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Welcome to the website of Guangzhou Songge Electromechanical Equipment Co., Ltd.

松格机电

Professional generator set manufacturer sales lease maintenance

minshencao@hotmail.com Songge Electromechanical Consulting Hotline 020-84851836 minshencao@hotmail.com

Contact Songge Mechanical

Contact Songge Mechanical

Cummins generator set-Yuchai generator set-Silent diesel generator-Guangzhou Songge Mechanical and Electrical Co., Ltd.

020-84851836 Consulting Hotline: 020-84851836

曹先生 Contact: Mr. Cao

13609022338 Mobile: 13609022338

020-34865288 Fax: 020-34865288

342958639@qq.com Email: 342958639@qq.com

广东省广州市沙湾镇大涌口第二工业区1号 Address: No. 1 Second Industrial Zone, Dayongkou, Shawan Town, Guangzhou City, Guangdong Province

Automobile generator troubleshooting method

Everyone still remembers that in junior high school physics, the teacher said that the engine cuts the magnetic lines of force to generate electric current. This is also the working principle of the generator used in our cars. The earliest generators for automobiles consisted of generators and external regulators. External regulators were mainly used to stabilize the voltage of the generator at 12V. With the development of electronic technology, today's generators have been combined into one, and the current was directly used for excitation. Power supply, up to the current duty cycle control power supply. The excitation of the generator is provided by the main line of the generator, and the excitation state of the generator is activated by J519. After J519 and the generator trigger the excitation harness to break, the generator cannot complete the power generation under the idle state. When the number of revolutions reaches 2,000, the generator's excitation can be activated by the remanence in the generator and the magnetic field formed by the high speed in the generator to generate electricity. Once activated, it will continue to generate power (only one cycle of activation excitation can ) Until the generator stops rotating, if the vehicle is idling for a long time and the generator cannot generate electricity, the battery is exhausted.

Common generator failure phenomena:

1. The battery suddenly alarms when the vehicle is driving.

2. When the vehicle is running at idle, the vehicle stops and cannot start again. Check the battery for power loss. After the auxiliary start, it was found that the air conditioner was not cooling, and sometimes the blower could not run, and after the vehicle was turned off, it could not start due to power loss.

3. The indicator light on the instrument sometimes flashes.

Control of terminal "DFM"

This line is the monitoring line for the on-site management of the generator connected to the engine computer. It transmits a duty cycle signal. The engine monitors the generator voltage based on this signal. If the voltage is low, the engine's electronic control system will control the engine to increase the engine speed. Increase power generation.

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Control of terminal "L":

Vehicle power supply models with start-stop system

The purpose of load management is: in order to ensure that the battery has enough power to make the engine start smoothly and run normally.

Management method: The control unit evaluates according to the following relevant data:

① Engine speed

② Battery voltage

③ Generator's DF signal (01-08-53) Under the premise of ensuring safety, properly shut down the power-consuming equipment with comfort functions.

Inspection of common failure phenomena:

A. Turn on the ignition switch. The indicator light of the generator is normally on. When it is off, the possible reasons are:

1. Check if the L wire is open or shorted to the positive pole

2. Check if the generator is damaged

3. Inspect the instrument for damage

B. The indicator light of the instrument generator is normally off after starting the engine. Possible reasons when it lights up:

1. Check if the L line is shorted to ground

2.Check if SA1 fuse is broken or not connected

3. Check if the generator is damaged

4. Inspect the instrument for damage

Battery charging status of generator:

1.No check method for battery charging

a. When stepping on the accelerator and charging the battery after increasing the speed, check whether the excitation signal is normal (such as the plug is disconnected, the L line is open, and the ground is short-circuited)

b. Always charge the battery, check whether the generator is damaged, and whether the charging line from the generator to the battery is normal

2. Charging the battery, but the charging method is insufficient

a.Check if the tension of the V-belt is normal.

b. Check the voltage loss between generator B + and the battery positive electrode, and between the generator case and the battery negative electrode, and whether there is contact resistance.

3. Charge the battery, but the voltage is too high.

a 、 Check whether the generator is damaged

The above is the content for everyone, I hope to help everyone.