JPH03128749A - Wiper control device - Google Patents

Abstract

PURPOSE:To add an automatic wiper function without additionally increasing a switch for an exclusive use by a method wherein a second control means is energized by means of a power being to be fed from a first control means to the source input terminal for a low speed of a drive means. CONSTITUTION:A control device 3 (second control means) is located between a switch circuit 1 (first control means) and a wiper motor 2. When a wiper switch 11 is set to an IMT mode (intermittent mode), a wiper blade is driven at a wiping interval responding to a rainfall state detected by a raindrop sensor 4 to realize auto wiper operation. When the wiper switch 11 is set to an LO mode, a voltage IG is fed to a constant voltage circuit 30, in order, through a terminal +Ba, s terminal +B, a contact +1, a terminal 1a, and a terminal 1b. This constitution energizes a control circuit 31, detects the switching state of the switch 11, and holds a relay coil L3 in an exciting state so that a motor 21 is continuously run when the wiper switch is in an L0 mode.

Description

[Detailed Description of the Invention] Overview A first operating mode in which a wiper blade is continuously driven;
a second operation mode of intermittent driving is manually selected;
The wiper control device selectively supplies power to at least two types of power input terminals, one for low speed and one for high speed, of the drive means to drive the wiper blade back and forth so as to achieve the selected operation mode. , a second control means is interposed between the first control means and the drive means, and the second control means operates based on the output of the raindrop detection means when the first control means is selected in the second operating mode. By supplying power to the low-speed power input terminal of the drive means so that the operating state corresponds to the detected rain condition, and adding the second control means to the first control means, a so-called auto wiper function is added. can do.

Further, the second control means is energized by the power to be supplied from the first control means to the low-speed power input terminal of the drive means, and therefore during the rest of wiper operation and during high-speed operation, the second control means is activated. No power is applied, thereby ensuring the basic operation of the wiper even in the event of a failure of the second control means, achieving a so-called fail-safe.

INDUSTRIAL APPLICATION FIELD The present invention controls wiper operation in response to rain conditions.
The present invention relates to a so-called auto wiper control device, and more specifically, to a configuration for adding an auto wiper function to a wiper control device that does not have an auto wiper function.

Conventional technology Existing wiper control devices that do not have an automatic wiper function require a wiper switch that selects the wiper operation mode and a control that performs wiper operation according to the setting state of the switch in order to downsize the device. The circuit is arranged on one printed circuit board and is integrated. In order to add a new automatic wiper function to this wiper control device, it is necessary to detect that the wiper switch is set to the intermittent mode, and also to perform an intermittent wiper function corresponding to the rain condition detected based on the output of the raindrop sensor. It is necessary to add a new control circuit to calculate the period and control the wiper operation.

However, as described above, the existing control circuit and wiper switch are integrated, and therefore it is difficult to detect the setting state of the wiper switch from the outside. For this reason, in typical prior art, when adding a configuration for automatic wiper operation, a dedicated switch for automatic wiper operation is separately added.

Problems to be Solved by the Invention Therefore, in the above-mentioned conventional technology, in order to perform the automatic wiper operation fj, the existing wiper switch (manual operation) must be set to intermittent mode, and a dedicated switch for the newly added automatic wiper must be operated. There is a need to.

Furthermore, since the two switches are in different positions,
It is easy to cause confusion and has poor operability.

In addition, in order to add a dedicated switch for the auto wiper,
Problems arise, such as the need to modify the area around the added auto wiper, and the shape of the added auto wiper dedicated switch and the existing wiper switch not being in balance.

An object of the present invention is to provide a wiper control device that can add an auto wiper Rfm without adding a dedicated switch.

Means for Solving the Problems The present invention provides a drive means for reciprocating a wiper blade and comprising at least two FL type power input terminals for low speed and high speed use, and a first operation for continuously driving the wiper blade. mode and a second operation mode of intermittent driving are manually selected and selectively supplies power to each power input terminal of the driving means, a raindrop detection means, and the driving means. interposed between the first control means and the first control means when the second operation mode is selected: 1. a second control means for supplying electric power to the power input terminal of the drive means so as to be in an operating state corresponding to the rain state detected based on the output of the raindrop detection means, the second control means , a wiper control device characterized in that it is energized by electric power to be supplied from the first control means to the low-speed power input terminal of the drive means.

Further, in the present invention, the first control means includes a plurality of contacts that are in switching states corresponding to the first and second operation modes, and the second control means derives an identification signal to the first control means, and the second control means outputs an identification signal to the first control means. It is characterized by detecting the switching state of the contact.

Furthermore, in the present invention, the first braking means includes a plurality of contacts that are in switching states corresponding to the first and second operation modes, and the impedance in the circuit changes in response to the switching state of the contacts. and the second control means derives a test pulse to the first control means,
The switching state is detected based on a level change of the test pulse caused by the impedance.

(According to the present invention, the first control means continuously drives the wiper blade when the first operation mode is selected, and drives the wiper blade intermittently when the second operation mode is selected. In this way, power is selectively supplied to at least two types of power input terminals, one for low speed and one for high speed, of the driving means.

Between the first control means and the drive means there is a second control means according to the present invention.
Control means are interposed, the second control means being energized by the power to be supplied to the low speed power input terminal of the drive means.

The first control means is provided with a plurality of contacts for switching switching states corresponding to the first and second dynamic fY modes, and the second control means sends an identification signal and an inspection signal to the first control means. Derive pulses, etc. Thereby, the second control means detects the switching state of the first control means based on a change in the level of the test pulse caused by an impedance within the first control means that changes in accordance with the switching state.

As a result of the detection, when the first control means is selected to the second automatic mode, the second control means is in an operating state corresponding to the rain state detected based on the output of the raindrop detection means. , supplies power to the power input terminal of the driving means. In this way, the switching state of the wiper switch can be detected and the auto wiper operation can be realized without adding a new dedicated auto wiper switch to the existing wiper switch.

Further, when the first control means is selected to the first operation mode or is inactive, power is not supplied to the second control means, so even if the second control means fails, the first control means is not supplied with power. The basic functions of the control means are ensured, thus achieving failsafe.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of an embodiment of the present invention. Existing switch circuit 1 which is the first control means
By interposing the control device 3, which is a second control means, between the wiper switch 11 and the wiper motor 2, when the wiper switch 11 is set to the intermittent mode, ■NT mode, it corresponds to the rain condition detected by the raindrop sensor 4. The wiper blade is driven at the specified wiping interval, achieving automatic wiper operation! Sign.

Therefore, in the existing wiper control device, the wiper motor 2
, the terminal +1d connected to the low-speed power input terminal P1 of the motor 21 is connected to the terminal +1a of the switch circuit 1, and the terminal +2d connected to the high-speed power input terminal P2 is connected to the terminal +2Ec of the switch circuit 1. connected to
Terminal + connected to common contact S2a of cam switch 22
Sd is connected to the terminal +Sa of the switch circuit 1.

The switch circuit 1 includes a wiper switch 11 and a circuit connected to the wiper switch 1 on one printed circuit board, and terminals +Sa, +2a, +1a correspond to the setting mode of the wiper switch 11. The potential of each changes. Terminal +Ba is supplied with power from battery 6 via ignition key switch 5, and terminal Ga is grounded.

The wiper switch 11 has OFF, INT, 1. -O
It is possible to set four operating modes: HI and HI. When set to OFF mode, wiper operation is suspended.

When set to the second operation mode, INT mode, the wiper blade is driven at a wiping interval corresponding to the rain condition. When set to the first operating mode, LO mode and HI mode, the wiper blade is driven continuously and the L
It is driven at low speed in O mode and at high speed in I-II mode.

In this FIG. 1, the wiper switch 11 is
It shows the connection state of the contacts in the t' mode, that is, in the OF'F mode, the contacts +1 and +S conduct, and the contacts 1NT1 and B1 conduct, and in the INT mode, the contacts +1 and +S conduct, and Contact lNT
1 and TNT2 conduct, and in LO mode, contact B and +
1 is electrically connected, and in the HI mode, contact B and +2 are electrically electrically connected.

When the wiper switch 11 is set to the OFF mode, the terminal +1 is connected to the constant voltage circuit 3° in the control bag W3.
The voltage IG of the battery 6 is applied via the ignition key switch 5 via the b terminal + 1 a - contact + 1 - contact + S - contact 5 la - contact 5 lc one terminal + Sa one terminal → -5 b - resistor R2 - resistor R1 one terminal + Bb. However, in this state, due to the current limitation of the resistors R1 and R2, sufficient power is not supplied to energize the control circuit 31 that performs the auto wiper control operation, and therefore the control circuit 31 is in a dormant state.

In the OFF mode, one terminal of the capacitor C1 is connected via resistors R1 and R2, and the other terminal is connected to resistors R1a and R1b for setting the intermittent time;
via a resistor R1e connected in parallel to R1b and having a resistance value smaller than the formed resistance value of the resistors R1a and R1b,
Since the voltage IQ is applied, the capacitor C1 is discharging.

Therefore, when wiper switch 11 is set to INT mode, contact lNTl - contact INT2 - diode D
1-Capacitor C1a is charged via resistor R1c,
When the capacitor C1a is fully charged and the voltage between the terminals exceeds a predetermined value, the transistor Tri becomes conductive.

This excites the relay coil L1, switches the relay switch SL, and terminal + Ba - contact 5lb - contact 5la - contact + S - contact +1 one terminal + 1a one terminal + 1b
The voltage IG is supplied to the constant voltage circuit 3 through. When the control circuit 31 is energized in this way, it detects the switching state of the wiper switch 11 as described later, and when the control circuit 31 is in the INT mode, it changes the output from the raindrop sensor 4 via the waveform shaping circuit 34. Based on this, the auto wiper control operation is performed.

3. As described above, the resistor R1e is connected in parallel to the resistors R1b and R1a in the OFF mode to reduce the time constant for charging the capacitor C1. therefore,
The setting mode of the wiper switch 11 is INT-OFF-
As when switched to INT, capacitor C1
Even if the battery is once discharged, it can be rapidly charged, and thereby the control circuit 31 can be started up quickly.

The output of the control circuit 31 during this auto wiper operation is transmitted via the diodes D3a and D4=t to the relay coil L3. It is derived to L4. That is, when the wiper is driven at low speed, the relay coil L3 is excited, and the relay coil L3 is excited.
4 is demagnetized. As a result, the terminal +Bb- contact 53
b - contact 53a - contact 54a - contact 54c - terminal +10
Electric power from the battery 6 is supplied to the low-speed power input terminal P1 of the motor 21 via one terminal→−1d. Furthermore, during high-speed wiper driving, both relay coils L3 and L4 are excited, and power is supplied to the high-speed power input terminal P2 of the motor 21. Furthermore, at the time of intermittent operation, relay coil L3. Both L4 are demagnetized.

When the wiper switch 11 is set to the LO mode, the voltage IG is supplied to the constant voltage circuit 30 from the terminal +B a-
The contact S-contact +1 is supplied via the terminal +1a and the terminal +1b. As a result, the control circuit 31 is energized,
The switching state of the wiper switch 11 is detected as described later, and when the wiper switch 11 is in the LO mode, the motor 21 is
Relay coil L3 is held in an excited state so as to drive continuously at low speed.

When the wiper switch 11 is set to the Hl mode, power is not supplied to the constant voltage circuit 3o, and the control circuit 31 is in a dormant state.
B-contact +2 one terminal +2a one terminal←21: +- relay coil L3. through diodes D3b, D4b. Power is supplied to L4 and it is excited! However, the power from the battery 6 is connected to terminal +Bb - contact S 3 b - contact S 3 a
11 Point S 4 A-contact S/lb terminal 4-2 (one terminal +2 d) Supplied to the high-speed power input terminal P2 of the motor 21.

The wiper motor 2 is composed of a motor 21 and a cam switch 22, and the cam 23 of the cam switch 22 rotates in accordance with the wiping position of the wiper blade.When the motor 21 is stopped when the wiper blade is in the rest position, In this state, the common contact S2a of the cam switch 22 is the individual contact S2c.
Therefore, the terminal +Sc of the control device 3 is connected to the terminal Gd, which is connected to the ground terminal pG of the motor 21, through the terminal fsd, the contact 52a, and the contact S2c, and is set to the ground potential. When the cam switch 22 rotates, for example, by 30 degrees or more, the common contact S2εi becomes the individual contact S
2b, and therefore, the voltage IG of the battery 6 supplied to the terminal +Bd is derived from the terminal +Bd.

In the INT mode and all LO modes, the potential of the terminal +Sc of the control 'A position 3 is inputted via the processing circuit 32.
The control circuit 31 continues to excite the relay coil L3 during the wiping operation of the wiper blade, and returns the wiper blade to the above-mentioned rest position. Let me go home.

Further, when the wiper switch 11 is switched to the OFF mode with the wiper blade away from the rest position, the power supply to the control circuit 31/\ is reduced to 31! in the INT mode and the LO mode. Therefore, the supply of excitation current to relay coil L3 via diode D3a is stopped, and in the II mode, relay coil L3 . The supply of excitation current to L4 is stopped, whereby the common contact S3a of the relay switch S3 conducts to the individual contact S3c, and the common contact S4a of the relay switch S4 conducts to the individual contact S4c.
The power supply to the low-speed power input terminal P1 of the motor 21 continues until the wiper blade returns to the rest position.

As mentioned above, when the wiper switch 11 is set to the LO all mode and the INT mode, the constant voltage circuit 3
The control circuit 31 is energized via o, so the control circuit 31 detects the switching state of the wiper switch 11 as follows, and performs an auto wiper control tapping operation when in INT mode, and when in LO all mode. The motor 21 is continuously driven at low speed.

The second I2I is a circuit diagram for explaining the connection state in the switch circuit FlBl when the wiper switch 11 is set to the INT mode or the LO all mode.

The control circuit 31 outputs, for example, a pulse width of 2 m5ec and a pulse interval of m200In as shown in FIG. 3(1).
A low-level pulse of Set t is derived, and the pulse generation circuit 3 is realized by a transistor or the like.
3, as shown in FIG. 3 (2), and then led out from the terminal +sb via the resistor R2.

This pulse is applied to contacts rNT1 and I of wiper switch 11.
When the diode D1 is electrically conductive with NT2, the diode D1
, resistors R1c, R1d, and transistor Tr1.

That is, from an AC point of view, when the LO all mode is set, the pulse from the pulse generation circuit 33 is
As shown in the figure <1), the resistor R2 and the resistor R1b
, R1a and appears at terminal +sb. Also I
When the NT mode is set, the voltage is divided by the resistor R2, the combined impedance of the resistors R1b, R1a, and the relay drive circuit 18, and appears at the terminal +sb, as shown in Figure 4 (2).

Therefore, the peak value VL in INT mode is the third [J
As shown in (3), it takes a small value, for example, IV, whereas the wave height of all LO modes [VI-1 takes a high value, for example, 3V, as shown in FIG. 3 (4>).

By comparing these peak values VL and VH with the base wall voltage (a) predetermined by the level discrimination circuit 35,
The setting mode of the wiper switch 11 can be read. In the level discrimination circuit 35, the input voltage is divided by, for example, 1/2 in a zero voltage divider circuit composed of, for example, a voltage divider circuit, a comparator, and a reference voltage source.
□ is set to 1.1■, for example.

In this way, the wiper control device according to the invention replaces the existing switch [Ii? A control device 3 for adding an auto wiper function is provided between the wiper motor 2 and the wiper motor 2, and the control device 3 is connected to the wiper switch 1 in the switch circuit 1.
Therefore, there is no need to provide a dedicated switch for the auto wiper separately from the existing wiper switch 11, and therefore there is no need to confuse the operator, and it is possible to increase the number of dedicated switches. This eliminates the need for accompanying modifications, simplifies installation work, and does not impair the aesthetics.

Furthermore, since the control circuit 31 that performs the auto wiper control operation is energized only when the wiper switch 11 is in the INT mode and the LO mode, the OF
In the F mode and the H2 all mode, the control circuit 31 is put into a rest state, and a fail-safe function can be ensured when the control circuit 31 runs out of control or malfunctions due to dirt adhering to the raindrop sensor 4.

Effects of the Invention As described above, according to the present invention, the second control means for performing an auto wiper operation is interposed between the first control means and the drive means of a wiper control device that does not have an auto wiper function,
This second control means derives an identification signal, a test pulse, etc. to the first control means and detects the switching state of the contact that changes the operation mode, so the auto wiper function can be performed without adding a dedicated switch for the auto wiper. can be added.

Further, since the second control means is energized by the power to be supplied from the first control means to the low-speed power input terminal of the drive means, the second control means The control means is not energized with power, so that even if the second control means fails at t3, the basic operation of the wiper can be ensured, and fail-safe can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a wiper control device according to an embodiment of the present invention, and FIG. 2 shows that the wiper switch 11 is
A circuit diagram for explaining the connection state in the switch circuit 1 when set to NT mode or LO mode, FIG. 3 is a waveform diagram for explaining the inspection operation for reading the setting mode of the wiper switch 11, Figure 4 shows the switch circuit l
FIG. 3 is an equivalent circuit diagram when a pulse is applied to. l... Switch circuit, 2... Wiper motor, 3...
- Control device, 4... Raindrop sensor, 5... Ignition key switch, 6... Battery, 11... Wiper switch, 30... Constant voltage circuit, 31... Control circuit, 32...・Processing circuit, 33...Pulse generation circuit, 3
4...Waveform shaping circuit, 35...Level discrimination circuit (1) (2)

Claims (3)

[Claims] (1) A driving means for reciprocating the wiper blade and having at least two types of power input terminals for low speed and high speed; a first operation mode for continuously driving the wiper blade; and a first operation mode for driving the wiper blade intermittently; a first control means for selectively supplying power to each power input terminal of the drive means; a raindrop detection means; between the drive means and the first control means, a second operating mode being manually selected; the power supply input terminal of the drive means so that when the first control means is selected in the second operation mode, the operation state corresponds to the rain condition detected based on the output of the raindrop detection means; a second control means for supplying power to the drive means, and the second control means is energized by the power to be supplied from the first control means to the low-speed power input terminal of the drive means. wiper control device. (2) The first control means includes a plurality of contacts that are in switching states corresponding to the first and second operation modes, and the second control means derives an identification signal to the first control means and controls the contacts. The wiper control device according to claim 1, wherein the wiper control device detects a switching state. (3) The first control means includes a plurality of contacts that are in switching states corresponding to the first and second operation modes,
The impedance in the circuit changes in response to the switching state of the contact, and the second control means derives a test pulse to the first control means,
The wiper control device according to claim 1, wherein the switching state is detected based on a level change of the test pulse caused by the impedance.