Headlight controller based on hard wire control

Abstract

The utility model relates to the technical field of vehicle control, and discloses a headlight controller based on hard wire control, which comprises a power supply management chip, a microprocessor, a power supply filter circuit, a boost-buck chip and a dipped headlight LED (light-emitting diode) interface, a second pin of the power supply management chip is connected with a dipped headlight power supply of a vehicle body controller, leads of a first pin and the second pin of the power supply management chip are respectively connected with the power supply filter circuit, the microprocessor is in bidirectional connection with the power supply management chip, the power supply filter circuit and the microprocessor are both connected with the boost-buck chip, and the boost-buck chip is connected with the microprocessor. And the boost-buck chip is connected with the dipped headlight LED interface. According to the utility model, a hard wire control mode is adopted, the vehicle body controller directly provides a power supply for the dipped headlight for the headlight controller, and then the headlight controller executes the lightening control of the dipped headlight, so that the structure is simple, the cost is low, and the design of functional safety of the dipped headlight can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle control, in particular to a headlight controller based on hard-line control. Background Art

[0002] At present, the existing automobile headlight controller usually adopts the network control mode, and the control function is realized by connecting the CAN bus controller and the body controller separately. However, on the one hand, this connection mode of adding a transfer controller will increase the difficulty of wiring and weaken the stability of system construction. On the other hand, the transmission of communication between CAN bus nodes requires the input of additional control signals, which has a high production cost. Therefore, it is necessary to design a headlight controller that can be directly connected to the body controller. Utility Model Content

[0003] The purpose of the utility model is to provide a headlight controller based on hard-line control to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a headlight controller based on hard-wire control, connected to a vehicle body controller, comprising a power management chip, a microprocessor, a power filter circuit, a buck-boost chip and a low-beam LED interface, wherein pin one of the power management chip is connected to the ignition power supply of the vehicle body controller, pin two of the power management chip is connected to the low-beam power supply of the vehicle body controller, and the leads of pin one and pin two of the power management chip are respectively connected to the power filter circuit, the microprocessor is bidirectionally connected to the power management chip, the power filter circuit and the microprocessor are both connected to the buck-boost chip, and the buck-boost chip is connected to the low-beam LED interface.

[0005] The following improvements are made in the present application: the headlight controller further includes a thermistor NTC interface and a sub-BIN resistor interface, both of which are connected to a microprocessor. The voltages of the thermistor and the sub-BIN resistor interface are collected simultaneously by coordinating the microprocessor, the thermistor NTC interface and the sub-BIN resistor interface, thereby adjusting the current value output to the low beam.

[0006] In the present application, the following improvements are made: pin 3 of the power management chip is grounded together with the vehicle body controller. In the present application, the following improvements are made: a voltage collection branch is connected between the leads of pin 1 and pin 2 of the power management chip, and the voltage collection branch is connected to the microprocessor.

[0007] The following improvement is made in the solution of the present application: the microprocessor is provided with an SPI port, and the buck-boost chip is connected to the microprocessor via the SPI port.

[0008] The following improvements are made in the present application scheme: the power supply filter circuit includes a diode D1, an inductor L1, a capacitor C1, a capacitor C2 and a capacitor C3; the anode of the diode D1 is connected to the power input terminal, the cathode is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the power output terminal, one end of the capacitor C1 is connected between the power input terminal and the diode D1, one end of the capacitor C2 is connected between the diode D1 and the inductor L1, one end of the capacitor C3 is connected between the inductor L1 and the power output terminal, and the other ends of the capacitors C1, C2 and C3 are all grounded.

[0009] Compared with the prior art, the utility model provides a headlight controller based on hard-wire control, which has the following beneficial effects:

[0010] The utility model adopts a hard-line control method, in which the body controller directly provides the power supply of the low beam to the headlight controller, and then the headlight controller executes the low beam lamp, the power supply over-voltage and under-voltage current reduction, and the lamp board over-temperature current reduction. The utility model has a simple structure, low cost, and can meet the design of low beam function safety. The headlight controller is composed of a power management chip, a microprocessor, a power filter circuit, a buck-boost chip and a low beam LED interface. It is first connected to the external low beam board through the low beam LED interface. After the headlight controller receives the low beam power supply, the low beam power supply to the power management chip provides 5V power to the microprocessor. The microprocessor completes initialization, and the buck-boost chip is initialized again. The low beam limp mode is set to output. After the initialization is completed, the microprocessor starts voltage acquisition. When the low beam power supply voltage meets the low beam lighting requirement, the microprocessor sends a low beam lighting command to the buck-boost chip through SPI. The buck-boost chip is powered by the low beam power directly after filtering. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a system block diagram of the utility model;

[0012] Figure 2 This is the structural diagram of the power supply filter circuit.

[0013] In the figure: 1. Body controller; 2. Power management chip; 21. Pin 1; 22. Pin 2; 23. Pin 3; 24. Voltage acquisition branch; 3. Microprocessor; 31. SPI port; 4. Power filter circuit; 5. Buck-boost chip; 6. Low beam LED interface; 7. Thermistor NTC interface; 8. BIN resistor interface. DETAILED DESCRIPTION

[0014] The technical scheme in the embodiment of the present invention will be described below in conjunction with the accompanying drawings in the embodiment of the present invention:

[0015] like Figure 1-2 As shown, a headlight controller based on hard-line control is connected to a body controller 1, including a power management chip 2, a microprocessor 3, a power filter circuit 4, a buck-boost chip 5, a low-beam LED interface 6, a thermistor NTC interface 7 and a BIN resistor interface 8; wherein, pin 1 21 of the power management chip 2 is connected to the ignition power supply of the body controller 1, pin 2 22 of the power management chip 2 is connected to the low-beam power supply of the body controller 1, pin 3 23 of the power management chip 2 and the body controller 1 are grounded together, the microprocessor 3 and the power management chip 2 are bidirectionally connected, and a voltage collection branch 24 is connected between the leads of pin 1 21 and pin 2 22 of the power management chip 2, the voltage collection branch 24 is connected to the microprocessor 3, the microprocessor 3 is provided with an SPI port 31, the buck-boost chip 5 is connected to the microprocessor 3 through the SPI port 31, and at the same time, pin 1 21 and pin 2 2 2 are respectively connected to the power supply filter circuit 4, the boost-boost chip 5 is powered by the low-beam power supply directly through the power supply filter circuit 4, the power supply filter circuit 4 includes a diode D1, an inductor L1, a capacitor C1, a capacitor C2 and a capacitor C3, the anode of the diode D1 is connected to the power input terminal, the cathode is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the power output terminal, one end of the capacitor C1 is connected between the power input terminal and the diode D1, one end of the capacitor C2 is connected between the diode D1 and the inductor L1, one end of the capacitor C3 is connected between the inductor L1 and the power output terminal, the other ends of the capacitor C1, the capacitor C2 and the capacitor C3 are all grounded, and the power supply filter circuit 4 and the microprocessor 3 are all connected to the boost-boost chip 5, and the boost-boost chip 5 is connected to the low-beam LED interface 6; the thermistor NTC interface 7 and the BIN resistor interface 8 are all connected to the microprocessor 3.

[0016] Working condition 1: Normal operation

[0017] After the headlight controller receives the low beam power supply, the low beam power supply goes to the power management chip 2 to provide 5V power to the microprocessor 3, the microprocessor 3 completes initialization, the buck-boost chip 5 is initialized, and the low beam limp mode is set to output; after the initialization is completed, the microprocessor 3 starts to collect voltage, and when the low beam power supply voltage meets the low beam lighting requirement, the microprocessor 3 sends a low beam lighting command to the buck-boost chip 5 through SPI;

[0018] Condition 2: Functional safety of microprocessor failure when low beam LED is on

[0019] When the low beam is turned on, the microprocessor 3 fails, the voltage management chip 2 cannot receive a valid watchdog signal, and resets the microprocessor 3; the LHI of the buck-boost chip 5 is enabled, entering the limp home mode, the low beam power supply is high, and the low beam LED remains on.

[0020] Condition 3: Functional safety of microprocessor failure when the low beam LED is off

[0021] When the low beam is turned off, the ignition power supply is at a high level, the microprocessor 3 fails, the voltage management chip 2 cannot receive a valid watchdog signal, and resets the microprocessor 3; the LHI of the buck-boost chip 5 is enabled and enters the limp home mode. At this time, the ignition power supply is at a high level, the low beam power supply is at a low level, the buck-boost chip is powered normally, and the low beam LED is on.

[0022] The above embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A headlight controller based on hard-wire control, connected to a vehicle body controller (1), characterized in that: The invention comprises a power management chip (2), a microprocessor (3), a power filter circuit (4), a buck-boost chip (5) and a low-beam LED interface (6); a pin 1 (21) of the power management chip (2) is connected to an ignition power supply of a vehicle body controller (1); a pin 2 (22) of the power management chip (2) is connected to a low-beam power supply of the vehicle body controller (1); leads of pin 1 (21) and pin 2 (22) of the power management chip (2) are respectively connected to the power filter circuit (4); the microprocessor (3) and the power management chip (2) are bidirectionally connected; the power filter circuit (4) and the microprocessor (3) are both connected to the buck-boost chip (5); and the buck-boost chip (5) is connected to the low-beam LED interface (6).

2. A headlight controller based on hard-wire control according to claim 1, characterized in that: The headlight controller further comprises a thermistor NTC interface (7) and a sub-BIN resistor interface (8), and both the thermistor NTC interface (7) and the sub-BIN resistor interface (8) are connected to the microprocessor (3).

3. A headlight controller based on hard-wire control according to claim 1, characterized in that: Pin three (23) of the power management chip (2) and the vehicle body controller (1) are grounded together.

4. A headlight controller based on hard-wire control according to claim 3, characterized in that: A voltage collection branch (24) is connected between the leads of pin 1 (21) and pin 2 (22) of the power management chip (2), and the voltage collection branch (24) is connected to the microprocessor (3).

5. The headlight controller based on hard-wire control according to claim 1, characterized in that: The microprocessor (3) is provided with an SPI port (31), and the buck-boost chip (5) is connected to the microprocessor (3) via the SPI port (31).

6. A headlight controller based on hard-wire control according to claim 1, characterized in that: The power supply filter circuit (4) comprises a diode D1, an inductor L1, a capacitor C1, a capacitor C2 and a capacitor C3, wherein the anode of the diode D1 is connected to the power supply input terminal, the cathode is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the power supply output terminal, one end of the capacitor C1 is connected between the power supply input terminal and the diode D1, one end of the capacitor C2 is connected between the diode D1 and the inductor L1, one end of the capacitor C3 is connected between the inductor L1 and the power supply output terminal, and the other ends of the capacitors C1, C2 and C3 are all grounded.

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