![]() Modern EGR valves feature a continuously variable valve, controlled and monitored via the engine managenent software. ![]() Early EGR valves were typically vacuum controlled, nowadays however, electonics plays a big part. The EGR valve mus therefore have a control system that dictates when it should be open, closed or indeed, somewhere inbetween.ĮGR systems have evolved over the years however, the system essantially consits of pipework linking the esxhaust and the inlet manifolds, the EGR valve itself and a control method. An oxygen-depleted charge will not produce any power. Thinking about what EGR valve does, it then follows that the introduction of exhaust gasses into the engine must not occur when the driver demands power from the engine. To think of things in a simpler way: how do you encourage a fire to burn more intensly? You pump the bellows and introduce oxygen. By introducting exhaust gases (devoid of oxygen) into the air intake, the combustion temperature will be lower, resulting in the production of NOx being reduced. ![]() These are harmful to the environment and it is therefore it is desirable to control and limit them. ![]() As a byproduct of compbusiont, particualry in a diesel engine, oxides of nitrogen are formed (often refered to as NOx). It should therefore be no surprize that the primary function of the EGR valve is to serve the increasingly stringent emissions standards and limits placed upon vehicle manufacturers. As mentioned, EGR is an emissions-realted system. ![]()
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