阅读说明：本技术 一种基于eol一致性标定的车载触摸方向盘压力检测方法 (Vehicle-mounted touch steering wheel pressure detection method based on EOL consistency calibration ) 是由 刘龙细 黎家业 张顺聪 于 2021-08-27 设计创作，主要内容包括：本发明涉及车载触摸方向盘压力的检测技术领域,特别涉及一种基于EOL一致性标定的车载触摸方向盘压力检测方法,包括以下步骤：S1,预先设定产品面板上的压力特征点；S2,将所述产品面板上的每一按键压力信号值相对所述压力特征点形成对应的线性函数；S3,将所有所述线性函数形成数据矩阵；S4,在EOL过程中将所述压力特征点进行标定,其余按键的压力阈值根据所述数据矩阵计算得出。本发明的提出解决了现有的车载触摸方向盘上按键压力检测直接采用压力传感器、压电陶瓷进行,但该方式成本较高,不利于产品的平台化推广,同时容易由于装配误差与制造精度的影响,导致样机的一致性较差的问题。(The invention relates to the technical field of detection of vehicle-mounted touch steering wheel pressure, in particular to a vehicle-mounted touch steering wheel pressure detection method based on EOL consistency calibration, which comprises the following steps of: s1, presetting pressure characteristic points on the product panel; s2, forming a corresponding linear function of each key pressure signal value on the product panel relative to the pressure characteristic point; s3, forming a data matrix by all the linear functions; and S4, calibrating the pressure characteristic points in the EOL process, and calculating the pressure thresholds of the other keys according to the data matrix. The invention solves the problems that the existing method for detecting the pressure of the keys on the vehicle-mounted touch steering wheel directly adopts a pressure sensor and piezoelectric ceramics, but the method has higher cost and is not beneficial to the platform popularization of products, and meanwhile, the consistency of a prototype is poor due to the influence of assembly errors and manufacturing precision.)

1. A pressure detection method for a vehicle-mounted touch steering wheel based on EOL consistency calibration is characterized by comprising the following steps:

s1, presetting pressure characteristic points on the product panel;

s2, forming a corresponding linear function of each key pressure signal value on the product panel relative to the pressure characteristic point;

s3, forming a data matrix by all the linear functions;

and S4, calibrating the pressure characteristic points in the EOL process, and calculating the pressure thresholds of the other keys according to the data matrix.

2. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to claim 1, wherein the method comprises the following steps:

in the step S1, pressure feature points on the product panel are preset, specifically, the pressure feature points on the product panel are obtained based on a method of fitting preliminary test data and big data.

3. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to claim 2, wherein the step S1 specifically includes:

s11, dividing the product panel into a plurality of grids;

s12, performing pressure test on all the grids, and correspondingly storing the pressure test results;

and S13, extracting the pressure test result and forming the pressure characteristic point.

4. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to claim 3, wherein the method comprises the following steps:

as a result of the pressure test in the steps S12 and S13, the grid is pressed at a predetermined pressing force, and whether there is a capacitance change is tested.

5. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to claim 4, wherein the step S2 specifically includes:

s21, setting each key of the product panel as a pressure test point;

and S22, acquiring the data of all the pressure test points in the pressure test result, and forming a corresponding linear function.

6. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to any one of claims 1 to 5, wherein the step S4 specifically comprises:

s41, converting all the pressure characteristic points into pressure test points of the EOL process;

s42, acquiring a pressure threshold value of each pressure test point;

and S43, calculating the actual pressure threshold of all the keys according to the data matrix.

7. The method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration according to claim 6, wherein the method comprises the following steps:

in step S43, the actual pressure thresholds of all the keys are calculated according to the data matrix, specifically, the actual pressure thresholds of all the keys are calculated by automatic interpolation according to the data matrix and the pressure thresholds of all the pressure test points.

Technical Field

The invention relates to the technical field of detection of vehicle-mounted touch steering wheel pressure, in particular to a vehicle-mounted touch steering wheel pressure detection method based on EOL consistency calibration.

Background

In the vehicle-mounted touch steering wheel, since the key switches on the steering wheel are adjusted to be touch-controlled, the relationship between the magnitude of the detected touch pressure and whether the touch action is responded needs to be calibrated before shipping. The power supply system EOL comprehensive test system realizes full intellectualization and automation of the whole work flow by integrating various functions of battery charge and discharge test, battery safety regulation detection, battery parameter test, BMS test, auxiliary function test and the like in a device integration mode and adopting methods of bar code binding, automatic starting test and automatic judgment of test results, and achieves the purposes of reducing operators and improving test efficiency.

The existing touch pressure detection usually adopts a pressure sensor, piezoelectric ceramics and the like to directly acquire a pressure signal, namely, the pressure is sensed by converting the change of displacement generated by force into the change of voltage.

However, the existing pressure detection method has the following problems: 1) the pressure sensor and the piezoelectric ceramic have higher part prices, so that the cost of the detection scheme is high, and the platform popularization of the product is not facilitated; 2) under the influence of factors such as assembly error, manufacturing accuracy and the like, the problems of poor consistency of a prototype, large difference of pressure handfeel and large difference of key handfeel are caused.

Therefore, a method for detecting the pressure of the vehicle-mounted touch steering wheel based on EOL consistency calibration is developed.

Disclosure of Invention

The invention provides a vehicle-mounted touch steering wheel pressure detection method based on EOL consistency calibration, and mainly solves the problems that the existing vehicle-mounted touch steering wheel is directly subjected to key pressure detection by adopting a pressure sensor and piezoelectric ceramics, but the method is high in cost and not beneficial to the platform popularization of products, and meanwhile, the consistency of a prototype is poor due to the influence of assembly errors and manufacturing precision.

The invention provides a vehicle-mounted touch steering wheel pressure detection method based on EOL consistency calibration, which comprises the following steps of:

s1, presetting pressure characteristic points on the product panel;

s2, forming a corresponding linear function of each key pressure signal value on the product panel relative to the pressure characteristic point;

s3, forming a data matrix by all the linear functions;

and S4, calibrating the pressure characteristic points in the EOL process, and calculating the pressure thresholds of the other keys according to the data matrix.

Preferably, in step S1, the pressure feature points on the product panel are preset, specifically, the pressure feature points on the product panel are obtained based on previous test data and a big data fitting method.

Preferably, the step S1 specifically includes:

s11, dividing the product panel into a plurality of grids;

s12, performing pressure test on all the grids, and correspondingly storing the pressure test results;

and S13, extracting the pressure test result and forming the pressure characteristic point.

Preferably, the step S12 and the pressure test result in the step S13 are to press the corresponding grid with a set pressing force and to test whether there is a capacitance change.

Preferably, the step S2 specifically includes:

s21, setting each key of the product panel as a pressure test point;

and S22, acquiring the data of all the pressure test points in the pressure test result, and forming a corresponding linear function.

Preferably, the step S4 specifically includes:

s41, converting all the pressure characteristic points into pressure test points of the EOL process;

s42, acquiring a pressure threshold value of each pressure test point;

and S43, calculating the actual pressure threshold of all the keys according to the data matrix.

Preferably, in step S43, the actual pressure thresholds of all the keys are calculated according to the data matrix, specifically, the actual pressure thresholds of all the keys are obtained through automatic interpolation calculation according to the data matrix and the pressure thresholds of all the pressure test points.

From the above, the following beneficial effects can be obtained by applying the technical scheme provided by the invention:

firstly, the method provided by the invention senses the pressure by converting the displacement change generated by the force into the change of the induction capacitance, so that the detection cost can be greatly reduced, and the product competitiveness is improved;

secondly, the consistency of a prototype is effectively ensured by the EOL consistency calibration method in the method provided by the invention, and meanwhile, only a few pressure characteristic points need to be calibrated, so that the calibration time in the production process can be greatly shortened, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a pressure sensing test environment in an embodiment of the present invention;

FIG. 2 is a data processing procedure in an embodiment of the present invention;

FIG. 3 is a schematic diagram of an EOL test process according to an embodiment of the present invention;

fig. 4 is a schematic process diagram of calibration of the pressure threshold implemented by the EOL software in the embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

The existing vehicle-mounted touch steering wheel is directly subjected to key pressure detection by adopting a pressure sensor and piezoelectric ceramics, but the mode has higher cost and is not beneficial to the platform popularization of products, and meanwhile, the problem of poor consistency of a prototype is easily caused due to the influence of assembly errors and manufacturing precision.

As shown in fig. 1 to 4, in order to solve the above problem, the present embodiment provides a method for detecting a pressure of a vehicle-mounted touch steering wheel based on EOL consistency calibration, which mainly includes the following steps:

s1, presetting pressure characteristic points on the product panel;

s2, forming a corresponding linear function from each key pressure signal on the product panel to the relative pressure characteristic point;

s3, forming a data matrix by all linear functions;

and S4, calibrating the pressure characteristic points in the EOL process, and calculating the pressure thresholds of the other keys according to the data matrix.

Preferably, but not limited to, the product panel in this embodiment is a vehicle-mounted touch steering wheel.

Preferably, in step S1, the pressure characteristic points of the product panel are preset, specifically, the pressure characteristic points on the product panel are obtained based on the previous test data and the big data fitting method.

Specifically, step S1 includes:

s11, dividing the product panel into a plurality of grids;

s12, performing pressure test on all grids, and correspondingly storing pressure test results;

and S13, extracting the pressure test result and forming a pressure characteristic point.

In step S12 and the pressure test result in step S13, specifically, the grid is pressed with the set pressing force, and the capacitance change of the ground beans is tested.

Preferably, but not limited to, in this embodiment, the product panel is placed in the pressure calibration device, and the device can press the center of the grid with a pressing force of a specific strength according to a customer's requirement, and records a pressure signal after sensing a capacitance change through the pressure sensing module.

More specifically, step S2 specifically includes:

s21, setting each key of the product panel as a pressure test point;

and S22, acquiring data of all pressure test points in the pressure test result, and forming a corresponding linear function.

In this embodiment, the pressure characteristic points can be directly set according to the mechanical structure, the data in the pressure calibration device is derived, the function of each key relative to the pressure characteristic points is found out in a big data-and-sum mode, and the function is made into a data matrix for storage.

More specifically, step S4 specifically includes:

s41, converting all pressure characteristic points into pressure test points in an EOL process;

s42, acquiring a pressure threshold of each pressure test point;

and S43, calculating the actual pressure threshold value of the key according to the data matrix.

Preferably, in step S43, the actual pressure thresholds of all cases are calculated according to the data matrix, specifically, the actual pressure thresholds of all keys are obtained by automatic interpolation calculation according to the data matrix and the pressure thresholds of all pressure test points.

In this embodiment, the pressure characteristic points set in the test process are converted into EOL pressure calibration points, if M pressure characteristic points exist, M pressure test points are correspondingly generated in the EOL test process, the calibrated pressure thresholds of the M pressure test points are written into the controller through the data bus, and the controller automatically interpolates and calculates the pressure thresholds of all keys according to the M data and the original data matrix. EOL process software implementation: after the software enters a calibration mode and the calibration of the point to be tested is completed, data is written into a memory of the controller, the parameter updating is completed, and the calibration of the pressure threshold value is realized.

In summary, according to the method for detecting the pressure of the vehicle-mounted touch steering wheel based on the EOL consistency calibration provided by the embodiment, the pressure is sensed by converting the change of the force generation position into the change of the sensing capacitance, so that the cost can be greatly reduced, meanwhile, the consistency of a prototype is ensured by an EOL calibration algorithm, even a few calibrated characteristic points are adopted to calculate the global key pressure threshold, the calibration time is reduced, and the productivity is improved.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.