CN108501815A - A kind of anti-dazzle driving mirror system and control method - Google Patents

Abstract

The present invention proposes an anti-glare rearview mirror system and a control method. Two phototransistors at the front and rear of the rearview mirror are used to collect light intensity signals. Analyze and process the input signal, and then decide whether to output a voltage to the rearview mirror. When the output voltage is sent to the rearview mirror, according to the characteristic that the electrochromic glass can change color after being powered on, the lens of the rearview mirror can be changed. The light rate can weaken the reflectivity, and finally realize the anti-glare function. The invention can be applied to any specifications and types of electronic anti-dazzling automotive interior rearview mirrors, so as to achieve the required electronic anti-dazzling effect and ensure long-term normal service life.

Description

Anti-glare rearview mirror system and control method

technical field

The invention belongs to the technical field of vehicle rearview mirrors, in particular to an anti-glare rearview mirror system and a control method.

Background technique

When driving at night, because the headlights of the vehicle behind are reflected and shine into the eyes of the driver in front, this will dazzle the driver, which often affects traffic safety. Therefore, the anti-glare problem has become one of the important development directions of rearview mirror technology. The electronic anti-glare rearview mirror is made with electrochromic technology. "Electrochromic material" is a material that can change the light transmittance of the screen after electrification. It will adjust the reflectivity of the mirror according to the change of the surrounding light to achieve the anti-glare effect, and this rearview mirror can also maintain a high reflectivity under normal conditions, which is very useful when driving at night. Because the driver is driving at night, when the following vehicle is illuminated by strong light, the mirror can automatically adjust the reflectivity according to the change of light, which can effectively avoid the damage caused by glare.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-glare rearview mirror system and a control method for the above-mentioned existing problems, the control logic is simple, and the efficiency is relatively high.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an anti-glare rearview mirror system, which is characterized in that it includes a microcontroller, a rearview mirror, a front phototransistor, a rear phototransistor and a control circuit. The controller is a single-chip microcomputer, and the rearview mirror is electrochromic glass. The front and rear photosensitive transistors are respectively arranged on the front and rear ends of the rearview mirror. The single-chip microcomputer communicates with the rearview mirror, front photosensitive transistor, The rear phototransistor is connected with the vehicle gear controller.

Adopt the control method of a kind of anti-glare rearview mirror system described in claim 1, described single-chip microcomputer at first automatically judges whether the vehicle hangs the reverse gear, when being in the reverse gear, the voltage outputted by the single-chip microcomputer to the rearview mirror is zero, the rearview mirror cannot change the light transmittance because it is not powered on, and does not have the function of anti-glare. Collect three times respectively, and the single-chip microcomputer compares the collected light intensity signals. If the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer outputs zero voltage to the rearview mirror. The rearview mirror does not have the anti-glare function. When the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer compares the light intensity of the front phototransistor with the light intensity of the rear phototransistor. Whether the difference is less than zero, when the difference is less than zero, the single-chip microcomputer outputs a voltage to the rearview mirror, and after the rearview mirror is powered on, the light transmittance will be changed, realizing the anti-glare function.

The beneficial effect of the present invention is: provide a kind of anti-glare rearview mirror system and control method, compared with the photosensitive diode basically used in the traditional electronic anti-dazzling rearview mirror, the photosensitive triode has different spectral characteristics, has very Large photocurrent amplification has high sensitivity; for the problem that the existing rearview mirror is still working when reversing, causing the driver to lose the rear view, the circuit system designed by the present invention will The anti-glare function is automatically and temporarily turned off when the time is off, which improves the degree of automation; the single-chip microcomputer used as a microcontroller is relatively small in size, high in reliability, convenient and flexible, and powerful in function. The error value is used to judge the validity of the collected data, avoiding the interference problem existing in the line.

Description of drawings

FIG. 1 is a control flow diagram of an embodiment of the present invention.

Detailed ways

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

An anti-glare rearview mirror system includes a microcontroller, a rearview mirror, a front phototransistor, a rear phototransistor and a control circuit, the microcontroller is a single-chip microcomputer, the rearview mirror is electrochromic glass, and the front and rear phototransistors They are respectively arranged on the front and rear ends of the rearview mirror, and the single-chip microcomputer is connected with the rearview mirror, the front photosensitive transistor, the rear photosensitive transistor and the vehicle gear position controller through the control circuit.

As shown in Figure 1, when using this system, the single-chip microcomputer first automatically judges whether the vehicle is in the reverse gear. When it is in the reverse gear, the voltage output by the single-chip microcomputer to the rearview mirror is zero. Because the rearview mirror is not powered, The light transmittance cannot be changed, and it has no anti-glare function. When the vehicle is not in reverse gear, the single-chip microcomputer collects the light intensity signals from the front and rear phototransistors three times respectively, and the single-chip microcomputer collects the light intensity signals collected three times. Signals are compared, if the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer outputs zero voltage to the rearview mirror, and the rearview mirror does not have anti-glare function. When the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer compares whether the difference between the light intensity of the front photosensitive transistor and the light intensity of the rear photosensitive transistor is less than zero. At the same time, the single-chip microcomputer outputs voltage to the rearview mirror. After the rearview mirror is powered on, the light transmittance will be changed to realize the anti-glare function.

The electronic anti-glare rearview mirror is controlled based on a single-chip microcomputer, and two photosensitive transistors are installed. One of the two photosensitive transistors is installed on the front of the rearview mirror, and the other is installed on the back of the rearview mirror. They are mainly In order to collect the light intensity in front of and behind the car. Its working principle is that if the headlights of the vehicle following behind are turned on and shine on the rearview mirror in the car, the two photosensitive transistors will input the collected signals into the microcontroller, and then the microcontroller According to the preset program, the signals in the two photosensitive triodes can be compared, and it can automatically judge whether the light behind is stronger than the light in front. When the light difference between the two phototransistors exceeds a set standard glare, the microcontroller will automatically supply current to the rearview mirror at this time, and the rearview mirror will reduce the brightness after power-on. The effect of glare can be eliminated.

These changes produced by the automatic anti-glare rearview mirror are automatically completed under the control of the system in a very short period of time, and the driver basically cannot feel it.

The electronic anti-glare rearview mirror can have anti-glare function in most environments, but it also has a disadvantage, that is, when the vehicle backs out of the garage, due to the light behind the car in the garage Stronger, but the light in front of the car is relatively weak. If the automatic anti-glare function is used at this time, the rearview mirror will become dark, which will affect the driver's observation of the situation behind the car.

When the car starts the automatic anti-dazzling function, it will first judge whether it is in the reverse gear. If it is in the reverse gear, the anti-dazzling function will not be activated, and if it is not, it will enter the anti-dazzling process.

The above are only preferred embodiments of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still belong to the protection scope of the present invention.

Claims (2)

1. a kind of anti-glare rearview mirror system is characterized in that, comprises microcontroller, rearview mirror, front phototransistor, rear phototransistor and control circuit, described microcontroller is single-chip microcomputer, and described rearview mirror is Electrochromic glass, the front and rear phototransistors are respectively arranged on the front and rear ends of the rearview mirror, and the single-chip microcomputer is connected with the rearview mirror, the front phototransistor, the rear phototransistor and the vehicle gear controller through the control circuit . 2. adopt the control method of a kind of anti-glare rearview mirror system described in claim 1, it is characterized in that, at first described single-chip microcomputer automatically judges whether what vehicle hangs is the reverse gear, when being in the reverse gear, single-chip microcomputer gives The output voltage of the rearview mirror is zero. The rearview mirror cannot change the light transmittance because it is not energized, so it does not have the anti-glare function. signal, the two phototransistors collect three times respectively, and the single-chip microcomputer compares the collected light intensity signals. If the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer The output voltage is zero, and the rearview mirror does not have the anti-glare function. When the absolute value of the last two signal values minus the first signal value is less than the set error value, the single-chip microcomputer compares the light intensity of the front photosensitive transistor with the Whether the difference of the light intensity of the rear photosensitive transistor is less than zero, when the difference is less than zero, the single-chip microcomputer outputs a voltage to the rearview mirror, and after the rearview mirror is powered on, the light transmittance will be changed to realize the anti-glare function.