JPS5920719A - Controller for car air conditioner - Google Patents

Abstract

PURPOSE:To prevent a delay in a temperature rise in a car calin from occurring, by so constituting that a heating capacity detector for a heat exchanger is connected with a controller and they are made into a mode of using together when heating capacity is less than a required value, in the titled device of automatic blow-off mode changeover type and automatic temperature adjusting type. CONSTITUTION:An electric controller 10 sets a blasting air quantity at zero when a cooling water temperature TW of an internal combustion engine is less than a first given value, the blasting air quantity is decided independently as a function of the water temperature TW when the water temperature TW is more than the first given value and less than a second given value and the blasting air quantity is increased proportionally according to a rise of the water temperature. An output signal is applied to an amplifier 21 so that the blasting air quantity determined by blasting air quantity adjusting disposition is obtainable when the water temperature TW is more than the second given value. With this constitution, a car cabin tempereture can be raised promptly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control device that has an automatic temperature control function and also automatically switches the blowout mode. The present invention is applied to an electric control device that includes at least a heating device and adjusts the heating temperature thereof.

In such a car air conditioner control device, when heating the vehicle, it is important to determine whether the heat source has sufficient heat generation capacity and whether the rise in heat generation, that is, the temperature rise, is fast. In automobiles, the driving engine is mainly an internal combustion engine, so the cooling water of the internal combustion engine is often not used as a heat source, but when the outside temperature is low, such as in winter, the temperature rise is naturally slow, and the heating effect is quickly achieved. The problem is that they are unable to fully demonstrate their abilities.

Generally, car air conditioners include a blower that can adjust the air flow rate, a heat exchanger that can adjust the air temperature, and a switchable outlet that can be selected between at least a defroster blowout mode, a vent blowout mode, and a heater blowout mode. equipment. Further, known car air conditioner control devices including these automatic control devices are provided with a function of stopping the blower until the temperature of the cooling water of the internal combustion engine reaches a sufficient value. In other words, if the blower is activated when the cooling water temperature is low, cold air may be directed toward the occupants, and even though the heating effect may not be achieved, even slightly warmed air may turn into wind and hit the occupants. This is to prevent the user from feeling cold and having the opposite effect.

However, in known devices, stopping the air blowing until the cooling water temperature reaches a predetermined value means that the amount of heat supplied to the passenger compartment will be reduced by the amount of air volume that is reduced, so the overall air temperature in the passenger compartment will be reduced. It does not have a delaying effect on the rise in

The present invention has been made in view of the above-mentioned background, and by increasing the air volume without giving the occupants a cold sensation, the amount of air heat supplied to the vehicle interior is increased, and the temperature inside the vehicle interior is lower than that of the internal combustion engine. The purpose is to increase the temperature by making the most of it.

For this reason, the present invention detects the heating capacity of the heat exchanger, and until the heating capacity reaches the required value, the defroster blowout and heater blowout modes are used in combination to reduce the amount of air directed toward the occupants and to reduce the amount of air flowing into the passenger compartment. It is characterized by supplying somewhat warmed air.

The attached drawings show an embodiment of the present invention, and FIG. 1 shows its overall configuration. Reference numeral 1 indicates an air conditioner duct, which is equipped with an internal/external air introduction switching damper 2 upstream, and inside which adjusts the amount of air blown. A heat exchanger 4 whose air temperature can be adjusted by means of an electric blower 3 and an air mix damper 5 is disposed, and a damper 6.7.8 for selecting a blowing mode is provided downstream. The heat exchanger 4 is of a known type that circulates cooling water for an internal combustion engine, and if necessary, may be combined with a refrigerant compression-expansion type refrigeration cycle and have an evaporator for the same.

In the dampers for selecting the blowout mode, 6 is a heater damper that opens and closes the heater blowout port IB connected to the duct 1, and the vent damper 7 opens and closes the vent blowout port IA and the defroster blowout port IC. 8 opens and closes the defroster outlet IC. By selectively operating these three dampers, (1) Heater blowout mode: Air is blown out from the heater blowout port IB.

(2) Vent blowout mode: Air is blown out from the vent blowout port IA.

(3) Defroster blowout mode; Defroster blowout 1 outlet IC
Blow out more air.

(4) Combined mode: Air is blown out from heater outlet IB and defroster outlet IC. (Situation as shown) - Note that in the heater blowout mode, due to the mechanical structure, not only the heater blowout port IB but also the defroster blowout port IC
It is known that about 20% of the air is blown out at the same time, but it is also possible to do so. In the combination mode of this embodiment, the damper operation increases the air blowing rate from the defroster blowout port IC to approximately 30 to 70%.

The operation of this device as an air conditioner is controlled by the electric control device 10.
It is now controlled by.

The electric control device IO is connected to the operation panel, and uses its operation switch to set a target temperature for adjustment in the vehicle interior, and receives human power signals from temperature sensors 12 to 15 to determine the state to be adjusted of each component of the air conditioner. and generates a corresponding output signal. In this example, the temperature sensors 12 to 14 include a water temperature sensor 12 that responds to the coolant temperature of the internal combustion engine, a room temperature sensor 13 that responds to the air temperature in the vehicle interior, and an outside air temperature sensor 14 that responds to the outside air temperature. Electrical control device IO
The output signal from is applied to an electromechanical actuator 16-2o coupled with a suitable amplifier, thereby actuating each damper. It is also applied to the power amplifier 21, thereby operating the blower 3.

The electric control device 10 is configured using a microcomputer, and operates the air conditioner by executing the control program shown in FIG. , adjust the airflow rate, and select the blowout mode. When selecting the blowout mode, if the device is operating in heating mode, the second
As shown in the figure, the blowing mode is uniquely determined according to the value of the cooling water temperature Tw, and the air blowing amount ■ is also determined within a range of values larger than the value conventionally set as the suppression value.

Explaining according to the control program shown in FIG. 3, the electric control device 10 is supplied with power by turning on a main switch (not shown), and starts processing from step 22. The control program includes a signal input step 23. Signal input step 23
This includes a process of storing the target temperature by operating the operation panel 11, and a process of processing and storing the signals from the temperature sensors 12 to 14. Based on the signals obtained in this way, temperature joint processing 24, air volume adjustment processing 25, inside/outside air introduction switching processing 26, and blowing mode switching processing 27 are all well known, so they will not be described in detail here. Don't explain. Through these series of processes 24 to 27, the output signal to be generated by the electric control device IO is determined, and the actual output is performed in the final step 33. Therefore, when a new adjustment amount or mode is determined in steps 28 to 32 described below, the apparatus operates in accordance with the latest determination.

Steps 28 to 32 are processes performed when the temperature of the cooling water of the internal combustion engine is low, and this embodiment shows the case where the heat exchanger 4 is used only in the heating mode. If the heat exchanger 4 includes an evaporator and is also used in the cooling mode, a step of determining the state in which it is used in the cooling mode is set after step 28, and in the cooling mode, ° is
The processing from steps 28 to 32 may be passed.

Steps 28 to 32 will be explained. First step 2
In step 8, it is determined whether the cooling water temperature Tw is equal to or lower than a preset first value, for example, 30°C.

If the temperature is 30° C. or lower, the value to be output of the air flow rate is newly set to zero in step 29. Therefore, if the heating capacity of the heat exchanger is absolutely insufficient, the air blowing is completely stopped.

In step 30, the cooling water temperature TW is set at a second
For example, it is determined whether the temperature is 50° C. or higher. If 50℃
If the above is the case, the output step 33 is executed as is, and an output signal is given to the amplifier 21 in order to obtain the air volume determined in the air volume adjustment process 25.

However, if the temperature is less than 50°C, the process jumps to step 31 and independently determines the temperature as a function of the air volume and perfume temperature Tw.

In this case, the air volume is determined to increase proportionally as the water temperature Tw increases. Next, in step 32, a combination mode is set as the blowout mode. Therefore,
When the heat exchanger 4 has a certain heating capacity of 30° C. to 50° C., air is supplied into the vehicle interior with a slightly larger amount of air from both the defroster outlet IC and the heater outlet IB. At this time, although the amount of wind that directly hits the occupants is small, a large amount of air is sent throughout the vehicle interior, so the air has a large amount of heat, allowing the temperature inside the vehicle to rise more quickly to the target temperature. is effective.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment and may be modified as desired based on the spirit of the claims.

As described above, according to the present invention, the temperature inside the vehicle can be quickly raised to the target temperature by increasing the amount of air supplied to the vehicle interior without making the occupants feel cold. effective.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing its operation, and Fig. 3 is an electric control device l in Fig. 1.
This is a microcomputer control program that shows the operation of O. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] A blower that can adjust the air flow rate, a heat exchanger that can adjust the air temperature, and an air outlet between at least a defroster blowing mode, a vent blowing mode, a heater blowing mode, and a combination mode of defroster blowing and heater blowing. a switching device that can be selected at , a detector that detects the heating capacity of the heat exchanger, and a control device that controls the blower, the heat exchanger, and the switching device, and the control device is connected to the detector. A car air conditioner control device, wherein the switching device selects the combination mode when the heating capacity is less than a required value.