CN101402331A - Intelligent follow-up illumination method of car lamp - Google Patents

Abstract

The invention relates to a method for intelligent follow-up lighting of vehicle lamps, which adopts a follow-up lighting device including a sensor component, an electronic control unit, a transmission line, and an actuator, and uses a speed sensor, an incremental photoelectric encoder, a gear signal sensor, The sensor components including the centripetal force sensor detect the vehicle speed, steering wheel angle and centripetal force in real time; the electronic control unit adopts a high-speed 32-bit digital signal processor, according to the received steering wheel angle signal, driving speed signal, gear signal, Motor angle feedback signal, using the curve mathematical model to calculate the turning radius, calculating the horizontal angle of the stepper motor according to the formula, and automatically adjusting the lighting angle of the headlight to the inner side of the road curve; the positive effect of the present invention is: a high degree of intelligence, It can enhance the vision of the driver when driving at night and encounter a curve, improve the judgment, and reduce the occurrence of accidents.

Description

A method for intelligent follow-up lighting of vehicle lights

【Technical field】

The present invention relates to the technical field of automobile manufacturing and automobile electronic accessories, especially the technical field of providing intelligent lighting for automobiles and motorcycles, and specifically refers to a method for intelligent follow-up lighting of vehicle lights controlled by a digital signal processor (DSP) .

【Background technique】

The dynamic follow-up dimming of the lights on the curve is mainly to provide lighting for the dark area of the curve when the vehicle is turning at night, so as to enhance the driver's observation of the curve and improve the convenience and safety of night driving.

What current prior art adopted on hardware is mechanical transmission structure, adopts speed sensor and steering wheel angle sensor, controls the horizontal rotation of automobile headlight by the transmission structure of worm gear plus DC motor. Due to the complex structure of the mechanical transmission, the reliability is low; the control precision of the DC motor as the driving motor is low, and the response speed of the system is slow; the traditional steering wheel angle sensor uses a sliding rheostat to detect the rotation of the steering wheel, and the accuracy is poor; therefore, the existing The technical device is not only complex in structure, but also slow in execution speed and low in precision when adjusting.

In terms of control methods, the number of sensors installed in the existing technology is small, and the basis for judging the turning radius is single. Only the vehicle speed and steering wheel angle are used as the main basis for judging the turning radius, which cannot meet the high reliability of dynamic follow-up dimming of car lights on curves. sexual demands.

【Content of invention】

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for intelligent follow-up lighting of car lights to solve the problem of insufficient sightlines when driving on a curve. The headlights turn according to the direction of the curve, thereby improving the convenience and safety of driving at night.

For realizing above-mentioned object, the technical scheme that the present invention takes is:

A method for intelligent follow-up lighting of vehicle lamps, using a follow-up lighting device including a sensor component, an electronic control unit, a transmission line, and an actuator, and including a speed sensor, an incremental photoelectric encoder, a gear signal sensor, and a centripetal force sensor. The sensor components inside detect the speed of the vehicle, the angle of rotation of the steering wheel and the centripetal force in real time, and transmit the data link to the electronic control unit through the transmission line; the electronic control unit adopts a high-speed 32-bit digital signal processor, Corner signal, driving speed signal, gear signal, centripetal force signal and motor corner feedback signal, use two curve mathematical models to calculate the turning radius, calculate the horizontal corner of the stepping motor according to the mathematical formula, and automatically adjust the lighting angle of the headlights to Inside the road curve.

The formula (1) of the curve mathematical model is: R=(1+AV ² )×(L/δ)

Among them: R is the turning radius, A is the stability factor, V is the vehicle speed, L is the distance between the front and rear wheel axles, and δ is the angle of the front wheel steering wheel.

The formula (2) of the curve mathematical model is: R=V ² /g

Among them: R is the turning radius, V is the vehicle speed, and g is the centripetal force.

The mathematical formula for calculating the horizontal angle of rotation of the stepper motor is: ω=(180/∏)×(Vt/2R)

Among them: ω is the rotation angle of the stepping motor, V is the speed of the vehicle, t is the time, generally takes 3 seconds, and finally the angle of the lamp is determined by the rotation angle ω.

The pulse width modulation signal (PWM) output by the digital signal processor controls the stepper motor subdivision driver to drive the stepper motor to do horizontal rotation, and the stepper motor shaft is connected with a Hall position sensor, which detects the The rotational position of the rotating shaft is fed back to the digital signal processor, thereby realizing the closed-loop control of the servo system.

The actuator includes a stepping motor subdivision driver, a stepping motor, and a headlight.

The positive effects of a method for intelligent follow-up lighting of vehicle lamps in the present invention are:

(1) The high-speed 32-bit digital signal processor TMS320LF2812 is used to replace the 8/16-bit MCU in the prior art, so that the equipment can meet the real-time requirements of the follow-up lighting device.

(2) Two mathematical models are used in the software to calculate the turning radius respectively, and then take their average value, which improves the accuracy of turning radius calculation.

(3) Make full use of the existing electronic components, use the curve mathematical model and mathematical formula to calculate the turning radius and the horizontal angle of the stepping motor, the degree of intelligence is higher, and the lighting angle of the headlight can be better automatically adjusted.

(4) The commercialization of this method can solve the problem of effective illumination of the dark area of the curve when driving at night when the vehicle is turning, so that the driver's line of sight is enhanced when driving at night and encounters a curve, the judgment is improved, and the occurrence of accidents can be reduced.

【Description of drawings】

Accompanying drawing 1 is a system structural block diagram of the method for intelligent follow-up lighting of a vehicle lamp of the present invention;

Accompanying drawing 2 is a working flow diagram of a method for intelligent follow-up lighting of vehicle lights according to the present invention.

【Detailed ways】

A specific implementation of a method for intelligent follow-up lighting of vehicle lamps according to the present invention is given below in conjunction with the accompanying drawings, however, the present invention is not limited to the embodiments described below.

See attached drawing 1.

A method for intelligent follow-up lighting of car lights, using a follow-up lighting device including sensor components, an electronic control unit, a transmission line, and an actuator, the actuator includes a stepping motor subdivision driver, a stepping motor, and a headlight. The sensor components including speed sensor, incremental photoelectric encoder, gear signal sensor and centripetal force sensor detect the speed of the vehicle, the angle of rotation of the steering wheel and centripetal force in real time, and transmit the data link to the electronic control through the transmission line (CAN bus) Unit; the electronic control unit adopts a high-speed 32-bit digital signal processor, and the pulse width modulation signal (PWM) output by the digital signal processor controls the subdivision driver of the stepping motor to drive the stepping motor to do horizontal rotation, and the shaft of the stepping motor is connected with Hall position sensor, which feeds back the detected rotational position of the stepping motor shaft to the digital signal processor, so as to realize the closed-loop control of the servo system; , gear signal, centripetal force signal and motor angle feedback signal, use the curve mathematical model formula (1) and formula (2) to calculate the turning radius:

Formula (1) is: R=(1+AV ² )×(L/δ)

Among them: R is the turning radius, A is the stability factor, V is the vehicle speed, L is the distance between the front and rear wheel axles, and δ is the angle of the front wheel steering wheel;

Formula (2) is: R=V ² /g

Among them: R is the turning radius, V is the speed of the vehicle, and g is the centripetal force;

Calculate the horizontal angle of rotation of the stepper motor according to the mathematical formula (3) and the feedback signal of the gear signal and the rotation of the stepper motor shaft,

Formula (3) is: ω=(180/∏)×(Vt/2R)

Among them: ω is the rotation angle of the stepping motor, V is the vehicle speed, t is the time, generally takes 3 seconds, and finally the angle of the lamp is determined by the rotation angle ω;

Automatically adjust the lighting angle of the headlights to the inside of the road curve.

See attached drawing 2.

In the method for intelligent follow-up lighting of vehicle lamps according to the present invention, the working range of the horizontal rotation angle of the motor of the follow-up lighting device depends on the vehicle speed and the radius of the curve, and the range of the rotation angle of the motor also has a limit. Firstly, the digital signal processor is based on the value of the sensor; secondly, the radius of the curve is calculated using formula (1) and formula (2). When the radius of the curve is less than 25 meters, the motor of the follow-up lighting device does not operate and continues to read the sensor When the radius of the curve is greater than 25 meters, calculate the rotation angle of the motor according to the formula (3); again, if the vehicle speed is within the range of 10-100 km/h, then judge whether the rotation angle of the motor is 4°<| For the range of ω|<19°, if it is, then output the control value of the stepper motor, if not, return to continue reading the sensor value. Repeatedly.

Claims (6)

1. A method for intelligent follow-up lighting of vehicle lights, using a follow-up lighting device including a sensor component, an electronic control unit, a transmission line, and an actuator, including a speed sensor, an incremental photoelectric encoder, a gear signal sensor, The sensor components including the centripetal force sensor detect the speed of the vehicle, the angle of rotation of the steering wheel and the centripetal force in real time, and transmit the data link to the electronic control unit through the transmission line; the electronic control unit uses a high-speed 32-bit digital signal processor, according to the Steering wheel angle signal, driving speed signal, gear signal, centripetal force signal and motor angle feedback signal, use two curve mathematical models to calculate the turning radius, calculate the horizontal angle of the stepper motor according to the mathematical formula, and automatically adjust the lighting angle of the headlights Adjust to the inside of road curves. 2. The method for intelligent follow-up lighting of vehicle lights according to claim 1, characterized in that the formula (1) of the mathematical model of the curve is: R=(1+AV ² )×(L/δ), Among them: R is the turning radius, A is the stability factor, V is the vehicle speed, L is the distance between the front and rear wheel axles, and δ is the angle of the front wheel steering wheel. 3. The method for intelligent follow-up lighting of vehicle lights according to claim 1, characterized in that the formula (2) of the mathematical model of the curve is: R=V ² /g, wherein: R is the turning radius, V is the vehicle speed, and g is the centripetal force. 4. The method for intelligent follow-up lighting of vehicle lights according to claim 1, characterized in that the mathematical formula for calculating the horizontal rotation angle of the stepping motor is: ω=(180/∏)×(Vt/2R), where : ω is the rotation angle of the stepping motor, V is the speed of the vehicle, t is the time, usually 3 seconds, and finally the angle of the lamp is determined by the rotation angle ω. 5. The method for intelligent follow-up lighting of vehicle lights according to claim 1, characterized in that, the pulse width modulation signal (PWM) output by the digital signal processor controls the stepper motor subdivision driver to drive the stepper motor to do horizontal For rotation, a Hall position sensor is connected to the shaft of the stepping motor, which feeds back the detected rotational position of the shaft of the stepping motor to the digital signal processor, thereby realizing the closed-loop control of the servo system. 6. The method for intelligent follow-up lighting of vehicle lamps according to claim 1, characterized in that the actuator includes a stepping motor subdivision driver, a stepping motor, and a headlight.

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