Vehicle-mounted drive control apparatus
First Claim
1. A vehicle-mounted drive control apparatus for drive-controlling a motor that is supplied with reversible electrical power from a vehicle battery by way of switching devices of a driving circuit and reversibly drives a moving body between a forward limit position and a reverse limit position, the drive control apparatus comprising a microprocessor that cooperates with a nonvolatile program memory and a nonvolatile data memory and a RAM memory for processing and also comprising moving body position detecting means, normal drive control means, motor locked state detecting means, escape drive control means, and escape detecting means, wherein:
- the moving body position detecting means are means for performing calibration at an origin position in relation to the output voltage of a variable resistance linked to the rotation of the motor or the present value of a reversible counter reversibly counting pulses from a rotation sensor and detecting the relative position of the moving body with respect to the forward limit position and the reverse limit position by monitoring the value of at least one or the other of the output voltage of the variable resistance and the present value of the reversible counter;
the normal drive control means are either voltage control means for controlling a duty ratio of the switching devices so that the voltage impressed on the motor is substantially constant even when the power supply voltage of the vehicle battery fluctuates, or current control means for controlling the duty ratio of the switching devices so that the current supplied to the motor detected by a current detecting circuit is substantially constant even when the power supply voltage of the vehicle battery fluctuates;
the locked state detecting means are means for detecting that the motor is in a non-rotating state even though power is being supplied to it;
the escape drive control means are intermittent drive means for, acting when the moving body position detecting means is detecting a position other than the forward limit position and the reverse limit position and the motor locked state detecting means is detecting a locked state of the motor, setting a boosted drive period in which the duty ratio of the switching devices is controlled to pass a predetermined escape drive current greater than the rated current of the motor and a rest period in which the duty ratio of the switching devices is controlled to pass a holding current less than the rated current of the motor or to make the current value 0, and repeating the boosted drive period and the rest period over a range up to a predetermined number of times; and
the escape detecting means are means for detecting that the motor being driven by the escape drive control means has started rotating, and shifting to the normal drive control means.
1 Assignment
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Accused Products
Abstract
A vehicle-mounted drive control apparatus capable of effecting boosted escape running while preventing burnout when a reversible motor driven by way of a transistor bridge circuit encounters an abnormal load. A motor driven by a transistor bridge circuit reversibly drives a moving body between a reverse limit stopper and a forward limit stopper. A variable resistance produces an output signal related to the position of the moving body, and calibration information is read at the positions of the reverse limit position and forward limit position and saved from a microprocessor to a nonvolatile data memory in advance. When during normal drive running of the motor the motor stops at an intermediate position between the forward limit stopper and the reverse limit stopper, escape drive is carried out by the motor being driven alternately with a boosted current above its rated current and a resting current which is small or 0.
28 Citations
24 Claims
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1. A vehicle-mounted drive control apparatus for drive-controlling a motor that is supplied with reversible electrical power from a vehicle battery by way of switching devices of a driving circuit and reversibly drives a moving body between a forward limit position and a reverse limit position, the drive control apparatus comprising a microprocessor that cooperates with a nonvolatile program memory and a nonvolatile data memory and a RAM memory for processing and also comprising moving body position detecting means, normal drive control means, motor locked state detecting means, escape drive control means, and escape detecting means, wherein:
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the moving body position detecting means are means for performing calibration at an origin position in relation to the output voltage of a variable resistance linked to the rotation of the motor or the present value of a reversible counter reversibly counting pulses from a rotation sensor and detecting the relative position of the moving body with respect to the forward limit position and the reverse limit position by monitoring the value of at least one or the other of the output voltage of the variable resistance and the present value of the reversible counter; the normal drive control means are either voltage control means for controlling a duty ratio of the switching devices so that the voltage impressed on the motor is substantially constant even when the power supply voltage of the vehicle battery fluctuates, or current control means for controlling the duty ratio of the switching devices so that the current supplied to the motor detected by a current detecting circuit is substantially constant even when the power supply voltage of the vehicle battery fluctuates; the locked state detecting means are means for detecting that the motor is in a non-rotating state even though power is being supplied to it; the escape drive control means are intermittent drive means for, acting when the moving body position detecting means is detecting a position other than the forward limit position and the reverse limit position and the motor locked state detecting means is detecting a locked state of the motor, setting a boosted drive period in which the duty ratio of the switching devices is controlled to pass a predetermined escape drive current greater than the rated current of the motor and a rest period in which the duty ratio of the switching devices is controlled to pass a holding current less than the rated current of the motor or to make the current value 0, and repeating the boosted drive period and the rest period over a range up to a predetermined number of times; and the escape detecting means are means for detecting that the motor being driven by the escape drive control means has started rotating, and shifting to the normal drive control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vehicle-mounted drive control apparatus for drive-controlling a motor that is supplied with reversible electrical power from a vehicle battery by way of switching devices of a driving circuit and reversibly drives a moving body between a forward limit position and a reverse limit position, the drive control apparatus comprising a microprocessor that cooperates with a nonvolatile program memory and a nonvolatile data memory and a RAM memory for processing and also comprising moving body position detecting means, good source selecting means, normal drive control means, motor locked state detecting means, escape drive control means, and escape detecting means, wherein:
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the moving body position detecting means are means for performing calibration at an origin position in relation to the output voltage of a variable resistance linked to the rotation of the motor or the present value of a reversible counter reversibly counting pulses from a rotation sensor and detecting the relative position of the moving body with respect to the forward limit position and the reverse limit position by monitoring the value of at least one or the other of the output voltage of the variable resistance and the present value of the reversible counter; the good source selecting means have first failure detecting means for detecting any defective contact of the variable resistance or wire-break or short-circuit of its wiring, second failure detecting means for detecting any wire-break or short-circuit of internal or external wiring of the rotation sensor, and relative comparing means for determining whether or not a value proportional to a change in the output voltage of the variable resistance and a change of the present value of the reversible counter are substantially the same, and when the determination of the relative comparing means is that they are not the same and one of the first and second failure detecting means is detecting an abnormal state the other source not being detected as abnormal is selected as a good source, and when the relative comparing means determines that they are not the same but the first and second failure detecting means are both detecting a normal state it determines that there is no good source, and the moving body position detecting means detects the position of the moving body relative to the forward limit position and the reverse limit position on the basis of a variable resistance or rotation sensor determined to be a good source; the normal drive control means are either voltage control means for controlling a duty ratio of the switching devices so that the voltage impressed on the motor is substantially constant even when the power supply voltage of the vehicle battery fluctuates, or current control means for controlling the duty ratio of the switching devices so that the current supplied to the motor detected by a current detecting circuit is substantially constant even when the power supply voltage of the vehicle battery fluctuates; the locked state detecting means are means for detecting that the motor is in a non-rotating state even though power is being supplied to it; the escape drive control means are means for, acting when the moving body position detecting means is detecting a position other than the forward limit position and the reverse limit position and the motor locked state detecting means is detecting a locked state of the motor, controlling a duty ratio of the switching devices to continuously or intermittently pass a predetermined escape drive current above the rated current of the motor for a period of up to a predetermined time; and the escape detecting means are means for detecting that the motor being driven by the escape drive control means has started rotating, and shifting to the normal drive control means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification