JP2001220948A - Catching detector for window glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catching detector for window glass preventing error detection of catching and preventing application of a high load to a caught object. SOLUTION: The catching detector 11 is provided with a window switch 12, a microcomputer 13, a driving circuit 14, and a motor 15. The microcomputer 13 outputs a signal for opening/closing the window glass to the driving circuit 14 on the basis of an input signal from the window switch 12. The microcomputer 13 computes a rotational speed of the motor 15 on the basis of an output signal from an encoder 15a. A first threshold value and a second threshold value are stored inside the microcomputer 13. The respective threshold values are speed reduction amounts (speed reduction rate) per a unit time of the motor 15 and set to be different values respectively. The microcomputer 13 detects whether catching of the window glass is caused or not on the basis of these threshold values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the presence or absence of a window glass of a vehicle, and more particularly, to a window for releasing the object from the state of being held when the object is held during the closing operation of the window glass. The present invention relates to a device for detecting the presence or absence of holding of glass.

[0002]

2. Description of the Related Art Generally, in a power window device of an automobile, a window glass is opened and closed by operating a window opening / closing switch. Specifically, for example, when the window is closed while the window is open, power is supplied to a motor that moves the window glass up and down,
The motor rotates in a direction to close the glass. Then, when the glass is completely closed, the power supply to the motor is stopped, and the closing operation of the glass ends. This power supply is stopped, for example, based on a load current to the motor. That is, when the glass is fully closed, the load on the motor is large. When the load current exceeds a predetermined value, it is determined that the glass is closed, and the power supply is stopped. ing.

[0003] In addition, there is a power window device of this type having a pinch prevention mechanism. This pinch prevention mechanism stops the closing operation when an object is caught in the glass during the closing operation of the window glass, and then operates the opening direction of the glass to release the object. .

Detection of pinching of the object (detection of pinching)
Is performed based on the rotation speed of the motor that opens and closes the window glass. Specifically, when an object is caught in the glass, the rotation speed of the motor is reduced, so that when the rotation speed of the motor reaches a predetermined deceleration rate, it is determined that an object is caught in the glass, and the glass is opened. Was like that.

[0005]

However, the rotational speed of the motor also changes due to the impact of opening and closing the door and the impact (vibration) generated when traveling on a rough road. For this reason, if the deceleration rate of the rotation speed of the motor, which is the threshold value, is set to a low value, erroneous detection may occur such that even if nothing is caught in the window glass, it is determined that the window glass is caught. . Therefore, in order to prevent such erroneous detection, conventionally, it has been necessary to set a deceleration rate, which is a threshold value for detecting the presence or absence of the pinch, higher than a deceleration rate that can be caused by vibration, impact, or the like.

However, if the deceleration rate, which is the threshold value for detecting the presence / absence of the pinch, is set to a high value, for example, when an object having a low spring rate, that is, a soft object is pinched, the object is not pinched unless the object is considerably pinched. Not detectable. Further, the motor tends to rotate by inertial force even after the rotation is stopped. Therefore, when an object having a high spring rate, that is, a hard object, is sandwiched, the deceleration rate of the rotation speed sharply increases. For this reason, even if the pinch by the window glass is detected, a high load may be applied to the object before the window glass starts to open.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a high load from being applied to a sandwiched object while preventing erroneous detection of the presence or absence of a sandwiched window glass. A detection device is provided.

[0008]

According to the first aspect of the present invention, there is provided a window switch for opening / closing a window glass, a motor for opening / closing the window glass, and a motor. A drive circuit that drives the motor forward and reverse, and a drive control that has a function to prevent the pinch from being driven when the pinch is caused by the window glass, while driving the motor according to an operation signal from a switch. Means for detecting presence or absence of pinching of a window glass, wherein the drive control means stops driving the motor when a deceleration rate of a rotation speed of the motor exceeds a first threshold value set in advance. At the same time, the deceleration rate of the motor immediately after that is further monitored, and the deceleration rate is set to a predetermined second speed.
When the threshold value is exceeded, it is determined that the pinch by the window glass has occurred and the motor is reversed.

According to a second aspect of the present invention, in the window glass sandwiching detection device according to the first aspect, the second threshold value is set to be higher than the first threshold value. The point is that

According to a third aspect of the present invention, in the window glass sandwiching detection device according to the first or second aspect, the drive circuit sends the signal to the motor based on an output signal from the drive control means. A non-contact type switching element that supplies power to the motor is provided, and the drive control means stops driving the motor by stopping power supply to the motor by the switching element.

Hereinafter, the "action" of the present invention will be described. According to the first aspect of the present invention, when the deceleration rate of the rotation speed of the motor exceeds the first threshold value, the driving of the motor is temporarily stopped, and the deceleration rate of the motor immediately after that is the second threshold value. When the value is exceeded, it is determined that pinching by the window glass has occurred. For this reason, even if the deceleration rate of the motor exceeds the first threshold value due to the opening / closing impact of the door or the impact (vibration) generated when traveling on a rough road, it is not determined that the motor is caught by the deceleration rate. Therefore,
Even when the first threshold value is set lower, it is possible to prevent erroneous detection of the presence / absence of pinching. Moreover, since the presence / absence of holding is detected based on the deceleration rate after the driving of the motor is stopped, it is possible to prevent a sudden load from being applied to the held object.

According to the second aspect of the present invention, the second threshold value is set higher than the first threshold value. Therefore, even if the deceleration rate of the motor exceeds the first threshold value due to an opening / closing impact of a door or an impact (vibration) generated when traveling on a rough road, the deceleration rate is increased to the second threshold value. Can be reliably prevented from being exceeded. Therefore, erroneous detection of the presence / absence of pinching can be reliably prevented.

According to the third aspect of the present invention, the drive of the motor is stopped by stopping the power supply to the motor by the non-contact type switching element. Thus, the motor rotates for a very short time due to the inertia force without stopping suddenly after the driving is stopped. For this reason, the deceleration rate immediately after the stop of the driving of the motor can be reliably monitored by using the minute time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a window glass sandwiching detection device according to the present invention will be described below in detail with reference to FIGS.

As shown in FIG.
Includes a window switch 12, a microcomputer (microcomputer) 13 as drive control means, a drive circuit 14, and a motor 15.

The window switch 12 is a switch for opening and closing a window glass (not shown), and is connected to an input terminal IN of the microcomputer 13. That is, an operation signal of the switch 12 is input to the microcomputer 13.

The motor 15 is a DC motor for opening and closing the window glass. This motor 15 has
An encoder 15a is built in. The encoder 15a is connected to the input terminal Fs of the microcomputer 13. That is, the output signal of the encoder 15a is input to the microcomputer 13.

The microcomputer 13 is a CPU unit including a memory such as a ROM and a RAM. The microcomputer 13 outputs a signal for opening and closing the window glass to the drive circuit 14 based on the input signal from the window switch 12.

In the microcomputer 13, the encoder 1
The rotation speed of the motor 15 is calculated based on the output signal from 5a. The microcomputer 13 stores a first threshold value and a second threshold value. These threshold values are the amount of decrease in the speed of the motor 15 per unit time (deceleration rate), and are set to different values. The microcomputer 13 performs an operation of detecting the presence / absence of pinching of the window glass based on the threshold values.

The drive circuit 14 includes two NPN transistors TR1 and TR2 and two two-contact relays RL1 and R2.
L2 and an N-channel power MOS transistor TR3 as a contactless switching element.

The base terminal of the transistor TR1 is connected to the output terminal OUT1 of the microcomputer 13, and the transistor T1
The base terminal of R2 is connected to the output terminal OUT2 of the microcomputer 13. In addition, each transistor TR1, TR2
Are both grounded. The collector terminal of the transistor TR1 is connected to the coil L1 of the relay RL1.
Is connected to one end. And the transistor TR2
Is connected to one end of the coil L2 of the relay RL2. The other ends of the coils L1 and L2 are both connected to a positive terminal B of the battery.

The movable contact CP3 of the relay RL1 is connected to the motor 1
5, and the fixed contact CP2 is grounded. The fixed contact CP1 of the relay RL1 is connected to the source terminal of the MOS transistor TR3. And
The movable contact CP3 is connected to the fixed contact CP2 when the coil L1 of the relay RL1 is demagnetized, and is connected to the fixed contact CP1 when the coil L1 is excited.

The movable contact CP6 of the relay RL2 is connected to the other end of the motor 15, and the fixed contact CP5 is grounded. The fixed contact CP4 of the relay RL2 is connected to the source terminal of the MOS transistor TR3. The movable contact CP6 is connected to the fixed contact CP5 when the coil L2 of the relay RL2 is demagnetized, and is connected to the fixed contact CP4 when the coil L2 is excited.

The gate terminal of the MOS transistor TR3 is connected to the output terminal Cs of the microcomputer 13. The drain terminal of the MOS transistor TR3 is connected to the plus terminal B of the battery.

Here, the opening / closing operation of the window glass in the sandwiching presence / absence detecting device 11 configured as described above will be described. When an operation for opening the window glass is performed by the window switch 12, an H level signal is output from the output terminals OUT1 and Cs of the microcomputer 13. Also, an L-level signal is output from the output terminal OUT2. That is, the transistor TR1 and the MOS transistor TR3 are driven.
Therefore, the coil L1 of the relay RL1 is excited, and the movable contact CP3 and the fixed contact CP1 are connected. Therefore,
A current flows in a direction indicated by an arrow i1 in FIG. 1, and the motor 15 is driven. Then, the window glass is opened by the driving of the motor 15.

When an operation for closing the window glass is performed by the window switch 12, an H level signal is output from the output terminals OUT2 and Cs of the microcomputer 13. The output terminal OUT1
Outputs an L-level signal. That is, the transistor TR2 and the MOS transistor TR3 are driven (O
N). Therefore, the coil L2 of the relay RL2 is excited, and the movable contact CP6 and the fixed contact CP4 are connected. Therefore, a current flows in a direction indicated by an arrow i2 in FIG.
The motor 15 is driven in the reverse rotation direction. The window glass is closed by driving the motor 15 in the reverse rotation direction.

By the way, during the closing operation of the window glass, the microcomputer 13 performs an operation for detecting the presence / absence of pinching. The operation for detecting the presence or absence of the pinch will now be described.
When any load is applied to the window glass,
The rotation speed of the motor 15 is reduced by the load. For this reason, as shown in FIG. 2, when the rotation speed of the motor 15 decreases by Δv0 or more during a predetermined time Δt0 from the time when the rotation speed of the motor 15 starts to decrease, the microcomputer 1
3 stops the driving of the motor 15. That is, in this case, the microcomputer 13 determines that there is a suspicion that the object is pinched by the window glass, and stops driving the motor 15. Therefore, the deceleration rate D1 of the motor 15 at this time is
(D1 = Δv0 / Δt0) is set as the first threshold value. The microcomputer 13 outputs an L-level signal from the output terminal Cs and outputs the signal to the MOS transistor TR3.
Is turned off, the driving of the motor 15 is stopped.

Subsequently, the microcomputer 13 monitors the rotation speed of the motor 15 after the drive is stopped for a predetermined time Δt. More specifically, since the motor 15 continues to rotate for a short time due to the inertial force, the microcomputer 13 monitors the rotation speed for a predetermined time Δt of the short time. And this time Δ
When the speed change amount of the motor 15 at t exceeds Δv1, the microcomputer 13 determines that the object is pinched by the window glass and drives (opens) the motor 15 in the reverse rotation direction. That is, when the object is held between the window glasses, the rotation speed of the motor 15 sharply decreases. Therefore, it is detected that the window glass has been held by this sharp decrease in speed. Therefore,
At this time, the deceleration rate D2 of the motor 15 (D2 = Δv1 / Δ
t) is set as the second threshold value. The second threshold value D2 is set higher than the first threshold value D1.

The motor 1 for the predetermined time Δt
5 is smaller than the change amount Δv1,
The microcomputer 13 determines that the object is not sandwiched by the window glass, and drives the motor 15 again.
At this time, the microcomputer 13 sets the MOS transistor TR
By turning on 3, the motor 15 is driven again (close operation). Specifically, the characteristic curve of the rotation speed of the motor 15 when no load is applied to the window glass is as shown by a two-dot chain line in FIG.
Is smaller than the speed change Δv1. Therefore, in this case, it is determined that the decrease in the rotation speed of the motor 15 is caused by force majeure such as a door opening / closing impact or an impact (vibration) generated when traveling on a rough road. As a result, the motor 15 is driven again, and the window glass resumes the closing operation at the normal speed as shown by the two-dot chain line in FIG. The characteristic curve indicated by the two-dot chain line in FIG. 2 is calculated from the weight, sliding resistance, speed, and the like of the window glass.

Therefore, according to the present embodiment, the following effects can be obtained. (1) The deceleration rate of the rotation speed of the motor 15 is the first deceleration rate D
When it exceeds 1, the driving of the motor 15 is temporarily stopped. When the deceleration rate of the motor 15 immediately after that exceeds the second deceleration rate D2, it is determined that an object is caught in the window glass, and the motor 15 is driven in the reverse rotation direction. . That is, the window glass is opened.

When the deceleration rate after stopping the driving of the motor 15 does not exceed the second deceleration rate D2, the motor 15 is driven again to close the window glass again. For this reason, even if the deceleration rate of the motor 15 exceeds the first deceleration rate D1 due to the opening / closing impact of the door or the impact (vibration) generated when traveling on a rough road, it is not determined that the motor 15 has been pinched. . Therefore, the first deceleration rate D1
Is set low, it is possible to prevent erroneous detection of pinching. Moreover, since the presence / absence detection is performed based on the deceleration rate after the drive of the motor 15 is stopped, it is possible to prevent a sudden load from being applied to the held object.

(2) The second deceleration rate D2 is set higher than the first deceleration rate D1. For this reason, even if the deceleration rate of the motor exceeds the first deceleration rate D1 due to the opening / closing impact of the door or the impact (vibration) generated when traveling on a rough road,
It is possible to reliably prevent the deceleration rate from exceeding the second deceleration rate D2. Therefore, erroneous detection of the presence / absence of pinching can be reliably prevented.

(3) When the deceleration rate of the rotation speed of the motor 15 exceeds the first deceleration rate D1, the driving of the motor 15 is stopped by turning off the MOS transistor TR3. For this reason, after the drive is stopped,
It rotates for a very short time due to inertial force without stopping suddenly.
Therefore, the deceleration rate immediately after the stop of the driving of the motor 15 can be reliably monitored by using the minute time.

(4) When the deceleration rate of the rotation speed of the motor 15 exceeds the first deceleration rate D1, the drive of the motor 15 is stopped by turning off the MOS transistor TR3. That is, the drive of the motor 15 is not stopped by the ON / OFF operation of the relay. For this reason, when the driving of the motor 15 is stopped in the pinch detection operation, the switching sound of the relay contact does not occur. Therefore, the detection operation can be performed quietly.

The embodiment of the present invention may be modified as follows. In the above embodiment, the power MOS transistor TR3 is used as a switching element for supplying power to the motor 15.
Is used. However, instead of this, another non-contact type switching element such as a transistor or an IGBT (Insulated Gate Bipolar Transistor) may be used.

The power MOS transistor TR
3 may be omitted, and the driving of the motor 15 may be stopped by the ON / OFF operation of each of the relays RL1 and RL2. In the above embodiment, when the deceleration rate of the rotation speed of the motor 15 exceeds the first deceleration rate D1, the driving of the motor 15 is stopped. But instead,
When the rotation speed of the motor 15 falls below a predetermined speed, the driving of the motor 15 may be stopped.

Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments will be listed below. (1) In any one of claims 1 to 3, the non-contact switching element is a power MOS transistor.

(2) A window switch for opening and closing the window glass, a motor for opening and closing the window glass, a drive circuit for driving the motor to rotate forward and reverse, and driving the motor according to an operation signal from the switch. And a drive control means having a function of preventing the motor from being driven when the motor is caught by the window glass, wherein the drive control means comprises: When the rotation speed of the motor falls below a predetermined speed, the driving of the motor is stopped, and the deceleration rate of the motor immediately after that is further monitored. When it exceeds, it is determined that pinching by the window glass has occurred, and the motor is turned on. To rotate the window glass in the opening direction.

[0039]

As described in detail above, according to the first aspect of the present invention, it is possible to prevent a high load from being applied to the sandwiched object while preventing erroneous detection of the presence or absence of the sandwiching.

According to the second aspect of the present invention, erroneous detection of the presence or absence of pinching can be reliably prevented. According to the third aspect of the invention, it is possible to reliably monitor the deceleration rate immediately after the motor stops driving.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing an embodiment of a window glass sandwiching detection device according to the present invention.

FIG. 2 is a graph showing characteristics of the embodiment.

FIG. 3 is a graph showing characteristics of the embodiment.

[Explanation of symbols]

11: pinch detection device, 12: window switch,
Reference numeral 13 denotes a microcomputer as a drive control means, 14 a drive circuit, 15 a motor, 15a an encoder, TR3 an n-channel power MOS transistor as a contactless switching element.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2E052 AA09 BA02 CA06 EB01 GA10 GB06 GB15 GC06 GD03 GD09 HA01 KA12 KA13 LA08 3D127 AA02 AA07 BB01 CB05 DF04 DF35 DF36 FF01 FF06 FF08 FF20 5H001 AB05 AD10 AC01 AC01 AC05 CD40 CF01 CF11 DD13 DD19

Claims (3)

[Claims] 1. A window switch for opening and closing a window glass, a motor for opening and closing the window glass, a driving circuit for driving the motor to rotate forward and reverse, and driving the motor in accordance with an operation signal from the switch. And a drive control unit having a pinch prevention function of stopping driving of the motor when the pinch by the window glass occurs. When the rotation speed deceleration rate exceeds a preset first threshold value, the driving of the motor is stopped, and the deceleration rate of the motor immediately thereafter is further monitored, and the deceleration rate is set in advance. When the second threshold value is exceeded, it is determined that pinching by the window glass has occurred, and Clamping presence detection device of the window glass, characterized in that reversing operation the data. 2. The apparatus according to claim 1, wherein the second threshold value is set higher than the first threshold value. 3. The drive circuit includes a non-contact type switching element that supplies power to the motor based on an output signal from the drive control means, and the drive control means controls the motor by the switching element to the motor. 3. The apparatus according to claim 1, wherein the drive of the motor is stopped by stopping power supply.