# Patent

## Title
Setting system for an air-conditioner in a vehicle

## Abstract

A setting system for a vehicle air-conditioner is provided. The setting system allows for individual settings coupled with ergonomic functionality. The setting system comprises a control panel with a touch-sensitive display screen connected to a microcomputer-based controller having control outputs at least to a fan unit, to air distribution valves and to temperature adjusters of the air-conditioner. The display screen is adapted to display current settings and available setting options of at least (i) air flow rate, (ii) air distribution and (iii) air temperature, in the form of analog symbol representations that respond to tactile contact to vary current settings.

## Background
FIELD OF THE INVENTION
The present invention relates to a setting system for an air-conditioner in a vehicle.
BACKGROUND OF THE INVENTION
With increasing automation of complex comfort features in vehicle air-conditioners, an individual setting is becoming more and more complicated and difficult. For example, certain settings, such as an individual air volume distribution, are no longer possible at all with most air-conditioners in vehicles. They are simply replaced by standard settings such as “Normal” or “Automatic”, “Defrost”, “Top” and “Bottom”. Except for the “Normal” or “Automatic” setting, these options are of a limited value: none of them is useful for more than just a short period of time. Clearly, there is a lack of ergonomics in conventional setting systems for vehicle air-conditioners.
SUMMARY OF THE INVENTION
The invention provides a setting system for a vehicle air-conditioner that allows for individual settings coupled with ergonomic functionality. The setting system comprises a control panel with a touch-sensitive display screen connected to a microcomputer-based controller having control outputs at least to a fan unit, to air distribution valves and to temperature adjusters of the air-conditioner. The display screen is adapted to display current settings and available setting options of at least (i) air flow rate, (ii) air distribution and (iii) air temperature, in the form of analog symbol representations that respond to tactile contact to vary current settings. With the inventive setting system, a user readily understands, upon a simple glance onto the display screen, the current settings and also the available setting options. By just contacting an analog symbol representation on the display screen with a fingertip and moving within the available surface area of that symbol representation, a current setting is changed and immediately visualised.
In a preferred embodiment, the analog symbol representations each comprise a geometric figure defining a continuous surface that represents a continuous range of available setting values, and a current setting value is depicted by a visually accentuated marking within said continuous surface. Based on just a few geometric figures such as triangles and slider-bars, a user easily recognises on the display screen the current settings and the available setting options.
In an advantageous embodiment of the invention, it is assumed that the volume of air that is distributed through the usual three vents for the head, chest and foot areas always amounts to 100%. This air volume has to be divided into percentages for air flow to the head, chest and foot areas. A currently set air distribution is depicted by a “weighted focal point” in an equilateral triangle. The corners of the triangle symbolically stand for the three air spaces, head, chest and foot area. The position of the focal point within the surface area of the triangle then stands for the percentage distribution to each of these areas. When the “weighted focal point” is shifted within the triangle, this is understood by the controller as a command to modify the current air distribution setting, and appropriate control signals will be sent to corresponding air distribution valves of the air-conditioner.



BRIEF DESCRIPTION OF DRAWINGS
Further features and advantages of the invention ensue from the following description with reference to the accompanying drawings. In the drawings:
FIG. 1 is a block diagram of the inventive setting system;
FIGS. 2 to 5 show different settings appearing on a touch-sensitive display screen of the system; and
FIGS. 6, 7 and 8 show details of operating conditions for the touch-sensitive display screen.



DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
With reference to FIG. 1, a setting system for a vehicle air-conditioner is shown schematically. Integrated into the dashboard of the vehicle is a control panel 10. Control panel 10 is a touch-sensitive display screen. Control panel 10 displays symbol representations for temperature and air volume settings, as will be explained below in further detail. Control panel 10 is connected to a microcomputer-based controller 12 through a bus 14. Controller 12 has outputs for driving a fan unit 16, control outputs to left-hand and right-hand air valve units 18, 20 and control outputs to left-hand and right-hand temperature adjusters 22, 24.
With reference to FIG. 2, the symbol representations on control panel 10 include tow arrow-shaped vertical slider-bar symbols for the left-hand and right-hand temperature settings, one horizontal arrow-shaped slider-bar symbol for the total air volume and two triangles each with a dot to represent the currently set air distribution on the left-hand and right-hand sides. Each of the slider-bar symbols for the temperatures is associated with a numerical display field where the current temperature settings are displayed numerically. The slider-bar symbol for the air volume is associated with a numerical display field indicating the current setting as a percentage of total available volume. The dot in each of the triangular symbols is indicative of the current air distribution between the head, foot and chest vents. The closer the dot is to any of the tree corners in a triangle, the more air will be discharged from corresponding air vents. For example, in FIG. 2, the dot in the left-hand triangle is centered, indicating a balanced air distribution (33% head, 33% foot, 33% chest), and the dot in the right-hand triangle indicates a 100% setting for the chest vents. Other examples are readily apparent from FIGS. 3-5.
To change any of the current settings, the corresponding symbol on control panel 10 is touched with a fingertip. The symbol is highlighted to indicate it is active for adjustment. For example, in FIG. 6, the left-hand slider-bar ist touched and the bar is “moved” upwards to increase the temperature value. In FIG. 7, the dot in the left-hand triangle is touched and “moved” to the left to increase the proportion of air volume from the chest vents. In FIG. 8, the horizontal slider-bar is touched and the bar “moved” to the right to increase the total air volume supplied to all vents. In all cases, completion of an adjustment may be signalled by a “double-click”, or by just removing the fingertip from control panel 10. The settings in each of the symbols on control panel 10 are interpreted by controller 12 and converted into appropriate control signals for the fan unit 16, the left-hand and right-hand air valve units 18, 20 and the left-hand and right-hand temperature adjusters 22, 24.

## Claims

1. A setting system for an air-conditioner in a vehicle, comprising a control panel with a touch-sensitive display screen connected to a microcomputer-based controller having control outputs at least to a fan unit, to air distribution valves and to temperature adjusters of the air-conditioner, wherein said display screen is adapted to display current settings and available setting options of at least
air flow rate, 
air distribution and 
air temperature 
in the form of analog symbol representations that respond to tactile contact to vary current settings.

2. The setting system according to claim 1, wherein the analog symbol representations each comprise a geometric figure defining a continuous surface that represents a continuous range of available setting values, and a current setting value is depicted by a visually accentuated marking within said continuous surface.

3. The setting system according to claim 2, wherein a current setting of air distribution is represented by a dot within the surface area of a triangle.

4. The setting system according to claim 2, wherein the analog symbol representation comprises a slider-bar.

5. The setting system according to claim 4, wherein the slider-bar is generally arrow-shaped.

6. The setting system of claim 4, wherein the slider-bar is associated with a digital display field that displays a numerical value of a current setting.

7. The setting system according to claim 4, wherein a temperature setting is represented by the slider-bar.

8. The setting system according to claim 4, wherein an air flow rate setting is represented by the slider-bar.