What does the diesel genset controller do?

Diesel generator sets are equipped with an LCD control module, which is an intelligent controller to protect and monitor the operation of the generator set. What does it do for the protection of generators? The following generator manufacturers will tell you:

The intelligent controller inputs signals through various probes and displays them on the screen through the LCD control module. Such as voltage, current, running time, oil pressure, water temperature, three-phase voltage, phase current, frequency, power and other parameters according to the different models of the module to achieve the function of the function of the increase or decrease. At the same time, it can give a positive alarm to the abnormal operation of the generator, such as high water temperature alarm, low oil pressure alarm, etc., and the generator will be automatically shut down to achieve the purpose of protecting the generator set if the fault is serious.

Control the start and shutdown of diesel generator sets, and protect the normal operation of generator sets. The automation performance of the generator set is also very related to the liquid crystal control module.

According to the way of control and operation, it can be divided into on-site operation generator sets, compartment operation generator sets and automatic generator sets.

1) On-site operation of the generator set. The operator starts, closes, regulates speed, opens, and stops the generator set in the machine room. The vibration, noise, oil mist and exhaust gases generated by the operation of this type of generator set have adverse effects on the health of the operator.

2) The compartment operates the generator set, the machine room and the control room of this kind of generator set are set up separately, and the operator starts, regulates the speed, stops and other operations of the diesel generator set in the machine room in the operation room, and monitors the operating parameters of the unit, and implements centralized control of the auxiliary equipment in the machine room. Compartment operation improves the working environment for the operator.

3) Automatic generator set. After years of research by all relevant units, the automation of diesel generator sets can be unattended, including unit self-starting, automatic voltage regulation, automatic frequency regulation, load regulation, automatic merging, automatic increase or decrease of units according to the load size, automatic fault handling, automatic recording The printer group can be automatically started in 10-15s after the mains power interruption, replacing the mains power for power supply.

The automatic control cabinet of diesel generator set (as shown in the figure below) generally has the following functions:

1. Reliable design and stable debugging;

2. Safe line layout, in accordance with electrical specifications;

3. The liquid has strong versatility and is suitable for the control of many different models and different capacities at home and abroad;

4. With microprocessor as the core, large-screen LCD with backlight Chinese display, touch button operation;

5. Accurate measurement and display function: real-time monitoring of electrical parameters, water temperature and oil pressure of diesel generator set and mains;

6. Control and protection function: realize the automatic start-up and shutdown, load switching and alarm protection functions of diesel generator set;

7. Parameter setting function: allow the user to change the parameter setting, and at the same time remember it in the internal flash memory, and it will not be lost when the system is powered off;

8. It has the function of automatic control of intake and exhaust damper (realized through the programming output port);

9. A variety of temperature and pressure sensors can be used directly, and the parameters can be customized;

10. It has the functions of real-time calendar, clock and running time accumulation;

11. The cumulative output power of the generator set is displayed;

12. A variety of successful starting conditions are available;

13. Built-in speed frequency detection link, which can accurately judge the success of starting, rated operation and overspeed status;

14. 99 groups of historical records can be kept in cycle, and the records can be queried on the spot;

15. The power supply range of alarm key fast power supply is wide (8 35) VDC, which can adapt to different starting battery voltage environments.

The control panel of the diesel generator set has an ordinary unit control panel and an automatic control panel. The ordinary control panel is suitable for the control of ordinary diesel generator sets, and the start-stop, power supply and shutdown, and status adjustment of the unit are all operated manually; The automatic control panel is suitable for the control of automatic diesel generator sets, and the start-stop, power supply and shutdown, and status adjustment of the unit can be completed manually or automatically. The following is how to start the control screen of the diesel generator set.

1. "Unit controller": This module is the control center for unit start and self-starting, and has the function of detecting unit parameters and protection, please refer to the controller instruction manual for detailed instructions.

2. "Mains indicator" light: When the normal unit of mains power is in standby mode, the light is on.

3. "High-speed and low-speed" transfer switch: when the unit chooses to start manually, after the electric key is successfully started, the twist switch can be used to control the idle speed or high-speed operation of the unit.

That is, the switch is in the "low-speed" position, and the unit is in idle operation, and when switched to the "high-speed" position, the unit is in high-speed operation.

After observing that the power generation is normal, use the ATS conversion handle to manually switch the dual power switch to the power generation side to send the power generation out.

4. "Power start" key switch: The key switch is divided into two gears, the first gear is the 24V power supply on state, and the second gear is the unit start state when the second gear is torsional.

5. "Manual automatic" transfer switch: The twist switch is a manual start or automatic start selection switch for the unit.

1) When selecting manual, first put the high-speed low-speed twist switch in the low-speed position, start the generator set with the key, and after idle operation for a period of time, convert the high-speed low-speed twist switch to the high-speed position.

After observing the normal operation of the generator set, put the key on the ATS in the manual state, and use the ATS handle to switch the dual electric power switch to the power generation side, so as to send the power generation out.

Note: Be sure to manually switch after the unit generates electricity normally, and it is forbidden to forcibly switch the switch in the state of no electricity.

2) When the transfer switch is selected in automatic, put the controller in the AUTO position, once the mains stops, the unit will automatically start and automatically send power: you can also manually press the green button on the controller by hand, the unit will start, and the power will be automatically transmitted.

6. "Emergency stop" button: If there is a special situation, when the unit is running, the emergency stop operation can be completed by pressing the button.

The main purpose of the control panel is to distribute the electrical energy output from the generator to the user load or electrical equipment, and also to indicate the operation of the diesel generator and keep the voltage of the generator stable in the case of load changes. The control panel is generally equipped with voltmeter, frequency meter, ammeter, power meter, three-phase current transfer switch, three-phase voltage transfer switch, voltage setting knob and various indicator lights. For the oil pressure gauge, oil temperature gauge, battery charging ammeter, water temperature gauge, start button and starting electric lock and other components, some are directly installed on the control panel panel according to the design requirements, and some are installed on the diesel engine dashboard.

The components installed inside the control panel are mainly related to the excitation method adopted by the generator and the automatic control of the diesel engine. The internal structure of the diesel generator set control panel.

The simple control panel is generally installed with voltage regulators, silicon rectifier diodes, rheostats, automatic air switches and current transformers and other components, and the more complex control panels are also installed with overload and short circuit protection devices, electronic governors, thyristors, relays and various safety devices and small transformers and other electrical equipment.

The diesel engine electronic control system consists of three parts: sensors, control units (ECUs) and actuators.

The main function of the sensor is to detect the operating status and operation volume of the diesel engine and vehicle in real time, and convert it into an electrical signal and transmit it to the control unit. The main sensors of the diesel engine electronic control system include engine speed sensor, shank position sensor, fuel injection advance angle sensor and accelerator pedal position sensor.

The main function of the control unit is to receive and process the input information, execute the program, and output the operation results to the actuator as control instructions. In addition, there is a communication function, that is, with other control systems - such as transmission controller for data transmission and exchange, while taking into account the real-time situation of other systems, appropriate correction of the fuel system execution instructions, that is, appropriate correction of fuel injection volume, injection advance angle, etc. At the same time, the necessary information can be sent to other control systems.

The main function of the actuator is to adjust the corresponding mechanism of fuel injection volume and fuel injection timing according to the instruction sent by the control unit, so as to adjust the running state of the diesel engine. The main control quantities of the electronically controlled diesel injection system are the amount of fuel injected and the timing of the injection. In in-line pump systems, there are governor actuators (which adjust the displacement of the stilt of the fuel injection pump) and advance actuators (which adjust the phase difference between the engine drive shaft and the fuel injection pump camshaft to adjust the injection time), and there are also some unique actuators in the distribution pump system.

There are ways to detect deflagration of gasoline engines on automobiles.

The main control functions include fuel injection control, intake control, idle speed control, exhaust gas recirculation control, exhaust gas turbocharging pressure control, fault self-diagnosis and failure protection control.

1 Fuel Injection Control.

Fuel injection control mainly includes fuel injection volume control, fuel injection timing control, fuel injection law control, as well as the control of uneven fuel injection volume of each cylinder, fuel injection pressure control and other control contents.

1) Fuel injection volume control.

The electronic control unit takes the speed sensor and the throttle position sensor and the accelerator pedal position sensor input the diesel engine speed and load as the basic control parameters, determines the basic circulating fuel injection amount, and then corrects it according to other relevant input signals, and finally determines the actual circulating fuel supply (injection) volume.

2) Fuel injection timing control.

The electronic control unit takes the diesel engine speed and load input by the speed sensor and the throttle position sensor and the accelerator pedal position sensor as the basic control parameters to determine the basic fuel supply (injection) timing and realize the closed-loop control of the fuel injection timing.

3) Control of fuel injection rules.

Fuel injection law control is the law of the rate of injection and the amount of fuel injected over time.

4) Control of uneven fuel injection volume of each cylinder.

The electronic control unit takes the allowable deviation of speed fluctuation between cylinders as the control target value, and corrects the fuel injection amount of each cylinder.

2 Air intake control.

Intake control includes variable intake vortex control, variable valve timing control, intake throttling control, and intake preheating control.

3 Idle speed control.

Idle speed control mainly includes idle speed stability control and control of the working uniformity of each cylinder at idling.

4. Exhaust gas recirculation control.

The purpose of exhaust gas recirculation control is to reduce NOx emissions in the exhaust gas. Exhaust gas recirculation control includes the determination of exhaust gas recirculation conditions and the control of exhaust gas recirculation amount.

5 Exhaust gas turbo pressure control.

There are two main control methods: wastegas bypass channel control and turbine flow section control.

6. Fault self-diagnosis and fail-safe control.