Method of detecting overload state of on-vehicle electric motor and apparatus thereof
First Claim
1. A method of controlling an on-vehicle electric opening/closing body driven by a motor comprising the steps of:
- detecting a variation in a load current of said motor over a predetermined period of time;
establishing at least one threshold value based on an actual voltage being applied to said motor; and
determining an overload state of said motor based on a comparison of said variation in said load current and said threshold value.
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Abstract
A method of controlling an on-vehicle electric opening/closing body includes the steps of detecting an increased amount of driving current of a motor at a predetermined time interval, comparing the increased amount of the driving current, the number of times of continuous increases in driving current, or an accumulated value of the increased amount of the driving current with a predetermined threshold to perform decision of over load, and varying the threshold according to voltage applied to the motor, rotation directions of the motor, or a type of object generating the over load. It is thereby possible to surely detect the over load which is accidentally generated when sliding a sun-roof, a power window, or the like.
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Citations
28 Claims
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1. A method of controlling an on-vehicle electric opening/closing body driven by a motor comprising the steps of:
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detecting a variation in a load current of said motor over a predetermined period of time; establishing at least one threshold value based on an actual voltage being applied to said motor; and determining an overload state of said motor based on a comparison of said variation in said load current and said threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for controlling an on-vehicle opening/closing body, comprising:
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a motor for driving said opening/closing body; current detecting means for detecting a variation in a load current of said motor over a predetermined period of time; voltage detecting means for detecting an actual voltage being applied to said motor; establishing means for establishing at least one threshold value based on said actual voltage being applied to said motor; and overload determining means for determining an overload state of said motor based on a comparison of said variation in said load current and said threshold value. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus for controlling an on-vehicle opening/closing body of claim 29, wherein said establishing means comprises,
means for establishing a plurality of second threshold values based on said voltage being applied to said motor and on hardness of objects generating said overload, and means for selecting one of said plurality of said second threshold values as said threshold value based on said variation in load current within a predetermined period of time.
Specification