The loop for heavy fuel oil is retained, as on mechanically controlled engines, i. Before commencing with the disassembly of the pump, cover the fuel in let, fuel outlets, and the return line connector and wash the pump with solvent and blow dry with filtered, compressed air. Pdf electronic control fuel injection system based on gt. Because the injection pump is controlled by the sprocket on the timing belt, doing a timing belt replacement job correctly is very important for. The techniques explored include variable fuel injection rate shaping, turbocompound cooling, regenerative recirculating cold start, variable injection timing, variable geometry.
Examples include the hydraulic electronic unit injector heui and the mechanically actuated electronically controlled meui systems by caterpillar, and a number of systems by cummins such as the accumulator pump system caps, quantum celect, hpi, and xpi injection systems. Hydraulic electronic unit injector the heui fuel system utilizes a hydraulically actuated electronically controlled unit injector 7. Electronic control allows you to control the injection of fuel more accurately to optimise the power delivery and fuel consumption compared to mechanically controlled engines. Some industrial diesel engines use multipoint fuel injection mpi similar to that used in most cars. This system consists of the unit injectors, fuel manifolds, electronic pressure regulator, high pressure fuel pump, electronic control unit, wiring harness, and engine sensors. At present, electronic control is an important direction in the field of diesel research. Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This video is the working principle animation of electronic fuel injection system. For producing the required pressure for atomizing the fuel either air or a mechanical means is used. Common rail system injection pressure control injection timing control injection rate control injection quantity control. Mpi systems utilize a single or dual fuel pumps to feed fuel injectors mounted in the intake port of the engine. The nozzle is only controlled exter nally by an electronic controller in the com monrail system. The injection pump fuel distributor assembly is driven by the timing belt, chain or gears which in turn drives the fuel pump. Many of them use a fuel pump essentially identical to the carbureted fuel systems.
Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. This system makes it possible to model any injection. The high injection pressures needed in the diesel fuel system result from close tolerances in the pumps and injectors. Like a carburetor, it must provide the engine with the correct air fuel mixture for specific operating conditions. Electronically controlled distributor type fuel injection system. Pdf new method to reduce no x emissions of diesel engines. Until the 1990s, mechanical pumplinenozzle fuel injection systems had been used with fixed injection timings and single injection. The shortcircuiting losses of the twostroke engine can be eliminated by directly injecting the fuel into the cylinder after the closure of the exhaust port. Fuel injection is provided by electronically controlled solenoid fuel injectors controlled by the ecm. The injectors spray fuel into the engines intake valves through the intake port. Electronically controlled fuel injection system for mixturecompressing, externally ignited internalcombustion engines, including at least one suction pipe connected via the intake valve path with at least one combustion chamber of the engine, an electrically controllable injection valve disposed at the suction pipe to supply the fuel, a measuring device effective in the suction pipe, and an. Operation,diagnosis,and service 673 figure 297 the vacuummodulated pressure regulator controls system fuel pressure with a springloaded diaphragm. Theoretical and experimental study of a hydraulically.
Airflow regulation continues to be achieved using a butterfly or a rotating valve, but an electronically controlled fuel injector delivers the required quantity of fuel. An electronically controlled fuel injection pump includes a control unit mounted on a pump body and having an internal cooling passage through which a fuel oil flows to cool electronic components of the control unit. Electronically controlled fuel injection system, common rail fuel injection system, single cylinder diesel engine, multiple injection. Pdf electronically controlled diesel engine uzma siddiqui. Effects of electronically controlled fuel injection system. And now, we will business you to try reading pdf as one of the reading material. The mechanical flyweight governors of inline and distributor diesel fuel injection pumps used to control fuel delivery in diesel engines under a variety of engine loads and conditions could no longer deal with the everincreasing demands for efficiency, emission control, power and fuel consumption. All the old model vehicle were equipped with carburetor for air fuel mixing and now im going to explain you electronic fuel injection system that has been. An electronically controlled engine has an electronic control unit ecu, monitoring what the engine is doing using a number of sensors its speed and the load on it and alters the fuel injection rate to give the right power as its needed. With the introduction of the ahualh engines, fueling became drive by wire, or electronically controlled. The start of injection regulation thus has the task of determining the correct point of fuel delivery and injection.
Petrol engines can use gasoline direct injection, where the fuel is directly delivered into the combustion chamber, or indirect injection where the fuel is mixed with air before the intake stroke. In this system, each cylinder is provided with one pump and one injector. Fuel injection is a system for admitting fuel into an internal combustion engine. In this study, the electronically controlled water steam injection esi system was introduced as a new method to reduce nox emissions. The commonrail system with piezo injectors by bosch enables the flexible injection of fuel at pressures up to 2,700 bar. Diesel common rail injection facts 1 diesel common rail injection facts 1 amazon printed books. Design and development of electronic fuel injection control system. Advanced diesel electronic fuel injection and turbocharging. Fuel system common rail fuel injection system consists of an ecm, primary fuel filterwater separator, waterin fuel. Fuel injection system an overview sciencedirect topics. However, in some cases, a mechanically controlled system could be sufficient for constant. By mapping the pump and the injector of 16v265h diesel engine, it comes to the conclusion of the structural parameters of the fuel injection system for electronic control unit pump.
In the program, the injection pump was replaced with the measured pressure at the junction between the pump and highpressure pipe. The need for technology to meet fuel economy and exhaust emission challenges drove improvements. The benefits of electronic fuel injection efi power4flight. Classification of injection systems a fuelinjection syystem is required to inject and atomize fuel in to the cylinder of ci engines. System overview figure 1 illustrates the configuration of an electronically controlled fuel injection system. Aug 20, 20 this video is the working principle animation of electronic fuel injection system. The recent introduction of an electronically controlled diesel fuel injection system on several heavyduty highspeed truck engines. This was done to optimize emissions, noise development, output and fuel. Diesel fuel injection system a major cost of the diesel engine. Pdf ci diesel engine fuel injection system researchgate. Acces pdf electronic fuel injection system diesel engine. Effects of fuel jet and charge motion on mixing controlled combustion 4. In addition to this manual all special tools and test equipment as outlined herein are needed plus all service pertinent literature, the individual pump. Main functions of diesel fuel injection system definition of terms.
The distributor type injection pump with electronic diesel. Pdf highpressure commonrail fuel injection system with. Solenoidvalvecontrolled as in an electronically controlled diesel fuel injection system figure 5 32. So gasoline electronic direct injection system is classified as. This requires the development of an electronically controlled direct fuel injection system fitted with suitable modification to the engine. During the history of diesel fuel injection, the capabilities and the number of degrees of freedom to optimize diesel combustion have continually improved. The current development trends of automotive diesel engines are governed primarily by requirements for clean exhaust, improved fuel economy, and drivability. Research on electronically controlled fuel injection system abstract. The new method of forcing fuel injection for small diesel engines is considered by scientists salykin, lipilin, and skorobogatov 2017. The historical preeminence given to pure powertorque generation has hence taken a backseat though power still is a very positive motivator for the customer. Electronic diesel control edc 16 design and function selfstudy programme 304. Often limits of knowledge, technology or manufacturing capability governed the chain of improvements.
Hence, no fuel oil will enter the precision fastacting control valves in the hydraulic oil control loop. The high pressure pump plunger is actuated by a cam, and produces the fuel pressure necessary to open the injector valve at the correct time. The purpose of the fuel injection system is to deliver fuel into the engine cylinders, while precisely controlling the injection timing, fuel atomization, and other parameters. It gives the clear idea about how to work a fuel injection system. A fuel injection system, comprising a low pressure fuel delivery pump with constant output in fluid communication with a low pressure. The software contained in the ecm determines how the electronic diesel engine control system operates.
Distributor type injection pump, electronic diesel control. A basic efi system will consist of an electronic control unit ecu a fuel pump to deliver the required fuel pressure, fuel injectors and. Actuator is a device that performs work in response to an electronic signal. Electronic control system the electronic control system consist of various sensors which detect the state of engine and driving conditions, ecm is a device which controls various devices according to the signals from the sensors and various controlled devices. Effects of electronically controlled fuel injection system efi for marine diesel engines from journal of the jime vol. Keep in mind that dirt, dust and foreign matter are the greatest en emies of precision diesel fuel injection equip ment. The primary purposes of the diesel fuel injection system are graphically represented in figure 1. This manual covers the electronic control models ecdv3, ecdv3 rom, ecdv4, and ecdv5 of the electronically controlled, distributor type fuel injection system, including actual examples.
Electronic fuel injection systems for heavyduty engines. This paper describes advanced electronic fuel injection system for small 4stroke vehicles. Fuel system diagrams and schematics fuel system block diagrams 1 connection lines direction of information flow control system and subsystem blocks each block represents a system. With edc 16 electronic diesel control, an engine management system has been made available that meets these demands.
In the event of any discrepancy in the process of implementation, the chinese version gbt 25365. The actuator controls are shown as just one block in this. The ecm receives power from the battery and ignition switch and provides a reference voltage for some sensors. Electronic unit fuel injection eui systemsrelying on data the oem loaded into the ecm, throttle position, engine and outdoor temperature, and even altitude, the computer system energizes and deenergizes the sole noids that control the injector s spill and needlecontrol valves. All fuel systems for diesel engines use a plunger and barrel in order to pump fuel under high pressure into the combustion chamber. Bosch distributor type injection pump with electronic diesel control veedc provide stringent emission norms and customer requirements on driving comfort and performance.
Fuel injection system presented by raghvendra kumar pandey 10me123 national institute od technology, durgapur 10nov 1 2. Basic diesel engine operation diesel engine force air by the intake valve into the cylinder high compression ratio heats the air enough to ignite the fuel fuel is injected into the cylinder at high pressure the amount of fuel injected suits to the load and controls engine speed. Highpressure commonrail fuel injection system refers to a new method of fuel supply which can entirely separate the. Pdf ci diesel engine fuel injection system, combustion process in direct injection, stages of the overall. These demands are now primarily fulfilled by the electronic control, the system which provides.
The fuel pump provides pressurized fuel to the engine and is electronically controlled by the fuel pump pcm relay. Effects of fuel jet and charge motion on mixingcontrolled combustion 4. The amount of fuel and the amount of air delivered can be regulated independently. Bosch electronic fuel injection systems shop manual.
Electronically controlled distributor type fuel injection. To meet the pressing needs for the diesel engine to deliver cleaner exhaust gas emissions, lower fuel consumption, and reduced noise, advances are being made in adopting electronic control in its fuel injection system. Highpressure commonrail fuel injection system with electronic control system in diesel engine. Types of diesel fuel injection systems it still runs. Us4763611a electronically controlled fuel injection pump. The main types of injection systems include pumplinenozzle, unit injector, and common rail. Highpressure commonrail fuel injection system is the most common technique of fuel injection used in diesel engine of automobiles. Electronically controlled diesel injection systems for cars techtips. Fuel injection systems diesel ruimanuelvieirapinto 1090039 sistemas automoveis anolectivo20092010 fuel injectionsystems diesel sistemas automoveis anolectivo20092010 1 basic diesel fuel systems 2 injection pumps 3 injectors 4 inline injection pump 5 radial rotary injection pump 6 electronic injection systems 7 bibliography. Electronic controlled diesel fuel injection system.
Electronic fuel injection seminar report, ppt, pdf for. Highpressure commonrail fuel injection system with. Pdf electronic fuel injection system electronic fuel. Injection pressure is more than double the current pressure, which makes it possible to greatly reduce particulate matter. Two main types of injector can be fitted, depending on whether the injection system is mechanically or electronically controlled. Many specialized concepts and terms are used to describe the components and the operation of diesel fuel injection systems.
Designing new fuel systems with an electronically controlled battery capable of creating pressures up to 200 mpa is presented in papers by grekhov 2011. Fuel is drawn from the fuel tank by a framemounted electric fuel pump. Jan 19, 2018 in many modern instances, this process is controlled in a similar fashion to that of a petrol engines electronic fuel injection system. Introduction this paper introduces an electronically controlled fuel injection system for new diesel engines, and describes the new technologies applied in the system. Injection systems in diesel engines distributor systems axial piston distributor pump radial piston pump unit pump systems pump units assembled in one unit. Electronic fuel injection diagnosis and repair active codes are codes describing a condition that is currently present to alert the driver or service technician of abnormal parameters.
Pilot injection control injects a small amount of fuel before the main injection. Cpfi used from 1992 to 1995 is a batchfire system, while csfi from 1996 is a sequential system. A modern gasoline injection system uses pressure from an electric fuel pump to spray fuel into the engine intake manifold. An electronically controlled fuel injection system for new. Research on electronically controlled fuel injection system. Challenges for diesel combustion diesel fuel injection the fuel spray serves multiple purposes. Challenges for diesel combustion diesel fuel injection. Complex theories or special functions are omitted in this manual in order to focus on the descrip. Electronic control fuel injection system based on gtpower and mototron article pdf available in procedia engineering 174. In a mechanical system, the injector is springloaded into the closed position and is opened by fuel pressure. Fuel injection system zthe fuel speed at the point of delivery is greater than the air speed to atomize the fuel. This program has investigated advanced diesel air charging and fuel injection to improve specific power, fuel economy, exhaust emissions, and cold startability.
In this system, the energy required for obtaining steam was. Machinery for diesel engines specifications part 1. The former system is called multiport fuel injection and the latter is direct injection. Modern injection systems reach very high injection pressures, and utilize sophisticated electronic control methods. These tolerances make it necessary for the diesel fuel to have sufficient lubrication qualities to prevent rapid wear or damage. The digital rate shaping strategy drs contributes to a very small delay between preinjection and main injection. Us4541272a electronically controlled fuel injection system.