JPH0258125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to blowout temperature adjustment control that is linked to blowout mode switching of a car air conditioner (automotive air conditioner).

[Conventional technology]

Conventionally, in order to keep the temperature inside the vehicle close to the target set temperature, air mix dampers were controlled to a predetermined target opening degree to supply air at a predetermined temperature from the air conditioning unit into the vehicle interior. It is known (for example, JP-A-55-143345).

Traditionally, car air conditioners that use an air mix damper in the temperature control section change the blowout mode, such as vent, heat, bilevel, defroster, The ventilation system of the air conditioner changes in each mode, that is, the ventilation resistance changes, so even if the air mix damper position is the same, the temperature of the air blown from the air conditioning unit changes when the blowout mode is changed. A problem occurred.

If we explain that when the air mix damper opening is 0%, it is the maximum cooling state, and when it is 100%, it is the maximum heating state. This means that the heater in the air conditioning unit is warmed up and the blowing mode is fixed. Accordingly, the temperature of the air blown from the air conditioner is determined at each damper opening degree of 0% to 100%. Therefore, in the past, the air mix damper opening and outlet air temperature were approximated by a single straight line, and the air mix damper opening was adjusted assuming that the outlet air temperature did not change even if the outlet mode was changed. I was in control. However, upon closer examination, as shown in Figures 1 and 2, the relationship between the air mix damper opening and the blown air temperature changes slightly in each mode. For this reason, even if one mode is set to obtain an almost accurate blowout temperature, the error in the blowout temperature may become large in the other mode, resulting in
It was not possible to control the room temperature with excellent stability and accuracy, or to control the temperature of the blown air.

[Problem to be solved by the invention]

The above-mentioned fluctuations in the temperature of the blowing air depending on the blowing mode can be suppressed by detecting the temperature of the blowing air and performing feedback control as disclosed in Japanese Patent Application Laid-Open No. 55-91413. It is necessary to provide a sensor to detect this, and in particular, in order to cope with switching of the blowing mode, it is necessary to provide a sensor for each blowing outlet, which poses a problem of increased costs.

Furthermore, as disclosed in JP-A No. 55-47912, when the detected value of the temperature sensor is corrected according to the blowout mode, the suction state, air flow rate, and blowout are automatically controlled by a signal including the detected value of the temperature sensor. There was a problem that the air conditioner control could become unstable due to the air conditioner being affected.

Therefore, the present invention makes it possible to obtain the desired blowout temperature in each blowout mode without providing a sensor for detecting the blowout air temperature, and furthermore, it is possible to obtain the desired blowout temperature in each blowout mode, and also to
Another object of the present invention is to provide a car air conditioner control device that can perform good temperature control with a simple configuration without affecting automatic control of air outlet conditions and the like.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a temperature control member configured as shown in FIG. A car air conditioner control device comprising: a control device that controls the temperature adjustment member and the blowout condition adjustment device to adjust the blowout temperature and blowout condition in accordance with input from a sensor; a calculating means for calculating a required air outlet temperature necessary to bring the vehicle interior temperature close to and maintain the target temperature based on the temperature and the outside air temperature; Adjust the blowout condition accordingly,
a first adjusting means for automatically adjusting the blowing condition in accordance with the necessary blowing temperature calculated by the calculating means when the blowing condition is not set from the switch panel; and the necessary blowing temperature calculated by the calculating means; In order to determine the adjustment amount of the temperature regulating member to obtain the same blowing temperature from the necessary blowing temperature, the blowing state adjusted by the first adjusting means is determined from a plurality of determining characteristics preset for each blowing state. a selection means for selecting a determination characteristic according to the determination characteristic; a determination means for determining an adjustment amount of the temperature adjusting member from the required blowing temperature calculated by the calculation means based on the determination characteristic selected by the selection means; A car air conditioner control device is employed, which includes a second adjusting means for adjusting the temperature adjusting member according to the adjustment amount determined by the determining means.

Incidentally, FIG. 7 shows, as an example, an air mix damper used as the temperature regulating member.

[Effect]

According to the configuration of the present invention described above, the calculation means calculates the necessary blowout temperature necessary to bring and maintain the vehicle interior temperature close to the target temperature, and the blowout state and the blowout temperature are adjusted according to this necessary blowout temperature. The temperature is regulated.

First, the blowing condition is adjusted by a first adjusting means, and when the blowing condition is set from the switch panel, the first adjusting means adjusts the blowing condition according to the setting request, and when the blowing condition is set from the switch panel, the blowing condition is adjusted by the first adjusting means. When is not set, it means that automatic adjustment of the blowing condition is required, so the blowing condition is automatically adjusted in accordance with the above-mentioned required blowing temperature.

On the other hand, the blowing temperature is adjusted by controlling the adjustment amount of the temperature adjustment member by the selection means, the determination means, and the second adjustment means.

In the present invention, a plurality of determining characteristics are provided for each blowing state for determining the adjustment amount of the temperature regulating member to obtain a blowing temperature equal to the necessary blowing temperature from the necessary blowing temperature, and this determining characteristic is determined by the selection means. Selected depending on the state.

The determining means determines the adjustment amount of the temperature adjusting member from the required blowing temperature based on the determining characteristic selected by the selecting means according to the blowing state. Therefore, the adjustment amount determined by this determining means is an adjustment amount that corresponds to the blowing state, and is an adjustment amount that can obtain a blowing temperature equal to the required blowing temperature in that blowing state. Moreover, since the determining characteristic is selected by the selection means, even if the blowing condition changes, an adjustment amount that can obtain a blowing temperature equal to the required blowing temperature in the blowing condition after the change is determined.

The second adjusting means adjusts the temperature adjusting member according to the adjustment amount determined as described above, and causes the air conditioner to blow out air at a temperature equal to the required blowing temperature.

The operation of the present invention described above will be explained by taking the characteristics shown in FIG. 1 as an example. If the air conditioner has the control characteristics of the blowout temperature as shown in Figure 1, the opening degree of the air mix damper can be determined from the required blowout temperature (horizontal axis) based on the determination characteristics as shown in Figure 3. (Amount of adjustment of the temperature regulating member) (vertical axis) is determined, and by controlling the air mix damper, a blowing temperature equal to the required blowing temperature can be obtained. The determined characteristic shown in FIG. 3 is obtained by inverting the actual characteristic shown by the solid line in FIG. 1 by a straight line shown by a dashed-dot line.

Also, for the heat mode, the determining characteristics are set in the same manner as above from Figure 2, and by selecting and using these according to the vent and heat blowing conditions, the blowing temperature is equal to the required blowing temperature in any blowing condition. Temperature is provided by an air conditioner.

〔Example〕

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In this embodiment, the present invention is applied to a generally known car air conditioner of a cold air/warm air mixing type (air mix type). In FIG. 4 showing the overall system, an outside air suction port 1a for introducing outside air and an inside air suction port 1b for circulating inside air are provided on the upstream side of a ventilation duct 1 installed at the front of the vehicle compartment. Both suction ports are opened and closed by an inside/outside air damper 2. In the ventilation duct 1, toward the downstream side, there are a blower motor 3, an evaporator 4 forming part of the refrigeration cycle cc, a heater core 5 forming a part of the cooling water cycle HC of the engine EG, and a connection with the air passing through the heater core 5. Air mix dampers 7 for adjusting the temperature are arranged in order to adjust the ratio of air passing through the bypass passage 6. At the most downstream part of the ventilation duct 1, there are a plurality of air outlets for blowing out the temperature-controlled air in the duct in each direction inside the vehicle.
A VENT1c and a HEAT1d are provided, and these outlets are opened and closed by an outlet damper 8.

In order to perform temperature control and various operation mode controls, the control device 10 receives various information signals, executes processing based on a preset control program, and operates the air conditioning function sections 1 to 8 described above. It is specified electrically.

As a means for inputting various information signals to the control device 10, an inside temperature sensor 21 including a heat-sensitive resistor that generates an analog voltage signal Tr' corresponding to the temperature inside the vehicle interior, and an analog voltage signal corresponding to the temperature outside the vehicle interior.
Outside temperature sensor 2 including a heat-sensitive resistor that produces Tam′
2. A temperature setting device 23 including a potentiometer that generates an analog voltage signal Tset' corresponding to the set temperature (set position), a potentiometer that generates an analog voltage signal Ar' corresponding to the opening degree of the air mix damper 7. an opening sensor 4 including an opening sensor 4, a cold air sensor 25 including a heat-sensitive resistor that generates an analog voltage signal Ta' corresponding to the air temperature near the downstream side of the cooler core 4, and an analog voltage signal corresponding to the cooling water temperature in the piping of the cooling water cycle HC. A water temperature sensor 26 including a heat-sensitive resistor that generates Tw', and a switch panel 11 that generates on/off signals by operating a group of switches such as operation, stop, and operation mode selection are provided.

In addition, the engine EG is used as a means for operating functional elements according to electrical commands from the control device 10.
an electromagnetic clutch 31 that disconnects and continues the driving force from the refrigeration cycle cc to the refrigeration cycle cc; an electromagnetic valve 32 that opens and closes the cooling water circulation path to the heater core 5 in the heating cycle HC;
and negative pressure actuators 33, 34, 35 controlled by electromagnetic valves that use engine negative pressure to open and close the internal and external air damper 2, temperature control damper 7, and outlet damper 8.
is provided. The display panel 12 displays the operating status of the air conditioner and the control device based on the output signal of the control device 10.

When the ignition switch 13 of the vehicle is turned on, the control device 10 is supplied with power from the vehicle battery 14 and becomes ready for operation. As shown in FIG. 5, the control device 10a includes a digital computer (microcomputer) 10a that performs information processing based on a preset control program, and analog signals from signal input means 20, 22, 23, 24, 25, and 26. An analog input interface 10b that selectively converts voltage signals from analog to digital and inputs them to the computer 10a; a digital input interface 10c that formats the on/off signals of each switch from the switch panel 11 and inputs them to the computer 10a; A power amplifier circuit 10d that amplifies each operation command signal of the functional elements 31 to 35 output from the computer 10a, an information processing clock generation circuit 10f, an interface 10e for controlling the rotational speed of the blower motor 3, a constant voltage circuit, and an ignition circuit. The computer 10a is comprised of an initialization circuit (none of which is shown) that starts the operation of the computer 10a immediately after the switch 13 is turned on.

FIG. 6 shows a control program for the digital computer 10a. This control program is read out from the program memory (ROM) in the digital computer 10a when the central processing unit (CPU) starts operating, and defines the operation of the control device 10 in relation to the input/output circuit of the CPU, and controls the entire electrical control system. and regulates the operation of car air conditioners.

In the normal operation mode, the digital computer starts calculation processing from step 100 of the program. In step 101, ON and OFF signals of the switch panel 11 (blowout mode signal, etc.),
The vehicle interior air temperature Tr', the outdoor air temperature Tam', the damper opening degree Ar', the cooler temperature Ta', the heater temperature Tw', and the temperature setting device 23 are generated by various sensors 21, 22, 24, 25, and 26. Each analog voltage signal indicating the set target temperature Tset' is converted into a binary code signal in order, and the digital data Tr, Tam, Ar, Ta,
Write Tw and Tset to a specified address in the temporary memory (RAM) built into the digital computer. In the next step 102, the necessary amount of heat to be blown out from the ventilation duct 1 is calculated based on each data inputted in step 101. For example, in this embodiment, assuming that the blowing capacity of the blower motor 3 is constant, the blowing air temperature is calculated.
Calculated as the value of Ta ₀ . This calculation is expressed by the following formula.

Ta ₀ = Kset・Tset−Kam・Tam−Kr・Tr+C
…(1) However, Tset…Target temperature, Tr…Indoor temperature,
Tam...Outside temperature, C...Constant, Kset・Kr・Kam
...A gain in the control system, determined in advance through experiments etc. to satisfy the condition of making the vehicle interior temperature Tr match the set temperature Tset without being affected by the outside temperature Tam.

In the next step 103, it is determined whether or not the required blowout temperature Ta ₀ is higher than the heater temperature Tw. If it is higher (YES), in step 104 the temporary damper opening degree A ₀ of the air mix damper is set to 100. (%).
If the determination result in step 103 is NO, the process advances to step 105. In step 105, it is determined whether the necessary blowout temperature Ta ₀ is lower than the cooler temperature Ta. If it is low, proceed to step 106 and set the temporary damper opening degree A0 to ₀ (%). If the determination result is NO, the process proceeds to step 107, where a temporary damper opening degree A ₀ (%) is calculated and set using the following formula.

A ₀ = 100 (Ta ₀ − Ta) / Tw − Ta … (2) Calculation using equation (2) shows that the relationship between the air mix damper opening degree and the blowout temperature has an ideal linear control characteristic. Based on the premise, when obtaining the required outlet air temperature Ta ₀ , the cooler temperature
This shows that the damper opening degree (A ₀ ) is calculated according to Ta and heater temperature Tw.

As described above, the temporary damper opening degree _A0 of the air mix damper is determined from the required blowout temperature _Ta0 , and in the following steps, corrections are made corresponding to the blowout mode to obtain the true blowout temperature necessary to obtain the necessary blowout temperature _Ta0 . Determine the air mix damper opening SW.

In step 108, it is determined whether the blowout mode signal of the switch panel 11 is VENT. and
If YES, VENT is required, step 111
Then, in order to blow out temperature-controlled air from the VENT outlet 1c, a command signal is sent to the functional element 35 to move and fix the damper 8 downward. And in step 112,
Using the conversion table corresponding to the VENT blowout mode, the true air mix damper opening SW is determined from the temporary damper opening A ₀ , and the process moves to the air mix damper drive program starting at step 115.

Note that the conversion table shown in step 112 is
The relationship between the air mix damper opening degree and the actual outlet temperature in VENT outlet mode (outlet temperature characteristics) is determined through experiments, and is created based on the test results. Specifically, the opening degree of the damper that provides an actual blowout temperature equal to the arbitrary required blowout temperature is determined from the above test results, and then calculated from equation (2) according to this damper opening degree and the above arbitrary required blowout temperature. The conversion table is created by associating the tentative damper opening degrees.

Therefore, it is possible to reliably determine the damper opening degree that provides an actual blowout temperature that is equal to the required blowout temperature. In addition, since the temporary damper opening is calculated using equation (2) and then converted to the true damper opening, the actual blowout temperature, which is equal to the required blowout temperature, will depend on the cooler temperature Ta and heater temperature Tw. The resulting damper opening degree can be determined reliably.

On the other hand, no VENT is requested at step 108.
If NO, in the next step 109, it is determined by the switch panel 11 whether HEAT is requested. When HEAT is requested, the process proceeds to step 113, where a command signal is sent to the functional element 35 to move and fix the damper 8 upward so that air is blown from the HEAT outlet 1d. Then, in step 114, the conversion table corresponding to the HEAT blowing mode is used to find the true air mix damper opening SW, and the process proceeds to step 115.

Note that the conversion table shown in step 114 is obtained in the same manner as the conversion table in step 112 described above for the HEAT blowing mode.

HEAT is not required in step 109
When NO, VENT from the switch panel,
Since fixation to HEAT is not requested, this step determines that automatic switching is requested, and automatically switches the blowing mode.
Process 110. Specifically, when the required air outlet temperature Ta ₀ is high, HEAT air is used, and when it is low, VENT air is used.
Switching is performed with a hysteresis of 10°C. If the result of this judgment is VENT, the process proceeds to step 111; if the result is HEAT, the process proceeds to step 113, and the respective processes are performed.

Thus, in this embodiment, step 108,
Step 112 and step 114 are performed by processing steps 109 and 110.
The conversion table has been changed.

Steps 115 to 119 show processing for converging the actual damper opening degree Ar to the true air mix damper opening degree SW in order to obtain the blown air temperature Ta ₀ .
First, in steps 115 and 117, the damper opening degree Ar read in step ₁₀₁ is set within a predetermined range (SW±
Determine whether or not it is within a ₀ ). _a0 is a value for adding a certain range to the adjustment position SW of the damper 7 to stabilize the opening control, and is a value for providing a so-called dead zone.

If it is determined in step 115 that the actual damper opening degree Ar is larger than the predetermined value SW+ _a0 , the process proceeds to step 116, where the negative pressure of the negative pressure actuator 34 acting on the air mix damper 7 is relaxed;
Decrease the damper opening degree Ar. Also, in step 117, the actual damper opening degree Ar is set to the predetermined value SW−a ₀
If it is determined that it is smaller, the process proceeds to step 118 and the negative pressure of the negative pressure actuator 34 acting on the damper 7 is increased. When the damper opening degree Ar enters the adjustment range SW±a ₀ , a command to stop the operating position of the negative pressure actuator 34 is issued in step 119.

The points explained above are the main points of the present invention, and from the next step 120, the compressor control,
Conventionally known controls such as blower control and suction control are processed, the process returns to data input step 101, and the air conditioning control process is sequentially repeated.

Note that the present invention can also be applied to the following modifications.

(1) The conversion table for each blowout mode as shown in steps 112 and 114 has its characteristics modified in accordance with blowout modes such as defroster and bi-level in addition to the vent and heat blowout modes of the above embodiment. It is also possible to set something and use it to correct the damper opening. Also, if they have similar characteristics, they may be used in common.

(2) In the above example, the temporary air mix damper opening degree A ₀ is determined from the required blowout temperature Ta ₀ according to the characteristics of equation (2).
After that, the true air mix damper opening SW was determined from the characteristics shown in steps 112 and 114 set for each blowout mode, but SW may also be determined directly from Ta ₀ if necessary. In the process, the damper opening degree may be determined for each blowout mode. In this case, the required blowing temperature Ta ₀
The characteristics for directly determining the damper opening degree SW are set in advance as different characteristics for each blowout mode.

(3) The correction functions illustrated in steps 112 and 114 are not limited to curves, and may be approximated by broken lines.

[Effects of the Invention] As explained above, according to the present invention, the amount of adjustment of the temperature regulating member to obtain the required blowout temperature is determined by characteristics that differ depending on the blowout condition, so that the temperature inside the vehicle can be brought closer to the target temperature. Regardless of the blowing mode, the temperature of the blowing air to be maintained can be reliably obtained, and good temperature control can be achieved. Further, since a sensor for feeding back the blowout temperature is not required, it is possible to suppress fluctuations in the blowout air temperature for each blowout mode with a simple configuration that minimizes cost increase.

In addition, it is possible to suppress changes in the blowout air temperature due to changes in the blowout mode and perform stable air conditioning control without affecting the first adjusting means that automatically adjusts things other than the blowout temperature.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram of the air mix damper opening and outlet air temperature in the vent (VENT) blowout mode, Figure 2 is the same characteristic diagram in the HEAT (HEAT) blowout mode, and Figure 3 is a characteristic diagram of the air mix damper opening in the vent blowout mode. Figure 4 is an overall configuration diagram of a car air conditioner to which the method of the present invention is applied. Figure 5 is a block diagram of the electrical system. 7 is a flowchart showing the main part of the control program of the digital computer in FIG. 7, and FIG. 7 is a block diagram showing the configuration of the present invention. 1... Ventilation duct, 5... Heater core, 7...
Air mix damper, 8... Outlet damper, 10
……Control device.

Claims (1)

[Scope of Claims] 1. A temperature control member that adjusts the temperature of the air blowing from the air conditioner; a blow condition adjusting device that adjusts the state of the air blowing from the air conditioner; and the temperature control member that adjusts the temperature of the air blowing from the air conditioner according to inputs from the switch panel and the sensor. and a control device that controls the blowout condition adjusting device to adjust the blowout temperature and the blowout condition, wherein the control device controls the vehicle interior temperature based on the vehicle interior temperature, the target temperature, and the outside air temperature. computing means for calculating the required blowing temperature necessary to approach and maintain the blowing temperature close to the target temperature; when the blowing condition is set from the switch panel, adjusting the blowing condition in accordance with the setting request;
a first adjusting means for automatically adjusting the blowing condition in accordance with the necessary blowing temperature calculated by the calculating means when the blowing condition is not set from the switch panel; and the necessary blowing temperature calculated by the calculating means; In order to determine the adjustment amount of the temperature regulating member to obtain the same blowing temperature from the necessary blowing temperature, the blowing state adjusted by the first adjusting means is determined from a plurality of determining characteristics preset for each blowing state. a selection means for selecting a corresponding determining characteristic; and a determining means for determining an adjustment amount of the temperature adjusting member from the required blowing temperature calculated by the calculating means based on the determining characteristic selected by the selecting means; A car air conditioner control device comprising: second adjusting means for adjusting the temperature adjusting member according to the adjustment amount determined by the determining means. 2. The determining means has a first determining characteristic that determines a provisional adjustment amount (A ₀ ) from the required blowing temperature (Ta ₀ ), and a true adjustment amount (SW) from the provisional adjustment amount (A ₀ ). and a second determining characteristic to be determined.
The car air conditioner control device according to claim 1, characterized in that it is configured to determine the adjustment amount (SW) from the required blowout temperature (Ta ₀ ). 3. The car air conditioner control device according to claim 2, wherein the selection means is configured to select the second determining characteristic depending on the blowing state.