher overload threshold value from stored overload threshold values when the driving current value is not smaller than the present current value; and a driving circuit responsive to said control circuit for driving said motor. - View Dependent Claims (13, 14, 15, 16)
-
-
17. An apparatus for controlling opening/closing of a motor-driven movable member of a vehicle comprising:
-
a motor for driving said movable member; current detection circuit for detecting a driving current for said motor; a control circuit for calculating a change in the driving current detected by said currentdetection circuit at predetermined detecting intervals, for outputting one of a stop signal to cause said motor to stop and a reverse signal to cause said motor to reverse, when the change has exceeded a previously set overload threshold value, said control circuit determining when a masking period has passed after the start of said motor and then compares the detected driving current value with a preset current value for correcting the overload threshold value to a higher value when the driving current value is not smaller than a preset current value, said control circuit further comparing each of applied voltage to said motor, the driving current for said motor, and ambient temperature with a respective preset value, and establishing second detecting interval longer than the previously set detecting interval when at least one of the applied voltage and the ambient temperature does not exceed the respective preset value and when the driving current is not smaller than the preset current value; and a driving circuit responsive to said control circuit for driving said motor.
-
Specification