阅读说明：本技术 一种底盘操纵稳定性转向中心区试验的数据处理方法 (Data processing method for chassis control stability steering center area test ) 是由 王佳伟 王彬 张雷 王蕾 具龙锡 尹红斌 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种底盘操纵稳定性转向中心区试验的数据处理方法,属于汽车试验技术领域,通过数采设备获取试验原始数据；将所述试验原始数据通过数据滤波器得到去噪试验数据；通过所述去噪试验数据得到转向中心区位置的数据梯度和滞回曲线上下两条曲线的梯度。本发明提供了一种底盘操纵稳定性转向中心区试验的数据处理方法,通过数据滤波器将将高频噪音数据进行过滤,通过多次试验得到最终转向中心区位置的数据梯度和最终滞回曲线上下两条曲线的梯度,从而减少测量误差带来的信息损耗。(The invention discloses a data processing method for a chassis control stability steering center area test, which belongs to the technical field of automobile tests and comprises the steps of obtaining original test data through data acquisition equipment; the test original data are processed through a data filter to obtain de-noising test data; and obtaining the data gradient of the steering central area position and the gradients of the upper curve and the lower curve of the hysteresis curve through the denoising test data. The invention provides a data processing method for a chassis steering stability steering center area test, which is characterized in that high-frequency noise data are filtered through a data filter, and a data gradient of a final steering center area position and gradients of an upper curve and a lower curve of a final hysteresis curve are obtained through multiple tests, so that information loss caused by measurement errors is reduced.)

1. A data processing method for chassis steering stability steering center area test is characterized by comprising the following steps:

step S10, acquiring original test data through data acquisition equipment;

step S20, enabling the test original data to pass through a data filter to obtain de-noising test data;

and step S30, obtaining the data gradient of the steering central area position and the gradients of the upper curve and the lower curve of the hysteresis curve through the denoising test data.

2. The data processing method for the chassis steering stability turning center area test according to claim 1, further comprising:

and S40, repeating the steps S10-30, respectively obtaining the data gradients of a plurality of turning central area positions and the gradients of the upper curves and the lower curves of a plurality of hysteresis curves, and obtaining the data gradient of the final turning central area position and the gradients of the upper curves and the lower curves of the final hysteresis curves through the data gradients of the turning central area positions and the gradients of the upper curves and the lower curves of the hysteresis curves.

Technical Field

The invention discloses a data processing method for a chassis steering stability steering center area test, and belongs to the technical field of automobile tests.

Background

At present, in the process of developing the steering stability of a vehicle, a steering center area test is usually carried out by referring to the standard GB/T6323-2014, and the test requires that a gyroscope is applied for testing and a data acquisition device is used for outputting physical signals such as a steering wheel corner, a steering wheel moment, a vehicle yaw rate, a vehicle lateral acceleration and the like. Under the influence of instruments and sensors, the direct output of data has the phenomena of noise, burrs and the like, and the accuracy of objective indexes is seriously influenced.

Disclosure of Invention

The invention aims to solve the problem that the accuracy of the test data of the chassis operation stability steering center area is poor at present, and provides a data processing method for the chassis operation stability steering center area test.

The purpose of the invention is realized by the following technical scheme:

a data processing method for chassis steering stability steering center area test comprises the following steps:

step S10, acquiring original test data through data acquisition equipment;

step S20, enabling the test original data to pass through a data filter to obtain de-noising test data;

and step S30, obtaining the data gradient of the steering central area position and the gradients of the upper curve and the lower curve of the hysteresis curve through the denoising test data.

Preferably, the method further comprises the following steps:

and S40, repeating the steps S10-30, respectively obtaining the data gradients of a plurality of turning central area positions and the gradients of the upper curves and the lower curves of a plurality of hysteresis curves, and obtaining the data gradient of the final turning central area position and the gradients of the upper curves and the lower curves of the final hysteresis curves through the data gradients of the turning central area positions and the gradients of the upper curves and the lower curves of the hysteresis curves.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a data processing method for a chassis steering stability steering center area test, which is characterized in that high-frequency noise data are filtered through a data filter, and a data gradient of a final steering center area position and gradients of an upper curve and a lower curve of a final hysteresis curve are obtained through multiple tests, so that information loss caused by measurement errors is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a graph of filtered steering wheel torque versus steering wheel angle in accordance with the present invention.

FIG. 2 is a graph of the filtered steering wheel torque versus steering wheel angle of the present invention with an extracted center area curve.

FIG. 3 is a final curve diagram of a center curve extracted from the relationship between the filtered steering wheel torque and the steering wheel angle.

Detailed Description

The invention is further illustrated below with reference to the accompanying figures 1-3:

the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a first embodiment of the present invention provides a data processing method for a chassis steering stability steering center area test based on the prior art, including:

and step S10, acquiring test original data through data acquisition equipment.

And step S20, passing the test original data through a data filter to obtain de-noising test data.

The data signal output by the data acquisition equipment contains a large amount of high-frequency noise data, and the high-frequency noise data can be filtered. Digital filtering may be achieved by adding data filters that amplify signals at certain frequencies (bands) of the signal and reject signals at other frequencies (bands). The filter can be divided into low-pass, high-pass, band-stop, all-pass, etc. according to the amplitude-frequency characteristics of the filter. The filter can be designed by self-trying, and the common existing filter can also be used for reference. Through practical inspection, the low-pass Butterworth filter can better filter data.

The system transfer function of the low-pass filter is shown as above, taking a relation curve of the steering wheel torque and the steering wheel rotation angle as an example, and after filtering, the system transfer function is shown in fig. 1, where SWT is the steering wheel torque and SWA is the steering wheel rotation angle. Therefore, the low-pass filter can well eliminate high-frequency noise to obtain a smooth and real curve.

And step S30, obtaining the data gradient of the steering central area position and the gradients of the upper curve and the lower curve of the hysteresis curve through the denoising test data.

In actual data processing, in addition to the measured curve, the engineer is also interested in the gradient of the data at the position of the turning center, and the gradients of the upper curve and the lower curve of the hysteresis curve need to be extracted. Therefore, the data of interest needs to be intercepted.

In the data processing, the data of the middle area is intercepted only by writing a judgment program, judging the position of the current data point from the central point, if the distance is less than the distance of the target interval, the data is reserved, and if the distance is more than the distance of the target interval, the data is rejected.

Meanwhile, in order to extract the upper/lower curves respectively, it is necessary to determine whether the current data point is located in the upper curve or the lower curve. A determination may be made from the time series corresponding to the data points that the steering wheel angle increases with time as a lower curve and the steering wheel angle decreases with time as an upper curve. The judgment program is written according to the rule, and as shown in fig. 2, the thick line is the extracted curve of the central area.

And S40, repeating the steps S10-30, respectively obtaining a plurality of data gradients at the position of the steering central area and gradients of upper and lower two curves of a plurality of hysteresis curves, and obtaining the data gradient at the final position of the steering central area and the gradients of the upper and lower two curves of the hysteresis curves through the data gradients at the position of the steering central area and the gradients of the upper and lower two curves of the hysteresis curves so as to reduce information loss caused by measurement errors. The data of each time can be averaged after the data is intercepted by a writing program, as shown in fig. 3, the thick line is the curve of the central area after the averaging of multiple times of experiments.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.