JPH0510134U - Wiper drive circuit - Google Patents

Abstract

(57) [Summary] [Purpose] In the case of a second floor vehicle or a high floor vehicle in which wipers 14 and 13 are attached to the upper and lower windshields 12 and 11, respectively, when the door for entry and exit is opened , Interlocking switch 27 of upper and lower wipers 14 and 13
It is an object of the present invention to provide a wiper drive circuit that stops the operation of the wiper 14 of the upper windshield 12 even when the power is turned on. [Configuration] Door switch 30 that switches according to opening / closing of the door
Is provided, and when the door is opened, the changeover switch 27
The power supply to the drive circuit 24 of the wiper 14 of the upper window glass 12 is cut off by this so that the wiper 14 of the upper window glass 12 does not operate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper drive circuit, and more particularly to a wiper drive circuit for driving wipers provided on upper and lower windshields of a second floor vehicle or a high floor vehicle, respectively.

[0002]

[Prior Art]

 For vehicles such as the second-floor bus or super high-floor bus, which have a significantly higher passenger's viewpoint than the driver's viewpoint, a windshield wiper is also provided on the upper windshield to ensure the passenger's visibility in rainy weather. I am trying.

Such an upper windshield wiper is connected to a mode changeover switch arranged in the driver's seat together with the wiper provided on the windshield in front of the driver's seat. The upper and lower wipers are operated together by switching. Furthermore, if necessary, by providing an interlocking switch between the mode changeover switch and the drive circuit of the upper windshield wiper, the interlocking switch with the lower windshield wiper and the upper windshield wiper can be linked. It becomes possible to select stop and stop.

[0004]

[Problems to be solved by the device]

 In such vehicles, during normal driving and when passengers are on board, the windshield wiper on the upper side and the windshield wiper on the lower side are linked so that the driver can operate them together. It doesn't matter what you do. However, if the windshield wiper on the upper side is left activated when passengers and passengers get on and off, there is a problem that rainwater and snow wiped off by the upper wiper will fall on passengers and crew.

The present invention has been made in view of the above problems, and normally, the windshield wiper on the upper side is interlocked with the windshield wiper on the lower side, and the door is opened to open passengers and crew members. It is an object of the present invention to provide a wiper drive circuit that prevents rainwater and snow wiped by the windshield wiper on the upper side from falling on passengers and crew when the passengers get on and off.

[0006]

[Means for Solving the Problems]

 The present invention attaches wipers to the upper and lower windshields of a second-floor vehicle or a high-floor vehicle, and connects a mode changeover switch to the drive circuit of the windshield wiper on the lower side. The upper windshield wiper drive circuit is connected to the upper windshield wiper drive circuit, and a door switch is connected between the upper windshield wiper drive circuit and the power supply. The power supply to the upper windshield wiper drive circuit is cut off.

[0007]

[Action]

 Therefore, when the door is opened, the power supply to the drive circuit of the upper windshield wiper is cut off, and even if the interlock switch is turned on, the upper windshield wiper stops its operation. Will be done.

[0008]

【Example】

 FIG. 2 shows a second-floor bus equipped with a wiper drive circuit according to an embodiment of the present invention. The second-floor bus is located on the front side of the vehicle body and in front of the driver's seat. 11 is provided, and a windshield 12 on the second floor is provided above it. Wipers 13 and 14 are attached to the windshields 11 and 12, respectively. The windshield 11 on the first floor is wiped with two wipers 13, while the front glass 12 on the second floor is wiped with one wiper 14. The wipers 13 and 14 are configured to swing by motors 15 and 16, respectively. The motors 15 and 16 are driven by a power source from a battery 17.

FIG. 1 shows an overall block diagram of a wiper drive circuit for driving these two types of wipers 13 and 14. A battery 17 is connected to a mode changeover switch 21 via a key switch 20. It has become so. The contact of each mode of the mode changeover switch 21 is connected to the wiper motor drive circuit 23 on the first floor and the wiper motor drive circuit 24 on the second floor. A pair of diodes 25 and 26 and an interlock switch 27 are connected between the mode changeover switch 21 and the wiper motor drive circuit 24 on the second floor.

A door switch 30 is connected between the wiper motor drive circuit 24 on the second floor and the power source to open and close in conjunction with opening and closing of a door for getting on and off the vehicle body. A relay 31 is further connected to the switch 30, and the relay 31 opens and closes a contact 32 connected to the power line of the wiper motor drive circuit 24 on the second floor.

A washer switch 33 is laid on the mode changeover switch 21, and the washer motor 34 on the first floor is directly controlled by the switch 33. Further, a relay 35 is connected in parallel with the motor 34, and the relay 35 switches the contact 36. The contact 36 controls the supply of power to the washer motor 37 on the second floor.

Next, a specific configuration of the wiper motor drive circuit 23 on the first floor will be described with reference to FIG. This drive circuit includes a first relay unit 41 and a second relay unit 42. The first relay unit 41 is provided with transistors 43 and 44, and relay 45 is connected so as to be controlled by the transistor 44. The relay 45 controls switching of the contact 46. A transistor 47 is connected so as to short-circuit the base current of the transistor 43.

Next, the transistor 50 is connected to the second relay unit 42, and the relay 51 is connected in series with the transistor 50. The relay 51 controls opening and closing of the contact point 52. The other relay 53 of this unit 42 is adapted to switch the contact 54. The high-speed side terminal 55 and the low-speed side terminal 56 of the motor 15 are switched according to the switching of the contact 54. A cam switch 57 is connected to the ground side of the motor 15.

Next, the configuration of the wiper motor drive circuit 24 on the second floor will be described with reference to FIG. This circuit is substantially the same as that of FIG. 3 and includes a first relay unit 81 and a second relay unit 82. Transistors 83 and 84 and a relay 85 are connected in the first unit 81 as shown in the figure. The relay 85 controls the opening and closing of the contact 86. The transistor 87 is connected to the base of the transistor 83.

The second relay unit 82 includes a transistor 90 and a relay 91 controlled by the transistor 90, and the relay 91 switches the contact 92. Further, the second unit 82 is provided with a relay 93 to switch the contact point 94. By switching the contact point 94, the high speed side terminal 95 and the low speed side terminal 96 of the motor 16 are switched. Furthermore, a cam switch 97 is connected to the motor 16.

Next, the operation of the drive circuit for the wiper according to the above configuration will be described. When the mode selector switch 21 is OFF, the relays 45, 51 and 53 shown in FIG. 3 are both deenergized, and the contacts 46, 52 and 54 are all switched to the right side. Further, since the wiper 13 driven by the motor 15 is in the storage position, the cam switch 57 is switched to the left side.

Therefore, the low-speed side terminal 56, the terminal 73, the contact point 54, the contact point 52, the terminal 68, the terminal 66, the contact point 46, the terminal 62, the cam switch 57, and the closed circuit of the motor 15 of the motor 15 are formed. Moreover, since this closed circuit is disconnected from the battery 17 constituting the power supply, the motor 15 is not driven to rotate, and the wiper 13 of the windshield 11 on the first floor is stopped at the storage position.

In this state, when the mode switch 21 is switched to the intermittent position as shown in FIG. 4, a current flows from the battery 17 to the base of the transistor 43 through the key switch 20, the mode switch 21, and the terminal 64. Flowing, the emitter current of this transistor 43 is supplied to the base of transistor 44. Therefore, the transistor 44 is turned on. Since the transistor 44 is connected in series with the relay 45, the relay 45 is excited. Then, a current flows from the battery 17 through the terminal 61 in the order of the relay 45, the transistor 44, the terminal 65, and the ground. Then, the contact 45 is switched to the left by the relay 45. Then, a current flows through the contact 46 in the order of the terminal 66, the terminal 68, the contact 52, the contact 54, the terminal 73, and the low speed side terminal 56 of the motor 15, so that the motor 15 is driven at a low speed.

In the state shown in FIG. 4, when the motor 15 starts swinging the wiper 13 on the first floor, the cam switch 57 is switched to the right side as shown in FIG. 5 in conjunction with this swinging motion. At this time, a current is flowing to the base of the transistor 44 through the mode changeover switch 21 and the transistor 43. When the cam switch 57 is switched to the right by the swing motion of the wiper 13 as described above, a current flows from the battery 17 to the base of the transistor 47 through the key switch 20, the cam switch 57, and the terminal 62, and the transistor 47 is turned on. Turns on.

Then, the base current of the transistor 43 is short-circuited by the transistor 47, and the transistors 43 and 44 both turn off. This deactivates the relay 45 and switches the contact 46 to the right. In this way, a circuit as shown in FIG. 5 is formed. That is, the current from the battery 17 is supplied to the low speed side terminal 56 of the motor 15 through the cam switch 57, the terminal 62, the contact 46, the terminal 66, the terminal 68, the contact 52, the contact 54, and the terminal 73. Is driven at a low speed.

Therefore, when the wiper 13 is swung by the motor 15 and rotated to the stored position after this, the cam switch 57 is switched to the left side opposite to the right side position shown in FIG. The switch 57 is turned off. As a result, the power supply circuit of the motor 15 is cut off and the motor 15 is stopped.

In this state, the transistor 47 maintains the ON state due to the discharging current of the capacitor 48. Then, after a fixed time, for example, 5 seconds, when the capacitor 48 finishes discharging, the transistor 47 turns off. Then, the current is again supplied to the base of the transistor 43 through the mode switching switch 21, and the state shown in FIG. 4 is restored. As a result, the motor 15 causes the wiper 13 to oscillate again. As described above, in the intermittent mode, the wiper 13 is intermittently driven at each time determined by the time constant of discharging the capacitor 48.

In such an intermittent mode, when the mode changeover switch 21 is turned off, the supply of the base current from the mode changeover switch 21 to the transistor 43 is cut off. Therefore, the cam switch 57 is switched to the left side, and when the capacitor 48 has finished discharging, the stop mode shown in FIG. 3 is entered and the motor 15 is stopped.

Next, when the mode selector switch 21 is switched to the low speed side, a current flows from the terminal 70 to the base of the transistor 50 of the second relay unit 42 through the mode selector switch 21, as shown in FIG. 50 turns on. Then, the relay 51 connected in series with the transistor 50 is excited, and the contact 52 is switched to the left side. Then, power is supplied from the battery 17 to the motor 15 through the key switch 20, the terminal 67, the contact 52, the contact 54, the terminal 73, and the low speed side terminal 56, and the motor 15 is driven at a low speed.

In such a low speed mode, when the mode switch 21 is turned off, the transistor 50 is turned off, the relay 51 is deenergized, and the contact 52 is switched to the right side.

At this time, when the wiper 13 is not in the storage position, the circuit shown in FIG. 5 is formed, and the battery 17 is switched to the key switch 20, the cam switch 57, the terminal 62, the contact 46, the terminal 46. A current flows in the order of 66, the terminal 68, the contact 52, the contact 54, the terminal 73 and the low speed side terminal 56, and the motor 15 rotates the wiper 13 at a low speed to the storage position. Then, when the wiper 13 is rotated to the storage position, the cam switch 57 is switched to the left side, so that the state shown in FIG. 3 is established, and the motor 15 is stopped in the state of being cut off from the power source. That is, when the wiper 13 is not in the storage position, the wiper 13 is rotated to the storage position as shown in FIG. 3, whereby the motor 15 is stopped.

Next, the high speed mode will be described with reference to FIG. When the mode selector switch 21 is switched to the high speed side, a current flows from the selector switch 21 through the terminal 70 to the base of the transistor 50 of the second relay unit 42, and the transistor 50 is turned on. Then, the relay 51 is excited and the contact 52 is switched to the left side. At the same time, a current directly flows from the mode changeover switch 21 to the relay 53 through the terminal 69, and the relay 53 is excited. Then, the contact 54 is switched to the left side.

Therefore, the current from the battery 17 is supplied to the motor 15 through the key switch 20, the terminal 67, the contact 52, the contact 54, the terminal 72, and the high speed side terminal 55, and the motor 15 operates at high speed. It will be driven to rotate.

The state in which the motor 15 is rotationally driven at a high speed is continued until the relay switch 21 becomes OFF. Then, when the relay switch 21 is turned off, it becomes as shown in FIG. That is, both the relay 51 and the relay 53 are deenergized, whereby the contacts 52 and 54 are respectively switched to the right side. Moreover, at this time, when the wiper 13 is not in the storage position, the cam switch 57 is in the state of being switched to the right.

Therefore, as shown in FIG. 5, a current flows to the motor 15 through the cam switch 57, the terminal 62, the contact point 46, the terminal 66, the terminal 68, the contact point 52, the contact point 54, the terminal 73, and the low speed side terminal 56. The motor 15 rotates the wiper 13 at a low speed to the storage position. Then, at this position, the wiper 13 switches the cam switch 57 to the left side to cut off the power supply circuit. As a result, the state shown in FIG. 3 is reached and the motor 15 is stopped.

Next, driving of the washer motor 34 shown in FIG. 3 will be described. When the washer switch 33 provided on the mode changeover switch 21 is turned on, the motor 34 is rotated. Then, the cleaning liquid is sprayed onto the lower windshield 11 by the motor 34.

Moreover, at this time, a current flows from the terminal 63 to the capacitor 49 through the washer switch 33 of the mode changeover switch 21 to charge the capacitor 49. Then, after a predetermined time, for example, 0.5 seconds, a current flows through the base of the transistor 43 due to the charging voltage of the capacitor 49, so that the transistor 43 is turned on, and the transistor 44 is turned on. Therefore, the state becomes almost the same as that shown in FIG. 4, the contact 46 is switched to the left side by the relay 45, and the motor 15 is driven at a low speed. Moreover, in this state, even if the cam switch 57 is switched to the right side, the line between the terminal 63 and the base of the transistor 43 is not short-circuited, and the motor 15 is driven at a low speed.

When the switch 33 is turned off, the transistor 43 remains on for the time constant set by the capacitor 49. Since this time is almost equivalent to the time when the wiper 13 is wiped three times, the wiper 13 stops after swinging three times. Even when the capacitor 49 is discharged during the stop, power is continuously supplied to the motor 15 until the cam switch 57 is switched to the stop side (left side) as in the case of the intermittent drive. This causes the wiper 13 to stop at the storage position.

Next, the drive circuit for the wiper 14 provided on the windshield 12 on the second floor will be described with reference to FIG. FIG. 8 shows a state in which the mode changeover switch 21 is turned off, and the drive motor 16 of the upper wiper 14 is connected to the closed circuit in a state of being disconnected from the power source.

The drive circuit of this motor is provided with two units 81 and 82, and is almost the same as the drive circuit of the lower wiper 13 described above, and the operation is also the same. That is, when the mode switching switch 21 is OFF, the motor 16 is stopped as shown in FIG. On the other hand, when the mode selector switch 21 is switched to the intermittent mode, the motor 16 is driven intermittently. When the mode selector switch 21 is switched to the low speed side, the motor 16 is driven at a low speed.

However, this drive circuit is not connected to the high-speed side terminal of the mode changeover switch 21. That is, even if the mode changeover switch 21 is switched to the high speed side, it is driven only by the signal from the low speed side terminal, so that the state becomes the same as that shown in FIG. 6, whereby the motor 16 is driven at the low speed. Like That is, when the mode selector switch 21 is switched to the high speed side, the wiper 13 of the windshield 11 on the first floor is driven at high speed, but the wiper 14 of the windshield 12 on the second floor is driven at low speed. Become.

Next, when the interlocking changeover switch 27 is opened, the power supply circuit of the relay 31 is cut off. That is, the relay 31 is deenergized and the contact 32 is opened. Since the contact 32 is connected to the power supply line of the drive circuit of the upper wiper 14, the power is not supplied and the motor 16 of the upper wiper 14 is stopped.

Further, in this wiper drive circuit, as shown in FIGS. 1 and 8, a door switch 30 is connected to the power supply line to the wiper motor drive circuit 24 on the second floor. As shown in Fig. 2, the door switch 30 is arranged inside the door on the left side in front of the vehicle, detects the opening / closing of the door, and detects when the door is opened. Is designed so that the switch 30 is turned off.

Therefore, according to such a wiper drive circuit, when the door is opened and the door switch 30 is opened in conjunction with this, the power is supplied to the wiper motor drive circuit 24 on the second floor. Will be cut off, which will stop the drive motor 16 of the wiper 14 on the second floor.

Therefore, even if the interlock switch 27 is still turned on, the wiper 14 of the upper window glass 12 does not operate, and the wiper 14 is wiped off to the passengers and crews who open and close the door. Rainwater and snow will not fall. Further, the driver does not need to perform an operation for stopping the upper wiper 14 when the door is opened, which can reduce the burden on the driver.

[0041]

[Effect of the device]

 As described above, the present invention cuts off the power supply to the drive circuit of the windshield wiper on the upper side when the door is opened. Therefore, as long as the door is open, even if the interlock switch is ON, the power supply to the upper windshield wiper is cut off, causing the upper windshield wiper to not operate and There is no longer any chance of rainwater, snow, etc. adhering to the upper windshield falling on passengers and people nearby.

[Brief description of drawings]

FIG. 1 is a block diagram of a wiper drive circuit.

FIG. 2 is an external perspective view of a bus including this drive circuit.

FIG. 3 is a circuit diagram of a drive circuit in a stop mode.

FIG. 4 is a circuit diagram of an intermittent mode drive circuit.

FIG. 5 is a circuit diagram showing a state in which a wiper is moved to a storage position in an intermittent mode.

FIG. 6 is a circuit diagram of a drive circuit in a low speed mode.

FIG. 7 is a circuit diagram of a drive circuit in a high speed mode.

FIG. 8 is a circuit diagram of an upper wiper drive circuit.

[Explanation of symbols]

 11 Windshield on 1st floor 12 Windshield on 2nd floor 13 Wiper (1st floor) 14 Wiper (2nd floor) 15 Motor (1st floor) 16 Motor (2nd floor) 17 Battery 20 Key switch 21 Mode change switch 23 Motor drive circuit ( 1st floor 24 Motor drive circuit (2nd floor) 25, 26 Diode 27 Interlock switch 30 Door switch 31 Relay 32 contacts 33 Washer switch 34 Washer motor (1st floor) 35 Relay 36 Washer motor (2nd floor) 41 Relay unit ( 1st) 42 relay unit (2nd) 43,44 transistor 45 relay 46 contact 47 transistor 48,49 capacitor 50 transistor 51 relay 52 contact 53 relay 54 contact 55 high speed side terminal 56 low speed side terminal 57 cam switch 61 73 terminal 81 relay unit (first) 82 relay unit (second) 83, 84 transistor 85 relay 86 contact 87 transistor 88, 89 capacitor 90 transistor 91 relay 92 contact 93 relay 94 contact 95 high speed side terminal 96 low speed side terminal 97 cam Switches 101 to 113 terminals

Claims (1)

[Claims for utility model registration] 1. Wipers are attached to the upper and lower windshields of a second-floor vehicle or a high-floor vehicle, and a mode selector switch is connected to the drive circuit of the lower windshield wiper. The mode changeover switch is connected to the upper windshield wiper drive circuit via the interlocking switch, and further, it is switched between the upper windshield wiper drive circuit and the power source according to opening / closing of the door. A drive circuit for a wiper, characterized in that a door switch is connected so that when the door is opened, power supply to the drive circuit for the upper windshield wiper is cut off.