JPH0577526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner adapted to correct a vehicle interior temperature control signal.

(Prior art) Conventional air conditioners for vehicles were
39334, a predetermined gain is added to at least the vehicle interior temperature detection signal and the vehicle interior temperature setting signal to calculate a control signal corresponding to the required blowing temperature, As shown in the publication, a vehicle interior temperature control signal is calculated in accordance with at least a vehicle interior temperature detection signal and a vehicle interior temperature setting signal, and based on the calculated values, the mix damper opening degree, air flow rate, compressor operation timing, and It is known to control temperature control means such as operating rate.

(Problems to be solved by the invention) However, these are limited, for example, because the vehicle interior temperature sensor is supposed to detect the temperature of the flowing air inside the vehicle, but it is installed near the instrument panel of the vehicle. The vehicle air conditioner detects the temperature of the air inside the vehicle within the range specified by the vehicle, and the air conditioner is set to a state other than the one that should be automatically controlled by the vehicle air conditioner, such as manually controlled by the user. If the airflow mode and suction mode are set separately for the vehicle, there is a problem that the airflow near the occupant's feet changes, making it impossible to detect the temperature inside the vehicle correctly, and making it impossible to maintain the temperature inside the vehicle at a constant level. Ta.

In particular, when the intake mode is manually switched from outside air intake to inside air intake from the automatic control state during heating, the temperature detected by the interior temperature sensor may change due to changes in the airflow near the installation part of the interior temperature sensor. There was a problem in that the room temperature was changed unnecessarily.

The present invention solves the above-mentioned problems and improves the indoor air temperature and the indoor air temperature sensor that occur when the intake mode is manually changed from outside air intake to inside air intake, especially during automatic control during heating. It is an object of the present invention to provide an air conditioner for a vehicle that can correct the correlation change with the detected temperature within a predetermined time to prevent temperature fluctuations in the vehicle interior and control the vehicle interior temperature to a constant value.

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

At least a vehicle interior temperature detecting means 1 in which a temperature detecting section is inserted into an air flow passage near an instrument panel of a vehicle.
and a vehicle interior temperature setting means 2, and a calculation means 3 for calculating a vehicle interior temperature control signal based on the output signals from these means, and controlling the temperature control means 5 based on the vehicle interior temperature control signal. Detection means 6 for detecting that the device is in the heat mode and that the damper for sucking air into the vehicle air conditioner has been manually changed from the inside air circulation state to the outside air introduction state or vice versa.
and the detection means 6 detects that the heat mode is set;
and when it is detected that the damper for air suction is manually changed from the inside air circulation state to the outside air introduction state or vice versa, the calculation means 3 calculates a correction value whose maximum value and minimum value are predetermined. In addition to the indoor temperature control signal, a correction means 4 is provided which generates a vehicle indoor temperature control signal for controlling the temperature control means 5.

Further, in the second invention, the correction means 4 is in the heat mode by the detection means 6, and it is detected that the damper for air suction is manually changed from the inside air circulation state to the outside air introduction state, or vice versa. When the temperature control means is controlled by adding a correction value which sequentially increases or decreases over time and whose maximum value and minimum value are predetermined values to the vehicle interior temperature control signal calculated by the calculation means 3. This is used as a correction means to control the indoor temperature.

(Function) In the first invention, the calculation means 3 generates a vehicle interior temperature control signal based on at least the vehicle interior temperature detected by the vehicle interior temperature detection means 1 and the vehicle interior temperature set by the vehicle interior temperature setting means 2. is calculated, and the temperature control means 5, such as the mix damper opening, the air flow rate, and the operating timing and period of the cooler, is controlled based on the vehicle interior temperature control signal via the correction means 4, thereby controlling the vehicle interior temperature. will be carried out.

On the other hand, the detection means 6 detects that the damper for sucking air into the vehicle air conditioner is manually changed from the inside air circulation state to the outside air introduction state or vice versa when the vehicle is in the heat mode. When the detection is made by the means 6, a correction value whose maximum value or minimum value is predetermined is added to the vehicle interior temperature control signal calculated by the calculation means 3, and the vehicle interior temperature control signal to which the correction value has been added is added. Therefore, the temperature control means 5 is controlled.

As a result, when the suction mode is manually changed from the inside air circulation state to the outside air circulation state or vice versa in the heat mode, the correction value is added to the cabin temperature control signal. The temperature control means 5 is controlled by the vehicle interior temperature control signal to which this correction value is added, so that the correlation change between the vehicle interior temperature and the temperature detected by the vehicle interior temperature detection means 1 is controlled by the compensation value. Fixed,
It is possible to maintain a comfortable temperature inside the vehicle.

In the second invention, a correction value that sequentially increases or decreases over time and whose maximum value is a predetermined value is added to the calculated vehicle interior temperature control signal by the correction means 4. The temperature control means 5 uses the vehicle interior temperature control signal to which the correction value has been added.
will be controlled.

As a result, while in heat mode, the suction mode can be changed manually from the inside air circulation state to the outside air circulation state.
or vice versa, the correction value is added to the vehicle interior temperature control signal by the compensation means 4, and the temperature control means is controlled by the vehicle interior temperature control signal to which the compensation value has been added. will be done.

Therefore, a change in the vehicle interior temperature due to a correlation change between the vehicle interior temperature and the temperature detected by the vehicle interior temperature detection means 1 is corrected within a time corresponding to the speed of increase or decrease over time of the correction value, and the Since the temperature is controlled to the set temperature, the period during which temperature changes occur within the vehicle interior is shortened, and the interior of the vehicle interior can be maintained at a comfortable temperature without causing discomfort to the occupants.

(Example of the invention) The present invention will be explained below with reference to Examples.

FIG. 2 is a block diagram of a vehicle air conditioner according to 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 21.

The air conditioner main body 21 sucks in air from the upstream side to the downstream side of the duct 23 via an intake damper 24 that controls whether to circulate internal air, introduce some outside air, or introduce all outside air. A blower 25 that blows air into the vehicle interior 30, an evaporator 26 that exchanges heat with the blown air while a cooler 34 (described later) is in operation
A mixture damper 27 controls the amount of air that flows into a heater core 28 (to be described later), a heater core 28 that acts as a heater and heats the passing air by circulating the cooling water of the on-vehicle internal combustion engine, and a vehicle interior 30.
Mode switching damper 2 that selects the air outlet for
It has 9.

The compressor 35, condenser 36, receiver tank 37, and expansion valve 38 together with the evaporator 26 constitute a cooler 34. Furthermore, the rotation of the output shaft of the vehicle-mounted internal combustion engine is transmitted to the pulley 39. The rotation of the pulley 39 is controlled by the magnetic clutch 4.
0 to the compressor 35, and this transmission drives the component compressor 35.

The air outlet to the passenger compartment 30 includes a vent outlet 31 that blows air toward the face of the occupant, and a heat outlet 32 that blows air from the feet of the occupant. Both are selected.

The intake damper 24 is driven by a motor actuator 33, the mix damper 27 is driven by a motor actuator 41, and the mode switching damper 29 is driven by a motor actuator 42. In addition, in FIG. 2, 44 to 48 are the motor actuator 33, the blower 25, the magnetic clutch 40, the motor actuator 41, and
42 separately.

On the other hand, a temperature sensor 50 is inserted into the air flow path near the instrument panel of the vehicle to detect the interior temperature of the vehicle, a solar radiation sensor 51 detects the amount of solar radiation, and a sensor 51 that detects the evaporator outlet air temperature, that is, the temperature at point A. An evaporator outlet air temperature sensor 52 that detects temperature, an outside air temperature sensor 53 that detects outside air temperature,
A setting device 54 for setting the vehicle interior temperature and a potentiometer 55 for detecting the opening degree of the mix damper are provided. The output of each sensor, the output of the setting device 54, and the output of the potentiometer 55 are transferred to the multiplexer 5.
A/D converter (hereinafter referred to as ADC) via 6
57 and convert it into digital data,
The digital data converted by the ADC 57 is supplied to a microcomputer 58.

The microcomputer 58 is basically a CPU,
It has a ROM that stores programs, a RAM that stores data, an input port, and an output port. Digital data output from the ADC 57 and the output of the manual instruction switch group 59 according to the program stored in the ROM are read through the input port, and the data processed and calculated by the CPU is driven through the output port. Circuit 44~
48, which controls the opening of the intake damper 24, the air flow rate of the blower 25, the operating timing and period of the compressor controlled via the magnetic clutch 40, and the opening of the mix damper 27. The temperature inside the vehicle is controlled to be the set temperature. Note that the ratio between the amount of internal air circulation and the amount of outside air introduced is controlled by the opening degree of the intake damper 24.

The operation of one embodiment of the present invention will be explained with reference to the flowchart of FIG. 3 in accordance with the program stored in the ROM.

When the program starts running, initial settings such as clearing the RAM are performed (step a).
Next, the outputs of the sensors 50 to 53, the output of the setting device 54, the output of the potentiometer 55, and the output from the manual switch group 59, which are converted into digital data via the input ports, are read and stored in the RAM.
In addition, the vehicle interior temperature control signal (hereinafter referred to as integrated data) T=T _R +k ₁
T _E +k ₂ T _A +K ₃ T _S -k ₄ T _D +k ₅ is calculated and stored (step b). Here, T _R is the cabin air temperature,
T _E is the evaporator outlet air temperature, T _A is the outside air temperature,
T _S indicates the amount of solar radiation, and sensors 50 to 53
has been detected by. T _D is the set temperature set by the setting device 54, and k ₁ to _{k 5} are constants.
Therefore, the integrated data T is related to the deviation between the set cabin temperature and the detected cabin air temperature, and also corresponds to a value corrected by the evaporator outlet air temperature T _E , solar radiation T _S , and outside air temperature T _A. , it can also be said to be a value related to the heat load for controlling the vehicle interior temperature to the set vehicle interior temperature.

Following step b, the total data T is corrected as described below (FIG. 5) (step a). below,
The corrected combined data will also be simply referred to as combined data.

Following step c, the outlet temperature data T _F = T _E +
k ₆ θ+β is calculated and stored (step d).
Here, θ indicates the opening degree of the mix damper 27, and the opening degree when all the air that has passed through the evaporator 26 passes through the heater core 28 is θ=
It is set to 100% (full heat). Furthermore, k ₆ and β are constants. Therefore, the data T _F corresponds to the temperature of the air blown into the vehicle compartment 30.

Following step d, the amount of air blown by the blower 25 is controlled according to the pattern shown in FIG. 4a (step e). Next, the opening degree of the mix damper 27 is controlled according to the pattern shown in FIG. 4b (step f), and then the driving set temperature of the compressor 35 is controlled according to the pattern shown in FIG. 4c. (Step g). In step g, when the evaporator outlet air temperature T _E is equal to or higher than the temperature pattern shown in FIG. 4c, the magnetic clutch 40 is energized to drive the compressor 35, and when it is less than the temperature pattern shown in FIG. Compressor control is performed in which the magnetic clutch 40 is de-energized. The horizontal axes of FIGS. 4a, b and c are the combined data corrected in step c. Following step g, the opening degree of the intake damper 24 is controlled to be in the state of air circulation, outside air introduction, or partial outside air introduction in relation to the blower air volume and compressor drive (step h). Through steps e to h, the vehicle interior temperature is controlled to the set vehicle interior temperature. Following step h, blowout mode control is performed to select the vent outlet 31 and/or the heat outlet 32 according to the data T _F (step i);
Following step i, step b is executed again.

The total data correction step c is executed as shown in FIG.

When _the total data correction routine is entered, it is determined whether the total data T is within the heating zone (step c ₁ ). When it is determined that the vehicle is in the heating zone, it is determined whether or not the previously executed intake damper opening control was in the internal air circulation state (step _c2 ). When the inside air is in the circulating state, a flag is checked to bypass the determination as to whether or not the mode is in the heat mode (the state in which the heat outlet is opened by the mode control damper 29) (step _c3 ). When the flag is set, it is determined whether the mode is in heat mode (step _c4 ), and if it is in heat mode, the flag is reset (step _c5 ), and the correction value THR added to the total data T is determined. It is determined whether the value is less than a preset maximum value “a” (step
_c6 ). In step _c6 , when the correction value THR is less than the maximum value, the calculation [THR←(THR+△THR)] is performed to increase the correction value THR at a predetermined gradient, and the correction value is increased by △THR. _c7 ). Here, △THR corresponds to the predetermined slope, and the time to execute the main routine shown in Figure 3 (this time is assumed to be approximately constant).
ΔTHR is added each time, and the correction value increases at a predetermined gradient. Following step c ₇ , total data T
Then, the calculation [T←(T+THR)] is performed (step c ₈ ), and then step d is performed. Furthermore, if the correction value THR is greater than or equal to the maximum value in step _c6 , step _c8 is executed following step _c6 .
Step _c7 is bypassed. Therefore, when steps _c1 to _c8 are executed, the correction value THR increases as shown by the solid line in curve A in FIG. Note that although strictly speaking, the change in the correction value THR is step-like, it is simply shown as a straight line.

When the total data T exceeds "0" in step _c1 , that is, when it is determined that the cooling zone has been entered, and in step _c2 , when it is determined that the intake damper opening is not in the internal air circulation state, that is, When it is determined that the outside air is being introduced or that the outside air is being introduced partially, if it is determined in step _c4 that the mode is other than heat mode, a flag is set (step _c9 ), and a check is made to determine whether the correction value THR is zero or not. is determined (step c ₁₀ ) and the correction value THR
When is not zero, [THR←(THR−△THR)]
is calculated (step _c11 ), followed by step c11.
_c8 is executed. Also, if the correction value THR is zero in step _{c10 ,} the correction value THR is
When THR is zero, step c ₁₀ is followed by step
_c8 is executed and step _c11 is bypassed.
Therefore, when steps _c9 to _c11 are executed, the correction value THR decreases to zero at a slope corresponding to ΔTHR. An example of this is that the correction value is decreased as shown by the broken line in curve A in FIG.

Also, when the conditions are set such that step _c9 is executed before the correction value THR reaches the maximum value "a", that is, when the state changes to the cooling zone, the state changes from the inside air circulation state to the state other than the inside air circulation state. If it is determined in step _c4 that the mode is other than the heat mode, the correction value will change as shown by curve B in FIG. Therefore, regardless of whether it is an automatic control state or a manual control state, when the heating zone is entered and the heat mode is entered, the maximum value "a" is corrected.

Furthermore, during the period from the inside air circulation state to a state other than the inside air circulation state, since the flag is in the reset state after the heat mode is first determined in step _c4 , the heat mode is not present during the above period. The determination as to whether or not this is the case and the flag reset processing are bypassed, and step _c6 is directly executed from step _c3 . In addition, although the case where the correction value is increased or decreased sequentially over time has been explained above, the correction value is set to the maximum value THR.
= a and minimum value THR = 0, step c ₅
Then execute T←T+THR (=a), then execute step d, then execute step c ₉ and then execute T←T
+THR (=0) may be executed, and then step d may be executed. This case corresponds to a case where the slope due to △THR becomes extremely 90°.

As a result of the above, when the blowout mode is automatically controlled, that is, when the blowout mode is controlled by the data T _F , even if the blowout mode changes in order to add a correction value to the total data, the mode cannot be switched. Hunting of the damper 29 is prevented.

(Effect of the invention) When the vehicle air conditioner is in an automatic control state,
In the heat mode, when the suction mode is manually changed from the inside air circulation state to the outside air circulation state, or vice versa, the correlation between the interior air temperature and the temperature detected by the interior air temperature detection means breaks down. Due to this, it was not possible to maintain a constant temperature inside the vehicle,
As described above, according to the first invention, the maximum value and the minimum value are added with predetermined correction values, and the temperature control means is controlled by the vehicle interior temperature control signal to which the compensation values have been added. Fluctuations in the vehicle interior temperature due to correlation changes between the temperature and the temperature detected by the vehicle interior temperature detection means are suppressed, and the vehicle interior temperature is maintained at a comfortable temperature by the setting means provided by the vehicle interior temperature setting means. Furthermore, since the maximum and minimum values of the correction value are predetermined, over-correction will not occur.

Further, according to the second invention, a correction value is added to the vehicle interior temperature control signal, and the temperature control means is controlled by the vehicle interior temperature control signal to which the compensation value has been added, and the compensation value increases sequentially over time. Therefore, the increase or decrease in the temperature control signal to which the correction value is added is gradual, and there is almost no fluctuation in the cabin air temperature, and the temperature control signal to which the correction value is added is gradually increased or decreased, and the temperature control signal increases or decreases at a speed corresponding to the temporal increase or decrease of the correction value. Within a certain period of time, fluctuations in the vehicle interior temperature due to correlation changes between the vehicle interior temperature and the temperature detected by the vehicle interior temperature detection means are suppressed, and the vehicle interior temperature is almost maintained at the set temperature by the vehicle interior temperature setting means, resulting in a comfortable temperature. is maintained. Furthermore, since the maximum and minimum values of the correction values are set to predetermined values, over-correction will not occur.

[Brief explanation of the drawing]

FIG. 1 is a functional 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 and FIG. 6 are diagrams for explaining the operation of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... In-vehicle temperature detection means, 2... In-vehicle temperature setting means, 3... Calculation means, 4... Correction means, 5
...Temperature control means, 6...Detection means.

Claims (1)

[Scope of Claims] 1. At least a vehicle interior temperature detection means and a vehicle interior temperature setting means in which a temperature detection section is inserted while the airflow is passing near the instrument panel of the vehicle, and an output signal from these means to detect temperature inside the vehicle interior. In a vehicle air conditioner comprising a calculation means for calculating a temperature control signal and controlling the temperature control means based on a vehicle interior temperature control signal, the vehicle air conditioner is in a heat mode and for sucking air into the vehicle air conditioner. a detection means for detecting whether the damper is manually changed from an inside air circulation state to an outside air introduction state or vice versa; When a change is detected from the inside air circulation state to the outside air introduction state or vice versa, a correction value having predetermined maximum and minimum values is added to the vehicle interior temperature control signal calculated by the calculation means to control the temperature. An air conditioner for a vehicle, comprising: a correction means that uses a vehicle interior temperature control signal to control the means. 2. At least a vehicle interior temperature detection means and a vehicle interior temperature setting means, each of which has a temperature detection section inserted into an air flow path near the instrument panel of the vehicle, and a vehicle interior temperature control signal calculated from the output signals from these means. A vehicle air conditioner is equipped with a calculation means and controls the temperature control means based on a vehicle interior temperature control signal, and the vehicle air conditioner is in a heat mode and a damper for sucking air into the vehicle air conditioner is manually operated to control the temperature control means based on a vehicle interior temperature control signal. a detection means for detecting a change from a circulating state to an outside air introduction state or vice versa; increases or decreases sequentially in time when detected as changing to the state or vice versa,
and a correction means for adding a correction value whose maximum value and minimum value are predetermined values to the vehicle interior temperature control signal calculated by the calculation means to generate a vehicle interior temperature control signal for controlling the temperature control means. A vehicle air conditioner characterized by: