JPH0797883A - Power winding device - Google Patents

Abstract

PURPOSE:To reduce the accumulative error to zero and correctly measure the position of a window by adding the motor revolution pulse corresponding to the reverse electromotive voltage to the motor pulse count value in the case when the applied voltage to a motor is turned OFF. CONSTITUTION:When a window is to be lowered, a motor 3 is driven in the direction of the lowering of the window by a manually operated down-switch 7. When the motor 3 starts revolution, pulse signals are sent into a microcomputer 1 from a pulse generator 5. The pulse signals are integration-calculated, and the position of the window is calculated from the integration calculation value. Then, the drive of the motor 3 is suspended by turning OFF the manually operated down-switch 7. If the motor 3 inertia-revolves even after the stop of the motor 3, the reverse electromotive voltage is measured by a reverse electromotive voltage detector 4. The pulse quantity corresponding to the reverse electromotive voltage is added to the/integration calculation value on the stop of the motor 3. By this additional value, the error due to the inertia-revolution of the motor 3 is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a power window device with a pinching prevention function capable of preventing a part of a human body from being pinched.

[0002]

2. Description of the Related Art Conventionally, as a power window device, there is one that automatically elevates and lowers a window by a motor that rotates forward and backward in response to the operation of a manually operated switch. In such a power window device, a manually operated switch is used. Since the motor continues to rotate while the engine is turned on, the wind continues to rise, which causes a problem that a part of the human body such as the passenger's head and hands is caught between the window frame and the window.

In recent years, in order to avoid such a danger, a power window device with a trapping prevention function using a sensor for measuring the window position has been proposed. However, a power window device using a sensor is difficult to put into practical use because of problems in mounting the sensor, restrictions in manufacturing doors including window frames and windows, and accompanying large cost increase, or reliability problems. Japanese Patent Publication No. 5-12464 provides a power window device which is highly reliable without using a sensor, can detect a pinch of an object reliably, and can be easily put into practical use.

According to the above power window device, the current ripple of the motor is pulse-shaped and taken in as a motor pulse signal, and when the motor operation command is released and the motor is stopped, the voltage applied to the motor disappears, and The wind position detection accuracy is improved by correcting the motor pulse counter with the correction value searched for by the correction data map created in advance for the inertia amount that is not counted until the rotation due to the inertia of the motor rotation unit stops. By monitoring the motor pulse count value, that is, the position of the window, and the motor speed fluctuation rate, that is, the fluctuation of the window moving speed, it is possible to reliably detect the trapping of an object without using a special sensor.

[0005]

However, according to the above-mentioned method, the correction value of the motor pulse counter corresponding to the inertial rotation amount of the motor is experimentally determined by using the motor speed and the motor speed fluctuation rate as parameters in the range of possible use conditions. Since it is created by obtaining it, there is a problem that the window position cannot be accurately measured in that the actual motor inertial rotation amount is not obtained.

The present invention has been made to solve the above problems, and paying attention to the fact that the back electromotive force of the motor is proportional to the motor rotation speed and the applied voltage, the motor pulse when the applied voltage to the motor is OFF. An object of the present invention is to provide a power window device capable of accurately measuring a window position by adding a motor rotation pulse corresponding to a counter electromotive voltage to a count value.

[0007]

The present invention is, as a concrete means for solving the above-mentioned problems, in a power window device driven by a motor, the current ripple of the motor when the motor is energized is waveform-shaped to rotate the motor. A pulse generator for generating a pulse, a counter electromotive voltage detector for detecting a counter electromotive voltage of the motor when the motor is deenergized, a pulse counter integrating means for taking in a motor rotation pulse of the pulse generator and integrating a pulse counter, Comprising correction count obtaining means for obtaining a correction count value corresponding to the back electromotive force of the counter electromotive voltage detector, and window position detecting means for adding the correction count value to the integrated pulse counter to detect the window position. A featured power window device is provided.

[0008]

According to the power window device having the above-described structure, when the motor is energized, the pulse generator shapes the current ripple of the motor into a motor rotation pulse, and when the motor is deenergized, the back electromotive force detector detects the motor Detect back electromotive force. Then, the pulse counter integrating means takes in the motor rotation pulse of the pulse generator and integrates the pulse counter, and the correction counter obtaining means obtains the corrected count value corresponding to the counter electromotive voltage of the counter electromotive voltage detector, and the window position The detection means adds the correction count value to the integrated pulse counter to detect the window position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing the overall configuration of the power window device according to the present embodiment. The microcomputer 1 controls the elevation of the window by signals from the manual up, manual down, automatic up, and automatic down switches 6 to 9, the back electromotive force detector 4, and the pulse generator 5, and also performs position calculation and the like. To do. The driver 2 applies a drive pulse to the motor 3 to drive the motor 3. The motor 3 is the driver 2
It is a motor for forward and reverse rotation that is driven by the motor to raise and lower the window. The counter electromotive voltage detector 4 detects the counter electromotive voltage due to inertial rotation when the motor 3 is stopped. The back electromotive voltage is a back electromotive voltage generated in the armature coil by inertial rotation of the armature in the remanent magnetism of the field. The rotation speed detector 5 shapes a pulse waveform of the motor current ripple to generate a pulse signal according to the rotation speed of the motor. Switches 6-9 select whether the window is manually moved up or down.

Next, a method for detecting the window position of the present embodiment having the above-mentioned structure will be described. When the manual down switch 7 is pushed down, the microcomputer 1 receives the signal from the manual down switch 7 and
Is driven to rotate the motor 3 in the downward direction of the window. When the motor 3 starts rotating, the pulse generator 5 sends a pulse signal according to the number of rotations of the motor 3 to the microcomputer 1. The microcomputer 1 counts and integrates the pulse signals and calculates the position of the window by the integrated value. When the manual down switch 7 is turned off, the microcomputer 1 sends a stop signal to the driver 2
Then, the energization drive of the feed motor 3 is stopped.

When the energization drive of the motor 3 is stopped and the motor 3 is inertially rotating by inertia, the pulse generator 5 does not generate a pulse signal. Therefore, when the motor 3 is inertially rotating by inertia, the counter electromotive voltage detector 4 measures the counter electromotive voltage, and the pulse number corresponding to this is measured at the time when the driver 2 stops driving the motor 3. The position of the window can be accurately measured by adding to. The same method is used to measure when the window is rising. As shown in FIG. 2, the counter electromotive voltage during inertial rotation decreases with time, but the characteristics such as sliding resistance differ depending on the model of the motor used, and there is a difference in the time until complete stop. Therefore, the number of revolutions corresponding to the back electromotive force of the motor is calculated by checking the correlation in advance through experiments or the like, storing it in the ROM of the microcomputer 1 as a data table, and retrieving it when measuring the back electromotive force.

Next, the operation of the window position detecting process of the present embodiment having the above-mentioned structure will be described with reference to the flow chart shown in FIG. This flowchart shows the window position detection process P10 when the manual up switch 6 is ON.
Although 0 is shown, the process is the same in other cases. In step S110, after starting the apparatus, the manual up switch 6
ON and OFF are confirmed, and if it is OFF, step S
At 210, the process ends. If the manual up switch 6 is ON in step S110, step S1
At 20, an ascending instruction for rotating the motor 3 in the ascending direction of the window is issued. Then, when the motor rotation pulse signal is input from the pulse generator 5 in step S130, the pulse counter P _C is incremented by 1 in step S140.

If the manual up switch 6 remains ON in step 150, step S120
Then, the process is executed again from step S120.
If the manual up switch 6 is off in step 150, the energization drive of the motor 3 by the driver 2 is stopped in step S160. Then, in step S170, the counter electromotive voltage V _R is measured. Then, in step S180, the correction count value P _R corresponding to the counter electromotive voltage V _R is retrieved and calculated from the data table stored in the ROM, and the correction count value P _R is calculated in step S190 in the pulse counter P _C. Is added to the motor 3
It becomes the count value including the inertial rotation of.

As described above, the power window device of the present embodiment can detect the motor rotation pulse by the motor current ripple which is an inexpensive detection method, and the counter value of the count value of the motor rotation pulse is converted into the counter electromotive voltage. By adding the correction count value of the corresponding rotation pulse, it is possible to calculate the window position with high accuracy. Further, since the counter electromotive voltage is proportional to the power supply voltage and the temperature, it is automatically corrected for the power supply voltage and the temperature without adding a new sensor.

The power window device of the present invention has the above-mentioned configuration, and by adding the motor rotation pulse corresponding to the back electromotive force to the motor pulse count value when the voltage applied to the motor is OFF, the window position is determined. It has an excellent effect that it can be measured accurately.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of a power window device according to an embodiment.

FIG. 2 is a relationship diagram showing a counter electromotive voltage after the motor is turned off.

FIG. 3 is a flowchart showing a window position detection process of this embodiment.

[Explanation of symbols]

1 ... microcomputer, 2 ... driver,
3 ... Motor, 4 ... Counter electromotive voltage detector, 5 ... Pulse generator, 6-9 ... Manual up, Manual down, Automatic up, Automatic down switch, S110-S190 ... Step .

Claims (1)

[Claims] 1. In a power window device driven by a motor, a pulse generator for shaping a current ripple of the motor when the motor is energized to form a motor rotation pulse, and a counter electromotive voltage of the motor when the motor is deenergized. A counter electromotive voltage detector for detecting, a pulse counter integrating means for taking in a motor rotation pulse of a pulse generator and integrating a pulse counter, and a correction count for obtaining a correction count value corresponding to the counter electromotive voltage of the counter electromotive voltage detector. A power window device comprising: a unit; and a window position detecting unit that detects a window position by adding a correction count value to the integrated pulse counter.