JPH0231910A - Automatic air conditioner for automobile - Google Patents

Abstract

PURPOSE:To blow out high temperature air or low temperature air in opposition to a car outside temperature initially at the time of air conditioning starting, by providing a control circuit having a cutting in sequence for an air conditioning starting time, apart from a control sequence at an air conditioning stable period. CONSTITUTION:An air conditioning starting time cutting in sequence provided at a controller selects air heating or air cooling in response to a car outside temperature at the time of starting, and lowers the maximum value of blowing out air temperature when the car outside temperature is high, and heightens it when the temperature is low, and regulates temperature regulating dampers D1-D3 in response to the room outside temperature. And a block BL is regulated so that the quantity of blowing out air many become more, as the absolute value of a difference between a car inside temperature and a set temperature becomes larger, and when a cooling water temperature is low at the time of heating, the quantity of foot blowing out air is made to become more by means of a damper D4, and when the temperature of an evaporator EVP is high at the time of cooling, the quantity of foot blowing out air is made to become zero, and the quantity of blowing out air is gradually regulated to the optimum side. Thus, a desired air conditioning wind can be blown out from the time of starting.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to an automatic air conditioner for automobiles. In particular, the present invention relates to an automatic air conditioner for automobiles with improved air conditioning characteristics during startup.

b. Conventional technology FIG. 1 is a conceptual diagram of an example of an automatic air conditioner for an automobile.

Select air intake ports INI and IN2 with the first damper Di, take in air with the blower old, and then open the evaporator EV.
Send air to the PO. When the evaporator is operating, air is cooled by the evaporator EVP. Second
．． Third damper 02. C3 is used to control the amount of air passing through the heater H, thereby controlling the temperature of the air. The fourth damper D4 is used to control the amount of air blown out from the blower outlet provided at the feet, and the fifth damper D5 is used to control the amount of air blown out from the ventilator outlet and the defroster outlet. VENT,
Control DBF. Each damper can be operated manually or with an actuator At, A2. A3. A4. A
5.

When the room temperature is lower than the set temperature, the air volume is increased using the air volume control means WC, and the air volume passing through the heater H is increased to raise the temperature of the blown air. When the room temperature is higher than the set temperature, the air volume control means WC is used to increase the air volume and reduce the air volume passing through the heater H to lower the temperature of the blown air.

C9 Problems to be Solved by the Invention As in the prior art, air conditioning based on the difference between the room temperature and the set temperature provides a comfortable environment during the air conditioning stable period. However, if the air conditioner is started when the outside temperature of the vehicle is very low or very high, the human body will feel extremely uncomfortable when the air that has passed through the air conditioner directly hits the human body.

An object of the present invention is to provide an automatic air conditioner for a motor vehicle as described in the preamble of claim 1, which solves the discomfort during startup.

d. Means for Solving the Problem The above problem is solved by an automatic air conditioner for an automobile, which is equipped with a control circuit having an interrupt sequence for starting the air conditioner, in addition to the control sequence during the stable period of the air conditioner, that is, claim 1. The problem was solved by the automatic air conditioning system for automobiles described in Section 1.

This interrupt sequence determines the maximum and minimum values of the blown air based on the temperature outside the vehicle, controls the temperature in the temperature range between the maximum and minimum values, and further determines the temperature at the footwell outlet based on the cooling water temperature or evaporator temperature. Determine the air volume ratio from

e. Effect: This interrupt sequence selects heating or cooling operation depending on the temperature outside the vehicle at the time of startup. When the temperature outside the vehicle is high, the maximum temperature of the air blown out is lowered, and as the temperature outside the vehicle decreases, the maximum temperature of the air blown out is lowered. When the temperature outside the car is low, the minimum value of the blown air temperature is raised, and as the temperature outside the car rises, the minimum value is lowered. The blower is set to 1 ion to increase the amount of air blown out as the absolute value of the temperature difference increases, and when the cooling water temperature is low during heating operation, the amount of air blown out from the outlet provided at the foot is increased. As the temperature of the cooling water rises, the outlet switching damper is adjusted to reduce the ratio of the amount of air blown out from the outlet provided at the foot, and when the temperature of the evaporator is high during cooling operation, the outlet The damper for switching the air outlet is adjusted so that the amount of air blown from the evaporator is set to zero, and air blowing starts when the temperature of the evaporator drops.

f. Embodiment FIG. 2 is a block diagram showing input and output signals of a control circuit C0NT including a stability control circuit and a starting control circuit of the automatic air conditioner for an automobile according to the present invention.

When starting the air conditioner, the starting signal 5TART is the control 8 circuit C0N.
The starting control circuit operates during that period, and after the period has elapsed, the stabilization control circuit operates.

The starting signal 5TART can be realized, for example, by using a voltage corresponding to the cooling water temperature, a voltage corresponding to the evaporator temperature, a capacitor discharge circuit and a comparator circuit operated by the terminal voltage of the capacitor, or by using a digital counting circuit. .

The control circuit C0NT receives an outside temperature signal So, which is a signal from a sensor that detects the outside temperature TO, and an inside temperature signal SI+, which is a signal from a sensor that detects the inside temperature T.
A water temperature signal Sea, which is a signal from a sensor that detects the temperature of the cooling water Tw, and a temperature T of the evaporator.

The evaporator temperature signal S! is the signal from the sensor that detects the evaporator temperature signal S! , a solar radiation signal Ss, which is a signal from a sensor that detects the solar radiation amount SQ, is sent. Further, a set temperature signal S0 corresponding to the set temperature Ts set by manual operation is also input to the control circuit C0NT.

This control circuit connects the second damper D2. of FIG. 1 to adjust the temperature of the air. The second damper D3 controls the third damper D3.
actuator ^2. A signal that controls the third actuator A3 and a signal that controls the fourth actuator A4 that controls the fourth damper 04 in FIG. 1 to adjust the ratio of the amount of air blown out to the feet and the amount of air. Air volume control means-C for controlling the blower BL in FIG. 1 to
and a compressor control signal COMP that operates the compressor when performing a cooling operation and stops the compressor when performing a heating operation.

FIG. 3 is a flowchart of the control sequence of the stability control circuit.

When the outside temperature TO of the vehicle is higher than a predetermined value (for example, 15° C.), the compressor is operated for cooling operation (COOLING). On the other hand, when the temperature is low, heating is activated (WARMING).
The compressor is not activated to allow the air conditioner to operate, and cooling and heating operations can also be selected manually.

The temperature inside the car is T+ during heating operation (MAR?1ING)
011) is lower than the set temperature Ts, the damper [12°D3 in FIG. 1 is controlled to increase the ratio of the amount of air heated by the heater H. When it is high (W2), the ratio of the amount of air heated by heater H is reduced. In any case (Wl, 42), when the difference DEF between the set temperature and the inside temperature is large, the air volume control means -〇 is used to adjust the air volume WQ.
Make it bigger.

During the cooling operation (GOORING), the temperature inside the car T1
is higher than the set temperature Ts (C1), the ratio of the amount of air heated by the heater H is reduced. When the temperature is low (C2), the ratio of the amount of heated air is increased. In either case (C1, C2), if the difference DEF between the set temperature and the inside temperature of the vehicle is large, the air volume control means -C is used to control the wind! -Increase the force Q.

Figure 4 shows the relationship between the set temperature Ts and the temperature T of the blown air.Curve (a) in Figure 4 shows the temperature of the air blown out from the foot outlet. # (b) shows the temperature of the air blown out from other outlets.

FIG. 5 shows an example of the relationship between the temperature difference DEF and the air volume WQ.

FIG. 6 is a flowchart of the control sequence of the starting control circuit.

When the outside temperature To of the vehicle is higher than a predetermined value (for example, 15° C.), the compressor is operated for cooling operation (COOLING). On the other hand, when the temperature is low, heating operation (WAR[NG)
Do not run the compressor to cause

The temperature control range is changed according to the vehicle outside temperature To.

That is, To('C) is To<0, 0<To<
10. 10<T.

< 20.20 < To < 30.30 < To
, the temperature control sequences A, B, C, D, respectively.
, branches to H.

In sequences A, B, C, D, and E, each
The second damper is controlled so that 00%, 70%, 50%, 30%, and 0% of the air passes through the heater H.

Figure 7 (A) shows the temperature of the blown air relative to the set temperature Ts in temperature control sequences A, B, C, D, and H.
In the graphs shown in (B), (C), (D), and (E), curve (a) is the temperature T of the air blown out from the foot outlet, and curve @) is the temperature of the air blown out from the other outlet. Indicates T.

Figure 7 (A) shows that when the outside temperature is extremely low, high temperature air will be blown out even if the set temperature is low.When the set temperature is set above 273 of the set temperature range, Follow it.

Figure 7 (B) shows that when the outside temperature is a little high, the temperature of the blown air decreases, and the set temperature is 1 of the set temperature range.
If it is set to /2 or higher, it will be followed.

FIG. 7(C) shows that when the outside temperature is moderate, an upper limit appears as the temperature of the blown air further decreases.
This is followed when the set temperature is set between 173 and 273 in the set temperature range.

FIG. 7(D) shows that when the outside temperature is high, the temperature of the blown air decreases, and this is true if the temperature is set to 1/2 or less of the set temperature range.

FIG. 7(E) shows that when the outside temperature is extremely high, the temperature of the blown air becomes extremely low. If the set temperature is set to 173 or less of the set temperature range, it will be followed.

The ratio of the amount of air blown from the foot outlet is controlled by the temperature Tw of the cooling water during heating operation (IIARMING), and by the evaporator temperature Tt during cooling operation (COOLING).

During heating operation, water temperature Tw ('C) is Tw < 30.3
0<Tw<50 When 50<Tw<65.65<Tw, branches to sequences F, G, H, and I, respectively. In sequence F, since the air temperature is low, both the foot outlet and the other outlets are closed. In sequence G, 100% of the air is blown out from the foot vents, in sequence H, 70% of the air is blown out from the feet, and 30% of the air is blown out from the other vents, and in sequence I, full-scale heating occurs and the air conditioning is turned off. Move on to the stable sequence.

During cooling operation, the evaporator temperature rt('c) is Tt
< 15.15 < z < 25.25 < Tt, branches to sequences J and L, respectively.

During the sequence, the air temperature is high, so both the foot outlet and the other outlets are closed. In sequence K, 30% of the air is blown out from the outlet at the feet, and 70% of the air is blown out from the other outlets, and in sequence J, full-scale cooling occurs and the sequence moves to the one when the air conditioning is stable.

The control of sequence F is as follows. 5th damper 0
4. Mouth 5, 4th. This can be done by controlling via the fifth actuators A4 and A5.

g. Effects of the invention i) When the air conditioner is started when the outside temperature of the vehicle is low, high temperature air can be blown out from the beginning.

ii) When the air conditioner is started when the temperature outside the vehicle is high, low temperature air can be blown out from the beginning.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of an example of an automatic air conditioner for an automobile, and Fig. 2 shows a human output signal of a control circuit C0NT including a control circuit for stability and a control circuit for starting of the automatic air conditioner for an automobile according to the present invention. 3 is a flowchart of the control sequence of the control circuit for stable conditions, FIG. 4 is a graph showing the relationship between set temperature Ts and blown air temperature T in stable conditions, and FIG. 5 is a graph showing the temperature difference in stable conditions. A graph showing an example of the relationship between DEF and air volume, Fig. 6 is a flowchart of the control sequence of the control circuit for starting, Fig. 7 (A), (B
), (C) ([1), (B) are graphs showing the relationship between the set temperature Ts and the temperature T of the blown air at the time of startup. A1-A5...Actuator, BL...Blower 1
, D1-D5...Damper, BVP...Evaporator DEF...Defroster outlet, FLOOR...Floor outlet, H...Heater, 1
81, 12... Air intake port, VENT... Ventilator outlet WC... Air volume control means, 5TART... Starting signal, So... Temperature signal outside the vehicle, Sl... Temperature signal inside the vehicle, S11. ... Cooling water temperature signal, S□ ... Evaporator temperature signal, Ss ... Solar radiation amount signal, S7. ...Set temperature signal, COMP...Compressor, C0NT...
・Control circuit, To...Temperature outside the vehicle, T...
・In-vehicle temperature, Ts...Set temperature, Tw...
・Cooling water temperature, Try... Evaporator temperature. Tototototo

Claims (1)

[Claims] A blower that takes in air and blows it into the device, an evaporator that cools the air sent from the blower, a heater that heats a part of the air cooled by the evaporator, and a device that is heated by the heater. A temperature control damper that adjusts the ratio of the amount of air to the amount of air that is not heated by the heater, a plurality of air outlets for blowing out air, at least one of which is provided at the feet, and An air outlet switching damper that adjusts the ratio of the amount of air blown out from the provided air outlets, an actuator that controls the temperature adjustment damper and the air outlet switching damper, respectively, and an interior temperature detection means that detects the interior temperature of the vehicle. , an inside temperature setting means for setting the inside temperature of the car, and when the temperature is stable, selecting whether to perform heating operation or cooling operation depending on the outside temperature of the car,
When the temperature inside the car is lower than the set temperature, the temperature of the blown air is increased according to the temperature difference, and when it is higher than the set temperature, the temperature control damper is adjusted so that the temperature of the blown air is lowered according to the temperature difference. However, in an automatic air conditioner for a car that is equipped with a stable control circuit that has a function to adjust the blower to increase the amount of air blown out as the absolute value of the difference between the inside temperature and the set temperature increases, when starting, There is a function that selects heating or cooling operation depending on the temperature, and when the temperature outside the vehicle is high, the maximum temperature of the blown air is lowered, and as the temperature outside the vehicle decreases, the maximum value is increased. A function that adjusts the temperature control damper so that the temperature of the blown air increases when the temperature is low, and lowers the temperature of the blown air as the outside temperature rises, and as the absolute value of the difference between the inside temperature and the set temperature increases. There is a function that adjusts the blower to increase the amount of air, and when the temperature of the cooling water is low during heating operation, the amount of air blown out from the outlet provided at the feet is increased, and the temperature of the cooling water is high. Accordingly, the damper for switching the air outlet is adjusted to reduce the ratio of the amount of air blown out from the air outlet provided at the feet, and when the evaporator temperature is high during cooling operation, the amount of air blown out from the air outlet is adjusted. 1. An automatic air conditioner for an automobile, comprising a starting control circuit having a function of adjusting a damper for switching an air outlet so that the temperature of the evaporator is set to zero and air is started when the temperature of the evaporator drops.