Engine Management System ( Ems )

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With a tougher legislation and the need for cleaner and more economical engine operation, it has become increasingly more difficult to design an engine which can be compatible with the new requirements. Engine Management System (EMS) is an integrated electrical system which can achieve this by closely monitoring the operation of an engine. It monitors and controls all the key functions of the engine and the exhaust aftertreatment system for a cleaner, more efficient and high power output operation. EMS controls key systems such as fuel injection, turbocharging and exhaust gas recirculation. 1 Air subsystem Air subsystem is a key factor in determining torque output and, engine performance. More the cylinder charged with clean air, the higher the maximum possible engine power output. Figure 1 shows the main components of an air subsystem: The air filter prevents particles and dust from entering the engine in order to reduce wear in the bearings, piston rings, cylinder walls. It also prevents higher fuel consumption and pollutant emissions which result from particles in the engine. Then supercharging/turbocharging is utilised to increase the power output from the engine by drawing pressurised air under force into the cylinders thus higher air mass. This has a great effect in reducing the fuel consumption and exhaust-gas emission rates. Compressing the air by the turbocharger, leads to excess heat which has a negative effect on cylinder charge. Downstream of the
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