CN-116513049-B - Electronic outside rearview mirror visual field display adjusting method

CN116513049BCN 116513049 BCN116513049 BCN 116513049BCN-116513049-B

Abstract

The invention provides a visual field display adjusting method of an electronic exterior rearview mirror, which comprises the following steps of 1, obtaining the current front wheel steering angle of a trailer tractor; and 2, adjusting the display visual field range of the electronic exterior rearview mirror according to the current front wheel steering angle. The invention realizes the automatic adjustment of the visual field display of the electronic outside rearview mirror along with the steering of the tractor, and improves the driving safety.

Inventors

LU ZHIWEN
LI WENHUI

Assignees

惠州华阳通用电子有限公司

Dates

Publication Date: 20260505
Application Date: 20230518

Claims (4)

1. An electronic exterior mirror visual field display adjustment method is characterized by comprising the following steps: Step1, acquiring a current front wheel steering angle of a trailer tractor; step 2, adjusting the display visual field range of the electronic exterior rearview mirror according to the current front wheel steering angle; the step 2 comprises the following steps: step 201, acquiring corresponding preset vision field adjusting parameters according to the length of a current carriage, wherein the preset vision field adjusting parameters comprise an angle vision field relation, the number of large areas and the clipping amount of unit angle pixels in each large area; The calibration step of the angle visual field relation comprises the following steps: step 201a, calibrating the angle visual field relation between the steering angles of front wheels of tractors with different lengths and the visible horizontal visual field angle of a trailer, and storing; Step 201b, dividing the maximum front wheel steering angle of the tractor into unit angles according to the angle visual field relation, and dividing the first number of unit angles into one large area to obtain a second number of large areas; Step 201c, setting clipping amount of unit angle pixels in each large area; step 202, determining a cut target total pixel according to the current front wheel steering angle and a preset vision adjusting parameter, including: 202a, determining a target large area to which a current front wheel steering angle belongs according to an angle view relation; step 202b, determining a cut target total pixel according to the cut amount of the pixel of the unit angle of the large area of the target; the target large area is determined according to a second preset formula: Where j represents the number of the target large area, β represents the current front wheel steering angle, ω represents the maximum front wheel steering angle, m represents the number of large areas, Representing an upward rounding operation; The target total pixel is determined according to a third preset formula: Wherein P represents a target total pixel, n is the number of unit angles in each large area, and X k (k=i, j) represents the unit angle pixel clipping amount of the large area k; step 203, reading a view image, sequentially clipping the view image according to the number of pixels determined by a fourth preset formula until the clipped total pixel is the target total pixel, and refreshing the view image after clipping each time to a display device of the electronic outside rearview mirror; the fourth preset formula is: wherein p (i, s) represents the number of clipping pixels of the s-th small region in the large region i, i=1, 2, 3..j-1, s≤n, p (0, s) =0.
2. The method for adjusting the visual field display of the electronic outside mirror according to claim 1, wherein the step 1 comprises: Step 101, acquiring the rotation angle degree of a current steering wheel; step 102, determining the current front wheel steering angle according to the steering angle ratio of the steering wheel to the front wheels.
3. The electronic outside rear view mirror visual field display adjustment method according to claim 2, wherein the current front wheel steering angle is determined according to a first preset formula: β=round(α/γ) where β represents the current front wheel steering angle degree, α represents the current steering wheel angle degree, and round () represents the rounding operation.
4. The method for adjusting the visual field display of the electronic outside mirror according to claim 1, wherein the clipping amount of the pixels per unit angle in each of the large areas is sequentially increased.

Description

Electronic outside rearview mirror visual field display adjusting method Technical Field The invention relates to the technical field of electronic exterior rearview mirrors, in particular to a visual field display adjusting method of an electronic exterior rearview mirror. Background At present, the external rearview mirror of a vehicle is generally a traditional physical rearview mirror, and mirror surface follow-up adjustment during turning of the vehicle cannot be realized, so that a driver cannot see the view of the tail area of the vehicle through the external rearview mirror during turning, a view blind area is formed, driving safety is affected, and particularly, the external rearview mirror is particularly suitable for trucks or buses with longer whole vehicle length. With the development of electronic technology, the class II electronic rearview mirror allows an external rearview mirror as an external rearview mirror for observing the external rearview field of a vehicle, and is mainly used for observing the condition of the vehicle behind through the rearview mirror while turning on a turn signal lamp when the vehicle is required to change lanes, and confirming the safe back lane change. However, the current class II electronic rearview mirror still has a large potential safety hazard and a limited view due to the oversized vehicle body or container shielding the rear view outside the vehicle during steering. Disclosure of Invention The invention provides a visual field display adjusting method of an electronic exterior rearview mirror, which aims to solve the defects in the prior art, realize automatic adjustment of visual field display of the electronic exterior rearview mirror along with steering of a tractor and improve driving safety. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A visual field display adjusting method of an electronic exterior rearview mirror comprises the following steps: Step1, acquiring a current front wheel steering angle of a trailer tractor; and 2, adjusting the display visual field range of the electronic exterior rearview mirror according to the current front wheel steering angle. Specifically, the step 1 includes: Step 101, acquiring the rotation angle degree of a current steering wheel; step 102, determining the current front wheel steering angle according to the steering angle ratio of the steering wheel to the front wheels. Specifically, the current front wheel steering angle is determined according to a first preset formula: β=round(α/γ) where β represents the current front wheel steering angle degree, α represents the current steering wheel angle degree, and round () represents the rounding operation. Specifically, the step 2 includes: step 201, acquiring corresponding preset vision field adjusting parameters according to the length of a current carriage, wherein the preset vision field adjusting parameters comprise an angle vision field relation, the number of large areas and the clipping amount of unit angle pixels in each large area; step 202, determining a cut target total pixel according to the current front wheel steering angle and a preset vision adjusting parameter; And 203, reading a view image, sequentially clipping the view image according to the number of pixels determined by a fourth preset formula until the clipped total pixel is the target total pixel, and refreshing the view image after clipping each time to a display device of the electronic outside rearview mirror. Specifically, the calibrating step of the angular visual field relation comprises the following steps: step 201a, calibrating the angle visual field relation between the steering angles of front wheels of tractors with different lengths and the visible horizontal visual field angle of a trailer, and storing; Step 201b, dividing the maximum front wheel steering angle of the tractor into unit angles according to the angle visual field relation, and dividing the first number of unit angles into one large area to obtain a second number of large areas; Step 201c, setting clipping amount of unit angle pixels in each large area. Specifically, the clipping amount of the unit angle pixels in each large area is sequentially increased. Specifically, the step 202 includes: 202a, determining a target large area to which a current front wheel steering angle belongs according to an angle view relation; step 202b, determining the cut target total pixels according to the cut amount of the target large area and the unit angle pixels. Specifically, the target large area is determined according to a second preset formula: Where beta represents the current front wheel steering angle, ω represents the maximum front wheel steering angle, m represents the number of large areas, Representing a rounding up operation. Specifically, the target total pixel is determined according to a third preset formula: Where P represents the target total pixel and X k (