JPH0127892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car air conditioner control device that prevents a passenger from feeling cold when the heating capacity is small.

In particular, the present invention provides a car air conditioner control device that has a blowout mode in which the air discharged from the air outlet of the air conditioning duct does not directly reach the passenger, but is exclusively used to adjust the temperature of the passenger compartment. Regarding. Such a blowout mode can be obtained, for example, by manually operating a wind direction plate provided at the blowout port in a direction that avoids the passengers.
It can also be obtained by blowing out air from an air outlet that is far away from the passenger.

BACKGROUND ART Several car air conditioner control devices have been proposed in the past that compensate for the feeling of coldness experienced by passengers due to lack of heating capacity. However, all of them reduce the amount of air blown by the air blower for that purpose. In other words, on the premise that the air blown out of the air conditioning duct would reach the occupant's body directly, the amount of air blown was reduced or stopped in order to prevent the cold feeling caused by the low-temperature air directly hitting the occupant.

However, in the above-mentioned non-direct blowing mode, the amount of heat supplied to the passenger compartment is significantly reduced by reducing the heating capacity and the amount of air blown, so it is not effective in eliminating the cold sensation, and conversely, the amount of heat supplied to the passenger compartment is reduced. This results in a problem that the temperature does not rise quickly.

The present invention has been made to address the above-mentioned problems, and in the above-mentioned non-direct blowing mode,
The purpose is to provide the occupants with a feeling of warmth as much as possible.

The present invention focuses on the fact that the amount of heat released into the passenger compartment is given not only by the temperature of the released air but also by the product of the air volume, and increases the air volume when the heat exchanger cannot obtain sufficient heating capacity. By letting
It is characterized by keeping the amount of heat released into the passenger compartment as large as possible.

The present invention is suitable as a car air conditioner control device for a truck that has a nap facility located a considerable distance from the outlet of the air conditioning duct, and is particularly suitable for controlling the temperature of the cooling water depending on the environmental temperature during idling during a nap. It is even more effective when used on vehicles equipped with diesel engines, which have a significant deterioration.

The present invention will be described below with reference to embodiments shown in the accompanying drawings. In this embodiment, the present invention is applied to a known cold air mixing type automobile air conditioner. In FIG. Outside air inlet 1a for internal air circulation and inside air inlet 1 for internal air circulation
b, and both suction ports are opened and closed by an internal and external air damper 2. In the ventilation duct 1, toward the downstream side, air passes through a blower motor 3, an evaporator 4 forming part of the cooling cycle cc, a heater core 5 forming a part of the cooling water cycle HC of the engine EG, and a bypass passage 6 thereof. Temperature control dampers (A/M dampers) 7 are arranged in order to adjust the ratio to air. The most downstream part of the ventilation duct 1 is provided with upper and lower outlets 1c and 1d for blowing out the temperature-controlled air in the duct to the upper and lower parts of the vehicle interior, and both outlets are connected to an outlet damper 8. It is opened and closed by.

In order to perform temperature control and various operation mode controls, the control device 10 receives various information signals and executes processing based on a preset control program, and operates the temperature adjustment function elements 1 to 8 described above. This command is given electrically.

As a means for inputting various information to the control device 10, an interior temperature sensor 2 including a heat-sensitive resistor that generates an analog voltage signal Tr' corresponding to the temperature inside the vehicle interior.
1. Analog voltage signal according to outside temperature
Outside temperature sensor 2 including a heat-sensitive resistor that produces Tam′
2. Analog voltage signal according to engine water temperature
The water temperature sensor 23 includes a heat-sensitive resistor that generates Tw', and the analog voltage signal Ar' that corresponds to the opening degree of the temperature control damper 7 that includes a temperature-sensitive resistor that generates an analog voltage signal TE' that corresponds to the air temperature at the outlet of the evaporator 4. An opening sensor 25 including a potentiometer is provided, and a switch panel 26 is provided which generates digital signals by operating a group of switches such as temperature setting, air volume setting, and operation mode selection. The switch panel 26 also serves as a display panel.

In addition, the engine EG is used as a means for operating mechanical elements according to electrical commands from the control device 10.
an electromagnetic clutch 31 for intermittent driving force from to the cooling cycle CC; an electromagnetic valve 32 for opening and closing the cooling water circulation path to the heater core 5 in the heating cycle HC;
and negative pressure actuators 33, 34, 35 controlled by electromagnetic valves that use engine negative pressure to open and close the internal and external air damper 2, temperature control damper 7, and outlet damper 8.
is provided.

The control device 10 receives power from the vehicle battery 14 when the ignition switch 13 of the vehicle is turned on, and becomes operational.

As shown in FIG. 2, the control device 10 is a digital computer (microcomputer) that performs information processing based on a preset control program.
10a, signal input means 21, 22, 23, 24,
Analog input interfaces 10b, 10 that selectively convert analog voltage signals from 25 into analog-to-digital and input them to the computer 10a.
Immediately after the ignition switch 13 is turned on, the amplifier circuit 10c that amplifies the operation command signal of the functional elements 3, 31 to 35 outputted from the amplifying circuit 10c, the information processing clock generation circuit 10d, and the constant voltage circuit starts operating the computer 10a. It consists of an initialization circuit (none of which is shown) for starting the process.

The operation of the above configuration will be explained with reference to the calculation flowchart shown in FIG. Note that although this calculation flowchart shows the speed adjustment of the blower motor 3 according to the main point of the present invention, known techniques can be referred to for other control functions.

When the computer 10a is now in operation,
The arithmetic processing of the illustrated air conditioning control program is executed at a cycle of several hundred milliseconds. First, the signal input step
101, the A/D converter 1 is connected to the internal temperature sensor 21.
Digital room temperature signal Tr via 0b, as well as outside temperature signal Tam, water temperature signal Tw, and evaporator outlet temperature signal
Te, air mix damper opening signal Ar, and set temperature signal Tset are input and memorized, and the process proceeds to step 102 for calculating the required outlet temperature _TAO . Step 102 is a signal input step.
Required blowout temperature from the data entered and stored in 101
Calculate T _AO using the following formula.

T _AO =Kset×Tset−Kr×Tr−Kam×Tam+C However, Kset, Kr, Kam, and C are predetermined constants.

Next, in step 103, a target air mix damper opening degree Sw corresponding to the required blowout temperature determined in step 102 is calculated.

Sw=100×( _TAO −Te)/(Tw−Te−To)(%) However, To is a constant, for example, 15 (°C).

Next, in step 104, the calculated target damper opening Sw is compared with the actual damper opening Ar, and the negative pressure actuator is adjusted so that the actual damper opening Ar approaches the target damper opening Sw. Issue a command signal to 34.

Next, the process proceeds to step 105, where it is determined whether the water temperature is below 70°C, and if the judgment is NO, the process proceeds to step 108,
For example, normal airflow control as shown in FIG. 4 is performed by appropriate function calculation or memory map search. If the judgment in step 105 is YES, proceed to step 106, and the target damper opening is 100%.
If the determination is NO, proceed to step 108 and perform normal air volume control; if YES, determine the ventilation conditions under which the target damper opening is 100% and the water temperature is below a predetermined value, and proceed to step 108. Proceed to 107,
Air volume control is performed to increase the air volume to compensate for the lack of heat radiation due to the drop in water temperature. In other words, the blower terminal voltage Vb when the water temperature drops is determined by the following formula.

Vb=12×( _TAO −Te)/a(Tw−Te)(V) However, 12 indicates the normal voltage of the power supply. Also
Te is the intake air temperature of the heater core, which is the temperature detected by the evaporator outlet temperature sensor. a is the temperature efficiency of the heater core, which varies depending on its specifications, but is generally 0.7
It will be a nearby value.

The above program is repeatedly executed to adjust the temperature and the amount of air blown out. However, when the engine water temperature drops, if the air mix damper opening Ar=
If the 100% condition exists, it is assumed that the heater core is incapable of generating the required high temperature air, and the speed of the blower motor 3 (applied voltage Vb) can be increased in accordance with the engine water temperature Tw. As a result, it is possible to prevent the amount of heat released into the vehicle interior from decreasing and to prevent the temperature from decreasing significantly. At this time, if the air blown out from the air outlet does not directly hit the passenger, the passenger will not feel cold.

In carrying out the present invention, the air conditioning unit 1 uses a so-called air mix type unit as in the above embodiment, and also includes an evaporator, a heater core disposed downstream of the evaporator, and a valve that adjusts the amount of engine cooling water passing through the heater core. It is also possible to use a so-called reheat type device consisting of a valve mechanism and adjust the valve mechanism.

Moreover, the change in the amount of air blown may be continuous or stepwise.

As described above, the present invention increases the air volume when the engine cooling water temperature decreases and the heating power of the heater is insufficient, so even when the temperature of the heat source medium decreases, the temperature inside the vehicle This has the excellent effect of bringing the temperature as close as possible to the target temperature.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Fig. 2 is a block diagram of the electrical system of the embodiment shown in Fig. 1, Fig. 3 is a flowchart showing the processing of the computer in Fig. 1, and Fig. 4 shows the processing contents of step 108 in Fig. 3. FIG. 1... Ventilation duct, 1c, 1d... Air outlet, 3
. . . Blower motor (air blower), 5 . . . Heater core (heater), 10 . . . Control device, 21 .

Claims (1)

[Scope of Claims] 1. A heat exchange device including an air blower and at least a heater in an air conditioning duct, and a heat exchange device that displaces the heat-exchanged air so as not to face the passenger's normal position substantially directly. A car air conditioner control device having a blowing device capable of discharging air into the vehicle interior by means of a blowing device, comprising: temperature detection means for detecting the temperature of the heat source medium of the heater; and temperature detection means for detecting the temperature of the heat source medium of the heater; a heat exchange amount adjusting means for adjusting a heat exchange amount; the heat exchange amount adjusting means is at a maximum heat exchange position, and the temperature of the heat source medium detected by the temperature detecting means is below a predetermined value; A car air conditioner control device comprising: a determining means for determining an air blowing condition; and an air blowing amount control means for increasing an air blowing amount of the air blower when the judging means judges the air blowing condition.