System Development for the Design of Gasoline Engine ECU

To reduce air pollution by the exhaust gases from automotives, it is necessary to control air/fuel ratio appropriate to engine operating condition, which can be achieved by adopting an electronic control system.

In this study we designed and fabracated PC-ECU (Personal Computer interfaced - Electronic Control Unit) to develop the automotive engine control system. PC-ECU is made to perform engine control with the application of various control logics instead of the C-ECU. As a first step to develop control logics we applied jump-ramp control to the real engine using a simple on/off O₂ sensor and performed engine control by the use of PC-ECU. Also, we introduced a wide band O₂ sensor instead of the simple on/off O₂ sensor and adopted the PI control.

The results show that the control performance in case of using a wide band O₂ sensor is much better than in case of using a simple on/off O₂ sensor.