JP2601047Y2 - Vehicle air conditioning controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning control device, and more particularly to a vehicle air conditioning control device capable of estimating the inside air temperature when its inside air sensor fails.

[0002]

2. Description of the Related Art Conventionally, a vehicle air-conditioning control device detects parameters such as an inside air temperature, an outside air temperature, and an amount of solar radiation, and based on these parameters, the number of rotations of a blower, the amount of rotation of an air mix damper, and a blowing mode to be selected. By controlling the air conditioner and the like, the interior of the vehicle is air-conditioned to a desired state. In this case, each of the parameters is detected based on a corresponding inside air sensor, outside air sensor, solar radiation sensor, or the like.

[0003]

By the way, in the air-conditioning control device, when the inside air sensor fails, the air-conditioning control is performed by uniformly setting the temperature inside the vehicle to, for example, 25 ° C. Therefore, the temperature inside the car is high,
Even when the occupant feels hot, there has been a problem that the number of rotations of the blower is reduced and the amount of air blown is reduced, or the air temperature is not lowered. The present invention has been made in view of the above problems, and has as its object to provide a vehicle air conditioner that can perform desired air conditioning control even when an inside air sensor fails.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a vehicle air conditioner in which the inside of a vehicle is air-conditioned by controlling the driving of a blower, a compressor, an air mix damper, and the like based on internal and external conditions. In the control device, the inside air sensor failure detecting means for detecting the failure of the inside air sensor, and the compressor is turned off and set to the inside air circulation mode based on the failure detection signal from the inside air sensor failure detecting means. And an inside air temperature estimating means for estimating the inside air temperature from a change in the temperature detected by the evaporative sensor provided downstream of.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. In the air-conditioning control device for a vehicle shown in FIG.
5, heater cores 6 and the like are sequentially arranged. An evaporator 7 is attached downstream of the evaporator 4, and an inside air sensor 8 is provided at the foot of the front part in the vehicle. Detection signals from the solar radiation sensor 9 and the outside air sensor 10 in addition to the two sensors 7 and 8 are input to the CPU 11.
The CPU 11 performs a predetermined calculation process, and
2. By transmitting control signals to the compressor 13 and the actuators 14 and 15, respectively, the number of rotations of the blower 3, the amount of refrigerant circulating to the evaporator 4, and the rotation angles of the intake damper 2 and the air mix damper 5 are controlled.

The inside air sensor 8 is connected to a inside air sensor failure detecting section 16. The inside air sensor failure detection section 16 detects a failure state based on an input signal from the inside air sensor 8. For example, when a thermistor is used for the inside air sensor 8, if the resistance is cut off, the input voltage becomes maximum. Therefore, a failure is detected based on the input voltage.

An inside air temperature estimating unit 17 is connected to the inside air sensor failure detecting unit 16. The inside air temperature estimating unit 17 estimates the inside air temperature as described below based on the failure detection signal from the inside air sensor failure detecting unit 16 and the temperature detected by the evaluation sensor 7 from the CPU 11.

That is, as shown in the flowchart of FIG. 2, it is determined in step S1 whether or not there is a failure detection signal from the inside air sensor failure detecting section 16. The process proceeds to step S6 if it is determined that there is no failure.

In step S2, the circulation of the refrigerant is stopped by turning off the compressor 13, and the compressor 1 is turned off.
The cooling at 3 is temporarily stopped. In addition, intake door 2
As shown by the solid line in FIG.
Switch to C) to circulate inside air. Immediately after this, the temperature near the downstream side of the evaporator 4 (hereinafter referred to as the evaporator temperature) is detected by the evaporator sensor 7. Then, if a predetermined time has elapsed in step S3, the evaporation temperature is detected again in step S4.

Subsequently, in step S5, the temperature gradient is calculated based on the two evaporation temperatures to estimate the inside air temperature. Here, as described above, since the evaporator temperature is strongly influenced by the inner air temperature due to the stop of the cooling in the evaporator 4 and the circulation of the inner air, the inner air temperature is estimated from the change in the evaporator temperature (temperature gradient). .

More specifically, the amount of air passing through the evaporator 4 is determined by the number of revolutions of the blower 3, the sectional area of the unit 1, and the like, and the degree of influence on the evaporator temperature is determined by the size of the evaporator 4 and the like. Based on this, it is set in advance how many seconds after the temperature change within the predetermined time the value will be close to the inside air temperature, and the change in the air temperature is multiplied by this time.

If the inside air temperature is estimated in this way, input signals from the other sensors 9 and 10 are received in step S6, and in step S7, the rotation of the blower 3 is determined from these input signals in the same manner as in the prior art. The number, the rotation angle of the air mix damper 5, the blowing mode to be selected, and the like are determined.
At 8, a control signal is output. When a failure of the inside air sensor 8 is detected, it is preferable that the inside air temperature is estimated at predetermined time intervals and the failure is notified to a driver or the like by a lamp or the like.

[0013]

As is clear from the above description, according to the vehicle air conditioner of the present invention, even if the inside air sensor fails, the inside air temperature estimating means stops the compressor and stops the cooling by the evaporator. In this state, the inside air is circulated, and the inside air temperature is estimated based on the change in the temperature detected by the evaporative sensor. Therefore, it is possible to maintain a more appropriate air-conditioning state than before.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioner according to an embodiment.

FIG. 2 is a flowchart illustrating air conditioning control in the vehicle air conditioner of FIG. 1;

[Explanation of symbols]

1 unit, 4 evaporator, 7 evaporator, 1
3 Compressor, 16 Inside air sensor failure detection unit (inside air sensor failure detection means), 17 Inside air temperature estimation unit (inside air temperature estimation means).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumio Sugawa 5658 Yoshikawa, Hachihonmatsu-cho, Higashihiroshima-shi, Hiroshima Japan Climate Systems Co., Ltd. Japan Climate Systems Co., Ltd. (56) References Japanese Utility Model Sho 63-64508 (JP, U) Japanese Patent Publication No. 60-27905 (JP, B2) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B60H 1/00 F25D 49/02

Claims (1)

(57) [Scope of request for utility model registration] An air conditioning control system for a vehicle which controls the air conditioning of a vehicle by controlling the driving of a blower, a compressor, an air mix damper and the like based on various internal and external conditions. The compressor is turned off based on the failure detection signal from the inside air sensor failure detection unit and the inside air circulation mode, and the inside air circulation mode is set. The inside air circulation mode is set based on a change in the temperature detected by the evaporator sensor provided downstream of the evaporator in the unit. An air-conditioning control device for a vehicle, comprising: inside air temperature estimating means for estimating a temperature.