JPH0633665A - Driving controller for power window - Google Patents

Abstract

PURPOSE:To prevent the unnecessary operation of a motor by providing a driving control means stopping or inverting the driving of the motor when a value obtained by subtracting voltage variation from current variation exceeds a fixed value. CONSTITUTION:When a current waveform input to the non-inverting input terminal 40A of an amplifier 40 is shown in a graph (A) and the waveform is differentiated by a differentiating circuit section 60, the waveform is shown in a graph (B). The differential waveform of the graph (B) exceeds a threshold in response to the change (an A-line view section in the graph (A)) of motor driving currents generated by the fluctuation of supply voltage. A supply voltage waveform shown in a graph (C) is differentiated (a graph (D)), and a signal (a graph (E)) acquired by subtracting the supply-voltage differential waveform section from the differential waveform section of the driving currents of a motor 12 is input to a controller 33 by an OP amplifier 56. Accordingly, when abnormality (the holding of a foreign matter) at the time of the lifting of a door glass is detected on the basis of the differential waveform of the driving currents of the motor 12, current increase due to the fluctuation of supply voltage generated by a voltage drop, etc., at the time of the on of another load can be removed, thus preventing the unnecessary stoppage of the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window drive control device for vertically moving a door glass of a vehicle by a driving force of a motor.

[0002]

2. Description of the Related Art Generally, a manual switch and an automatic switch are provided as a power window switch on the driver's side.

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 the drive current exceeds a predetermined value, the drive of the motor is stopped.

By the way, it has been considered that when a foreign substance is present on the upward movement locus of the door glass, an abnormal current due to the foreign substance being caught is detected to stop or reverse the driving of the motor. In this case, in order to distinguish it from the current increase at the time of fully closing, there is a case where a fully closing switch for detecting that the door glass is in the vicinity of fully closing is provided.

[0005]

However, the motor drive current to be detected may exceed a predetermined value due to fluctuations in the power supply voltage other than the entrapment of foreign matter. That is, since multiple loads such as many motors and lights are connected to the same power source (battery), a voltage drop occurs especially when the load is powered on, and when the load is restored, the amount of increase in the motor drive current increases by a predetermined value. The above may be the case.

For this reason, there is a problem in that the fluctuation of the power supply voltage is mistakenly recognized as a foreign matter caught when the foreign matter is not normally caught and the motor drive is stopped or reversed.

In order to solve this problem, a value corresponding to the drop in the power supply voltage is subtracted from the drive current of the motor for correction, and when a current larger than the average value of the corrected drive current for a certain period is generated. It has been proposed to judge it as an abnormal current (see Japanese Patent Laid-Open No. 59-99979). According to this, even if a voltage drop occurs in the power supply voltage, the drive current is corrected by that amount, so that the voltage drop does not exceed the average value.

However, in the above-mentioned prior art, since it is determined whether or not the current is an abnormal current based on the average value of the drive current for a certain period, the response to the amount of change is poor. Also, if the power supply voltage fluctuates slightly, the average value may gradually change, and the abnormal current may not be detected.

In consideration of the above facts, the present invention makes it possible to accurately and accurately determine whether an abnormal current due to noise or an abnormal current due to entrapment of a foreign matter is present, and an unnecessary operation of the motor can be prevented. The aim is to obtain a drive controller.

[0010]

According to a first aspect of the present invention, there is provided a power window drive control device for vertically moving a door glass of a vehicle by a driving force of a motor, which is used when the door glass is raised by driving the motor. Motor drive current detection means for detecting a current, current change amount calculation means for calculating a change amount of the current value detected by the motor drive current detection means, power supply voltage detection means for detecting a power supply voltage of the motor, Voltage change amount calculation means for calculating a change amount of the voltage value detected by the power supply voltage detection means, and driving the motor when a value obtained by subtracting the voltage change amount from the current change amount exceeds a predetermined value. Drive control means for stopping or reversing.

[0011]

According to the first aspect of the invention, the motor drive current is detected by the motor drive current detecting means, and the detected change amount of the drive current is calculated by the current change amount calculating means.
That is, the differential value of the detected drive current is calculated.

When the differential value exceeds a predetermined value and is regarded as an abnormal current, a current value that largely changes due to fluctuations in the power supply voltage is also regarded as an abnormal current. Therefore, the invention according to claim 1 Then, the power source voltage of the motor is detected by the power source voltage detecting means, and the amount of change in the detected voltage is calculated by the voltage change amount calculating means (calculation of the differential value). By subtracting this differential value of the power supply voltage from the differential value of the drive current of the motor, it is possible to cancel the current change due to the fluctuation of the power supply voltage as noise.

Therefore, it is possible to accurately detect only the abnormal current due to the entrapment of the foreign matter. Further, since it is determined whether or not the current is an abnormal current based on the amount of change obtained by differentiating the current value, the responsiveness is good.

[0014]

1 is a circuit diagram of a power window drive controller 10 according to this embodiment.

Both ends of the motor 12 for driving the power window are respectively connected to the first and second relay circuits 14 and 16 (2).
The contacts are connected to the common terminals 14A and 16A.
The first relay circuit 14 is for raising the door glass, and the first contact 14B is grounded via a minute resistance (about 10 mΩ) 18. The second contact 14C is connected to the power supply line 20. The first relay circuit 14 is switched to the first contact 14B side when the first coil 22 is not excited, and is switched to the second contact 14C side when the first coil 22 is excited. It is designed to switch.

On the other hand, the second relay circuit 16 is for lowering the door glass, and the first contact 16B is grounded via the minute resistor 18. The second contact 16C is connected to the power supply line 20. This second relay circuit 16
Is the first contact 1 when the second coil 24 is not excited.
It is switched to the 6B side, and when the second coil 24 is excited, it is switched to the second contact 16C.

One ends of the first and second coils 22 and 24 are connected to the power supply line 20, and the other ends thereof are NP.
It is connected to the collector terminals 26C and 28C of the N-type first and second transistors 26 and 28.

Here, one end of a switch 30 for manually raising the door glass is connected between the first coil 22 and the first transistor 26, and the other end is grounded. Therefore, by turning on the manual raising switch 30, the first coil 22 is excited, the first relay circuit 14 is switched to the second contact 14C, and the motor 12 is normally rotated to raise the door glass. be able to.

Further, one end of a switch 32 for manually lowering the door glass is connected between the second coil 24 and the second transistor 28, and the other end is grounded. Therefore, by turning on the manual lowering switch 32, the second coil 24 is excited, the second relay circuit 16 is switched to the second contact 16C, and the motor 12 is reversed to lower the door glass. You can

The emitter terminals 26E and 28E of the two transistors 26 and 28 are grounded,
The base terminals 26B and 28B are input to the controller 33. The controller 33 can output a predetermined signal to each of the base terminals 26B and 28B, and the transistor 2 can be output by the output of this signal.
Currents flow from the collector terminals 26C and 28C to the emitter terminals 26E and 28E, and the reference numerals 6 and 28 can be turned on. That is, it has the same function as the functions of the manual raising and lowering switches 30 and 32.

A signal line 34 for detecting a motor current is branched from the end of the minute resistor 18 on the power supply line 20 side. The signal line 34 is connected to the non-inverting input terminal 40A of the amplifier 40 via the resistors 36 and 38. In addition, resistance 3
One end of the electrolytic capacitor 42 is connected between the resistor 6 and the resistor 38, and the other end is grounded to form a filter unit 44. The inverting input terminal 40B of the amplifier 40 is grounded via the resistor 46. Also, the amplifier 40
The output terminal 40C is connected to the inverting input terminal 40B via the feedback resistor 48, and constitutes the amplifier circuit section 50.

Further, the output terminal 40C of the amplifier 40 is
It is connected to the non-inverting input terminal 56A of the OP amplifier 56 via the capacitor 52 and the resistor 54. The non-inverting input terminal 56A is connected to the output terminal 56C via the feedback resistor 58. Since the differentiating circuit section 60 is composed of the capacitor 52 and the resistor 62, the differential waveform of the drive current of the motor 12 is input to the non-inverting input terminal 56A of the OP amplifier 56.

The reference voltage V is applied between the capacitor 52 and the resistor 54 via the resistor 62.

A differential waveform of the power supply voltage for driving the motor 12 is input to the inverting input terminal 56B of the OP amplifier 56, and its circuit is constructed as follows.

The power supply line 20 of the power supply voltage (+ B) is connected to the non-inverting input terminal 72A of the amplifier 72 via the diode 64, the Zener diode 66, and the resistors 68 and 70. A resistor 74 is connected in parallel between the resistors 68 and 70.
And one end of the capacitor 76 are connected, and the other ends thereof are grounded. The resistor 74 is for voltage division, and the capacitor 76 is for high frequency removal. The inverting input terminal 72B of the amplifier 72 is connected to the output terminal 72C, and the output signal is
The OP amplifier 56 is connected via a capacitor 78 and a resistor 80.
Of the inverting input terminal 56B. Also, the resistor 8
0 and the inverting input terminal 56B are grounded via a resistor 82. The capacitor 78 and the resistor 86 constitute a differential circuit section 84, and the differential waveform of the power supply voltage is input to the inverting input terminal 56B of the OP amplifier 56.

Further, the reference voltage V is applied between the capacitor 78 and the resistor 80 via the resistor 86, and the reference voltage V coincides with the reference of the differential waveform of the motor drive current.

From the output terminal 56C of the OP amplifier 56,
A signal obtained by subtracting the differential waveform of the power supply voltage from the differential waveform of the drive current of the motor 12 is output, and this output signal is input to the controller 33.

The controller 33 includes a CPU 88 and a RAM
90, a ROM 92, an input / output port 94, and a bus 96 such as a data bus or a controller bus connecting these.

A signal obtained by subtracting the differential waveform of the power supply voltage from the differential waveform of the drive current of the motor 12 output from the OP amplifier 56 is input via the A / D converter 98. A signal for turning on the transistors 26 and 28 is output from the input / output port 94.

Further, the input / output port 94 is supplied with an automatic signal for instructing automatic raising and lowering of the door glass. This auto signal is input from the power supply line 20 via the resistor 93 and the normally closed type auto switch 95 by the branch line 97 branching from between the resistor 93 and the auto switch 95 in the signal line grounded to ground. It has become. That is, when the auto switch 95 is in the on state (when not operated), no current flows through the branch line 97, and when the auto switch 95 is turned off (when operated), a predetermined current is input. The auto switch 95 is mechanically interlocked with the manual raising and lowering switches 30 and 32. For example, when the operation amount of the manual raising switch 30 is small, the manual raising switch 30 is turned on, and the auto switch 95 is turned on. Is turned off, and both are turned on when the operation amount is large.

In the controller 33, the auto switch 9
Once the transistor 5 is turned on, the transistors 26 and 28 are controlled so as to always output an on signal. This allows
Even if the operator releases his hand from the switch, it is possible to continue raising or lowering the door glass.

A threshold value for comparison with the differential waveform input from the OP amplifier 56 is stored in the RAM 90. The CPU 88 compares the input signal with this threshold value and determines that the input signal is large. If the door glass is opened (current more than the specified value), it is determined that the door glass is fully closed or fully opened, and the ON signal output to the transistors 26 and 28 is stopped.

Further, when a foreign substance or the like is trapped while the door glass is rising, a current exceeding the specified current flows, and the ON signal output to the first transistor 26 is stopped.

Here, in the differential waveform to be compared with the threshold value, the fluctuation of the power supply voltage has been removed, and other equipment (headlight, air conditioner, etc.) connected to the same power supply voltage.
This prevents erroneous detection such as detection of an abnormal current (specified abnormal current) due to a voltage change such as a voltage drop that occurs when the power is turned on.

The operation of this embodiment will be described below. First,
When manually raising the door glass, by operating the manual raising switch 30 with a small operation amount, the first
The coil 22 of is excited and the first relay circuit 14 becomes the second
It switches to the contact point 14C. At this time, since the second relay circuit 16 is switched to the first contact 16B side, the motor 12 rotates normally. This raises the door glass. When the operation of the manual raising switch 30 is stopped at the desired position, the driving of the motor 12 is stopped and the raising of the door glass is stopped.

On the other hand, when lowering the door glass,
By operating the manual lowering switch 32, the second coil is excited to cause the second relay circuit 16 to move to the second contact 1
Since it is switched to the 6C side, the motor 12 is reversed and the door glass is lowered.

Next, when the manual raising switch 30 is operated with a large operation amount, the automatic switch 95 is turned on together with the manual raising switch 30. The processing procedure when the auto switch 95 is turned on will be described below with reference to the flowchart of FIG.

When it is confirmed in step 100 that the auto switch 95 is turned on, the routine proceeds to step 102, where it is determined whether the door glass is moving up or down, and in step 104,
The transistor 26 or 28 corresponding to this discriminated side
Output a turn-on signal to. As a result, even if the hand is lifted from the manual raising switch 30 or the manual lowering switch 32, the excitation of the corresponding first or second coil 22 or 24 is continued, and the movement of the door glass can be continued.

In the next step 105, it is judged whether or not it is during the blanking period. This is because the threshold value may be exceeded due to the inrush current at the initial stage of switch-on, resulting in erroneous detection. Therefore, no comparison is made for a certain period from the initial stage of switch-on. If it is determined in step 105 that the blanking period has passed, the process proceeds to step 106 to capture the differential waveform of the drive current of the motor 12, and then in step 108, the threshold value previously stored in the RAM 90 is read. In the next step 110, it is determined whether or not the captured differential waveform exceeds a threshold value, and in the case of a negative determination, the output of the ON signal is continued as it is, and the process proceeds to step 106 to capture the next differential waveform. Then, steps 106, 108 and 110 are repeated. Here, if it is determined in step 110 that the threshold value has been exceeded, it is determined that the current has increased due to the load on the motor 12 due to the door glass being fully closed and hitting the door frame or the like, and the process proceeds to step 112. The output of the ON signal is stopped, and the process returns to step 100.

Further, even if a foreign object is trapped while the door glass is rising, the current increases, so that the threshold value is exceeded and the output of the ON signal is stopped. Thus, even if a foreign matter or the like is caught while the door glass is rising, it is possible to prevent the foreign matter and the door glass from being damaged.

Here, in this embodiment, the differential waveform of the drive current of the motor 12 is not directly fetched, but the motor 12 is driven.
The differential waveform of the drive current is subtracted from the differential waveform of the power supply voltage to be input.

That is, the current waveform input to the non-inverting input terminal 40A of the amplifier 40 of FIG. 1 is as shown in FIG. 3A, and when this is differentiated by the differentiating circuit section 60, It becomes like 3 (B). Here, the differential waveform of FIG. 3 (B) exceeds the threshold value according to the change of the motor drive current (the portion indicated by the arrow A in FIG. 3 (A)) caused by the fluctuation of the power supply voltage. However, the cause of exceeding the threshold value is not the entrapment of foreign matter or the full closure but the fluctuation of the power supply voltage. Therefore, if the output of the ON signal is stopped in this state, unnecessary operation will be performed.

Therefore, the power supply voltage waveform shown in FIG. 3C is differentiated (see FIG. 3D), and this power supply voltage differential waveform component is subtracted from the drive current differential waveform component of the motor 12 by the OP amplifier 56. Input signal (see FIG. 3E) to the controller 33.

As described above, in the present embodiment, when an abnormality (entrapment of foreign matter) when the door glass is raised is detected based on the differential waveform of the drive current of the motor 12, the differential waveform of the drive current is used to detect the abnormality of the power supply voltage Since the variation is subtracted and detected, it is possible to eliminate the current rise due to the fluctuation of the power supply voltage caused by the voltage drop when other loads are turned on, and the motor is not stopped unnecessarily. .

In this embodiment, the driving of the motor 12 is stopped by pinching foreign matter or the like, but it may be reversed (reverse rotation) for a predetermined time. In this case, it is necessary to provide a fully closed sensor in order to distinguish it from the current increase in the fully closed state.

[0046]

As described above, the power window drive control device according to the present invention can accurately and accurately determine whether an abnormal current due to noise or an abnormal current due to entrapment of a foreign object, and unnecessary operation of the motor. It has an excellent effect of being able to prevent.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a power window drive control device according to an embodiment.

FIG. 2 is a control flowchart.

FIG. 3 is a specific diagram showing a waveform of each part of the power window drive control device.

[Explanation of symbols]

 10 Power Window Drive Controller 12 Motor 33 Controller 60 Differentiation Circuit Section (Motor Driving Current) 84 Differentiation Circuit Section (Power Supply Voltage) 95 Auto Switch

Claims (1)

[Claims] 1. A power window drive control device for vertically moving a door glass of a vehicle by a driving force of a motor, the motor drive current detecting means for detecting a current when the door glass is raised by driving the motor, and the motor. Current change amount calculation means for calculating the amount of change in the current value detected by the drive current detection means, power supply voltage detection means for detecting the power supply voltage of the motor, and change in the voltage value detected by the power supply voltage detection means. A power window having a voltage change amount calculation means for calculating the amount and a drive control means for stopping or reversing the drive of the motor when the value obtained by subtracting the voltage change amount from the current change amount exceeds a predetermined value. Drive controller.