JPH036488Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a starting control device for an auto air conditioner for automobiles in which the blowing mode is automatically controlled.

Conventional technology As a conventional auto air conditioner for automobiles, the fifth
A device that executes the control shown in the figure has been proposed (see Japanese Utility Model Application Publication No. 61327/1983). That is, in this control, the water temperature T _w of engine cooling water, which is the heat source of the air conditioner main body, is read, and it is determined whether or not the water temperature T _w has exceeded a predetermined lower limit value T _wp (for example, 40° C.). Then, T _w < T _wp and the water temperature T _w is
When the temperature has not reached 40℃, the blower motor rotation speed is set to extremely low speed LLO, and the air outlet is set to defroster mode DEF. This allows the defroster mode to remove fog from the windshield until the water temperature rises, and since the blower motor rotates at an extremely low speed (LLO), there is no inconvenience of cold air hitting the occupants' faces. Next, when T _w >T _wp due to a rise in the temperature of the engine coolant, the Tefro star mode is switched to the heat mode, and the blower motor is switched to the low rotation LO, which is higher rotation than the very low rotation speed LLO. Therefore, since the temperature of the engine cooling water, which is the heat source, is already over 40°C at this time, cold air will be blown out to the feet of the occupants, as if the ignition switch was turned on and then immediately set to heat mode. The inconveniences that give pleasure are eliminated. When the foot outlet temperature Td _L in the heat mode reaches a predetermined reference value Td _Lp , a normal basic control mode based on other temperature-related physical environmental factors is executed thereafter.

Problems to be solved by the invention However, in such conventional control, as shown in the characteristic diagram, the water temperature T _w is lower limit value T _wp
When reaching the rise, it instantly enters defroster mode
The mode is switched from DEF to heat mode HEAT, and the blower motor rotates at extremely low speed.
The rotation increases from LLO to low speed rotation LO. For this reason, by switching the mode, the cold air that had accumulated in the foot duct, which serves as the ventilation path during the heat mode, is blown out instantaneously, and the cold air causes physical discomfort, and the blower motor is instantaneously blown out. As the rotational speed increases, changes in rotational noise and air blowing noise can be perceived noticeably, resulting in audible discomfort.

The present invention was developed in view of these conventional problems, and is an automotive auto that makes it possible to comfortably start heating without causing the above-mentioned bodily discomfort and auditory discomfort. The object of the present invention is to provide a starting control device for an air conditioner.

Means for Solving the Problems In order to solve the above problems, the present invention includes the following:
A detection means that detects a physical environmental factor related to temperature and outputs it as an electric signal, a setting means that sends out an electric signal according to a setting operation by a passenger to set the temperature inside the vehicle, and an operation element related to temperature. a drive device that drives the drive device; and an arithmetic control device that performs calculations to create an optimal environment in the vehicle interior based on the output signals of the detection means and the setting device, and sends command signals to the drive device based on the results of the calculations. In the automatic air conditioner, the detection means includes a water temperature sensor that detects the temperature of engine cooling water that is the heat source of the air conditioner main body, a lower outlet temperature sensor that detects the temperature of the outlet to the passenger's feet, and a temperature sensor that detects the temperature of the upper part of the passenger compartment. The driving device has at least an upper room temperature sensor that detects the air temperature, and the drive device includes a blowout mode actuator linked to a door that selects a blowout port of the air conditioner, and a motor that drives a blower motor that controls the amount of air blown from the blowout port. It has at least a control circuit, and the arithmetic and control device is configured to execute the following control when it is determined to start in heat mode based on the upper room temperature signal output from the upper room temperature sensor.

(1) While the water temperature is determined to be lower than the lower limit value (for example, 40°C) based on the water temperature signal output by the water temperature sensor, the mode actuator forms the defroster mode and the motor control circuit is in the defroster mode. A command signal is sent to operate the blower motor at a very low speed.

(2) When it is determined that the water temperature has risen to the lower limit value based on the water temperature signal output by the water temperature sensor, the mode actuator is set in advance or based on a rate of change calculated from external conditions. A heat mode is formed from the defroster mode, and the motor control circuit sends a command signal so that the motor control circuit changes over time from the very low speed rotation to a higher speed low speed rotation based on the same rate of change.

(3) After that, when it is determined that the foot outlet temperature has risen to the reference value based on the outlet temperature signal output by the foot outlet temperature sensor, a command signal is sent so that the motor control circuit operates according to the basic control mode. In the configuration described above, when the arithmetic and control unit determines that the engine should be started in heat mode, the control in (1) above is executed first, and under conditions where the water temperature is lower than the lower limit, each door of the air conditioner body is closed. It is driven in defroster mode, and the blower motor rotates at an extremely low speed to blow a minute amount of air. Therefore, the cold air does not hit the occupant's face, and the windshield is defogged in the meantime.

Next, when the water temperature rises to the lower limit value, execution of the control described in (2) above is started, and the defroster mode changes to the heat mode at the above rate of change, and the blower motor rotates at an extremely low speed at the same rate of change. From this point onwards, the rotation speed changes to a higher speed and lower speed.
Therefore, in the heat mode, a small amount of the cold air that had accumulated in the duct, which serves as the air blowing path, is blown out from the air outlet, and the cool air that remains in the duct before being blown out is released as the blower motor rotates. It mixes with the warm air that is fed in and the temperature rises. On the other hand, the amount of change in blowing noise and rotational noise accompanying the increase in rotation of the blower motor per unit time is so small that it is not audibly noticeable.

When the foot outlet temperature rises and reaches the reference value as time passes from the start, the motor control circuit is controlled according to the basic control mode stored in advance in the arithmetic and control unit.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 2, the air conditioner main body 1 is constructed by sequentially connecting a blower unit 5, a cooling unit 6, and a heater unit 7, which are separated by casings 2, 3, and 4, respectively. The blower unit 5 has an outside air inlet 8 formed in the peripheral wall, an inside air inlet 9 facing opposite to each other,
A pair of intake doors 11, 1 that open and close with 10.
2, and a fan 14 whose driving source is a blower motor 13. An evaporator 20 of a vapor compression refrigeration cycle is disposed within the cooling unit 6, and an inlet tank 15a and an outlet tank 15 are disposed on both sides of the heater unit 7.
A heater core 16 that uses engine cooling water as a heat source is disposed.

This heater unit 7 is of a so-called two-layer flow type, and the heater core 16 is disposed horizontally along the flow direction of the air fed by the fan 14, and is located on the upstream side of the heater core 16. An upstream air guide 18 that divides the ventilation surface 17 into two, and a downstream air guide 21 that divides the downstream ventilation surface 19 into two are provided. The upstream air guide 18 extends in the upstream direction along one side wall 22 of the casing 4, defines a first introduction path 23 between it and the upstream ventilation surface 17, and defines a first introduction path 23 between it and the one side wall 22. 2nd introduction path 2
4. A first bypass path 2 is provided between the outlet tank 15a and the other side wall 25 of the casing 4.
A second bypass passage 28 is formed between the introduction tank 15 and the rear wall 27 of the casing 4.
is formed. A first air mix door 30, which is an operating element for opening and closing the first introduction passage 23, is provided on the boss portion 29 formed on the outlet tank 15a, and a first air mix door 30, which is an operating element for opening and closing the first introduction passage 23, is provided at the upstream end of the first bypass passage 26. In collaboration with Air Mix Door 30,
A vent bypass door 31 is provided to open and close the first bypass passage 26, and the introduction tank 15
A second air mix door 32, which is an operating means for opening and closing the second bypass passage 28, is provided at the end edge of the second air mix door 32.

A first air mix chamber 33 and a second air mix chamber 34 are provided on both sides of the downstream air guide 21. . The first air mix chamber 33 includes a defrost outlet 35 facing the front window, a center ventilator outlet 36 located in the center of an instrument panel disposed in the vehicle interior, and side vents located on both sides. The ventilator outlets 37 and 37 are in communication with each other, and the side ventilator outlet 3
A ventilation control door 38 is provided between 7 and 37. At the downstream end of the first air mix chamber 33, each of the ventilator outlets 36, 3 is provided.
A ventilator door 39 that opens and closes 7 and 37;
A defrost door 40 that opens and closes the defrost outlet 35 is provided. On the other hand, a foot outlet 41 provided at the lower part of the vehicle interior is communicated with the second air mix chamber 34 via a foot duct 44, and a lower outlet temperature sensor 45 is disposed inside the foot duct 44. , foot outlet 4
A foot door 42 is provided to open and close the air mix chamber 1, and a bypass door 43 is provided at a portion where the first and second air mix chambers 33 and 34 communicate with each other.

On the other hand, as shown in FIG.
A room temperature setting device 47, which is a setting means, is connected to the input port of
is connected to the outside air temperature sensor 48, which also serves as a detection means.
The solar radiation sensor 49, the upper room temperature sensor 50, the lower room temperature sensor 51, the lower outlet temperature sensor 45, and the water temperature sensor 52 that detects the engine cooling water temperature are connected to the A/
It is connected via a D converter 53. The arithmetic and control unit 46 also receives the set temperature T _s input from the room temperature setting device 47 , the outside temperature T _a detected by the outside temperature sensor 48 , and the amount of solar radiation Z detected by the solar radiation sensor 49 .
A standard blowout mode calculation circuit 54 is provided which calculates a standard blowout mode M _spb based on the set temperature T _s and the outside air temperature T _a .
An upper target temperature calculation circuit 55 and a lower target calculation circuit 56 are provided to calculate T _spu and lower target temperature T _SOL , respectively. The reference blowing mode calculation circuit 54
The output stage includes the lower room temperature T _L in the vehicle interior detected by the lower room temperature sensor 51, the lower outlet temperature T _dl which is the air volume blown out from the foot outlet 41 detected by the lower outlet temperature sensor 45, and the water temperature sensor. Based on the water temperature W detected by 52, the standard blowout mode M _spb
A blowout mode correction calculation circuit 58 is provided which calculates the rate of change from the defroster mode to the heat mode when the mode is the heat mode, and outputs the calculation result to the drive device 57. The output stage of the drive circuit 57 includes a ventilator door actuator 59, which is a drive device linked to the ventilator, defrost, and foot doors 39, 40, and 42;
A defrost door actuator 60, a foot door actuator 61, and a vent bypass door actuator 62 linked to the vent bypass door 31 are provided.

The output stages of the upper target temperature calculation circuit 55 and the lower target temperature calculation circuit 56 have an upper target temperature T _spu ,
a reference air volume calculation circuit that calculates a reference air volume V spb corresponding to the reference air blowing mode M _spb based on the lower target temperature T _SOL , the upper room temperature T _U and the lower room temperature T _L in the vehicle interior detected by the upper room temperature sensor ₅₀ ; 63 are provided. The output stage of the reference air volume calculation circuit 63 includes, like the blowout mode correction calculation circuit 58,
Air volume correction calculation circuit 6 that calculates the rate of change in air volume when switching from defroster mode to heat mode
4, and a drive circuit 65 for supplying an applied voltage to the blower motor 13 according to the result of this calculation is provided at the output stage of the air volume correction calculation circuit 64.

Next, the operation of this embodiment will be explained according to the flowchart shown in FIG. That is, when an air conditioning switch (not shown) is turned on, the arithmetic and control unit 46 is activated together with the air conditioner main body 1, and the physical environmental factors related to temperature, such as the outside temperature T _a , the amount of solar radiation Z, the upper room temperature T _U , and the lower room temperature T _L , lower outlet temperature T _dl , water temperature T _w ,
Each electric signal of the set temperature T _S and the set temperature T _S set by the occupant operating the room temperature setting device 47 is read (step), and the interior of the vehicle is set at the set temperature T _S based on these values. The upper target temperature T _SOU and the lower target temperature T _SOL required for this are calculated (step). In the next step, a standard airflow mode _Mspb that can more quickly achieve the upper and lower target temperatures T _SOU and T _SOL is calculated, and an appropriate standard air volume V _spb is calculated in the standard airflow mode M _spb . Calculated. In the next step, T _U > T _SOU −5 is determined, and this determination is YES.
In other words, if the current upper room temperature T _U is greater than the upper target temperature T _SOU minus 5°C and the upper part of the vehicle interior is hot, it is determined (step) that T _L > T _SOL , and this result is NO. That is, if the lower room temperature T _U is lower than the lower target temperature T _SOL , a further step is determined. In this step, it is determined whether or not the water temperature T _W has risen to the lower limit of 40°C, and if it has not reached 40°C, it is clear from the determination in the step described above that the upper part of the passenger compartment is high temperature. The vent mode is selected (step). This allows the ventilator door 3
9 and the vent bypass door 31 are driven to the open position, and both the defrost and foot doors 40 and 42 are driven to the open position, and the blower motor 13 receives 5.5V, which is a value between 4V for ultra-low speed rotation and 6V for low speed rotation. applied (step). Therefore, until the water temperature T _W reaches 40°C, the center ventilator outlet 36 and
Air is blown from the side ventilator outlets 37, 37 toward the upper part of the vehicle interior. and water temperature T _W
If the temperature rises by 40℃ (step determination is NO) or the lower room temperature T _L is higher than the lower target temperature T _SOL (step determination is YES), discomfort caused by cold air being blown at the feet. Since there is no risk of this occurring, there is no need to correct the standard blowout mode M _spb or the standard air volume V _spb , and the standard control mode consisting of the standard blowout mode M _psb and the standard air volume V _spb is executed (step).

On the other hand, if the determination in the step is NO and the upper room temperature T _U is lower than T _SOU -5, it can be determined that the reference blowing mode calculated in the previous step is the heat mode. Therefore, before starting the heat mode, it is determined whether or not the water temperature T _W has risen to 40℃ (step).
If the temperature has not reached ℃, a defroster mode is established, and the voltage applied to the blower motor 13 is set to 4V, which causes the blower motor to rotate at an extremely low speed (step). As a result, the defrost door 40 is driven to the open position, the foot door 42, the ventilator door 39, and the vent bypass door 31 are driven to the closed position, and the blower fan 14 rotates at a very low speed. Therefore, there is no chance of cold air hitting the passenger's face.
Furthermore, the fog on the windshield is removed by effectively utilizing the period until the water temperature T _W reaches 40°C. When the water temperature T _W rises to 40°C and the step determination becomes YES, the lower outlet temperature T _dl (However, in this case, the foot outlet 41 is open, so the lower outlet temperature T _dl is equal to the foot outlet 41 (step) If this determination is YES, the basic control mode is executed (step) in the same way as the processing in the step described above. On the other hand, the determination of the step is NO.
If the lower blowout temperature T _dl is 35° C. or lower, the timer t built in the blowout mode correction calculation circuit 58 and the air volume correction calculation circuit 64 is activated.
(step), and the set time T of the timer t is calculated as T = T _A + B _L (where T _A , B = constant), and therefore the set time T depends on the lower room temperature T _L. value (step). In the next step, at the operating time T,
Control for mode switching from defroster mode to heat mode with a constant rate of change, and blower motor 1
Control is performed synchronously to change the applied voltage of No. 3 from 4V, which is a very low speed rotation, to 6V, which is a low speed rotation. Therefore, a minute amount of the cold air that had accumulated in the foot duct 44, which did not function as an air passage in the conventional defroster mode but was used as an air passage in the heat mode, was released from the foot air outlet 41 at the beginning of the set time T. A large amount of cold air that is blown out and remains in the foot duct 44 mixes with the warm air that is fed as the blower motor 13 rotates, and its temperature increases. Therefore, at the beginning of the set time T, the amount of cold air blown out does not cause discomfort, and as the set time T elapses, although the amount of air blown increases, the blown temperature remains the same as described above. This does not arouse any discomfort, and therefore the defroster mode is switched to the heat mode without any discomfort. On the other hand, since the amount of change in the blowing noise and rotational noise caused by the increase in rotation of the blower motor 13 during the set time T is minute, it becomes difficult to audibly discern changes in the noise, which inevitably causes audible discomfort. Never.

The lower outlet temperature T _dl , which changes moment by moment through the processing of this step, is determined by the lower outlet temperature sensor 45.
The loop of steps is repeated until the lower outlet temperature T _dl becomes 35° C. or higher (YES in step) or until the set time T elapses. Therefore, even before the set time T has elapsed, if the lower outlet temperature T _dl becomes 35° C. or higher, the timer t is reset (step). Also, at this point, the lower blowout temperature T _dl has risen and the cold air does not cause physical discomfort, so the basic control mode is executed (step). On the other hand, when the set time T has elapsed and the step determination becomes YES, the heat mode is fixed and the voltage applied to the blower motor is fixed at 6V (step). At this time, the lower outlet temperature T _dl is
If the temperature is below 35℃, the loop of steps , , and so on is repeated. Then, when the lower blowout temperature T _dl reaches 35° C. or higher, the basic control mode is executed in the step as described above.

In addition, in this example, -5 in each discrimination step
The real values such as ℃, 35℃, 40℃, 4V, 5.5V, 6V, etc. are examples, and these values can be set as appropriate according to the characteristics of the air conditioner main body 1 and the cabin volume. Also, in this embodiment, since the set time of timer t is calculated in steps, the change from defroster mode to heat mode is determined by the T value as the calculation result, as shown by the dotted line in Fig. 4. The rate of change and the rate of change from ultra-low speed rotation LLO to low speed rotation L _p are different, and this change rate can be optimized in relation to the aforementioned discomfort, and of course it is also possible to make the change rate a constant value. It is.

Effects of the Invention As explained above, in the present invention, when the arithmetic and control unit determines to execute startup in heat mode, under conditions where the temperature of the water serving as the heat source is lower than the lower limit value, the present invention first forms the defroster mode, and then In addition to forming the heat mode, switching from the defroster mode to the heat mode and synchronizing with this, increasing the rotation of the blower motor from ultra-low speed rotation to low speed rotation are performed over time based on a predetermined rate of change. Therefore, in the heat mode, the cold air that had accumulated in the duct that serves as the ventilation path is blown out instantaneously, causing physical discomfort, and the blower motor speeds up instantaneously, causing rotational noise and noise. Changes in air blowing noise are clearly audible and comfortable starting control is possible without causing auditory discomfort.

In addition, in the embodiment described above, since the rate of change is variably set from the value of the arithmetic expression using physical environmental factors (step), the rate of change can be determined in relation to discomfort. This makes it possible to achieve even more optimal results.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
Fig. 2 is a conceptual diagram showing the main body of the air conditioner of the same embodiment;
FIG. 3 is a flow chart showing the operation of the same embodiment;
FIG. 4 is a control characteristic diagram of the same embodiment, and FIG. 5 is a control characteristic diagram of a conventional auto air conditioner for automobiles. 1...Air conditioner main body, 13...Blower motor,
35... Defrost outlet, 40... Defrost door, 41... Foot outlet, 42... Foot door, 44... Foot duct, 45... Lower outlet temperature sensor, 46... Arithmetic control unit, 47... Room temperature setting 50... Upper room temperature sensor, 52... Water temperature sensor, 60... Defrost door actuator, 61... Foot door actuator.

Claims (1)

[Scope of utility model registration request] A detection means that detects a physical environmental factor related to temperature and outputs it as an electric signal, a setting means that sends out an electric signal according to a setting operation by a passenger to set the temperature inside the vehicle, and an operation element related to temperature. and an arithmetic control device that performs calculations to create an optimal environment in the vehicle interior based on the output signals of the detection means and the setting means, and sends command signals to the drive apparatus based on the calculation results. In the automatic air conditioner, the detection means includes a water temperature sensor that detects the temperature of engine cooling water, a lower footwell outlet temperature sensor that detects the temperature of the outlet to the footwells, and an upper room temperature sensor that detects the temperature of the upper part of the passenger compartment. the drive device has at least a blowout mode actuator that drives a door that selects an air blowout port, and a motor control circuit that drives a blower motor that controls a blowout air volume; When it is determined to start in heat mode based on the upper room temperature signal output by the sensor, (1) while the water temperature is determined to be lower than the lower limit based on the water temperature signal output from the water temperature sensor; The mode actuator sets the defroster mode, and the motor control circuit sends out a command signal to operate the blower motor at a very low speed; (2) the water temperature is adjusted according to the water temperature signal output from the water temperature sensor; When it is determined that the temperature has increased to the lower limit value, the mode actuator forms a temporal heat mode based on a predetermined rate of change, and the motor control circuit generates a slow heat mode over time based on the predetermined rate of change. Sends a command signal to rotate,
(3) After that, when it is determined that the foot outlet temperature has risen to the reference value based on the outlet temperature signal output by the foot outlet temperature sensor, a command signal is sent to the motor control circuit to operate according to the basic control mode. A starting control device for an auto air conditioner for an automobile, characterized in that it sends out the following: