JP2000219022A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain exact judgement for prevention of cold air blow-off by controlling a blower motor to stop, when after starting an engine, the temperature of engine cooling water is lower than the reference temperature, the blow- off mode is a foot mode, and deviation of temperature in a vehicle from the set temperature is over the reference value. SOLUTION: A main controller 25 inputs the output signals of an in-vehicle temperature setter 26, an open air temperature sensor 28, a solar radiation sensor 29, an in-vehicle temperature sensor 27, and an engine cooling water temperature sensor 30, it judges whether deviation of the set temperature and the in-vehicle temperature is over the reference value or not, and in the case of the deviation over the reference value, it judges whether the blow-off mode is a foot mode or not, whether the temperature of engine cooling water is higher than the reference value or not, and whether the reference time has elapsed from starting the engine or not. When the blow-off mode is the foot mode, the temperature of the engine cooling water is lower than the reference value, and further the reference time does not elapse from starting the engine, cold air blow-off prevention is judged to be necessary, and a blower 7 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and more particularly to a vehicle suitable for a vehicle auto air conditioner (hereinafter, abbreviated as "auto air conditioner") provided with a heat exchanger using engine cooling water. The present invention relates to an air conditioner.

[0002]

2. Description of the Related Art In an air conditioner equipped with a blower for sending temperature-controlled air into a vehicle interior and a heat exchanger using engine cooling water, it is possible to prevent cold air from blowing into the vehicle interior when the temperature of the engine cooling water is low. For this purpose, the blower air volume is limited using the engine water temperature, the blowing mode, the outside air temperature or the inside temperature as a determination condition. Also, the blower air volume is gradually increased at a constant rate to a target air volume after the engine coolant temperature reaches a certain value or after a certain period of time has elapsed since the start of the engine. By such control, especially the blowing mode is set to the foot mode (hereinafter referred to as F
Expressed as OOT. ) Or a bi-level mode (a mode in which a temperature difference is provided above and below the vehicle interior; hereinafter, Bi-Lev)
expressed as el. In the case of (2), the generation of discomfort due to the cool air blowing into the vehicle interior is prevented.

[0003]

However, in the above-described conventional vehicle air conditioner, when the temperature of the engine cooling water and the outside air temperature or the temperature inside the vehicle are set to the condition for preventing the cold air blowing, the cold air blowing is not necessarily performed. Even under conditions where it is not necessary to control the air flow, there is a possibility that the blower air volume is restricted. If the blower air volume is increased at a constant and gradual rate to the target air volume due to the rise in the temperature of the engine cooling water or the lapse of time since the start of the engine, the conditions for preventing cold air blowing by changing the set temperature etc. May not reach the target air volume very easily even if is not established.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for more accurately determining whether or not to blow off cold air, and to perform control for preventing or blowing out cold air only when necessary.

[0005] Another problem is that if the condition for preventing the blow-off of the cold air is not satisfied after the control for preventing the blow-off of the cold air is started, the blower air flow is immediately increased to a predetermined target air flow, and the air flow is rapidly increased. The purpose is to allow normal air conditioning control.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, an air conditioner for a vehicle according to the present invention includes a blower for sending temperature-controlled air into a vehicle interior and a heat exchanger using engine cooling water. In the vehicle air conditioner, when a predetermined time has not elapsed since the start of the engine, the temperature of the engine cooling water is lower than a predetermined reference temperature, the blowing mode is a foot mode or a bi-level mode, and A first device is provided with a control device for stopping the blower motor when the deviation between the temperature and the temperature inside the vehicle is equal to or greater than a predetermined reference value (first device).

Further, the vehicle air conditioner according to the present invention is a vehicle air conditioner provided with a blower for sending temperature-regulated air into a vehicle cabin and a heat exchanger using engine cooling water. When the blower air volume is increased at a gradual increase rate when the predetermined temperature is equal to or higher than a predetermined reference temperature or when the engine is started, when a deviation between the set temperature and the vehicle interior temperature becomes smaller than a reference value, or ,
When the blowing mode is not the foot mode or the bi-level mode, a control device for increasing the rate of increase of the blower air volume is provided (second device).

[0008] Further, the vehicle air conditioner according to the present invention comprises:
In a vehicle air conditioner equipped with a blower that sends temperature-regulated air into the vehicle interior and a heat exchanger that uses engine cooling water, when a predetermined time has not elapsed since the start of the engine,
The temperature of the engine cooling water is lower than a predetermined reference temperature,
When the blowing mode is the foot mode or the bi-level mode, and the deviation between the set temperature and the vehicle interior temperature is equal to or higher than a predetermined reference value, the blower motor is stopped, and the temperature of the engine cooling water is equal to or higher than the predetermined reference temperature. Or when a predetermined time has elapsed since the engine started,
The blower air volume is increased at a gradual increase rate, but when the deviation between the set temperature and the in-vehicle temperature becomes smaller than the reference value, or when the blowout mode stops in the foot mode or the bi-level mode, the increase rate of the blower air volume (A third device).
Equipment).

In the first air conditioner for a vehicle according to the present invention, the determination of the prevention of the blowing of cold air is performed by using the temperature of the engine cooling water or the elapsed time from the start of the engine, the blowing mode, and the deviation between the set temperature and the temperature inside the vehicle. Therefore, all the conditions under which the blowing of the cold air is unpleasant, that is, the temperature of the engine cooling water is lower than the reference temperature, the blowing mode is FOOT or Bi-Level, and the deviation between the set temperature and the inside temperature is the reference value Only when the above conditions are satisfied, cold air blowout prevention control (blower stop) is performed. Therefore, it is possible to avoid unnecessary operation for preventing the blowing of the cool air.

In the second air conditioner for a vehicle according to the present invention, after the control for preventing the cool air blowing is started, the condition for preventing the cool air blowing is satisfied by, for example, changing the set temperature or changing the blowing mode. If it is no longer necessary (if it is no longer necessary to prevent cold air blowing)
That is, when the difference between the set temperature and the vehicle interior temperature is smaller than the reference value, or when the blowing mode is FOOT or B
When it is no longer i-Level, the rate of increase of the blower air volume, which has been gently increased in order to prevent the blowing of cold air, is increased, and control is performed so as to quickly reach the target air volume for normal control. . Therefore, the predetermined normal control can be started quickly, and comfortable air conditioning control is realized as a whole.

In the third vehicle air conditioner according to the present invention, both the functions and effects of the first and second devices can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an example of a mechanical configuration of a vehicle air conditioner used for implementing the present invention will be described. FIG. 1 is a device system diagram of a vehicle air conditioner according to one embodiment of the present invention. In FIG. 1, 1
Indicates the entire mechanical components of the vehicle air conditioner, and the inlet side of the ventilation duct 2 has an air intake amount (introduction amount) from the inside air inlet 3 side and air from the outside air inlet 4 side. An inside / outside air switching damper 5 for controlling a ratio with respect to an intake amount (introduction amount) is provided. The sucked air is sucked and pressure-fed inside the duct 2 by a blower 7 driven by a motor 6. By controlling the motor 6, the amount of air blown from the blower 7 is controlled.

An evaporator 8 as a cooler is provided downstream of the blower 7, and a hot water heater 9 as a heater is provided downstream thereof. The hot water heater 9 has
The engine cooling water 10 is circulated to heat the sucked air. Therefore, the hot water heater 9 is
The heat exchanger uses engine cooling water.

A refrigerant circulating in a cooling circuit (cooler cycle) 11 is supplied to the evaporator 8. The refrigerant is compressed by a compressor (compressor) 12, condensed by a condenser 13, sent to an evaporator 8 via a receiver tank 14 and an expansion valve 15, and is sucked into the compressor 12 from the evaporator 8. .

An air mix damper 17 is provided immediately downstream of the hot water heater 9. The air mix damper 17, which is operated by an air mix damper actuator 18, is heated by passing through the heater 9 by adjusting the opening degree of the air mix damper 17. The ratio between the amount of air and the amount of air to be bypassed can be controlled.

The temperature-controlled air is supplied to each of the outlets 19, 20,
21 (for example, defroster outlet, vent outlet, F
The air is blown into the vehicle interior through an OOT outlet. Dampers 22, 23,
24 are provided. The outlet is selected by the dampers 22, 23, and 24. In the Bi-Level mode, for example, a vent outlet and a FOOT outlet are used.

The voltage (rotation speed) of the motor 6 of the blower 7, the air mix damper actuator 18, and the clutch 16 of the compressor 12 are controlled based on signals from a main controller (control device) 25. I have.

The main controller 25 has a target vehicle temperature set by the vehicle temperature setting device 26, the outside air temperature detected by the outside air temperature sensor 28, and a solar radiation sensor 29.
, The in-vehicle temperature detected by the in-vehicle temperature sensor 27, and the coolant temperature of the engine coolant detected by the engine coolant temperature sensor 30 are input, respectively. Based on these input signals, a target outlet temperature and the like are calculated.

In such a vehicle air conditioner 1, the control according to the present invention is performed, for example, as shown in FIGS. In the flowchart shown in FIG. 2, it is determined whether or not the difference between the set temperature and the in-vehicle temperature is equal to or greater than a predetermined reference value T1 (step S1). If the difference is equal to or greater than T1, the blowing mode is FOOT or Bi-Level.
(Step S2), and whether the temperature of the engine coolant is higher than a predetermined reference value T2 (step S2).
3) It is determined whether or not a predetermined reference time t seconds has elapsed since the start of the engine (step S4). When the blowing mode is FOOT or Bi-Level, the temperature of the engine cooling water is lower than T2, and t seconds have not yet elapsed since the start of the engine (that is, when the engine cooling water is within the section A in FIG. 3). Then, it is determined that it is necessary to prevent the blowing of the cool air, and the blower (blower motor) is stopped (step S5).

If it is determined in step S3 that the temperature of the engine cooling water is equal to or higher than T2, or if it is determined in step S4 that at least t seconds have elapsed since the start of the engine, it is confirmed that the blower air volume has not reached the target air volume (step S3). S
6) The blower air volume is increased at a gradual increase rate B1 toward the target air volume as shown in section B of FIG. 3 (step S7).

In step S1, it is determined that the difference between the set temperature and the vehicle interior temperature is smaller than T1, or in step S2, the blowing mode is set to FOOT or Bi-.
If it is determined that the air level is not Level, it is confirmed that the B section control is currently being performed (step S8), and that the current blower air volume has not yet reached the target air volume (step S9). In the blowout prevention control section B, as shown in FIG.
To B2 (step S10). That is,
During the cold air blowout prevention control, when the deviation between the set temperature and the vehicle interior temperature becomes smaller due to a change in the set temperature or the like, and the cold air blowout does not feel uncomfortable, or when the blower mode that does not require the cool air blowout prevention control is activated, The air volume is increased to the target air volume as quickly as possible so that the normal control can be quickly performed. As a result, the section B is shortened, and normal comfortable air conditioning control after the section B is executed earlier.

When the section B in FIG. 3 ends, that is, in FIG. 2, it is determined in step S8 that the B section control is not being performed, or it is determined in steps S6 and S9 that the current blower air volume has reached the target air volume. Then, normal air-conditioning control is started (step S11).

By performing the control shown in FIGS. 2 and 3, it is possible to start the cold air blowing prevention control with an appropriate determination condition. According to the change of the condition, the control time for the cold air blowing prevention control can be minimized to the necessary minimum, and the comfortable normal control can be quickly started.

[0024]

As described above, according to the present invention,
The determination for the cool air blowing prevention control can be performed more accurately, and the cold air blowing prevention control can be started only when it is really necessary.

Further, when it is no longer necessary to continue the control after the start of the cold air blowing prevention control, the blower air volume can be quickly increased to the target air volume and the normal air-conditioning control can be promptly started. The generation of control time can be eliminated or greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of control of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a control state according to the flow of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 6 Blower motor 7 Blower 9 Hot water heater (heat exchanger) 10 Engine cooling water 25 Main controller (Control device) 26 In-vehicle temperature setting device 27 In-vehicle temperature sensor 30 Water temperature sensor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsuyoshi Nakajima 20 Kotobukicho, Isesaki-shi, Gunma F-term in Sanden Co., Ltd. (Reference) 3L011 AU00

Claims (3)

[Claims] An air conditioner for a vehicle, comprising: a blower for sending temperature-controlled air into a vehicle interior; and a heat exchanger using engine cooling water. A control device that stops the blower motor when the temperature of the cooling water is lower than a predetermined reference temperature, the blowing mode is the foot mode or the bi-level mode, and the deviation between the set temperature and the vehicle interior temperature is equal to or higher than a predetermined reference value. An air conditioner for a vehicle, comprising: 2. A vehicle air conditioner comprising a blower for sending temperature-controlled air into a vehicle interior and a heat exchanger using engine cooling water, wherein the temperature of the engine cooling water is equal to or higher than a predetermined reference temperature or the engine is started. When the predetermined time has elapsed, the blower air volume is increased at a gradual increase rate, but when the deviation between the set temperature and the in-vehicle temperature becomes smaller than the reference value, or when the blowing mode is the foot mode or the bi-level mode. An air conditioner for a vehicle, comprising: a control device that increases the rate of increase of the blower air flow when the air conditioner is no longer used. 3. A vehicle air conditioner comprising a blower for sending temperature-controlled air into a vehicle interior and a heat exchanger using engine cooling water, when a predetermined time has not elapsed since the start of the engine. The blower motor is stopped when the temperature of the cooling water is lower than a predetermined reference temperature, the blowing mode is a foot mode or a bi-level mode, and a deviation between the set temperature and the vehicle interior temperature is equal to or higher than a predetermined reference value, and When the temperature of the engine cooling water is equal to or higher than a predetermined reference temperature, or when a predetermined time has elapsed since the start of the engine, the blower air volume is increased at a gradual increase rate. Control that increases the rate of increase of the blower air volume when the size of the blower becomes smaller or when the blowout mode is no longer in the foot mode or the bilevel mode. A vehicle air conditioner comprising the device.