JPH0617085B2 - Air conditioner for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a vehicle air conditioner.

[Prior Art] Generally, a vehicle air conditioner is installed in a vehicle to provide comfortable conditioned air to the vehicle interior.

FIG. 3 shows a vehicle air conditioner according to the prior art.

In the figure, 1 is a ventilation duct, and the ventilation duct 1 has an air intake portion 2 at an upstream end and an air blowing portion 3 at a downstream end, and the air blowing portion 3 communicates with a vehicle interior. The air intake section 2
Is composed of an inside air intake 2A and an outside air intake 2B,
One is selectively opened fully by the inside / outside air switching door 2C, or both are opened at a predetermined ratio. In addition, the air outlet 3 includes a defrost outlet 3A and a face outlet 3
B, a mode switching door 3 composed of a foot outlet 3C
It is opened by D and 3E.

On the upstream side of the ventilation duct 1, a blower fan 4 having a variable blown amount is installed. The blower fan 4 takes in air from the air intake portion 2 into the ventilation duct 1,
After ventilating the inside, the air is blown out from the air blowing section 3 into the vehicle interior.

Here, the mode of blowing out from the face outlet 3B is called a vent mode, the mode of blowing out from the defrost outlet 3A is called a defrost mode, and the foot outlet 3 is called.
The mode blown out from C is called heat mode. Switching between these modes is called mode control.

Moreover, 5 shows a refrigerating cycle. The refrigeration cycle 5
It is composed of an evaporator 6, a condenser 7, a compressor 8 installed in the ventilation duct 1, the evaporator 6, the condenser 7, a refrigerant circulating in the compressor 8 and the like. The refrigeration cycle 5 cools the ventilation in the ventilation duct 1.

A heater core 9 is installed on the downstream side of the evaporator 6. By the heater core 9, the ventilation duct 1
Ventilation inside is warmed.

Further, the air mix door 1 is provided on the upstream side of the heater core 9.
0 is provided. The air mix door 10 is driven by an air mix door drive means 10A. The air mix door 10 is adapted to rotate upward and downward in the figure, and depending on the stop position of the air mix door 10,
The amount of ventilation that touches the heater core 9 changes.

Therefore, the temperature of ventilation is determined by the stop position of the air mix door 10.

Reference numeral 11 denotes an inside air temperature sensor that measures the vehicle interior temperature Tr in the vehicle interior, 12 an outside air temperature sensor that measures the outside air temperature Ta, and 13 an insolation sensor that measures the insolation amount Ts. 1
Reference numeral 4 represents a temperature measuring device. The temperature measuring device 14 has a temperature to be measured as a temperature inside the vehicle, that is, a desired set temperature T.
You can enter D.

Reference numeral 15 indicates a control means. The control means 15 includes a calculation section 16
And a control unit 17. The calculation unit 16 is adapted to obtain a total signal T represented by the following equation (1) based on the vehicle interior temperature Tr, the outside air temperature Ta, the solar radiation amount Ts, and the set temperature TD.

T = aTr + bTa + cTs + dT _E −eTD + A (1) (where a, b, c, d, e, A are constants, T _E is the temperature on the downstream side of the evaporator), and the control unit 17 controls the total signal T Based on the above, the blower control means 18 for controlling the blower 4, the door control means 19 for controlling the inside / outside air switching door 2C, the air mix door control means 20 for controlling the air mix door 10, the compressor control means 22 for controlling the compressor 8, etc. It consists of In addition, the mode control means 21 uses the following formula (2)
The mode switching door 3 based on the mode switching signal T _F
It controls the opening and closing of D and 3E.

T _F = T _E + Nθ + B (2) (θ is the angle of the air mix door, B is a constant) Air-conditioning control executed based on the comprehensive signal T and the mode switching signal T _F is called automatic control.

By the way, Japanese Utility Model Publication No. 50-20460 has been proposed as one relating to the mode control at the time of starting the heating. The heating activation refers to the air conditioning control from when the engine is started to when the automatic control is reached. Thus, the device according to the proposal is in the defrost mode while the engine water temperature rises to a predetermined temperature, and then is automatically controlled. However, in the case of such a device, when the engine water temperature is low, the blowout temperature is also low, but in such a device,
In this case, since the defrost mode is set, the feeling of cold wind is not given to the feet, and the effect of clearing the cloud of the window glass is also achieved.

Also, as for the mode control, there is disclosed in Japanese Patent Laid-Open No. 59-59
No. -20719 has been proposed. The device according to the proposal is to set the (defrost / heater) mode until the engine water temperature reaches a predetermined temperature, and then switch to automatic control.

In the case of such a device, only a part of the blown air is at the foot outlet 3
Since the air is blown out from C, air is blown out from both the defrost outlet 3A and the foot outlet 3C although the feeling of cold air at the feet is small, so that the room temperature rises quickly.

[Problems to be Solved by the Invention] However, the prior art has the following problems.

That is, in the case of the conventional technology, as described above, the defrost mode or the defrost / heater mode is maintained until the water temperature reaches the predetermined temperature, and the heater mode is set when the predetermined temperature is reached. The blowing temperature at the time of mode switching is set to a relatively high temperature so that the occupant does not feel cold air.

Therefore, when the defrost mode is set until the water temperature reaches a predetermined temperature, immediately before switching to the heater mode, high temperature blown air blows out from the defrost outlet to the occupant's head, which is uncomfortable.

When the defrost / heater mode is set until the water temperature reaches the predetermined temperature, the cold air hits the feet at the beginning of the start and is uncomfortable, and the air volume from the defrost outlet is smaller than in the defrost mode only. Even though it was easy to get cloudy, there was a drawback that the ability to clear the window glass was reduced.

Therefore, the present invention has been made in view of the above circumstances, and its purpose is suitable for feeling of cold head heat at the time of heating start,
Another object of the present invention is to provide a vehicle air conditioner capable of preventing fogging of windows at the beginning of heating.

[Means for Solving Problems] In the vehicle air conditioner according to the present invention, when the engine water temperature is equal to or lower than a predetermined temperature, the amount of air blown is low, and when the temperature is equal to or lower than the predetermined temperature, room temperature rises or In a vehicle air conditioner that performs heating control by controlling a blower control voltage that is compared with the air flow rate so as to increase the air flow rate based on a timer, the blower control voltage is smaller than a first set value, and the engine When the water temperature is lower than the predetermined temperature, only the defrost outlet for preventing fog is opened, and the blower control voltage has the first set value and the second set value larger than the first set value. When the engine water temperature is higher than the predetermined temperature, the defrost outlet and the foot outlet that warms the foot at the start are simultaneously opened, and the blower control voltage is higher than the second set value. When it is large, a mode setting means for opening only the foot outlet is provided, and the mode is switched based on the air flow rate and the engine water temperature.

[Operation] When the engine water temperature is lower than a predetermined temperature, the blower control voltage is the first
When the value is less than or equal to the set value of, the mode setting unit blows the conditioned air from the defrost outlet. Further, the conditioned air is blown out from both the defrost outlet and the foot outlet until the engine water temperature becomes equal to or higher than a predetermined temperature and the blower control voltage reaches the second set value. In addition, the blower control voltage is the second
After reaching the set value of, the conditioned air is blown out from the foot outlet.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 4.

In the configuration diagram of FIG. 1, reference numeral 31 denotes a determination means for determining whether or not the blower is under heating start control. This heating start control is proportional to the air flow rate so that the air flow rate is low when the engine water temperature is lower than a predetermined temperature, and when the engine water temperature is higher than the predetermined temperature, the air temperature is raised or the air flow rate is increased based on a timer. It controls the blower control voltage. That is, as the control contents, there are two controls, that is, a control for increasing the blower control voltage according to the rise in the room temperature and a control for increasing the blower control voltage according to the passage of time by the timer, and the respective blower control voltages are large. It is a method of controlling by one. Since the air flow rate and the blower control voltage are in a proportional relationship, the rise control of the voltage results in a proportional change in the air flow rate. It should be noted that the room temperature rises not only at startup but also when the setting of room temperature is raised, for example, but the heating startup control is performed only at the first time when the engine is started. Since the control is started from the state in which the outside air temperature is low, the degree of temperature rise is also large, which is different from other normal controls.

A blower control voltage 32 is a blower control voltage for controlling the blow rate of the blower 4 (this is proportional to the blow rate).
Is a predetermined voltage (for example, 6 V) or more, that is, a detection means for detecting whether or not the startup air flow is a predetermined amount or more.

Reference numeral 33 denotes a switch determination unit that determines whether the blower switch is on or off. The blower switch is a switch provided on the operation panel of the driver's seat for selectively operating whether the blower is operated (ON) or stopped (OFF).

Reference numeral 34 indicates a mode setting means. The mode setting means 34
Controls the operation of the mode switching doors 3D and 3E based on the engine water temperature and the amount of air blown by the blower 4.

Next, the operation will be described with reference to FIGS. Note that FIG. 2 is a flow chart, and FIG. 4 is a diagram showing the relationship between the engine water temperature and the air flow rate and each mode.

First, in step S ₁ of FIG. 2, it is determined whether automatic control or manual control is performed, and if it is automatic control, step S ₂
Do the following.

In step S ₂ , the mode switching signal T _F has the predetermined value a.
When the above, executes Step _{S 3.} This step S
₃ , when the mode switching signal T _F is less than or equal to the predetermined value b, in step S ₄ , the bi-level mode is set,
When the value is equal to or larger than the predetermined value b, the vent mode is set in step S ₅ .

On the other hand, in step _{S 2,} the mode switching signal _{T F}
When is less than a predetermined value a, in step S _6, the determination means 31, the blower 4 determines whether or not the heating start, as a result, when the heating start control is completed, in step S ₇ Set to heater mode.

Further, in step S _6, not in the heating startup control of the blower is complete, if in the control performs step S _8. In step S _8, when the detection means 32 blower voltage is equal to or greater than a predetermined value beta (second set value), i.e., air blowing amount is detected that is equal to or higher than the predetermined value, step S _{In 7} , the heater mode is set.

Further, the blower voltage in the step S ₈ is in the case of less than the predetermined value β executes step S _9. Step S ₉
When the water temperature switch is ON, that is, when the engine water temperature is still lower than the predetermined temperature α, the mode setting means 34 sets the defrost mode in step S ₁₀ .

Further, in step S _9, the water temperature switch is turned off, i.e., when the engine coolant temperature is equal to or higher than the predetermined temperature α executes step S _11. In step S _11, a determination blower switch case (operation panel switch determination unit 33 detects the on the blower switch is on or off, but it is not a previous state particularly limited, when on blower rotation (In the state), the mode setting means 34 sets the (defrost / heater) mode in step S ₁₂ .

On the other hand, when the blower switch is off in step S ₁₁ (the blower switch on the operation panel is off and the blower is in the stopped state), the mode setting means 34 causes the heater to be set in step S ₇ . Set to mode. Here, when the blower switch is off in step S _11, to the heater mode in step S ₇ for the following reason. That is, if the blower switch is turned off, not performed starting air volume calculation, as a result, not performed the determination in step S _8, Therefore, even when necessary, be due to not a heater mode in step S ₇ .

Thus, in the present invention, after the engine is started as shown in FIG. 4, when the engine water temperature is equal to or lower than the predetermined temperature α in step S ₉ , the defrost mode is set in step S _{10 to set} a low amount of cold air. By guiding the to the window side, it is possible to prevent the windshield from fogging while preventing the passengers from feeling the cold wind at their feet.

If the engine water temperature reaches the predetermined temperature α in step S ₉ and the air flow rate is less than or equal to the predetermined amount (blower control voltage β) in step S ₈ , that is, if the temperature of the blown air is not so high, step S ₁₂ In (defrost / heater) mode. In this case, the temperature of the blown air is higher than that in the previous case, but only part of the blown air is guided to the window side, and part of the blown air is guided to the feet, so the head is excessive. The feeling of heat is not felt, and there is no feeling of excessive cold wind at the feet, which gives a suitable feeling. At this time, as shown in FIG. 4, the blower control voltage, that is, the amount of blown air also increases, so that it is possible to effectively perform the foot heating while clearing the cloudy weather.

Further, a predetermined amount of air volume in step S ₈ the temperature of the outlet air in the case of (blower control voltage beta) or less is hot, hot air to the foot side by a heater mode in step S ₇ Lead. This produces a cold head heat.

By the way, in JP-A-60-29319, when the engine water temperature is below a predetermined temperature, the defrost mode is set to a low air flow rate, and when the engine water temperature or the floor outlet temperature is above a predetermined temperature, the air flow rate is kept low and the heater mode is set. It is shown that the mode is switched to. In this case, compared with the above-mentioned present invention, since the air flow rate is constant at a low air flow rate in the defrost mode → heater mode, it is not possible to effectively perform foot heating while clearing cloudy weather as in the present invention. . In other words, the clouding effect and the heating effect are greatly influenced by the air volume, so that the effect is small if the air volume remains low.

Further, in the technique of the present application in which the amount of air blown is increased by the room temperature or the timer, the rising state of the amount of air blow changes variously depending on the heating start condition. Therefore, in order to always perform the mode switching under the same condition, it is difficult to set a predetermined temperature and a predetermined elapsed time in advance, which is difficult.
However, according to the present application, since the mode switching is performed based on the air flow rate, the mode switching can always be performed under the same condition.

[Effects of the Invention] As described above, according to the present invention, when the engine water temperature is equal to or lower than the predetermined temperature and the blower control voltage is equal to or lower than the first set value, the defrost mode is set when the engine water temperature is equal to or lower than the predetermined temperature. Above, and the blower control voltage is the second
Since it is set to the (defrost / heater) mode until the set value of is reached, and is set to the heater mode after the blower control voltage reaches the second set value, compared with the prior art, A fine mode switching can be executed as the temperature of the blown air rises. In other words, in the case of the dual use mode such as the defrost / heater mode, it is not possible to effectively heat the feet while clearing the window glass without a predetermined amount of air blow, but according to the present application, the clearing effect is obtained. The defrost / heater mode state is maintained up to a certain area to sufficiently warm the window glass to clear the cloudiness, and then the heater mode is set to heat the feet so that the effect of cold head and foot heat can be obtained.
Further, since the mode switching is performed based on the air flow rate, it is possible to always switch the mode under the same condition.

[Brief description of drawings]

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a block diagram, FIG. 2 is a flow chart, FIG. 3 is a block diagram showing a conventional technique, and FIG. 4 is an engine water temperature in the present invention. It is a figure which shows the relationship between air flow rate and each mode. 3 ... Air outlet, 3A ... Defrost outlet, 3B ...
… Face outlet, 3C… Foot outlet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Nagayama 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Katsumi Iida 39, Toyo, Chiyo-ji, Konan-cho, Osato-gun, Saitama Diesel Equipment Co., Ltd., Gangnam Plant (72) Inventor Yoshihiko Sakurai, 39, Toyo-ji, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture Diesel Equipment Co., Ltd., Konan Plant (56) References JP 60-29319 (JP, A) Actual Open 56-63617 (JP, U) Actual Open 59-62009 (JP, U) Actual Open 58-9773 (JP, Y1)

Claims (1)

[Claims] 1. A blower control proportional to the blown air amount so that when the engine water temperature is below a predetermined temperature, the blown air amount is reduced, and when it exceeds a predetermined temperature, the blown air amount is increased based on a rise in room temperature or a timer. In a vehicle air conditioner that controls voltage to perform heating activation control, when the blower control voltage is lower than a first set value and the engine water temperature is lower than the predetermined temperature, a defrost outlet for preventing fog. Open only, the blower control voltage is a value between the first set value and a second set value larger than the first set value, and the engine water temperature is higher than the predetermined temperature. At this time, the defrost outlet and the foot outlet for warming the foot at the time of starting are simultaneously opened, and when the blower control voltage is higher than the second set value,
An air conditioner for a vehicle, characterized in that a mode setting means for opening only the foot outlet is provided, and mode switching is performed based on an air flow rate and an engine water temperature.