CN111552415B - High-safety-level touch device and method for airplane - Google Patents
High-safety-level touch device and method for airplane Download PDFInfo
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- CN111552415B CN111552415B CN202010362604.6A CN202010362604A CN111552415B CN 111552415 B CN111552415 B CN 111552415B CN 202010362604 A CN202010362604 A CN 202010362604A CN 111552415 B CN111552415 B CN 111552415B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- Position Input By Displaying (AREA)
Abstract
The invention belongs to the technical field of safety of aerospace display and control equipment, and discloses a high-safety-level touch device for an airplane, which sequentially comprises the following components from top to bottom: the device comprises protective glass, a touch sensor and a display, and further comprises a strain sensor, a touch controller and a main processor; the strain inductor is arranged below the protective glass; the output end of the touch sensor and the output end of the strain sensor are respectively connected with the data input end of the touch controller; the touch controller is connected with the main processor through a data line, and the driving output end of the main processor is connected with the driving input end of the display, so that the problem of low safety level of the current capacitive touch screen is solved, and the application range of the touch screen in the aerospace field is expanded.
Description
Technical Field
The invention belongs to the technical field of safety of aerospace display and control equipment, and particularly relates to a high-safety-level touch device for an airplane.
Background
The capacitive touch screen is widely applied to the field of consumer electronics, particularly mobile intelligent terminals such as mobile phones, due to excellent touch sensitivity and excellent user experience. The application of the technology to aircrafts such as airplanes and the like, particularly to the inner part of a civil airplane cockpit is a current technical hotspot.
However, the processing object of the capacitive touch screen is a finger capacitance variable, the value of which is usually less than 1pF, and the capacitance sensitivity of the touch screen is usually high in order to accurately identify a finger signal. In an external noise environment or when the circuit noise of the touch screen is high, algorithm processing is incomplete, ghost points are easy to generate, and false alarm occurs on the touch screen. Such occasional small false positives generally do not pose any major problems in the consumer electronics field, but can have catastrophic consequences on a flying aircraft if a parameter deviates or is incorrect as a result.
Since 1970, FAA established a probabilistic index system characterized by 1E-9: the probability of catastrophic accidents due to all causes is 1E-6/fh (fh is flight hour); 10% 1E-6/fh =1E-7/fh of catastrophic events caused by the system only; assuming 100 catastrophic failure states on each aircraft, the probability of each catastrophic failure state occurring is 1E-9/fh. Meanwhile, the AC25.1309-1B alarm, namely 1309 clause, quantificationally defines the design assurance level of the equipment, the occurrence probability of the A-level failure is smaller than 1E-9, the occurrence probability of the B-level failure is smaller than 1E-7, the occurrence probability of the C-level failure is smaller than 1E-5, the occurrence probability of the D-level failure is smaller than 1E-3, and the safety is sequentially reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an aircraft high-safety-level touch device which is used for solving the problem that the current capacitive touch screen is low in safety level so as to expand the application range of the touch screen in the aerospace field.
In order to achieve the purpose, the invention provides the following technical scheme:
the first technical scheme is as follows:
an aircraft high security level touch device, the device comprising in order from top to bottom: the device comprises protective glass, a touch sensor and a display, and further comprises a strain sensor, a touch controller and a main processor;
the strain inductor is arranged below the protective glass;
the output end of the touch sensor and the output end of the strain sensor are respectively connected with the data input end of the touch controller;
the touch controller is connected with the main processor through a data line, and the driving output end of the main processor is connected with the driving input end of the display.
The first technical scheme of the invention has the characteristics and further improvements that:
(1) The strain sensor is arranged between the protective glass and the touch sensor, or the strain sensor is arranged between the touch sensor and the display, or the strain sensor is arranged below the display.
(2) A strain gauge interface is arranged in the touch controller;
and the output end of the strain sensor is connected with a strain capacity interface in the touch controller.
(3) The touch sensor is a capacitive touch screen;
the strain inductor is a film type resistance strain gauge, or a film type piezoelectric strain gauge, or a micro grating strain gauge.
The second technical scheme is as follows:
an aircraft high-safety-level touch method is applied to the device according to the first technical scheme, assuming that the aircraft safety levels are marked as a level A, a level B, a level C and a level D, and the dangerousness of the aircraft is reduced in sequence, and function buttons corresponding to the level A, the level B, the level C and the level D are arranged on a display, and the method is characterized by comprising the following steps of:
when the fingers approach or touch the screen, the touch controller determines the number of the fingers and the position of each finger according to the change of the coupling capacitance, and the touch controller determines the magnitude of the strain force according to whether the strain sensor outputs the strain force;
the touch controller outputs the number of the fingers, the position of each finger and the magnitude of the strain force output by the strain sensor to a main processor;
and the main processing drives the corresponding level button on the display to correspond according to a preset rule.
The second technical scheme of the invention has the characteristics and further improvements that:
(1) The main processing drives a corresponding level button on the display to correspond according to a preset rule, wherein the preset rule comprises the following steps:
if the magnitude of the strain force output by the strain sensor is zero, the main processor judges the position of touch on the display screen according to the number of the fingers output by the touch controller and the position of each finger;
if the positions of the touch on the display screen are located at the A-level button and the B-level button, the main processor shields the position information, so that the corresponding buttons are not triggered;
if the positions of the touches on the display screen are located at the C-level button and the lower-level buttons, the main processor triggers the corresponding function buttons to generate touch responses.
(2) The main processing drives the corresponding level button on the display to correspond according to a preset rule, and the preset rule further comprises the following steps:
if the magnitude of the strain force output by the strain sensor is not zero, the main processor determines the magnitude and the position of the strain force output by the strain sensor, and determines the position of touch on the display screen according to the number of the fingers output by the touch controller and the position of each finger;
calculating the distance between the position of the strain force and the position of the touch on the display screen according to the position of the strain force and the position of the touch on the display screen;
and if the distance between the main processor and the touch screen is less than the preset distance and the strain force is greater than the preset value, responding the function button at any level by the main processor according to the position of the touch on the display screen to generate corresponding touch response.
(3) The main processing drives the corresponding level button on the display to correspond according to a preset rule, and the preset rule further comprises the following steps:
if the distance between the A-level button and the B-level button is larger than the preset distance or the strain force is smaller than the preset value, determining whether the position where the touch occurs on the display screen is located at the position corresponding to the A-level button and the B-level button;
if the button is located at the position corresponding to the A-level button and the B-level button, the main processor shields the position information and enables the corresponding button not to be triggered; and if the button is positioned at the position corresponding to the C-level button and the lower-level button, the main processor triggers the corresponding function button to generate a touch response.
Drawings
Fig. 1 is a schematic structural diagram of a conventional capacitive touch screen;
fig. 2 is a schematic structural diagram of an improved capacitive touch screen according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The current capacitive touch screen device design guarantees a class C, and for class a and class B applications, the capacitive touch screen is prohibited from being used in order to prevent accidents.
TABLE 1 safety design level description
In the conventional capacitive touch screen scheme, as shown in fig. 1, a touch Sensor is composed of driving electrodes and sensing electrodes, and coupling capacitors exist at intersections of the electrodes. When the finger is close to the Sensor, the coupling capacitance value changes, the signal on the sensing electrode also changes correspondingly, and the signal is resolved through an algorithm in the touch controller, so that the position of the finger is positioned. The finger position information is sent to the main processor through a data line, the resolution ratio of the finger position information reported by the touch screen is generally consistent with the resolution ratio of the display, and if the position information is located on the corresponding function button, the function button generates a corresponding response. Similarly, when noise or interference occurs on the touch Sensor, the coupling capacitance value will also change, and position information of a fake finger ("ghost point") will be reported. To prevent catastrophic or dangerous accidents due to class a and B accidents, the main processor usually responds only to the functional buttons of class C and below, which need to be triggered by other devices with corresponding guaranteed design levels, such as physical keys.
The improved high-security capacitive touch scheme of the present invention, as shown in fig. 2, mainly includes: strain sensors (thin film resistance strain gauge, thin film piezoelectric strain gauge or micro grating strain gauge, etc.) located between the LENS (protective glass) and the display, strain gauge interfaces located in the touch controller, corresponding algorithms, etc.
The technical scheme of the invention is as follows: when a finger approaches or lightly touches the screen, the touch Sensor has signal change, and the strain Sensor has no signal change, the main processor only responds to the functional buttons of the C level and below to obtain the excellent user experience of the capacitive touch screen, thereby avoiding disastrous or dangerous accidents. When the touch screen is touched by a finger, the touch Sensor has signal change, and the strain Sensor also has signal change, the main processor responds to the functional buttons of all safety levels according to the finger position information, so that the application range of the touch screen is expanded to all safety levels.
The mathematical principle is as follows: the design guarantee level of the capacitive touch screen device is approximately C level, the failure occurrence probability is smaller than 1E-5, the design guarantee level of the strain sensor is approximately C level, the failure occurrence probability is smaller than 1E-5, the probability of failure occurring in the capacitive touch screen device and the strain sensor is 1E-5 x 1E-5=1E-10 and smaller than 1E-9, the design guarantee level of the A level is met, and therefore the capacitive touch screen device can be used as input trigger of function buttons of the A level and all levels below.
Referring to fig. 2, the flow of the embodiment of the present invention is as follows:
(1) When a finger approaches or touches the screen, the coupling capacitance changes, and the strain sensor generates a corresponding output (if strain occurs). The change information and the output value are transmitted to the touch controller for processing.
(2) The touch controller calculates information such as the number and position of fingers [ ID1, x1, y1, S1, delta x1, delta y1 ], \8230 ], (ID 10, x10, y10, S10, delta x10, delta y 10) ] according to the change of the coupling capacitance, and assuming that at most 10 fingers exist, ID1 represents the number of the first finger, x1 represents the abscissa of the first finger, y1 represents the ordinate of the first finger, S1 represents the area of the first finger, delta x1 represents the transverse span of the first finger, delta y1 represents the longitudinal span of the first finger, and the rest is analogized, ID, x and y are core information, and the rest are auxiliary information. The touch controller judges whether the Strain sensor has output Strain [ m1, n1, value1 ], \8230 ], (mz, nz, value z) ] according to the output of the Strain sensor, and supposes that the Strain sensors have a maximum of z Strain sensors, m1 represents the abscissa of the first Strain sensor, n1 represents the ordinate of the first Strain sensor, value1 represents the numerical Value of the first Strain sensor, and the rest is similar.
(3) Sensor [ ID1, x1, y1, S1, Δ x1, Δ y1 ], \ 8230 [ ("ID 10, x10, y10, S10, Δ x10, Δ y10 ]) information, and string [ m1, n1, value1 ], \ 8230 ], (mz, nz, value z) ] information are transferred from the touch controller to the host processor through the data line.
(4) And the main processor analyzes the Sensor information and the string information, and if the uploaded data only contains the Sensor information and does not contain the string information, the ID number and the corresponding x and y coordinates in the Sensor are extracted, and the positions where the touches occur are judged. If the button is positioned at the position of the A-level button and the B-level button (see the yellow button in the figure 2), in order to prevent the A-level accident and the B-level accident from causing disastrous or dangerous accidents, the main processor shields the position information and ensures that the corresponding button is not triggered; if the button is located at the C-level button and the lower-level buttons, the corresponding function button is triggered to generate a touch response.
(5) And the main processor analyzes the Sensor information and the string information, and if the uploaded data not only contains the Sensor information but also contains the string information, the ID number and the corresponding x and y coordinates in the Sensor are extracted, and the position information and the numerical value in the string are extracted. From the Sensor position data and the string position data, the distance between them is calculated. If the distance between the two is close and the value of the string is larger, responding to all the functional buttons of the security level according to the Sensor position information to generate corresponding touch response; if the former 'the distance between the two buttons is short and the value of string is large' is not satisfied, then it is determined whether the Sensor position is located at the position of the button of the class a and the button of the class B (see the yellow button in fig. 2).
According to the technical scheme, the safety level of the capacitive touch screen is improved, and the application range of the capacitive touch screen in the aerospace field is expanded. The capacitive touch screen can be applied to all security level applications; the user experience of the motion scene of the capacitive touch screen is improved. Even if the capacitive touch screen does not fail, the touch of the fingers is inaccurate due to movement, so that misoperation is generated, and the occurrence of the misoperation can be reduced by introducing strain information.
Claims (3)
1. The method is applied to an aircraft high-safety-level touch device, and the device sequentially comprises the following steps from top to bottom: the device is characterized by further comprising a strain sensor, a touch controller and a main processor;
the strain inductor is arranged below the protective glass;
the output end of the touch sensor and the output end of the strain sensor are respectively connected with the data input end of the touch controller;
the touch controller is connected with the main processor through a data line, and the driving output end of the main processor is connected with the driving input end of the display;
the strain sensor is arranged between the protective glass and the touch sensor, or between the touch sensor and the display, or below the display;
a dependent variable interface is arranged in the touch controller;
the output end of the strain sensor is connected with a strain capacity interface in the touch controller;
the touch sensor is a capacitive touch screen;
the strain sensor is a film type resistance strain gauge, or a film type piezoelectric strain gauge, or a micro grating strain gauge;
assuming that the safety levels of the airplane are marked as A level, B level, C level and D level, and the dangerousness of the airplane is reduced in sequence, and function buttons corresponding to the A level, the B level, the C level and the D level are arranged on the display, the method comprises the following steps:
when a finger approaches or touches the screen, the touch controller determines the number of fingers and the position of each finger according to the change of the coupling capacitance, and the touch controller determines the magnitude of the strain force according to whether the strain sensor outputs or not;
the touch controller outputs the number of the fingers, the position of each finger and the magnitude of the strain force output by the strain sensor to a main processor;
the main processor drives the corresponding level buttons on the display to perform corresponding processing according to a preset rule; the preset rules comprise:
if the magnitude of the strain force output by the strain sensor is zero, the main processor judges the position of touch on the display screen according to the number of the fingers output by the touch controller and the position of each finger;
if the positions of the touch on the display screen are located at the positions of the A-level button and the B-level button, the main processor shields the position information and enables the corresponding buttons not to be triggered;
and if the positions of the touches on the display screen are positioned at the C-level button and the lower-level button, the main processor triggers the corresponding function button to generate touch response.
2. The aircraft high-security-level touch method according to claim 1, wherein the main processor drives a corresponding level button on a display to perform corresponding processing according to a preset rule, and the preset rule further comprises:
if the magnitude of the strain force output by the strain sensor is not zero, the main processor determines the magnitude and the position of the strain force output by the strain sensor, and determines the position of touch on the display screen according to the number of the fingers output by the touch controller and the position of each finger;
calculating the distance between the position of the strain force and the position of the touch on the display screen according to the position of the strain force and the position of the touch on the display screen;
and if the distance between the main processor and the touch screen is less than the preset distance and the strain force is greater than the preset value, responding the function button at any level by the main processor according to the position of the touch on the display screen to generate corresponding touch response.
3. The aircraft high-security-level touch method according to claim 2, wherein the main processor drives a corresponding level button on a display to respond according to a preset rule, and the preset rule further comprises:
if the distance between the A-level button and the B-level button is larger than the preset distance or the strain force is smaller than the preset value, determining whether the position where the touch occurs on the display screen is located at the position corresponding to the A-level button and the B-level button;
if the button is located at the position corresponding to the A-level button and the B-level button, the main processor shields the position information and enables the corresponding button not to be triggered; and if the main processor is positioned at the corresponding positions of the C-level button and the lower-level button, the main processor triggers the corresponding function button to generate a touch response.
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