JPH06197591A - Controlling device for drive of motor - Google Patents

Abstract

PURPOSE:To prevent the continuation of the overloading state of a motor irrespective of the temperature of the motor, whether low or high in temperature. CONSTITUTION:A jammed-foreign matter detection/control circuit 66 performs foreign matter detection when a low-level signal is inputted from a comparator 86 and does not perform the detection when a high-level signal (inhibit signal) is inputted at a temperature equal to or lower than a prescribed temperature (-10 deg.C to -20 deg.C). The resisting force of door glass increases at the moving time due to the malfunction of a window regulator or hardness variation of weather strips. Thus the unnecessary operation of the circuit 66 is prevented by stopping the jammed-foreign matter detection of the circuit 66 at a low- temperature time, because the driving current of a motor 22 which increases due to the resisting force exceeds a comparing current at the same level as that at a normal-temperature time in the case the circuit 66 tries to perform the foreign matter detection with a comparing current when the resisting force increases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive control device for moving (elevating) a movable part disposed in a vehicle, for example, a door glass of a power window device by a driving force of a motor.

[0002]

2. Description of the Related Art For example, a motor is applied to a power window device for moving up and down a door glass.

Generally, a manual switch and an automatic switch are provided as a power window switch on the driver side.

In the manual switch, the up-side or down-side contact is turned on only while the occupant is operating it, and when the operation is stopped, it is automatically restored and turned off. That is, since the driving of the motor is continued only while the occupant is operating, the door glass can be stopped during the ascent or descent.

On the other hand, in the auto switch, when the up or down side contact is turned on, the motor continues to be driven even if the hand is released, and the door glass is moved until it is fully closed or fully opened. Here, when the door glass is fully closed, the movement is blocked by the window frame or the like, so that the drive current of the motor increases. When this drive current exceeds a predetermined value, or
It has been considered to stop the driving of the motor when foreign matter is present on the upward movement trajectory of the door glass and an abnormal current due to the foreign matter being caught is detected. In this case, in order to distinguish between the fully closed state and the foreign matter trapped, a fully closed detection sensor that detects that the door glass is near the fully closed state is provided. Further, when the foreign matter is caught, it is possible to reverse the motor for a predetermined time.

[0006]

However, in the operation of the door glass, the load changes depending on the temperature of the operating environment of the door glass, so that the drive current of the motor changes according to the change of the load. That is, when the temperature becomes low (especially in the vicinity of the sub-zero temperature), icing and dew condensation occur, the movement of the regulator mechanism becomes sluggish, and the weather of the guide portion of the door glass (window frame, rubber weather strip, etc.) The movement of the door glass is hindered by the change in hardness of the rubber member such as the strip. Therefore, before the door glass is fully closed, or even if there is no trapping of foreign matter, it is determined that the detection level or abnormal current corresponds to the lock current when fully closed, and the motor drive is stopped. There is a possibility that it may be recognized, and there arises a problem that the door glass cannot be fully closed at a low temperature.

It is possible to set the threshold value for recognizing the abnormal current to a higher value in accordance with the low temperature condition, but the difference between the motor drive current at low temperature and the motor lock current at normal temperature is small. However, it is difficult to set the threshold value, and the threshold value becomes higher than the motor lock current at normal temperature or high temperature, and the overloaded state of the motor may be continued.

In view of the above facts, an object of the present invention is to obtain a motor drive control device capable of preventing a motor from being continuously overloaded regardless of whether the motor temperature is low or high.

[0009]

According to a first aspect of the present invention, there is provided a motor drive control device for moving a movable portion arranged in a vehicle by a driving force of a motor, wherein a current at the time of driving the motor is controlled. Current detecting means for detecting and comparing the current value detected by the current detecting means when the movable part is moved with a preset comparison current value, and when the predetermined current value is exceeded, the drive state of the motor And a comparison current changing unit that changes the comparison current value when the temperature in the operating environment of the movable portion is lower than a predetermined temperature.

[0010]

According to the first aspect of the present invention, when the movable portion is moved by the driving force of the motor, the motor lock current is substantially constant if the operating environment is room temperature. By comparing the comparison current value and the current value detected by the current detection means, the drive state of the motor can be controlled depending on whether or not the comparison current is exceeded.

The motor lock current is small when the temperature of the operating environment is high, and is high when the temperature is low.

On the other hand, also in the movable part, when the temperature of the operating environment is high, the operating resistance is relaxed and the driving current of the motor is low, and when the temperature is low, the operating resistance is increased and the driving current of the motor is high. The amount of change due to the influence of the frictional force with the member that supports the movable portion (for example, the influence of the frictional force caused by the sliding of the door glass as the movable portion and the rubber guide member of the window frame in the power window device). Is much larger than the motor lock current.

Therefore, the comparison current changing means changes the comparison current, which is larger than the normal motor drive current and smaller than the motor lock current, at a predetermined temperature in the operating environment of the movable part. That is, for example, when the operating environment temperature is higher than the predetermined temperature, the comparison current is reduced, and when the operating environment temperature is lower than the predetermined temperature, the comparison current is increased to a current value at which the motor current increased by the resistance due to the frictional force or the like is not detected.

As a result, when the movable state of the movable portion is recognized by the drive current of the motor, it is possible to compare with a proper comparison current regardless of the environmental temperature, and the comparison current always exceeds the motor lock current. Without, temperature compensation of the motor itself can be ensured.

[0015]

[First Embodiment] FIG. 2 shows a door 12 on the driver's seat side of a vehicle to which a power window device 10 according to the first embodiment is applied, and one door 14 of a rear seat. There is. Inside each door (inside the driver's seat door 12 in FIG. 3), a window regulator unit 16 for raising and lowering the door glass 20 is disposed.

As shown in FIG. 3, the window regulator portion 16 is a so-called wire type in the first embodiment, and the wire is wound around the rotary plate 22A attached to the drive shaft of the motor 22. ing. The end of this wire is connected to a holding channel 24 that supports the lower end of the door glass 20.
Is attached to the main guide 26 so as to be vertically movable. As a result, when the motor 22 rotates in the forward and reverse directions,
This rotational driving force is transmitted through the wire, and the door glass 20 moves up and down along the glass guide 18. The configuration of the window regulator unit 16 is
Not limited to such a wire type, an X arm type or a so-called motor self-propelled type in which the motor itself moves along the rack may be used.

When the door glass 20 is lifted by the motor 22, the peripheral edge portion of the door glass 20 is a rubber weather strip (not shown) in the frame 12A of the door 12.
And the opening of the door frame 12A is closed. Further, when the door glass 20 is moved downward by the rotational driving of the motor 22, the opening of the frame 12A of the door 12 is opened.

The motor 22 includes a door 12 shown in FIG.
Power window master switch 3 attached to 14
0 and the door switch 32 are operated. The door switch 32 is attached to the door 14 other than the driver seat side, and the power window master switch 30 is attached to the door armrest portion 12B of the driver seat side door 12. The power window master switch 30 may be attached at any other position as long as it can be easily operated by the driver sitting in the driver's seat.

The power window master switch 30 includes an auto / manual switch 34 for automatically or manually operating the motor 22 of the door 12 and a door switch 36 (mainly for manually operating the motor 22 of each door 14). 3 pieces are arranged in the first embodiment. Further, the power window master switch 30 includes a lock switch 38 for preventing the motor 22 from driving even if the door switches 32, 36 are operated.
Is provided.

As the auto / manual switch 34, for example, a switch that can be operated in two stages in both directions can be applied.
In the case of the one-step operation, the motor 22 of the door 12 is driven only during the operation (manual operation), and the two-step operation causes the motor 22 to be driven until the door glass 20 reaches a predetermined position even when the hand is released from the switch. Is performed (automatic operation).

The motor 22 is driven when the power window master switch 30 or the door switch 32 is operated to rotate the rotary plate 22A (shown in FIG. 3) in either forward or reverse directions to raise the door glass 20. Or it can be lowered.

FIG. 1 shows a power window control unit 50 for controlling the driving of the motor 22 by operating the auto / manual switch 34. The power window control unit 50 is driven by the power supply from the power supply circuit 51. It should be noted that the operation of the door switch 32 has the same configuration and will not be described.

As shown in FIG. 1, the power window control section 50 is connected to a signal line 52 from each switch of the auto / manual switch 34.
Depending on the operating state of the manual switch 34, the motor 2
A drive current for forward rotation and reverse rotation is sent to 2.

The power window control unit 50 includes a current detection sensor 54 for detecting a current when the motor 22 is driven.
Signal line 56 from is connected and door glass 20
A signal line 60 from the fully closed detection sensor 58 for detecting the upper end position (see FIGS. 1 and 2), that is, the fully closed state is connected. The fully closed detection sensor 58 is used for the door glass 20.
Is turned on (high-level signal output) in the vicinity of fully closed, and turned off (low-level signal output) otherwise.

The power window control unit 50 recognizes that the door glass 20 is in the fully closed state when the drive current value of the motor 22 is the lock current value and the fully closed detection sensor 58 is turned on, and the power window control unit 50 detects that the motor 22 is in the fully closed state. When the drive current is stopped, and the lock current value and the full-closed detection sensor 58 are off, it is recognized that the door glass 20 is fully opened, and the drive of the motor is stopped.

A pinch detection / control circuit 62 is connected to the power window controller 50 by a signal line 64. The entrapment detection / control circuit 62 has a function of sending an abnormal signal to the power window control unit 50 when a foreign object is entrapped while the door glass 20 is rising.

That is, the pinch detection / control circuit 62 is connected to the signal line 56 from the current detection sensor 54 and the signal line 60 from the fully closed detection sensor 58 as in the power window control section 50.

The entrapment detection / control circuit 62 stores in advance a comparative current value for detecting entrapment, and the detected drive current value of the motor 22 while the door glass 20 is rising is the comparative current value. When the value exceeds the value and the full-closed detection sensor 58 is off, it is recognized that the jamming has occurred, and an abnormal signal is output to the power window control unit 50.

In the power window control unit 50, when an abnormal signal is input, the driving (normal rotation) of the motor 22 is immediately stopped, and the door glass 20 is slightly lowered (the motor 2).
2).

A comparison current value changing circuit 66 is connected to the entrapment detection / control circuit 62. The comparison current value changing circuit 66 includes the power supply line 6 from the power supply circuit 51.
8 are connected to the thermistor 70 and one end of the resistor 72, respectively. The other end of the thermistor 70 is connected to one end of the resistor 74, and the other end is connected to the ground wire 76. On the other hand, the other end of the resistor 72 is connected to one end of the resistor 78, and the other end is connected to the ground wire 80.

Between the resistors 72 and 78 and the thermistor
The branch lines 82 and 84 from between 70 and the resistor 74 are branched.
And the positive side input terminal 86 of the comparator 86, respectively.
A and the negative side input terminal 86B are connected. this
Therefore, the resistor 72 and the resistor 7 are connected to the positive side input terminal 86A.
Potential V divided by 8 and₁(Constant value) is entered and
The thermistor 70 and the resistor 74 are connected to the eggplant-side input terminal 86B.
Potential V divided by and ₂(Variation) will be input
It

The output terminal 86C of the comparator 86
Are connected to the entrapment detection / control circuit 62.

Here, the resistance values of the resistors 72, 74 and 78 are constant, but the resistance value of the thermistor 70 changes depending on the temperature. The thermistor 70 of the first embodiment
Indicates a negative temperature characteristic, and the resistance value R ₀ of the thermistor 70 is expressed by the following equation.

R ₀ = R ′ × EXP {B × (1 / T−1 / T ′)} [Ω] (1) where R ′ is a resistance value at temperature T ′, and T ′ is 0
C (or normal temperature) B: A constant (thermistor constant) that governs sensitivity.

Therefore, the resistance value R of the thermistor 70
_{Since 0} has a low resistance value at room temperature or high temperature and a high resistance value at low temperature, the potential V ₂ is at a predetermined temperature (−10 ° C. to −20).
Temperature is higher than the potential V ₁ , the output of the comparator 86 is at a low level (prohibition signal non-output state), and below the predetermined temperature is lower than the potential V _{1 and} the output of the comparator 86 is at a high level. (Prohibition signal output status)
(See FIG. 4).

In the entrapment detection / control circuit 66, when a low-level signal is input from the comparator 86, the comparison current value and the drive current value of the motor 22 are compared to detect entrapment of a foreign matter, and a high level is detected. When the level signal is input, that is, when the inhibition signal is input, the comparison between the comparison current and the drive current of the motor 22 is inhibited. That is, in the entrapment detection / control circuit 66 of the first embodiment, the predetermined temperature (-10
(° C to -20 ° C) or less, the trapping detection is not performed (see FIG. 5).

Here, the door glass 20 is moved up and down by mechanical driving of the window regulator 16, and the door glass 20 is moved up and down while the peripheral edge of the door glass 20 is sandwiched between rubber weather strips in the drive frame 12A. Therefore, at low temperature (about −10 ° C. to −20 ° C.), the resistance during movement increases due to malfunction of the window regulator 16 and hardness change of the weather strip. If it is attempted to detect entrapment with the comparison current at the same level as that at room temperature when the resistance force increases, the drive current of the motor 20 that increases due to the resistance force may exceed the comparison current.
In the first embodiment, the unnecessary operation is prevented by stopping the trapping detection at the low temperature.

Next, the operation of the first embodiment will be described with reference to the flow chart shown in FIG. First, drive control of the power window in the power window control device 50 will be described.

When manually raising the door glass 20, the manual up on / off switch is turned on in step 200, a positive determination is made, the process proceeds to step 202, the motor 22 is normally rotated, and the flag F is reset in step 203 ( 0) This allows the door glass 2
0 starts rising. In the next step 204, since the on / off switch for automatic switching is in the off state, a negative determination is made and the process returns to step 200. After that, when the manual up on / off switch is in the on state, step 200,
202, 203, 204 are repeated.

Next, when the hand is released from the manual-up on / off switch 52A, it is turned off, and a negative determination is made in step 200, and the routine proceeds to step 206. In step 206, since the flag F is reset (0), a negative determination is made and the process proceeds to step 209. In step 209, the driving of the motor 22 is stopped, the flag F is reset in step 210 (at this time, the flag F is in the reset state), and the process proceeds to step 212.

In step 212, it is determined whether or not the manual-down on / off switch is turned on. Therefore, a negative determination is made at this time, and the routine proceeds to step 214. In step 214, since the flag F is reset, a negative determination is made and the process proceeds to step 216, the drive of the motor 22 is stopped (at this time, the motor 22 is already stopped), and the flag F is set in step 218. After the reset, the process returns to step 200.

Thereafter, if the switch is not operated while the power is on, the step 20 is repeated until the manual-up on / off switch (step 200) or the manual-down on / off switch (step 212) is operated.
0, 206, 209, 210, 212, 214, 21
6, 218 are repeated (basic flow).

Next, when manually lowering the door glass 20, the manual down on / off switch is turned on in step 212, a positive determination is made, the process proceeds to step 220, the motor 22 is rotated in the reverse direction, and step 22
At 1, the flag F is reset (0). This causes the door glass 20 to start descending. At the next step 222, since the on / off switch 52C for automatic switching is in the off state, a negative determination is made and the process returns to step 212. Thereafter, when the manual down on / off switch 52B is in the on state, steps 212, 220, 221, 222 are repeated.

Next, when the hand is released from the manual-down on / off switch, the switch turns off, and the flow is the same as the above-mentioned power-on state and no switch operation (basic flow).

Here, when the door glass 20 is automatically raised, the auto / manual switch 34 is operated in two steps (the on / off switch for automatic switching is turned on). After 203, an affirmative decision is made in step 204, the routine proceeds to step 224, the flag F is set (1), and then the routine proceeds to step 225, where the motor drive current Im is taken in,
Then compares the detection level I _L corresponding to the motor drive current Im and the lock current in step 227 (Im:
I _L ).

If Im <I _L at step 227, the routine proceeds to step 212, where it is judged if the auto / manual switch 34 has been operated to the manual down side. That is, even during the automatic ascent, when the manual down on / off switch 52B is turned on, the motor 22 is immediately reversely rotated and the above-described manual down operation is performed.

If the determination in step 212 is negative, the automatic operation is continued and the process proceeds to step 214. In step 214, since the flag F is set, an affirmative determination is made, the process returns to step 225, and the following steps 225,
227, 212, and 214 are repeated. Here, when Im ≧ I _L is determined in step 227, the process proceeds to step 209, the driving of the motor 22 is stopped, and the flag F is reset in step 210. After that, the basic flow described above is performed.

When the door glass 20 is automatically lowered, the auto / manual switch 34 is operated in two steps, so that after the motor starts to rotate normally in step 220, a positive determination is made in step 222 through step 221. Go to step 228, set flag F (1)
After that, the process proceeds to step 230 and the motor drive current Im
In step 234, the motor drive current I
m is compared with the detection level I _L corresponding to the motor lock current (Im: I _L ).

If Im <I _L at step 234, the routine proceeds to step 200, where it is judged if the auto / manual switch 34 has been operated to the manual up side. That is, even during the automatic lowering, when the manual-up on / off switch 52A is turned on, the motor 22 is immediately rotated in the forward direction, and the above-described manual-up operation is performed.

If the determination in step 200 is negative, the automatic operation is continued and the routine proceeds to step 206. In step 206, since the flag F is set, an affirmative determination is made, and the process returns to step 230.
234, 200, and 208 are repeated. Here, when Im ≧ I _L is determined in step 234, it is determined that the door glass is fully opened, and the process proceeds to step 216 and the motor 2 is operated.
2 is stopped, and the flag F is reset in step 218. After that, the basic flow described above is performed.

Here, when an abnormal signal is input from the entrapment detection / control circuit 62 to the power window control circuit 50, an interrupt is immediately issued to enter the entrapment interrupt control shown in FIG. The trapping interrupt routine will be described below.

As shown in FIG. 7, in step 300, the driving of the motor 22 is stopped, and then in step 30.
At 2, the motor 22 is reversed. As a result, the door glass 20 which is being raised is lowered, and the foreign matter that has been caught is not clamped by the door glass 20 and the window frame 12A with a strong force, and damage and the like can be prevented.

In the next step 304, it is judged whether or not a predetermined time has elapsed, and if an affirmative judgment is made, step 30
The process proceeds to 6 and the driving (reverse rotation) of the motor is stopped. As a result, the door glass 20 is stopped in a state of being lowered by a predetermined amount (about 50 mm), and the foreign matter can be easily taken out.
After that, if the closing operation is prohibited for a certain period of time in step 308 and the closing operation input (manual up switch ON state) continues (negative determination in step 310), the process returns to step 308, and the closing operation input is changed. The closing operation is prohibited until there is no more (affirmative determination in step 310).
When the entrapment control is completed, the flow returns to the basic flow of the main routine of FIG.

Next, the abnormal signal output control in the entrapment detection / control circuit 62 will be described with reference to the flowchart of FIG.

In step 350 shown in FIG. 8, it is determined whether or not the door glass 20 is rising. That is, the entrapment of foreign matter occurs during the raising of the door glass 20, and in the other cases, the following processing is not performed. Step 350
If the affirmative determination is made in step S352, the process proceeds to step 352, the drive current Im of the motor 22 is acquired, and then in step 354, it is compared with the comparison current Ic stored in advance.

If Im <Ic is determined in step 354, it is determined that no foreign matter is caught, and the process returns to step 350. In step 354, Im ≧ I
If it is determined to be c, the motor 2
It is determined that the driving force of No. 2 is under load, and the process proceeds to step 356.

In step 356, it is determined whether or not the prohibition signal is input, and if it is not input, the process proceeds to step 358 and an abnormal signal is output to the power window control unit 50. If the prohibition signal is input in step 356, the abnormal signal is not output even if the motor drive current Im exceeds the comparison current Ic, and the process returns to step 350.

This prohibition signal is sent to the comparison current value changing circuit 66.
Is output from the output terminal 86C of the comparator 86.

That is, the resistance value R of the thermistor 70.
_{Since 0} has a low resistance value at room temperature or high temperature and a high resistance value at low temperature, the potential V ₂ is at a predetermined temperature (−10 ° C. to −20).
Temperature is higher than the potential V ₁ , the output of the comparator 86 is at a low level (prohibition signal non-output state), and below the predetermined temperature is lower than the potential V _{1 and} the output of the comparator 86 is at a high level. (Prohibition signal output status)
(See FIG. 4).

As a result, a predetermined temperature (-10 ° C to -2)
Below 0 ° C, the trapping is not detected and the temperature is low (about-).
(10 ° C. to −20 ° C.), it is possible to prevent an unnecessary operation of pinching control due to an increase in resistance force during movement due to a malfunction of the window regulator 16 or a change in hardness of the weather strip, and the door glass 20 is kept at a low temperature. It is possible to solve the problem that the will not close.

[Second Embodiment] The first embodiment has been described with respect to the configuration in which the detection level of foreign matter trapping in the trapping detection / control circuit 62 is changed (with or without detection). It is also applicable to the detection level change applied when the drive is stopped.

That is, in the first embodiment, the motor 20 is stopped by comparing it with a constant detection level corresponding to the lock current, but the motor lock current also changes with temperature (see FIG. 5). Therefore, if a constant detection level is stored, there is a possibility that the motor will continue to be driven in an overloaded state at low temperatures.

Therefore, in the second embodiment, the detection level stored in advance is switched between the high level and the low level. Such a change in the level of the comparison current is performed in FIG.
This can be achieved by using the comparison level changing circuit 100 shown in FIG. The comparison level changing circuit 100 will be described below with reference to FIG. 9. The same components as those in FIG. 3 are designated by the same reference numerals, and the description of the configuration will be omitted. (No detection)).

As shown in FIG. 9, the comparison level changing circuit 100 is composed of a first circuit 100A and a second circuit 100B, and the first circuit 100A has the same structure as the above-mentioned comparison current value changing circuit 66. The output terminal 86C of the first comparator 86 outputs a high-level or low-level signal according to the resistance change (temperature change) of the thermistor 70.

Output terminal 8 of this first comparator 86
6C is connected to the anode side of the diode 102, and the cathode side of the diode 102 is connected to the second circuit 100B.
Is connected to the negative side input terminal 104B of the second comparator 104 in FIG. The potential V ₃ generated by the motor drive current flowing through the resistor 106 is input to the positive input terminal 104A of the second comparator 104.

That is, both ends of the motor 22 are connected to the common terminal 108A of the relay switch 108, and the respective first contacts 108B are connected to the power supply line.
The second contact 108C is connected to the resistor 106 and the positive side input terminal 104A of the second comparator 104, respectively.
Is connected between and. The contacts of the relay switch 108 are switched by coils 110 and 112, and the motor 22 is configured to rotate normally and reversely by exciting one of the coils 110 and 112.

Further, between the output terminal 86C of the first comparator 86 and the diode 102, the other end of the resistor 114, one end of which is connected to the power supply line, is connected. Also,
Between the diode 102 and the second comparator 104, the other end of the resistor 116 whose one end is connected to the power supply line is connected. The other end of the resistor 116 is grounded via the resistor 118.

Therefore, the input potential V ₄ of the negative side input terminal 104B of the second comparator 104 is changed by the output signal from the first comparator 86. That is, when the output signal is at a low level (at room temperature), the potential is divided by the resistors 116 and 118,
If the output signal is high level (at low temperature), the resistance 11
Divided is become potential 4,116,118, the potential V ₃ comparison potential V ₄ for comparison with is adapted to be changed.

The second comparator 104 outputs a high-level signal (abnormal signal) to the power window control unit 50 when detecting the entrapment of foreign matter (V ₄ ≤V ₃ ),
If not detected (V ₄ > V ₃ ), a low level signal is output. That is, as shown in FIG. 10, the detection level (current value) when the motor 22 is driven shows that the temperature is -10.
It becomes extremely large below -20 ° C, and it is a window frame 1 at low temperature.
It can be made larger than the motor drive current due to the resistance force of 2 A or the like. Further, since the detection level is low at room temperature, it can be lower than the motor lock current.

As described above, the comparative potential V ₄ is high at low temperatures (-10 ° C. to 20 ° C.) and low at higher temperatures (normal temperature and high temperature), so that the drive current of the motor 22 and the motor lock current are reduced. Can be set so that they do not overlap. Therefore, it is possible to prevent the motor from being driven in the overloaded state regardless of the temperature change.

The comparison current is not limited to two levels, but may be divided into steps according to the temperature change. Further, such a plurality of stages of detection levels may be applied as the detection level at the time of detecting the entrapment of the foreign matter shown in the first embodiment.

[0072]

As described above, the motor drive control device according to the present invention has an excellent effect that it is possible to prevent the overloaded state of the motor from continuing regardless of whether the temperature is low or high.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a power window drive control device according to a first embodiment (with entrapment detection).

FIG. 2 is a perspective view of a vehicle door as viewed from the inside of the vehicle.

FIG. 3 is a perspective view showing an internal structure of a driver side door.

FIG. 4 is a characteristic diagram showing an output state according to a temperature of a prohibition signal.

FIG. 5 is a temperature-motor drive current and lock current characteristic diagram.

FIG. 6 is a control flowchart showing a main routine according to the first embodiment.

FIG. 7 is a control flowchart showing an interrupt routine at the time of pinching according to the first embodiment.

FIG. 8 is a control flowchart showing an entrapment detection control routine according to the first embodiment.

FIG. 9 is a circuit diagram of a power window drive control device according to a second embodiment (without pinch detection).

FIG. 10 is a characteristic diagram of the detection level changed according to the temperature according to the second embodiment.

[Explanation of symbols]

 10 Power Window Drive Controller 22 Motor 50 Power Window Controller 62 Entrapment Detection / Control Circuit 66 Comparative Current Value Change Circuit 70 Thermistor 86 Comparator

Claims (1)

[Claims] 1. A motor drive control device for moving a movable part arranged in a vehicle by a driving force of a motor, comprising: current detection means for detecting a current when the motor is driven; A drive control unit that compares the current value detected by the current detection unit with a preset comparison current value, and controls the drive state of the motor when the predetermined current value is exceeded, and the operation of the movable unit. And a comparison current changing unit that changes the comparison current value when the temperature in the environment is lower than a predetermined temperature.