Original network of armour engineering machinery
The engine, which is one of the most important components on the excavator, is often referred to as the “heart of the excavator”, and transforms the thermal energy of the fuel into a mechanical energy source for the excavator. Most of the engines currently used on the excavators are diesel engines, which have the advantage of being more heat-efficient and more dynamic than gasoline engines。
In recent years, as the engine manufacturing process has evolved, domestic and foreign engine manufacturers have introduced new high-tech products to meet the needs of the population. In the field of industrial engines, the more famous brands are 50 bells, commins, dowtz, etc. The industrial diesel engines produced by these manufacturers are widely used in power systems of engineering machinery such as excavators。
50 bell industrial diesel model
In general, the engine power system consists of two main agencies and five major systems: the warp pole, the gas distribution unit, the fuel supply system, the lubricants system, the cooling system, the start-up system and the engine control system。
The use of diesel engines in the product lines of the excavators is considered to have a significant market share of the 50-bell diesel engines. From another perspective, 50 bell diesel engines are typical products of many diesel engines. Currently, newer diesel engines use third-generation fuel supply systems - electro-controlled high-voltage co-orbit jet technology. For example, the fuel supply system for the 50-bell diesel engine is now available。
Fuel system maps
Composition and work processes of the fuel supply system
The fuel supply system for the 50-belled diesel engines consists mainly of engine control modules (ecm), high-pressure oil pumps, high-pressure co-orbit tubes, electric jets and various sensors。
Low-voltage electromagnetic pumps feed fuel into high-pressure oil pumps, transport high-pressure fuel to high-pressure co-orbit tubes after pressurization by high-pressure pumps, the engine control module (ecm) integrates information on various sensors, determines the appropriate oil injection period according to the machine's operational state, and controls the electronic jets spray fuel from high-pressure co-orbit tubes into the cylinder. Owing to very high pressure and small vents of fuel, the fuel has been mistified and burned sufficiently to produce large flying power。
Engine control module (ecm)
The engine control module (ecm), which is the control core of the diesel engine, monitors the information transmitted from various sensors, such as speed rotation, load, transmission slots, curved positions, cooling water temperature, lubricant temperature, etc., and makes judgement and instructions on the handling of the signal obtained and controls the engine system。
Engine control module (ecm)
The engine control module (ecm) also provides diagnostics of system functionality, detects malfunctions in the operation of the system and sends a fail warning signal to the operator, while recording the diagnostic failure code. This allows maintenance staff to determine the area of failure by identifying the failure code and to perform maintenance operations more effectively。
Various sensors
More than a dozen sensors spread over diesel engines, similar to the human nervous system, provide timely feedback in the form of telecommunications to the ecm of the various measurements of engines so that the ecm can give the corresponding control instructions according to the machine's operational condition. These sensors include: warp axis position sensors, cam axis position sensors, cooling fluid temperature sensors, fuel temperature sensors, atmospheric pressure sensors, co-orbit pressure sensors, pressure-inducing pressure sensors, oil pressure sensors, pressure-injection temperature sensors, gas intake temperature sensors, etc。
Placement of various sensors
Emp
Owing to remote control of fuel filters and prefilters, the distance of fuel from tanks to high-pressure pumps, which function as fuel, has become longer。
--empirenews. Page..
Thus, in order to extract fuel from fuel tanks and ease air discharges during refurbishment, electromagnetic pumps were installed to reduce the load of high pressure pumps。
Emp
High pressure pump
The high-pressure oil pump, which drives three cylinders using the engine's revolving power, is treated by the plume compression and then converted into a high-pressure fuel and is then sent to a co-orbit。
High pressure pump
High pressure co-orbiting
The co-orbit pipeline receives fuel supplied by pumps and maintains a co-orbit fuel pressure (accumulation of energy), which is then distributed to the various jets. Common orbit pressure sensors, flow regulators and pressure limiters are installed on co-orbits。
High pressure co-orbiting
Oil dispenser
The oil dispenser was installed on the cover of the tank and, on the basis of the ecm's instructions, it had a certain amount of fuel well mistified and entered the cylinder to promote fuel fire and combustion. The control of the timing and amount of the spray is achieved by controlling the oil dispenser。
Oil dispenser
Advantages and disadvantages of high-voltage co-orbit jet technology
As shown in the graph, the traditional non-jet state starts with the jet, while the co-orbit begins with the ignition. The traditional type begins to ejected (diesel is pressured), while the co-orbit has already been prejected and ignited, and the second type begins (primary). The co-orbit system has increased the area of fuel and air contact, improved the state of combustion and further increased the efficiency of combustion, while reducing the emissions of engines。
Traditional and co-orbit jets
It should be noted that fuel pumps and jets in high-pressure co-orbital engines are lubricated with their own fuel, and the use of fuel other than diesel fuel causes engine failure, and therefore the use of non-regulated fuel is strictly prohibited. In addition, the very high precision of the spare parts of the fuel supply system (in-house parts of the jets, etc.) and the pore of the fuel-traffic routes, which impose high requirements for the cleaning of diesel fuel, may be damaged if the alien is mixed or if the purity of diesel is not met。
There is a wide gap between the current phase of domestic oil extraction technology and foreign countries, where the purity of domestic diesel fuel is indistinguishable from foreign sources, and the high cost of repairing parts of the system, which has contributed to the widespread phenomenon of high-pressure co-orbit diesel engines in the country。
