JP2657828B2 - Control unit for vehicle air conditioning - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air-conditioning control device in a vehicle air-conditioning device having improved driving characteristics at the time of starting heating.

(Prior art)

In a conventional vehicle air conditioner, when the cooling water temperature of the engine is less than a predetermined value at the time of heating start, since the cool air blows out, the amount of air blown out from the vehicle air conditioning device is kept to a minimum, and the cooling water temperature becomes higher than the predetermined temperature. When it reaches, the blow-off air volume is gradually increased so that the feeling is not deteriorated (see Japanese Patent Application Laid-Open No. 61-211115).

[Problems to be solved by the invention]

In a conventional vehicle air conditioner, when the cooling water temperature of the engine reaches a predetermined value or more at the time of starting heating and gradually increasing the amount of air blown out of the air conditioner, the air temperature is gradually increased based on the AUTO air amount (the amount of air blown out in the automatic control mode). Because it is designed to enter steady operation, the temperature inside the vehicle is low when heating is started, so the vehicle will be driven at the maximum air volume with a high operating sound regardless of the outside temperature, and it will take time to gradually increase to the maximum air volume. However, there is a problem that noise increases and comfortable air conditioning is not performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle air-conditioning control device that solves the above-described problems of the conventional vehicle air-conditioning device and that speeds up startup at the time of starting heating and reduces noise.

[Means for solving the problem]

In order to achieve the above object, a vehicle air conditioning control device according to the present invention provides a vehicle air conditioner that sets and controls an outlet temperature and a first outlet air volume based on at least an outside air temperature and a set temperature of an occupant. A cooling water temperature, an outside air temperature sensor for detecting an outside air temperature, and a second airflow amount smaller than the first blowing air amount when heating and when the output from the water temperature sensor is equal to or lower than a predetermined temperature. On the other hand, when the output from the water temperature sensor is equal to or higher than the predetermined temperature, the output is controlled to the third blowing air amount larger than the second blowing air amount. Control means for controlling so as to be the first blown air amount, the control means receiving a signal from the outside air temperature sensor so that the lower the outside air temperature is, the larger the third blown air amount is. Correction to correct In which has a step.

[Action]

When the cooling water temperature is lower than the predetermined value at the time of starting the heating, the control device for vehicle air conditioning of the present invention configured as described above holds the second blowing air amount smaller than the first blowing air amount, and the cooling water temperature is set to the predetermined value. When the value exceeds the value, the blown air amount is gradually increased and controlled to a third blown air amount that is larger than the second blown air amount and smaller than the first blown air amount. The lower the outside air temperature, the larger the third blown air amount. When the outside temperature is low, the occupant feels cold when the outside temperature is low, so the airflow volume is increased with priority on the heating effect, and when the outside temperature is high, the occupant feels so cold Therefore, the airflow volume is reduced by giving priority to noise suppression, and heating can be performed with a comfortable airflow volume.

〔Example〕

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

FIG. 1 is a circuit diagram of a vehicle air conditioner to which a vehicle air conditioner control device according to the present invention is applied. An evaporator 2, a condenser 3, and a receiver 4 are connected to a compressor 1 to form a cooling circuit. A heating circuit is formed by connecting a heater core 5 to a cooling water circuit, and a duct A in which the evaporator 2 and the heater core 5 are arranged.
, A blower motor 6 is arranged on the intake side, and a switching damper 7A driven by an inside / outside air switching motor 7 is provided at the intake port.

Mix dampers 8A and 8B driven by a mix door motor 8 are installed on the upstream and downstream sides of the heater core 5, respectively. The vent duct B, the differential duct C and the heat duct D Mode dampers 9A, 9B, 9C, which are controlled to be opened and closed by a mode door motor 9, are provided.

In addition, outside air sensor 10, water temperature sensor 11, solar radiation sensor 12,
Inside air sensor 13 and duct sensor 14 are arranged,
Connected to auto control unit 15.
Further, a control switch 16 is connected to the auto control unit 15.

At the time of heating start, as shown in the figure, the mix dampers 8A and 8B are located at the solid line positions and ventilate the heater core 5,
The mode dampers 9A and 9B are closed, the mode damper 9C is opened, and air is blown only from the heat duct D.

Table in FIG. 2 is a program characteristic diagram of airflow volume in AUTO air volume i.e. the automatic control mode is a first airflow volume, airflow volume on the basis of the characteristics in the automatic control mode the steady state (the blower terminal voltage V _B ) Is controlled, and the total signal T is calculated by the following equation.

T = (T _r− 25) + α (T _a− 25) + β (T _d− 12) + γ (T _d− 25) where T _r : internal temperature, T _a : outside temperature, T _d : in-duct temperature , T _d : set temperature, α, β, γ: coefficient.

The first embodiment of the present invention will be described with reference to the characteristic diagram at the time of starting heating in FIG. 3 and the flowchart in FIG.

At the time of heating start, the cooling water temperature T _W is set to a predetermined value (here,
When less than 40 ° C.) in order to remove the uncomfortable feeling of the passenger by the cold out air blowing, holding airflow volume (represented by the blower terminal voltage V _B) to the second blow-out air volume V ₀ is a minimum value, When the cooling water temperature T _W reaches a predetermined value (40 ° C.) or higher are those gradually increasing the airflow volume, where the maximum air amount after increasing in accordance with the value of the air temperature T _a sensed by the outside air sensor 10, i.e., The third blowing air amount and the continuation time which are larger than the second blowing air amount are changed.

More specifically, when the outside air temperature _Ta is low, the third blown air volume is made large, and the duration thereof is made short. Further, when the outside air temperature T _a is high, the third airflow volume smaller towns, is to the duration and time.

The heating start control characteristic l ₁ is when the outside air temperature _Ta is −10 ° C.
Blower terminal voltage V _B corresponding to the third of the blow-out air volume after the blow-out air volume gradually increases at the time of heating start-up (warm-up voltage V _W)
Is 10 V, the duration t ₁ is 4 minutes, and after the duration t ₁ elapses, the warm-up voltage V _W is reduced to 9 V. The heating start control characteristic l ₂ is such that the outside air temperature _Ta is 0 ° C. In this case, the warm-up voltage V _W is 9 V, the duration t ₂ is 5 minutes, and after the lapse of the duration t _{2, the} warm-up voltage V _W is 8 V
Is to be reduced. Heating start-up control characteristics l ₃ is the outside air temperature
If T _a is 5 ℃, the warm-up voltage V _W and 8V,
Its duration t ₃ is 6 minutes, after duration t ₃ has elapsed is intended to reduce the warm-up voltage V _W to 7V. Further, the heating start control characteristic l ₄ is when the outside air temperature _Ta is 10 ° C.
A warm-up voltage V _W and 7V, is continued until a AUTO air volume characteristics L _a (or 6 minutes) is intended.

 Next, the operation at the time of starting heating will be described.

When activating the heating, when the cooling water temperature T _W is 40 ° C. The following holds the blower terminal voltage V _B to a low value V _0, the cooling water temperature T _W is 40
If the temperature exceeds ℃, the warm-up voltage V _W is increased by [V _W + 1bit / 3
In terms of 0sec], when the outside air temperature T _a is -10 ° C. or less, the warm-up voltage V _W and 10V, to continue for 4 minutes.
Then, to fall with a gradient of 1bit / 30sec, when the warm-up voltage V _W is greater than 9V, the fall with a gradient of again 1bit / 30sec, when the warm-up voltage V _W is less than or equal to 9V, warm up voltage V _W and maintained for 45 seconds to 9V, 1bit
Fall to 8V with a slope of / 30sec.

If the outside air temperature T _a exceeds -10 ° C., and determines whether 0 ℃ less, when the outside air temperature T _a is 0 ℃ or less, the warm-up voltage V _W and 9V, continued 5 minutes Let it. Then 1 bit
/ Fall with a gradient of 30sec, warm-up voltage V _W is 8V
When it exceeds, fall again at the gradient of 1bit / 30sec,
When the warm-up voltage V _W is 8V below, warm
Maintaining 45 seconds up voltage V _W to 8V, with a gradient of 1bit / 30 sec
Fall to 7V.

If the outside air temperature T _a exceeds 0 ° C., to determine whether 5 ° C. or less, when the outside air temperature T _a is 5 ° C. or less, the warm-up voltage V _W and 8V, to continue for 6 minutes . After that, 1bit / 3
Fall with a gradient of 0sec, when the warm-up voltage V _W is greater than 7V, the fall with a gradient of again 1bit / 30sec, when the warm-up voltage V _W is below 7V, warm-up voltage V _W Is maintained at 7V, and after a predetermined time elapses,
The control is switched to the TO air volume control, and the startup control ends.

Further, if the air temperature T _a exceeds 5 ° C., the warm-up voltage V _W to the course after steady operation or maintained at 7V and 6 minutes
The control is switched to the AUTO air volume control, and the start control ends.

In the main flow chart an overall control of the indicated air-conditioning system in FIG. 5, the auto voltage V warm up voltage V _W after the air conditioner startup by AUTO air volume control
If less _A (characteristic L _a), equal blower terminal voltage V _B to the warm-up voltage V _W, compares the warm-up voltage V _W and the auto voltage V _A after kept for 1 second, warm
When up voltage V _W exceeds the auto voltage V _A performs heating operation by equalizing the blower terminal voltage V _B to the automatic voltage V _A, it is stopped after an arbitrary time.

A second embodiment of the present invention will be described with reference to FIGS.

Since the startup control characteristics are different from those of the first embodiment, and the main flowchart is the same, the description of the main flowchart will be omitted.

When the cooling water temperature T _W is lower than a predetermined value (40 ° C.) at the time of heating start, the blow air flow rate (blower terminal voltage V _B ) is kept at the second blow air flow rate V ₀ which is the minimum value, and the cooling water temperature T _W is maintained. Is the specified value (40
℃) or more, the blowing air volume is gradually increased,
At that time, when the outside air temperature T _a sensed by the outside air sensor 10 is low and the duration and short time third airflow volume as large, when the outside air temperature T _a is high, small third airflow volume and then, its is intended to be the duration for a long time, after the lapse of the third airflow volume of the duration of, directly lowering the blower terminal voltage V _B to the third airflow volume when the outside air temperature T _a is the highest It is to let.

If the heating startup control characteristic m ₁ is the outside air temperature T _a is -10 ° C., the blower terminal voltage V _B corresponding to the third airflow volume after airflow volume increasing during heating start (warm-up voltage V _W)
And 10V, its duration tau ₁ is 4 minutes. The heating startup control characteristic m ₂ when the outside air temperature T _a is 0 ° C., the warm-up voltage V _W and 9V, the duration tau ₂ is 5 minutes.
Heating activation control characteristic m ₃ in the case air temperature T _a is 5 ° C., the warm-up voltage V _W and 8V, its duration tau ₃ is 6 minutes. These heating activation control characteristic m _1, m _2, m ₃ each duration tau _{1 in,} tau _2, lowering the warm-up voltage V _W to 7V after tau ₃ elapses. Heating start control characteristic m ₄ in the case air temperature T _a is 10 ° C., the warm-up voltage
The V _W and 7V, is continued until a AUTO air volume characteristics L _a (or 6 minutes) is intended.

 Next, the operation at the time of starting heating will be described.

When activating the heating, when the cooling water temperature T _W is 40 ° C. The following holds the blower terminal voltage V _B to a low value V _0, the cooling water temperature T _W is 40
If the temperature exceeds ℃, the warm-up voltage V _W is increased by [V _W + 1bit / 3
In terms of 0sec], when the outside air temperature T _a is -10 ° C. or less, the warm-up voltage V _W and 10V, to continue for 4 minutes.
Then, to fall with a gradient of 1bit / 30sec, when the warm-up voltage V _W is greater than 7V, the fall with a gradient of again 1bit / 30sec, when the warm-up voltage V _W is below 7V, warm up voltage V _W and 7V, it maintained until steady operation.

If the outside air temperature T _a exceeds -10 ° C., and determines whether 0 ℃ less, when the outside air temperature T _a is 0 ℃ or less, the warm-up voltage V _W and 9V, continued 5 minutes Let it. Then 1 bit
/ Fall with a gradient of 30sec, warm-up voltage V _W is 8V
When it exceeds, fall again at the gradient of 1bit / 30sec,
When the warm-up voltage V _W is below 7V, warm
The up voltage V _W to 7V, to keep to a steady operation.

If the outside air temperature T _a exceeds 0 ° C., to determine whether 5 ° C. or less, when the outside air temperature T _a is 5 ° C. or less, the warm-up voltage V _W and 8V, to continue for 6 minutes . After that, 1bit / 3
Fall with a gradient of 0sec, when the warm-up voltage V _W is greater than 7V, the fall of the gradient of again 1bit / 30sec, when the warm-up voltage V _W is below 7V, warm-up voltage V _W Is maintained at 7V, and after a predetermined time elapses,
The control is switched to the TO air volume control, and the startup control ends.

Further, if the air temperature T _a exceeds 5 ° C., the warm-up voltage V _W to the course after steady operation or maintained at 7V and 6 minutes
The control is switched to the AUTO air volume control, and the start control ends.

By performing such heating start control, when the cooling water temperature reaches a predetermined temperature (40 ° C.), the airflow having a low operating sound is set to the outside air temperature without gradually increasing to the maximum airflow in the AUTO airflow control. After the elapse of a predetermined time determined in accordance with the outside air temperature, the temperature is reduced to the third blowing air volume when the outside air noise is high (10 ° C. or more), thereby ensuring a quick start-up at the time of heating startup. And reduce noise.

It should be noted that the outside air temperature and other numerical values in each of the above embodiments are not limited thereto.

〔The invention's effect〕

Since the present invention is configured as described above, the following effects can be obtained.

When the cooling water temperature reaches a predetermined temperature, the air volume is gradually increased. However, a low air volume with a low operating sound is selected as the third air volume in accordance with the outside air temperature. Can be.

In addition, when the outside air temperature is high (10 ° C or more) after a lapse of a predetermined time, the operation is performed at the maximum airflow after the gradual increase determined according to the outside air temperature.
By reducing to the third blowing air volume, it is possible to secure a quick start-up at the time of starting heating and to reduce noise.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is an overall circuit diagram of a vehicle air conditioner, FIG. 2 is a characteristic diagram of an AUTO air flow control, and FIG. 3 is a heating start control characteristic diagram of the first embodiment. FIG. 4 is a flowchart for explaining the operation, FIG. 5 is a main flowchart of the AUTO air-conditioning control, FIG. 6 is a heating start control characteristic diagram of the second embodiment, and FIG. 7 is a diagram for explaining the operation. It is a flowchart of FIG. 1 ... Compressor, 2 ... Evaporator, 3 ... Condenser, 4 ... Receiver, 5 ... Heater core, 6 ... Blower motor, 7 ... Internal / external air switching motor, 7A ... Damper, 8 ... Mixed door motor, 8A, 8B… mixed damper, 9… mode door motor, 9A, 9B, 9C… mode damper, 10… outside air sensor, 11… water temperature sensor, 12… Insolation sensor, 13 ... Inside air sensor, 14 ... Duct sensor, 15 ... Auto control unit, 16 ... Control switch, A ... Duct, B ... Vent duct, C ... Differential duct , D: heat duct, E: engine.

Claims (2)

(57) [Claims] An air conditioner for a vehicle, which sets and controls an air temperature and a first air volume based on at least an outside air temperature and a set temperature of an occupant, comprises a water temperature sensor for detecting a cooling water temperature of an engine; While controlling the outside air temperature sensor to be detected and the second blowing air volume lower than the first blowing air volume when the output from the water temperature sensor is not more than a predetermined temperature during heating and from the water temperature sensor, Control means for controlling the third blow-off air flow rate to be larger than the second blow-off air flow rate when the output is equal to or higher than a predetermined temperature, and controlling the first blow-off air flow rate when a predetermined state is reached. Wherein the control unit has a correction unit that receives a signal from the outside air temperature sensor, and corrects the third blown air volume to be larger as the outside air temperature is lower. Vehicle air conditioning control Location. 2. A vehicle air conditioner for setting and controlling an air temperature and a first air volume based on at least an outside air temperature and a set temperature of an occupant, wherein a water temperature sensor for detecting a cooling water temperature of an engine; While controlling the outside air temperature sensor to be detected and the second blowing air volume lower than the first blowing air volume when the output from the water temperature sensor is not more than a predetermined temperature during heating and from the water temperature sensor, Control means for controlling the third blow-off air flow rate to be larger than the second blow-off air flow rate when the output is equal to or higher than a predetermined temperature, and controlling the first blow-off air flow rate when a predetermined time has elapsed, The control means has a correction means for controlling the third blown air volume to be larger as the outside air temperature is lower, and for correcting the control time based on the third blown air flow to be shorter. Features Vehicle air-conditioning control device according to claim 1 that.