Automobile steering lamp flashing controller and control method thereof

Abstract

The invention discloses a flashing controller of an automobile turn signal lamp and a control method thereof. The controller is provided with an MCU control circuit, a voltage and current sampling circuit and a control for setting and storing the voltage and current characteristics of a specific load. The interface can store the current parameter value of the turn signal load under a specific voltage within the operating voltage range of the controller, and adjust the parameter value according to different turn signal load requirements, so that it can identify small current turn signal loads (such as LED lamps) within the operating voltage range Load) open-circuit fault, avoiding the disadvantages caused by the traditional flash controller being unable to identify the load change of the small current lamp within the working voltage range, and realizing the turning signal flashing and main lamp fault indication flashing required by the car, satisfying the small current The load is applied to the functional requirements of the automobile turn signal, and has the characteristics of simple structure, easy realization, convenience and practicality.

Description

technical field [0001] The invention relates to a vehicle lamp control device, in particular to a flashing controller of an automobile turn signal lamp and a control method thereof. Background technique [0002] Automobile turn signal is an important signal device for notifying front and rear vehicles when a motor vehicle is turning or overtaking. Its working condition directly affects traffic safety. Including the failure display of the main light. [0003] At present, the generally accepted flash controllers for automotive turn signals generally use a dedicated flash IC module, use a sampling resistor to monitor the change of the load current, and connect an external RC to control the output flash frequency, so as to realize the turn signal flash and main light failure indicator flash required by the car. [0004] figure 1 It is the schematic diagram of the commonly used automobile turn signal controller. exist figure 1 Among them, flash controller 1' mainly includes f...

AI Technical Summary

Problems solved by technology

[0008] Due to the needs of energy saving, more and more car turn signals currently use LED lights (a small current lamp load), and the load current of LED lights can be as small as 0.3A or less. Still taking the 12V voltage system as an example, take the LED current as a constant current of 0.4A. Under the voltages of 9V, 12V, and 16V, the total current of the unilateral turn signal is 2.27A, 2.57A, and 2.97A. When a fault occurs, the fault currents are 1.87A, 2.17A, and 2.57A under the voltages of 9V, 12V, and 16V. Because the total current of the unilateral turn signal alternates with the fault current, it is impossible to select a suitable sampling value for the voltage of 9V ~ 16V. Realize fault identification of LED main lights within a certain range

[0009] Therefore, the flash controller of the prior art cannot identify the open-circuit fault of the small current turn signal lamp within the working voltage range of the automobile, thereby causing the limitation of the flash controller.

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