Diesel Engine Efficiency Analysis
The analysis of the efficiency of diesel requires an elaborate understanding of how fuel is consumed in the engine. From the tank, diesel flows via a pipe into injector pump. The injector pumps diesel to the combustion chamber via a nozzle. From the rotating crank shaft, the pistons connected to the camshaft via a gudgeon pin are moved upwards and downwards. The compression of highly volatile vapor of fuel is maintained by the piston rings before the gases are ignited by a spark flashing plug. At the point, of ignition a greater pressure is created on the piston head that forces it downwards and, the whole process repeats itself. The analysis of the diesel fuel includes the description of its various properties that define its consumption in an engine system and the energy produced in the system. There are differences and similarities between the 36k American Petroleum Institute (API) attributed to by their production.
Distillation- is the feature in the fuel that outlines the range at which a fuel volatilizes and forms vapor. The end point of a fuel refers to the greatest temperature experienced when the distillation of the fuel takes place. The end point is not easy to realize and therefore, an EMA which is about ninety five percent is used. Lower capacity engines have lower EMR and hence D975 is recommended.
Kinematic Viscosity- the viscosity influences the degree of injector lubrication. The fuels with higher viscosity provide inadequate lubrication in the system while the fuel with lower viscosity provides adequate lubrication but this can lead to the wearing out of the pistons and the piston rings. This may result into leakage and insufficient compression hence low efficiency.
Ash Content- this refers to the amount of metal substances present in the fuel and which can cause faster wear out of the injector.
API Gravity- refers to the amount of the fuels specific gravity or mass per volume. It is temperature dependent and thus known to be vital for the engine performance. Increase in the API gravity results into a decrease in the engine power of about three to five percent. The API also leads to an increase in the fuel consumption in the engine.
Lubricity- is the ability of the fuel to lower friction between points in contact during the motion and, the vessel is exposed to a great load.
Accelerated Stability- the diesel has to be nonvolatile under moderate conditions to prevent the darkening of the combustion systems that reduce efficiency due to the suit that clogs the aeration systems.
Detergency- is a property added to the fuel to assist in its efficiency. The detergent prevents the fuel from forming the solid suit in the chambers and the exhaust system. The suit may restrict the nozzle averting the sprinkling system of the fuel.
Comparison of Fuel Ratings
Diesel #2 Fuel API
Low Temperature Flow, °C 4 4
Distillation % Vol. Recovery, °C – –
Flash Point, °C min 52 56
Water, ppm max 200 180
Sediment, ppm max 10 10
90%, max 332 298
95%, max. 355 326
Kinematic Viscosity, 40 °C 1.9-4.2 1.5-3.6
Ash, % max 0.01 0.02
API Gravity, max. 43 39
Lubricity, g. min. 3100 3100
Accelerated Stability, mg/L max. 15 15
Detergency – L10 Injector <6 <6
Microbial Growth 3 3
The Effects of Boost Pressure Sensor or Boost Pressure Failure on Power Output
The boosts sensors utilize the pressure alterations mechanism into regulate the power. In the boost pressure sensor5s, there is a silicon foil that is located relative top the chamber. The determinant pressure is controlled to either be a absolute vacuum pressure or a calibrated pressure. The pressure to be measured is on the opposite side. The chip regulates the electrical resistance in the engine by flexing with respect to the pressure. The variation in the resistance alters the electrical signals relayed to the engine. The ECM in the engine is responsible for the alterations in the electrical signals as being created due to temperature changes. The consume3d manifold pressure absolutely relates to the engine load. The ECM therefore has to establish the quantity of the load to remit the signals to the pump on the amount of fuel to release, for the cylinder lighting sequence to execute the effective engine operations.
When a high voltage is discharged in relation to the pressure, the injector is commanded to release more fuel to the combustion chamber. The fuel is ignited frequently to increase the energy produced. Higher energy output by the engine prompts faster movement as the engine power is improved. The engine can this executes higher tasks including higher load capacity tolerance. However lower pressures detected by the sensor is perceived to be accompanied by lighter weights. Extremely lower pressures are boosted to normal levels to necessitate normal injection of the fuel to the chamber for combustion to yield energy for the engine motion. Failure of the pressure sensors would mean no alterations in pressure and the engine voltage signals. The engine can therefore not perform above or below the state of malfunction. When the engine is subjected to heavier loads, it goes off because the injector cannot avail the fuel promptly. The surging of the fuel in the chamber leaves no fuel in the system thus no combustion and hence the engine goes off.
Torque
Torque refers to the work done by an engine through a given distance. Toque is involved in centripetal and the centrifugal movements in the engine. The toque rotates through the shafts and the pins in the engine to form moments. The toque is determined by checking on the amount of force exerted on the wheel rollers.
Horsepower
Horsepower refers to the task executed by the engine on linear direction. The linear movement of the engine is determined by the circular movement of the engine components. This shows that for a horsepower to exist there has to be a torque. Thus the following principle equation can be used to facilitate better understanding. The horsepower can be determining the acceleration of a loaded roller. Horsepower = (Torque x Revolutions per Minute) / 5252.
Fuel rate
This is the amount of fuel that can compensate the engine shaft at a given time of operation. The amount of load that the engine withstands determines the consumption of the fuel by the engine to ensure that the shaft is kept lubricated.
Boost pressure
Boost pressure refers to the additional pressure exerted to the engine system to compensate for the pressure deficiency for the normal functioning of the engine.
Troubleshooting
The toque, horsepower, boosts pressure and fuel rate can be used in a nondestructive way to identify problems in an engine. To identify the problems caused by the toque, a little weight can be exerted on the engine roller to determine whether its efficiency can be one hundred or closer. Failure in the efficiency can show that the problem originates from the circular motion. Horsepower complications can be noted by setting the engine to run in a smoother way without exertion of much circular problem. Fuel rate complication can be realized by ensuring an effective boost pressure to maintain optimal pressures, thus an abnormality in the fuel consumption can denote irregularity in fuel rate.
