JPS5919849B2 - Automatic air conditioning system for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for conditioning the interior of a vehicle such as an automobile, and more particularly to an automatic air conditioner that is automatically controlled according to the environment of the vehicle.

2. Description of the Related Art A so-called automatic air conditioner that automatically adjusts and maintains the temperature inside a vehicle at a temperature determined by the will of a passenger such as a driver is conventionally known.

The present invention also provides an automatic air conditioner that automatically adjusts and maintains the temperature inside a vehicle at a temperature determined by the will of the occupant, and which not only controls the temperature of the blown air according to the target temperature inside the vehicle. It automatically switches between inside and outside air, controls the speed of the blower fan, and switches the air outlet to provide more comfortable air conditioning, and also controls the operation of the cooling heat exchanger according to the target cabin temperature. The purpose is to provide an automatic air conditioning system for vehicles that saves power.

According to the present invention, the present invention provides a ventilation duct having an inside air intake and an outside air intake at one end and a heater outlet and a vent outlet at the other end; an inside/outside air switching damper that selectively opens and closes the outside air intake;
an inside/outside air switching actuator that switches and drives the inside/outside air switching damper; a blower fan that blows air through the ventilation duct; a blower fan speed control actuator that controls the speed of the blower fan; a compressor; a condenser; a cooling evaporator provided in the middle of the ventilation duct and operated by refrigerant sent from the compressor; a compressor on/off actuator for turning on and off the compressor; and a heating heater element provided in the middle of the ventilation duct and operated by engine cooling water. , an air mix damper that controls the flow rate of air passing through the heating heater element, an air mix damper actuator that drives the air mix damper, and an air that selectively opens and closes the heater outlet and the vent outlet. An air outlet switching damper, an air outlet switching actuator that drives the air outlet switching damper, a temperature setting device that is set to a desired temperature by an occupant, and a temperature setting device that detects outside air temperature and generates a signal in accordance with the temperature. an outside air temperature sensor, an inside air temperature sensor that detects the vehicle interior temperature and generates a signal in accordance with the temperature, and an evaporator outlet temperature sensor that detects the air temperature at the outlet of the cooling evaporator and generates a signal in accordance with the air temperature. a water temperature sensor that detects the engine coolant temperature applied to the heater element and generates a signal in accordance with the temperature; a damper opening sensor that detects the opening of the air mix damper and generates a signal in accordance therewith; and the temperature setting. The device includes a target outlet air temperature calculation circuit that calculates a target outlet air temperature by correcting a set temperature signal using signals generated by the outside temperature sensor and the inside temperature sensor, and the target outlet air temperature calculation circuit. a drive circuit that drives the inside/outside air switching actuator so as to take in inside air when the target blown air temperature is below a predetermined value and to take in outside air when the target blown air temperature is equal to or higher than the predetermined value; When the blowing air temperature is in a predetermined intermediate temperature range, the blower fan is operated at a low rotational speed, and when the target air blowing air temperature is in a temperature range lower than the intermediate temperature range or in a temperature range higher than the intermediate temperature range, a drive circuit that drives the blower fan speed control actuator to drive the blower fan at a high rotational speed; a drive circuit that drives the air outlet switching actuator according to the target blowout air temperature; and a drive circuit that drives the air outlet switching actuator in accordance with the target blowout air temperature. a comparison circuit that compares the output signal of the evaporator outlet temperature sensor and sends a control signal to the combustor-on-off-actuator; and a target damper opening calculation circuit that calculates a target damper opening from the target damper opening calculation circuit, and compares the target damper opening calculated by the target damper opening calculation circuit with the output signal of the damper opening sensor to control the air mix damper actuator. This is achieved by an automatic vehicle air conditioner characterized in that it has a comparison circuit that sends a control signal to the vehicle.

In the vehicle automatic air conditioner of the present invention having the above configuration, when a desired temperature is set by the occupant using the temperature setting device, at least the outside air temperature detected by the outside air temperature sensor is adjusted based on this set temperature. The target outlet air temperature is calculated by the target outlet air temperature calculation circuit, taking into account the temperature inside the vehicle and the temperature detected by the interior temperature sensor, and the target outlet air temperature is calculated by correcting the temperature set by the passenger based on the outside air temperature and the inside air temperature. Temperature is used as a target value for temperature control.

Even when a passenger sets the desired temperature, this is done by taking into account the general sensory error in how hot or cold a human feels, depending on the conditions of outside and inside air temperatures. It automatically corrects based on sensory errors.

After calculating the target blowing air temperature, it is determined based on this whether the target blowing air temperature is above or below a predetermined value, and if it is below the predetermined value, the inside/outside air switching device is When the target blowing air temperature is equal to or higher than a predetermined value, an operation is performed to switch the inside/outside air switching device to the outside air side.

This is to deal with the problem that when the target outlet air temperature is lower than a certain value, that is, when strong cooling is desired, when outside air is taken in, air that is hotter than the outside enters and it is difficult to effectively cool the inside of the vehicle. .

Furthermore, in the vehicle automatic air conditioner having the above configuration, when the target outlet air temperature is in a predetermined intermediate temperature range, the blower fan is operated at low rotation speed, and the target outlet air temperature is in the intermediate temperature range. The speed of the blower fan is controlled to increase the rotational speed of the blower fan even when the rotation speed is lower than this or even when the speed is higher than this.

This means that being in the intermediate temperature range where the target outlet air temperature is, means that the temperature at that time is neither low nor high, and generally indicates a state where neither cooling nor heating is required. The blower fan is operated at a low rotation speed to save energy for driving the fan, and when the target blowing temperature is lower than this, that is, fairly strong cooling is required, or when the target blowing temperature is higher than this, that is, considerably strong heating. When this is required, the rotational speed of the fan is increased to achieve effective cooling or heating.

In addition, in the automatic air conditioner for vehicles having the above configuration, the cooling heat exchanger is controlled by an evaporator outlet temperature sensor that detects the air temperature at the outlet of the cooling heat exchanger and generates a corresponding signal. The temperature at the outlet is constantly monitored, and the on/off of the compressor that operates the evaporator is controlled depending on whether the temperature at the evaporator outlet is lower or higher than the target blowing temperature.

Furthermore, in the vehicle automatic air conditioner having the above configuration, the opening state of the air outlet is switched depending on the target blowout air temperature.

This has the effect of switching the air outlet between a vent outlet, a pie level outlet, and a heater outlet during cooling or heating, thereby making the cooling or heating effect more comfortable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of an automatic air conditioner for a vehicle according to the present invention.

In FIG. 1, 1 indicates a ventilation duct.

The ventilation duct 1 has an inside air intake 2 and an outside air intake 3 at one end, and the inside air intake 2 and the outside air intake 3 are selectively connected to each other by an inside/outside air switching damper 4. One side is open and the other is closed.

The internal/external air switching damper 4 is driven by an appropriate internal/external air switching actuator 5 such as a negative pressure operated diaphragm device.

Further, the ventilation duct 1 has a heater outlet 6 and a vent outlet T at the other end, and the heater outlet 6 and the vent outlet lower are selectively opened and closed by respective dampers 8 and 9. It has become.

The damper 8 is connected to the air outlet switching actuator 10, and the damper 9 is connected to the air outlet switching actuator 1.
1, respectively.

A blower fan 13 that is rotationally driven by an electric motor 12 is provided near the one end of the ventilation duct 1 .

The blowing fan 13 is configured to blow air taken in from the inside air intake 2 or the outside air intake 3 toward the heater outlet 6 and the vent outlet lower.

The rotation speed of the electric motor 12 is controlled by a blower fan speed control actuator 14 .

In the ventilation duct 1 on the downstream side of the ventilation fan 13 in terms of air flow, there is a fan in order to completely cross the airflow flowing through the ventilation duct, that is, to cross all of one cross section of the ventilation duct 1. Evaporator 15 which is a heat exchanger for cooling
is provided.

Evaporator 15 includes compressor 16 and condenser 1
Together with 7 and others, it constitutes a refrigeration cycle and is supplied with refrigerant.

The cooler compressor 16 is selectively operated by a compressor on/off actuator 18.

Further, an air mix type temperature adjustment section 19 is provided in the ventilation duct 1 downstream from the location where the evaporator 15 is disposed.

The temperature adjustment unit 19 includes a heater element 20, which is a heating heat exchanger, provided in one cross section of the ventilation duct 1 in a part of the cross section, and an air flow flowing through the ventilation duct 1 provided in the cross section. an air mix damper 21 that separates a first airflow flowing through the heater element 20 and a second airflow flowing bypassing the heater element 20;
The temperature of the blown air is adjusted by adjusting the opening degree of the damper and adjusting the distribution ratio of the first and second air flows.

The heater element 20 is supplied with engine cooling water (not shown) in a circulating manner through a conduit 22.

In this case, when the damper is located at the position shown by the solid line in the figure, the airflow flowing through the ventilation duct 1 passes through the heater element 20, thereby increasing the temperature of the blown air. When 21 is in the position shown by the phantom line in the figure, all of the air flowing through the ventilation duct 1 bypasses the heater element 20, so that the temperature of the blown air is low.

The air mix damper 21 is driven by an air mix damper actuator 23.

The inside/outside air switching actuator 5, the air outlet switching actuators 10, 11, the blower fan speed control actuator 14, the compressor on/off actuator 18, and the air mix damper actuator 23 are individually controlled based on operation commands generated by a microcomputer 24. It has become so.

The microcomputer 24 receives a set temperature signal from a temperature setting device 25 operated by a passenger such as a driver, an outside temperature signal from an outside temperature sensor 26, an inside temperature signal from an inside temperature sensor 27, and a solar radiation temperature from a solar radiation sensor 2B. It receives an evaporator outlet temperature signal from the evaporator outlet temperature sensor 29, a water temperature signal from the water temperature sensor 30, and a damper opening signal from the damper opening sensor 31, and outputs an operation command to each of the actuators based on these signals. It looks like this.

The outside air temperature sensor 26 is configured to detect the outside air temperature To and generate a temperature signal corresponding to the outside air temperature To.

The interior temperature sensor 27 detects the vehicle interior temperature Ti and generates a temperature signal corresponding to the temperature Ti.

The solar radiation sensor 28 detects the solar radiation temperature Ts in the vehicle interior and generates a temperature signal corresponding to the solar radiation temperature Ts.

The evaporator outlet temperature sensor 29 is connected to the evaporator 15
It is provided further downstream, detects the temperature Te of the air that has passed through the evaporator 15, and generates a temperature signal corresponding to the temperature Te.

The water temperature sensor 30 detects the engine coolant temperature Tw applied to the heater element 20 and generates a temperature signal corresponding to the temperature Tw.

The damper opening sensor 31 detects the opening θr of the air mix damper 21 and generates an opening signal corresponding thereto.

FIG. 2 is a block diagram showing one embodiment of the microcomputer 24. As shown in FIG.

The microcomputer 24 includes a feeling correction setting value calculation circuit 32.

This feeling correction set value calculation circuit 32 receives a set temperature signal from the temperature setting device 25, an outside temperature signal from the outside temperature sensor 26, and a solar radiation temperature signal from the solar radiation sensor 28, and sets the feeling correction according to the following formula. Value Tse
t' is calculated.

Tset'=Tset-α(To-β)-γ・TS
(1) Tset is the set temperature set by the temperature setting device 25, and α, β, and γ are each constant.The feeling correction set value signal generated by the feeling correction set value calculation circuit 32 is sent to the target outlet air temperature calculation circuit 33. is input.

The target outlet air temperature calculation circuit 33 receives the feeling correction setting value signal and the outside temperature signal generated by the outside temperature sensor 26,
Given the inside temperature signal generated by the inside temperature sensor 27 and the solar radiation temperature signal generated by the solar radiation sensor 28, the target blowing air temperature Tt is calculated according to the following formula.

Tt=to 1 ・Tset -to 24o-to 3-'ri
- to 4' Ts- to 5 (2) K1- to 5 are constants.The target outlet air temperature signal generated by the target outlet air temperature calculation circuit 33 is connected to the drive circuit 34 for the inside/outside air switching actuator 5 and Drive circuit 35 for outlet switching actuator 10.11 and drive for blower fan speed control actuator 14.

The signals are respectively input to a dynamic circuit 36.

As shown in FIG. 3, the drive circuit 34 is configured to introduce inside air when the target blown air temperature Tt is lower than a predetermined temperature T2, and to introduce outside air when the target blown air temperature Tt is higher than the predetermined temperature T2. An operation command signal is output to the inside/outside air switching actuator 5 so that the operation is performed.

If the target blowing air temperature Tt is low, the cooling heat load on the vehicle is high, and the inside of the vehicle requires low-temperature blowing air.

During cooling, cooler air can be ensured when inside air is introduced than when outside air is introduced.

Therefore, in this embodiment, inside air is introduced when the target blowout air temperature is low.

As shown in FIG. 3, the drive circuit 35 sets the target blowout air temperature Tt so that when the target blowout air temperature Tt is lower than the predetermined temperature T3, air is blown out from the vent blowout lower.
The target blowout air temperature Tt is set to a predetermined temperature so that when the temperature is higher than the predetermined temperature T3 and lower than the predetermined temperature T4, air is blown out from both the heater outlet 6 and the vent blowout lower, that is, the pie level mode is achieved. When the temperature is higher than T4, an operation command signal is output to the air outlet switching actuators 10 and 11 so that air is blown out from the heater outlet 6.

By switching the air outlet in accordance with the target blowout air temperature, comfortable heating and cooling can be performed, such as when the head is cold or the feet are warm.

The drive circuit 36 also receives the water temperature signal generated by the water temperature sensor 30, and as shown in FIG. 4, the blower fan 13 is configured to stop rotating when the engine cooling water temperature Tw is, for example, 30° C. or lower. A signal is output to the speed control actuator 14, and the engine cooling water temperature Tw is set to 3.
When the temperature is between 0 and 50°C, an operation command signal is output to the blower fan speed control actuator 14 so that the blower fan 13 rotates at a low speed regardless of the target blowing air temperature Tt at that time, and the engine cooling water temperature Tw is 50°C. When the temperature is above, an operation command signal is output to the blower fan speed control actuator 14 so that the blower fan 13 is driven at a rotational speed corresponding to the target blowing air temperature Tt.

child. In this case, as shown in FIG. 3, the blower fan 13 is rotated at a low speed when the target outlet air temperature Tt is between the predetermined temperatures T1 and T5, and when the target outlet air temperature Tt is lower than T1, or When it is higher than T5, the rotation speed increases in stages.

From the viewpoint of noise reduction, it is desirable that the rotational speed of the blower fan be as low as possible while ensuring the amount of air necessary for air conditioning.

Therefore, in this embodiment, the rotation speed of the blower fan is controlled according to the target blowing air temperature.

The target outlet air temperature signal generated by the target outlet air temperature calculation circuit 33 is also input to the comparison circuit 31.

The comparison circuit 37 compares the target blowout air temperature signal with the evaporator outlet temperature signal generated by the evaporator outlet temperature sensor 29, and when the target blowout air temperature signal is larger than the evaporator output temperature signal, it outputs an off signal, and outputs an off signal. When the signal is smaller than the evaporator outlet temperature signal, an on signal is output to the compressor on/off actuator 18.

This causes the compressor 16 to maintain the evaporator outlet temperature T
e is larger than the target blowing air temperature Tt, and the evaporator 1
It operates only when it is necessary to operate 5.

This saves power and reduces horsepower loss due to engine compressor drive.

Further, the target outlet air temperature signal generated by the target outlet air temperature calculation circuit 33 is also input to the damper opening degree calculation circuit 38.

The damper opening calculation circuit 38 is given the target blowout air temperature signal, the evaporator outlet temperature signal generated by the evaporator outlet temperature sensor 29, and the water temperature signal generated by the water temperature sensor 30, and calculates the damper opening θt according to the following formula. It is designed to calculate.

The engine cooling water temperature Tw is a predetermined value (the temperature at which the water valve in the engine cooling system opens, e.g. 70°C)
degree) or less, θt-((T t - Te )/Tw-B-Te month
100 (3) When the engine cooling water temperature Tw is above a predetermined value, θt-((Tt-Te)/A-Te))X100
(4) A and B are constants. When the engine coolant temperature Tw is above a predetermined value, the constant A is used instead of the actual engine coolant temperature in calculating the damper opening. changes periodically due to the opening and closing of the water valve, and if this fluctuating engine cooling water temperature is used, the damper opening degree θt will frequently fluctuate as the engine cooling water temperature fluctuates, and the air mix damper will change accordingly. 23 opening changes frequently,
This is because it becomes impossible to obtain air at a stable temperature.

The constant A may be a value corresponding to the average engine coolant temperature under normal conditions when the water valve is open.

A damper opening signal generated by the damper opening calculation circuit 38 is input to a comparison circuit 39 .

The comparison circuit 39 compares the damper opening signal and the damper opening sensor 31.
The target damper opening signal is compared with the generated damper opening signal, and when the target damper opening signal is larger than the damper opening signal, the air mix damper 21 is moved in the closing direction (the direction in which the first air flow increases). , and when the target damper opening signal is smaller than the damper opening signal, an operation command signal is sent to the air mix damper actuator 23 so that the air mix damper 21 is moved in the opening direction (the direction in which the second air flow increases). It is designed to output .

As a result, the air mix damper 21 is set to an opening degree corresponding to the target outlet air temperature Tt, and the temperature of the outlet air is blown out to a temperature corresponding to the set temperature Tset set by the temperature setting device 25 regardless of the operation of the compressor 16. Adjust the air temperature.

In the above-mentioned embodiment, as clearly shown in FIG. 3, the speed of the blowing fan is changed in steps at predetermined temperature intervals when the target outlet air temperature is below the predetermined temperature T1 and above the predetermined temperature T5. However, the present invention is not limited to this, and as shown in FIG. It may be controlled to do so.

In addition, the speed control of the blower fan is performed when the engine cooling water temperature is 30°C.
When the temperature is between 50° C. and 50° C., the rotation speed may be changed continuously from low speed to medium speed as the temperature rises during that time.

Although the present invention has been described in detail with respect to specific embodiments above, it will be appreciated by those skilled in the art that the present invention is not limited to these embodiments and that various embodiments can be made within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of an automatic air conditioner for a vehicle according to the present invention, FIG. 2 is a block diagram of a control system for an automatic air conditioner for a vehicle according to the present invention, and FIGS. 3 and 5 are graphs showing the operating modes of the blower fan, internal/external air switching, and air outlet switching with respect to the target outlet air temperature, and FIGS. 4 and 6 are graphs showing the relationship between engine cooling water temperature and fan speed control, respectively. 1... Ventilation duct, 2... Vehicle interior air intake, 3... Vehicle exterior air intake, 4... Interior/external air switching damper, 5... ...Inside/outside air switching actuator, 6...Heater outlet, 7...Vent outlet, 8, 9...Damper, 10.11...
...Air outlet switching actuator, 12...
...Electric motor, 13...Blower fan, 14...
...Blower fan speed control actuator, 15...
... Evaporator, 16... Compressor,
17... Capacitor, 18... Compressor on/off actuator, 19... Temperature adjustment section, 20... Heater element, 21...
... Air mix damper, 22 ... Conduit, 23
...Air mix damper actuator, 24
・・・・・・Microcomputer, 25・・・・・・
Temperature setting device, 26...Outside temperature sensor, 27.
...Interior temperature sensor, 28... Solar radiation sensor, 29... Evaporator outlet temperature sensor, 30.
... Water temperature sensor, 31 ... Damper opening sensor, 32 ... Feeling correction set value calculation circuit, 33 ... Target outlet air temperature calculation circuit, 34 ~
36... Drive circuit, 37... Comparison circuit, 38... Target damper opening calculation circuit, 39...
...Comparison circuit.

Claims (1)

[Claims] 1. A ventilation duct having an inside air intake and an outside air intake at one end and a heater outlet and a vent outlet at the other end;
an inside/outside air switching damper that selectively opens and closes the inside air intake and the outside air intake; an inside/outside air switching actuator that switches and drives the inside/outside air switching damper; and a blower fan that blows air through the ventilation duct. a blower fan speed control actuator that controls the speed of the blower fan, a compressor, a condenser, a cooling evaporator that is provided in the middle of the ventilation duct and is operated by refrigerant sent from the compressor, and turns on and off the compressor. a compressor on/off actuator, a heating heater element provided in the middle of the ventilation duct and operated by engine cooling water, an air mix damper that controls the flow rate of air passing through the heating heater element; an air mix damper actuator to be driven; an air outlet switching damper that selectively opens and closes the heater outlet and the vent outlet; an air outlet switching actuator that drives the air outlet switching damper; an outside temperature sensor that detects the outside air temperature and generates a signal in accordance with the temperature, an inside temperature sensor that detects the inside temperature of the vehicle and generates a signal in accordance with the air temperature, and the air conditioner. an evaporator outlet temperature sensor that detects the air temperature at the outlet of the evaporator lake and generates a signal in response; a water temperature sensor that detects the temperature of engine cooling water applied to the heater element and generates a signal in response; A damper opening sensor detects the opening of the air mix damper and generates a corresponding signal, and the temperature signal set by the temperature setting device is corrected by the signals generated by the outside temperature sensor and the inside temperature sensor. a target outlet air temperature calculation circuit that calculates a target outlet air temperature according to the target outlet air temperature calculated by the target outlet air temperature calculation circuit; and when the target outlet air temperature is below a predetermined value, the internal air is a drive circuit that drives the inside/outside air switching actuator to take in outside air when the temperature is higher than a value, and a drive circuit that drives the blower fan at a low rotational speed when the target blowing air temperature is in a predetermined intermediate temperature range; When the air temperature is in a temperature range lower than the intermediate temperature range or higher than the intermediate temperature range, the blower fan speed control actuator is driven to drive the blower fan at a high rotation speed. a drive circuit, a drive circuit that drives the air outlet switching actuator according to the target outlet air temperature, and a drive circuit that compares the target outlet air temperature with the output signal of the evaporator outlet temperature sensor and selects the combustor on offer. a comparison circuit that sends a control signal to the evaporator; and a target damper opening calculating circuit that calculates a target damper opening from the target blowing air temperature, the output signal of the evaporator outlet temperature sensor, and the output signal of the water temperature sensor. It is characterized by comprising a comparison circuit that compares the target damper opening calculated by the target damper opening calculation circuit with an output signal of the damper opening sensor and sends a control signal to the air mix damper actuator. Automatic air conditioning system for vehicles.