JP2526977B2 - Automotive air conditioner - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a vehicle air conditioner equipped with a mechanism for switching the outlets during cool-down or warm-up.

[Prior Art] In an automobile air conditioner, for example, when the vehicle is parked under the hot sun in the summer for a long time, the cooling and heating capacity is still insufficient at the time of start-up, and therefore the cooling command is issued. Also, a mechanism (cool-down mechanism) is provided so as to stop blowing air and not give an occupant an uncomfortable feeling.

Also, in the same way as in the case of winter morning, when the heating capacity cannot be fully exerted at startup, even if heating is instructed, a mechanism that stops blowing air (warm-up mechanism)
Is provided.

Conventionally, among such mechanisms, as a cool down mechanism, only the compressor is activated without activating the blower, and the blower is activated when a predetermined time elapses by the timer relay circuit so that the cool air is in front of the driver's seat. It is blowing from the vent outlet.

On the other hand, as a warm-up mechanism, a water temperature sensor is provided in the heater hose communicating with the heater core, and when the temperature of the water temperature sensor exceeds a predetermined value, the blower is activated to blow warm air from the heater outlet.

[Problems to be Solved by the Invention] However, in the above conventional air conditioner, since the cool-down mechanism and the warm-up mechanism are independently configured, the configuration is complicated and the cost is increased. There was a problem.

Further, in the former device, since the start of the blower motor is controlled by time, the air conditioner may be air-conditioned in a state where sufficient cold air cannot be obtained, which may still give an occupant a discomfort.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an automobile air conditioner with a simple configuration that does not cause occupants to feel uncomfortable due to air conditioning during cool down or warm up. With the goal.

[Means for Solving the Problem] As shown in FIG. 1, the vehicle air conditioner according to the present invention, which has been made to achieve the above object, uses a heater M2 and a cooler M3 to blow the air blown by a blower M1. An air mixing means M4 for exchanging heat to mix cold air and warm air, and a switching means M8 for guiding the air blown from the air mixing means M4 by switching to the defroster outlet M5, the vent outlet M6 and the heater outlet M7. Air-conditioning state detection means M8 to detect the operating state of the air-conditioning system
Based on the signal from the air conditioning state detection means M9, a cooling / heating control that determines a control command for various air conditioners such as a cool-down control that blows out cool air from the vent outlet M6 and at least a warm-up control that blows out warm air from the vent outlet M6 An air conditioner for a vehicle comprising a determination means M10 and a control means M11 for controlling the blower M1, the air mixing means M4 and the switching means based on the determination result of the cooling / heating determination means M10, the air mixing means M4 and the switching means An outlet temperature detecting means M12 provided in the passage between the M8 and the ventilating temperature detection means M12.
When the cooldown control is determined by the cooling / heating determination means M10, it is determined whether or not the blowout temperature is equal to or higher than a predetermined temperature by the detection signal from the blowout temperature detection means M12.
When the temperature is equal to or higher than a predetermined temperature, the first switching command means M13 for instructing the control means M11 to switch to the heater outlet M7 and the above-mentioned blow-out temperature detection when the cooling / heating determination means M10 determines warm-up control A second switching command means M14 for judging whether or not the blowout temperature is lower than or equal to a predetermined temperature based on the detection signal from the means M12, and instructing the control means M11 to switch to the defroster outlet M5 when the temperature is below the predetermined temperature. The summary is that

[Operation] In the air conditioner of the present invention, the signal from the air conditioning state detecting means M9 is input to the cooling / heating determining means M10, various air conditioning commands are determined / output, and the blower M1, the air mixing means M4, and the control means M11, The switching means M8 is controlled. Therefore, the wind of which the strength is adjusted by the blower M1 is heat-exchanged by the blower M1 by the heater M2 and the cooler M3 of the air mixing means M4, and the defroster outlet M by the switching means M8.
7, vent outlet M6 and heater outlet M7 are appropriately selected and blown out.

As described above, in the present invention, the cooling / heating determination means M10 performs various air conditioning control based on the signal from the air conditioning state detection means M9. For the control, the cool air blown out from the vent outlet M6 is cooled. Down control and warm-up control that blows warm air at least from vent outlet M6 are also performed.

However, even when the cool-down control is commanded by the cooling / heating determination means M10, when the blow-out temperature detected by the blow-out temperature detection means M12 is equal to or higher than the predetermined temperature, the first switching instruction means M13 controls the heater outlet. A command to select is output to the switching means M7 via the control means M11.

Therefore, even when the cool-down control command is output at the time of starting the air conditioner, etc., when the blown air is not sufficiently cold, the heater outlet that does not cause the passengers much discomfort. The wind blows from.

Further, even when the warm-up control is commanded by the cooling determination means M10, if the blowout temperature detected by the blowout temperature detection means M12 is equal to or lower than the predetermined temperature, the second switching instruction means
A command to select the defroster outlet M5 from M13 is output via the control means M11. In other words, the defroster outlet that does not cause occupants to feel uncomfortable due to cold air during heating and is effective in removing the fog on the windshield.
The wind blows from M7.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is a schematic configuration diagram showing an automobile air conditioner according to an embodiment of the present invention.

In the air conditioner of the present embodiment shown in FIG. 2, a ventilation duct 2 is arranged in the front part of a vehicle compartment 1, and inside and outside of the ventilation duct 2 the ratio of intake of inside air and outside air is changed in order from the intake port side. An air switching damper 3, a blower 4 that determines the amount of air taken into the vehicle interior 1, an air mixing unit 5 that has an evaporator 5a and a heater core 5b, and that determines the temperature of the air blown by the opening of the air mixing damper 5c. , A blower outlet switching damper 6 that switches the air blown into the passenger compartment 1 to the defrost outlet 1a, the vent outlet 1b, and the heater outlet 1c, and a vent that further switches the vent outlet 1b and the heater outlet 1c.
The heater switching damper 7 is attached. The inside / outside air switching damper 3, the blower 4, the air mix unit 5, the outlet switching damper 6 and the heater / vent switching damper 7 are respectively an inside / outside air switching actuator 8, a blower motor 9, an air mixing unit driving unit 10, and an outlet switching. It is configured to be driven by the actuator 11 and the vent / heater switching actuator 12. The air mix drive unit 10 includes a compressor 10a connected to the evaporator 5a, a water valve 10b provided in a pipe for circulating engine cooling water to the heater core 5b, and an opening degree of the air mix damper 5c. Valve drive unit for adjustment
Equipped with 10c.

Further, these actuators and drive units are connected so as to receive signals from various sensors and various switches, which will be described later, and be controlled by the electronic control unit 50.

As the sensor, the inside air sensor 31, which detects the temperature inside the room, the solar radiation sensor 33, which detects the amount of solar radiation, the outside air sensor 35, which detects the outside air temperature, the evaporator outlet temperature sensor 39, which detects the temperature of the cool air from the evaporator 5a, the air. An opening sensor 41 for detecting the opening of the mix damper 5c, and an outlet temperature sensor 43 for detecting the outlet temperature provided in the ventilation duct 2 between the air mix section 5 and the outlet switching damper 6 are provided. . The output signal of each sensor is input to the electronic control unit 50.

A control panel provided in the passenger compartment 1 has a temperature setting device for setting the temperature inside the vehicle to a desired temperature.
51 and a mode setter 53 including a switch for switching to various modes, for example, an automatic mode or a manual mode, a switch for manually switching the outlet switching damper 6, and the like.
Are provided, and these set values are input to the electronic control unit 50 as digital signals. The electronic control unit 50 is activated by a signal from a key switch 55 (ignition switch).

The electronic control unit 50 controls the various actuators by calculating based on the detection signal of the sensor and the signal of the switch described above and outputting a command signal. The electronic control unit 50 is composed of a well-known microcomputer including a CPU, a ROM, a RAM, an input / output interface and the like.

The control operation by the air conditioner is arithmetically processed according to the control program stored in the ROM, that is, the blower 4 switches the air volume based on the detection signal of various temperature data and the sensor detection value, and the air mix damper. 5c
The room temperature is automatically controlled by executing switching of the opening degree and the blowing port. Furthermore, in this air conditioner, the outlets are switched according to the outlet temperature in the cool-down control and the warm-up control at startup. The switching control of the air outlet is executed according to the flowchart of FIG.

After the air conditioner is started and various initialization processing is performed,
First, step 100 is executed. In step 100, detection values of various sensors such as the inside air sensor 31 and the blow-out temperature sensor 43, switch setting values, and the like are read. In the following step 105, a calculation process is executed as to under what conditions the air conditioner should be controlled based on the detection value read in step 100, the set value and the data stored in advance in the ROM 99, and then step 110 Proceed to. In step 110, the blower motor 9 or the like is activated to perform cooling or heating based on the calculation result. In the following step 115, it is determined by the arithmetic processing executed in step 105 whether or not the command for the cool down control is output, that is, whether or not it is in the command range for blowing the cool air from the vent outlet 1a. Is determined, and if the determination is negative, step 120
Move to In step 120, it is judged whether or not the warm-up control command is output based on the calculation result of step 105, that is, the vent outlet 1b and the heater outlet.
It is determined whether or not warm air is instructed from both 1c. If it is determined in step 120 that the warm-up control has not been commanded, the routine proceeds to step 125, where normal air conditioning control is executed.

On the other hand, if it is determined in step 115 that the cool-down control is instructed, the process proceeds to step 130, and it is determined whether or not the blowout temperature Tm is equal to or lower than a predetermined temperature Tc (for example, 10 ° C.), that is, It is determined whether or not the air blown out from the air mix unit 5 has been cooled to a predetermined temperature or lower. Here, if it is determined that the wind is sufficiently cold, the normal air conditioning control of step 135 is performed, while
That is, if it is determined that the wind is not sufficiently cold, the process proceeds to step 140. In step 140, the heater outlet 1c
And the blower motor 9 is set to Lo (weak wind).

That is, when the air blown at the time of starting the air conditioner is not sufficiently cooled, steps 100 to 115, step
130 and step 140 are repeatedly executed, and when the temperature is sufficiently low, the process proceeds from step 130 to step 135 to shift to normal air conditioning.

As a result, even if the cool-down control command is satisfied when the air conditioner is started, etc., when the blown air is not sufficiently cool, a weak cold air blows out from the heater outlet 1c. To be done. Therefore, since only a weak cold air is blown from the heater outlet 1c, the occupant is not so discomforted. Note that the above step 140
The blower motor 9 is set to Lo in order to allow the blow-out temperature sensor 43 to accurately detect the blow-out temperature Tm.

On the other hand, when it is determined in step 120 that the warm-up control command is output, the process proceeds to step 150. In this step 150, the outlet temperature Tm is the predetermined temperature Tw.
(For example, 30 ° C.) or higher, that is, whether or not the air blown from the air mix unit 5 is warmed up to a predetermined temperature Tw or higher is determined. If it is determined that the temperature is sufficiently warm, the routine proceeds to step 125, where normal air conditioning control is performed.

On the other hand, if it is determined in step 150 that the intake air temperature Tm is lower than or equal to the predetermined temperature Tw, that is, if it is determined that the blown-out air is not sufficiently warmed, step 155
And the blower motor 9 is set to Lo (weak air) while switching to the defroster outlet 1a. That is, even if the warm-up condition is satisfied at the time of starting the air conditioner, if the blown air is not yet sufficiently warmed, steps 100 to 110, step 115, step 120, step 150, step 155 are repeated. When it is executed and is sufficiently warmed, the routine proceeds from step 150 to step 125, and normal air conditioning control is performed. The blower motor 9 is set to Lo at the time of warm-up in order to detect the blow-out temperature as at the time of cool-down.

By such control, since cold air is not blown out from the vent outlet 1b during heating, it does not give an occupant an uncomfortable feeling, and the gradually warming air is blown from the defroster outlet 1b to the windshield, so that it is cloudy. Is also effective in removing.

Therefore, according to the above-described embodiment, warm air is not blown from the vent outlet at the time of starting the air conditioner at the time of cool-down, and cold air is not blown at the time of warm-up, so that the passenger does not feel uncomfortable. Moreover, since the temperature of the blown air is adjusted by the blow-out temperature sensor 43, the air is blown even though it is not sufficiently cold or warm as compared with the time set by the conventional technique. Since it is not performed, more comfortable air conditioning can be obtained.

Further, in the above-described embodiment, it is not necessary to separately provide the two configurations of the cool-down mechanism and the warm-up mechanism as described in the prior art, so that the configuration is simplified and the cost can be reduced.

Further, as a modification of FIG. 3, it can also be executed by the flowchart of FIG. Since this process is performed only at the time of startup, the process of switching the outlets during the cool down control and the warm map control is performed.
The determination process is performed so that it is executed only once. First, after the process of reading the detected values of various sensors and the set values of switches (step 200) and the calculation process of air conditioning control (step 205) are executed, the flag F is determined (step 210). The flag F indicates whether or not the determination process for switching the outlets has been executed as described later. In the first process, the flag F is set to 0 by the initialization process. 215 Proceed to the migration process. In other words, as in step 115 of FIG. 3, it is determined whether or not the cool-down control is performed (step 220) and whether or not the warm-up control is performed (step 225). After setting the flag F to 1 (step 230), normal air conditioning control is performed. By setting this flag F1, the subsequent processing is
In the determination process of 210, steps 210 to 235 are repeated, and the normal air conditioner is operated.

On the other hand, when it is determined that the cool-down control is performed (step 220), and the blow-out temperature Tm is equal to or higher than the predetermined temperature Tc (step 240), switching to the heater outlet 1c and setting of the blower motor 9 to Lo are performed. When the blowout temperature Tm becomes equal to or higher than the predetermined temperature Tc (step 245), the flag F is set to 1 (step 250), and then the normal air conditioning control is performed (step 235).

Similarly, when it is determined to be warm-up control (step 225), if the blowout temperature Tc is not equal to or higher than the predetermined temperature Tw, switching to the defroster blowout port 1a and the blower motor 9 are performed.
When the temperature is set to Lo and becomes equal to or higher than the predetermined temperature Tw, the flag F is set and the normal air conditioning control is performed.

Therefore, this processing does not give an occupant an uncomfortable feeling due to cold air / warm air at the time of startup as in the embodiment shown in FIG. 3 and is performed only at the time of startup, so that the processing speed is increased.

[Effects of the Invention] As described above, according to the present invention, hot air is not blown out at the time of cooldown or cold air is not blown out at the time of warmup from the vent outlet when the air conditioner is started. Does not cause passenger discomfort. Moreover, since the temperature of the blown air is adjusted by the blown air temperature detection means, it is blown even though it is not sufficiently cold or warm as compared with the time set by the conventional technique. Since it does not occur, more comfortable air conditioning can be obtained.

Further, in the above-described embodiment, it is not necessary to separately provide the two configurations of the cool-down mechanism and the warm-up mechanism as described in the prior art, so that the configuration is simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an automobile air conditioner according to the present invention, FIG. 2 is a block diagram showing an automobile air conditioner according to an embodiment of the present invention, and FIG. 3 is a flow chart showing processing by the same embodiment. FIG. 4 is a flowchart showing a modified example of FIG. M1 ...... Blower, M2 ...... Heater M3 ...... Cooler, M4 ...... Air mix means M5 ...... Defroster outlet M6 ...... Vent outlet, M7 ...... Heater outlet M8 ...... Switching means, M9 ...... Air-conditioning state detection means M10 ... cooling / heating determination means, M11 ... control means M12 ... blowout temperature detection means M13 ... first switching command means M14 ... second switching command means 1a ... defroster outlet 1b ... Vent blowout port, 1c …… Heater blowout port 3 …… Blower, 5 …… Air mix section 5a …… Evaporator, 5b …… Heater core 6 …… Blowout port switching damper, 43 …… Blowout temperature sensor 50 …… Electronic control unit

Claims (1)

(57) [Claims] 1. An air mix means for exchanging the air sent by a blower with a heater and a cooler to mix cold air and warm air, and the air blown from the air mix means is a defroster outlet, a vent outlet and Switching means for switching and guiding to the heater outlet, air conditioning state detecting means for detecting the operating state of the air conditioner, and cooldown control for blowing out cool air from the vent outlet based on the signal of this air conditioning state detecting means, at least vent blowing Cooling / heating determining means for determining control commands for various air conditioners such as warm-up control for blowing warm air from the outlet, and the blower based on the determination result of the cooling / heating determining means,
An air conditioner for a vehicle, comprising: an air mix means and a control means for controlling the switching means, wherein the air mix means is provided in a passage between the air mixing means and the switching means.
When the cooldown control is determined by the blowout temperature detecting means for detecting the temperature of the ventilation and the cooling / heating determining means, it is determined whether or not the blowout temperature is equal to or higher than a predetermined temperature by the detection signal from the blowout temperature detecting means. First switching command means for instructing the control means to switch to the heater outlet when the temperature is equal to or higher than the predetermined temperature, and when the warm-up control is determined by the cooling / heating determination means, the blowout temperature detection means is used. And a second switching command means for instructing the control means to switch to the defroster outlet side when the temperature is below a predetermined temperature. Air-conditioning system for automobiles.