JPH0733125B2 - Automotive air conditioner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a vehicle air conditioner.

2. Description of the Related Art In recent years, the number of revolutions of a driver has been reduced by automatically controlling the rotational speed of a mix damper or blower motor that adjusts the temperature of air blown into the vehicle interior based on information from various sensors installed inside and outside the vehicle interior. , Air conditioning control with improved safety and comfort is performed. Since these controls are performed by the information of various sensors, comfortable air conditioning cannot be performed when the sensors are abnormal. Especially, the abnormality of the outside air sensor
Seriously affect control. Therefore, if an abnormality of the outside air sensor is detected, the input value of the outside air sensor is controlled to be fixed at a preset temperature.

A conventional air-conditioning system for an automobile of this type is, for example, the actual Kaisho Sho 60-
There is one as shown in Japanese Patent No. 81013.

FIG. 5 is a block diagram of a conventional automobile air conditioner. Analog signals from the temperature setting device 1, the inside air sensor, the outside air sensor 8 and the like are converted into digital signals by the analog signal input unit 2 and input to the arithmetic unit 3. In addition to this, digital signals such as an A / C switch and a fan switch are also input to the arithmetic unit 3. The computing unit 3 computes the voltage of the mix damper and the blower motor, ON / OFF of the complex, etc. from these information, and outputs them to the mix damper drive unit 4, the blower motor control unit 5, and the compressor drive unit 6 for comfortable operation. Achieve air conditioning. An outside air sensor 8 is input to the outside air sensor abnormality detection unit 7,
If an abnormality of the outside air sensor 8 is detected, an abnormality signal is output to the arithmetic unit 3.

FIG. 6 is a flowchart of the control of the arithmetic unit 3. First, an analog signal or a digital signal from an outside air sensor or the like is input. In step 20, the abnormality check of the outside air sensor is performed, and if there is an abnormality signal of the outside air sensor from the outside air sensor abnormality detection unit 7, the outside air temperature is set to 25 ° C. in step 21
22 shifts. In step 22, the position of the mix damper is calculated based on these pieces of information and used as position data. Step 23
Then, a signal for driving the mix damper is output to the mix damper drive unit 4 according to the position data. After that, the blower motor voltage control and the compressor control are performed.

Problems to be Solved by the Invention However, in the above-described configuration, since only the same temperature is input when the outside air sensor is abnormal, comfortable air conditioning cannot be performed at all outside air temperatures. For example, if the outside air sensor becomes abnormal when the outside air temperature is 0 ° C., 25 ° C. is input as the outside air temperature. That way, the outside air temperature is 25 ° C
At that time, the air having the required blowing temperature is supplied into the vehicle interior. Since the actual outside air temperature is 0 ° C, the heating capacity is insufficient and the vehicle interior temperature becomes very low. Even if the set temperature is raised to raise the passenger compartment temperature, the passenger compartment temperature does not rise sufficiently because the outside air temperature is input as 25 ° C.

Therefore, the present invention provides an air conditioner for a vehicle that provides a comfortable air conditioning by minimizing the effect of the abnormality of the outside air sensor.

Means for Solving the Problems In order to solve the above-mentioned problems, an automobile air conditioner of the present invention has a temperature setting device for setting a desired vehicle interior temperature, an outside air sensor for detecting an outside air temperature, and a vehicle interior temperature. The internal air sensor for detecting the external air sensor, the external air sensor abnormality detection unit for detecting an abnormality of the external air sensor, and when the abnormality of the external air sensor is detected by the external air sensor abnormality detection unit, the set temperature set by the temperature setting device is high. When the temperature is low, and when the set temperature is low, it is determined to be high from the output of the abnormal temperature outside air temperature calculation unit that calculates the abnormal temperature outside air temperature, the set temperature and the inside air sensor, and the outside air sensor abnormality detection unit. Then, when the outside air sensor is normal, the outside air temperature input from the outside air sensor is used, and when the outside air sensor is abnormal, the outside air temperature information at the time of abnormality is calculated by the outside air temperature calculation unit at the time of abnormality. In addition, a calculation unit for calculating the blowout temperature or the blown air amount into the passenger compartment and a control device for automatically controlling the mix damper and the blower motor by the output of the calculation unit are provided.

The present invention has the above-described configuration, and when the set temperature is high when the outside air sensor is abnormal, the outside air temperature is lowered, and when the set temperature is low, the outside air temperature is raised to perform the calculation, thereby minimizing the influence when the outside air sensor is abnormal. As long as possible, comfortable air conditioning can be performed.

Example Hereinafter, regarding an automobile air conditioner of one example of the present invention,
A description will be given with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an automobile air conditioner of the present invention. The same parts as those in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

1 is different from FIG. 5 in that the temperature setting device 1 is input to the abnormal-time outside air temperature calculation unit 9 and the output of the abnormal-time outside air temperature calculation unit 9 is input to the calculation unit 3a.

FIG. 2 is a front view of the temperature setting device 1. If the temperature setting lever 10 is set to the center, the set temperature will be 25 ° C. If the temperature setting lever 10 is set to the left end, the set temperature will be 17 ° C. If the temperature setting lever 10 is set to the right end, the set temperature will be 33 ° C.

FIG. 3 is a characteristic diagram of the output of the outside air temperature calculation unit 9 under abnormal conditions. If the set temperature of the temperature setting device 1 is 17 ° C. which is the minimum setting, the data of the outside air temperature of 30 ° C. is output to the calculation unit 3a. If the set temperature of the temperature setting device 1 is 33 ° C. which is the maximum setting, the data of the outside air temperature of 0 ° C. is output to the calculation unit 3a.

FIG. 4 is a flowchart of the calculation unit 3a. First, input analog and digital signals from the inside air sensor,
In step 30, the outside air sensor is checked for abnormalities. If there is an abnormality signal from the outside air sensor from the outside air sensor abnormality detection unit 7, the process proceeds to step 31, the output of the abnormal temperature outside air temperature calculation unit 9 is made the outside air temperature, and the process proceeds to step 32. If there is no abnormality in the outside air sensor, leave the input outside air temperature as it is,
Go to step 32. In step 32, the position of the mix damper is calculated based on these pieces of information to obtain position data. If the outside air temperature is low, heating capacity is required, so the mix damper moves to the HOT side in order to raise the outlet temperature. If the outside air temperature is high, the heating capacity is not required, so the mix damper moves to the COOL side in order to lower the outlet temperature. In step 33, a signal for driving the mix damper is output to the mix damper drive unit 4 according to the position data. After that, the blower motor voltage control and the compressor control are performed.

As described above, the present invention has an outside air sensor abnormality detection unit that detects an abnormality of the outside air sensor in the control device, and is low when the set temperature set by the temperature setting device is high, and is high when the set temperature is low. By providing an outside air temperature calculation unit at the time of abnormality to calculate and output the outside air temperature so that the outside air temperature calculation unit at the time of abnormality of the outside air sensor calculates the blowout temperature and the blown air volume as the outside air temperature. Even if the outside air sensor becomes abnormal when the temperature is low and the indoor temperature becomes low, if the set temperature is raised to raise the indoor temperature, the outside air temperature will be lowered, and the effect will be minimized when the outside air sensor is abnormal, Comfortable air conditioning can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an automobile air conditioner according to an embodiment of the present invention, FIG. 2 is a front view showing the same temperature setting device, and FIG. Input / output characteristic diagram of the temperature calculation unit, FIG. 4 is a flowchart of control of the calculation unit, and FIG. 5 is a block diagram showing a configuration of a conventional automobile air conditioner.
FIG. 6 is a flow chart of control of the arithmetic unit. 1 ... Temperature setting device, 2 ... Analog signal input section, 3,
3a ... Calculation unit, 4 ... Mix damper drive unit, 5 ... Blower motor control unit, 6 ... Compressor drive unit, 7 ...
Outside air sensor abnormality detection unit, 8 ... Outside air sensor, 9 ... Outside air temperature calculation unit in case of abnormality, 10 ... Temperature setting lever.

Claims (1)

[Claims] 1. A temperature setting device for setting a desired passenger compartment temperature, an outside air sensor for detecting an outside air temperature, an inside air sensor for detecting a passenger compartment temperature, and an outside air sensor abnormality detecting section for detecting an abnormality of the outside air sensor. When the abnormality of the outside air sensor is detected by the outside air sensor abnormality detection unit, the outside air temperature at the time of abnormality is low when the set temperature set by the temperature setting device is high and becomes high when the set temperature is low. By the output of the abnormal temperature outside air temperature calculation unit and the outside air sensor abnormality detection unit, when the outside air sensor is normal, the outside air temperature input from the outside air sensor, the set temperature, and the information of the inside air sensor, When the outside air sensor is abnormal, the outside air temperature at the time of abnormality calculated by the outside air temperature calculation unit at the time of abnormality, the set temperature, and the information of the inside air sensor are used to measure the temperature of the air blown into the passenger compartment or A calculator for calculating the Defuryou, automotive air conditioning apparatus including a control unit for automatically controlling the mixing damper and the blower motor by the output of the arithmetic unit.