Secondary air injection on gasoline engines

The secondary air injection system of gasoline engines ensures a reduced emission of pollutants in the warm-up phase when starting the engine. During this time, the engine requires a mixture with fuel surplus until reaching the operating temperature, with the result that some of the fuel leaves the combustion chamber unburned. Since the lambda control […]

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Turbo-compound engine: The “cooler” turbocharger

A turbo-compound engine uses the exhaust gases through a downstream turbine. This can be installed in addition to a turbocharger. While the first exhaust gas turbocharger provides more boost pressure in the combustion chamber due to the exhaust gas energy and thus higher engine power, the second turbocharger converts the remaining energy into movement power. […]

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The Exhaust System

The exhaust system receives the exhaust gases escaping from the exhaust valves of the cylinders through the exhaust manifold. These are attenuated in their noise generation after they have been cleaned in the catalyst, and discharged into the environment at a suitable part of the vehicle. The entire system is connected to the underside of […]

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Direct Fuel Injection

In a diesel or gasoline engine with direct fuel injection, the fuel is injected through a nozzle with up to 200 bar directly into the combustion chamber. This mixes with the air that was introduced through the inlet valve. In gasoline engines with direct injection gasoline is supplied mainly in the compression stroke. In diesel […]

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Turbocharger: How Exhaust Gases Increase Engine Power

A turbocharger (also exhaust gas turbocharger) uses the energy that is lost by the exhaust gas of a reciprocating engine, profitable for driving the cylinder. It compresses the combustion air supplied to the engine, providing more torque and an increase in engine power. In a normal reciprocating engine, the amount of air needed for combustion […]

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