KR100329668B1 - Optical axis control system for automobile head-lamp - Google Patents

Abstract

PURPOSE: An optical axis control system of a headlamp for a vehicle is provided to secure flexibility in design of a headlamp and improve safety and reliability of motion by controlling a motor through current drive. CONSTITUTION: An optical axis control system of a headlamp for a vehicle comprises a power-transmitting unit, a power-converting gear(18) for converting reduction-rotary power of the power-transmitting unit into rectilinear movement, an appearing and disappearing rod(20) performing a slide motion by the power-converting gear, and a printed plate board(26) to electrically fix a control circuit and parts for the control circuit sensing the movement point of the appearing and disappearing rod by a potentiometer(22) interlocking with a current motor(8) and controlling current of the current motor. The power-transmitting unit comprises a housing(4) for housing plural parts, a cover, the direct current motor inclined, a pinion(10), a pinion gear(12), and a worm(14) and a worm gear(16). The motor and worm and worm gear are installed with slant and therefore, the whole volume, process, and noise of the optical axis control system are reduced and the effective space is secured.

Description

Optical axis control system for automobile head-lamp}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical axis control system for a head lamp for automobiles. It provides flexibility when designing headlamps, and it can operate range and hysteresis from the outside and drive motor with current control to achieve precise control by being strong against external noise. The present invention relates to an optical axis control system for a headlamp that has improved safety and reliability.

In general, the headlamp that illuminates the front of the vehicle is composed of a housing, a reflector, a lens, a light bulb, a connector, an electric wire (harness), and a manual reflector angle adjusting device that adjusts the optical axis by adjusting the tilt of the reflector. At this time, the optical axis of the headlamp is set at about -0.57 °, so it is slightly lowered than the horizontal plane.

On the other hand, when the vehicle's center of gravity moves in front of or behind the vehicle due to the addition or subtraction of passengers, the presence or absence of loads, and the load change of the loads, the optical axis (beam angle) of the headlamp is the reference optical axis (- Since it is irradiated upward or downward than 0.57 °, it is a factor that hinders safe driving.

Therefore, the shaft is installed so that the reflector can be tilted, and then the optical reflector of the headlamp is adjusted by adjusting the tilt (angle) of the reflector with a manual reflector angle adjusting device.

In addition, if the center of gravity moves to the front or back of the car body due to a change in the number of passengers or a change in load during driving, the optical axis cannot be changed by manual reflector angle adjustment device. The optical axis control system for headlamps that can adjust the optical axis at the optimum angle by simple switch operation is applied to automobiles. The conventional optical axis control system for headlamps mounted on automobiles has a large number of parts and its structure is complicated to manufacture and assemble. Not only does it take time and expense, but it uses a deceleration method using spur gears, so it is noisy and the total volume is relatively large.In addition, as the total volume of the headlamp increases, the size of other parts installed inside the engine room Due to many constraints on location, it is mounted inside the headlamp There can be no problems.

In addition, since the motor is controlled by a voltage driving that is relatively weak against noise, accurate control is difficult and the operation of the load is inaccurate.

Accordingly, the present invention provides flexibility in designing a headlamp by greatly reducing the overall volume, process, and noise of a power transmission device composed of a motor and a plurality of gears, thereby ensuring effective space in the vehicle (in the engine room). It is an object of the present invention to provide an optical axis control system for a headlamp.

In addition, it is possible to adjust the range and hysteresis from the outside, and to provide an optical axis control system for the headlamp that improves the safety and reliability of operation by driving the motor with current control that can achieve precise control by being resistant to external noise. There is this.

In order to achieve the above object, the power transmission device consisting of a motor and a gear group that is current controlled is installed inclined in the housing, and the wandering rod is a motion conversion gear that converts the rotational force transmitted from the power transmission device into linear motion. Adjust the angle of inclination of the reflector by adjusting the incidence of the slider), and the spherical connector is formed at the end of the output rod so that it can be coupled to the reflector. Makes it easy and easy to adjust the beam angle.

In addition, the inclination angle of the reflector can be adjusted by mounting the optical axis control system in the housing of the head lamp or the exterior of the head lamp housing, and when the optical axis control system is mounted on the exterior of the housing, If the optical axis control system is mounted inside the housing, a sealing structure for watertightness is unnecessary.

In addition, when the coupling groove of the connector fixed to the printed board is fixed to the front side, the wire harness is coupled with the insertion groove of the cover, and when the coupling groove of the connector is fixed to the rear side, the wire harness can be coupled with the insertion groove of the housing. Depending on the surrounding conditions or situation, the wire harness can be selectively combined with the insertion groove of the housing or cover.

1 is an external perspective view of an exploded state of the optical axis control system of the present invention.

Figure 2-Front view of the housing part just before assembling the parts in the present invention.

3-a front view of the housing part in the assembled state in the present invention,

4-part sectional view of the hauling rod of the present invention.

5-A perspective view of the inner side of the lid of the present invention.

6-circuit diagram of an embodiment of the present invention.

Fig. 7-Internal equivalent circuit diagram of an optical axis control IC of the headlamp of the present invention.

<Description of the symbols for the main parts of the drawings>

(2)-optical control system for headlamps (4)-housing

(6)-cover (8)-DC motor

(8a) (8b)-projection of a direct-current motor (10)-pinion

(12)-Pinion Gear (14)-Worm

16)-Worm Gears (18)-Power Conversion Gears

(20)-Hunting Rod (22)-Potentiometer

(24)-Control Circuit (26)-Printed Board

(28)-Tanji Phi (30) (32) (36) (36a)-Hyperhome

(38)-Indentation Groove (40)-Soccer

(42)-Stopper (44)-Guide

(46) (46a)-Naked Version (48) (50)-Insertion Groove

(52)-Connector (54)-Mating Groove

(56)-Hook (58)-Jang groove

(62) (62a) (64) (64a)-cylindrical part (62b) (64b) -hole

(66)-protrusion (70)-shaft

(72)-Soccer (74)-Screw

(76)-Thread (78)-Home

(80)-Connection (82)-Control Section

(CM)-Center axis of motor (CP)-Center axis of pinion gear

(V _B ⁺ ) (E)-Battery Power (D)-Diode

(C)-capacitor (R)-resistance

(IC)-Optical Control IC (G)-Settings

(RA)-range amplifier (G)-stage setting

(SA)-Servo Amplifier (HA)-Hysteresis Amplifier

(PL)-Protection Logic (HB)-Bridge

(θ1)-tilt angle between the print board and the motor

(θ2)-tilt angle between the central axis of the pinion gear and the central axis of the motor

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an external perspective view of an exploded state of an optical axis control system 2 for a headlamp according to the present invention, in which a plurality of parts are embedded A power transmission device comprising a housing 4, a cover 6, a DC motor 8 installed at an inclined angle, a pinion 10, a pinion gear 12, a worm 14 and a worm gear 16; , A power converter gear 18 for converting the deceleration rotational force of the power transmission device into a linear motion, a wandering rod 20 that slides by the power converter gear 18, and a potentiometer 22 that cooperates with the motor 8. The control circuit 24 which senses the moving point of the intruder rod 20 and controls the DC motor 8 and the printed circuit board 26 to which the components for the control circuit 24 are electrically fixed. .

The inside of the housing 4, the holding piece 28 and the gripping groove 30, 32, in which the front and rear protrusions 8a, 8b of the DC motor 8 are forcibly fitted as shown in FIGS. 2 and 3. Are formed to prevent the flow of the motor 8, and also to form the pinching grooves (36, 36a) for supporting the shaft rods (34, 34a) protruding to both sides of the worm (14) To prevent fluctuations of the shaft, and to form a recess hole 38 into which the power conversion gear 18 is inserted and a shaft hole 40 into which the driving rod 20 is inserted. A guide groove 44 into which the stopper 42 protruding in the longitudinal direction of the 20 is inserted is formed, and a pair of clamping pieces 46 of upper and lower portions are formed on the inner lower portion of the housing 4 and the lid 6 ( A plurality of 46a) is formed at appropriate intervals so that the printed board 26 can be fitted and fixed.

On one side of the housing 4 and the cover 6, the harness insertion grooves 48 and 50 are formed to face each other as shown in FIGS. 1 and 2 to couple the wire harness to the connector 52 fixed to the printed board 26. Do it.

In the above, when the coupling groove 54 of the connector 52 is fixed to the front side, the wire harness can be coupled through the insertion groove 50 of the cover 6, and conversely, the coupling of the connector 52. When the groove 54 is fixed to the rear side, the wire harness can be coupled through the insertion groove 48 of the housing 4, so that the insertion groove 48 or the cover of the housing 4 may vary depending on the surrounding conditions or circumstances. (6) has an advantage that can selectively couple the wire harness through the insertion groove (50).

A plurality of hooks 56 and a locking groove 58 are formed in the housing 4 and the cover 6 so that the housing 4 and the cover 6 can be separated and combined, and the housing 4 and the cover 6 are separated. Cylindrical portions 62, 62a, 64 and 64a, respectively positioned on the upper and side surfaces of 6, are provided with holes 62b and 64b that can engage with mounting holes formed in the housing of the headlamp. To facilitate assembly, and a plurality of protrusions 66 are formed on the inner surface of the lid 6 so as to attenuate the up and down vibrations of the motor 8.

In addition, as shown in FIG. 3, the central axis CM of the printed circuit board 26 and the motor 8 form an angle θ1 around 15 °, and the central axis CP of the pinion gear 12 and the motor 8. The central axis (CM) of the c) may also form an angle θ2 around 15 °, thereby greatly reducing the volume of the housing 4.

The pinion 10 is fitted to the rotary shaft rod of the motor 8, and then the pinion gear 12 is installed to be inclined, and the worm 14 integrally formed with the pinion gear 12 is engaged with the worm gear 16. The rotational force of (8) is transmitted to the power converter gear 18.

The end of the shaft 34a of the worm 14 is formed in a spherical shape as shown in FIG. 3 to reduce the frictional resistance by making point contact with the stopper, and the shaft portion 70 of the worm gear 16 is formed in the housing 4. A screw thread formed on the outer circumferential surface of the mounting rod 20 is formed on the inner shaft hole 72 of the worm gear 16 so as to be rotated by being coupled to the recess groove 38. Engage (76) to interlock.

The wobble rod 20 performs the final output of the optical axis control system 2 for the headlamp of the present invention, and acts on the action of the stopper 42 and the guide groove 44 protruding in the longitudinal direction of the wobble rod 20. As a result, the rotation of the mounting rod 20 is prevented and only linear movement is possible. Therefore, since the linear movement of the mounting rod 20 is transmitted to the reflector of the headlamp, the tilt (angle) of the reflector can be adjusted.

At the end of the projecting rod 20, the clamping groove 78 and the connecting piece 80, into which the operating rod 76 of the potentiometer 22 fixed to the printed circuit board 22 is inserted, protrude to form an end of the projecting rod 20. The moving point can be detected, and when the set moving point is reached, the controller 82 stops the motor 8 to complete the calibration of the optical axis.

FIG. 6 is a control circuit 24 of the present invention using a current controlled optical axis control IC (IC) used in a headlamp, and FIG. 7 is an internal equivalent circuit diagram of an optical axis control IC (IC) of the headlamp. The capacitor 8 to compensate for the inrush current when the reverse voltage protection diode D1 and the motor 8 are started to the power supply V _B ⁺ and E supplied from the battery, and the motor 8 Zener diodes D2 and potentiometers 22 for protecting P are connected in parallel.

Inside the optical axis control IC of the headlamp, the range amplifier RA connected to the setting unit G through the resistor R3, and the signal input terminal G and the potentiometer through the resistors R1 and R3. A hysteresis amplifier HA connected to 22 and connected to the servo amplifier SA for phase control of the motor 8, pull-up resistors R4 and R5, and these amplifiers RA and SA HA. The upper and lower limit voltages of the motor 8 are determined by connecting the outputs of the motors 8 to protect the motor 8 from overheating. A pair of bridges (HB) for controlling the built-in, the bridge (HB) is a capacitor (C3) for absorbing the noise (C3) generated from the two terminals of the motor (8) and the contact of the motor (8) A capacitor C2 that absorbs and removes noise components mixed in the input signal is connected to the inputs of both ends of the servo amplifier SA.

The optical axis control IC (IC) of the head lamp is a semiconductor device changed from a conventional voltage drive type to a current drive type, and the resistors R3 and R5 connected to the hysteresis amplifier HA are sensitive to external noise and an operating error. The motor 8 is operated smoothly at a ratio, and the range of the set signal is adjusted at the ratio of the resistance value of the resistors R1 and R2 connected to the setting unit G, and connected to the hysteresis amplifier HA. It is associated with resistors R3 and R5.

On the other hand, when the signal input to the setting unit (G) exceeds the range range, the protection circuit of the protection logic (PL) operates to protect the motor (8), the range amplifier (RA) is applied to the constant value of the resistor (R3) According to the determination of the appearance (stroke) of the mounting rod 20, the protection when the appearance of the mounting rod 20 detected by the potentiometer 22 is more than the stroke set by the resistance (R3) protection The stop signal is output to the logic PL and the motor 8 is immediately stopped, and therefore the wandering rod 20 is wandered at a set distance.

The setting unit G installed near the driver's seat board or the board may operate the set values input to the servo amplifier SA and the protection logic PL in 0, 1, 2, 3, and so on. It consists of a multi-stage selector switch that allows the optical axis to be shifted up or down according to the vehicle's center of gravity movement.

That is, if only the driver boards the car and sets it to the zero stage, which is the basic state without moving the center of gravity of the car, there is no change in the appearance of the wandering rod 20, and a person rides or loads on the rear seat or the trunk (or the loading box). When the center of gravity of the vehicle moves to the rear of the vehicle, when the driver sets the setting unit G to 1, 2, or 3 stages, the light beam 20 is set to the set value and the optical axis is adjusted. As the number of stages (G) increases, the length of the shedding rod 20 gradually protrudes, and the inclination of the reflector increases.

In addition, the emitter current of the transistors Q1 and Q2 of FIG. 7 is set according to the ratio of the values of the resistors R1 and R2 to the voltage applied by the selection of the setting unit G, and the transistor Q3 is set. The value of V _CE is determined, and the voltage distributed by the resistors R5 and R6 is supplied to the protection logic PL and the motor 8 rotates forward or reversely by current control, so that the projecting of the shedding rod 20 is performed. The degree and immersion are determined and the tilt angle of the reflector is adjusted accordingly.

That is, the protective logic PL drives the motor 8 under current control until the resistance value set by the setting unit G is reached, and the potentiometer 22 is driven in accordance with the linear movement of the projecting rod 20. Between the operation of 76 is also interlocked, so the resistance value of the potentiometer 22 is continuously input to the servo amplifier (SA) and the protective logic (PL), the protective logic (PL) part is the reference set by the setting unit (G) When the resistance value and the resistance value input from the potentiometer 22 are compared and matched, the motor 8 is stopped. Therefore, the projecting rod 20 is stopped, the tilt of the reflector is stopped, and the optical axis is corrected to the desired axis.

Reference numeral 88 is a motor connection terminal, 90 is a capacitor, 92 is a diode, 94 is a cutting groove.

The optical axis control system 2 for the headlamp of the present invention configured as described above is mounted inside or outside the headlamp and adjusts the inclination angle of the reflector according to an external electrical signal as shown in FIG. Beam irradiation angle).

In other words, if there is a passenger in the rear seat of the car or loads luggage in the trunk, the center of gravity of the car moves to the rear, so that the front of the car body rises above the rear side, and the optical axis of the headlamp is also irradiated above the reference axis, which prevents safe driving .

At this time, the driver operates the setting unit G installed near the driver's seat or the board to set a reference resistance value suitable for the weight movement, and the reference resistance value is inputted to the protective logic PL, and the protective logic PL ) Rotates the motor 8 forward (or reverse) by the current control, and the pinion 10, the pinion gear 12, the worm 14, and the power conversion gear 18 rotate in turn. Rotational force is transmitted to the mounting rod 20 screwed to the 18, but the rotational force is suppressed by the stopper 42 and the guide groove 44, so that the mounting rod 20 protrudes (or immerses), the mounting rod 20 As the reflector rotates counterclockwise (or clockwise) around the axis of rotation according to the protrusion (or immersion) of), the optical axis is lowered, and the resistance value of the potentiometer 22 input to the protective logic PL is set. If the control unit 82 matches the reference resistance set to (G), the control unit 82 stops the motor 8. As the movement of the shedding rod 20 and the rotation of the reflecting mirror are stopped, the downward optical axis is fixed.

In addition, when the occupant gets off at the rear seat of the car or the luggage is reduced in the trunk, the center of gravity of the car moves to the front, so the rear side of the body rises higher than the front, and the optical axis of the headlamp is also irradiated downward than the reference optical axis. It is an obstacle.

At this time, the driver operates the setting unit G installed near the driver's seat or the board to set the reference resistance value suitable for the weight movement, and the reference resistance value is inputted to the protective logic PL. Unit rotates the motor 8 reversely (or forward) by current control, and the pinion 10, the pinion gear 12, the worm 14, and the power conversion gear 18 rotate in turn. Rotational force is transmitted to the mounting rod 20 screwed to the 18, but the rotational force is suppressed by the stopper 42 and the guide groove 44, so that the mounting rod 20 is immersed (or protruding), the mounting rod 20 As the reflector rotates clockwise (or counterclockwise) about the axis of rotation according to the immersion (or protrusion) of), the optical axis is raised, and the resistance value of the potentiometer 22 input to the protective logic PL is set. If the reference resistance value is set to (G), the protective logic (PL) unit stops the motor (8). This rotation of the mobile mirror and the retracting rod 20 to the upstream optical axis stopping is fixed.

In the above, the motor 8 is driven by current control which is resistant to external noise and achieves precise control, thereby improving safety and reliability of operation.

In addition, the inclination angle of the reflector can be adjusted by mounting the optical axis control system 2 of the present invention inside the housing of the headlamp or the exterior of the headlamp, and for maintaining watertightness when the optical axis control system is mounted outside of the housing. A sealing structure is required, and when the optical axis control system 2 is mounted inside the housing of the headlamp, a sealing structure for watertightness is unnecessary.

In addition, when fixing the coupling groove 54 of the connector 54 fixed to the printed circuit board 26 in the cover 6 direction, the wire harness can be coupled to the insertion groove 50 formed in the cover 6, When the coupling groove 54 of the connector 52 is fixed to the rear of the housing 4, the wire harness can be coupled through the insertion groove 48 of the housing 4, so that the wire harness may be installed according to the surrounding conditions or circumstances. (4) or the insertion groove 48, 50 of the cover 6 can be selectively coupled.

In addition, since the power transmission device of the present invention is composed of a pinion 10 and a pinion gear 12 and a worm 14 and a worm gear 16 orthogonal to have a small torsion angle, the smooth power is transmitted to the shedding rod 20. Since noise is reduced and power transmission load and frictional resistance are reduced, the life of the optical axis control system of the present invention can be extended and the volume and torque of the motor 8 can be somewhat reduced.

As described above, the present invention can easily adjust the appearance of the haunting rod (B / slider) by a switch operation using a motor, a power transmission device, and a motion conversion gear, and thus, the inclination angle of the reflector and the optical axis according thereto. It has the effect of quick and easy adjustment.

In addition, the power transmission device composed of a motor and a gear group controlled by a current is inclined so that the total volume, process and noise of the optical axis control system can be greatly reduced, thereby securing a large amount of effective space in the vehicle (in the engine room). When designing the headlamps, it is possible to give flexibility.

In addition, there is an effect that the operation reliability is improved by controlling the motor to a current drive type that can achieve precise control and strong against external noise.

In addition, when the optical axis control system of the present invention is installed in the housing of the headlamp, a sealing structure for watertightness is unnecessary, and flexibility in designing the headlamp may be provided.

In addition, inserting grooves facing the housing and the cover are formed, and the coupling groove of the connector fixed to the printed board is fixed to the front or the rear, so that the wire harness is selected as the insertion groove of the housing or the insertion groove of the cover according to the surrounding conditions or circumstances. It can work.

In addition, when the signal input to the setting unit G exceeds the range range, the protection circuit of the protection logic PL is operated to protect the motor 8.

In addition, since the number and volume of parts are greatly reduced, it is a useful invention that the assembly process and production process are shortened to about one third and manufacturing cost is reduced.

Claims (4)

A power transmission device composed of a motor and a plurality of gear groups under the control of the control circuit is inclined in the housing having a cover, and the rotational force transmitted and decelerated from the power transmission device by the power conversion gear, the stopper and the guide groove. A system for controlling the optical axis of the headlamp by adjusting the inclination angle of the reflecting mirror to the linearly projecting rod; Protruding forming the pinching groove 78 and the connecting piece 80 is fitted to the operating rod 76 of the potentiometer 22 to the end of the mounting rod 20 to detect the moving point of the mounting rod 20, the housing (4) and the cover (6) is formed to face the insertion groove (48, 50), the coupling groove 54 of the connector 52 fixed to the printed circuit board 26 is fixed to face the front or rear Optical axis control system of a headlamp for automobiles, characterized in that the wire harness can be selectively coupled. 5. The optical axis control system according to claim 4, wherein a plurality of projections (66) are formed on the inner side of the cover (6) to damp the up and down vibrations of the motor (8). 5. A housing according to claim 4, wherein a plurality of hooks 56 and a locking groove 58 are formed in the housing 4 and the cover 6, respectively, so that the housing 4 and the cover 6 can be separated and joined. Cylindrical portions 62, 62a, 64 and 64a having holes 62b and 64b on the upper and side surfaces of the housing 4 and the cover 6 can be easily coupled to the mounting holes of the headlamps. The optical axis control system of a headlamp for a vehicle, characterized in that it is possible to. The capacitor circuit of claim 4, wherein the control circuit 24 compensates the inrush current when the reverse voltage protection diode D1 and the motor 8 are started to the power supply V _B ⁺ E supplied from the battery of the vehicle. (C1), the zener diode (D2) which protects the motor (8) from the incoming overvoltage, and the potentiometer (22) are connected, respectively, and the setting unit (G) and the inside of the optical axis control IC (IC) of the headlamp The range amplifier RA connected, the multi-stage setting unit G and the potentiometer 22 are connected, and the servo amplifier SA which phase-controls the motor 8, the hysteresis amplifier HA, and these amplifiers RA Protective logic (PL) and protective logic (PL) output to prevent overheating of the motor (8) by determining the upper and lower limit voltages of the motor (8) by connecting the outputs of SA (HA). To the bridge HB and the motor 8 in order to rotate the motor 8 forward and reverse by current control. Control system.