Automobile steering lamp flashing controller and control method thereof

Abstract

The invention discloses a flash controller of an automobile steering lamp and a controlling method of flash controller. The controller is internally provided with an MCU controlling circuit, a voltage and current sampling circuit and a controlling interface which sets and saves voltage and current characteristics with specific load. The invention can save current parameters under specific voltage loaded by the steering lamp within a working voltage scope of the controller, and adjusts the parameters according to different requirements of the steering lamp loads so as to distinguish open circuit failures of the steering lamp loads (such as an LED lamp load) with small current within the working voltage scope, avoid the disadvantage caused by that the conventional flash controller cannot distinguish the difference in lamp load with small current within the working voltage scope, realize flash of steering signals and main lamp failure indication required by the automobile and meet the functional requirement of the load with small current applied in the automobile steering lamp. The invention is characterized by 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 is a schematic diagram of a commonly used automotive turn signal controller. In Fig. 1, the flash controller 1' mainly includes a special flash contro...

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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