JPH09221003A - Wiper controller for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop/move function which automatically switches a wiper mode of a wiper, when a vehicle enters a stop state from a running state, through inexpensive constitution. SOLUTION: When a wiper switch 9 is on a low speed wiping mode position LO, since a transistor 11 is continuously turned on so as to electrify an exciting coil 10b, an electrifying passage for a wiper motor 5 is formed through contacts (c to a) of a relay switch 10a. When the vehicle is in a running state, since the charge of a condenser 13 is discharged by a transistor 14, which was turned on, a transistor 12 is put off, while the transistor 11 is held in an 'on' state. When the vehicle stops, since the transistor 14 is turned off, the condenser 13 is charged through contacts (c to a) of a scheduledposition-stop-switch 6 and while the wiper is out of the 'wait' position. Thus, the transistor 12 is turrted on, while the transistor 11 is forcibly turned off. This 'off' state is maintained until a prescribed time has elapsed after the wiper returned to the 'wait' position to start the discharge of the condenser 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wiper control device having a so-called stalling function of automatically switching a wiper wiping mode when a vehicle changes from a running state to a stopped state.

[0002]

2. Description of the Related Art In general, a stop function set in a vehicle wiper control device further enhances a wiper wiping mode in a running state when the vehicle is in a stopped state. It is configured to automatically switch to the low state.
Specifically, it switches to the low speed wiping mode when it is in the high speed wiping mode, switches to the intermittent wiping mode when it is in the low speed wiping mode, and extends the pause period of the intermittent wiping operation when it is in the intermittent wiping mode. The operation to do is automatically performed.

When such a stopping function is added, in the conventional vehicle wiper control device, the stopping function includes a variable wiper angle wiper function and a vehicle speed sensitive wiper function mainly provided for high-end vehicles. It is realized by using a microcomputer for.

[0004]

However, in the vehicle wiper control device configured as described above, the microcomputer is required to realize the stop function, and therefore,
The hardware configuration is inevitably expensive, and therefore it has been difficult to mount it on a vehicle of a mass car class.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive construction of a stop function of automatically switching a wiper wiping mode when a vehicle is in a stopped state from a running state. It is an object of the present invention to provide a vehicle wiper control device that can be realized by the above, and can be easily installed in a vehicle of a popular vehicle class.

[0006]

In order to achieve the above object, the invention according to claim 1 is operated only during the period from the start of the wiping operation of the wiper to the return of the wiper to the standby position to form the energizing path of the wiper motor. In a vehicle wiper control device for controlling a wiper provided with a fixed position stop switch for holding a state, a switching means having a normally open contact that is turned on in an operating state, and the switching when the switch is turned on. A first switching element for switching the means to an operating state, a first contact circuit for turning on the first switching element in a state of being operated to a continuous wiping mode position, and the switching for switching to an operating state in response to the turning on. A wiper switch having a second contact circuit that forms a current path of the wiper motor through a normally open contact of the means, and the fixed position The timer capacitor is charged through the fixed position stop switch during the period when the stop switch is operated, and discharges with a predetermined time constant during the fixed position stop switch operation stop period, and the timer capacitor is charged. A second switching element which is provided so as to be turned on during a period when the electric charge has a predetermined level or more and forcibly turns off the first switching element in the on state, and an on state which is provided when the vehicle is running And a running detection switch connected so as to discharge the charge charged in the timer capacitor in the ON state.

According to this structure, when the vehicle is in the traveling state, the traveling detection switch is in the on state, so that the charge for the timer capacitor is discharged. Therefore, in the traveling state of the vehicle, since the second switching element remains off, the second switching element does not turn off the first switching element.

When the wiper switch is operated to the continuous wiping mode position in the above vehicle traveling state, the first switching element is turned on by the first contact circuit of the wiper switch, and Since the switching means is switched to the operating state depending on the ON state,
The normally open contact of the switching means is turned on. Then, the energizing path of the wiper motor is formed via the normally open contact and the second contact circuit of the wiper switch, and the wiper wiping operation is started.

At this time, during the period in which the wiper switch is in the continuous wiping mode position, the state in which the current path of the wiper motor is formed via the normally open contact and the second contact circuit remains held, so that the wiper motor is maintained. The wiping operation is continuously performed.

When the vehicle is stopped from the state in which the wiper is continuously wiped in this manner, the traveling detection switch is switched to the off state. Therefore, during the period in which the fixed position stop switch is operated, the timer capacitor is turned on. On the other hand, the second switching element is turned on while being charged via the fixed position stop switch and the charged electric charge is at a predetermined level or higher. Then, the first switching element is forcibly turned off, so that the switching means is kept in the operation stop state, and during the operation stop period, the wiper motor is connected through the normally open contact of the switching means. The electric path formation state is released.

However, during the period when the wiper is not in the standby position, the wiper motor energization path is held by the fixed position stop switch in the operating state, and accordingly, the wiper returns to the standby position and stops in the fixed position. Only when the switch returns to the stopped state, the wiper motor will be cut off.

In the state where the fixed position stop switch is deactivated, the charge of the timer capacitor is discharged with a predetermined time constant, and accordingly, when the charge becomes lower than a predetermined level. , The second switching element is returned to the off state. Then, the forced off state of the first switching element is released and returned to the on state, so that the switching means is switched to the operating state and the normally open contact of the switching means and the second contact circuit of the wiper switch are opened. Through this, the power supply path of the wiper motor is re-formed, and the wiper wiping operation is restarted.

After that, the energization path of the wiper motor is intermittently formed in response to the charging and discharging of the timer capacitor as described above, whereby the intermittent wiping operation by the wiper is performed. That is, when the vehicle stops after the wiper is operated in the continuous wiping mode, the wiper can be automatically switched to the intermittent wiping mode.

As described above, when the vehicle starts traveling from the state in which the wiper is automatically switched to the intermittent wiping mode in response to the stop of the vehicle, the traveling detection switch is turned on, and the timer is activated. Since the charging charge of the capacitor for use is discharged, the first switching element is not forcibly turned off by the second switching element. Therefore, the wiper wiping operation described above is automatically returned to the state in which it is continuously performed.

The stall function is obtained as described above, and in this case, the stall function can be realized only by inexpensive discrete circuit parts, and the manufacturing cost can be suppressed. As a result, it can be easily mounted on a vehicle of a mass-market class.

According to a second aspect of the present invention, in order to achieve the above object, the wiper motor is operated for a period from the start of the wiping operation of the wiper to the return of the wiper to the standby position to maintain the energized path forming state of the wiper motor. In a vehicle wiper control device for controlling a wiper provided with a fixed-position stop switch, a switching means having a normally-open contact that is turned on in an operating state, and the switching means when the switching means is turned on. A first switching element for switching,
While being charged in the positive direction through the fixed position stop switch during the period when the fixed position stop switch is stopped,
An intermittent wiping mode capacitor that performs a discharging operation during a period in which the fixed position stop switch is operated, a first contact circuit that turns on the first switching element in a state where the continuous wiping mode position is operated, and an on state thereof. The capacitor for the intermittent wiping mode has a second contact circuit that forms an energization path of the wiper motor through a normally open contact of the switching means that is switched to an operating state according to the operation state, and is operated to the intermittent wiping mode position in the state of being operated. Forming a conduction path of the wiper motor through a third contact circuit for turning on the first switching element on the basis of the electric charge of the wiper motor and a normally-open contact of the switching means which is switched to an operating state in response to the turning on. A wiper switch having a four-contact circuit and a fixed position stop switch during the period when the fixed position stop switch is operated. And a timer capacitor that discharges with a predetermined time constant during the operation stop period of the fixed position stop switch, and is turned on during a period when the charge of the timer capacitor is equal to or higher than a predetermined level. And a second switching element forcibly turning off the first switching element in its ON state and a second switching element in the ON state in the running state of the vehicle. In a state where the traveling detection switch connected to discharge the charged electric charge and the wiper switch are operated to the intermittent wiping mode position, the first switching element is operated regardless of the ON state of the second switching element. An intermittent wiping mode priority circuit that functions to be turned on by the charge of the intermittent wiping mode capacitor. It is obtained by the.

According to this structure, when the vehicle is in the traveling state, the traveling detection switch is in the on state, so that the charge for the timer capacitor is discharged. Therefore, in the traveling state of the vehicle, since the second switching element remains off, the second switching element does not turn off the first switching element.

When the wiper switch is operated to the continuous wiping mode position while the vehicle is running as described above, the first contact element of the wiper switch turns on the first switching element and Since the switching means is switched to the operating state depending on the ON state,
The normally open contact of the switching means is turned on. Then, the energizing path of the wiper motor is formed via the normally open contact and the second contact circuit of the wiper switch, and the wiper wiping operation is started.

At this time, during the period in which the wiper switch is in the continuous wiping mode position, the state in which the energization path of the wiper motor is formed via the normally open contact and the second contact circuit remains held, and thus the wiper motor is maintained. The wiping operation is continuously performed.

When the vehicle is stopped from the state in which the wiper is continuously wiped in this manner, the traveling detection switch is switched to the off state, so that the timer capacitor is operated during the period in which the fixed position stop switch is operated. On the other hand, the second switching element is turned on while being charged via the fixed position stop switch and the charged electric charge is at a predetermined level or higher. Then, the first switching element is forcibly turned off, so that the switching means is kept in the operation stop state, and during the operation stop period, the wiper motor is connected through the normally open contact of the switching means. The electric path formation state is released.

However, when the wiper is not in the standby position, the wiper motor energization path is held by the fixed-position stop switch in the operating state, and accordingly, the wiper returns to the standby position and stops in the fixed position. Only when the switch returns to the stopped state, the wiper motor will be cut off.

In the state where the fixed position stop switch is deactivated, the charge charge of the timer capacitor is discharged with a predetermined time constant, and accordingly, when the charge charge becomes lower than a predetermined level. , The second switching element is returned to the off state. Then, the forced off state of the first switching element is released and returned to the on state, so that the switching means is switched to the operating state and the normally open contact of the switching means and the second contact circuit of the wiper switch are opened. Through this, the power supply path of the wiper motor is re-formed, and the wiper wiping operation is restarted.

After that, the energizing path of the wiper motor is intermittently formed in response to the charging and discharging of the timer capacitor as described above, whereby the intermittent wiping operation by the wiper is performed. That is, when the vehicle stops after the wiper is operated in the continuous wiping mode, the wiper can be automatically switched to the intermittent wiping mode.

As described above, when the vehicle starts traveling from the state in which the wiper is automatically switched to the intermittent wiping mode in response to the stop of the vehicle, the traveling detection switch is turned on and the timer is activated. Since the charging charge of the capacitor for use is discharged, the first switching element is not forcibly turned off by the second switching element. Therefore, the wiper wiping operation described above is automatically returned to the state in which it is continuously performed.

The stalling function is obtained as described above, and even in this case, the stalling function can be realized only by inexpensive discrete circuit parts, and the manufacturing cost can be suppressed. As a result, it can be easily installed in a mass-vehicle class vehicle.

On the other hand, when the wiper switch is operated to the intermittent wiping mode position, the intermittent wiping mode capacitor charges in the positive direction through the fixed position stop switch during the period in which the fixed position stop switch is stopped. Will be done. Therefore, when the wiper switch is operated to the intermittent wiping mode position, the third contact circuit of the wiper switch turns on the first switching element based on the charge of the intermittent wiping mode capacitor. Then, the switching means is switched to the operating state in response to such turning on. Therefore, in response to the normally open contact of the switching means being turned on, an energizing path of the wiper motor is formed via the normally open contact and the fourth contact circuit of the wiper switch, and the wiper wiping operation. Is started.

When the wiping operation of the wiper is started in this way, the fixed position stop switch is activated to discharge the electric charge charged in the intermittent wiping mode capacitor, so that the first switching element is turned off. Then, the operation of the switching means is stopped, and in response to this, the energized path forming state of the wiper motor via the normally open contact of the switching means is released.

In this case, when the wiper motor is released from the energized path forming state as described above, when the wiper is in the standby position, the wiper motor is cut off as it is, but when the wiper is not in the standby position. The energizing path of the wiper motor is held by the fixed position stop switch, and accordingly, when the wiper returns to the standby position and the fixed position stop switch returns to the operation stop state, the wiper motor is cut off. .

When the operation of the fixed position stop switch is stopped as described above, the intermittent wiping mode capacitor is recharged in the positive direction, and after a lapse of a predetermined time, the charge level of the capacitor becomes a predetermined level or more. Then, the third contact circuit of the wiper switch causes the first contact circuit based on the charged electric charge of the intermittent wiping mode capacitor.
The switching element of will be turned on again. Therefore, after that, the energization path of the wiper motor is intermittently formed according to the charging and discharging of the intermittent wiping mode capacitor as described above, and thus the intermittent wiping operation by the wiper is performed.

In this case, when the wiper switch is operated to the intermittent wiping mode position, the intermittent wiping mode priority circuit causes the first switching element to operate in the intermittent wiping mode regardless of the ON state of the second switching element. It functions to be turned on by the charging charge of the capacitor for use.
Therefore, the intermittent wiping operation of the wiper according to the charging / discharging of the intermittent wiping mode capacitor is independently performed regardless of the state of the second switching element turned on by the timer capacitor, and the intermittent wiping cycle thereof. There is no fear of changing carelessly.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. That is, in FIG.
The wiper control device 1 includes terminals 1a to 1g, and the terminal 1a is connected to a positive side terminal of a vehicle-mounted battery 4 via a fuse 2 and an ignition switch 3. The terminal 1b is connected to the high speed rotation terminal H of the wiper motor 5, and the terminal 1c is the low speed rotation terminal L of the wiper motor 5.
Connected to. In this case, the negative terminal of the vehicle-mounted battery 4 and the common terminal C of the wiper motor 5 are connected to the ground terminal.

Further, the terminal 1d is connected to the common contact c of the well-known fixed position stop switch 6, the terminal 1e is connected to the terminal 1a through the washer pump motor 7, and the terminal 1f is connected to the ground terminal. 1 g is connected to the ground terminal via a reed switch 8 which constitutes a vehicle speed sensor of known construction.

In this case, the fixed position stop switch 6 is
When the wiper is in the standby position, the contact between the contacts (c-b) is kept in the operation stopped state and the wiper motor 5
When the wiper is moved from the standby position by being energized once, the contact (ca) is switched to an operating state in which the normally open contact a is connected to the terminal 1a and the normally closed contact is connected. b is connected to the ground terminal. Further, the reed switch 8 is configured to be turned on intermittently in a cycle according to the traveling speed of the vehicle when the vehicle is traveling.

The wiper control device 1 includes a relay 10 (corresponding to switching means in the present invention) for forming a current path for the wiper switch 9 and the wiper motor 5, and an npn type for controlling the operation of the relay 10. A transistor 11 (corresponding to the first switching element in the present invention),
Np for selectively turning off the transistor 11
An n-type transistor 12 (corresponding to the second switching element in the present invention), a timer capacitor 13 for selectively turning on the transistor 12, and a pnp-type transistor for selectively discharging the charge stored in the capacitor. 14 (corresponding to the traveling detection switch in the present invention),
An intermittent wiping mode capacitor 15, a washer switch 16, and the like, which determine the interval time in the intermittent wiping mode of the wiper, are provided.

The wiper switch 9 has a stop mode position OFF, an intermittent wiping mode position INT, a low speed wiping mode position LO (corresponding to a continuous wiping mode position in the present invention) and a high speed wiping according to the operation of an operation lever (not shown). The mode position HI can be switched to each of them. In this case, the wiper switch 9 is provided with contacts T1 to T6, and in the state where the above-mentioned respective positions are switched to OFF, INT, LO, and HI, the contact points T1 to T6 are indicated by circles in the figure. To selectively connect. When the wiper switch 9 is switched between the intermittent wiping mode position INT and the low speed wiping mode position LO, the contacts T1 and T4 are not short-circuited, as indicated by the mark X in the figure.

Further, in the wiper switch 9, a portion between the contacts T1 and T6 which are in a state of being connected to each other when operated to the low speed wiping mode position LO corresponds to a first contact circuit in the invention of claim 1, Similarly, the portion between the contacts T3 and T4 which are in the state of being connected to each other corresponds to the second contact circuit in the invention of claim 1.

A power supply line + B is connected between the contact T1 of the wiper switch 9 and the terminal 1a. The contacts T2 and T3 of the wiper switch 9 are connected to the terminals 1b and 1c, respectively, and the contact T4 is connected to the common contact c of the relay switch 10a included in the relay 10. The relay switch 10a is of a transfer type having a normally open contact a and a normally closed contact b, the normally closed contact b is directly connected to the terminal 1d, and the normally open contact a is a power line. +
It is connected to B and has a resistance of 1
7. A variable resistor 18 for adjusting the interval time in the intermittent wiping mode of the wiper and the intermittent wiping mode capacitor 15 are connected in series.

The terminal T5 of the wiper switch 9 is connected to the common connection point of the variable resistor 18 and the capacitor 15,
The terminal T6 includes a diode 19, a resistor 20, and a resistor 2 having the illustrated polarities.
1 and 22 are connected in series to the terminal 1f.

The common connection point of the resistors 21 and 22 is connected to the base of the transistor 11, and the collector of the transistor 11 is connected to the power source line + B via the exciting coil 10b of the relay 10. The emitter is connected to the terminal 1f. The transistor 11
A constant voltage diode 23 of the illustrated polarity is connected between the collector and the emitter of the transistor for overvoltage protection.

The common connection point of the resistors 20 and 21 is connected to the collector of the transistor 12 via the diode 24 having the polarity shown in the figure, and the emitter of the transistor 12 is connected to the ground terminal. . Therefore, when the transistor 12 is turned on, the base potential of the transistor 11 is dropped to the ground potential level, and the transistor 11 is forcibly turned off accordingly.

One end of the capacitor 13 is connected to a terminal 1d (normally closed contact b of the relay switch 10a) through a charging resistor 25 and a diode 26 of the illustrated polarity in series, and the other end is connected to a ground terminal. ing. A series circuit of discharging resistors 27 and 28 is connected in parallel to the capacitor 13, and a common connection point of these resistors 27 and 28 is connected to the base of the transistor 12.

Therefore, the transistor 12 is turned on during the period when the charge stored in the capacitor 13 is above a predetermined level. In this case, the charging time constant of the capacitor 13 via the resistor 25 is set to be sufficiently smaller than the discharging time constant of the capacitor 13 via the resistors 27 and 28. 1
2 is set to a value that can be kept in the ON state for a predetermined time (for example, 3 seconds).

The common connection point of the resistors 27 and 28 (the base of the transistor 12) is connected to the ground terminal via the collector and the emitter of the transistor 14. In this case, when the transistor 14 is turned on, the charge of the capacitor 13 is set to be discharged in a sufficiently short time.

The base of the transistor 14 has a resistor 2
It is connected to the ground terminal via 9 and is also connected to the output terminal 30a of the vehicle speed signal processing circuit 30.
The vehicle speed signal processing circuit 30 has the following configuration.

That is, one end of the capacitor 30b for passing the on / off signal of the reed switch 8 for the vehicle speed sensor is connected to the terminal 1 through the diode 30c having the polarity shown in the figure.
In addition to being connected to g, it is connected to the power supply line + B via the resistor 30d, and the other end is connected to the output terminal 30a via the diode 30e having the illustrated polarity and the resistor 30f in series. Further, between the anode of the diode 30e and the ground terminal, the diode 30g and the resistor 30g having the illustrated polarities are provided.
A series circuit of h is connected, and a parallel circuit of a capacitor 30i and a resistor 30j is connected between the cathode of the diode 30e and the ground terminal.

The vehicle speed signal processing circuit 3 configured as described above
In 0, when the reed switch 8 is intermittently turned on (vehicle running state), the operation of charging the capacitor 30b through the resistor 30d and the charge thereof is discharged through the diode 30c and the reed switch 8. The operations to be performed are alternately performed. Therefore, in the running state of the vehicle, the capacitor 30i is charged by the charging current intermittently flowing in the capacitor 30b, and the terminal voltage of the capacitor 30i rises.
The transistor 14 comes to be turned on.

When the reed switch 8 remains off (the vehicle is stopped), the intermittent charging / discharging operation of the capacitor 30b is stopped. Therefore, the capacitor 3
Since the charge of 0i is discharged and the terminal voltage of the capacitor 30i drops, the transistor 1
4 will be turned off.

The window washer switch 16 is
The momentary type is one in which the contacts T7 and T8 are bridged only during the operation to the ON position ON, the contact T7 is connected to the terminal 1e, and the contact T8 is connected to the terminal 1f.

The timer circuit 31 is for performing the wiping operation by the wiper for a predetermined time in conjunction with the operation of the washer pump motor 7, and is provided with a capacitor 31a as its timer element and has the following configuration. Has been done.

That is, in the timer circuit 31, the pnp type transistor 3 is provided between the power supply line + B and the terminal 1f.
A resistor 31c for charging and the capacitor 31a are connected in series between the emitter and collector of 1b, and a resistor 3
The common connection point of 1c and the capacitor 31a is connected to the base of the transistor 11 via the discharging resistor 31d. In addition, between the power supply line + B and the terminal 1e,
By connecting the resistors 31e and 31f in series,
The common connection point of e and 31f is connected to the base of the transistor 31b. In this case, the charging time constant of the capacitor 31a through the charging resistor 31c is set to a relatively small value, but the discharging time constant of the capacitor 31a through the discharging resistors 31d and 22 is a relatively large value. Is set to.

Next, of the operation of the above-mentioned structure, only the portion related to the gist of the invention of claim 1 will be described.
When the vehicle is running now, the vehicle speed signal processing circuit 30 keeps the transistor 14 in the ON state, so that the charge charged in the capacitor 13 is discharged through the resistor 27 and the transistor 14. Therefore, the transistor 12 is held in the off state, and the transistor 11 for energizing the exciting coil 10b is in a state in which it can be turned on without being affected by the state of the transistor 12.

When the wiper switch 9 is operated to the low speed wiping mode position LO in the above vehicle traveling state, the transistor 11 is driven by the base current supplied through the contacts T1 and T6 of the wiper switch 9 and the like. Turned on. Then, the exciting coil 10b of the relay 10 is energized, and the relay 10 is switched to the relay switch 10a.
The normally open side contact (c-a) of the wiper motor 5 is switched to the operating state, so that the energization path of the wiper motor 5 is set to the contact (c-a).
-A), the contact points T4 and T3 of the wiper switch 9 and the low-speed rotation terminal L of the wiper motor 5 are formed, whereby the low-speed wiping operation of the wiper is started.

At this time, during the period when the wiper switch 9 is in the low speed wiping mode position LO, the energization path via the low speed rotation terminal L of the wiper motor 5 is between the contacts (ca) of the relay switch 10a and the wiper switch 9. Since the state formed through the terminals T4 and T3 remains held,
The low speed wiping operation of the wiper is continuously performed.

When the vehicle is stopped from the state where the wiper is operated in the low speed wiping mode as described above, the transistor 14 is turned off in response to the decrease in the terminal voltage of the capacitor 30i in the vehicle speed signal processing circuit 30. It will switch to the state.

Therefore, during the period when the wiper is not in the standby position, that is, when the fixed-position stop switch 6 is operated, the timer capacitor 13 is connected to the diode between the contacts (ca) of the fixed-position stop switch 6. 26 and resistance 2
5, the charging time constant is relatively low, and the transistor 12 is turned on when the charged charge reaches a predetermined level or higher. In such an ON state of the transistor 12, the wiper returns to the standby position after that, and the contact (c
-B) is turned on, so that the charge stored in the timer capacitor 13 is held until it is discharged through the resistors 27 and 28 (the discharge time constant is relatively large). In this embodiment, it is turned on for 3 seconds. It is designed to be held in a state.

During the on period of the transistor 12 as described above, the transistor 11 is forcibly turned off. For this reason, the exciting coil 10b of the relay 10 is cut off, and the relay switch 10a returns to the initial state (operation stopped state) in which the contact between normally closed contacts (c-b) is turned on. Contact (c- on the normally open side of the relay switch 10a
The state in which the wiper motor 5 is energized through the path a) is released.

However, during the period when the wiper is not in the standby position, the energization path of the wiper motor 5 is between the contact (c-a) of the fixed position stop switch 6 and the contact (c-) of the relay switch 10a.
b) and between the contacts T4 and T3 of the wiper switch 9, and accordingly, the wiper returns to the standby position and the fixed position stop switch 6 turns on the contact (c-b). Only when the wiper motor 5 is restored
Will be cut off.

In this way, in the state where the contacts (c-b) of the fixed position stop switch 6 are turned on, as described above, the charge charged in the timer capacitor 13 is discharged through the resistors 27 and 28. Then, when the charged electric charge becomes lower than a predetermined level in response to this, the transistor 12 is returned to the off state.

Then, the compulsory off state of the transistor 11 is released and the transistor 11 is returned to the on state, so that the exciting coil 10b is energized and the relay switch 10a is contacted between the contacts (ca). Will be turned on. As a result, the energization path of the wiper motor 5 becomes
Between the contacts (ca) of the relay switch 10a, between the contacts T4 and T3 of the wiper switch 9 and the wiper motor 5 concerned.
It is re-formed through the low-speed rotation terminal L, and the wiping operation of the wiper is restarted.

After that, the energization path of the wiper motor 5 is intermittently formed in response to the charging and discharging of the timer capacitor 13 as described above, whereby the intermittent wiping operation by the wiper is performed. . That is, when the vehicle is stopped from the state where the wiper is operated in the low speed wiping mode, the wiper is automatically switched to the intermittent wiping mode. In this case, the wiper rest time is the discharge time constant of the capacitor 13. However, in this embodiment, it is set to 3 seconds.

Then, as described above, when the vehicle starts traveling from the state where the wiper is automatically switched to the intermittent wiping mode in response to the stop of the vehicle, the transistor 14
Is turned back to the on state, and the charge of the timer capacitor 13 is discharged, that is, the transistor 12 is turned off.
b The transistor 12 for turning on and off the power is not forcibly turned off by the transistor 12. Therefore, the wiper automatically returns to the state of operating in the low speed wiping mode. When the transistor 14 is in the ON state, the charging charge of the timer capacitor 13 is set to be discharged with a sufficiently short time constant. Therefore, when the traveling of the vehicle is restarted, the rewiping operation by the wiper is immediately started. Will be done.

As described above, when the vehicle is stopped from the running state, the simple stop function of automatically switching the wiper wiping mode to the intermittent wiping mode only when the wiper wiping mode is the low speed wiping mode is obtained. is there. In this case, the stalling function can be realized by combining only inexpensive discrete circuit components such as capacitors and transistors, and the manufacturing cost can be suppressed. As a result, the wiper control according to the present embodiment can be realized. Device 1
Can be easily mounted on a vehicle of a public car class.

FIG. 2 shows a second embodiment of the present invention, and only the parts different from the first embodiment will be described below. That is, in FIG. 2, the wiper switch 9'included in the wiper control device 1'has a configuration in which the contact T9 is added to the wiper switch 9 in the first embodiment, and in particular, it is switched to the low speed wiping mode position LO. In this state, the contacts T1 and T9 and the contacts T3 and T4 are bridged, and the contacts T3 and T4 and the contacts T5 and T6 are bridged in a state where the contact is switched to the intermittent wiping mode position INT. Has become. The portion between the contacts T1 and T9 corresponds to the first contact circuit in the invention of claim 2, and the contact T3
The portion between T4 corresponds to the second contact circuit and the fourth contact circuit in the invention of claim 2, and the portion between the contacts T5 and T6 corresponds to the third contact circuit in the invention of claim 2.

In the second embodiment, the contact T6 of the wiper switch 9 is connected to the terminal 1f via the diode 32, the resistor 33 and the resistor 22 having the polarities shown in series, and the common connection point of the resistors 33 and 22. Transistor 11
Connected to the base. Further, the contact T9 of the wiper switch 9 is connected to the resistors 34 and 35 and the diode 3 of the polarity shown in the figure.
6 (corresponding to the intermittent wiping mode priority circuit in the invention described in claim 2) is connected in series to the base of the transistor 11, and the common connection point of the resistors 34 and 35 is
It is connected to the collector of the transistor 12 via a diode 24 having the polarity shown.

Next, of the operation of the second embodiment configured as described above, only the portion related to the gist of the invention of claim 2 will be described. Also in the present embodiment, the point that the simple stop function of automatically switching to the intermittent wiping mode only when the wiper wiping mode is in the low speed wiping mode when the vehicle is stopped from the running state is obtained in the above-mentioned point. This is the same as in the first embodiment.

On the other hand, the wiper switch 9'is in the off position OF.
If in F, intermittent wiping mode capacitor 15
Is charged in the positive direction (direction of arrow A) from the power supply line + B through the resistor 17, the variable resistor 18, and the contact (c-b) of the fixed position stop switch 6. From this state, when the wiper switch 9'is operated to the intermittent wiping mode position INT, the intermittent wiping mode capacitor 15
Is charged by the contact point T5.T of the wiper switch 9 '.
During this period, the transistor 11 is turned on in response to being discharged through the diode 32, the resistors 33 and 22 during the period 6, and the exciting coil 1 of the relay 10 is turned on in response to the turning on.
0b is energized.

As a result, the contact point (ca) of the relay switch 10a is turned on, so that the contact point (ca).
During this period, an energization path of the wiper motor 5 is formed through the contacts T4 and T3 of the wiper switch 9 ', and the wiper wiping operation is started.

When the wiper wiping operation is started in this way, the fixed position stop switch 6 is switched to the operating state in which the contact points (ca) are turned on. Therefore, the charge of the intermittent wiping mode capacitor 15 is discharged through the contacts (c-a) of the fixed position stop switch 6 and the like, but the on state of the transistor 11 is the resistor 17, the variable resistor 18, and the wiper. Since it is maintained as it is through the diode 32, the resistor 33, etc. between the contacts T5 and T6 of the switch 9 ', the power supply to the wiper motor 5 is continued.

The wiper is returned to the standby position in response to the continuation of the energization, and the fixed position stop switch 6 contacts the contact (c).
-When the state between b) is turned on, the intermittent wiping mode capacitor 15 is recharged via the resistor 17 and the variable resistor 18. In this way, the charging of the 6 intermittent wiping mode capacitor 15 is started at the moment when the wiper returns to the standby position.
Since the base potential of No. 1 is lowered and the transistor 11 is turned off, the relay switch 10a returns to the state in which the contact point (c-b) is turned on in response to the power interruption of the exciting coil 10. The wiper motor will be cut off.

When the fixed position stop switch 6 returns to the state in which the contacts (c-b) are turned on as described above, the intermittent wiping mode capacitor 15 is recharged in the positive direction for a predetermined time. When (the time corresponding to the charging time constant through the resistor 17 and the variable resistor 18) elapses and the charging level of the capacitor 15 becomes equal to or higher than a predetermined level, the transistor 11 is charged by the charge of the intermittent wiping mode capacitor 15. Will be turned on again. Therefore, thereafter, the energization path of the wiper motor 5 is intermittently formed according to the charging and discharging of the intermittent wiping mode capacitor 15 as described above, and thus the intermittent wiping operation by the wiper is performed. .

In this case, when the wiper switch 9'is operated to the intermittent wiping mode position INT, the diode 3
Reference numeral 6 serves to prevent the electric charge charged in the intermittent wiping mode capacitor 15 from being discharged through the transistor 12. That is, the diode 36 is connected to the exciting coil 1
Transistor 11 provided for disconnecting 0b
Irrespective of the on-state of the transistor 12 provided for the stop function, it is turned on by the charge of the intermittent wiping mode capacitor 15. Therefore, the intermittent wiping operation of the wiper according to the charging / discharging of the intermittent wiping mode capacitor 15 is performed independently of the state of the transistor 12 turned on by the timer capacitor 13.

In short, according to the present embodiment, the same effect as that of the first embodiment is obtained, and the wiper switch 9'is provided.
Thus, in the state where the intermittent wiping mode is selected, the effect that the intermittent wiping cycle of the wiper is prevented from changing carelessly due to the existence of the stop function is obtained.

In each of the above embodiments, a mechanical relay is used as the switching means, but other switching means such as an electronic relay may be used.

[0074]

As is clear from the above description, according to the invention described in claim 1, the simple stop function is realized by using only the discrete circuit component, so that it can be manufactured at a low cost. As a result, it is possible to obtain the beneficial effect that it can be easily mounted on a vehicle of a popular car class.

According to the second aspect of the invention, in addition to the above effects, when the wiper is operated in the intermittent wiping mode, a situation in which the intermittent wiping cycle fluctuates inadvertently occurs. The excellent effect of being able to prevent it can be exhibited.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

In the drawing, 1 and 1'are wiper control devices, 3 are ignition switches, 4 are in-vehicle batteries, 5 are wiper motors, 6
Is a fixed position stop switch, 9 and 9'are wiper switches, 1
0 is a relay (switching means), 11 is a transistor (first switching element), 12 is a transistor (second switching element), 13 is a timer capacitor,
14 is a transistor (travel detection switch), 15 is a capacitor for intermittent wiping mode, 16 is a washer switch,
Reference numeral 30 is a vehicle speed signal processing circuit, 31 is a timer circuit, and 36 is a diode (intermittent wiping mode priority circuit).

Claims (2)

[Claims] 1. A wiper for controlling a wiper which is operated only after the wiper wipe operation is started and before the wiper returns to a standby position, and which is provided with a fixed position stop switch for holding the energized path forming state of the wiper motor. In the above vehicle wiper control device, a switching means having a normally open contact that is turned on in an operating state, a first switching element that switches the switching means to an operating state when turned on, and a continuous wiping mode position Second contact forming a current path of the wiper motor through a first contact circuit for turning on the first switching element in a closed state, and a normally open contact of the switching means switched to an operating state in response to the turning on. A wiper switch having a circuit, and through the fixed position stop switch during the period when the fixed position stop switch is operated. A timer capacitor that is charged and discharges with a predetermined time constant during the operation stop time of the fixed-position stop switch, and a timer capacitor that is provided so as to turn on during a period when the charge of the timer capacitor is equal to or higher than a predetermined level. A second switching element for forcibly turning off the first switching element in an on state; and a second switching element provided so as to be in an on state in a traveling state of the vehicle, and in the on state, discharges an electric charge charged in the timer capacitor A wiper control device for a vehicle, comprising: a travel detection switch connected as described above. 2. A wiper for controlling a wiper, which is operated only after the wiper wipe operation is started and before the wiper returns to the standby position, and which is provided with a fixed position stop switch for holding the energized path forming state of the wiper motor. In the vehicle wiper control device, the switching means having a normally open contact that is turned on in an operating state, a first switching element that switches the switching means to an operating state when turned on, and the fixed position stop switch are provided. While being charged in the positive direction through the fixed position stop switch during the period when the operation is stopped,
A capacitor for intermittent wiping mode that performs a discharging operation during a period when the fixed position stop switch is operated, a first contact circuit that turns on the first switching element in the state where the switch is moved to the continuous wiping mode position, and its on The capacitor for the intermittent wiping mode has a second contact circuit that forms an energization path of the wiper motor through a normally open contact of the switching means that is switched to an operating state according to the operation state, and is operated to the intermittent wiping mode position in the state of being operated. Forming a conduction path of the wiper motor through a third contact circuit for turning on the first switching element on the basis of the electric charge of the wiper motor and a normally-open contact of the switching means which is switched to an operating state in response to the turning on. A wiper switch having a four-contact circuit, and the fixed position stop switch during the period when the fixed position stop switch is operated. And a timer capacitor that discharges with a predetermined time constant during the operation stop period of the fixed-position stop switch, and is turned on during the period when the charge of the timer capacitor is above a predetermined level. A second switching element that is forcibly turned off the first switching element in the ON state and a second switching element that is turned on in the running state of the vehicle. In a state where the running detection switch connected to discharge the charged electric charge and the wiper switch are operated to the intermittent wiping mode position, the first switching element is operated regardless of the ON state of the second switching element. An intermittent wiping mode priority circuit that functions to turn on by the charge of the intermittent wiping mode capacitor is provided. A wiper control device for a vehicle.