Abstract:
A human-machine interface device for controlling a plurality of vehicle functions. The interface has a knob which is bidirectionally rotatable at a rest level and a pressed level. A selected one of the vehicle functions is selected by the knob at the rest level, and the selected one of the vehicle functions is controlled by the knob at the pressed level.

Description:
FIELD OF INVENTION 
     The present invention relates generally to human-machine interfaces, and more particularly to such interfaces having a rotatable knob which is linearly translatable along the axis of rotation. 
     BACKGROUND 
     Modern vehicles contain a number of systems which require input from the driver or its occupants. Examples of such systems include climate control, navigation, audio entertainment, video entertainment, and body control. As the number of systems increase and the functionality of each system increases, there is also an increasing demand for users of the systems to provide input. For example, climate control systems have evolved from needing a user to set a desired temperature for the entire passenger compartment to needing input for a desired temperature in each zone of the vehicle, such as the driver&#39;s area, front passenger&#39;s area, and the remaining area of the vehicle extending from behind the first seating row. 
     Using a conventional interface method of dedicated buttons and other control devices to provide input to each system requires that an undesirably large percentage of the vehicles interior surface be covered with these devices. Also, the large number of devices may become undesirably expensive to produce and challenging to assemble quickly and accurately. 
     SUMMARY OF INVENTION 
     Accordingly, one aspect of the present invention is to provide a human-machine interface which is desirable for providing input to vehicle system. 
     Another aspect of the present invention is to provide a human-machine interface which may be economical to produce and assemble into a vehicle. 
     In accordance with these aspects, a human-machine interface device is provided for controlling a plurality of vehicle functions. The interface has a knob which is bidirectionally rotatable at a rest level and a pressed level. A selected one of the vehicle functions is selected by the knob at the rest level, and the selected one of the vehicle functions is controlled by the knob at the pressed level. 
     Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood however that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  illustrates a side view of a human-machine input device, and 
         FIG. 2  illustrates a front view of a human-machine input device. 
     
    
    
     DETAILED DESCRIPTION 
     The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application or uses. 
     Turning to  FIG. 1 , a multifunction interface  1  is shown in side view. A housing  10  contains an electronics assembly  34 . A knob  12  is connected to the electronics assembly  32  by a shaft  14 . The knob  12  is rotatable about the axis of shaft  14  and is also linearly translatable along the axis of shaft  14  to first and second positions as indicated by bidirectional arrow  20 . A connection  22  provides for communication between circuitry  32  and the system connected to interface  1 . Additionally, an indicator  16 , such as a lamp or LED, may be connected to the circuitry  32  via connection  34 . One or more buttons  24  may be located within the face of knob  12 . A button  24  may include a button mounted indicator  18 , such as a lamp or LED, which is connected to circuitry  32  via connection  36 . 
     Turning now to  FIG. 2 , a multifunction interface  1  is shown in front view. Knob  12  may be rotated clockwise and counterclockwise as indicated by bidirectional rotation arrow  38 . Knob  12  may also be pressed, thereby translating it towards the housing  10 . Knob  12  may also be rotated while it is pressed. Function annunciators  26   a - e  may be positioned on the housing  10 , as may be a display  28 . The display  28  may provide information regarding the vehicle system receiving input from the interface  1  by displaying a function label  30  and a function representation  40 . 
     Operation of interface  1  will now be explained by non-limiting example. While interface  1  may be used to control one or more vehicle systems, climate control will be used in this example. Examples of systems include audio entertainment, video entertainment, and navigation. 
     Knob  12  rotates about an axis. Knob  12  may also be pressed from a rest level to a pressed level, where it is also rotatable. When pressed, knob  12  translates linearly down the axis of rotation from the rest level to the pressed level. When released, a bias element, such as a spring coaxial with shaft  14 , urges knob  12  from the pressed level back to the rest level. Rotating knob  12  at the rest level selects the function that will be controlled. In climate control, these functions may include defrost, blower speed, floor/vent mode, temperature, and automatic mode. Detents may be associated with each function such knob  12  may be rotated at the rest level and the detents may be sensed by a user to determine when the next function has been selected. Once the desired function is selected, knob  12  is depressed to the pressed level and then rotated to control the desired function. For example, if the temperature function was selected with knob  12  at the rest level, then the temperature may be adjusted by rotating knob  12  while it is depressed to the pressed position. The new desired temperature may then be accepted immediately by the climate control system, or the system may wait until knob  12  is released before accepting the new desired temperature. 
     If used, each function annunciator  26   a - 26   e  may be associated with a system function, i.e. defrost, blower speed, floor/vent mode, temperature, and automatic mode, respectively. As knob  12  is rotated at the rest level, each annunciator illuminates exclusive of the others to indicate which function is selected for control. For some functions, such as defrost, it is desirable to provide an indicator  16  to inform the user whether the selected function is on or off regardless of whether knob  12  is being rotated or pressed. 
     One or more buttons  24  may be located within the face of knob  12 . A button  24  may be used to control a function which has an on/off operation, such as a rear window defroster and an air conditioning request. A button mounted indicator  18 , such as a lamp or LED, may be used to indicate whether the function associated with a button  18  is turned on. 
     A display  28  may also be provided for indicating which function is selected by knob  12  at its rest level. The display may provide a function label  30  to indicate the selected function. A function representation  40  may also be shown on the display to reflect adjustments made to the selected function while knob  12  is pressed and rotated.