Touch sensor having a selectable sensitivity level and method of selecting a sensitivity level of a touch sensor

• US 8,736,432 B2
• Filed: 06/07/2011
• Issued: 05/27/2014
• Est. Priority Date: 06/07/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Sitarski, Nicholas Scott
• Primary Examiner(s): Lau, Hoi
• Application Number:
  US13/154,561
• Publication Number:
  US 20120313767A1
• Time in Patent Office: 1,085 Days
• Field of Search: 340/425.5, 340/407, 340/439, 340/461, 340/438, 324/684, 324/685, 345/178, 345/174, 345/173, 345/162, 345/184, 701/36, 701/33, 701/213
• US Class Current: 340/425.5
• CPC Class Codes: B60K 2360/1438 Touch screens
• CPC Class Codes: B60K 2360/1442 Emulation of input devices
• CPC Class Codes: B60K 2360/1446 Touch switches
• 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: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2217/94026 Automatic threshold calibration; e.g. threshold automatically adapts to ambient conditions or follows variation of input

Abstract

A touch sensor assembly having a selectable sensitivity level allows for a user to activate a touch sensor while wearing hand covers. The touch sensor assembly includes a touch sensor, a comparison unit, and a control unit. The touch sensor has a selectable sensitivity level, and detects a value corresponding to a capacitance of the touch sensor. The comparison unit has a predetermined threshold stored therein, and determines activation of the touch sensor if the detected value exceeds the predetermined value. The control unit is operable to select a sensitivity level of the touch sensor by varying the predetermined threshold by an amount unrelated to an environmental effect on the touch sensor.

Claims

1. A touch sensor assembly having selectable sensitivity levels to allow a user to operate said touch sensor assembly while wearing hand covers, said touch sensor assembly comprising:

a touch sensor having a selectable sensitivity level, said touch sensor detects a value corresponding to a capacitance of said touch sensor;

a comparison unit having a predetermined threshold stored therein, said comparison unit determines activation of said touch sensor when said detected value exceeds said predetermined threshold; and

a control unit operable to select said sensitivity level of said touch sensor by varying said predetermined threshold by an amount unrelated to an environmental effect on said touch sensor.

2. The touch sensor assembly of claim 1, wherein said control unit selects said sensitivity level of said touch sensor by decreasing said predetermined threshold by a predetermined amount that is unrelated to said environmental effect on said touch sensor.

3. The touch sensor assembly of claim 2, wherein said environmental effect includes the change in said detected value due to temperature or humidity.

4. The touch sensor assembly of claim 3, wherein said control unit selects said sensitivity level upon receipt of a signal from a determination unit that determines the satisfaction of a condition.

5. The touch sensor assembly of claim 4, wherein said condition is whether a user is wearing hand covers, and said determination unit determines satisfaction of said condition if said user is wearing hand covers.

6. The touch sensor assembly of claim 4, wherein determination unit includes a temperature sensor and a predetermined temperature value, said temperature sensor detects a temperature and said determination unit compares said detected temperature with said predetermined temperature value, and wherein said determination unit determines the satisfaction of said condition if said predetermined temperature value exceeds said detected temperature.

7. The touch sensor assembly of claim 4, wherein said determination unit includes an input device actuated by the user.

8. The touch sensor assembly of claim 7, wherein said input device is a voice recognition unit.

9. The touch sensor assembly of claim 4, wherein said determination unit includes an optical sensor that captures an image and compares said captured image to a stored image to determined whether the user is wearing hand covers, and wherein said determination unit determines the satisfaction of said condition if the user is wearing hand covers.

10. The touch sensor assembly of claim 7, wherein said comparison unit includes a plurality of predetermined thresholds and wherein said input device operable to select one of said plurality of predetermined thresholds to be compared to said detected value.

11. A touch sensor assembly having selectable sensitivity levels to allow a user to operate said touch sensor assembly while wearing hand covers, said touch sensor assembly comprising:

a touch sensor having a selectable sensitivity level, said touch sensor detects a value corresponding to a capacitance of said touch sensor;

a comparison unit that determines activation of said touch sensor if said detected value exceeds a predetermined threshold, said comparison unit operable in a first mode in which said detected value is compared to a first predetermined threshold and a second mode in which said detected value is compared to a second predetermined threshold;

a temperature sensor; and

a control unit connected to said temperature sensor to receive a detected temperature, said control unit operable to select said sensitivity level of said touch sensor by comparing said detected temperature to a predetermined temperature and executing said first mode if said predetermined temperature is below said detected temperature and executing said second mode if said predetermined temperature exceeds said detected temperature.

12. The touch sensor assembly of claim 11, wherein said first predetermined threshold is greater than said second predetermined threshold.

13. The touch sensor assembly of claim 11, wherein said touch sensor is disposed in an automotive vehicle, and wherein said temperature sensor measures a temperature of an interior passenger compartment of said automotive vehicle.

14. The touch sensor assembly of claim 11, wherein said touch sensor is disposed in an automotive vehicle, and wherein said temperature sensor measures a temperature of an exterior environment of said automotive vehicle.

19. The touch sensor assembly of claim 11, wherein a difference between said first predetermined threshold and said second predetermined threshold is an amount unrelated to an environmental effect on detecting said value corresponding to said capacitance of said touch sensor by said detected temperature.

20. The touch sensor assembly of claim 19, wherein said first predetermined threshold is greater than said second predetermined threshold.

15. A method for selecting a sensitivity level of a touch sensor, said method comprising the steps:

detecting a value corresponding to a capacitance of the touch sensor;

determining activation of the touch sensor when said detected value corresponding to capacitance of the touch sensor exceeds a predetermined threshold;

detecting a temperature of an environment of the touch sensor;

comparing said detected temperature to a predetermined temperature to switch the touch sensor between a first mode in which said detected value is compared to a first predetermined threshold and a second mode in which said detected value is compared to a second predetermined threshold; and

adjusting the touch sensor to said first mode when said predetermined temperature is below said detected temperature and adjusting the touch sensor to said second mode when said predetermined temperature exceeds said detected temperature;

wherein a difference between said first predetermined threshold and said second predetermined threshold is an amount unrelated to an environmental effect on detecting said value corresponding to said capacitance of the touch sensor by said detected temperature.

16. The method of claim 15, wherein said environmental effect includes the change in said detected value due to temperature or humidity.

17. The method of claim 15, wherein said touch sensor is disposed within an automotive vehicle.

18. The method of claim 15, wherein said first predetermined threshold is greater than said second predetermined threshold.