JPH0231294Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an automatically controlled air conditioner that eliminates control errors caused by changes in heat load during rain and snowfall.

Conventional technology There is an automatic control air conditioner that detects the temperature inside and outside of a car and automatically controls the temperature based on this to obtain a desired set temperature.
October “Service Bulletin” published by Nissan Motor Co., Ltd.
No. 517, page E-74).

In this type of device, generally speaking, the farther the vehicle interior temperature is from the target temperature, the higher the rotation speed of the blower motor for blowing out air, and the closer the temperature is to the target temperature, the lower the rotation speed.

Problems that the invention aims to solve However, in the case of such conventional devices, the amount of heat load is calculated from the outside temperature, the amount of solar radiation, etc.
The voltage applied to the blower motor is controlled. Therefore, in the early stages of rain or snowfall, when rain or snow adheres to the vehicle body and causes a direct heat load change to the vehicle, the voltage applied to the blower motor may change when the outside temperature or amount of solar radiation remains unchanged. The blower continues to rotate at a constant rate.
For this reason, if it rains when air conditioning is mainly used for cooling, such as in the summer, the heat load decreases due to the cooling effect of the vehicle body due to the rain, resulting in excessive cooling. There was a risk that the vehicle body cooling effect would result in insufficient heating.

The present invention has been developed in view of these conventional problems, and provides an automatically controlled air conditioner that enables temperature control in response to changes in heat load during rain and snowfall.

Means for Solving the Problems In order to solve the above problems, the present invention includes a detection means for detecting physical environmental factors related to heat load and outputting them as electrical signals, and a detection means for detecting physical environmental factors related to heat load and outputting them as electrical signals. a setting means that sends out an electric signal in accordance with a setting operation by a passenger to adjust the environment of the vehicle; a blower motor that determines the amount of air to be blown; and a motor control that applies voltage to the blower motor to control the number of rotations of the blower motor. circuit, and an arithmetic and control device that performs arithmetic operations to create an optimal environment in the vehicle interior based on the output signals of the detection means and the setting means, and sends a command signal to the motor control circuit based on the arithmetic results. , an air conditioner having an automatic control mode in which the rotational speed of the blower motor is reduced as the cabin temperature approaches a target temperature determined by the arithmetic and control unit, wherein the detection means is configured to detect an amount of electricity according to the amount of rain or snow; The arithmetic and control device is configured to calculate a thermal load based on the output signal of the sensor and correct the voltage applied to the blower motor in accordance with the thermal load.

Operation In the above configuration, the arithmetic and control device performs arithmetic operations based on the electric signal from the detection means and the electric signal from the setting means to create an optimal environment within the vehicle interior, and sends a command signal to the motor control circuit. The blower motor rotates at a speed based on the command signal in order to asymptotically maintain the cabin temperature to the target temperature. When it is raining or snowing, the sensor inputs a signal as an amount of electricity corresponding to the amount of rain or snow to the arithmetic and control device. Then, the arithmetic and control device calculates a heat load that changes depending on the amount of rain or snow that adheres to the vehicle, and corrects the voltage applied to the blower motor according to this heat load.
Therefore, the rotational speed of the blower motor is controlled in response to changes in heat load due to the amount of rain or snow, and the target temperature is maintained appropriately by controlling the amount of air blown to just the right amount.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of this invention.

According to the figure, a system chamber 10, a drive device 20, a portion 30 including a detection means, a setting means, etc., and an arithmetic and control device 40 are shown.

The system chamber 10 includes an outside air introduction duct 1
1, inside air introduction duct 12, inside/outside air switching door 13,
Blower motor 14, evaporator 15, heater core 16, air mix door 17A, 17B, 17
C, and floor door 18A, ventilator door 1
8B and a defroster door 18C.
The system shown in the figure operates by operating the opening/closing and opening degree of each door 18A to 18C.
Control is executed to adjust the amount and temperature of the air from the ventilator outlet B and the defroster outlet C.

The outside air introduction duct 11 is a duct for introducing air outside the vehicle interior, and the inside air introduction duct 12 is a duct for reintroducing air inside the vehicle interior. Select whether to take in air from 12.

The blower motor 14 drives a blower fan 14A that sends air introduced from the ducts 11 and 12 into the vehicle interior. An evaporator 15 is provided immediately after the blower fan 14A to form cold air.

The heater core 16 forms warm air based on the engine cooling water and mixes it with the cold air of the evaporator 15.
Adjust the mixing ratio depending on the opening degree of C.

In addition, each element 13, 14, 17A to 17C, 18
A to 18C are operated by a passenger or automatically, and are referred to as "operating elements" in this specification as necessary.

The drive device 20 includes the aforementioned operating elements 13, 14, 1
7A to 17C and 18A to 18C, and includes a switching actuator 21, a motor control circuit 22, an opening adjustment actuator 23, and a switching actuator 24. The switching actuator 21 drives the inside/outside air switching door 13 in a predetermined switching direction based on the command signal CC1. The motor control circuit 22 determines the rotation speed of the blower motor 14 based on the command signal CC2. The opening adjustment actuator 23 is for air mix doors 17A to 1.
The opening degree of 7C is determined based on the command signal CC3.
The switching actuator 24 opens and closes the doors 18A to 18C in response to the command signal CC4, and selects one of the air outlets as described above.

The portion 30 includes a detection means for detecting a physical environmental factor related to the heat load and outputting it as an electric signal, and a detection means for outputting the electric signal according to a setting operation by the occupant in order to adjust the environment in the vehicle cabin related to the heat load. A setting means and other means are provided.

The detection means includes an outside temperature sensor that outputs an amount of electricity that corresponds to the temperature of the outside air, a room temperature sensor 32 that outputs an amount of electricity that corresponds to the temperature inside the vehicle, a solar radiation sensor 33 that outputs an amount of electricity that corresponds to the amount of solar radiation, A raindrop sensor 34 is provided that outputs an amount of electricity depending on the amount of rain or snow. As shown in FIG. 2, the raindrop sensor 34 is composed of a sensor section 50 and an amplifier section 51. The amplifier section 51 includes a charging circuit 55 and a comparison circuit 56.

Setting means include a temperature setting switch 35 for setting a desired cabin temperature and a low speed mode selection switch 36 for selecting a low speed rotation mode.
(denoted as "L mode selection switch" in the drawings) is provided.

Other means are an AD converter 38 and a temperature display device 39. The AD converter 38 converts the signals of the sensors 31 to 34 into digital signals for post-processing. The temperature display device 39 displays the temperature set by the temperature setting switch 35, and various methods such as segment display using fluorescent tubes, LEDs, liquid crystals, etc. are possible.

In this specification, "physical environmental factors related to heat load" includes not only temperature, but also humidity, solar radiation, etc., and also includes factors that affect the temperature inside the vehicle, such as vehicle speed. Included as necessary.

The arithmetic and control unit 40 sends control command signals CC1 to CC4 based on signals SS1 to SS4, CS, and LS from each detection means and setting means, etc., to create an optimal environment in the vehicle interior. That is, by controlling the switching direction of the inside/outside air switching door 13, the rotational speed of the blower motor 14, the opening degree of the air mix doors 17A to 17C, and the opening/closing state of each door 18A to 18C, using the command signal from the arithmetic and control device 40, This allows optimal air to be delivered into the vehicle interior.

The configuration of the portions of this arithmetic and control device 40 that are related to this invention is as shown in FIG. According to the figure, a heat load calculation circuit 41, an indoor target temperature calculation circuit 42, an indoor temperature difference calculation circuit 43, an air volume calculation circuit 44, and an air volume change circuit 45 are shown.

The heat load calculation circuit 41 receives an outside temperature signal SS1 given by the outside temperature sensor 31, a solar radiation signal SS3 given by the solar radiation sensor 33, and a rain/snow amount signal given by the raindrop sensor 34.
Based on the SS4 and the set temperature signal CS given by the temperature setting switch 35, the heat load amount QT is calculated.

The heat load QT is the outside temperature corresponding to the outside temperature signal SS1, Ta, and the solar radiation amount corresponding to the solar radiation amount signal SS3.
Assuming Zc, the set temperature Ts corresponding to the set temperature signal CS, the amount of rain/snow R corresponding to the rain/snow amount signal SS4, the amount of other heat such as the heat generated by the occupants as Qi, and the coefficients as K ₁ , K ₂ , K ₃ , For example, QT=K ₁ (Ta−Ts)+K ₂ Zc+K ₃ R+Qi
Find it with

The indoor target temperature calculation circuit 42 calculates, based on the output signal QT of the heat load amount calculation circuit 41, the temperature at which the interior of the vehicle should be heated in order for the sensible temperature to approach the set temperature. This target temperature signal is TRO.

The indoor temperature difference calculation circuit 43 calculates this target temperature.
Difference △ between TRO and the vehicle room temperature _TR corresponding to the current vehicle room temperature signal SS2 detected by the vehicle room temperature sensor 32
This is to calculate T.

The air volume calculation circuit 44 determines the rotational speed S of the blower motor based on the difference signal ΔT. Generally, the rotation speed of the motor is controlled so as to increase as the difference between the target temperature TRO and the vehicle room temperature _TR increases.

The air volume change circuit 45 is connected to the L mode selection switch 3
When the signal LS is input by operating 6, the output of the heat load calculation circuit 41 (heat load amount)
The air volume calculation circuit 44 calculates the air volume based on QT.
The output signal W of is changed to . As shown in FIG. 4, this calculation calculates the amount of heat load QT according to the relationship between the vehicle room temperature _TR and the set temperature T _S , and determines the voltage V applied to the blower motor 14 in accordance with this amount of heat load QT. taking into account the heat exchange amount of the air conditioner,
When the heat load is large, the blower motor 14 is made to rotate as fast as possible. That is, by operating the switch 36, the heat load QT
is input, and when Q3<QT<Q1, V=6
(V), or V when QT≧Q2, QT≦Q4
=8 (V). Q1<QT<Q2, Q4<QT
<Q3, the value will be between these.

Next, the operation of this embodiment will be explained based on the flowchart shown in FIG.

When you turn on the air conditioner switch, the system starts up and reads outside air temperature, cabin temperature, solar radiation, and set temperature from each sensor 31, 32, 33 and temperature setting switch 35 (step), and also detects rain and snow. At the time of the weather, the amount of rain and snow is read (step).

These read signals SS1, SS3, SS
4. QT is calculated in the thermal load calculation circuit 41 based on CS (step). Here, in a state without rain or snow, K ₃ R in the above equation is set to "0" and QT is calculated.Based on this signal, the calculation circuits 42 and 43 sequentially calculate the target outlet temperature (step) and calculate the temperature difference. The calculation (step) and the calculation (step) of the blowout air volume are executed.

Thereafter, it is determined whether the low speed mode selection switch 36 is in the on state (step), and if it is in the on state, the air volume changing circuit 45 forms the applied voltage V as shown in FIG. 4, for example. That is, the air volume is changed to correspond to this applied voltage V (step).

If switch 36 is not in the on state, circuit 4
4, the normal control mode continues without any change (step).

Next, during rain or snowfall, when raindrops or snowflakes hit the diaphragm 52 shown in FIG. 2, the piezoelectric element 53 linked to the diaphragm 52 vibrates according to the strength and frequency of the raindrops or snowflakes. This vibration generates a voltage in the piezoelectric element 53, and this voltage is applied to the amplifier circuit 5.
4 and stored in the charging circuit 55.
When the potential stored in the charging circuit 55 reaches a certain value Vo, the comparison circuit 56 outputs a signal from the A/D converter 3.
8, this current is digitally converted,
In the step, the frequency per fixed time is read. Therefore, K ₃ R in the above formula
is a value depending on the amount of rain/snow, and the heat load QT is calculated using this value. Therefore, when it rains when air conditioning is mainly used for cooling, such as in summer, when the heat load decreases due to the cooling effect of the car body due to rain, or when air conditioning is mainly used for heating, such as in winter, the cooling effect of the car body due to rain or snow is When this occurs, the rotational speed of the blower motor 14 is controlled to maintain the target temperature TRO asymptotically even if there is no change in the outside temperature or the like.

Effects of the invention As explained above, the present invention adds the amount of rain and snow, which is one of the physical environmental factors related to the heat load, and adds the amount of rain and snow that is one of the physical environmental factors related to the heat load. The target temperature is maintained by adaptively controlling the rotational speed of the blower motor and controlling the amount of air blown to just the right amount. This eliminates excessive cooling caused by the car body cooling effect when it rains when air conditioning is mainly used for cooling, such as in the summer, and under-heating when it rains or snows when air conditioning is mainly used for heating, such as in winter. It enables comfortable air conditioning.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the present invention, Fig. 2 is a block circuit diagram of a raindrop sensor, Fig. 3 is a system diagram showing the main parts of the same embodiment, and Fig. 4 is the same. FIG. 5, which is a control characteristic diagram of the embodiment, is a flowchart showing the operation of the embodiment. 14... Blower motor, 22... Motor control circuit, 31... Outside temperature sensor, 32... Vehicle room temperature sensor, 33... Solar radiation sensor, 34... Raindrop sensor, 35... Temperature setting switch, 40... Calculation Control device.

Claims (1)

[Scope of utility model registration request] a detection means for detecting a physical environmental factor related to the heat load and outputting it as an electric signal; a setting means for sending out an electric signal according to a setting operation by a passenger to adjust the environment in the vehicle cabin related to the heat load; A blower motor that determines the amount of air blown out, a motor control circuit that applies voltage to the blower motor to control the number of rotations of the blower motor, and an optimal environment in the vehicle interior based on the output signals of the detection means and the setting means. an arithmetic and control device that performs arithmetic operations to generate the desired temperature and sends a command signal to the motor control circuit based on the arithmetic results; In an air conditioner having an automatic control mode in which the speed is reduced, the detection means includes a raindrop sensor that outputs an amount of electricity according to the amount of rain/snow, and the arithmetic and control unit operates based on the output signal of the raindrop sensor. An automatically controlled air conditioner comprising: a heat load calculation circuit that calculates a heat load; and an air volume calculation circuit that calculates a voltage to be applied to the blower motor according to the heat load.