AUTOMOTIVE TOUCHSCREEN CONTROLS WITH SIMULATED TEXTURE FOR HAPTIC FEEDBACK

• US 20150309573A1
• Filed: 04/28/2014
• Published: 10/29/2015
• Est. Priority Date: 04/28/2014
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Van Wiemeersch, John R., Brombach, Ronald P., Hazebrouck, Laura V., Hanson, Ryan E.
• Granted Patent: US 9,829,979 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60K 2360/1442 Emulation of input devices
• CPC Class Codes: B60K 2370/1442 Emulation of input devices
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/10 Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: B60K 37/06 of controls, e.g. controls knobs
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04817 using icons graphical or visual programming using iconic symbols G06F8/34
• CPC Class Codes: G06F 3/0482 Interaction with lists of selectable items, e.g. menus
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence
• CPC Class Codes: G06F 3/04847 Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

A vehicle control system uses a touchscreen display to displaying a graphical HMI and detect a contact point where touched by a user'"'"'s finger. A haptic texture system has an electrode disposed across the touchscreen display and a signal generator generating an oscillating signal to produce a potential difference between the finger and the electrode resulting in a corresponding perceived texture as the finger slides over the touchscreen. A control circuit is configured to set at least a frequency or amplitude of the oscillating signal to vary the perceived texture according to first and second modes while navigating the graphical HMI. The first mode uses a localized texture mapping defined by respective feature icon selection regions on the touchscreen display. The second mode uses a status texture mapping relating the perceived texture to each potential adjustment setting available for a feature icon that has been selected using the first mode.

Claims

1. A vehicle control system comprising:

a touchscreen display for displaying a graphical HMI and detecting a contact point on the display established manually by touching by a finger of a user;

a haptic texture system having an electrode disposed across the touchscreen display and a signal generator generating an oscillating signal to produce a potential difference between the finger and the electrode resulting in a corresponding perceived texture as the finger slides over the touchscreen display; and

a control circuit that is configured to set at least a frequency or amplitude of the oscillating signal to vary the perceived texture according to first and second modes while navigating the graphical HMI, wherein the first mode uses a localized texture mapping defined by respective feature icon selection regions on the touchscreen display, and wherein the second mode uses a status texture mapping relating the perceived texture to each potential adjustment setting available for a feature icon that has been selected using the first mode.

2. The system of claim 1 wherein the status texture mapping relates an intensity of the perceived texture to an intensity of the adjustment setting.

3. The system of claim 2 wherein the control circuit varies the intensity of the perceived texture by varying the amplitude of the oscillating signal.

4. The system of claim 2 wherein the control circuit varies the intensity of the perceived texture by varying a wave shape of the oscillating signal.

5. The system of claim 2 wherein the status texture mapping is localized to an adjustment slider image in the graphical HMI.

6. The system of claim 1 wherein the potential adjustment setting are comprised of a respective on setting and a respective off setting for the feature icon, and wherein the status texture mapping relates two distinct textures to the on and off settings.

7. The system of claim 1 wherein the localized texture mapping in the first mode provides no texture at respective positions between respective feature icons and a maximum texture coincident with the respective feature icons.

8. The system of claim 1 wherein the control circuit varies the oscillating signal to provide a ramping texture approaching each feature icon.

9. The system of claim 1 wherein the touchscreen display detects contact points for first and second fingers, wherein the control circuit switches from the first mode to the second mode after the first finger becomes engaged with a selected feature icon, remains in the second mode responsive to the second finger while the first finger remains engaged with the selected feature icon, and then switches back to the first mode when the first finger is no longer engaged with the selected feature icon.

10. The system of claim 1 wherein the control circuit switches from the first mode to the second mode in response to a manual selection of a selected feature icon and remains in the second mode until a predetermined event.

11. The system of claim 10 wherein the predetermined event is comprised of a manual selection of a corresponding command icon in the graphical HMI.

12. The system of claim 10 wherein the predetermined event is comprised of a predetermined elapsed time.

13. The system of claim 1 further comprising a user grounding path to provide a common ground for the user and the signal generator, wherein the user grounding path is capacitively coupled to the user.

14. The system of claim 13 wherein the user grounding path is comprised of a conductive element incorporated in a seat belt.

15. The system of claim 13 wherein the user grounding path is comprised of a conductive element incorporated in a seat surface.

16. The system of claim 13 further comprising:

a ground coupling estimator measuring a vehicle state correlated with an expected capacitive coupling between the user and the user grounding path;

wherein the signal generator includes a gain control that is adjusted in response to the measured vehicle state.

17. The system of claim 1 wherein the electrode has a plurality of zones coupled to a plurality of signal generators.

18. A vehicle HMI comprising:

a touchscreen display;

a texture system having an electrode on the display receiving an oscillating signal from a signal generator creating perceived textures to a sliding finger; and

a control circuit driving the signal generator varying perceived textures with a localized texture mapping for selecting feature icons on the display and with a status texture mapping relating perceived texture to potential adjustment settings according to the feature icon then selected.

19. A method for operator control of controllable features within an automotive vehicle, comprising the steps of:

monitoring finger contact on a touchscreen display to navigate a graphical HMI with respective elements on the display including feature selection icons and adjustment icons; and

driving a signal generator of a haptic texture system with an oscillating signal to produce a potential difference between the finger and an electrode resulting in a corresponding perceived texture as the finger slides over the touchscreen display, wherein an amplitude or frequency of the oscillating signal is varied in response to a contact point of the finger on the touchscreen display;

wherein the driving step includes a first mode having a localized texture mapping defined by respective feature icon selection regions on the touchscreen display; and

wherein the driving step includes a second mode having a status texture mapping relating the perceived texture to each potential adjustment setting available for a feature icon that has been selected using the first mode.

20. The method of claim 19 wherein the touchscreen display detects contact points for first and second fingers, wherein a switch is made from the first mode to the second mode after the first finger becomes engaged with a selected feature icon so that the second finger changes an adjustment setting in the second mode, and wherein a switch is made back to the first mode when the first finger is no longer engaged with the selected feature icon.