Low-pressure waste gas recirculating system based on supercharged engine

Abstract

The invention provides a low-pressure waste gas recirculating system based on a supercharged engine. The supercharged engine comprises a gas inlet side and a gas compressor arranged on the gas inlet side. The low-pressure waste gas recirculating system comprises a waste gas recirculating loop, an auxiliary waste gas recirculating loop and a controller; the waste gas recirculating loop is used for introducing part of waste gas exhausted out of a Miller and / or Atkinson circulating engine into the gas inlet side through the gas compressor for reburning; the auxiliary waste gas recirculating loop is used for introducing part of the waste gas exhausted out of the Miller and / or Atkinson circulating engine into the gas inlet side for reburning on the condition that the gas compressor is not used; the controller is used for controlling the waste gas to selectively flow through the waste gas recirculating loop and the auxiliary waste gas recirculating loop according to the vehicle driving speed. According to the low-pressure waste gas recirculating system based on the supercharged engine, part of the waste gas exhausted out of the engine can enter an air cylinder for reburning through the gas compressor or not through the gas compressor under the different conditions, therefore, the gas temperature in the air cylinder before stroke compressing and the gas temperature at the beginning of burning can be increased, then the engine efficiency is improved, and the waste gas recirculating rate is increased.

Description

technical field [0001] The invention relates to the field of automobile engines, in particular to a low-pressure exhaust gas recirculation system based on a supercharged engine. Background technique [0002] A supercharged engine is an engine equipped with a turbocharger. The first is that the intake port of the turbine is connected to the engine exhaust manifold, and the exhaust port of the turbine is connected to the exhaust pipe. Then the air inlet of the compressor is connected with the air filter pipe, the exhaust port of the air compressor is connected with the intake manifold, and finally the turbine and the impeller are installed in the turbine and the compressor respectively, and the two are coaxially rigidly connected. It uses the inertial momentum of the exhaust gas discharged from the engine to drive the turbine in the turbine chamber, and the turbine drives the coaxial impeller, which presses and sends fresh air into the cylinder. The main function of turbocha...

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Problems solved by technology

[0003] However, during the operation of the above-mentioned Miller and / or Atkinson cycle engine, this cycle method reduces the temperature of the gas in the cylinder before the engine compression stroke and the temperature of the gas at the beginning of combustion, resulting in a slow combustion rate and is not conducive to improving engine thermal efficiency

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