JPS6029318A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To protect passengers from cool air jet by controlling a jet port opening and closing mechanism when detected air jet temperature is lower than a predetermined value, jetting air only from the jet port for a defroster and setting jet air amount to a predetermined low air amount. CONSTITUTION:When an air conditioner is set to AUTO mode and started, respective output signals of an atmospheric temperature sensor (not shown), cooling water temperature sensor 31, foot duct sensor 34 and differential duct sensor 35 are taken into a controller 27. And when the atmospheric temperature is lower than a predetermined value, heating control is started. First, defroster jet temperature Tdd is compared with operation setting temperature Td1. When the Tdd<Td1, a predetermined LO voltage is applied to a blower motor 4 through an amplifier 28 to rotate a fan 5 with low speed. And simultaneously the operation mode is set to DEF mode and an air mix door 8 is fully closed so that the whole air passing by a heater core 10 is jetted from a defroster jet port 13 through a differential door 11 fully opened.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vehicle air conditioner, and in particular, when the heater is activated when the engine cooling water temperature is low, it prevents cold air from blowing to the feet and cools the vehicle. This invention relates to an air conditioner for a vehicle in which even if the water temperature is low, only the defroster is activated to prevent fogging of window glass due to body heat, steam, etc. emitted from the body of an occupant.

(Prior art and its problems) As a conventional vehicle air conditioner, there is an example of a conventional vehicle air conditioner, as described in Account Service Bulletin No. 360 (2-11), P29, published in August 1978.
8 to P290. This air conditioner is
As shown in FIG. 1, air is mixed and taken in from the inside air intake 2 and the outside air intake 3 according to the degree of opening and closing of the intake door 1. Along with blowing air in the direction,
After passing through the evaporator 7 of the cooling unit 6, it is divided into a component that passes through the heater core 10 of the heater unit 1-9 and a component that bypasses this, depending on the degree of opening and closing of the air mix door 8, and these components are re-distributed. Mix to obtain the final temperature conditioned air.

Next, this temperature-adjusted air is sent to the defroster duct 12 via the defroster door 11, and finally blown out into the vehicle interior from the defroster outlet 13, thereby preventing fogging of the window glass.

Further, the temperature-adjusted air is sent into the foot duct 15 via the floor door 14, and finally blown out from the floor outlet 16 to the driver's feet.

Furthermore, the temperature-adjusted air is blown out into the vehicle interior from a vent outlet 18 via a vent door 17.

On the other hand, the doors 1.8.11.14 and 17 are remotely controlled to open and close via negative pressure actuators 19, 20, 21, 22 and 23, respectively.

Each of the solenoid valves 24 to 26 is driven to open and close by a signal from a controller 27 composed of a microcomputer, and the blower motor 4 can adjust the amount of air blown according to a signal similarly supplied from the controller 27 to a fan motor amplifier 28. It is composed of

On the other hand, as shown in FIGS. 1 and 2, a water temperature sensor 31 such as a thermistor is inserted into a cooling pipe 30 that circulates between the engine 29 and the heater core 10 of the heater unit 9. The output of 30 is taken into the controller 27. In addition, in Figure 2, 32
is a radiator, and 33 is a thermostatic valve.

Next, in this vehicle air conditioner, ECONOMY
, 10. AUTO, Hl, BI=LEVel and DE
It has a plurality of operating modes such as F, and these modes can be selected using a mode setting button provided on an instrument panel (not shown).

Further, the desired temperature can be similarly set using the density adjustment camera provided on the instrument panel.

In any operating mode, temperature control is based on temperature changes detected by an inside air sensor (not shown) installed on the top of the instrument panel and an outside air sensor (not shown) installed inside the front bumper. The temperature is automatically controlled by comparing the temperature with the desired temperature set during adjustment shooting and automatically opening and closing the air mix door 8.

In particular, in the AUTO mode, in addition to the temperature control described above, the differential door 1
1. By opening and closing the floor door 14 and the vent door 17 as appropriate, an appropriate outlet is automatically selected and controlled in accordance with the outlet temperature.

By the way, in conventional vehicle air conditioners of this type, if the engine cooling water temperature detected via the water temperature sensor 31 has not risen to a predetermined value required for the heater unit 9, the power supply to the pro-armotor 4 is stopped. The system is configured to stop and prohibit the blowing of cold air from each of the air outlets 13, 16 and 18, thereby preventing the cold air from blowing onto the driver's feet or the like.

However, with this configuration, if you get into a parked car on a cold winter morning, start the engine, and set the air conditioner to AUTO mode, there is no need to worry about cold air blowing out from under your feet. However, on the other hand, since the proa fan 5 does not rotate, the interior of the vehicle is not ventilated at all, and as a result, it is thought that the window glass may fog up due to body heat and steam emitted from the occupants' bodies.

(Objective of the invention) The object of the invention is, for example, on a cold winter morning, to get into a parked vehicle, start the engine, and
The objective is to prevent the risk of cold air blowing out to the occupants when the heater is operated in AUTO mode, and at the same time to prevent the windows inside the vehicle from fogging up.

(Structure of the Invention) The present invention will be described in detail with reference to the claim correspondence diagram shown in FIG.

In the figure, a blower a sends air into the vehicle interior.

The heat exchanger is inserted into the air blowing path and raises the temperature of the air while circulating the cooling water d of the engine C.

A plurality of air outlets e are provided at various locations within the vehicle interior, and are for blowing out air heated by the heat exchanger.

The air outlet opening/closing mechanism f is configured such that among the plurality of air outlets e,
This is a mechanism that allows the defroster outlet and other outlets to be opened and closed separately.

The blowout temperature detection means 9 detects the air blowout temperature from any one of the air blowout ports e.

The low temperature blowout control means controls the blowout opening/closing mechanism f to blow air only from the defroster blowout when the air blowout mW detected by the blowout temperature detection means g is below a predetermined value. It has a function of blowing air and setting the blowing air gap to a predetermined low air volume.

(Description of Embodiments) Fig. 4 is a diagram mainly showing the air conditioning system of the vehicle air conditioner according to the present invention, Fig. 5 is a piping system diagram of the engine cooling water showing the installation state of the water temperature sensor, and Fig. 6 is 3 is a flowchart illustrating an example of a control procedure executed by a controller.

In FIG. 4, the same components as those in FIG. 1 are given the same reference numerals and their explanations are omitted, but just to be sure, the configuration of the main parts of the present invention will be described for reconfirmation.

Proa fan 5 is a fan for sending air into the passenger compartment.
Corresponds to illN.

The heater core 10 is a heat exchanger that is inserted into the air passage of the air sent by the proa fan 5, and heats the air while circulating the cooling water of the engine 29, as shown in FIG.

Defroster air outlet 3. The floor outlet [116] and the vent outlet 18 correspond to a plurality of air outlets that are provided at various locations in the vehicle interior and blow out air that has been heated in the heat exchanger.

Differential door 11. The floor door 14 and the vent door 17 are the defroster air outlet 1 among the plurality of air outlets.
This corresponds to an air outlet opening/closing mechanism that can open and close the air outlet 3 and the other air outlets 16 and 18 separately.

Furthermore, the difference between FIG. 1 and FIG. 4 according to the present invention is as follows.
A foot duct sensor 34 is provided in the foot duct 15, and the foot duct sensor 34 detects the air blowing temperature. The rest of the configuration is the same as in FIG. 1 except for the software processing within the controller 27.

Next, the operation of the apparatus of the present invention described above will be explained. First, when the air conditioner is started and set to AUTO mode, step (10) is performed in the flowchart of FIG.
0) is executed, and it is determined whether the temperature detected by the outside air sensor (not shown) provided inside the front bumper is below a predetermined value.Here, this determination result is N.

If YES, cooling control is performed, and if YES, heating control is performed.

Next, in the case of heating control, step (101) is executed, and a comparison is made between the defroster outlet temperature Tdd and the operation set temperature Td+.

, Here, if it is determined that Tdd≦Td+, then step (102>) is executed, the signal from the controller 27 is sent to the fan motor amplifier 28, and the blower motor 4 is given a predetermined LO lightning voltage. , Proafan 5
is fixed at a predetermined low rotation speed.

Further, at this time, the operation mode of the air conditioner is set to DEF mode. Then, as shown in FIG. 7, the air mix door 8 is completely closed and all the blown air passes through the heater core 10, and the actuator 21
．． Due to the actions of 22 and 23, the floor door 14 and vent door 18 are completely closed, while the differential door 11 is in the full state. As a result, air that has not yet been sufficiently warmed is blown out from the defroster outlet 13 in the vehicle interior at a relatively weak air volume, thereby preventing the window glass from fogging up.

Therefore, if you get into a parked car on a cold winter morning, close the door, and operate the air supply system in AUTO mode, the cold air blown out due to the low engine coolant temperature will be transferred to the defroster. Since the air is blown only from the air outlet 13 and not from the vent air outlet 18 or the floor suita 016, the cold air is not blown onto the occupants and makes them feel cold.

Furthermore, since the pro-a-fan 5 is rotating at a predetermined low speed at this time, the amount of air blown out from the defroster Suita port 13 is also small as described above, thereby preventing the concentration in the vehicle interior from lowering more than necessary.

Next, the engine cooling water rises and Tdd>Td
If the value becomes +, step (103) is subsequently executed, and a comparison is made between the defroster Suita temperature detected by the defroster duct sensor 35 or the floor air temperature TdL) detected by the foot duct sensor 34 and the predetermined operation setting mTd2. will be carried out.

Here, if it is determined that (Tdd or Td L)≦Tdz, then step (104) is executed, and the applied voltage of the proar motor 4 remains fixed at LO, but the operation mode is switched to HEATER mode. .

Then, as shown in FIG. 8, in addition to the vent door 11 which had been open until then, the foot door 14 also opened slightly.
As a result, relatively low-humidity warm air is blown out from the floor Suita outlet 16 as well. At this time, the air volume is maintained at a predetermined low ffl amount as described above, so even if the air temperature is low, there is no risk of making the user feel very cold.

Furthermore, the engine cooling water temperature rises, which causes (Td
d or Td L) also increases, Tdd or Td
When L)>Td2, step (105) is subsequently executed, and the voltage applied to the proar motor becomes a value corresponding to the room humidity, etc. determined at the time in the automatic mode, and
The operation mode is also switched to ALITO mode.

Then, as shown in FIG. 9, the differential door 11 is kept fully open, the foot door 14 is kept open, and the amount of air blown from the defroster outlet 13 and floor outlet 16 is reduced. Optimally controlled to maintain the set temperature from time to time. Furthermore, this AU
The details of automatic control in the TO mode are well known in the above-mentioned conventional literature, and therefore will not be described in detail.

As described above, according to the embodiment described above, when the air conditioner is operated in AUTO mode after getting into a parked vehicle and closing the door on a cold winter morning, the engine When the cooling water temperature is low, the cold air caused by this will never blow out from the floor outlet 16 or the vent outlet 18, so the occupants will not feel cold, and the cold air will not blow out from the defroster outlet 13. By blowing out cold air with a small amount of Mffi, even if the doors and windows are closed, there is no risk of the window glass fogging up due to the heat and steam emitted by the occupants, making it possible to start the vehicle as soon as you get into the vehicle. Become.

In addition, once the engine has started, the engine cooling water temperature rises rapidly, so when it reaches the required temperature, slightly warm air will begin to blow out from the floor outlet 16 at a relatively low air volume, and then the engine cooling water temperature will rise. Only after the temperature of the blown air rises sufficiently and the temperature of the blown air rises sufficiently, the well-known ALITo mode is executed for the first time, and the feed ff1l! according to the set temperature at that time is executed. And warm air will be blown out from the blowing position.

In the above embodiment, after the cooling water temperature exceeds the operating set temperature TW+, the switch to the ALJTO mode is performed based on the floor outlet temperature TdL detected by the foot duct sensor 34. Of course, as shown in step (103A) in FIG. 10, this may be done by comparing the magnitude of the cooling water ITW and the corresponding operation setting ITW2.

Further, in the above embodiment, the present invention has been described in a relatively high-grade air conditioner equipped with a cooling unit 6 in addition to a heating unit 9, but the application of the present invention is not limited to this. It goes without saying that the present invention can also be applied to a heating-only machine in which the air blown is directly guided to the heater core 10 and then sent to each outlet.

Furthermore, in the above embodiment, when the cooling water temperature Tw is lower than TW+, the blower motor 4 is rotated at a low speed as a means to reduce the amount of air blown. A similar effect can be obtained even if a continuously adjustable damper or the like is provided to adjust the weight of each outlet.

(Effects of the Invention) As is clear from the description of the embodiments above, according to the present invention, on a cold winter morning, you can get into a parked vehicle, close the doors and windows, tJ T
When the air conditioner is started in O mode, air will not blow out from the floor outlet until the engine coolant temperature is sufficiently warmed up, causing cold air to be blown onto the passengers and making them feel cold. In addition, there is relatively low I from the defroster outlet 13! Air blows out at 111, causing fogging on the window glass.
Therefore, as soon as the driver gets into the vehicle and turns on the air conditioner, he or she can immediately start the vehicle without any problems. Moreover, especially in this invention, since the actual blowing temperature itself is detected and controlled, it is possible to reliably prevent cold air from blowing out.

[Brief explanation of drawings]

Fig. 1 is an air conditioning system diagram of the conventional device, Fig. 2 is a piping system diagram showing the mounting position of the water temperature sensor, Fig. 3 is a diagram corresponding to the claims of the present invention, and Fig. 4 is an air conditioning system diagram of the device of the present invention. Figure 5 is a cooling piping system diagram showing the installation state of the water temperature sensor, Figure 6 is a flowchart showing the control procedure in the controller, and Figure 7 is a diagram of each outlet door when the engine cooling water temperature is below a predetermined value. Figure 8 is a diagram similar to Figure 6 in a state where the floor outlet temperature is below a predetermined operating contact point, and Figure 9 is a diagram showing the open/closed state when the floor outlet temperature exceeds a predetermined operating contact point. No. 6 showing the status of each outlet door.
FIG. 10, which is similar to the above figure, is a flowchart showing another example of the control procedure in the controller. 5... Pro fan 10... Heater core 11... Defroster door 13... Defroster outlet 14... Floor door 16... Floor outlet 17... Vent door 18... Vent outlet 27... Controller 31... Water temperature sensor 29... Engine patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] (1) A blower for sending air into the vehicle interior; a heat exchanger that is inserted in the air blowing path and heats the air while circulating engine cooling water; and a heat exchanger that is installed at various locations in the vehicle interior, and a plurality of air outlets for blowing out air heated by the heat exchanger; an outlet opening 1Vff that can open and close a defroster outlet and other outlets separately among the plurality of air outlets; a mechanism; a detection means for detecting an air blowing temperature at any one of the air blowing ports; when the detected air blowing temperature is below a predetermined value,
A vehicle air conditioner comprising: low temperature Suita control means for controlling the Suita mouth N leap mechanism to blow out air only from the defroster outlet and setting the Suita air volume to a predetermined low air volume. Device.