JPS6371414A - Air conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To carry out demisting in a short time while reducing change in the temp. of a vehicle room by controlling only a cooling means to be in a continuously operating condition for a set period of time at the time of a dewing condition and keeping vehicle room temp. control means except said cooling means in a condition before dewing. CONSTITUTION:A compressor 5 constitutes a part of a cooling means for cooling air to be blown into a vehicle room and is controlled in its driving by an arithmetic and control means 4 based on a vehicle room temp. control signal related to the difference between a vehicle room temp. from a detecting means 2 and a set vehicle speed temp. from a setting means 3. A humidity sensor 6 is provided in the vicinity of the inner face of a vehicle window and dewing on the inner face of the vehicle window is judged by a judging means 7 based on the detected output of the sensor 6. And, a set period of time from the time of generating the judged output is measured by a timer means 8 and, during this measuring period, the compressor 5 is continuously driven by a drive control means 9, prior to a drive control by means of a vehicle room temp. control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner that continuously drives a 17-temperature soother constituting a demisting cooler for a predetermined period of time.

(Prior art) Demis 1 to control of a vehicle air conditioner is performed by installing a humidity sensor near the inner surface of the car window, and determining that condensation has occurred when the humidity detected by the humidity sensor exceeds a predetermined value.
As shown in Publication No. 044, open the demist outlet, drive the cooler or bring in outside air,
Moreover, this is done without using a demisting means which increases the amount of air blown.

Further, as shown in Japanese Utility Model Publication No. 57-5441.1, the temperature of the air immediately after the evaporator is detected by a temperature detection means, and a part of the cooler is constructed according to the temperature detected by the temperature detection means. Some devices have a configuration in which the operation of the compressor is intermittent by a control means, and the operating temperature at which the control means puts the compressor into operation is manually set by a temperature setting means.

(Problem to be Solved by the Invention) In the former case of the above-mentioned conventional example, the greater the demisting capacity, the more the humidity can be lowered when it is determined that condensation has occurred, and the more the car window glass can be unclouded. However, there is a problem in that the influence on the temperature inside the vehicle becomes large and the comfort of the temperature inside the vehicle is disturbed.

In addition, in the case of the latter conventional example, it is possible to change the operating rate of the compressor by changing the operating temperature at which the compressor is activated depending on the season, but it is necessary to manually set the temperature setting means. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a vehicle air conditioner that has a large demisting capacity and suppresses the influence on the temperature inside the vehicle.

(Means for Solving the Problems) In order to solve the above problems, the present invention is constructed as follows.

It constitutes a part of the cooling means 1 that cools the air blown into the vehicle interior 30, and performs drive control in accordance with a vehicle interior temperature control signal related to the difference between the vehicle interior temperature and the vehicle interior temperature set by the temperature setting means 3. A vehicle air conditioner equipped with a compressor 5 includes a humidity detection sensor 6 provided near the inner surface of the car window, and a determining means 7 for determining whether dew has formed on the inner surface of the car window based on the output of the humidity detection sensor 6. , a timer means 8 for counting a set period from the generation of the discrimination output by the discrimination means 7, and a drive control means 9 for continuously driving the compressor 5 with priority over drive control based on the vehicle interior temperature control signal during the time measurement period by the timer means 8. Prepared.

(Function) The vehicle interior air temperature is detected by the vehicle interior temperature detection means 2,
The vehicle interior temperature and the vehicle interior temperature set by the temperature setting means 3 are supplied to the arithmetic and control means 4, and the arithmetic and control means 4 calculates a vehicle interior temperature control signal related to the difference between the vehicle interior temperature and the set vehicle interior temperature. Ru. The drive of the compressor 5 is controlled in accordance with this calculated vehicle interior temperature control signal. In addition, the amount of air blown by the blower 15, which sucks air through the intake damper 14, which selects whether to introduce and inhale outside air or introduce air into the vehicle interior, and blows the air into the vehicle interior 30, is controlled in accordance with the vehicle interior temperature signal. The indoor temperature is controlled to the set cabin temperature.

When the determining means 7 determines that there is dew condensation on the inner surface of the window glass based on the humidity detected by the humidity sensor 6, the timer means 8 starts measuring time from that time.

During this time period, the compressor 5 is controlled to be continuously driven by the drive control means 9, giving priority to the drive control based on the vehicle interior temperature control signal.

As a result, if it is determined that there is condensation, the compressor 5
is continuously driven for a predetermined period of time to rapidly demist.
The fog on the car window glass will clear up in a short time. On the other hand, there are no changes in the operating variables for controlling the cabin temperature other than the cooler 1, such as the opening degree of the intake damper 14 and the amount of air blown by the blower 15.

Therefore, since the continuous driving period of the cooler is constant and there is no change in the vehicle interior temperature operating variables other than the cooler 1, the influence on the vehicle interior temperature is small.

(Example of the invention) The present invention will be explained below using examples.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

21 is an air conditioner main body, and 22 is a control device that controls the air conditioner main body.

The air conditioner main body 21 has an intake damper 2 which controls whether the intake air is to be internally circulated, partially introduced into the outside air, or completely introduced into the outside air from the upstream side to the downstream side of the duct 23.
4. A blower 25 that blows the air sucked in through the intake damper 24 to the vehicle interior 30, an evaporator 26 that exchanges heat with the blown air during operation of a cooler 36 (described later), and a heater 2B (described later) in the air that has passed through the evaporator 2G. A mix damper 27 that controls the amount of air to be diverted, a heater core 28 that circulates the cooling water of the on-vehicle internal combustion engine 29 and acts as a power heater to heat the passing air, and an air blowout to the vehicle interior 30 [
mode switching damper 3], 312 for selecting the mode switching damper 3], 312.

Compressor 32, condenser 33, receiver tank 3
4. The expansion valve 35 and the evaporator 26 constitute a cooler 36. Furthermore, the rotation of the output shaft of the on-vehicle internal combustion engine 29 is transmitted to a pulley 37. The rotation of the pulley 37 is transmitted to the compressor 32 via the magnetic clutch 38, and the compressor 32 is driven by this transmission.

The evaporator 26 is equipped with a defrost thermoswitch 42 to prevent frost formation. The drive of the drive circuit 50 is given priority to control by the drive circuit 50 and is stopped. This is achieved, for example, by supplying a voltage via the defrost thermoswitch 42 to the magnetic clutch 38 in parallel with the drive voltage from the drive circuit 50. The defrost 1-thermo switch 42 has two set temperature levels, a normal level and a low temperature level lower than the normal level, one of which can be selected.

The air outlets to the vehicle interior 30 are a Gent outlet 1" 39 that blows air toward the occupant's face, a heat outlet 40 that does not blow air from the occupant's feet, and a defrost outlet that blows air along the inner surface of the windshield. It is equipped with 41,
One or two of the air outlets are selectively opened by the mode switching dampers 311° and 31□.

The intake damper 24 is driven by a motor actuator 45, the mix damper 27 is driven by a motor 7 actuator 4G, and the mode switching dampers 31° and 31□ are driven by a motor actuator 47, respectively. In FIG. 2, reference numerals 48 to 52 are drive circuits that respectively drive the motor actuator 45, the blower 25, the magnetic clutch 38, and the motor actuators 46 and 47, respectively. This control is based on temperature control that is controlled in accordance with an indoor temperature control signal.

43 is a drive circuit that switches and drives the set temperature level of the defrost thermoswitch 42.

On the other hand, an inside air temperature sensor 53 that detects the indoor air temperature, a solar radiation amount detection sensor 54 that detects the amount of solar radiation, an evaporator outlet air temperature sensor 55 that detects the evaporator exit air temperature, that is, the temperature at point A, and an outside air temperature sensor that detects the outside air temperature. A temperature sensor 56, a setting device 57 for setting the vehicle interior temperature, and a potentiometer 58 for detecting the opening degree of the mix damper are provided.

Furthermore, a humidity sensor 61 is provided near the car window to detect the humidity on the inner surface of the car window. temperature sensor output,
The output of the setting device 57, the output of the potentiometer 58, and the output of the humidity sensor 61 are supplied to an A/D converter (hereinafter referred to as ADC) 59 via a multiplexer (not shown) and converted into digital data. The digital data thus obtained is supplied to the microcomputer 60.

The microcomputer 60 basically includes a CPU, a ROM that stores programs, a RAM that stores data, an input port, an output port, and a timer. ROM
ADC59 according to the program written in ↑a
The digital data output from is read through the input port, and the data processed and calculated by the CPU is output to the drive circuits 43, 48 to 52 through the output port, and changes the opening degree of the intake damper 24 and the blower 25. The drive, stop, and air flow rate, the operation of the compressor 32 controlled via the magnetic clutch 38, and the opening degree of the mix damper are controlled to bring the vehicle interior temperature to the set temperature. Further, a blowout mode control is performed in which an air outlet corresponding to the temperature of the blowing air is selected and opened.

The operation of the present invention is illustrated in FIGS. 3 and 5 according to the program stored in the ROM of the microcomputer 60.
This will be explained using flowchart 1 in the figure.

When the program starts running, initial settings such as clearing the RAM are performed (step a), and output digital data from the ADC 59 is read through the input port and temporarily stored in a predetermined area of the RAM (step b). )
. Vehicle interior temperature control signal (hereinafter referred to as integrated data) T=
TR-1-KITE+KzTA+K:l
T s K 4 T D + K s is calculated and stored (step C). Here, T and l are the vehicle interior air temperature, TE is the evaporator outlet air temperature, TA is the outside air temperature,
T3 indicates the amount of solar radiation, which is detected by sensors 53 to 56. T is the set temperature set by the setting device 57, and K and 5 are constants. Therefore, the integrated data T is related to the deviation between the set vehicle interior temperature and the detected vehicle interior air temperature, and also corresponds to a value corrected by the evaporator outlet air temperature TE, solar radiation amount 'rs, and outside air temperature TA. It can also be said to be a value related to the heat load for controlling the temperature to the set cabin temperature.

Following step C, the blowout temperature data T F = T!
+6θ+β is calculated and stored (step d)
.

Here, θ indicates the 0 opening degree of the mix damper 2, and the opening degree when all the air that has passed through the evaporator 26 passes through the heater core 28 is θ=100% (full heat). Furthermore, 6 and β are constants. Therefore, the blowout temperature data TF corresponds to the blowout temperature at which air is blown into the vehicle compartment 30.

Following step d, the air flow rate is controlled (step e). The air flow rate control is performed according to the total data T as shown in Fig. 4 fa.
) is applied to the drive motor of the blower 25 each time. Following step e, the mix damper opening degree is calculated in accordance with the pattern shown in FIG. ), then the compressor driving temperature is calculated according to the pattern shown in FIG. Compressor drive control is performed to control the drive of the compressor 32 via the drive circuit 50 (step g).

In this case, the set temperature level of the defrost thermo switch 42 is set to the normal level.
6 falls below the set temperature level of the defrost thermo switch 42, the magnetic clutch 38
is deenergized, the driving of the compressor 32 is stopped, and the surface temperature of the evaporator 26 is not lowered below the set temperature level of the defrost thermoswitch 42.

Following step g, intake damper opening degree control is performed to control the opening degree of the intake damper 24 in relation to the amount of air blown and the drive mode of the compressor (step h). Furthermore, according to the data TF, a blowout mode control is performed to open the heat outlet 40, the vent outlet 39, or the vent outlet 39 and the heat outlet 40 (step i).
, Step i is followed by demisting control (Step j), and Step b is executed again.

When entering the demist control (step j), it is checked whether or not there is dew condensation based on whether the humidity detected by the humidity sensor 61 is higher than a predetermined humidity (step j+).

When the detected humidity is equal to or higher than the predetermined humidity, it is determined that there is condensation, and following step j1, the timer is activated (step L), the set temperature level of the defrost thermo switch 42 is switched to a low temperature level, and the compressor 32 is activated by the magnet. It is continuously operated via the clutch 38 until the time set by the timer elapses (steps j3 and jt). Demisting is performed by this continuous operation of the compressor 32.

Following step j4, when the set time of the timer has elapsed, the set temperature level of the defrost thermoswitch 42 is switched to normal, and the compressor automatic drive control is performed again in the same manner as step g (step js), and then step b is executed. Therefore steps jI~j,
is executed, the defrost thermo switch 42 is activated for the period set by the timer in steps j3 and j4.
The set temperature level of is switched to the low temperature level, and the compressor 32 can be operated continuously until the surface temperature of the evaporator 26 reaches this set temperature, and the continuous operation of the compressor 32 drives the cooler 36 at its maximum capacity. Demise 1 ~ is being performed, and this demise ]・ is being performed 1! During J1, the opening degree of the intake damper 24, the amount of air blown by the blower 25, and the opening degree of the mode switching dampers 311 and 31□ are maintained at the state before the demist control.

When it is determined in step jl that there is no condensation, that is, when the humidity detected by the humidity sensor 61 is less than the predetermined humidity, step b is executed following step j1,
Steps j2-j are bypassed, and the demist control is substantially bypassed.

In addition, although in the above-mentioned embodiment, the set temperature level of the defrost 1 thermos isoji 42 is switched to the low temperature side level during the period of steps j3 and j4, the contact point of the defross 1 thermos isoji 42 is bypassed without switching to the low temperature side level. Then, the voltage may be applied to the magnetic clutch 38 during the timer setting period of steps j3 to j4, regardless of the surface temperature of the evaporator 16.

By doing so, the compressor 32 is continuously driven for the period set by the timer. Even in this case, the continuous time of the compressor 32 is relatively short, and there is no problem in protecting the compressor 32.

(Effects of the Invention) As explained above, according to the present invention, when a condensation state is determined, only the cooling means is controlled to be in continuous operation for a set time, and the opening of the intake damper and the blower are controlled for temperature control. Since the cabin temperature control means, excluding the cooling means, such as air volume, mix damper opening, mode damper opening, etc., are maintained as they were before condensation, demisting can be done for a short period of time, and there is little change in the cabin temperature. I'll try it. Furthermore, since the demisting can be carried out in a short period of time, the period during which the cooling means is in continuous operation can be set short, and there is no need to set this one living room according to the season. Furthermore, since the period of continuous operation of the cooler is short, the evaporator does not freeze, and the compressor is protected.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. 3 and 5 are flowcharts for explaining the operation of one embodiment of the present invention. FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention. 1... Cooling means, 2... Vehicle interior temperature detection means, 3.
...Temperature setting means, 4. Arithmetic control means, 5. Compressor, 6. Humidity sensor, 7. Discrimination means,
8...Timer, 9...Drive control means, 14...Intake damper, 15...Blower. Patent applicant: Nobuo Sunako, agent of Dacel Kiki Co., Ltd., patent attorney Fig. 3 Start initial setting signal input Combined data Calculation data TF calculation Air flow control Mix damper Wide opening control Compressor automatic drive control Intake damper h Opening control blowout mode Control i Fig. 4 TO total data To total data 0 total data ---''

Claims (2)

[Claims] (1) Consists of a part of the cooling means that cools the air blown into the vehicle interior, and is driven in accordance with a vehicle interior temperature control signal related to the difference between the interior air temperature and the vehicle interior temperature set by the temperature setting means. In a vehicle air conditioner equipped with a controlled compressor, a humidity sensor provided near an inner surface of a car window, a determining means for determining whether dew condensation has formed on the inner surface of the car window in response to an output of the humidity sensor, and the determining means and a drive control means for continuously driving the compressor with priority over drive control based on the vehicle interior temperature control signal during the time measurement period by the timer means. Air conditioner for vehicles. (2) The drive control means detects that the surface temperature of the evaporator that constitutes a part of the cooling means is below the set temperature, and controls the compressor to stop in accordance with the detection output, giving priority to the vehicle interior temperature control signal. The vehicle air compressor according to claim 1, further comprising a control means for substantially invalidating the output of the stop control means during a time measurement period by a timer means, and continuously driving the compressor during the time measurement period. harmonization device.