JP2506430Y2 - Automotive air conditioners - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides an air conditioner for an automobile that gives fluctuations (irregular or regular pulsating change) under certain conditions to the air volume supplied to the passenger compartment. Regarding the device.

[Prior Art] As a vehicle air conditioner of this type, Japanese Patent Publication No. 63-138
The one described in Japanese Patent Publication No. 45 is known. This device is designed to perform fluctuation blowing when the room temperature does not change and the control state becomes stable.

[Problems to be solved by the invention] By the way, generally, as the temperature change in the vehicle interior disappears and the control state stabilizes, air volume control is performed so that the air volume becomes small and becomes a constant value. On a hot day or the like, even if cooling is performed with full cooling, the airflow rate does not become low due to the limit of the cooling capacity, the temperature change in the vehicle interior may disappear, and the control may be stable.

However, even when the air volume is not necessarily low, the device described in the above-mentioned prior art determines that the control state is stable because the temperature change has disappeared, and thus fluctuates the air flow. Therefore, in such cases,
Fluctuation blowing with a large amount of air flow may rather cause an occupant discomfort. Fluctuation blowing with a small air volume also causes noise and makes the occupants harsh.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the vehicle air conditioner according to the present invention has a gist of the invention according to claim 1 in which temperature-controlled air is blown into the vehicle interior. In an air conditioner for an automobile that automatically controls the temperature, a target air flow rate calculating means for calculating a target air flow rate, a LOW air flow rate determining means for determining whether or not the air flow rate blown into a vehicle compartment is below a predetermined low air flow rate, and this LOW air flow rate. A time measuring means for measuring the elapsed time after the judgment means judges that the blown air volume is less than a predetermined low air quantity, and the blown air volume into the vehicle compartment is set to a target air flow rate calculated by the target air flow rate calculation means. Control means for controlling the blower, and controlling the blower so as to give fluctuation to the amount of air blown into the vehicle when the elapsed time measured by the timing means reaches a predetermined time. It is in an air conditioner for automobiles.

[Operation] In the device of the present invention, the target air flow rate is calculated, and the blower air flow rate of the blower is controlled so as to reach this target air flow rate. Then, when the blown air volume is less than or equal to a predetermined air volume, the LOW air volume determination means outputs a signal, the time counting means measures the elapsed time from the signal output, and when this elapsed time reaches the predetermined time, the air is blown into the vehicle interior. Gives fluctuation to the air volume. The case where the LOW air volume determination means determines that the air volume is less than or equal to the predetermined air volume indicates the state where the unpleasant air-conditioning environment has just reached the set environment. Immediately after reaching this setting environment, the most comfortable air conditioning feeling continues from the feeling of achievement.
While this feeling of air conditioning continues, the blown air volume is only controlled so as to reach the target blown air volume, and the blown air volume does not fluctuate. Therefore, a comfortable air-conditioning feeling is not impaired by this fluctuating air flow. When this feeling of air conditioning begins to saturate due to habituation, that is, when the elapsed time reaches a predetermined time, fluctuations are given to the air flow rate, so saturation of the feeling of air conditioning is prevented, and a comfortable feeling of air conditioning is provided. You can continue further.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a main functional block diagram of a control unit of the air conditioner shown as the first embodiment, and FIG. 2 is a schematic diagram showing the overall configuration of the same embodiment device.

First, the outline of the overall configuration of the air conditioner will be described with reference to FIG. In FIG. 2, reference numeral 10 is a ventilation duct, and an inside air intake 12 and an outside air intake 13 that are switched by an intake door 11 are provided at the upstream end of this ventilation duct 10, and at the downstream end, A VENT outlet 15, a DEF outlet 16, and a FOOT outlet 17, which are switched by an outlet door 14, are provided.

In addition, a blower 18, an evaporator 19, an air mix door 20, and a heater 21 are sequentially provided in the middle of the ventilation duct 10 from the upstream side to the downstream side. And
By controlling the opening of the air mix door 20, the mixing ratio of cold air and warm air is adjusted to adjust the temperature of the air blown into the vehicle. Reference numeral 22 is an intake door actuator, 23 is a compressor that constitutes a cooling system together with an evaporator, 24 is an air mix door actuator, 25 is a heater water valve, and 26 is a mode door actuator.

The actuators are controlled by the control unit 30. The control unit 30 is mainly composed of a microcomputer, and calculates a target outlet temperature based on at least input information from the inside air sensor 31, the outside air sensor 32, and the temperature setter 33. Then, the target position of the air mix door 20 and the target air flow rate of the blower 18 are calculated based on the calculated values, and the air mix door 20 and the blower 18 are controlled based on the calculated values. Similarly, the intake door 11, the evaporator 19, the heater 21
Also control.

In addition, the control unit 30 determines from the above-mentioned target outlet temperature that the air flow rate is equal to or less than a predetermined low air volume (minimum air volume or a breeze close to the minimum air volume), and after a predetermined time elapses from this determination, the blower 18 is rotated. It has a function to give fluctuations to.

This point will be described with reference to the functional block diagram of FIG. The control unit 30 includes, as function realizing means, virtually target blowout temperature calculating means 51, target mixdoor position calculating means 52, target air flow rate calculating means 53, mixdoor control means 54, blower control means 55, LOW airflow rate determining means. Five
6, time measuring means 67, fluctuation signal generating means 57, selecting means 58,
Is equipped with.

The target outlet temperature calculating means 51 calculates the target outlet temperature based on the input signals from the room temperature detecting means 61 (inside air sensor 31) and the temperature setting means 62 (temperature setter 33). The target mix door position calculation means 52 calculates the target mix door position based on the target outlet temperature, and supplies a position signal to the mix door control means 54. Then, the mix door control means 54
Outputs a drive signal to the mix door actuator 24 according to the position signal to move the air mix door 20 to the target position.

Further, the target air flow rate calculation means 53 calculates the target air flow rate based on the target blowout temperature and outputs a normal air flow signal. On the other hand, the fluctuation signal generating means 57 outputs a fluctuation blowing signal for pulsating the rotation speed of the blower 18 regularly or irregularly as a digital signal.

One of the normal blow signal and the fluctuation blow signal is selected by the selection means 58, the selected signal is supplied to the blower control means 55, and the blower control means 55 outputs a blower drive voltage according to the input signal, Controls the rotation of the blower 18. That is, when the normal blow signal is selected,
The blower 18 constantly rotates under a constant voltage and sends out a constant air flow. When the fluctuation blowing signal is selected, the blower 18 makes a pulsating rotation under a fluctuating voltage and sends out an air flow with a change in air volume such as natural wind.

The selection processing of the selection means 58 is performed by the LOW air volume determination means 56.
And based on the result of the timing means 67. The LOW air flow rate determination means 56 determines whether or not the blown air flow rate is below a predetermined low air flow rate (LOW air flow rate) based on whether or not the target blown air temperature is within a predetermined range, and if it is below the predetermined low air flow rate, a LOW air flow rate determination signal. Is output to the timing means 67. The time measuring means 67 measures the elapsed time after the LOW air volume determination signal is output, and after the measured elapsed time reaches a predetermined time, the selecting means 58 selects the fluctuation air blowing signal and controls the blower signal. Input to the means 55. If the LOW air volume determination signal is not output,
The selection means 58 selects a normal air blowing signal and inputs the same signal to the blower control means 55. The fluctuation signal generating means 57
The selection means 58 and the blower control means 55 correspond to the control means in the first aspect of the invention.

Therefore, the target air flow rate is calculated, and the blower air flow rate of the blower is controlled so as to reach this target air flow rate. And
Fluctuation is given to the blown-out airflow only when the airflow is below a predetermined low airflow and the elapsed time after the airflow falls below the predetermined airflow reaches a predetermined time. The case where the air volume is determined to be equal to or less than the predetermined air volume indicates a state where the unpleasant air-conditioning environment has just reached the set environment. Immediately after reaching this setting environment, the most comfortable air conditioning feeling continues from the feeling of achievement.
While this feeling of air conditioning continues, the blown air volume is only controlled so as to reach the target blown air volume, and the blown air volume does not fluctuate. Therefore, a comfortable air-conditioning feeling is not impaired by this fluctuating air flow. When this feeling of air conditioning begins to saturate due to habituation, that is, when the elapsed time reaches a predetermined time, fluctuations are given to the air flow rate, so saturation of the feeling of air conditioning is prevented, and a comfortable feeling of air conditioning is provided. You can continue further.

[Advantages of the Invention] As described below, according to the vehicle air conditioner of the present invention, the target air flow rate is calculated, and the blower air flow rate of the blower is controlled so as to be the target air flow rate. The fluctuation is given to the blown air volume only when the elapsed time after reaching the predetermined air volume reaches the predetermined time at a predetermined air volume or less. In this way, since the fluctuating air is postponed for a predetermined time, the comfortable air conditioning feeling that continues immediately after reaching the set environment from the unpleasant air conditioning environment is not impaired by the fluctuating air blowing. When the feeling of air conditioning begins to saturate due to habituation, fluctuation airflow is performed, so saturation of the feeling of air conditioning can be prevented, and a comfortable feeling of air conditioning can be further continued.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the main configuration of the control unit of the first embodiment of the present invention, and FIG. 2 is a schematic diagram showing the overall configuration of the air conditioner of the same embodiment. 56: LOW air volume setting means, 57: Fluctuation signal generating means, 5
8 …… Selection means, 55 …… Blower control means, 67 …… Timekeeping means

Claims (1)

(57) [Scope of utility model registration request] 1. An air conditioner for a vehicle for automatically controlling the temperature inside a vehicle by blowing temperature-controlled air into the vehicle interior, wherein a target air flow rate calculation means for calculating a target air flow rate and an amount of air blown into the vehicle interior are LO for determining whether the air volume is below a specified low air volume
The W air volume determination means, the time measurement means for measuring the elapsed time after determining that the blown air volume is less than or equal to the predetermined low air volume by the LOW air volume determination means, and the blown air volume into the vehicle interior by the target air volume calculation means. A control means for controlling the blower so as to obtain a calculated target air flow rate, and for controlling the blower so as to give fluctuations to the blown air volume into the vehicle compartment when the elapsed time measured by the timekeeping means reaches a predetermined time. An air conditioner for an automobile, comprising: