FIELD: engine devices and pumps.
SUBSTANCE: control unit is designed for the internal combustion engine (2). Engine (2) includes a throttle valve (24) located in the intake duct (10), an EGR channel (30) for recirculating exhaust gas to the side behind the throttle valve (24) in the intake duct (10), and a valve (32) EGR located in the EGR channel (30). Control unit (50) controls fresh air volume by means of throttle valve (24) and by means of EGR valve (32) to determine the closing degree of throttle valve (24) and the opening degree of EGR valve (32), respectively, so that cause the approximation of fresh air volume or the quantitative parameter of the state, correlated with fresh air volume, to the target value. Control device (50) comprises a differential pressure control means and a switching control means. Differential pressure control means is designed to control the differential pressure of throttle valve (24) and the differential pressure control of EGR valve (32). Differential pressure control of throttle valve (24) is a control for adjusting the first differential pressure, which is the difference between gas pressure on the inlet side of throttle valve (24) and gas pressure on the exhaust side of throttle valve (24) in intake duct (10), target differential pressure of throttle valve (24) during fresh air volume control with EGR valve (32). Differential pressure control (32) of EGR valve is a control for adjusting the second differential pressure, which is the difference between gas pressure on the inlet side of EGR valve (32) and gas pressure on the exhaust side of EGR valve (32) in EGR channel (10), target differential pressure of EGR valve (32) during fresh air volume control with throttle valve (24). Switching control device is intended to switch over to controlling the fresh air volume by EGR valve (32) in case if the first differential pressure falls below the target differential pressure of throttle valve (24) during fresh air volume control by throttle valve (24). Switching control device is also intended to switch over to controlling fresh air through throttle valve (24) in case if the second differential pressure falls below the target differential pressure of EGR valve (32) during fresh air volume control with EGR valve (32).
EFFECT: increasing the response rate during control before and after switching the control.
12 cl, 16 dwg
