CN101398140A - Self-adapting steering headlamp illuminating system - Google Patents

Abstract

The invention discloses an adaptive front turn lamp lighting system. A 2D or 3D acceleration transducer is respectively installed on the lamp and the rotor shafts of the front wheels of a car to measure the angle changes of the car and the front lamp in up, down, right and left directions, and then the turning angles of the front lamp in up, down, right and left directions are calculated through ECU integration, and the turning of the front lamp is controlled by a lamp turning drive and control module, thereby guaranteeing that the illumination of the front lamp in up, down, right and left directions can be correctly adjusted whether the car is in an upslope state or downslope state, accelerates or decelerates, or drives on an uneven road or makes a turn, so that the driving safety of the car is enhanced; the invention also reduces the complexity of the structure of an AFS system and realization cost and improves the transportability of the components in the system; besides, the system also reduces the possible maintenance cost of users and increases the possibility of being popularized for use.

Description

Self-adapting steering headlamp illuminating system

Technical field

The present invention relates to a kind of self-adapting steering headlamp illuminating system (AFS, AdaptiveFront-Lighting System), relate in particular to a kind of self-adapting steering headlamp illuminating system that comes variation of measuring vehicle car appearance and left and right vehicle wheel steering angle to change with acceleration transducer.

Background technology

In order to ensure the traffic safety of vehicle, generally should guarantee the direction of illumination of car light and the wheel shaft line keeping parallelism of car front and rear wheel, specifically as shown in Figure 1.But front lamp of vehicle now commonly used generally all can't be along with concrete conditions such as the variation of vehicle attitude, turn inside diameter are adjusted its lighting system.Under actual conditions, as when passenger loading or get off, the load-carrying of vehicle all can change during loading or unloading, can cause the headstock of vehicle to be faced upward or down partially; In addition when vehicle dynamic is advanced because of acceleration and deceleration, upward slope descending or road surface when uneven, also can cause the variation of vehicle attitude, promptly headstock is faced upward or down partially.Therefore because at this moment car light is to carry out self-adjustingly, when headstock is faced upward, car light has the too high situation of irradiation, specifically shown in Fig. 2 a, at this moment can send a car to cause to the other side and dazzle light effect, has influenced the safety of driving a vehicle; Otherwise when under the headstock when inclined to one side, car light has the low excessively situation of irradiation, shown in Fig. 2 b, can make that at this moment the driver can't see the road conditions in the place ahead clearly, has therefore also influenced the safety of driving.And work as Ackermann steer angle, as shown in Figure 3, the headlight of this vehicle can only be towards front irradiation (as unadjusted direction among Fig. 3), and the situation on the crankcase ventilaton that can't throw light in advance (as adjusted direction among Fig. 3), this especially can cause negative effect to the nighttime driving security.

For this reason, just played as far back as 2003 that the someone has proposed self-adapting steering headlamp illuminating system (AFS), this system can carry out the self adaptation adjustment to the lighting system of headlight according to vehicle attitude and the variation that turns to, thereby: the safety that 1, improves nighttime driving greatly; 2, provide near better bend illumination; 3, avoid fully loaded or because of the caused the other side of causing of situations such as vehicle acceleration safety issues such as dazzling light etc. of sending a car because of vehicle.As shown in Figure 4, structural representation for a kind of AFS commonly used in the prior art, comprise that mainly the information that is used to detect the vehicle walk turns to the driver module (not shown) with sensor, electronic control unit (ECU) 2 and car light, wherein said sensor sends to ECU 2 with its detected information and settles accounts out car light and need the angle of rotating up and down, then by car light turn to driver module to the level of headlight up and down and left and right sides steering angle adjust.

Generally speaking, described sensor further comprises: Vehicular turn angular transducer 1A, be used to detect the angle variation that left and right vehicle wheel turns to, it is installed on the turning cylinder (Steering Column) of steering wheel for vehicle, and by vehicle remittance current drainage (CAN) or other RCAs, send the steering angle data to ECU 2, integrate for 2 pairs of described steering angle data of ECU and to calculate the angle that to rotate on the headlight left and right directions, turn to driver module control headlight to finish the adjustment of the anglec of rotation on the corresponding left and right directions by car light then; Vehicle speed sensor 1B, be used to detect the gait of march of vehicle, it is installed on the wheel shaft of wheel, and by vehicle remittance current drainage (CAN) or other RCAs, send vehicle speed data to ECU 2, calculate the angle that headlight should rotate for ECU 2 integration, turn to driver module control headlight to finish the adjustment of the corresponding anglec of rotation by car light then; Car body car appearance sensor 1C, be used to detect the variation that vehicle under static state reaches attitude under the dynamical state (facing upward or inclined to one side down etc.) as headstock, before, the trailing wheel place respectively is equipped with one, it can be contact (potentiometer) or contactless (hall effect) sensor, and respectively by vehicle remittance current drainage (CAN) or other RCAs, with the vehicle attitude data (as preceding, the altitude information of trailing wheel etc.) send ECU 2 to, calculate as preceding for ECU 2 integration, difference in height between trailing wheel etc., and calculate the angle that headlight should rotate on above-below direction, and then turn to drive control module control headlight to finish the adjustment of the corresponding anglec of rotation by car light.

Certainly, in order to make vehicle can obtain better illuminating effect at different road conditions and different visual range, described sensor also can comprise rain sensor, Light indicator etc.

But the portability and the compatibility of aforesaid AFS system are not fine, and implement comparatively complicated.Because because the checkout apparatus among the ECU generally all is to programme according to the sensor type that reality is used, and the used method of different manufacturers also can be different, in case therefore ECU breaks down, perhaps headlight breaks down when needing to change, the user can only use first wife's ECU or headlight, then need together change together with all sensors, therefore the cost of required cost is not higher.For example, when headlight breaks down the needs replacing, the identical headlight of headlight model that must use and use originally, but under actual conditions, the user for convenience, tend to look for general auto repair company to carry out troubleshooting, but maintenance company can not have the headlight of every kind of model, and original-pack headlight generally is difficult to find on market, and (this may be the reason owing to technology innovation, also may be) owing to reasons such as the place of production cause, therefore need to change all parts in the AFS system usually, but this maintenance cost is too high, and general Automobile Service Company also is difficult to finish.Therefore, the self adaptation that finally often makes the user can only abandon front lamp of vehicle is adjusted function.

At as above problem, the someone has proposed to install the solution of the acceleration transducer (G-sensor) of 2D or 3D in front lamp of vehicle, thereby reaches the purpose of simplifying the AFS system architecture.This AFS system need not special Vehicular turn angular transducer, vehicle speed sensor and car body car appearance sensor, and only need in headlight, to install the acceleration transducer of a 2D or 3D, can detect headlight at least in the acceleration of gravity direction, perpendicular to the headlight of the acceleration of gravity direction acceleration on the direct of travel forward, this acceleration transducer sends the acceleration information that it measures to ECU then, integrate for ECU and to calculate that headstock is faced upward or inclined to one side angle down, calculate the angle that headlight should rotate then on above-below direction, thereby realized adjustment headlight.Certainly, if when using the acceleration transducer of 3D, this system also can realize the headlight adjustment angle on the direction to the left and right.But this class AFS system still exists following problem, for example, and shown in Fig. 5 a, when vehicle is θ along the gradient _WSlope when going up a slope, by here fast acceleration transducer can only calculate the angle θ between headlight direction of illumination (representing with solid line among the figure) and upward slope front irradiation direction (being represented by dotted lines among the figure) at this moment _L, and can't calculate the angle between headlight direction of illumination and actual forward and backward wheel shaft line direction at this moment.In addition, persons skilled in the art should infer, because vehicle driving up can cause headstock to be faced upward, so θ _Lθ _WSo, if at this moment the angle that should rotate on above-below direction of the headlight that calculates of ECU is bigger than normal than the angle that it should rotate, thereby make the direction of illumination of adjusted headlight be actually low, so its control effect is undesirable.In like manner, shown in Fig. 5 b, when vehicle along gradient θ _WSlope when being descending because that descending can cause headstock under is inclined to one side, thus θ _Lθ _W, so the angle that the headlight that calculates of ECU should rotate on above-below direction is bigger than normal than the angle that it should rotate, thus make the direction of illumination of adjusted headlight be actually too high, so its control effect is also undesirable.

Summary of the invention

Technical problem to be solved by this invention provides a kind of self-adapting steering headlamp illuminating system, can reduce structure and implementation complexity, and can to headlight up and down and the direction of illumination of left and right directions adjust exactly, and no matter be that vehicle is in and quickens or when slowing down, when upward slope or descending, when still turning, thereby can improve the degree of safety that vehicle travels.

For solving the problems of the technologies described above, the invention provides a kind of self-adapting steering headlamp illuminating system, comprise: electronic control unit, car light turns to drive control module, it is characterized in that, also comprise: first acceleration transducer that is installed in vehicle front-wheel place, and be installed in second acceleration transducer in the headlight, the output of wherein said first acceleration transducer and described second acceleration transducer all links together with the input of described electronic control unit, and the output of described electronic control unit and described car light turn to the input of drive control module to link together.

Wherein, described first acceleration transducer is the 2D acceleration transducer or is the 3D acceleration transducer, is used for measuring at least: the acceleration change of (1) vehicle on the acceleration of gravity direction; (2) vehicle is perpendicular to acceleration of gravity direction and the acceleration change on the headstock direction.Described first acceleration transducer also can be used for measuring vehicle at the same time perpendicular to the acceleration change on described (1) and (2) both direction.

Described second acceleration transducer is used for measuring the acceleration change of (3) headlight on the acceleration direction; (4) headlight is perpendicular to the acceleration change on acceleration of gravity direction and the direction consistent with the headstock direction.Described second acceleration transducer also can be used for measuring headlight at the same time perpendicular to the acceleration change on above-mentioned (3) and (4) both direction.

The present invention is owing to adopted technique scheme, has such beneficial effect, promptly by the acceleration transducer of a 2D or 3D respectively is installed in car light and front-wheel rotating shaft, come measuring vehicle and headlight in orientation angle variation up and down, integrate by ECU then and calculate the angle that headlight should rotate in direction up and down, turn to the rotation of drive control module control headlight again by car light, thereby guaranteed no matter vehicle is in upward slope or descending, quicken or deceleration, still in rough travels down, perhaps when turning, can both realize the direction of illumination up and down of headlight is adjusted exactly, therefore improve the security that vehicle travels; The present invention has also reduced the structure complexity of AFS system, has reduced the realization cost, has improved the transplantability of parts in the system simultaneously; In addition, system of the present invention has also reduced the possible maintenance cost of user, has improved the possibility of promoting the use of.

Description of drawings

Fig. 1 is the illumination direction schematic diagram of front lamp of vehicle under the normal condition;

Fig. 2 a makes front lamp of vehicle shine the schematic diagram when too high for facing upward when headstock;

Fig. 2 b is the schematic diagram when making front lamp of vehicle shine under the headstock partially to hang down;

Fig. 3 is the direction of illumination schematic diagram of Ackermann steer angle front lamp of vehicle;

Fig. 4 is the structural representation of self-adapting steering headlamp illuminating system in the prior art;

The schematic diagram of acceleration transducer institute angle measurement degree when being vehicle driving up, is installed in the car light Fig. 5 a;

The schematic diagram of acceleration transducer institute angle measurement degree when being the vehicle descending, is installed in the car light Fig. 5 b;

Fig. 6 is the structure diagram of self-adapting steering headlamp illuminating system of the present invention;

Vehicle and the headlight angle on above-below direction changes schematic diagram during Fig. 7 vehicle driving up;

Vehicle and the headlight angle on above-below direction changes schematic diagram during Fig. 8 vehicle descending.

The specific embodiment

Be illustrated in figure 6 as the structure diagram of self-adapting steering headlamp illuminating system of the present invention, comprise: first acceleration transducer 62 is installed in the vehicle front-wheel place.In one embodiment, described first acceleration transducer 62 is the acceleration transducer of 2D, can be used at least measuring: the acceleration change of (1) vehicle on the acceleration of gravity direction; (2) vehicle is perpendicular to acceleration of gravity direction and the acceleration change on the headstock direction.Can calculate the angle of vehicle on above-below direction by the acceleration change on described (1) and (2) direction changes.In another embodiment, described first acceleration transducer 62 can also be the acceleration transducer of 3D, at this moment also can be used for measuring vehicle at the same time perpendicular to the acceleration change on above-mentioned (1) and (2) both direction, by the acceleration change on this acceleration change and described (2) direction, can calculate the angle of vehicle on left and right directions and change.And, the output of this first acceleration transducer 62 converges current drainage (CAN) or other RCAs by vehicle and is connected in the input of electronic control unit (ECU) 62, send to described ECU with the acceleration change data that it is measured, thus by can described ECU calculate vehicle in traveling process up and down or the angle on the left and right directions change.

System of the present invention also comprises the second acceleration transducer (not shown), be installed in the headlight, in one embodiment, this second acceleration transducer is the acceleration transducer of 2D, can be used at least measuring: the acceleration change of (3) headlight on the acceleration direction; (4) headlight is perpendicular to the acceleration change on acceleration of gravity direction and the direction consistent with the headstock direction.Can calculate the angle of headlight on above-below direction by the acceleration change on described (3) and (4) direction changes.In another embodiment, described second acceleration transducer can also be the acceleration transducer of 3D, at this moment also can be used for measuring headlight at the same time perpendicular to the acceleration change on above-mentioned (3) and (4) both direction, by the acceleration change on this acceleration change and described (4) direction, can calculate the angle of headlight on left and right directions and change.And, the output of this second acceleration transducer also is connected in the input of electronic control unit (ECU) 61 by vehicle remittance current drainage (CAN) or other RCAs, send to described ECU 61 with the acceleration change data that it is measured, thus can by described ECU 61 calculate headlight in the vehicle traveling process up and down or the angle on the left and right directions change.

System of the present invention also comprises electronic control unit (ECU) 61, be used for converging current drainage (CAN) or other RCAs and receive acceleration change data from first acceleration transducer 62 and second acceleration transducer by vehicle, and calculate respectively vehicle and headlight up and down or the angle on the left and right directions change, change according to these angles then, integrate and calculate headlight up and down or the angle that should rotate of left and right directions.

System of the present invention comprises that also car light turns to drive control module (not drawing among the figure), its input converges the output of current drainage (CAN) or other RCAs and ECU 61 by vehicle and links together, this module is used to receive the angle that headlight that ECU 61 calculates should rotate, and is rotated on the direction all around according to this angle control headlight then.

In order more clearly to explain principle of the present invention, come the computational methods of associated change angle are described further below by concrete Application Example:

Vehicle and the headlight angle on above-below direction changes schematic diagram when being illustrated in figure 7 as vehicle driving up, wherein the direction before the label 71 expression vehicle driving ups; The direction of headlight before the 72 expression vehicle driving ups; Direction behind the 73 expression vehicle driving ups; The direction of headlight behind the 74 expression vehicle driving ups.If at this moment the acceleration change of vehicle on above-mentioned (1) and (2) direction that measured of first acceleration transducer 61 is respectively Δ a _HW1With Δ a _XW1And the acceleration change of the headlight that second acceleration transducer is measured on above-mentioned (3) and (4) direction is respectively Δ a _HL1With Δ a _XL1Therefore vehicle variable in distance on above-mentioned (1) and (2) direction in the Δ t time is respectively: ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="hW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hW</figure-callout>}1}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{hW}1}{\left(\mathrm{\&Delta;t}\right)}^2$ With ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="xW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">xW</figure-callout>}1}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{xW}1}{\left(\mathrm{\&Delta;t}\right)}^2,$ Therefore ${\mathrm{\&theta;}}_{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">W</figure-callout>}1}=\arctan \left(\frac{{\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="hW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hW</figure-callout>}1}}{{\mathrm{\&Delta;s}}_{\mathrm{xW}1}}\right).$ And headlight variable in distance on above-mentioned (3) and (4) direction in the Δ t time is respectively: ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="hL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hL</figure-callout>}1}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{hL}1}{\left(\mathrm{\&Delta;t}\right)}^2$ With ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="xL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">xL</figure-callout>}1}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{xL}1}{\left(\mathrm{\&Delta;t}\right)}^2,$ Therefore ${\mathrm{\&theta;}}_{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">L</figure-callout>}1}=\arctan \left(\frac{{\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="1"\; label="hL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hL</figure-callout>}1}}{{\mathrm{\&Delta;s}}_{\mathrm{xL}1}}\right).$ Because in the present invention, headlight is in the dynamic adjustment, its adjusted purpose is to make the headlight direction of illumination parallel with the line direction of vehicle front and back wheel shaft, therefore lines 71 and 72 should be parallel, are θ so can integrate the angle that the headlight that calculates should be rotated down by ECU61 at last _X1=θ _L1-θ _W1

Vehicle and the headlight angle on above-below direction changes schematic diagram when being illustrated in figure 8 as the vehicle descending, wherein the direction before the label 81 expression vehicle descendings; The direction of headlight before the 82 expression vehicle descendings; Direction behind the 83 expression vehicle descendings; The direction of headlight behind the 84 expression vehicle descendings.If at this moment the acceleration change of vehicle on above-mentioned (1) and (2) direction that measured of first acceleration transducer 61 is respectively Δ a _HW2With Δ a _XW2And the acceleration change of the headlight that second acceleration transducer is measured on above-mentioned (3) and (4) direction is respectively Δ a _HL2With Δ a _XL2Therefore vehicle variable in distance on above-mentioned (1) and (2) direction in the Δ t time is respectively: ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="hW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hW</figure-callout>}2}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{hW}2}{\left(\mathrm{\&Delta;t}\right)}^2$ With ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="xW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">xW</figure-callout>}2}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{xW}2}{\left(\mathrm{\&Delta;t}\right)}^2,$ Therefore ${\mathrm{\&theta;}}_{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">W</figure-callout>}2}=\arctan \left(\frac{{\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="hW"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hW</figure-callout>}2}}{{\mathrm{\&Delta;s}}_{\mathrm{xW}2}}\right).$ And headlight variable in distance on above-mentioned (3) and (4) direction in the Δ t time is respectively: ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="hL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hL</figure-callout>}2}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{hL}2}{\left(\mathrm{\&Delta;t}\right)}^2$ With ${\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="xL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">xL</figure-callout>}2}=\frac{1}{2}{\mathrm{\&Delta;a}}_{\mathrm{xL}2}{\left(\mathrm{\&Delta;t}\right)}^2,$ Therefore ${\mathrm{\&theta;}}_{21}=\arctan \left(\frac{{\mathrm{\&Delta;s}}_{\mathrm{<figure-callout\; id="2"\; label="hL"\; filenames="A200710152301E00151.png"\; state="\{\{state\}\}">hL</figure-callout>}2}}{{\mathrm{\&Delta;s}}_{\mathrm{xL}2}}\right).$ Because in the present invention, headlight is in the dynamic adjustment, its adjusted purpose is to make the headlight direction of illumination parallel with the line direction of vehicle front and back wheel shaft, therefore lines 81 and 82 should be parallel, are θ so can integrate the angle that the headlight that calculates should rotate up by ECU at last _X2=θ _L2-θ _W2

According to top identical principle, also can calculate vehicle when turning to the left or to the right, the angle that vehicle should rotate on left and right directions.

Claims (9)

1, a kind of self-adapting steering headlamp illuminating system, comprise: electronic control unit, car light turn to drive control module, it is characterized in that, also comprise: first acceleration transducer that is installed in vehicle front-wheel place, and be installed in second acceleration transducer in the headlight, the output of wherein said first acceleration transducer and described second acceleration transducer all links together with the input of described electronic control unit, and the output of described electronic control unit and described car light turn to the input of drive control module to link together.

2, self-adapting steering headlamp illuminating system according to claim 1 is characterized in that, described first acceleration transducer is the 2D acceleration transducer or is the 3D acceleration transducer.

3, self-adapting steering headlamp illuminating system according to claim 2 is characterized in that, described first acceleration transducer is used for measuring at least: the acceleration change of (1) vehicle on the acceleration of gravity direction; (2) vehicle is perpendicular to acceleration of gravity direction and the acceleration change on the headstock direction.

4, self-adapting steering headlamp illuminating system according to claim 3 is characterized in that, described first acceleration transducer also is used for measuring vehicle at the same time perpendicular to the acceleration change on described (1) and (2) both direction.

5, self-adapting steering headlamp illuminating system according to claim 1 is characterized in that, described second acceleration transducer is the 2D acceleration transducer or is the 3D acceleration transducer.

According to the described self-adapting steering headlamp illuminating system of claim 5, it is characterized in that 6, described second acceleration transducer is used for measuring at least: the acceleration change of (3) headlight on the acceleration direction; (4) headlight is perpendicular to the acceleration change on acceleration of gravity direction and the direction consistent with the headstock direction.

7, self-adapting steering headlamp illuminating system according to claim 6 is characterized in that, described second acceleration transducer also is used to measure headlight at the same time perpendicular to the acceleration change on described (3) and (4) both direction.

8, self-adapting steering headlamp illuminating system according to claim 1, it is characterized in that, described electronic control unit, be used for the acceleration change data that receive from described first acceleration transducer and second acceleration transducer according to it, calculate respectively vehicle and headlight up and down or the angle on the left and right directions change, and change according to described angle, integrate and calculate headlight up and down or the angle that should rotate of left and right directions.

9, according to claim 1 or 8 described self-adapting steering headlamp illuminating systems, it is characterized in that, described car light turns to drive control module, is used for the angle information that should rotate according to the headlight that receives from electronic control unit, and the control headlight is being rotated up and down or on the left and right directions.

Images