JPH1018702A - Power window control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an external noise superposed on a pulse signal outputted from a pulse generator for the prevention of the measurement error of pulse width, and always keep window position data stored in a central processing circuit identical to a real window position, even when a system is in a sleeping state. SOLUTION: This control device has a central processing circuit 3A for detecting the open/close positions of a window, and the catch of a foreign material with the window from pulse signals outputted from a pulse generator 2 jointed to a power window motor 1. The central processing circuit 3A has a function of detecting pulse signals from the pulse generator 2 while referring to ripple signals from a waveform shaping circuit 3G. Also, a power circuit 3D is always kept connected to the pulse generator 2, so as to keep the operable state thereof at all times, regardless of the operation state of the power window motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window control device for opening and closing a vehicle window using a power window motor, and more particularly to a window opening / closing position based on a pulse signal output from a pulse generator connected to the power window motor. The present invention also relates to a power window control device provided with a central processing circuit for detecting foreign matter being caught by a window.

[0002]

2. Description of the Related Art As a prior art of this kind, for example, Japanese Patent Application Laid-Open No. Hei 7-212963 discloses a technique in which a position is determined by a rising (or falling) edge of a pulse signal output from a pulse generator connected to a shaft of a power window motor. And the pulse width measurement is started at the same time as counting, the pulse width measurement is terminated at the falling (or rising) edge, and the pulse width measurement value is used as speed data.

[0003]

However, in this type of conventional power window control device, when a pulse signal output from a pulse generator is loaded with external noise, the edge of the external noise is distinguished from the edge of the pulse signal. It is difficult and there is a problem that a pulse width measurement error occurs. In addition, there is a problem that when an external force is applied during the system sleep state, the window position is displaced, and a large error occurs between the window position data stored in the central processing circuit and the actual window position. Was.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and eliminates the influence of external noise even when the pulse signal output by the pulse generator is loaded with external noise, thereby preventing a pulse width measurement error. . In addition, even in the system sleep state, a pulse signal is always input from the pulse generator to update the window position data stored in the central processing circuit,
It is an object of the present invention to provide a power window control device capable of ensuring that window position data always matches the actual window position.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 is based on a first aspect of the present invention, wherein a window signal is output from a pulse generator connected to a power window motor. In a power window control device including a central processing circuit that detects entrapment, and a waveform shaping circuit that processes brush noise generated by the power window motor and outputs the ripple signal as a ripple signal, a pulse signal output by the pulse generator is output. And a power window control device provided with the central processing circuit having a function of detecting with reference to a ripple signal output from the waveform shaping circuit.

The invention according to claim 2 has a function of executing edge detection of a pulse signal output by a pulse generator every time a counter value of a ripple signal output by the waveform shaping circuit reaches a predetermined value. A power window control circuit provided in the central processing circuit is provided.

Further, the invention according to claim 3 provides a power window control device in which a power supply circuit is constantly connected to the pulse generator so that the pulse generator is always operated regardless of the operation state of the power window motor. I do.

[0008]

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an electric circuit diagram showing this embodiment. Reference numeral 1 denotes a power window motor for electrically closing and opening a window of a vehicle, which is mounted inside a door or the like. Reference numeral 2 denotes a pulse generator that outputs a pulse signal corresponding to the circuit of the power window motor 1, and is mounted on, for example, an output gear of the power window motor 1.

Reference numeral 3 denotes a controller. The controller 3 is a unit mounted on, for example, an armrest of a vehicle, and includes a central processing circuit 3A, a power window operation switch 3B, a drive voltage adjustment circuit 3C, a constant voltage circuit 3D,
Voltage detection circuit 3E, current detection circuit 3F, waveform shaping circuit 3
G, sensor interface 3H, motor drive circuit 3I,
Current detection resistor 3J and switch interface 3K
The connection is configured by: Each of these components will be described in detail below.

First, the central processing circuit 3A is a portion composed of a microcomputer, and the functions shown in the flowcharts of FIGS. 2 to 4 are stored in the ROM.

For example, the flowchart of FIG. 2 comprising steps 100 to 116, in particular steps 108 to 112, is as follows:
This shows a function of the central processing circuit 3A such that a pinch detection function is released for a first time T1 by a specific operation of the power window operation switch 3B. Specifically, in step 108, the DOWN SW 3B3 of the power window operation switch 3B or the AUT
O DOWN SW3B4 was turned ON (YE
When S) is determined, the process proceeds to step 109. Step 1
09, the opening / closing position of the window is at the lower end position (YE
When S) is determined, the process proceeds to step 110. Step 1
In step 10, the motor DOWN output is turned off and step 1
Proceed to 11. In step 111, the second time T2 = 2
If it is determined that [SEC] has elapsed (YES), the flow proceeds to step 112. In step 112, the entrapment detection function is released for the first time T1 = 60 [SEC].

That is, even after the opening / closing position of the window reaches the lower end position, the occupant of the vehicle can operate the power window operation switch 3B.
DOWN SW3B3 or AUTO DOWN
If the SW3B4 is continuously operated for more than the second time T2 = 2 [SEC], the entrapment detection function is released for the first time T1 = 60 [SEC]. Therefore,
The sliding resistance increases significantly due to the freezing of the window or deformation of the glass run in winter. If a situation occurs in which the window cannot be completely closed as a result, the pinch detection function is released by operating the power window operation switch 3B as described above, and the window can be fully closed.

Although not shown in the flowchart, the central processing circuit 3B stores the following functions in the ROM. That is, when detecting a failure of the pulse generator 2, the central processing circuit 3A notifies the failure state by the behavior of the power window motor 1 in a mode not corresponding to the operation of the power window operation switch 3B. Has the function of controlling This function will be described with reference to a time chart shown in FIG. That is, the UP SW of the power window operation switch 3B is operated from the time t1 to the time t2 in a state where the pulse generation unit 2 has failed.
When the 3B2 is operated, a motor UP drive signal is output during this operation. After that, the operation of the UP SW 3B2 is stopped, and at the same time, the motor DOWN drive signal is set to 1 until time t3.
Output during [SEC].

That is, when the pulse generator 2 is in a failure state, the occupant turns the power window operation switch 3B up.
Despite the operation on the side, the window is opened after the operation is stopped, and the window behaves abnormally, so the occupant can recognize this abnormal state and request the dealer to repair the vehicle As a result, it is possible to avoid a failure.

Next, a flowchart consisting of steps 200 to 211 of FIG. 3 shows a function of detecting the pulse signal output from the pulse generator 2 with reference to the ripple signal output from the waveform shaping circuit 3G. In other words, each time the counter value of the ripple signal output by the waveform shaping circuit 3G reaches a predetermined value, the central processing circuit 3A performs edge detection of the pulse signal output by the pulse generator 2.
1 shows a mechanism of the present invention. Specifically, step 20
When it is determined in step 1 that the rising edge of the ripple signal output from the waveform shaping circuit 3G has been detected (YES), the process proceeds to step 202. In step 202, the ripple signal counter value is incremented by 1 [count], and in step 20
Proceed to 3. In step 203, the rising edge of the pulse signal output from the pulse generator 2 is detected (YE
S), the process proceeds to step 204.

In step 204, when it is determined that the count value of the ripple signal has reached 4 [counts] or more (YES), the process proceeds to step 205. In step 205,
The pulse signal count value is stored, and steps 206 and 20 are performed.
Go to 7. In steps 206 and 207, the pulse signal count value and the ripple signal count value are reset to 0 [count], respectively, and the process proceeds to step 208. In step 208, when it is determined that the pulse signal count timer is 0 (YES), the flow proceeds to step 209. In step 209, the pulse signal count value is set to 1 [count].
And the process proceeds to step 210. In step 210, the pulse signal count timer is set, and in step 2
Proceed to 11.

The functions shown in steps 200 to 211 will be further described with reference to the time chart of FIG. The figure shows
It shows a ripple current generated by the motor, a ripple signal output by the waveform shaping circuit 3G, and a pulse signal output by the sensor interface 3H. As you can see from the figure,
The ripple signal and the pulse signal are completely synchronized, and a 1 [count] pulse signal is generated every 4 [count] of the ripple signal. Therefore, as shown in step 204, if the detection of the pulse signal is not performed until the ripple signal has generated 4 [counts], it is possible to prevent the external noise generated in the middle from being erroneously detected. For example, external noise is generated at times t4, t7, and t10 shown in FIG. 6, but this external noise can be ignored.

The central processing circuit 3A has a function of executing a window position detection process when a pulse signal is input from the pulse generator 2 via the sensor interface 3H even in the system sleep state. This allows
The window position is constantly monitored to improve detection accuracy.

Next, the flowchart consisting of steps 300 to 315 of FIG. 4 shows that the voltage signal output from the voltage detection circuit 3E and the pulse signal output from the pulse generator 2 are simultaneously inputted, and the voltage calculated from the voltage signal is inputted. The data and the window speed data calculated from the pulse signal are stored in association with each other, and the ripple signal output by the waveform shaping circuit 3G and the current signal output by the current detection circuit 3F are simultaneously inputted and the ripple signal is output. The central processing circuit 3A has the central processing circuit 3A that associates and stores the motor rotation speed data calculated from the above and the motor torque data calculated from the current signal, and corrects the pulse signal detection value based on the stored data. Indicates a function.

In other words, the driving voltage variable circuit 3C is controlled by the central processing circuit 3A and the power window motor 1
To the voltage detection circuit 3E at that time.
And a function provided in the central processing circuit 3A, such as storing the voltage data calculated from the voltage signal output by the pulse generator 2 and the pulse signal output from the pulse generator 2 in association with the window speed data. The drive voltage variable circuit 3C is controlled by the control unit, a different voltage is applied to the power window motor 1, and the motor calculated from the ripple signal output by the waveform shaping circuit 3G and the current signal output by the current detection circuit 3F at that time. The function of the central processing circuit 3A, such as storing the rotation speed data and the torque data in association with each other, is shown.

More specifically, in step 301, the driving voltage variable circuit 3C is controlled to vary the motor driving voltage, and the process proceeds to step 302. In step 302, the pulse width of the pulse signal is measured, and the process proceeds to step 303. Step 3
In step 03, the measured pulse width is converted into a window speed, and the flow advances to step 304. In step 304, when it is determined that the above conversion processing has been performed n [times] (YES), step 305 is performed.
Proceed to. In step 305, a voltage-window speed relational expression is calculated.

In step 306, the drive voltage variable circuit 3C is controlled to vary the motor drive voltage,
Go to 7. In step 307, the ripple signal is counted, and the process proceeds to step 308. In step 308, the rotational speed of the motor is calculated from the counted ripple signal, and the flow advances to step 309. In step 309, the motor current is measured based on the input signal from the current detection circuit 3F, and the motor current is converted into a torque to convert the motor current into a torque.
Go to 10. In step 310, the above conversion processing is performed by n
If it is determined that the operation has been performed [times] (YES), the process proceeds to step 311. In step 311, a motor rotation speed-torque relational expression is calculated.

In step 312, the A / D converted value of the motor drive voltage is sampled, and the flow advances to step 313. In step 313, the A / D conversion value is approximately corrected and the process proceeds to step 314. In step 314, the pulse width of the pulse signal is corrected for voltage, and the flow advances to step 315.
In step 315, pinch detection control is executed.

The voltage obtained by the above steps,
By correcting the pulse width of the pulse signal based on the window speed relational expression and the motor rotation speed-torque relational expression, pinch detection accuracy and the like are improved.

The central processing circuit 3A is connected to the AUTO UP SW 3B1, U through the switch interface 3K.
P SW3B2, DOWN SW3B3, and AUT
A motor drive circuit is connected to a power window operation switch 3B comprising an DOWN SW 3B4, connected to a pulse generator 2 via a sensor interface 3H, connected to a current detection resistor 3J via a current detection circuit 3F and a waveform shaping circuit 3G. 3I, and is connected to the power window motor 1 via a drive voltage variable circuit 3C and a voltage detection circuit 3E.
Connected to Further, the power supply circuit 3D includes the pulse generator 2
, And the power is constantly supplied to the pulse generator 2.
4 is an ignition switch and 5 is a DC power supply.

[0026]

According to the present invention, there is provided a central processing circuit for detecting the open / close position of a window and pinching of foreign matter by a window from a pulse signal output from a pulse generator connected to a power window motor, and a brush generated by the power window motor. In a power window control device including a waveform shaping circuit that processes noise and outputs a ripple signal, a function of detecting a pulse signal output by the pulse generator with reference to a ripple signal output by the waveform shaping circuit Is included in the central processing circuit, even if external noise is superimposed on the pulse signal output from the pulse generator, it is possible to eliminate the influence of the external noise and prevent a pulse width measurement error. Further, each time the counter value of the ripple signal output by the waveform shaping circuit reaches a predetermined value, the central processing circuit has a function of performing edge detection of the pulse signal output by the pulse generator. By counting ripple signals that are completely synchronized, it is possible to appropriately set the edge detection timing of the pulse signal and minimize the possibility of erroneously detecting external noise. Furthermore, since the power supply circuit is always connected to the pulse generator so that the pulse generator is always operated regardless of the operation state of the power window motor, the pulse signal is always output from the pulse generator even in the system sleep state. Is input to update the window position data stored in the central processing circuit, so that the window position data always matches the actual window position.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing functions stored in a central processing circuit shown in FIG.

FIG. 3 is a flowchart showing another function stored in the central processing circuit shown in FIG. 1;

FIG. 4 is a flowchart showing still another function stored in the central processing circuit shown in FIG. 1;

FIG. 5 is a time chart showing a motor UP drive output and a motor DOWN drive output when the power window operation switch is operated by UP or DOWN when the pulse generator shown in FIG. 1 is in a failure state.

6 is a time chart showing a ripple current generated by the motor shown in FIG. 1, a ripple signal output by a waveform shaping circuit, and a pulse signal output by a sensor interface.

[Explanation of symbols]

 Reference Signs List 1 power window motor 2 pulse generator 3 controller 3A central processing circuit 3B power window operation switch 3C drive voltage variable circuit 3D power supply circuit 3E voltage detection circuit 3F current detection circuit 3G waveform shaping circuit 3H sensor interface 3I motor drive circuit 3J current detection resistance 3K switch interface

Claims (3)

[Claims] 1. A central processing circuit (3A) for detecting an open / close position of a window and pinching of a foreign object by a window from a pulse signal output from a pulse generator (2) connected to a power window motor (1); And a waveform shaping circuit (3G) for processing a brush noise generated by the motor (1) and outputting the ripple signal as a ripple signal, wherein the pulse signal output by the pulse generator (2) is converted to the waveform The central processing circuit (3A) has a function of detecting with reference to a ripple signal output from the shaping circuit (3G).
Power window control device. 2. The pulse signal output by a pulse generator according to claim 1, wherein each time the counter value of the ripple signal output by the waveform shaping circuit reaches a predetermined value. A power window control device, wherein the central processing circuit (3A) has a function of performing edge detection. 3. The power supply circuit (3D) according to claim 1, wherein the pulse generator (2) is set to be always in operation regardless of the operation state of the power window motor (1). A power window control device constantly connected to the generator (2).