JPH0549502B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a defogging control device for vehicle window glass, and particularly to a defogging control device for vehicle window glass that uses the operating mode of a wiper as a control factor. Regarding.

[Conventional technology]

Generally, when driving a vehicle, it is a common experience that rain, snowfall, etc. cause fogging on the windshield, rear glass, etc., which hinders driving. In such a case, the driver operates the wipers and often performs various operations to remove fog, such as introducing outside air, turning on the air conditioner, and switching the air outlet. These operations are not only complicated in themselves, but also cause a burden on the operator because they are performed while the vehicle is running.

In order to solve this problem, it has been proposed to automatically perform a defrosting operation (hereinafter simply referred to as a "defrosting operation") in conjunction with turning on a wiper switch or the like.

For example, in the device described in Japanese Patent Application Laid-Open No. 58-174017, a demist switch consisting of a plurality of switches is provided in a vehicle air conditioner, and the demist switch, a wiper operation switch, and a rear heat ray control switch are connected to each other. A method has been disclosed in which the air conditioner is activated when any one of the air conditioners is turned on, and this method has achieved some results in terms of reducing the operational burden mentioned above.

[Problem that the invention seeks to solve]

However, in the conventional example described above, there is an inconvenience in that the defrost operation is performed even when the wipers are operated simply to remove dirt from the window glass, and the defrost operation also simply depends on whether the wipers are operated or not. As a result, even though the window glass is not foggy, the cabin air is heated and dehumidified more than necessary, causing unnecessary fluctuations in the air conditioning condition inside the cabin, and conversely causing fogging. There were inconveniences such as removal not being carried out effectively.

The present invention improves the disadvantages of the conventional example, and particularly provides a vehicle window glass defogging control device that can indirectly detect the degree of fogging of the window glass using the operating mode of the wiper and effectively perform defogging control. Its purpose is to.

[Means for solving problems]

In the present invention, the wiper operation mode selection means selects one of a plurality of operation modes such as intermittent, low speed, or high speed for the wiper, and when the wiper operation mode selection means selects one of the operation modes, In a vehicle air conditioning control device, the control circuit is equipped with a control circuit that instructs each corresponding drive circuit to start a separately installed air conditioner, switch an inside/outside air switching damper to the outside air side, etc. It has an air volume/temperature variable setting function that appropriately variably sets the rotational speed of the blower and the opening/closing position of the temperature control damper in accordance with each of the plurality of wiper operation modes selected by the selection means. The wiper operation mode selection means has a washing water injection mode selection function for selecting a washing water injection mode that the wiper has in advance, and is activated when the wiper operation mode selection means selects the washing water injection mode. The control circuit is configured to have a dehumidification mode release function that stops the operation of the air conditioner and the switching operation of the inside/outside air switching damper to the outside air side. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The embodiment shown in FIG. 1 includes a front wiper operation mode selection switch 1 as a wiper operation mode selection means for selecting one of a plurality of operation modes such as intermittent, low speed, or high speed for the wiper, and a front wiper operation When the mode selection switch 1 selects one of the operating modes, commands are given to the corresponding drive circuits 12 and 13 to start the separately installed air conditioner 8, switch the inside/outside air switching damper 9 to the outside air side, etc. A control circuit 7 is provided.

The control circuit 7 is an air volume/temperature variable controller that appropriately variably sets the rotational speed of the blower 10 and the opening/closing position of the temperature control damper 11 in accordance with each of the plurality of wiper operation modes selected by the front wiper operation mode selection switch 1. It has a setting function.
Further, the aforementioned front wiper operation mode selection switch 1 has a washing water injection mode selection function for selecting a washing water injection mode that the wiper is provided with in advance. Furthermore, the control circuit 7 operates when the front wiper operation mode selection switch 1 selects the cleaning water injection mode, and cancels the dehumidification mode to stop the operation of the air conditioner 8 and the operation of switching the inside/outside air switching damper 9 to the outside air side. It has functions.

To explain this in more detail, in FIG. 1, the front wiper operation mode selection switch 1 has contacts W, I,
It is equipped with L and H. Reference numeral 2 is a front wiper motor control circuit, and the contacts W, I, L,
The rotational speed of the front wiper motor 3 is set to each of low speed, intermittent, low speed, and high speed in response to the opening and closing of H.

A washing water pump motor control circuit with reference numeral 4 is shown.
The wash water pump motor control circuit 4 has a function of driving the wash water pump motor 5 for a certain period of time in response to the opening and closing of the contacts W. Further, reference numeral 7 indicates a control circuit consisting of a 1-chip microprocessor or the like.
This control circuit 7 has a function of switching the operation mode of each device used for defrosting operation in response to the opening and closing of contacts W, I, L, and H. That is, the control circuit 7 functions to control the operations of the air conditioner 8, the internal/external air switching damper 9, the blower 10, and the mixing damper 11 for adjusting the temperature of the blown air during the defrosting operation.

Reference numeral 12 denotes a relay for driving the air conditioner 8, one end of which is connected to the battery, and the other end connected to the output terminal of the control circuit 7. 13 is an internal/external air switching damper drive circuit, 14 is a blower drive circuit,
Reference numeral 15 denotes a temperature adjustment damper drive circuit, which drives the above-mentioned inside/outside air switching damper 9, blower 10, or mixing damper 11, respectively, according to control signals supplied from the control circuit 7.

Next, the overall operation of this embodiment is shown in FIG.

First, in step S1, the state of the wiper operation mode selection switch 1 is read into the internal memory included in the control circuit 7. Next, in step S2, it is checked whether the contact W is closed, that is, whether the cleaning water injection mode is selected. If the result of this check is YES, the process advances to step S3 and a control signal is supplied to the wash water pump motor control circuit 4. In response to this signal, the control circuit 4 drives the pump motor 5 for a predetermined period of time, and the wash water pump injects a predetermined amount of washing liquid onto the outer surface of the windshield.

Next, the process advances to step S4, where the front wiper motor control circuit 2 is commanded to rotate at a low speed, and the circuit 2 drives the front wiper motor 3 at a low speed. Next, the process proceeds to step S5, where a timer for a predetermined time is activated. When this predetermined time has elapsed, the process proceeds to step S6, where a wiper stop signal is supplied to the front wiper motor control circuit 2, and the operation of the front wiper is stopped.

On the other hand, if the check result in step S2 is NO, the process proceeds to step S7, where it is checked whether the contact I is closed, that is, the intermittent sweep mode of the front wiper is selected. If the answer is yes at this time, the process first proceeds to step S8, where device operation mode 0 is set. This mode 0 means that the air conditioner 8 is instructed to operate under conditions suitable for dehumidification, the relay 12 is energized to start the dehumidification operation, and a control signal is supplied to the inside/outside air switching damper drive circuit 13 to This means setting the air switching damper 9 to the outside air introduction side.

Next, the process advances to step S9, where device operation mode 1 is set. Mode 1 means that a predetermined control signal is sent to the blower drive circuit 14 to cause the blower 10 to rotate at a low speed, and a predetermined signal is also sent to the temperature control damper drive circuit 15 to relatively control the outlet air temperature of the mixing damper 11. This means setting it low. When the wipers are in intermittent operation, there is relatively little fogging, so the speed and temperature of the defrosting air are set low.

Next, if the answer is no in step S7, the process advances to step S10, where it is checked whether the contact L is closed or not. If the answer is yes, step
The same device operation mode 0 as S8 is set. Next, the process advances to step S12, where device operation mode 2 is set. This operation mode 2 is similar to operation mode 1 in step S10, but in this mode, the blower 10 is rotated at a medium speed and the outlet temperature of the mixing damper 11 is set at a medium speed. When the wipers are operated at a low speed, it is likely that fogging will occur to some extent, so the defrost operation will also be performed at a moderate level.

Finally, if the answer is no in step S10, the process advances to step S14, where it is checked whether the contact H is closed or not. If the answer is yes, then
Proceeding to step S14, the device operation mode 0, which is the same as step S8, is set. Next, the process advances to step S15, where device operation mode 3 is set. This mode 3
is the same as operation mode 1 in step S9, but
In this case, the blower 10 is set to rotate at a high speed and the outlet temperature of the mixing damper 11 is set to be high. When the wipers are driven at high speed, more fogging is expected than in the previous two situations, so the defrost operation is made to be stronger to some extent.

Note that if the determination in step S13 is NO or if each of the above-mentioned processes has been completed, the process proceeds to step S1.
Return to

That is, since the fogging of the window glass generally becomes more severe as the rain or snow becomes stronger, the sweep speed of the wiper is also set to be faster according to the intensity of the rain or snow. Therefore, automatic controls are carried out in response to the wiper sweep speed, such as increasing the amount of air blown onto the inner surface of the window glass, raising its temperature, and increasing the dehumidification effect.

Therefore, in this embodiment, unlike the conventional case where intermittent on/off control is performed regardless of the degree of fogging of the window glass, the degree of fogging is classified in stages based on the wiper operating mode. , it is now possible to perform precise and fine-grained control and improve the defrosting effect. Also,
When the wipers are operated in conjunction with the washer fluid, unnecessary defrosting operation is not performed simply to remove dirt from the window glass, so accurate control is achieved from this point of view as well, and it also saves energy. It's summery.

Next, a modification of the above embodiment will be shown.

This modification is for controlling the energization of the hot wire on the rear glass according to the operation of the rear wiper.
An example of the circuit configuration is shown in FIG. Here, it is assumed that the operation mode of the rear wiper is only on and off operations. In FIG. 3, reference numeral 21 is a rear glass heating wire switch, and reference numeral 22 is a rear wiper switch, each of which has one end grounded and the other end connected to a NOR circuit 23. Note that the other end of the rear wiper switch 22 is also connected to a rear wiper motor drive circuit 24. A rear wiper motor 25 is driven by a drive circuit 24.

An inverter 26 amplifies and inverts the output signal of the NOR circuit 23. Reference numeral 27 is an energization control circuit;
While the input terminal is set to low level, timer 2
Grounding and opening of the output terminal O are repeated at time intervals determined by 8. Reference numeral 29 denotes a hot wire for heating the rear glass, one end of which is connected to the output terminal O of the energization control circuit 27, and the other end connected to the battery.

Therefore, in the circuit configuration shown in FIG.
When the rear wiper switch 22 is turned on, the input terminal of the rear wiper motor drive circuit 24 becomes a low level, and the circuit 24 drives the rear wiper motor 25 while the input terminal is at a low level. Further, as a result of one of the input terminals of the NOR circuit 23 becoming low level, the output becomes high level, this is inverted by the inverter 26, and a low level signal is supplied to the input terminal I of the energization control circuit 27. In accordance with this signal input, the energization control circuit 27 intermittently energizes the rear glass heating wire 29 in accordance with the operating procedure shown in FIG.

That is, the operation of the rear wiper switch 22 is constantly monitored in step S21, and when the rear wiper switch is turned on and the input terminal I of the energization control circuit 27 becomes low level, the program exits from the standby loop of step S21 and proceeds to the next step S22. Proceed to. Here, the output terminal O of the energization control circuit 27 is grounded, and current flows from the battery to the rear glass heating wire 29. Next, the process advances to step S23, where the loop operation continues for the time set in the timer 28. When this predetermined time has elapsed, the process proceeds to step S24, where the power supply to the rear glass heating wire 29 is stopped. Then, after a loop operation is performed for a predetermined time in step S25, the process returns to step S21.

Here, the reason why a timer operation is provided in steps S23 and S25 is that since the amount of current flowing through the rear glass heating wire 29 is large, it is intermittent at a certain timing to reduce thermal stress on the rear glass and battery burden.

In the circuit shown in FIG. 3, even when the rear glass heating wire switch 21 is turned on, the rear glass heating wire 29 is energized in the same manner as shown in FIG.

Furthermore, as mentioned above, in the circuit shown in FIG. 3, the rear wiper switch 22 only turns on and off the intermittent energization of the rear glass heating wire 29 in response to the on/off operation; however, in the circuit shown in FIG. Similar to the embodiment shown in FIG. 2, a plurality of mode settings may be made for both the wiper switch and the energization state.

Furthermore, the control operation shown in FIG. 4 of the above modification may be carried out after the control operation shown in FIG. 2 of the embodiment, and furthermore, step S9 of FIG.
It may be implemented by adding the energization control operation of the rear glass heating wire 29 to S12 and S15, respectively.

〔Effect of the invention〕

Since the present invention is configured and functions as described above,
According to this, the operation for defogging the window glass (defrost operation) is automatically set at the same time as the wiper operation mode is set, so the defrost operation by the driver is not required and it is compatible with each of the wiper's multiple operation modes. Since the blower rotation speed and the opening/closing position of the temperature control damper can be set appropriately, it is possible to automatically set the amount of outside air taken into the car interior and the inside air temperature according to the wiper operating mode. Therefore, it is possible to appropriately set the operation mode for defogging the window glass according to changes in the temperature outside the vehicle, etc., and therefore, the operation mode for defogging the window glass can be set appropriately according to changes in the temperature outside the vehicle. It becomes possible to finely and accurately set and control the glass defogging mode, and furthermore, when the wiper operation mode selection means selects the cleaning water injection mode, the air conditioner operates and the inside/outside switching damper switches to the outside air side. As a result, especially when the wipers are operated in the washing water injection mode, it is possible to maintain the operation in the stopped state without starting the air conditioner, etc., and in this point, power consumption is effectively reduced. It is possible to provide a vehicle window glass defogging control device that is unprecedented and excellent in that it can reduce fogging.

[Brief explanation of drawings]

The figures show an embodiment of the vehicle window glass defogging control device according to the present invention, and FIG. 2 is a flowchart showing the operating procedure of the circuit in FIG. 1, FIG. 3 is a block diagram showing a modified example for controlling the operating mode of the rear glass heating wire according to the operating mode of the rear wiper, and FIG. 4 is a flowchart showing the operating procedure of the circuit in FIG. 3; 1...Front wiper operation mode selection switch as wiper operation mode selection means, 2...
Front wiper motor control circuit as wiper operation mode selection means, 7... Control circuit, 8...
Air conditioner, 9...Inside/outside air switching damper, 10...Blower, 11...Temperature adjustment damper, 27...Electrification control circuit.

Claims (1)

[Claims] 1. Wiper operation mode selection means for selecting one of a plurality of operation modes such as intermittent, low speed, or high speed for the wiper, and this wiper operation mode selection means selecting one of the operation modes. A vehicle air conditioning control device comprising: a control circuit that instructs each corresponding drive circuit to start a separately installed air conditioner, switch an inside/outside air switching damper to the outside air side, etc. when selected; has an air volume/temperature variable setting function that appropriately variably sets the rotational speed of the blower and the opening/closing position of the temperature control damper in accordance with each of the plurality of wiper operation modes selected by the wiper operation mode selection means, The wiper operation mode selection means has a washing water injection mode selection function for selecting a washing water injection mode that the wiper has in advance, and is activated when the wiper operation mode selection means selects the washing water injection mode. A defogging control device for vehicle window glass, characterized in that the control circuit has a dehumidification mode release function that stops the operation of the air conditioner and the switching operation of the inside/outside air switching damper to the outside air side.