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1 Journal of Polish CIMAC

1 2010

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Analysys and symulation of internal combustion engine performance characteristics using electronic interface with "EEC IV" car computer

Kaźmierczak A., Krakowian K., Górniak A., Kawaliło P.

Journal of Polish CIMAC

2010

Vol. 5, no 1

69-76

Currently all modern car combustion engines are equipped with an electronic control device, sometimes called on-board computer. It is responsible for driving the engine depending on driver behavior, engine working conditions and engine load. Main loads an Electronic Engine Control (EEC) unit is empowered to control are injectors (to doze certain amount of fuel) and ignition system (to ensure ignition timing). The control decision is estimated on the basis of readings from various sensors like MAP (Manifold Air Pressure) Sensor, CKP (Crankshaft Position) Sensor, air temperature sensor, throttle position and many others. Treating the EEC unit as a black box with specific inputs and outputs, an engine simulator was be constructed. Its principle is to substitute real sensors with compatible artificial electrical signals, arrange them in patterns similar to typical engine working conditions, expose EEC to them and eventually measure how EEC changes output signals values in real-time. The purpose behind was to create a fixture for educational purposes. Its operator can easily manipulate with virtual throttle pedal, set temperatures, load, even simulate sensor disconnection, having the ability of monitoring and registering the resulting EEC control decision. Those activities are realized by an electronic circuit involving 8-bit microcontroller and signals level match elements usage. Currently chosen target to interface with is Ford EEC IV unit, originally designed for Ford Sierra 2.0DOHC EFI engine. A series of successful measurements of ignition angle and cylinder filling characteristics have been done. Achieved results were verified with empirical data collected from a real engine.