Depending on whether the exhaust gas enters the cylinder through the engine's intake system, the EGR system can be divided into:
Internal system features: By changing the valve phase, the structure is simple and the application is convenient, but it is difficult to accurately control the EGR rate. The effect is not significant Internal EGR
External system features: It needs special pipe, and the EGR rate can be precisely controlled through the electronic control system. The effect is significant. At present, external EGR is more commonly used.
Turbocharged and intercooled diesel engines generally achieve exhaust gas recirculation in two ways: One is the introduction of exhaust gas in front of the turbine into the intercooler, which is called high pressure exhaust gas reversal. The use of variable area turbochargers can increase the effective working range of exhaust gas recirculation, reduce nitrogen oxides (NOX) and particulates (PT), and increase fuel consumption. This may be due to the use of high pressure exhaust gas recirculation systems for increasing The best way to press a cooled diesel engine. The other is that before the exhaust gas after the turbine is introduced into the compressor, it is called a low-pressure exhaust gas recirculation system, which can effectively reduce nitrogen oxides, and the exhaust gas circulation has a larger working range, and matching with the diesel engine can effectively perform its function.
Now we use the most low pressure exhaust gas recirculation system, the main component of which is a digitally-controlled EGR valve. The digitally-controlled EGR valve is mounted on the right exhaust manifold. The role is to independently control the amount of exhaust gas recirculated to the engine, regardless of the degree of manifold vacuum. The EGR valve controls the amount of exhaust gas flowing from the exhaust manifold back to the intake manifold through three incrementally-diametered metering orifices to create a combination of seven different flow rates. Each metering hole consists of a solenoid valve and a needle valve. When the solenoid valve is energized, the armature is attracted to the top by the magnet to open the metering hole. The rotary needle valve feature ensures good sealing when the EGR valve is closed.
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