spark advance modeling and control
- 1. Guide: G. A. Matre
- 2. Introduction • the fuel saving technologies range from variable compression ratio, to downsizing and turbo charging • fuel saving technologies range from variable compression ratio • one of the most important parameter affecting engine performances is spark advance • fundamental parameter is controlled in open loop
- 3. Abbreviations and symbols • BDC bottom dead centre • SA spark advance • BTDC before top dead center • RMS root mean square • CA crank angle • SNR signal to noise ratio • DAQ data acquisition • QP pilot quantity • ECU electronic control unit • TDC top dead centre • IGBT insulated gate bipolar transistor • TTL transistor to transistor logic • IR infra-red • WOT wide open throttle • P-P peak to peak
- 4. CONSTRUCTION
- 6. Knock control • detect the knocking signal and to control the ignition timing to prevent the knocking • detect a stable knocking signal avoiding the affect of the various environmental changes and variations of the circuit
- 8. Realization of the spark timing control system • feedback control of spark advance on a four cylinder series production engine • set up and test a system capable to take the spark timing control of a modern engine • the ignition principle and process and of the hardware requirements and troubles • heat up a local portion of mixture to make it reach the auto- ignition temperature • the ignition must be properly timed with respect to the piston movement
- 9. Causes of incorrect spark timing •On systems that use the ECM to compute ignition spark advance •Emissions and drivability concerns quick check of initial ignition timing •Engine load miscalculated so incorrect input signals
- 10. Purpose of spark advance control system • spark advance increases with higher engine speeds for performance and fuel economy • spark advance needs to decrease under heavy load conditions to avoid detonation
- 11. Effects of spark advance on emissivity and drivability • Too much spark advance – during high engine load • Too little spark advance – causes only partial combustion of the air
- 12. Advantages • Increases combustion temperature and pressure • useful to check the working efficiency of the ignition systems
- 13. CONCLUSION • composed of two bipolar transistors designed for automotive ignition • tested on a test bench equipped with an eddy current dynamometer • Increases engine efficiency
- 14. REFERENCE • Gregg W. Pestana, 1989, “Engine Control Methods Using Combustion Pressure Feedback”, Sae Paper 890758 • Bosch, 2000, “Automotive Handbook”, Sae Claus Preuschoff, 2001, “Smart Igbt For Advanced Ignition Systems”, Sae Paper 2001-01- 1220 • Kaneyasu M., Kurihara N., Katogi K., Tabuchi K.., 1995, “An Advanced Engine Knock Detection Module Performs Higher Accurate Mbt Control And Fuel Consumption Improvement”, 8th International Conference On • Solid-State Sensors And Actuators. Volume 1 Dale J.D., Checkel M. D., Smy P. R., 1997, “Application Of High Energy Ignition Systems To Engines”, Progress In Energy And Combustion Science, Vol.23, Pp 379-398