LED vehicle lamp module heat dissipation control method and device

Abstract

The invention relates to the field of vehicle illuminating lamp heat dissipation, in particular to an LED vehicle lamp module heat dissipation control method and device. According to the LED vehicle lamp module heat dissipation control method, the standard work temperature TL, the standard work current IL and the limit working temperature Tmax of an LED vehicle lamp module, and the limit rotation speed rmax of a heat dissipation fan are set, and the heat dissipation fan is controlled according to the temperature Tj in the LED vehicle lamp module; when Tj is smaller than or equal to TL, the heat dissipation fan does not work; when Tj is larger than TL and r is smaller than rmax, a controller controls the heat dissipation fan to be started, r is equal to f(Tj), and Ij is equal to IL; when Tj is larger than TL and r is equal to rmax, the controller controls the current Ij of the LED vehicle lamp module to be lowered gradually till r is smaller than rmax; and when Tj is equal to Tmax, Ij is lowered to 0. According to the LED vehicle lamp module heat dissipation control method and device, the temperature is controlled to below the limit temperature through the controllable heat dissipation fan, the requirement for a heat dissipation assembly is lowered, the size can be reduced, and the lightweight need is also met. Meanwhile, on the premise that the heat dissipation ability can be met, LED luminous flux output is further increased, illuminance is improved, and driving safety is ensured.

Description

technical field [0001] The invention relates to the field of heat dissipation of vehicle lighting lamps, in particular to a heat dissipation control method and device for an LED vehicle light module. Background technique [0002] Due to regulations and lighting requirements on the luminous flux output of LED headlights, only high-power LEDs can meet the demand, but if high-power LEDs are not cooled in time, the output of LED luminous flux will be affected, and extreme conditions may cause LED damage. At present, there are three types of cooling systems for LED headlights on the market: active cooling, passive cooling, and circuit current limiting: [0003] 1. Active cooling is mainly based on the cooling fan. This type of cooling fan will work at full power as long as the headlights are turned on. No matter what the external environment is, it will easily cause energy waste and reduce the life of the fan. [0004] 2. Passive heat dissipation is mainly based on metal heat si...

AI Technical Summary

Problems solved by technology

[0003] 1. Active cooling is mainly based on the cooling fan. This type of cooling fan will work at full power as long as the headlights are turned on. No matter what the external environment is, it will easily cause energy waste and reduce the life of the fan.

[0004] 2. Passive heat dissipation is mainly based on metal heat sinks with high thermal conductivity. In order to meet the conditions of the limit state of the car, the heat sink block has a large volume and weight. Severe attenuation or LED damage

[0005] 3. The current limiting heat dissipation of the circuit mainly uses the thermistor as a sensor to control the LED current by detecting the temperature. Although the LED is protected from heat damage, it will cause a sharp drop in luminous flux, affecting normal lighting requirements, and posing a safety hazard

Most of the existing radiators are controlled only by simply correlating the temperature with the radiator speed, without actually considering the fan performance, temperature sensor position and the influence of the power of the LED itself. The set power and speed of the cooling fan are often high. Unable to meet the requirements of lightweight and energy saving and environmental protection

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