JP2938540B2 - Vehicle air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner for a vehicle, and more particularly to an air conditioner capable of automatically switching an air-conditioning air blowing mode.

(Prior Art) Conventionally, as an air conditioner for a vehicle, there has been known an air conditioner in which an air-conditioning air blowing mode is automatically switched according to an outside air temperature, a vehicle interior temperature, and the like.

For example, in the technology disclosed in Japanese Patent Application Laid-Open No. 62-299422, the air-conditioning air blowing mode is automatically switched with the rise of the engine cooling water temperature at the start of heating operation to prevent fogging of the windshield. In the meantime, the occupants get enough heating at their feet.

Further, at the start of the heating operation when the outside air temperature is below freezing (for example, -15 ° C.), the air-conditioning air blowing mode is set to the heat mode to promote an increase in the indoor temperature, and automatically when the vehicle interior temperature reaches a predetermined value. It is also known to switch to a heat / diff mode in order to maintain the room temperature and prevent fogging of the windshield.

(Problems to be Solved by the Invention) However, in the above-described conventional example, the mode is switched to the heat / diff mode when the temperature in the vehicle compartment reaches a predetermined value. The high temperature conditioned air is blown out, and the temperature around the occupant's head increases. For this reason, the occupant receives a feeling of warmth, and there is a problem that the occupant is uncomfortable. As described above, a comfortable air-conditioning state cannot be obtained only by switching the blowing mode as in the related art.

The present invention has been made in view of these points, and does not give an occupant an uncomfortable feeling during a heating operation when the outside air temperature is extremely low, and can reliably prevent fogging of a window glass. The aim is to obtain a harmony device.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, when the blowing mode is switched during the heating operation, the temperature of the conditioned air and the blowing amount are changed accordingly. .

Specifically, as shown in FIGS. 1 and 2, after the temperature of the air sucked into the air passage 1a by the blowing means 7 is adjusted at least by the heating means 9, the heat blowing port 14 and the defrost It is premised on a vehicle air conditioner that blows air from a plurality of air outlets having an outlet 12 into a vehicle interior. A heating adjusting means 10 for adjusting the amount of air introduced into the heating means 9; a mode switching detecting means 50 for detecting that the air-conditioning air blowing mode has been switched from the heat mode to the heat / diff mode; When the output of the detecting means 50 is received and the air-conditioning air blowing mode is switched from the heat mode to the heat / diff mode during the heating operation, the opening degree of the heating adjusting means 10 is reduced so that the amount of air introduced into the heating means 9 decreases. And a control means 51 for increasing the drive voltage of the blower 7 by a predetermined amount so as to increase the amount of air blown from the heat outlet 14 and the defrost outlet 12.

(Operation) In the present invention having the above-described configuration, when the air-conditioning air blowing mode is switched from the heat mode to the heat / diff mode during the heating operation, the control unit changes the opening of the heating adjustment unit by a predetermined amount to perform heating. While reducing the amount of air introduced into the means, the drive voltage of the blower is increased by a predetermined amount to increase the amount of air blown out from each outlet. As a result, the temperature of the conditioned air blown out from the defrost blow-off port is reduced, so that the occupant does not feel uncomfortable due to a head sensation. In addition, a decrease in the heating capacity due to a decrease in the temperature of the conditioned air can be compensated for by an increase in the amount of blown air.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 denotes an automotive air conditioner according to an embodiment of the present invention, which has an intake door switching device 2 at the most upstream side of an air passage 1a. This intake door switching device 2
Has an inside air inlet 3 and an outside air inlet 4, and each of these inlets 3, 4
An inside / outside air switching door 5 driven by an actuator 6 is arranged at a boundary portion of the inside and outside.
, The air to be introduced into the air passage 1a can be selected from inside air and outside air.

A blower 7 as a blower is provided at an upstream end of the air passage 1a. The blower 7 sucks air from each of the inlets 3 and 4 of the intake door switching device 2 and blows the air to the downstream side of the air passage 1a. The blowout airflow is adjusted according to the applied voltage. . An evaporator 8 is provided in the air passage 1a downstream of the blower 7.
Further, a heater core 9 as a heating means is disposed further downstream of the evaporator 8.

The evaporator 8 is connected to a compressor or the like (not shown) by a pipe to form a refrigeration cycle, and cools the air in the air passage 1a. The heater core 9 circulates cooling water with an engine (not shown) to heat the air. Immediately upstream of the heater core 9, an air mix door 10 as heating control means driven by an actuator 11 is provided. The air mix door 10 passes through the heater core 9 by adjusting the opening of the air mix door 10. The amount of air and the amount of air that bypasses the heater core 9 is adjusted, and as a result, the temperature of the blown air is controlled. The opening degree of the air mix door 10 is 0% when the air mix door 10 is positioned at a full cool position (shown by a phantom line in FIG. 2) in which all the air bypasses the heater core 9, and all the air is removed from the heater core. 9 through the full heat position (second
(Indicated by a solid line in the figure).

The downstream end of the air passage 1a is branched into a defrost outlet 12, a vent outlet 13, and a heat outlet.
It opens to the passenger compartment 15 through 14. In addition, each outlet 12 ~
The mode doors 16 to 18 are provided at the branch portions of the 14, respectively. By operating the mode doors 16 to 18 with the actuator 19, a desired blowing mode can be obtained. The vent outlet 13 is located on both the right and left center vent outlets disposed adjacent to the center in the vehicle width direction.
13a, 13b, a right side vent outlet 13c disposed on the right side in the vehicle width direction, and a left side vent outlet 13d disposed on the left end in the vehicle width direction. Further, a wind distribution door 17a driven by an actuator 20 is provided in a partition portion between the left and right center vent outlets 13a and 13b, and the air is blown out from the vent outlets 13a to 13d by the wind distribution door 17a. The distribution amount of the conditioned air is adjusted.

Further, the air conditioner 1 is provided with a bypass passage 21 that bypasses a part of the air passage 1a. That is, one end of the bypass passage 21 is located downstream of the evaporator 8 and upstream of the aerial door 10.
The other end is connected to the vent outlet 13 respectively.
A part of the air immediately after passing through the evaporator 8 can be directly supplied to the vent outlet 13 through the bypass passage 21. Further, a bypass door 22 driven by an actuator 23 is provided at an upstream end of the bypass passage 21, and the amount of cool air supplied to the vent outlet 13 via the bypass passage 21 is controlled by the opening of the bypass door 22. It can be adjusted by controlling the degree.

In FIG. 2, reference numeral 25 denotes a vehicle interior temperature sensor for detecting a representative temperature Tr in the vehicle interior, which is mounted on an instrument panel (not shown) or the like. 26 is an outside air temperature sensor for detecting the outside air temperature Ta, 27 is a door opening detecting means for detecting the opening of the air mixing door, and 28a and 28b are solar radiation sensors disposed on both left and right sides of the vehicle interior, respectively. Of solar radiation Ts at the disposition position is detected. And each of these sensors
The output signals of 25 to 27, 28a, and 28b are selected via a multiplexer 30, converted into digital signals by an A / D converter 31, and then input to a microcomputer 32.

Reference numeral 36 denotes a voltage detector for detecting a voltage applied to the blower 7. The output signal of the voltage detector 36 is also input to the microcomputer 32 via the multiplexer 30 and the A / D converter 31.

Further, the microcomputer 32 receives respective output signals from the control panel 37, the temperature setting unit 38, the head temperature setting unit 39, and the air volume distribution unit 40.

In the control panel 37, the blowing mode is set to VENT mode, BI-L mode, HEAT mode, HEAT / DEF mode or DE mode.
Mode switches 41a to 41e for manually setting to F mode
A / C switch 42 for operating the refrigeration cycle,
Fan switches 43a to 43c for switching the rotation speed of the blower 7 to low speed (FAN1), medium speed (FAN2) or high speed (FAN3); an auto switch 44 for switching all air conditioning devices such as the blower 7 to automatic control; And an off switch 45 for stopping the driving of the motor.

The temperature setting unit 38 includes an up switch 46a and a down switch 46b, and a display unit 47 that displays a set temperature,
By operating the up / down switches 46a and 46b, the display 47
Can be arbitrarily changed within a predetermined range.

The head temperature setting unit 39 includes a bypass switch 39a and an opening adjustment dial 39b. The bypass switch 9a is a push-button switch, and when a request to manually adjust the amount of cold air blown around the occupant's head is made, the switch is switched to the manual mode by pushing the switch 39 in. It has become. The opening adjustment dial 39b allows the opening of the bypass door 22 to be manually adjusted in a state where the bypass switch 39a is pushed and the manual mode is set. The temperature setting unit 38
The up / down switches 46a and 46b and the opening adjustment dial 39b may be of a type that slides a template bar.

And the air volume distribution unit 40 is a manual slide lever 40a.
By operating the slide lever 40a,
By adjusting the opening of the air distribution door 17a, each vent outlet 13a ~
The distribution amount of the conditioned air in 13d is adjusted.

The microcomputer 32 has a CPU, a RAM, a ROM, and the like (not shown). The microcomputer 32 includes a drive circuit 48a for each of the actuators 6, 11, 19, 20, and 23 and the motor of the blower 7 based on the various input signals described above. A control signal is output through .about.48f to control the drive of each door 5, 10, 16, 17, 18, 17a, 22 and the rotation of the motor.

Next, control of the blower voltage and the air mix door opening during the heating operation of the microcomputer 32 will be described with reference to the flowchart shown in FIG.

In this control, as shown in FIG. 3, after started, it calculates the opening degree of the air mixing door 10 in step S ₁ cabin temperature, outside temperature, reads various signals solar radiation, etc., in step S ₂ , Set. Step S ₃
Calculates and sets the drive voltage of the blower 7 in
In step S ₄ to set the blow-out mode of the conditioned air. Then, it is determined whether or not after setting the respective air conditioning operation state, the air outlet mode is set in step S ₄ proceeds to step S ₅ is a heat / defrost mode. Thus, this step S ₅ mode switching detection means 50 is constituted.
When the air outlet mode is YES heat / defrost determines whether the activation state of the heating operation proceeds to step S _6. Here, for example, the heating operation activation state is determined based on whether or not a predetermined time (for example, 5 minutes) has elapsed from the start of the heating operation. And here with the case of YES is activated state of the heating operation sets the correction amount Δθ of the air mixing door opening proceeds to step S ₇ to a predetermined value alpha, a predetermined value correction amount ΔV of the blower voltage β Set to. Thereafter, the process shifts to step S _8, the correction amount Δθ from the opening of the air mix door 10 which is set in step S ₂
By reducing the opening degree, the opening of the air mix door 10 is reduced, and the temperature of the conditioned air blown out from the defrost outlet 12 and the heat outlet 14 is slightly reduced. Accordingly, the control unit 51 in the present invention by the step S ₈ is formed. As a result, the temperature of the conditioned air blown out from the defrost air outlet 12 decreases, so that the temperature around the head of the occupant does not increase, and the occupant does not feel discomfort due to the feeling of head heat. Also, increasing the air volume blowing by adding the correction amount ΔV in the drive voltage of the blower 7 which is set in step S ₃ with this operation. This makes it possible to compensate for a decrease in the heating capacity due to the above operation, that is, a decrease in the opening degree of the air mix door 10.

On the other hand, in step S _5, when the blowing mode of the air conditioning air or if it is determined not to be heat / defrost mode, it is determined not to be the heating operation start state at step S _6, the air mixing shifts to step S ₉ change 0 both the correction amount ΔV of opening correction amount Δθ and the drive voltage of the blower 7 of the door 10, the opening and the driving voltage of the blower 7 of the air mix door 10 which is set in step S ₂ and step S ₃ Perform air-conditioning operation without doing.

Next, a heating operation of the air conditioner 1 will be described.

For example, during the heating operation at an outside air temperature of -15 ° C,
With the auto switch 44 on the control panel 37 pressed down, the set temperature Tset set by the temperature setting unit 38, the vehicle interior temperature Tr detected by the vehicle interior temperature sensor 25, and the external temperature sensor 26 detect Outside air temperature
Ta, solar radiation Ts detected by solar radiation sensors 28a, 28b
And the like are input to the microcomputer 32 via the multiplexer 30 and the A / D converter 31, whereby the target temperature is determined. The microcomputer 32 outputs a control signal to each of the drive circuits 48a to 48f in accordance with the determined target temperature, and the opening degree of the air-mix door 10 corresponding to the heat load in the vehicle interior, the capacity of the evaporator 8, and the like. Then, various aspects of the air conditioner such as the air volume of the blower 7 are determined, and the automatic air conditioning control of the air conditioner 1 is performed. At this time, the conditioned air blowing mode is set to the heat mode with the highest heating efficiency.

Then, when the temperature in the passenger compartment rises and reaches a predetermined value,
In order to prevent the windshield from fogging, the air-conditioning air blowing mode is switched from the heat mode to the heat / diff mode. When the blowout mode is switched in this way, the opening degree of the air mix door 10 is reduced by the control of the microcomputer 32 described above, and the temperature of the conditioned air blown out from the defrost blowout port 12 and the heat blowout port 14 is reduced. Slightly lower. Specifically, as shown in FIG. 4, when the air-conditioning air blowing mode is switched from the heat mode to the heat / diff mode, the opening degree of the air mix door 10 set according to the outside air temperature is indicated by a solid line. To the state shown by the broken line. This suppresses an increase in the temperature around the head of the occupant, and does not cause discomfort. In addition, the blowing air volume is increased with this operation. Specifically, as shown in FIG. 5, the drive voltage of the blower 7 set according to the outside air temperature is increased from the state shown by the solid line to the state shown by the broken line in accordance with the switching of the blowing mode. Thereby, the above-mentioned operation, that is, the air mixing door
It is possible to compensate for the decrease in the heating capacity due to the decrease in the opening degree of the ten. In other words, the amount of air blown out is increased by an amount corresponding to the decrease in the temperature of the conditioned air.

When the auto switch 44 on the control panel 37 is not pressed, the blowing mode is manually set.

As described above, in the air conditioner 1 of the present embodiment, the opening degree of the air mix door 10 and the drive voltage of the blower 7 are adjusted according to the air-conditioning air blowing mode. It is possible to prevent an increase in the temperature around the section and prevent the passengers from feeling uncomfortable, and at this time, to obtain an optimal air-conditioning state without reducing the heating capacity.

In the present embodiment, the mode is switched from the heat mode to the heat / diff mode when the vehicle interior temperature reaches a predetermined value. However, when the difference between the vehicle interior temperature and the outside air temperature reaches a predetermined value, Alternatively, the switching may be performed when a predetermined time has elapsed after the start of the heating operation.

(Effects of the Invention) As described above, according to the present invention, the air-conditioning air blowing mode is changed from the heat mode to the heat / air mode during the heating operation with respect to the automotive air conditioner in which the air-conditioning air blowing mode can be automatically switched. When the mode is switched to the differential mode, the opening degree of the heating adjusting means is increased by a predetermined amount to reduce the amount of air introduced into the heating means, and the driving voltage of the blower is increased by a predetermined amount to increase the amount of air blown from each outlet. Therefore, the temperature of the conditioned air blown out from the defrost outlet is reduced, so that the occupant does not feel discomfort due to the feeling of head heat. It can compensate for the decrease in heating capacity due to the temperature drop,
The air conditioning performance can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 5 show an embodiment of the present invention, FIG. 2 is a diagram showing the overall configuration of an air conditioner, FIG. 3 is a flowchart showing air conditioning control by a microcomputer, and FIG. FIG. 5 is a characteristic diagram showing the relationship between the opening degree of the mix door and FIG. 5 is a characteristic diagram showing the relationship between the outside air temperature and the driving voltage of the blower. DESCRIPTION OF SYMBOLS 1 ... Air conditioner 1a ... Air passage 7 ... Blower (blowing means) 9 ... Heater core (heating means) 10 ... Air mix door (heating adjusting means) 12 ... Defrost outlet 14 ... Heat outlet 15… Cabin 50… Mode switching detection means 51… Control means

Claims (1)

(57) [Claims] 1. A vehicle in which air taken into an air passage by a blowing means is temperature-adjusted at least by a heating means and then blown into a vehicle interior from a plurality of air outlets having a heat outlet and a defrost outlet. In the air conditioner for use, heating adjustment means for adjusting the amount of air introduced into the heating means, mode switching detection means for detecting that the blowing mode of the conditioned air has been switched from the heat mode to the heat / diff mode, When the output of the switching detection means is received and the air-conditioning air blowing mode is switched from the heat mode to the heat / diff mode during the heating operation, the opening of the heating adjustment means is adjusted so that the amount of air introduced into the heating means is reduced. While changing only a fixed amount, the drive voltage of the blower is increased by a predetermined amount so that the amount of air blown from the heat outlet and the defrost outlet increases. Air conditioning apparatus for a vehicle, characterized in that a control unit that.