Patent Application
20140348332
This disclosure generally relates to acoustic based control input, and more particularly relates to a trip reset button for a vehicle instrument cluster.
Some vehicle instrument clusters convey information entirely by way of a liquid crystal displays (LCD). The LCD covers the entire viewing area of an instrument cluster pocket of a dashboard assembly. Adding a conventionally located trip/reset button has been a challenge in such instrument clusters. LCD manufactures either do not offer LCD panels with small holes in them for passing through a stem of the conventionally located trip/reset button, or charge a very high cost due to high fallout rates in the LCD production process. As a work-around, auto makers resort to adding the trip/reset button function to other areas of the vehicle, on the steering wheel for example, which is undesirable costly, and so locates the trip/reset button in a place not conventionally expected by the automobile customer.
In accordance with one embodiment, an instrument panel for a vehicle is provided. The instrument panel includes a housing, a microphone, and an actuator. The microphone is configured to detect a characteristic sound in the housing. The actuator is coupled to the housing. The actuator is also configured to emit the characteristic sound into the housing when actuated.
Further features and advantages will appear more clearly on a reading of the following detailed description of the preferred embodiment, which is given by way of non-limiting example only and with reference to the accompanying drawings.
The present invention will now be described, by way of example with reference to the accompanying drawings, in which:
The instrument panel 12 generally includes a housing 20 that may include features to aid attaching the instrument panel 12 to the dashboard 16 of the vehicle 10, as will be recognized by those skilled in the art. The instrument panel 12 also includes an actuator 22 shown at a location typically associated with a trip/reset button of the instrument panel 12. As will become apparent in the description that follows, the actuator 22 is distinct from prior art examples of a trip/reset button in that it does not include a shaft extending through the display 18, as is the common practice for many known instrument panels. Furthermore, the actuator 22 does not rely on wires or other means of conducting an electrical signal from the actuator 22 to indicate to other circuitry in the instrument panel 12 that the actuator 22 is being actuated. Indeed, as will become apparent, the actuator 22 appears to hover over the display 18 without any obvious means for the actuation of the actuator 22 to communicate with other circuitry in the instrument panel 12.
To achieve this effect, the actuator 22 is generally configured to emit a characteristic sound 24 (
Other ways for an actuator to be formed on the surface of lens portion 28 are contemplated, and so the examples set forth herein are not limiting. For example, an actuator may be provided by molding a dome feature into the lens portion, where the dome feature is configured to deflect in a manner similar to the snap dome 32 when pressed by the operator 14. Furthermore, instead of pressing the stem 36, the actuator may be configured to emit the characteristic noise when the stem 36 or a knob in place of the stem 36 is rotated.
In the non-limiting example given above, the actuator 22 is generally designated to be a trip-meter reset button of the instrument panel 12. However, it is also contemplated that the teachings set forth herein regarding actuators could be applied to devices other than the instrument panel 12. For example, the actuator could be used as an ON/OFF button on a radio or other entertainment device in the vehicle 10 or other device not found in the vehicle 10. Furthermore, while only one actuator is suggested, it is contemplated that the instrument panel 12 or other device could be equipped with multiple actuators. Each actuator could be configured to emit a distinct characteristic sound. Alternatively, the instrument panel could equipped with multiple microphones, and time-of-flight measurements of signals from the multiple microphones could be used to determine which of a plurality of actuators was being actuated.
It is also recognized that when the snap dome 32 is pressed and released, the sound emitted may be distinct. As such, the actuator 22 may be configured to emit a first sound when the actuator is pressed, and emit a second sound distinct from the first sound when the actuator is released. It follows that the microphone 26, or a controller (not shown) receiving a signal from the microphone 26 may be configured to determine if the detected sound corresponds to pressing or releasing the actuator 22. Such a configuration would allow for press and hold operation of the actuator 22, and so provide more modes of operation for the actuator than simply acting as a trip/reset button. Alternatively, the pressing and releasing of the actuator may be determined by a polarity difference of the signal coming from the microphone.
The controller may include a processor such as a microprocessor or other control circuitry as should be evident to those in the art. The controller may include memory, including non-volatile memory, such as electrically erasable programmable read-only memory (EEPROM) for storing one or more routines, thresholds and captured data. The one or more routines may be executed by the processor to perform steps for determining if signals received by the controller correspond to the characteristic sound 24 as described herein. The circuit board 30 may also include additional circuitry to filter a signal from the microphone 26 in order to better detect the characteristic sound 24.
Accordingly, an actuator 22 for an instrument panel 12 of a vehicle 10 is provided. Because the actuator 22 communicates actuation with sound waves (the characteristic sound 24), there is no need for unsightly wires to be connected to the actuator 22, and the actuator 22 does not need to physically extend to or through the display 18. As such, the instrument panel 12 is more aesthetically pleasing, and provides some mastery as to how actuation of the actuator 22 is communicated to the instrument panel 12.
While this invention has been described in terms of the preferred embodiments thereof, it is not intended to be so limited, but rather only to the extent set forth in the claims that follow.
