Method and apparatus for determining pressure reference value, and chip and electronic device

Patent metadata

Field	Value
Publication number	US-12026318-B2
Application number	US-202117495501-A
Country	US
Kind code	B2
Filing date	Oct 6, 2021
Priority date	Feb 5, 2021
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

Embodiments of the present disclosure provide a method and apparatus for determining a pressure reference value, and a chip and an electronic device. The method includes: consecutively acquiring N pressure signals by a pressure sensor; acquiring consecutive N pressure values on the basis of the N pressure signals; and determining a latest pressure reference value on the basis of the consecutive N pressure values and time characteristics of the consecutively acquired N pressure signals; wherein each of the pressure values is a difference between a sampling value corresponding to a pressure signal and the pressure reference value, and the consecutively acquired N pressure signals are acquired within a duration where a pressure is applied to the pressure sensor once, N being a positive integer greater than 0.

First claim

What is claimed is:

1. A method for determining a pressure reference value, comprising:
consecutively acquiring N pressure signals by a pressure sensor;
acquiring consecutive N pressure values on the basis of the N pressure signals; and
determining a latest pressure reference value on the basis of the consecutive N pressure values and time characteristics of the consecutively acquired N pressure signals for replacing a current pressure reference value;
wherein each of the pressure values is a difference between a sampling value corresponding to a pressure signal and the current pressure reference value, and the consecutively acquired N pressure signals are acquired within a duration in which a pressure is applied to the pressure sensor once, N being a positive integer greater than 0,
wherein determining the latest pressure reference value on the basis of the consecutive N pressure values and the time characteristics of the consecutively acquired N pressure signals for replacing the current pressure reference value comprises:
identifying a magnitude relationship between an i-th pressure value and a first pressure threshold and/or a second pressure threshold, wherein the first pressure threshold is used to indicate whether the pressure sensor is subjected to a positive pressure from outside to inside, and the second pressure threshold is used to indicate whether the pressure sensor is subjected to a negative pressure from inside to outside; and
updating a positive pressure time T 1 i according to T 1 i =T 1 i−1 +predetermined time length in response to the i-th pressure value being greater than the first pressure threshold, wherein the positive pressure time T 1 i is used to indicate a duration in which the pressure signal is at a positive pressure; and determining a sampling value corresponding to the i-th pressure value as the latest pressure reference value in response to the positive pressure time T 1 i being greater than a first time threshold for replacing the current pressure reference value, or
updating a negative pressure time T 2 i according to T 2 i =T 2 i−1 +predetermined time length in response to the i-th pressure value being less than the second pressure threshold, wherein the negative pressure time T 2 i is used to indicate a duration in which the pressure signal is at a negative pressure; and determining a sampling value corresponding to the i-th pressure value as the latest pressure reference value in response to the negative pressure time T 2 i being greater than a second time threshold for replacing the current pressure reference value;
wherein i is a positive integer greater than 0 and less than or equal to N.

2. The method according to claim 1 , further comprising:
determining the current pressure reference value as the latest pressure reference value in response to the positive pressure time T 1 i being less than or equal to the first time threshold; or
determining the current pressure reference value as the latest pressure reference value in response to the negative pressure time T 2 i being less than or equal to the second time threshold.

3. The method according to claim 1 , further comprising:
updating a no-pressure time T 3 i according to T 3 i =T 3 i−1 +predetermined time length in response to the i-th pressure value being greater than or equal to the second pressure threshold and less than or equal to the first pressure threshold, wherein the no-pressure time T 3 i is used to indicate a duration in which the pressure sensor is subjected to no pressure; and
determining the latest pressure reference value according to a filter function in response to the no-pressure time T 3 i being greater than a third time threshold for replacing the current pressure reference value, or
determining the current pressure reference value as the latest pressure reference value in response to the no-pressure time T 3 i being less than or equal to the third time threshold.

4. The method according to claim 3 , wherein the filter function is B i+1 =K*R+(1−K)*B i , wherein B i+1 represents the latest pressure reference value, B i represents the pressure reference value, K represents a filter coefficient in an infinite impulse response IIR filter algorithm, and R represents the i-th pressure value.

5. The method according to claim 1 , wherein the predetermined time length is a sampling cycle for the pressure sensor.

6. The method according to claim 1 , wherein the first time threshold is in a range of 5 s to 10 s, and the second time threshold is less than or equal to the first time threshold.

7. The method according to claim 6 , wherein the first time threshold is in a range of 8 s to 10 s, and/or the second time threshold is 3 s.

8. The method according to claim 7 , wherein the first pressure threshold is a pressure value corresponding to a weight of 150 g, and the second pressure threshold is a pressure value corresponding to a weight of −150 g.

9. A chip, comprising a processor configured to call and execute a computer program from a memory to perform the method according to claim 1 .

10. An apparatus for determining a pressure reference value, applicable to an electronic device equipped with a pressure sensor, comprising:
a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to, when calling and running the computer program stored in the memory, perform operations of:
consecutively acquiring N pressure signals by the pressure sensor, and acquiring consecutive N pressure values on the basis of the N pressure signals; and
determining a latest pressure reference value on the basis of the consecutive N pressure values and time characteristics of the consecutively acquired N pressure signals for replacing a current pressure reference value;
wherein each of the pressure values is a difference between a sampling value corresponding to a pressure signal and the current pressure reference value, and the consecutively acquired N pressure signals are acquired within a duration in which a pressure is applied to the pressure sensor once, N being a positive integer greater than 0
wherein determining the latest pressure reference value on the basis of the consecutive N pressure values and the time characteristics of the consecutively acquired N pressure signals for replacing the current pressure reference value comprises:
identifying a magnitude relationship between an i-th pressure value and a first pressure threshold and/or a second pressure threshold, wherein the first pressure threshold is used to indicate whether the pressure sensor is subjected to a positive pressure from outside to inside, and the second pressure threshold is used to indicate whether the pressure sensor is subjected to a negative pressure from inside to outside; and
updating a positive pressure time T 1 i according to T 1 i =T i−1 +predetermined time length in response to the i-th pressure value being greater than the first pressure threshold, wherein the positive pressure time T 1 i is used to indicate a duration in which the pressure signal is at a positive pressure; and determining a sampling value corresponding to the i-th pressure value as the latest pressure reference value in response to the positive pressure time T 1 i being greater than a first time threshold for replacing the current pressure reference value, or
updating a negative pressure time T 2 i according to T 2 i =T 2 i−1 +predetermined time length in response to the i-th pressure value being less than the second pressure threshold, wherein the negative pressure time T 2 i is used to indicate a duration in which the pressure signal is at a

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• Wei Haijun

Classifications

• G01L5/00

  Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes · CPC title

• G01L1/26

  Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload · CPC title

• G06F3/011

  Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00) · CPC title

• G06F3/038

  Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry · CPC title

• G06F3/03547

  Touch pads, in which fingers can move on a surface · CPC title