JP2835987B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle.

[0002]

2. Description of the Related Art Conventionally, in order to maintain the temperature in a vehicle cabin at a temperature set by a temperature setting device, an outside air temperature sensor, an inside air temperature sensor, an evaporator temperature sensor for detecting a temperature at an evaporator outlet, an engine water temperature sensor, and an air mixing door. An opening sensor is provided, and a target outlet air temperature is calculated based on the output of these sensors, and based on the calculation result, the position of the air mix door and the flow rate are controlled, whereby
2. Description of the Related Art There is known an automatic air conditioner for a vehicle in which air conditioning in a vehicle compartment can be automatically performed in accordance with the environment inside and outside the vehicle compartment (Japanese Patent Publication No. 59-19849). According to this configuration, an operation for adjusting a required temperature is promptly performed in response to a change in environmental conditions in a timely manner and adapted to the environmental conditions.

[0003]

Therefore, according to this conventional apparatus, for example, when the vehicle travels in a mountainous area, the altitude of the vehicle changes drastically due to rapid climbing and descending, and the outside air temperature greatly changes in a short time. The air conditioner responds accurately to this, and the temperature of the blown air changes greatly. However, the temperature inside the vehicle compartment is large because of the large heat capacity of the seats and other interior materials inside the vehicle compartment, so even if the outside temperature changes suddenly, the temperature inside the vehicle compartment does not change suddenly, so eventually heating or cooling becomes excessive, On the contrary, there is a problem that the occupant is uncomfortable. An object of the present invention is to provide an automatic air conditioner for a vehicle that can solve the above-described problems in the related art.

[0004]

In order to solve the above-mentioned problems, the present invention, as shown in the claim correspondence diagram of FIG. 1, comprises an outside air temperature detecting means for detecting an outside air temperature and other necessary heat load detection. Means. A detection output from the heat load detecting means is given to an adjustment control means for performing adjustment control of the blown air temperature. On the other hand, data indicating the outside air temperature detected by the outside air temperature detecting means is once inputted to the processing means. I have. The determination means is for responding to current position information on the current position of the vehicle output from, for example, a navigation system mounted on the vehicle, and determining whether or not the vehicle is in a place where the outside temperature changes rapidly. The determination result is given to the processing means. The processing unit responds to the determination result from the determination unit and processes the outside air temperature data so as to reduce the degree of influence on the control of the outside air temperature data only while the vehicle is in a place where the outside air temperature changes rapidly. Data relating to the processed or unprocessed outside air temperature output from the processing means is provided to the adjustment control means and considered for the adjustment control.

[0005]

When the determining means determines that the vehicle is located in a place such as an urban area where a sudden change in the outside air temperature due to the running of the vehicle is difficult to predict, the outside air temperature data passes through the processing means as it is.
It is directly reflected on the temperature control by the control means. As a result, when the temperature of the element for detecting the outside air temperature rises due to the exhaust heat of the engine when the vehicle is stopped or traveling at low speed due to traffic congestion, the vehicle moves to high speed traveling,
When the detection of the outside air temperature returns to a true value that is not affected by the exhaust heat of the engine, the temperature adjustment in the vehicle compartment is promptly executed in response to this immediately. On the other hand, if the determination unit determines that the vehicle is located at a place where the outside temperature is expected to change suddenly with the running of the vehicle for various reasons, such as a place where the altitude difference changes suddenly in the mountainous area, the transitional state is determined. In order to prevent excessive heating or excessive cooling, the processing means performs processing for reducing the degree of influence of the outside air temperature data obtained by the outside air temperature detection means on vehicle interior air temperature control, and the processing result is obtained. Data about the outside temperature is provided to the adjusting means. The adjusting means responds to the output from the heat load detecting means and the output from the processing means, and performs an adjusting control for maintaining the temperature in the vehicle cabin at a required value.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention.
The blower 3, the cooling unit 4 and the heater core 5 are arranged in the ventilation duct 2 as shown in the drawing. It is configured to be sent to the cooling unit 4.

[0008] An air mixing door 8 is positioned between the cooling unit 4 and the heater core 5 and operated by a door motor 7.
By adjusting the position of the vehicle, the ventilation duct 2 can be
The temperature of the air blown into can be adjusted.

The mechanism for switching the inside / outside air of the air taken in by the blower 3 and the mechanism for switching the direction of the air blown out from the ventilation duct 2 are well-known structures, and are shown in FIG. Omitted.

In order to control the blower motor 6 and the door motor 7 so that the temperature in the passenger compartment is maintained at the set temperature Tset set by the setter 10, the apparatus 1 includes a control system including a microcomputer 11. Is provided.

The control system will be described. In order to detect an environmental condition for air conditioning at that time, that is, a heat load condition, in addition to the setter 10, a room temperature Tr in the vehicle compartment is detected and a room temperature signal indicating the detection result is provided. A room temperature sensor 12 that outputs A, a solar radiation signal C that detects the amount of solar radiation Q and indicates the detection result
And an outside air temperature sensor 14 that detects outside air temperature Ta and outputs an outside air temperature signal D indicating the detection result.

The setter 10 outputs a set signal B indicating a desired set temperature Tset at that time, and these signals A, B, C and D are converted into analog / digital converters (A / D).
15, the digital data DA, DB, D
The data is converted into C and DD and input to the microcomputer 11.

In this embodiment, a sensor group consisting of a setting device 10, a room temperature sensor 12, and a solar radiation sensor 13 is shown in FIG.
And the outside air temperature sensor 14 corresponds to the outside air temperature detection unit in FIG.

Reference numeral 16 denotes a blowout temperature sensor for detecting the temperature Te of the cool air from the cooling unit 4, and outputs a blowout temperature signal E indicating the temperature of the cool air blown from the cooling unit 4. The blow-out temperature signal E is also converted into corresponding digital data DE by the analog-digital converter 15 and input to the microcomputer 11.

The operation panel 17 is provided with switches and the like (not shown) for performing various operations of the vehicle air conditioner 1. Operation data from various operation members provided on the operation panel 17 is provided. S is input to the microcomputer 11.

Reference numeral 18 denotes a navigation system mounted on the vehicle.
, The current position data N indicating the current position information on the current position of the vehicle and the terrain in the vicinity thereof is output and input to the microcomputer 11.

The memory 11A of the microcomputer 11
Has a control program stored therein, a control calculation according to the control program is executed based on data and signals input to the microcomputer 11, and the blower 3 and the air mix door 8 are controlled in accordance with the calculation result. The room temperature is controlled.

FIG. 3 is a functional diagram showing a control function realized by executing a control program stored in the memory 11A of the microcomputer 11.

The function diagram will be described.
In response to the current location data N, 1 determines whether or not the vehicle is in a location where the outside temperature changes abruptly as the vehicle travels, for example, in a mountain area, based on the terrain at the current location of the vehicle and the like, and shows the determination result. The determination data HD is output.

The discrimination data HD is sent to the processing section 22 to which the outside air temperature data DD indicating the outside air temperature Ta is input.
The processing unit 22 responds to the determination data HD and determines from the topography or the like of the current location of the vehicle. If the determination unit 21 determines that the vehicle is located in a place where the outside temperature changes suddenly as the vehicle travels, , Delay processing is performed on the outside air temperature data DD, and otherwise, no processing is performed on the outside air temperature data DD. The data relating to the outside air temperature thus obtained in the processing section 22 is output as processing data SD.

As shown in FIG. 4A, when the outside temperature Ta suddenly changes from P to Q, the delay processing does not immediately follow the value of the processing data SD but uses a predetermined predetermined value. Every time T elapses, the value is increased by a predetermined step amount ST. On the other hand, when the outside air temperature Ta suddenly changes from Q to P, similarly, the value is reduced by the predetermined step amount ST every time the predetermined time T elapses. is there. Therefore, the value of the processing data SD obtained as a result of delay processing of the outside air temperature data DD that changes as shown in FIG. 4A changes as shown in FIG. 4B.

If the determination unit 21 determines that the current position of the vehicle is not on the terrain where the outside temperature changes rapidly with the running of the vehicle, no processing is performed on the outside temperature data DD. Not done. Therefore, when the outside air temperature data DD changes as shown in FIG. 4A, the value of the processing data SD becomes exactly the same as the value of the processing data SD as shown in FIG.

The processing data SD is sent to a target outlet temperature calculator 23 to which room temperature data DA indicating a vehicle interior temperature, setting data DB indicating a set temperature Tset, and solar data DC indicating an amount of solar radiation Q are input. In order to maintain the vehicle interior at the set temperature indicated by the setting data DB,
The target blowing temperature value Xm of the required blowing air from the duct 2 is calculated according to a known calculation formula.

The target outlet temperature data F indicating the calculation result
Is sent to a first drive unit 24 that outputs a drive signal G for driving the blower motor 6. As a result, the blowing amount of the blower 3 is controlled so that the blowing amount necessary to obtain the calculated target blown air temperature Xm is obtained.

The target blow-out temperature data F is sent to the opening degree calculating section 25 to which the blow-out temperature data DE is inputted. Here, the air mix door 8 necessary to obtain the target blow-out air temperature value Xm is obtained. The opening is calculated. The opening data H indicating the calculation result is sent to the second drive unit 26 that outputs a door drive signal I for driving the positioning door motor 7 of the air mix door 8, where the opening data H is indicated by the opening data H. The door drive signal I required to obtain the air mix door opening is output.

According to this configuration, when the determination unit 21 determines that the current position of the vehicle is a place where it is difficult for the external temperature to suddenly change as the vehicle travels, based on the current location data N, the external temperature data Since the DD is directly output from the processing unit 22 as the processing data SD and is input to the target outlet temperature calculating unit 23, the change in the value of the outside air temperature data DD is directly used for the temperature adjustment control by the blower 3 and the air mixing door 8. Will be reflected.

As a result, when the temperature of the element for detecting the outside air temperature rises due to the exhaust heat of the engine when the vehicle is stopped or when the vehicle is running at low speed due to traffic congestion, the detection of the outside air temperature is detected by moving to a high speed operation. When the temperature returns to a true value that is not affected by heat, the temperature in the passenger compartment is promptly adjusted in response to this.

On the other hand, as when traveling in a mountainous area,
When the determination unit 21 determines that the current position of the vehicle is on a terrain where a sudden change in outside temperature is expected as the vehicle travels, the outside temperature data DD is subjected to delay processing, and the resulting data is processed data. It is given to the target outlet temperature calculating section 23 as SD. For this reason, the degree of influence of the outside air temperature data obtained by the outside air temperature sensor 14 on the vehicle interior air temperature control is reduced. As a result, even if the outside air temperature changes abruptly, the blow-off air temperature for adjusting the vehicle room temperature will change slowly, and it is possible to prevent transient heating or excessive cooling, and even in mountainous areas, etc. , Comfortable air conditioning can be performed.

FIG. 5 shows a flowchart of a control program stored in the memory 11A of the microcomputer 11 shown in FIG. 2 and performing the functions shown in the functional diagram of FIG.

The control program will be described.
After the start of the program, first, in steps 31 to 33, the operation signal S and the data DA to DE and N are read, and the read data is stored in a predetermined address of the memory 11A.

In step 34, the terrain of the current position of the vehicle is determined based on the current position data N. Next, in step 35, it is determined whether or not the terrain at the current location of the vehicle is such that the outside air temperature suddenly changes as the vehicle travels, such as a mountainous area.

If the vehicle is traveling in a mountain area or the like, the result of the determination in step 35 is YES, and in step 36 the delay processing described with reference to FIG. If the decision result in the step 35 is NO, the process enters the step 37 without executing the step 36.

In step 37, the target blow-off temperature value Xm is calculated. In step 38, the blower 3 is controlled based on the value Xm obtained in step 37.
Further, in step 39, the opening degree of the air mix door is controlled based on the value Xm obtained in step 37, and after other control is performed in step 40, the execution of this program ends.

[0034]

According to the present invention, since the degree of influence on the control of the outside air temperature data is changed according to the topographical condition of the current position of the vehicle, etc., the outside air temperature is controlled along with the running of the vehicle as in a mountainous area. Does not cause a problem that cooling or heating is excessive, even if the air conditioner changes drastically, it is possible to always perform comfortable air conditioning control.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims of the present invention.

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

FIG. 3 is a functional diagram showing functions obtained according to the operation of a control program executed in the microcomputer of FIG. 2;

FIG. 4 is an explanatory diagram for explaining an operation of a processing unit in FIG. 3;

FIG. 5 is a flowchart showing a control program executed in the microcomputer of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner for vehicles 3 Blower 8 Air mix door 10 Setting device 11 Microcomputer 12 Room temperature sensor 13 Solar radiation sensor 14 Outside air temperature sensor 21 Judgment part 22 Processing part 23 Target blowing calculation part N Current location data

Claims (1)

(57) [Claims] 1. An air conditioner for a vehicle, comprising an outside air temperature detecting means for detecting an outside air temperature, wherein the temperature of air blown into a vehicle compartment is controlled in consideration of the detected outside air temperature. A heat load detecting means for detecting a required heat load other than the outside air temperature; and a determination for determining whether or not the vehicle is located in a place where the outside air temperature suddenly changes as the vehicle travels in response to the current location information of the vehicle. Means, and responding to the determination means and the outside air temperature detecting means, and outputs the outside air temperature data output from the outside air temperature detecting means only when the vehicle is in a place where the outside air temperature suddenly changes as the vehicle travels. Processing means for performing processing so that the degree of influence on control is reduced; andadjustment control means for performing adjustment control of blown air temperature in response to the heat load detection means and the processing means. Characteristic air conditioning equipment for vehicles Place.