Engine system with exhaust gas recirculation

Abstract

The present invention relates to an engine system having an exhaust gas recirculation (EGR) device, comprising: an engine including a plurality of combustion chambers; an intake line through which intake air supplied to the plurality of combustion chambers flows; an exhaust line from Exhaust gas from the plurality of combustion chambers flows through the exhaust line; and a turbocharger including: a turbine disposed on the exhaust line and rotated by the exhaust gas; and a compressor disposed on the intake line and rotated And compress the outside air. The EGR device includes: a recirculation pipeline, branched from the exhaust pipeline; an EGR valve, arranged in the recirculation pipeline, and adjusting the amount of recirculation gas; a pressure sensor, arranged in the front end of the EGR valve of the recirculation pipeline, to Measuring the pressure of the recirculation gas; and a flow regulating device, which is arranged at the rear end of the EGR valve of the recirculation pipeline, and regulates the amount of the recirculation gas.

Description

technical field [0001] The present disclosure relates to engine systems having exhaust gas recirculation (EGR) devices. More particularly, the present disclosure relates to engine systems having an EGR device capable of accurately measuring and controlling the flow of recirculated air. Background technique [0002] The vehicle engine generates power by mixing and burning air flowing in from the outside with fuel at an appropriate ratio. [0003] In generating power by driving the engine, for combustion, desired output and combustion efficiency can be obtained only when external air is sufficiently supplied. For this reason, in order to improve the fuel efficiency of the engine, as a device that pressurizes and supplies air for combustion, a turbocharger is used. [0004] In general, a turbocharger is a device that rotates a turbine using the pressure of exhaust gas discharged from the engine and increases the output of the engine by supplying high-force air to a combustion...

AI Technical Summary

Problems solved by technology

However, when such a differential pressure generating valve is installed, there arises a problem that the production cost of the vehicle increases

[0011] In addition, a differential pressure sensor that detects the pressure difference between the front end and rear end of the EGR valve that adjusts the amount of recirculation gas is provided, and since the pressure difference between the front end and rear end of the EGR valve is small in the low speed / low load region , the accuracy of EGR control decreases

[0012] Therefore, since the accurate recirculated exhaust gas amount cannot be adjusted, the combustion stability cannot be ensured, and thus the ignition timing cannot be advanced, and there arises a problem that it is difficult to improve the fuel efficiency of the vehicle

Images