A design method for replacing LED automotive headlights

Abstract

This invention proposes a design method for replacing LED automotive headlights, comprising the following steps: S1. Setting up a main LED light source group near the original halogen filament installation location; S2. Setting up an auxiliary LED light source group on the side of the main LED light source group facing the base, the auxiliary LED light source group comprising two symmetrically arranged auxiliary light sources, the main LED light source group and the auxiliary LED light source group being independently driven or unbalancedly connected in series and parallel; S3. Setting up an auxiliary reflector on the side of the auxiliary LED light source group facing the base. The auxiliary LED light source group and the main LED light source group of this invention employ a non-uniform driving power / luminous flux design, which can control the overall power while ensuring the center light intensity to improve heat dissipation and cost. By adding an auxiliary reflector to improve the original headlight beam distribution, the auxiliary reflector, in conjunction with the auxiliary LED light source group, can effectively increase the horizontal width of the light distribution, significantly improving the driver's visibility when cornering or turning, and enhancing safety.

Description

Technical Field

[0001] This invention relates to the technical field of automotive headlights, and in particular to a design method for a replacement LED automotive headlight. Background Technology

[0002] The existing method for designing LED headlight replacement light sources involves making the LED light source's position and size as close as possible to the original halogen light source's filament position and size. However, this method has the following problems: due to structural limitations and the light distribution characteristics of LEDs, 360-degree illumination cannot be achieved, resulting in common issues such as dark areas and reduced central light intensity. Furthermore, if the original vehicle's headlight beam distribution design is flawed or the customer's lighting experience is inadequate, there are no feasible solutions other than redesigning and completely replacing the headlights. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and propose a design method for replacing halogen bulbs with LED automotive headlights, which can avoid the problems of dark areas and reduced central light intensity that occur after replacing halogen bulbs with LED bulbs.

[0004] To achieve the above objectives, this invention proposes a design method for replacement LED automotive headlights, comprising the following steps:

[0005] S1. Install the main LED light source group near the original halogen filament installation location;

[0006] S2. An auxiliary LED light source group is installed on the side of the main LED light source group facing the base;

[0007] S3. An auxiliary reflective surface is provided on the side of the auxiliary LED light source group facing the base.

[0008] Preferably, the main LED light source group and the auxiliary LED light source group are driven independently or connected in an unbalanced series-parallel manner.

[0009] Preferably, the driving power / luminous flux of the auxiliary LED light source group is 30-50% of that of the main LED light source group, and more preferably, it is 30% of that of the main LED light source group.

[0010] Preferably, the auxiliary LED light source group includes two symmetrically arranged auxiliary light sources, and the main LED light source group includes two symmetrically arranged main LED light sources.

[0011] Preferably, the auxiliary reflective surface includes two reflective surfaces, which are symmetrically arranged on both sides of the base facing the auxiliary LED light source group.

[0012] Preferably, at least one focal point of each reflective surface is located at the geometric center on the same side.

[0013] Preferably, the reflective surface is a concave non-spherical curved surface.

[0014] Preferably, the auxiliary reflective surface is positioned within a range of no more than 3 mm on both sides of the original halogen filament mounting center line.

[0015] Preferably, the center line of the main LED light source group is located at the original halogen filament center line position.

[0016] The beneficial effects of this invention are as follows: The main LED light source group and the auxiliary LED light source group of this invention adopt a non-uniform driving power / luminous flux design, which can control the overall power while ensuring the central light intensity, thereby improving heat dissipation and cost. By adding an auxiliary reflective surface to improve the original headlight beam distribution, the auxiliary reflective surface, together with the auxiliary LED light source group, can effectively increase the horizontal width of the light distribution, significantly improve the driver's vision when cornering or turning, and improve safety.

[0017] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the method of the present invention applied to a typical lighting fixture example;

[0019] Figure 2 This is a structural schematic diagram of an example of replacing LED headlights and light distribution using the method of the present invention;

[0020] Figure 3 This is a simulation result of the low beam light distribution in the original vehicle halogen light source light distribution simulation example;

[0021] Figure 4 This is a simulation result of the high beam light distribution in the original vehicle halogen headlight light distribution simulation example;

[0022] Figure 5 This is a simulation result of the low beam light distribution in an existing near-halogen light source filament position and size LED headlight replacement light source light distribution simulation example.

[0023] Figure 6 This is a simulation result of the high beam light distribution in an existing near-halogen light source filament position and size LED headlight replacement light source light distribution simulation example.

[0024] Figure 7 This is a simulation result of the low beam light distribution in the LED headlight replacement light source light distribution simulation example of the present invention;

[0025] Figure 8 This is a simulation result of the high beam light distribution in the LED headlight replacement light source light distribution simulation example of the present invention. Detailed Implementation

[0026] See Figure 1 and Figure 2 The present invention discloses a design method for a replacement LED automotive headlight, comprising the following steps:

[0027] S1. Install the main LED light source group 1 near the original halogen filament 100 installation location;

[0028] S2. An auxiliary LED light source group 2 is provided on the side of the main LED light source group 1 facing the base 10;

[0029] S3. An auxiliary reflective surface 3 is provided on the side of the auxiliary LED light source group 2 facing the base 10.

[0030] Furthermore, the main LED light source group (1) and the auxiliary LED light source group (2) are driven independently or connected in an unbalanced series-parallel manner. Existing LEDs generally use series or parallel connections for the light sources on both sides, resulting in uniform driving current and luminous flux. The auxiliary LED light source group added in this invention uses independent driving or an unbalanced series-parallel connection to achieve different driving currents and luminous fluxes compared to the main LEDs. The purpose of adding the auxiliary LED light source group is to improve light distribution and reduce the dark areas that appear after replacing halogen lamps with LEDs. Unbalanced driving is used to control the overall lamp power as much as possible while ensuring improvement in the dark areas, thereby controlling heat dissipation and cost. Specifically, in this embodiment, the main LED light source group 1 includes two symmetrically arranged main LED light sources, and the auxiliary LED light source group 2 includes two symmetrically arranged auxiliary light sources. The driving power / luminous flux of the auxiliary LED light source group 2 is 30-50% of that of the main LED light source group 1.

[0031] Furthermore, the auxiliary reflective surface 3 includes two reflective surfaces, symmetrically arranged on both sides of the base 10 facing the auxiliary LED light source group 2. At least one focal point of each reflective surface is located at its geometric center on the same side. In this embodiment, the reflective surface is a concave non-spherical curved surface. By adding auxiliary reflective surfaces, light distribution can be improved, achieving a lateral widening of the light distribution to improve lighting on curves and turns.

[0032] Furthermore, the center line of the main LED light source group (1) is set at the original halogen filament center line position, and the auxiliary reflective surface (3) is set within a range of no more than 3mm on both sides of the original halogen filament (100) installation center line.

[0033] The light distribution simulation analysis of this invention and existing LED automotive headlight replacement methods in a lighting fixture example is as follows:

[0034] See Figure 3 The image shows the simulation result of the low beam distribution in the original vehicle's halogen headlight simulation example, where the horizontal widening is approximately 60 degrees. (See also...) Figure 4The simulation result of the high beam distribution in the original halogen light source light distribution simulation example is shown in the figure. The central bright spot is about 3 degrees horizontally and 4 degrees vertically.

[0035] Problems with the light distribution of original halogen headlights:

[0036] 1. The horizontal width is insufficient, the field of vision is not wide enough when turning or bending, pedestrians or obstacles on the roadside are not easy to spot, and the lighting comfort and safety are slightly insufficient.

[0037] 2. The central bright spot is too small, the light distribution is too concentrated, the road brightness is not uniform, obstacles on the road or outside the road are not easy to see, and the lighting comfort and safety are slightly insufficient.

[0038] See Figure 5 The simulation results of the low beam distribution in existing near-halogen lamp filament positions and sizes for LED headlight replacement light sources show a noticeable dark area directly below the light spot. (See attached image.) Figure 6 The simulation results of the high beam distribution in the LED headlight replacement light source light distribution simulation example of the filament position and size of the existing near-halogen light source in the market show that there is a clear dark area directly below the light spot.

[0039] See Figure 7 The simulation result of the low beam distribution in the LED headlight replacement light source simulation example of this invention shows that the dark area directly below is significantly improved, with a horizontal widening of over 70 degrees. (See also...) Figure 8 The simulation result of the high beam distribution in the LED headlight replacement light source light distribution simulation example of the present invention shows that the dark area directly below is significantly improved and the bright spot in the center is significantly expanded.

[0040] Compared with the two methods mentioned above, the present invention has the following advantages:

[0041] 1. The dark areas that appeared after replacing halogen lamps with LED lamps have been significantly improved and are no longer easily noticeable to the naked eye;

[0042] 2. The horizontal width has been significantly increased, the lighting effect in curves or turns has been significantly improved, and driving comfort and safety have been enhanced;

[0043] 3. The size of the central bright spot has increased significantly, the uniformity of road surface brightness has been significantly improved, and driving comfort and safety have been enhanced.

[0044] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A design method for a replacement LED automotive headlight, characterized in that: Includes the following steps: S1. Set the main LED light source group (1) at the original halogen filament (100) installation position; S2. An auxiliary LED light source group (2) is set on the side of the main LED light source group (1) facing the base (10); S3. An auxiliary reflective surface (3) is provided on the side of the auxiliary LED light source group (2) facing the base (10); The driving power / luminous flux of the auxiliary LED light source group (2) is 30-50% of that of the main LED light source group (1). The auxiliary reflective surface (3) includes two reflective surfaces, which are symmetrically arranged on both sides of the base (10) facing the auxiliary LED light source group (2). At least one focal point of each reflective surface is located at the geometric center on the same side. The auxiliary reflective surface (3) is set within a range of no more than 3 mm on both sides of the original halogen filament (100) installation center line. The center line of the main LED light source group (1) is set at the original halogen filament center line position.

2. The design method for a replacement LED automotive headlight as described in claim 1, characterized in that: The main LED light source group (1) and the auxiliary LED light source group (2) are driven independently or connected in an unbalanced series-parallel manner.

3. The design method for a replacement LED automotive headlight as described in claim 1, characterized in that: The auxiliary LED light source group (2) includes two symmetrically arranged auxiliary light sources.

4. The design method for a replacement LED automotive headlight as described in claim 1, characterized in that: The reflective surface is a concave non-spherical curved surface.

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