Shanghai XinCheHui Industrial Co

Shanghai Xinchehui Industrial Co., Ltd. is a modern automobile repair service enterprise that integrates high-end car modification, maintenance, repair services, information feedback, car insurance services, and more.
A BMW sedan with a mileage of about 10,000 years. Customers reported that the daytime running lights installed on the car sometimes did not light up.
After inspection and analysis by Xinchehui maintenance personnel, the maintenance personnel tested the car and found that the failure occurred frequently after the car was driven for a certain distance while hot.
Execute the test and no relevant fault memory exists. Check the daytime running light circuit installed by the user to see if there are no short circuits, open circuits or functional problems
. By understanding the working principle of this daytime running light kit, we know that it controls the lighting on and off by detecting the vehicle's power supply voltage. When the engine is stationary, the power supply voltage usually does not exceed the limit. After the daytime running lights are turned off and the engine is running, the power supply voltage reaches about 0.0, and the daytime running lights
turn on.
Considering this control method of the daytime running light kit, the maintenance personnel suspected that it contradicted the power management system of the model.
The vehicle model’s intelligent generator adjustment system is integrated into the engine control unit in the form of software. What is different from the traditional charging regulation method is that the intelligent generator regulation device has a certain charging strategy. Since the vehicle has an energy recovery system, the battery no longer uses the power of the engine to be fully charged, but only to the maximum value. In this way, when the vehicle decelerates, the vehicle's inertia can be used to charge the battery.
In this intelligent generator regulation system, the generator works at low voltage for a relatively long time. Only when the system regularly disables the intelligent generator adjustment function can the battery be charged so that the battery can fully recover its capacity. It can be seen from the voltage change pattern of the system that the vehicle's power supply voltage is changing, which is not seen in traditional power management systems.
Based on the analysis of the working principle of the vehicle and the control method of the driving light kit, the maintenance personnel believe that when the vehicle's power supply voltage is low, the driving lights will turn off
Measuring the power supply voltage of the vehicle, it was found that the driving lights were indeed turned off when the voltage was low, proving that this inference was established.
Troubleshooting Explain clearly the cause of the fault to the customer and explain that this retrofit kit is not suitable for vehicles with functions. With the customer's consent,
the kit will be dismantled. The problem is solved.
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