Current compensation method and system of vehicle lamp controller

Abstract

The invention discloses a current compensation method of a vehicle lamp controller. A to-be-measured vehicle lamp controller channel and a target output current of a to-be-measured function in the channel are selected; replacing the actual maximum load with an electronic load, and measuring the actual current with test equipment; calculating a current compensation value, and sending the current compensation value to the vehicle lamp controller through the CAN diagnosis equipment; after receiving the current compensation value, the vehicle lamp controller judges whether the sum of the current compensation value and the actual current value exceeds the maximum allowable value or not, and if not, the compensation value is updated; the vehicle lamp controller adjusts the output current according to the target output current and the compensation value; the invention also discloses a system used by the current compensation method of the vehicle lamp controller. Calibration is carried out according to the vehicle lamp functions, the currents corresponding to all the vehicle lamp functions are calibrated and stored respectively, special calibration compensation currents are used for different vehicle lamp functions, it is ensured that the deviation between the actual output current and the target current is smaller, and the number of defective products with the currents exceeding the design range is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle lamp controller, and particularly relates to a current compensation method and system of a vehicle lamp controller. BACKGROUND

[0002] The front headlamps and tail lamps on an automobile have left and right lamps, which are respectively controlled by left and right vehicle lamp controllers. The brightness difference between the left and right vehicle lamps of the same vehicle needs to be controlled within a range that cannot be perceived by the human eye. The brightness of the vehicle lamp mainly depends on the output current of the controller channel where the LED is located. In order to reduce the brightness difference of the vehicle lamp, the output current of the controller channel where the LED is located needs to be controlled within the allowed deviation range.

[0003] In the design process of the vehicle lamp controller, in order to reduce the cost, the number of current channels is reduced, and one vehicle lamp control channel is shared by one or more functions such as low beam, high beam, turn signal, daytime running lamp and position lamp. Therefore, there are multiple target output currents in one channel of the vehicle lamp controller.

[0004] The current mainstream compensation method is to compensate for the maximum target output current in the channel, and the other target output currents in the same channel are also compensated using the maximum target output current compensation value, which results in a larger deviation between the actual output current and the target output current in the shared channel, and even exceeds the allowed deviation range, thereby causing the LED brightness to be inconsistent. SUMMARY

[0005] The present application aims to provide a current compensation method for a vehicle lamp controller to solve the problems raised in the background art. The current compensation method for a vehicle lamp controller provided by the present application has the characteristic of ensuring that the actual output current is within the allowed error range.

[0006] Another object of the present application is to provide a system used by the current compensation method for a vehicle lamp controller.

[0007] To achieve the above object, the present application provides the following technical solution: a current compensation method for a vehicle lamp controller, comprising the following steps:

[0008] S1, selecting a vehicle lamp controller channel to be measured and a target output current of a function to be measured in the channel;

[0009] S2, using an electronic load to replace the actual maximum load, and using a test device to measure the actual current;

[0010] S3, calculating the current compensation value by the test device and sending it to the vehicle lamp controller through a CAN diagnostic device;

[0011] S4, after the vehicle lamp controller receives the current compensation value, determining whether the current compensation value + the actual current value exceeds the maximum allowed value, and if not, updating the compensation value.

[0012] S5. The headlight controller adjusts the output current according to the target output current and the compensation value.

[0013] In this invention, in S2, the electronic load is an NGI N61100 type electronic load.

[0014] In a further step of this invention, in S2, the resistance of the electronic load is adjusted so that the resistance of the electronic load is the resistance of the LED under test.

[0015] In this invention, in step S2, the testing device is a Hall current sensor.

[0016] In this invention, further, in S3, the formula for calculating the current compensation value is: ΔI=I i -I j Where ΔI represents the current compensation value, I i Indicates the target output current; I j This represents the actual output current.

[0017] In this invention, further, in S4, the logic for determining whether the current compensation value + actual current value exceeds the maximum allowable value is as follows: the vehicle light controller compares I... j +ΔI and I max The relationship, if I j +ΔI≥I max If I j +ΔI<I max Then update the current compensation value in Flash, the new current compensation value I k =I l +ΔI, where I max For the maximum allowable current of the channel, I k For the new current compensation value, I l This is the original current compensation value.

[0018] Furthermore, in this invention, the system used in the current compensation method for a vehicle lighting controller includes a vehicle lighting controller, an electronic load, a testing device, and a CAN diagnostic device. The electronic load is connected to the output channel of the vehicle lighting controller, the testing device is used to test the current flowing through the electronic load, and the CAN diagnostic device is used to enable communication between the testing device and the vehicle lighting controller.

[0019] In this invention, the electronic load is further described as an NGI N61100 type electronic load.

[0020] In this invention, the testing device is a Hall current sensor.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention calibrates according to the vehicle light function, calibrates and stores the current corresponding to each vehicle light function separately, and uses a dedicated calibration compensation current for different vehicle light functions to ensure that the actual output current deviates less from the target current, thereby reducing the number of defective products with current exceeding the design range.

[0023] 2. The current corresponding to each vehicle light function in this invention can be individually calibrated and compensated.

[0024] 3. This invention can eliminate defective products caused by current exceeding the design range, thus improving the yield rate.

[0025] 4. The actual current of the vehicle light function of this invention is more consistent with the target current, and the brightness of the lights on different vehicles is more consistent. Attached Figure Description

[0026] Fig. 1 This is a block diagram of the method of the present invention.

[0027] Fig. 2 This is a system block diagram of the present invention.

[0028] In the diagram: 1. Headlight controller; 2. Electronic load; 3. Testing equipment; 4. CAN diagnostic equipment. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figs. 1-2 The present invention provides the following technical solution: a current compensation method for a vehicle headlight controller, comprising the following steps:

[0031] S1. Select the vehicle lighting controller channel to be measured and the target output current of the function to be measured in the channel;

[0032] S2. Use an electronic load to replace the actual maximum load and use testing equipment to measure the actual current.

[0033] S3. Calculate the current compensation value using the testing equipment and send it to the vehicle lighting controller via the CAN diagnostic equipment;

[0034] S4. After receiving the current compensation value, the headlight controller determines whether the sum of the current compensation value and the actual current value exceeds the maximum allowable value. If it does not exceed the maximum allowable value, the compensation value is updated.

[0035] S5. The headlight controller adjusts the output current according to the target output current and the compensation value.

[0036] Specifically, in S2 of this invention, the electronic load is an NGI N61100 type electronic load.

[0037] Specifically in this invention, in S2, the resistance of the electronic load is adjusted so that the resistance of the electronic load is the resistance of the LED under test.

[0038] Specifically, in S2 of this invention, the testing device is a Hall current sensor.

[0039] Specifically, in this invention, in S3, the formula for calculating the current compensation value is: ΔI=I i -I j Where ΔI represents the current compensation value, I i Indicates the target output current; I j This represents the actual output current.

[0040] Specifically, in S4 of this invention, the logic for determining whether the current compensation value plus the actual current value exceeds the maximum allowable value is as follows: the headlight controller compares I... j +ΔI and I max The relationship, if I j +ΔI≥I max If I j +ΔI<I max Then update the current compensation value in Flash, the new current compensation value I k =I l +ΔI, where I max For the maximum allowable current of the channel, I k For the new current compensation value, I l This is the original current compensation value.

[0041] Please see Fig. 2 The present invention also provides the following technical solution: a system used in a current compensation method for a vehicle lighting controller, comprising a vehicle lighting controller, an electronic load, a testing device and a CAN diagnostic device, wherein the electronic load is connected to the output channel of the vehicle lighting controller, the testing device is used to test the current flowing through the electronic load, and the CAN diagnostic device is used to realize communication between the testing device and the vehicle lighting controller.

[0042] Specifically, in this invention, the electronic load is an NGI N61100 type electronic load.

[0043] Specifically, in this invention, the testing device is a Hall current sensor.

[0044] In summary, this invention calibrates according to vehicle light functions, calibrating and storing the current corresponding to each function separately. Different functions use dedicated calibration and compensation currents to ensure a smaller deviation between the actual output current and the target current, reducing the number of defective products with current exceeding the design range. The current corresponding to each vehicle light function can be individually calibrated and compensated. This invention can eliminate defects caused by current exceeding the design range, improving the yield rate. Furthermore, the actual current of the vehicle light functions is more consistent with the target current, resulting in better consistency in light brightness across different vehicles.

[0045] Example 1

[0046] The table below shows the current data of the multi-channel vehicle lighting controller after current correction according to the output target of each function:

[0047]

[0048] Comparative Example 1

[0049] The table below shows the current test data for the multi-channel headlight controller before calibration:

[0050]

[0051]

[0052] Comparative Example 2

[0053] The table below shows the current test data for the multi-channel vehicle lighting controller after channel calibration:

[0054]

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A current compensation method for a vehicle lighting controller, characterized in that, Includes the following steps: S1. Select the vehicle lighting controller channel to be measured and the target output current of the function to be measured in the channel; S2. Use an electronic load to replace the actual maximum load and use testing equipment to measure the actual current. S3. Calculate the current compensation value using the testing equipment and send it to the vehicle lighting controller via the CAN diagnostic equipment; S4. After receiving the current compensation value, the headlight controller determines whether the sum of the current compensation value and the actual current value exceeds the maximum allowable value. If it does not exceed the maximum allowable value, the compensation value is updated. S5. The headlight controller adjusts the output current according to the target output current and the compensation value.

2. The current compensation method for a vehicle lighting controller according to claim 1, characterized in that: In S2, the electronic load is an NGI N61100 type electronic load.

3. The current compensation method for a vehicle lighting controller according to claim 1, characterized in that: In step S2, the resistance of the electronic load is adjusted so that it is equal to the resistance of the LED under test.

4. The current compensation method for a vehicle headlight controller according to claim 1, characterized in that: In S2, the testing device is a Hall current sensor.

5. The current compensation method for a vehicle lighting controller according to claim 1, characterized in that: In S3, the formula for calculating the current compensation value is: ΔI=I i -I j Where ΔI represents the current compensation value, I i Indicates the target output current; I j This represents the actual output current.

6. The current compensation method for a vehicle lighting controller according to claim 1, characterized in that: In S4, the logic for determining whether the current compensation value plus the actual current value exceeds the maximum allowable value is as follows: the headlight controller compares I... j +ΔI and I max The relationship, if I j +ΔI≥I max If so, the original current compensation value remains unchanged; If I j +ΔI<I max Then update the current compensation value in Flash, the new current compensation value I k =I l +ΔI, where I max For the maximum allowable current of the channel, I k For the new current compensation value, I l This is the original current compensation value.

7. The system used in the current compensation method for a vehicle lighting controller according to any one of claims 1-6, characterized in that: It includes a vehicle lighting controller, an electronic load, a testing device, and a CAN diagnostic device. The electronic load is connected to the output channel of the vehicle lighting controller, the testing device is used to test the current flowing through the electronic load, and the CAN diagnostic device is used to enable communication between the testing device and the vehicle lighting controller.

8. The system used in the current compensation method for a vehicle lighting controller according to claim 7, characterized in that: The electronic load is an NGI N61100 type electronic load.

9. The system used in the current compensation method for a vehicle lighting controller according to claim 7, characterized in that: The testing equipment is a Hall current sensor.

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