Tactile vibration control system and method for smart terminal

Patent metadata

Field	Value
Publication number	US-10122310-B2
Application number	US-201615324237-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Dec 31, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A tactile vibration control system and method for a smart terminal. The system includes: a command generator, a tactile driver, a linear resonant actuator, a sensing module, a feedback unit and a comparator; by arranging a plurality of sensors that monitor or sense the vibrating status of the linear resonant actuator, channels of the sensor signals are generated when the actuator vibrates; the feedback unit sends the sensing signals characterizing the physical quantities related to the vibration modes output by the plurality of sensors to the comparator as the feedback signal; and the comparator generates an error signal according to the feedback signal and a desired signal in the input signal and sends the error signal to the command generator so that the command generator adjusts the generated initial commanding signal according to the error signal and achieves the close-loop control of the linear resonant actuator.

First claim

The invention claimed is:

1. Tactile vibration control system for a smart terminal, comprises: a command generator, a tactile driver, a filter, a linear resonant actuator, a sensing module, a feedback unit and a comparator;
the command generator generates an initial commanding signal according to an input signal, adjusts the initial commanding signal to an adjusted commanding signal according to an error signal sent by the comparator and sends the adjusted commanding signal to the tactile driver;
the tactile driver generates a driving signal according to the adjusted commanding signal received and sends the generated driving signal to the linear resonant actuator;
the filter is connected between the command generator and the tactile driver, the filter filtering the adjusted commanding signal so that amplitudes of a predetermined number of initial pulses of the filtered commanding signal are larger than a set threshold and phases of a predetermined number of ending pulses reverse;
the linear resonant actuator receives the driving signal and is driven by the driving signal to vibrate;
the sensing module comprises different types of sensors in which each type of the sensors in real time senses a status of the linear resonant actuator and generates a corresponding sensing signal when sensing the vibration of the linear resonant actuator;
the feedback unit fuses multiple channels of sensing signals generated by the sensing module, obtains a feedback signal for estimating the vibration mode of the linear resonant actuator, and sends the feedback signal to the comparator; and
the comparator compares the feedback signal with a desired signal characterizing the vibration mode of the linear resonant actuator in the input signal, generates an error signal according to the comparison result, and sends the error signal to the command generator.

2. Tactile vibration control system according to claim 1 , wherein the feedback unit comprises: an acquisition module and a weighing module;
the acquisition module receives the multiple channels of sensing signals sent by the sensing module, acquires a physical quantity observation value of each channel of the sensing signals, and converts different types of physical quantity observation values into one and same type of physical quantity observation value under one and same reference system;
the weighing module calculates a weighing coefficient of the physical quantity observation value of each channel of the sensing signals, sums the physical quantity observation value of each channel of the sensing signals according to the respective weighing coefficient, obtains a physical quantity estimation value for estimating the vibration mode of the linear resonant actuator, generates the feedback signal according to the physical quantity estimation value and then sends the feedback signal to the comparator; and
the comparator compares the physical quantity estimation value of the feedback signal with a desired value of the physical quantity in the desired signal and generates an error signal according to a comparison result.

3. Tactile vibration control system according to claim 1 , wherein the sensing module comprises a back electromotive force sensing circuit which is provided on the linear resonant actuator and generates a back electromotive force signal when the linear resonant actuator vibrates; and/or,
the sensing module comprises a motion sensor which is provided at a position separated from the linear resonant actuator in the smart terminal, the motion sensor generating a corresponding motion sensing signal when the linear resonant actuator vibrates; and/or,
the sensing module comprises a motion sensor which is provided on the linear resonant actuator, the motion sensor generating a corresponding motion sensing signal when the linear resonant actuator vibrates;
wherein, the motion sensors at least comprise one or more of acceleration sensors, laser Doppler vibrometers, microphones and gyroscopes.

4. Tactile vibration control system according to claim 1 , wherein
the command generator reads a vibration mode list in a vibration effect library, and selects a sequence of physical quantities corresponding to a desired vibration mode and characterizing vibration effect from the vibration mode list according to a selecting command in the input signal, the sequence of physical quantities being used as the initial commanding signal; or
the command generator acquires from media streaming data in the input signal a physical signal characterizing vibration effect derived from the media streaming data, the physical signal being used as the initial commanding signal.

5. Tactile vibration control system according to claim 1 , wherein a time domain signal of the filter is an impulse signal, and the filter is set by the following method:
calculating a damped resonant period of the linear resonant actuator by a resonant frequency and a damping ratio of the linear resonant actuator, and then determining an impulse moment of each impulse of the filter by the damped resonant period; and
calculating an impulse amplitude of each impulse by the damping ratio of the linear resonant actuator.

6. Tactile vibration control system according to claim 5 , wherein the impulse signal comprises two impulses, and the impulse moment and impulse amplitude of each impulse are calculated by the following formula:

{

t
1

=
0

,

A
1

=

1

1
+

e

-
ζπ

1
-

ζ
2

t
2

=

σ
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⁢
g
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1

1
-

Assignees

• Goertek Inc

Inventors

• Li Bo
• Feng Yongqiang
• Lou Shasha

Classifications

• H02K33/04

  wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation · CPC title

• G08B6/00

  Tactile signalling systems, e.g. tactile personal calling systems · CPC title

• G05D19/02 Primary

  characterised by the use of electric means · CPC title

• H02P25/032 Primary

  Reciprocating, oscillating or vibrating motors · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title