Exhaust gas recirculation system for an internal combustion engine

摘要

An exhaust gas recirculation device for an internal combustion engine having a supercharger has an intake air passage that intakes intake air for the internal combustion engine, an exhaust passage that carries away exhaust air from the internal combustion engine, an exhaust gas recirculation passage connected to the intake air passage, and an exhaust gas recirculation valve interposed within the exhaust gas recirculation passage. The exhaust gas recirculation passage recirculates a part of the exhaust gas based on an openness of the exhaust gas recirculation valve to control an amount of exhaust recirculation introduced into the intake air passage. A first end of the exhaust gas recirculation passage is connected to the intake air passage upstream of a compressor of the supercharger. A second end of the exhaust gas recirculation passage is connected to the exhaust passage downstream of a turbine of the supercharger.

主权项

1. An internal combustion engine having a supercharger, comprising:
an intake air passage delivering intake air into the internal combustion engine; an exhaust passage discharging exhaust gas from the internal combustion engine; an exhaust gas recirculation passage connected to the exhaust passage and the intake air passage; and an exhaust gas recirculation valve interposed within the exhaust gas recirculation passage to control an amount of exhaust recirculation introduced into the intake air passage, wherein a first end of the exhaust gas recirculation passage is connected to the intake air passage upstream of a compressor of the supercharger, wherein a second end of the exhaust gas recirculation passage is connected to the exhaust passage downstream of a turbine of the supercharger, and an exhaust gas recirculation control device, wherein the exhaust gas control device further comprises:
an intake air sensor detecting an amount of the intake air upstream of the compressor;an intake air pressure estimate unit estimating an intake air pressure at the first end of the exhaust recirculation passage with respect of the amount of the intake air upstream of the compressor being detected;a first exhaust gas pressure estimating unit estimating a first estimate of exhaust gas pressure at the second end of exhaust gas recirculation passage with respect to the amount of the intake air upstream of the compressor being detected; anda second exhaust gas pressure estimating unit estimating a second estimate of exhaust gas pressure in combination with a predetermined response-delay processing on the first estimate of exhaust gas pressure, and wherein the opening of the exhaust gas recirculation valve is adjusted based on a pressure difference between the intake air pressure estimated by the intake air pressure estimate unit and the second estimate of the exhaust gas pressure.