Patent ID: 7131271

Claim:
A method for low-pressure EGR control in a motor vehicle internal combustion engine having a turbocharger and a device assembled as a unit into an exhaust system, that embodies a throttle valve and an EGR valve, the method comprising: a) controlling engine back-pressure by selectively restricting the throttle valve disposed in the exhaust system of the engine downstream of both one or more exhaust gas treatment devices in the exhaust system and a turbine of the turbocharger in the exhaust system; b) controlling, in conjunction with control of engine back-pressure, EGR flow to an intake system of the engine through an EGR flow path having a pierce point to the exhaust system upstream of the throttle valve and downstream of both the one or more exhaust gas treatment devices and the turbine and a pierce point to the intake system upstream of a compressor of the turbocharger in the intake system by selectively restricting the EGR valve in the EGR flow path to achieve desired EGR flow.