| 摘要 |
PURPOSE:To have precision control of th amount of exhaust feedback in response to the actual operating condition of an internal combustion engine, by setting the amount of exhaust feedback in accordance with the load of engine and the pressure difference between suction and exhaust gases. CONSTITUTION:Signals from a pressure difference sensor 52, throttle sensor 48, lift position sensor 36 and coolant temp. sensor 50 are fed in an electronic control device 46 through an A-D converter circuit 68. In the ROM 62 of this electronic control device 46, the converted EGR ratio as the lift amount of an EGR control valve is stored upon preparing in the form of two-dimensional map of the load of engine and the pressure difference between suction and exhaust gases. That is, the EGR ratio is set with the suction/exhaust pressure difference as parameter, in stead of the number of engine revolutions as conventional. This enables precision control of the amount of exhaust feedback in response to the actual operating conditions of internal combustion engine. |
