CN201824942U - Automobile intelligent head lamp system simulating preview behavior of driver - Google Patents

Abstract

The utility model relates to an automobile head lamp system simulating the foresight preview behavior of a driver. The adopted technical scheme is as follows: an automobile longitudinal acceleration signal and an automobile side acceleration signal are obtained through a sensor, so as to build a curvilinear integral algorithm in combination with the movement characteristic parameter for estimating the driving track of an automobile in the future and calculating the road position concerned by the driver at present, namely the area required to be lightened, thereby obtaining the rotating angle of the head lamp in the horizontal direction. A driving motor can be used for receiving a rotational angle signal and controlling the rotation of the head lamp in the horizontal direction. The lighting area of the head lamp can be controlled through the automobile head lamp system reasonably, thereby ensuring that the main road area concerned by the driver during driving at night can be always lightened fully, providing full reaction time for treating the emergency caused in front of the road, reducing the stress level of the driver and having important meaning to the driving safety at night.

Description

Imitative chaufeur is taken aim at the intelligent vehicle head lamp system of behavior in advance

Technical field:

The utility model relates to a kind of intelligent vehicle head lamp system, particularly relates to by the current state of kinematic motion of automobile estimating the vehicle desired location, and promptly the car headlamp system that corresponding head lamp horizontally rotates angle is calculated in the zone of taking aim in advance of chaufeur.

Background technology:

The Lighting System of automobile plays crucial effects to safety traffic.In the process of automobile night running, the main direction of illumination of traditional head lamp is changeless for car body, can't change along with the variation of road or weather conditions.Through road conditions such as the more country road in fork in the road, bend, cross roadss the time, chaufeur can not in time be found the danger that road the place ahead is potential, the as easy as rolling off a log generation that causes traffic accident.In order to improve the night travel safety, the car headlamp system is in development constantly.Up to now, from initial filament lamp, develop into halide torch, free form surface head lamp and projection system head lamp.The gas discharge lamp system that brightness is higher, the light area is bigger has appearred in last century end especially, has greatly improved the ability of night light.In order to pursue safer night travel condition, people constantly explore intelligence more, more can adapt to the head lamp system of road condition change.In addition, also and disunity about the rules of head lamp system.Mainly be divided into European standard and USSt at present.Mainly there is bigger difference in the two on the dipped beam luminous intensity distribution.The special control of paying attention to dazzle of European standard, so dipped beam distributes and goes up the "cut-off"lines that have 15 degree, this dead line effect can prevent the dazzle to oncoming vehicle effectively.Yet in the U.S., road is broader mostly, therefore dazzle is not had special requirement.But along with the quickening of economic globalization process, the difference between this standard is eliminated in people's an urgent demand, sets up a unified international standard.A kind of method is to form the standard that both sides can both accept, so-called international coordination that Here it is with reasonably partly integrating in two kinds of standards.Another method is exactly to set up a head lamp system that comprises multiple function, and it can take different lighting systems according to different road conditions.

In order to solve the problem of above-mentioned traffic safety and rules aspect, people have proposed self-adaptive headlamp system (AFS) in 2003, this system can be according to car behaviour information, lighting system to head lamp is carried out the self adaptation adjustment, the illumination of better bend is provided and has solved problems such as dazzle, greatly improved the night travel safety head-on sending a car.Realize on automobile that at present the AFS system that uses is made up of following three parts usually: information perception unit, Central Processing Unit (CPU) and driving performance element.Information perception unit comprises various sensors such as steering wheel angle sensor, yaw-rate sensor and height sensor etc.The information that the Central Processing Unit (CPU) receiving sensor collects, by built-in calculated with mathematical model car light up and down or about the anglec of rotation, the rotation by the step motor control head lamp in the driving control unit at last.Installing after this system can be so that chaufeur can be seen the actual road conditions in the place ahead clearly, and then has adequate time to meet emergencies, and reduces driver fatigue degree and tensity, the safety that obviously improves night travel.In addition,, also humidity sensor, Light indicator etc. to be installed, make it, also can reach best illuminating effect overcast and rainy the grade under the rugged environment of greasy weather if will make head lamp can adjust the variation of light type according to the variation of environment.Accompanying drawing 2 has been showed the illuminating effect of AFS system.As can be seen, the AFS system opens that illuminating effect has obtained tangible improvement when not opening.

Though existing AFS system has greatly improved night light; but to the control of head lamp usually based on the state of kinematic motion of automobile current time; or link with the rotation of bearing circle, automobile expection driving trace is not estimated or the actual driving intention of chaufeur is judged.So, the improvement of existing intelligent head lamp system is still waiting to carry out.

Summary of the invention:

The purpose of this utility model provides the intelligent vehicle head lamp system that a kind of imitative chaufeur is taken aim at behavior in advance, when automobile negotiation of bends at night, can control head lamp and rotate corresponding angle in the horizontal direction.Consult shown in Figure 2, this system is installed after, can provide the illumination of sufficient bend, the safety that has improved night travel effectively for chaufeur.

Above-mentioned purpose of the present utility model can be achieved through the following technical solutions:

A kind of imitative chaufeur is taken aim at the car headlamp system of behavior in advance, this system comprises the information perception unit by groups of acceleration sensors one-tenth, built-in imitative chaufeur is taken aim at the Central Processing Unit (CPU) of head lamp corner calculation procedure of behavior and the driving performance element of being made up of stepping motor in advance, wherein vertically and lateral acceleration sensor acquisition vehicle behaviour information, be transferred to Central Processing Unit (CPU) by the signal transmission network in the car, after Central Processing Unit (CPU) calculates the anglec of rotation of head lamp, angle signal is transferred to the stepping motor that drives in the performance element, and the control motor carries out corresponding action.

Described acceleration pick-up is used for measuring vehicle vertically and the acceleration change of side direction.

Described Central Processing Unit (CPU) is used for the acceleration signal according to vertical and lateral acceleration sensor acquisition, and the head lamp offset angle calculated with mathematical model of taking aim at behavior by built-in imitative chaufeur in advance goes out the angle that the head lamp horizontal direction should be rotated.

Further specify the technical solution of the utility model below in conjunction with accompanying drawing, native system comprises three basic modules: information sensing module one promptly is installed in the sensor on the automobile.The Central Processing Unit (CPU) of head lamp drive control module and built-in corner computational mathematics model.Its feature also is to be installed in acceleration pick-up on the automobile and is used for the lateral acceleration and the longitudinal acceleration of measured automobiles.Sensor and Central Processing Unit (CPU) link together, and give control module with the vehicle behaviour information transfer.And Central Processing Unit (CPU) is transferred to the stepping motor that drives in the performance element with the angular signal that calculates, and the control head lamp rotates accordingly.

Wherein, write the corner calculation procedure that imitative chaufeur is taken aim at behavior in advance in the Central Processing Unit (CPU).It is characterized in that: take aim at behavior in advance by the forward sight of drive simulating person the time,, estimate traval trace, calculate head lamp horizontal direction offset angle, consult shown in Figure 3 with reference to car status information by the deep camber bend.

The forward sight of so-called chaufeur is taken aim at behavior in advance, be exactly chaufeur according to actual driving experience, in driving procedure,, can forwards observe the condition of road surface in the certain limit usually in order the current motion of Control of Automobile to make automobile reach desired location.Simultaneously according to own understanding and grasp, utilize the steady state response of the current state of automobile and automobile to estimate the expection driving trace of automobile to automobile dynamic quality and kinematics characteristic.The specific implementation method is as follows: owing to need to calculate through taking aim at the level angle of vehicle behaviour and head lamp behind the time T p in advance, a coordinate of then picking up the car is a reference frame, therefore at t lengthwise position x constantly ₀Horizontal position y ₀And yaw angle

Be zero, and be by the longitudinal acceleration steady-state value vertical and the current time t that the lateral acceleration sensor records that is installed on the automobile The transverse acceleration steady-state value is Because the transient response time of automobile is very little with respect to the forward sight time, therefore can think automobile when t, be carved into t+Tp constantly during this period of time in move according to steady state characteristic, (be generally 1～2s) in forward sight in time, can think that the vertical and lateral acceleration of automobile is a unmodified, the speed control characteristic of automobile and direction controller characteristic curve are similar to a first-order linear reference model.By vehicle condition and the location parameter that obtains, just can estimate at one section expection form track of taking aim in advance in the time T p in future automobile.Thereby the angle that can obtain between vehicle desired location and the longitudinal direction of car axis is that corresponding head lamp horizontally rotates angle.

As the above analysis, compare with existing AFS system control strategy, the utility model can be obtained better control effect: traditional control method is only controlled head lamp according to current car behaviour information, the driving intention of chaufeur is not judged.The utility model is by to the estimating of the following driving trace of vehicle, and determines to take aim at the zone in advance when chaufeur is driven, and the control head lamp makes it rotate to best lighting position, satisfies the needs of chaufeur to illumination to greatest extent.

Description of drawings:

Fig. 1 takes aim at the AFS system module sketch of behavior in advance for imitative chaufeur;

Fig. 2 is assembling AFS front and back bend illuminating effect comparison diagram at night;

Fig. 3 sets up scheme drawing for head lamp level angle math modeling.

Among the figure: 1. passing light 2. is vertically heightened stepping motor 3. and is horizontally rotated 6. head lamp irradiation areas behind the unassembled AFS 5. assembling AFS of stepping motor 4.

The specific embodiment:

Knot and accompanying drawing illustrated embodiment further specify particular content of the present utility model and embodiment thereof below:

Figure 1 shows that intelligent vehicle head lamp system constructional drawing described in the utility model.Comprise: measured automobiles vertically and the sensor of lateral acceleration, the Central Processing Unit (CPU) of built-in corner computational mathematics model and head lamp drive control module.The mouth of acceleration pick-up is connected with the Central Processing Unit (CPU) input end, and the mouth of Central Processing Unit (CPU) and drive control module link together.

Wherein acceleration pick-up is used for measured automobiles in acceleration change vertical and that measure, and the acceleration signal that measures is used to calculate the level angle of head lamp.In Central Processing Unit (CPU), write imitative chaufeur and taken aim at the control algorithm of the head lamp corner of behavior in advance.Control algorithm is made judgement in conjunction with the current state of kinematic motion of automobile to the automobile expectation path, thereby draws more reasonably head lamp angular control signal.The effect that drives performance element is to receive the rotation angle information that Central Processing Unit (CPU) sends, and rotates in the horizontal direction by the step motor control head lamp, is implemented in the adjusting of bend place to direction of illumination.

In order more clearly to set forth the principle of head lamp control in the utility model, the calculating to the head lamp level angle is described further below:

The basic thought of method of calculating is as follows: take aim at behavior in advance by the forward sight of drive simulating person by the deep camber bend time, the car status information that reference sensor collects utilizes vehicle steady state response characteristic that the expection driving trace of automobile after following a period of time estimated.Consider the influence of weaving simultaneously to course angle, set up automobile expected trajectory curvilinear integral algorithm, calculate through taking aim at the relative position that automobile reached after the time in advance, thereby to obtain with respect to the deflection angle of automobile longitudinal axis be the angle that horizontally rotates of self adaptation car light.

The forward sight of so-called chaufeur is taken aim at behavior in advance; be exactly that chaufeur is according to actual driving experience; in driving procedure; usually can forwards observe the condition of road surface in the certain limit; and according to own understanding and grasp to automobile dynamic quality and kinematics characteristic; utilize the steady state response of the current state of automobile and automobile to estimate the expection driving trace of automobile, thereby the current motion of Control of Automobile make automobile reach the position that chaufeur is taken aim in advance.

Specific implementation method to driving trace predicating is as follows: owing to need to calculate through taking aim at the level angle of vehicle behaviour and head lamp behind the time T p in advance, a coordinate of then picking up the car is a reference frame, therefore at t lengthwise position x constantly ₀Horizontal position y ₀And yaw angle Be zero, and be by the longitudinal acceleration steady-state value vertical and the current time t that the lateral acceleration sensor records that is installed on the automobile

The transverse acceleration steady-state value is

Because the transient response time of automobile is very little with respect to the forward sight time, therefore can think automobile when t, be carved into t+Tp constantly during this period of time in move according to steady state characteristic, (be generally 1～2s) in forward sight in time, can think that the vertical and lateral acceleration of automobile is a unmodified, the speed control characteristic of automobile and direction controller characteristic curve are similar to a first-order linear reference model.By vehicle condition and the location parameter that obtains, and the forward sight of drive simulating person in startup procedure take aim at effect in advance, just can estimate at one section expection driving trace of taking aim in advance in the time T p in future automobile.

Concrete method of calculating is as follows: from the angle that automobile sport is learned, automobile can be thought to be determined by vertical, the transverse acceleration of current state of kinematic motion of automobile and automobile at following t+Tp moment institute's zone of reach.Therefore, can be according to the following state of kinematic motion of t+Tp constantly of the status predication of current time t automobile

Forward sight time T p is divided into impartial discrete time section, in each time period, because the time is very short, uses the rigid body kinematics principle to calculate the state of vehicle, progressively adding up then obtains the t+Tp state of vehicle constantly.Since the influence of Vehicular yaw motion, the course angle of vehicle between adjacent two moment Variation has taken place, so bodywork reference frame is different in the different time periods.But vehicle condition all is to calculate under the vehicle axis system of previous moment, therefore must carry out coordinate transform, it is transformed into initial coordinate system from different bodywork reference frames just can adds up down, obtains the vehicle-state in this moment.In the process of calculating t+Tp moment vehicle-state, be benchmark with t moment vehicle coordinate all the time, from system of axes (x _j, y _j) to system of axes (x ₀, y ₀) transition matrix be:

Thereby automobile is obtained by following column count at the state of expected trajectory point Pj

$\left[\begin{array}{c}{\stackrel{\·\·}{x}}_j\\ {\stackrel{\·\·}{y}}_j\end{array}\right]=\left[\begin{array}{c}{\stackrel{\·\·}{x}}_0\\ {\stackrel{\·\·}{y}}_0\end{array}\right],$

$\left[\begin{array}{c}{\stackrel{\·}{x}}_j\\ {\stackrel{\·}{y}}_j\end{array}\right]=\left[\begin{array}{c}{\stackrel{\·}{x}}_{j-1}\\ {\stackrel{\·}{y}}_{j-1}\end{array}\right]+\left[\begin{array}{c}{\stackrel{\·\·}{x}}_j\\ {\stackrel{\·\·}{y}}_j\end{array}\right]\×\mathrm{\Δtp},$

$\left[\begin{array}{c}{x}_j\\ y_j\end{array}\right]=\left[\begin{array}{c}{x}_{j-1}\\ y_{j-1}\end{array}\right]+A_{j-\mathrm{1,0}}(\left[\begin{array}{c}{\stackrel{\·}{x}}_{j-1}\\ {\stackrel{\·}{y}}_{j-1}\end{array}\right]\×\mathrm{\Δtp}+\frac{1}{2}\left[\begin{array}{c}{\stackrel{\·\·}{x}}_j\\ {\stackrel{\·\·}{y}}_j\end{array}\right]\×\mathrm{\Δ}{\mathrm{tp}}^2),$

J=1 in the formula, 2 ... Z, J (J such as is at the number of time segment).X wherein ₀, y ₀The position of representing initial automobile.

Represent initial vertical and horizontal speed.

The steady-state value of representing initial vertical and horizontal acceleration/accel,

Be initial vehicle course angle, Δ tp=T _p/ J, T _pFor taking aim at the time in advance.Because the AFS system promptly starts working before automobile sails bend into, can think this moment automobile side angle speed and the acceleration/accel initial value be zero.The centroid position coordinate that is engraved in the time of can obtaining t+Tp by above calculating in the vehicle axis system is (x _J, y _J), the angle that so just can obtain between vehicle desired location and the longitudinal direction of car axis is that corresponding head lamp horizontally rotates angle

Claims (4)

1. an imitative chaufeur is taken aim at the car headlamp system of behavior in advance, it is characterized in that, this system comprises the information perception unit by groups of acceleration sensors one-tenth, built-in imitative chaufeur is taken aim at the Central Processing Unit (CPU) of head lamp corner calculation procedure of behavior and the driving performance element of being made up of stepping motor in advance, wherein vertically and lateral acceleration sensor acquisition vehicle behaviour information, be transferred to Central Processing Unit (CPU) by the signal transmission network in the car, after Central Processing Unit (CPU) calculates the anglec of rotation of head lamp, angle signal is transferred to the stepping motor that drives in the performance element, and the control motor carries out corresponding action.

2. a kind of imitative chaufeur according to claim 1 is taken aim at the car headlamp system of behavior in advance, it is characterized in that, described acceleration pick-up is used for measuring vehicle vertically and the acceleration change of side direction.

3. a kind of imitative chaufeur according to claim 1 is taken aim at the car headlamp system of behavior in advance, it is characterized in that, described Central Processing Unit (CPU), be used for the acceleration signal according to vertical and lateral acceleration sensor acquisition, the head lamp offset angle calculated with mathematical model of taking aim at behavior by built-in imitative chaufeur in advance goes out the angle that the head lamp horizontal direction should be rotated.

4. take aim at the car headlamp system of behavior in advance according to right 3 described a kind of imitative chaufeurs, it is characterized in that, described head lamp offset angle math modeling, by drive simulating person's forward sight effect, utilize vehicle steady state response characteristic to automobile through the state of kinematic motion after taking aim at time t+Tp in advance

Estimate, thereby to obtain with respect to the deflection angle of automobile longitudinal axis be the angle that horizontally rotates of self adaptation car light,

J=1 in the formula, 2 ... the number of time segments such as Z, J are, wherein x ₀, y ₀The position of representing initial automobile,

Represent initial vertical and horizontal speed,

The steady-state value of representing initial vertical and horizontal acceleration/accel, Be initial vehicle course angle, Δ tp=T _p/ J, T _pFor taking aim at the time in advance, Be system of axes (x _j, y _j) to (x ₀, y ₀) transition matrix because the AFS system promptly starts working before automobile sails bend into, can think that this moment, automobile side angle speed and acceleration/accel initial value were zero, the centroid position coordinate that is engraved in the time of can obtaining t+Tp by above calculating in the vehicle axis system is (x _J, y _J), the angle that so just can obtain between vehicle desired location and the longitudinal direction of car axis is that corresponding head lamp horizontally rotates angle

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