CN112611402B - Capacitive-based steering wheel touch identification method and system - Google Patents
Capacitive-based steering wheel touch identification method and system Download PDFInfo
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- CN112611402B CN112611402B CN202011625999.0A CN202011625999A CN112611402B CN 112611402 B CN112611402 B CN 112611402B CN 202011625999 A CN202011625999 A CN 202011625999A CN 112611402 B CN112611402 B CN 112611402B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
- G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/04—Hand wheels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/032—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure affecting incoming signal, e.g. by averaging; gating undesired signals
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- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Steering Controls (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a capacitive-based steering wheel touch identification method and a capacitive-based steering wheel touch identification system, wherein the method comprises the following steps: periodically collecting and storing voltage values of a capacitive sensor in a steering wheel; averaging the collected multiple groups of voltage data; carrying out compensation processing for eliminating interference of temperature and humidity environment on the average value; and comparing the data after compensation processing with a preset touch threshold value in the control unit, if the data after compensation processing is larger than the touch threshold value, outputting a touch signal, and if not, outputting a no-touch signal. The method and the system can effectively eliminate the interference of the external environment on data acquisition, improve the accuracy and stability of data acquisition and processing of the steering wheel control system, and ensure the operation reliability and safety of the steering wheel.
Description
Technical Field
The disclosure relates to the technical field of automobile control, in particular to a steering wheel touch identification method and system based on capacitance.
Background
With the rapid development of the automobile industry, automobiles have become one of indispensable vehicles for people to go out. At present, function control switches are mounted on a plurality of automobile steering wheels, so that a driver can operate to realize various control functions without leaving the steering wheels with two hands, and the automobile steering wheel is more convenient to use.
Existing steering wheel switches have employed touch controls, such as capacitive touch sensors and inductive touch sensors. However, the touch sensor and the touch detection controller are often influenced by external factors, such as temperature and humidity, during data acquisition and processing, which causes problems of low data processing accuracy, unstable data, etc., so that the steering wheel is easily triggered by mistake, and reliability and safety of steering wheel operation are affected.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a method and a system for identifying a steering wheel touch based on a capacitance type, where the method and the device can effectively eliminate interference of an external environment on data acquisition, improve accuracy and stability of data acquisition and processing by a steering wheel control system, and ensure operational reliability and safety of a steering wheel.
In order to achieve the above purpose, the invention provides the following technical scheme:
a capacitive-based steering wheel touch recognition method comprises the following steps:
periodically collecting and storing voltage values of a capacitive sensor in a steering wheel;
averaging the collected multiple groups of voltage data;
carrying out compensation processing for eliminating interference of temperature and humidity environment on the average value;
and comparing the data after compensation processing with a preset touch threshold value in the control unit, if the data after compensation processing is larger than the touch threshold value, outputting a touch signal, and if not, outputting a no-touch signal.
The utility model provides a steering wheel touch identification system based on capacitanc, is including setting up capacitanc sensor and the control unit in the steering wheel, the control unit includes data acquisition module and data processing module, the voltage value of capacitanc sensor in the steering wheel is gathered to the data acquisition module and is exported to the data processing module, the touch identification signal is exported after the data processing module is handled received voltage value data, the data processing module includes temperature and humidity compensation module, temperature and humidity compensation module carries out the compensation processing of eliminating humiture environmental disturbance with received voltage value data, the data processing module is according to the data output touch identification signal after the compensation.
Further, the temperature and humidity compensation module obtains the temperature and humidity value of the external environment through a controller on the LIN bus.
Furthermore, the temperature and humidity compensation module compensates the data according to the calibration experiment of the relationship between the voltage value original data and the temperature and humidity environment.
Further, the calibration experiment of the relationship between the voltage value original data and the temperature and humidity environment comprises the following steps: the voltage values of the capacitive sensors in the steering wheel are collected in different temperature and humidity environments, collected voltage value original data are compared with corresponding temperature and humidity values respectively, and the relation between the voltage value original data and the temperature and humidity environments is obtained.
Further, the relation between the voltage value raw data and the temperature and humidity environment is Y = (ar + b) × X;
wherein Y is compensated data, X is original data of voltage value, a and b are constants, and r is temperature and humidity compensation coefficient.
Further, the data processing module further comprises a storage module, the storage module stores the data acquired by the data acquisition module, the data processing module calculates an average value of the stored data and compensation processing of the temperature and humidity compensation module, and compares the average value with a preset touch threshold value to output a touch identification signal.
Further, the storage module amplifies and adjusts the data acquired by the data acquisition module and then stores the data.
Further, after the storage space of the storage module is full, the average value of the stored data is calculated.
Further, after the storage space of the storage module is full, the previous data in the storage module are sequentially covered.
The invention discloses a method and a system for identifying steering wheel touch based on capacitance, which have the beneficial effects that:
1. the basic characteristic of the capacitor is fully utilized, when a hand touches a steering wheel, the distance between the upper stage and the lower stage of the capacitive sensor is changed, the contact area is changed, and the voltage is changed. The voltage value on the capacitive steering wheel sensor is collected, so that whether the steering wheel is touched or not is identified. And only the controller main MCU chip is needed to collect and process data, so that the cost is low.
2. When the system is started, the controller collects multiple groups of original data from the steering wheel capacitive sensor within a fixed time, and the consistency of the original data is ensured. The self-learning method has the advantages that the self-learning, smoothing or smoothing is carried out on the original data, so that the up-and-down fluctuation of the original data is weakened, the filtering is larger or smaller due to factors such as external interference, the more the acquired original data is, the stronger the self-learning effect is.
3. The method comprises the steps of amplifying a plurality of groups of original data, improving data resolution, averaging the amplified original data to eliminate the larger and smaller data caused by the interference of the external environment, obtaining processed intermediate data, preventing the sudden change of the data, ensuring the stability of the data, having high accuracy, preventing the steering wheel from being triggered by mistake (error identification), and meeting the requirement of function safety.
4. The influence of temperature and humidity on a steering wheel is considered, collected original data are compared under different temperature and humidity environments to obtain a coefficient r, the coefficient can be adjusted along with the different temperature and humidity environments, and temperature and humidity compensation processing is carried out on intermediate data through adjustment of the coefficient. For example, if the temperature and humidity are too high, r can be adjusted to be a negative number, the obtained final original data can be lower than the collected original data, namely, the influence of the overhigh temperature and humidity on the collected data is filtered, the influence on the data under different temperature and humidity scenes is met, the stability of the data is ensured, and the optimal value is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a steering wheel touch recognition method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a compensation calibration experiment for eliminating interference of temperature and humidity environments in the embodiment of the present invention;
FIG. 3 is a schematic view of a steering wheel structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a steering wheel touch recognition system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a voltage level of a steering wheel without a touch change according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a touch value variation voltage value of the steering wheel according to the embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure of the present disclosure. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
As shown in fig. 1-2, an embodiment of the present disclosure provides a method for identifying a touch on a steering wheel based on capacitance, including:
periodically collecting the voltage value of a capacitive sensor in the steering wheel and storing the voltage value;
after the storage space is full, amplifying all voltage data, then obtaining an average value, and performing compensation processing for eliminating interference of temperature and humidity environments on the average value;
after the system is normally powered on, the voltage value of a capacitive sensor layer in the steering wheel is periodically acquired, the acquired data is amplified and adjusted and then stored, and after the storage space is full, the acquired data sequentially covers the existing data in the storage space.
And comparing the data after compensation processing with a preset touch threshold value in the controller, if the data after compensation processing is larger than the touch threshold value, outputting a touch signal, and if not, outputting a no-touch signal.
The compensation calibration experiment for eliminating the interference of the temperature and humidity environment comprises the following steps: the voltage value of a capacitive sensor in the steering wheel is collected under different temperature and humidity environments, collected voltage value original data are compared with corresponding temperature and humidity values respectively, and the voltage value original data are obtained according to the relation between the voltage value original data and the temperature and humidity environments: y = (ar + b) × X; wherein, Y is the compensated data, X is the voltage value original data, a and b are constants, and r is the temperature and humidity compensation coefficient.
In the above embodiment of the invention, the basic characteristics of the capacitor are fully utilized, and when a hand touches the steering wheel, the upper and lower distances of the capacitive sensor change, the contact area changes, and the voltage changes. The voltage value on the capacitive steering wheel sensor is collected, so that whether the steering wheel is touched or not is identified. When the system is started, the controller collects multiple groups of original data from the steering wheel capacitive sensor within a fixed time, and the consistency of the original data is ensured. The method comprises the steps of amplifying a plurality of groups of original data, improving data resolution, and averaging the amplified original data to eliminate the partial size of some data caused by the interference of the external environment. And obtaining the processed intermediate data. Temperature and humidity compensation processing is carried out on the intermediate data, the influence on the data under different temperature and humidity scenes is met, the stability of the data is guaranteed, and the optimal value is obtained.
The invention also provides a capacitive-based steering wheel touch recognition system which comprises a capacitive sensor and a control unit, wherein the capacitive sensor and the control unit are arranged in the steering wheel, the control unit comprises a data acquisition module and a data processing module, the data acquisition module acquires the voltage value of the capacitive sensor in the steering wheel and outputs the voltage value to the data processing module, the data processing module processes the received voltage value data and then outputs a touch recognition signal, and the capacitive-based steering wheel touch recognition system also comprises a power supply system, and the power supply system is connected with the control unit. The data processing module comprises a temperature and humidity compensation module, the temperature and humidity compensation module carries out compensation processing for eliminating temperature and humidity environment interference on received voltage value data, and the data processing module outputs a touch identification signal according to compensated data. The temperature and humidity compensation module compensates the data according to the calibration experiment of the relationship between the voltage value original data and the temperature and humidity environment. The calibration experiment of the relation between the voltage value original data and the temperature and humidity environment comprises the following steps: the voltage values of the capacitive sensors in the steering wheel are collected in different temperature and humidity environments, collected voltage value original data are compared with corresponding temperature and humidity values respectively, and the relation between the voltage value original data and the temperature and humidity environments is obtained.
Specifically, the relation between the voltage value raw data and the temperature and humidity environment is Y = (ar + b) × X;
wherein Y is compensated data, X is original data of voltage value, a and b are constants, and r is temperature and humidity compensation coefficient.
In a preferred embodiment, the data processing module further includes a storage module, the storage module stores the data acquired by the data acquisition module, and the data processing module calculates an average value of the stored data and compensation processing of the temperature and humidity compensation module, compares the average value with a preset touch threshold, and outputs a touch identification signal.
Referring to fig. 3, in a preferred embodiment, the steering wheel includes an iron ring layer 1, a foam layer 2, a shielding layer 3, a capacitive sensor layer 4 and a leather layer 5 in this order from inside to outside. A structure similar to a capacitor is formed between the capacitive sensor layer 4 and the shielding layer 3, the shielding layer 3 mainly shields external interference, and the control unit mainly acquires a voltage value on the sensor layer.
In addition, for the purpose of further cost reduction, the temperature and humidity values of the external environment can be obtained by other controllers on the LIN bus, as shown in fig. 4.
The working principle of the invention is as follows:
1. after the system is electrified and normally works, a data acquisition module in the control unit periodically acquires the voltage value of a sensor layer in the steering wheel, a data processing module amplifies and adjusts the acquired data and then stores the data in a buffer, and when the buffer is full of data, the acquired data sequentially cover the front data in the buffer.
2. Averaging all data in the buffer, sending the averaged data to a temperature and humidity compensation module, eliminating the interference of a temperature and humidity environment, and considering two conditions: firstly, if external humiture is bigger, the data that the controller gathered this moment can become bigger, and temperature and humidity compensation coefficient r can be adjusted to a negative number, reduces the raw data of gathering, seeks final compensation data. And secondly, if the external temperature and humidity are low, the data acquired by the data acquisition module is small, the temperature and humidity compensation coefficient r can be adjusted to be a positive number, the acquired original data value is improved, and the final compensation data is obtained.
3. And finally, comparing the compensated data with a touch threshold value stored in a data processing module to judge whether the data is touch or not:
one is no touch if the last compensation data is less than or equal to the touch threshold.
And secondly, if the final compensation data is larger than the touch threshold value, the touch is regarded as the touch.
The state of the steering wheel is divided into two types:
firstly, when the hand does not touch the steering wheel, the voltage value on the sensor layer does not fluctuate too much, the data acquisition module acquires data more stably, and the finally obtained compensation data is also more stable, as shown in fig. 5, and finally no touch is determined.
Secondly, when the hand starts to touch the steering wheel, the voltage value on the sensor layer starts to change, the data value acquired by the data acquisition module is rapidly increased from small to large, and when the hand completely contacts the steering wheel, the data acquired by the data acquisition module is slowly stabilized after being increased to a certain degree, as shown in fig. 6, after the influence of temperature and humidity is eliminated, the touch is judged by comparing the compensated data.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (7)
1. A capacitive-based steering wheel touch recognition method is characterized by comprising the following steps:
periodically collecting the voltage value of a capacitive sensor in the steering wheel and storing the voltage value;
averaging the collected multiple groups of voltage data;
carrying out compensation processing for eliminating interference of temperature and humidity environment on the average value;
comparing the data after compensation processing with a touch threshold preset in a control unit, if the data after compensation processing is larger than the touch threshold, outputting a touch signal, and if not, outputting a no-touch signal;
the compensation processing step comprises the steps of adjusting the average value of voltage data acquired under the current temperature and humidity environment according to a calibration test of the relation between the voltage value original data and the corresponding temperature and humidity environment;
the calibration experiment of the relationship between the voltage value original data and the corresponding temperature and humidity environment comprises the following steps: collecting voltage values of a capacitive sensor in a steering wheel in different temperature and humidity environments, and comparing the collected voltage value raw data with corresponding temperature and humidity values respectively to obtain the relation between the voltage value raw data and the temperature and humidity environments, so as to obtain Y = (ar + b) × X; wherein Y is compensated data, X is original data of voltage value, a and b are constants, and r is temperature and humidity compensation coefficient.
2. A capacitive-based steering wheel touch recognition system comprises a capacitive sensor and a control unit, wherein the capacitive sensor and the control unit are arranged in a steering wheel, the control unit comprises a data acquisition module and a data processing module, the data acquisition module acquires a voltage value of the capacitive sensor in the steering wheel and outputs the voltage value to the data processing module, the data processing module processes received voltage value data and then outputs a touch recognition signal, and the capacitive-based steering wheel touch recognition system is characterized in that,
the data processing module comprises a temperature and humidity compensation module, the temperature and humidity compensation module carries out compensation processing for eliminating temperature and humidity environment interference on received voltage value data, and the data processing module outputs a touch identification signal according to compensated data;
the temperature and humidity compensation module is used for compensating data according to calibration experiment determination of the relation between the voltage value original data and the temperature and humidity environment;
the calibration experiment of the relation between the voltage value original data and the temperature and humidity environment comprises the following steps: collecting voltage values of a capacitive sensor in a steering wheel in different temperature and humidity environments, and comparing collected voltage value original data with corresponding temperature and humidity values respectively to obtain a relation between the voltage value original data and the temperature and humidity environments;
the relation between the voltage value original data and the temperature and humidity environment is Y = (ar + b) × X;
wherein Y is compensated data, X is original data of voltage value, a and b are constants, and r is temperature and humidity compensation coefficient.
3. The system for identifying a touch to a steering wheel of claim 2, wherein the temperature and humidity compensation module obtains the temperature and humidity values of the external environment through a controller on a LIN bus.
4. The system for identifying a touch to a steering wheel according to claim 2, wherein the data processing module further comprises a storage module, the storage module stores the data acquired by the data acquisition module, and the data processing module calculates an average value of the stored data and the compensation processing of the temperature and humidity compensation module, compares the average value with a preset touch threshold value, and outputs a touch identification signal.
5. The system for identifying a touch on a steering wheel according to claim 4, wherein the storage module amplifies and adjusts the data collected by the data collection module and stores the amplified and adjusted data.
6. The system of claim 4, wherein the average of the stored data is calculated after the storage space of the storage module is full.
7. The system of claim 4, wherein the memory module is configured to sequentially overwrite previous data in the memory module when the memory space of the memory module is full.
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| CN103488364B (en) * | 2013-09-29 | 2017-08-25 | 深圳Tcl工业研究院有限公司 | A kind of capacitive touch screen and its self-adapting correction method, system |
| CN203562090U (en) * | 2013-12-03 | 2014-04-23 | 厦门祺圣电子科技有限公司 | Multifunctional remote touch controller |
| US9665217B2 (en) * | 2014-04-28 | 2017-05-30 | Qualcomm Incorporated | Touch panel scan control |
| US9582111B2 (en) * | 2014-10-31 | 2017-02-28 | Semtech Corporation | Method and device for improved accuracy of proximity and touch detection in mobile devices |
| KR102413108B1 (en) * | 2015-12-08 | 2022-06-27 | 삼성전자주식회사 | Method and electronic device for recognizing touch |
| CN207851794U (en) * | 2017-12-07 | 2018-09-11 | 深圳市拓步锐科技有限公司 | Capacitive touch screen with automatic temperature drift compensation function |
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