Diesel generator set controller
Diesel generator set controller
Diesel generator controller is the core of the generator, the equivalent of the human brain.Standard is defined as: according to the predetermined order change of main circuit and control circuit wiring and electrical resistance change circuit to control the start of the generator, speed, braking and reverse the main unit.By the program counter, instruction register and instruction decoder, timing generator and operation controller, it is a command decision-making body, coordination and command to complete the operation of the entire computer system controls the overall operation of the generator set.
The development history of the controller
Generator set control automation, has experienced the relay control, PLC (programmable logic controller) control and intelligent control three stages, starting at the end of the last century gradually controlled by microcomputer and electronic components of intelligent controller, will be very complex peripheral circuit integration in a module, greatly simplifies the control circuit, reliability has been improved, now the controller designed tend to be more intelligent, more human, there are also some generator manufacturers in the production of small gasoline engine all-in-one, practical and convenient.
The technology principle
In diesel engine cylinder, after air filter to filter the clean air and nozzle jet of high pressure atomized diesel hybrid, under the extrusion of the piston upward, shrinkage, temperature rise rapidly, to achieve the diesel ignition point.Diesel was lit, intense combustion gas mixture, the volume rapidly expand, pushing the piston downward, known as "work".Each cylinder in a certain sequence work, effect on the piston thrust through connecting rod into promoting the power of the crankshaft, so as to drive the crankshaft rotation.
On a generator can be divided into two parts - control unit and perform parts.Generator controller is the control unit and the arithmetic unit, memory, peripheral equipment, is perform component relative to the controller.A contact control unit and perform parts through the line of control.Control unit through the line of control to perform component of various control commands, the control command is called micro command, usually perform component and accept after micro command execution, the operation is known as micro operations.Between control unit and perform parts of another kind of contact is the feedback information.Execution parts through feedback line to control parts reflects the operating situation, in order to make the control unit according to the state of execution parts to new orders, this is also called the state test.Micro operations in the execution unit is the basic set of operations.Due to the structure of the data path, micro operations can be divided into two kinds of, compatibility and receptivity.
In a CPU of the machine cycle, a group to achieve a certain operation function of micro command combination, constitute a micro instruction.General microinstruction format consisting of operation control and sequence control.Operation control part used to signal management and command control of the whole machine working.The order control part used to determine the next microinstruction address.In fact the function of a single machine instruction is made up of many micro instruction sequence.The micro instruction sequences are usually called microprogram.Since the microprogram is consists of micro instruction, so when the execution of the current a micro instruction.It must be noted that the subsequent microinstruction address, so that the current a micro instruction execution is completed, remove a micro instruction execution.
Function is introduced
Receive and identify command: CPU can send a number of different commands to the controller, the equipment controller should be able to receive and identify these commands.Therefore, in the controller should have corresponding control register, used to store the received command and parameters, and decoding for the received command.Disk controller can receive the CPU, for example, Read, Write, and the Format of the article 15 different commands, and some command with parameters;Accordingly, in the disk controller has multiple registers and command decoder, etc.
Address recognition: just like the memory of each unit has an address, each device in the system also has an address, and device controller must be able to identify it controlled by the address of each device.In addition, in order to make the CPU to (or from) to write (or read) register data, these registers should be has a unique address.
There are two due to the controller design method and structure are also different.Micro operations refers to the operation, and decomposition of micro operations always need the corresponding control signal (called micro control signal or micro operation command).
Data buffer: due to the low rate of I/O devices and the rate of CPU and memory is very high, so you must set up a buffer in the controller.In the output, with the high-speed data from the buffer staged by the host, and then to the rate at which I/O devices have to transfer the data in the buffer to the I/O devices;When the input buffer is used for temporary data from I/O devices, after being received a batch of data, then the data in the buffer and transmitted to the host at a high speed.
Error control: device controller is in charge of by I/O device transmits the data error detection.If discover error has occurred in the transfer of, usually to setting the error detection code, and report to the CPU, so the CPU will transfer to the time of invalid data, and to transmit at a time.This can ensure the correctness of the data input.
Status: identify and report the status of equipment controller should take down the state of the equipment for the CPU.For example, only send when the device is in the ready state, the CPU can start controller read data from the device.To this end, a status register shall be set up in the controller, with each one of them to reflect the device of a certain state.When the CPU reads the contents of the register, you can understand the status of the device.
Data exchange: this refers to between the CPU and controller, data exchange between the controller and equipment.For the former, is through a data bus, the data to the controller by the CPU in parallel, or parallel to read data from the controller;Is equipment for the latter, the data input to the controller, or from the controller to the equipment.Therefore, in the controller must set the data register.
Protection Settings
Variety complete, the differential protection device, special varieties complete, can satisfy all kinds of all sorts of all sorts of equipment protection requirement of the sub-station, that gives up sub-station design and computer networking provides a great convenience
Hardware using the latest chips to improve the technical sophistication, using 80 c196kb CPU, measurement for 14 A/D conversion, analog input circuit as many as 24 road, collect the data using signal processing chip of DSP processing, using the fast Fourier transform, get the fundamental wave to 8 times harmonic, special software automatic correction, ensure the high precision of measurement.Using dual port RAM and CPU transform data, constitute a multiple CPU system, communication by CAN bus.Has high communication rate (up to 100 MHZ, generally run in 80 or 60 MHZ) strong anti-interference ability, etc.By keyboard and LCD display unit can be convenient for field observation and various protection methods and protection setting of parameters.
Hardware design in the power supply, analog input, switch input and output, and the communication interface of isolation and the special anti-interference measures, such as strong anti-jamming capability, in addition to the focus group screen, can be installed directly on the switch cabinet.
Software function is rich, in addition to complete all kinds of measurement and protection function, with the upper computer matching, can complete the fault wave record (1 SEC on high speed dynamic record fault recording and 9 seconds), harmonic analysis and the small current grounding line selection, etc.
CAN choose RS232 and CAN communication mode, support for multiple remote transmission protocols, convenient and a variety of computer management system connected to the Internet.
The wide background of temperate 240 x 128 LCD liquid crystal display screen, easy to operate, display and beautiful.
Apply to industry
Leasing industry applications: management provides the perfect solution two leased out through PC remote management unit, to monitor all operation parameters (pressure, temperature, voltage, current, power, etc.), may at any time change the configuration in order to protect the unit by improper application, can record 200 article detailed fault information, including: the fault time, reason, at the time of voltage, current, power, oil pressure, water temperature and other key parameters, and can be uploaded to the monitoring machine at any time.Another item multilevel password management for lease management;
Fire pump industry applications: close the electric parameter measurement, using a powerful programmable input/output ports and internal programmable logic to realize automation of water pump control system.Instead of the traditional PLC + simple way of diesel engine controller.Make the system more stable and reliable.
Air compressor industry applications: shut down voltage measurement protection, according to the need to configure the programmable analog input, using overload protection, cooperate with programmable digital input, complete the start control, temperature and pressure control, protection of parameter Settings, and so on.
