JP2887224B2 - Wiper control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper control device, and more particularly to a wiper control device capable of switching a motor for causing a wiper blade to perform a wiping operation to at least two or more different speeds.

[0002]

2. Description of the Related Art When a vehicle is driven for a long time, for example, it becomes accustomed, and especially when the vehicle is continuously driven at a constant speed for a long time, fatigue may occur. In such a case, it is necessary to alert the driver by giving the driver some sort of stimulus.

By the way, the wiper device is operated during rainy weather, and the wiper blade is performing a wiping operation within the field of view of the driver. Therefore, it is conceivable that the driver may be visually stimulated by the wiper blade to eliminate fatigue.

[0004]

SUMMARY OF THE INVENTION In view of such findings of the present inventors, a main object of the present invention is to provide a wiper control device capable of preventing fatigue due to continuous operation.

[0005]

According to the present invention, there is provided a motor for causing a wiper blade to perform a wiping operation, and control means for switching the motor to at least two or more different speeds. This is achieved by providing a wiper control device comprising: a wiper control device characterized in that the control means switches the different speeds irregularly and automatically. In particular, the automatic switching
/ F ⁿ (n = 1, 2,...) May be determined by fluctuation control.

[0006]

In this manner, when the wiper device is operated, the wiping speed of the wiper blade can be switched, for example, irregularly, and when the wiper speed is not predicted, the wiping speed is switched. Can be given. In particular, by switching with 1 / f ⁿ (n = 1, 2,...) Fluctuation that is considered to have a close relationship with human comfort / discomfort, the wiping speed can be changed without giving any discomfort.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a main part circuit diagram showing a control circuit of a wiper device for a vehicle to which the present invention is applied. In FIG. 1, a power terminal of a motor 1 for performing a reciprocating wiping operation of a wiper blade (not shown) through a link mechanism to remove raindrops attached to a front windshield of an automobile is a positive terminal of a battery (not shown). Is connected to

The motor 1 has a low-speed terminal LO for low-speed rotation and a high-speed terminal HI for high-speed rotation. The normally closed contact of the relay RY1 is connected to the low-speed terminal LO.
Is connected to a normally open contact of the relay RY2. The low-speed terminal LO is connected to the common terminal of the two-position selection contact of the relay RY3 via the open / close contact of the relay RY1, and when the relay RY1 is in the non-excited state, the terminal selected when the relay RY3 is excited. To be grounded. The high-speed terminal HI is grounded when the relay RY2 is in an excited state.

The coils of the relays RY1 and RY2 are connected to a high-speed switch SW1 of a manual switch 2 which is selected when the wiper blade is moved at a high speed. When the high-speed switch SW1 is closed, both coils are excited. . The coil of the relay RY3 is connected to the low-speed switch SW2 of the manual switch 2, which is selected when the wiper blade is moved at a low speed, and is excited when the low-speed switch SW2 is closed.

The motor 1 is provided with an automatic stop switch SW3 for stopping the wiper blade at a predetermined stop position. Auto stop switch SW
Numeral 3 is switched in conjunction with the motor 1, is connected to the power supply terminal side at the stop position, and switches to the ground terminal side at positions other than the stop position. Therefore, when the high-speed switch SW1 and the low-speed switch SW2 are opened to stop the wiper operation, the auto-stop switch SW3 is not set except at the stop position.
And relay RY3 and relay RY1 via each contact,
Since the low-speed terminal is grounded, the low-speed operation is performed, and when the stop position is reached, the auto-stop SW3 switches to the power supply terminal, so that the power supply terminal of the motor 1 and the low-speed terminal are short-circuited, and the motor 1 is stopped by power generation braking.

In the present wiper control device, a fluctuation control circuit 3 is provided as shown in FIG. The control unit CPU of the fluctuation control circuit 3 has two input terminals I1 and I2.
And two output terminals O1 and O2. The common terminal of the auto stop switch SW3 is connected to the input terminal I1, and the start switch SW4 for performing the fluctuation control is connected to the input terminal I2. ing. The output terminal O1 is connected to the base of a transistor Tr1 provided in parallel with the low-speed switch SW2 to selectively excite the coil of the relay RY3, and the output terminal O2 is connected to the high-speed switch to excite the coil of the relay RY2. It is connected to the base of a transistor Tr2 provided in parallel with SW1.

Next, the operation of the wiper control device will be described with reference to FIG.
This will be described below with reference to the flowchart of FIG.

First, when the start switch SW4 is closed to perform the fluctuation control, an initial setting is performed as shown in step ST1 of FIG. In this initial setting, initial settings such as port, timer, and interrupt processing are performed. In the next step ST2, processing is performed for a predetermined time. Here, for example, a process of setting the timer flag to 1 every 10 ms in a timer interrupt routine is performed. In step ST3, when the timer flag is 0, the process returns to step ST2, and when the timer flag is 1, the process proceeds to step ST4. Step ST
At 4, the timer flag is set to 0, and the process proceeds to step ST5.

In step ST5, the signal input of the fluctuation control start switch SW4 is processed, and the automatic stop switch SW1 is used as the origin position signal of the wiper blade.
After reading the high level signal, the wiper operation flag is set.

In step ST6, if the wiper operation flag has been set, the respective states of high-speed and low-speed wiping / stopping and the respective times are set in a wiping pattern as shown in FIG. The wiping pattern in FIG. 3A is a pattern in which the high-speed / low-speed and stop modes of the wiper blade are created based on a waveform obtained from, for example, 1 / f fluctuation control. In the wiping pattern shown in FIG. 3A, for example, one cycle is performed for a predetermined time, and when the operation is performed for a longer time, the cycle is repeated.

In the next step ST7, the duration of each mode is compared with the timer count time in each operation according to the pattern, and a mode change flag is set after the timer count time has elapsed. Then, in step ST8, the start switch SW4 and the auto stop switch SW1
The motor drive output process is performed according to the signal state of (1), and the process returns to step ST2.

The switching timing of the motor speed in the wiping time setting process in step ST6 will be described below with reference to FIG.

FIG. 4 shows the mode from the end of mode A. If the timer counter counts up during the duration of mode A when the timer counter is not at the home position as indicated by T1 in the figure, the next auto stop switch is activated. When SW3 rises (from L to H), the mode is switched to the next mode B according to the pattern. In the mode B in the case of FIG. 4, an off signal is output from the output terminal O1, a signal for turning on the transistor Tr2 is output from the output terminal O2, the coil of the relay RY2 is excited, and the motor 1 rotates at high speed. Start a fast wiping movement.

In the next mode B, since the count is incremented when it is not at the origin position, the next mode C is set when the auto stop switch SW3 rises after the count up.
Switch to. In the mode C in the case of FIG.
Outputs an ON signal for turning on the transistor Tr1, and outputs an OFF signal from the output terminal O2.
The Y3 coil is excited, and the motor 1 starts a low-speed wiping operation in which the motor 1 rotates at a low speed.

In the mode C, for example, when counting up at the origin position as shown at T2 in the figure, instead of the H signal of the auto stop switch SW3, the next mode D is set when the next auto stop switch SW3 rises. Switch. In mode D, both output terminals O1 and O1
2 to output an off signal to bring the apparatus to a stop state as shown in FIG. As described above, the stop state in which the speed is 0 can be selected as one mode of the different speeds.

In the mode in the stop state, as shown by T3 in the figure, the mode is switched to the next mode in response to the count-up signal during the stop. In FIG. 4, the mode is switched from the mode D in the stopped state to the next mode E, and the low-speed wiping motion in the mode E is started.

As shown in FIG. 3 (a), three types of speeds, high speed / low speed and stop, are used as the different speeds, and switching of these speeds is determined based on, for example, 1 / f fluctuation. Perform according to the pattern. This wiping pattern is, for example, as shown in FIG.
By changing the power spectrum as a relationship inversely proportional to the frequency, a suitable visual stimulus can be given to the driver. This time, the speed corresponding to each mode is switched at the timing when the wiper blade is at the origin position, but it is also possible to switch the speed during wiping.

In the present embodiment, the wiping pattern based on a combination of three wiping speeds of high speed, low speed, and stop is 1 / f
Was created based on the fluctuation, in the present invention, irregularly may be a shall then automatic transmission, for example, a low-speed wiping the base, changing the respective proportions when to switch to high-speed and stopping and Alternatively, the selection may be made only by switching between low speed and high speed. In addition,
For the predetermined wiping pattern, for example, a signal that varies irregularly, such as a vehicle speed, an inter-vehicle distance, or a steering wheel operation angle, may be input.

In the present embodiment, the fluctuation control circuit 3 is simply added to the manual switch 2 of the conventional wiper device capable of selecting three modes of high speed, low speed and intermittent by a wired OR. It can be realized without modification. Further, when the fluctuation control circuit 3 breaks down, a connector or the like at the connecting portion is removed,
Only the conventional wiper control circuit can be used. Further, in this embodiment, the high-speed and low-speed relays are provided on the vehicle body side, but in a wiper device without a relay,
This can be handled by incorporating a relay in the fluctuation control circuit.

[0026]

As described above, according to the present invention, since the different wiping speeds of the wiper blades are automatically switched irregularly, it is possible to give a stimulus to the driver's vision, and to perform the operation for a long time. Fatigue can be suitably prevented in rainy weather. In particular, by changing the 1 / f ⁿ (n = 1, 2,...) Fluctuation, the wiping speed can be switched without giving discomfort.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram of a vehicle wiper device to which the present invention is applied.

FIG. 2 is a flowchart of wiper control based on the present invention.

FIG. 3A is a wiping pattern diagram of wiper control based on the present invention, and FIG. 3B is a diagram showing a relationship between a frequency of 1 / f fluctuation and a power spectrum.

FIG. 4 is a time chart showing mode switching timing.

[Explanation of symbols]

 1 Motor 2 Manual switch 3 Fluctuation control circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-26148 (JP, A) JP-A-63-31849 (JP, A) Real opening Sho-63-26467 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) B60S 1/08

Claims (2)

(57) [Claims] 1. A wiper control device comprising: a motor for causing a wiper blade to perform a wiping operation; and control means for switching the motor to at least two or more different speeds, wherein the control means includes A wiper control device wherein the speed is automatically switched irregularly . 2. The method according to claim 1, wherein the automatic switching is performed by 1 / f ⁿ (n = 1,
2. The wiper control device according to claim 1, wherein the wiper control device is determined by fluctuation control.