8.1.2014. 4 STROKE ENGINE OPERATION Intake Stroke Compression Stroke Combustion Exhaust Stroke Different Engine states require different air/fuel concentration,

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Presentation transcript:

4 STROKE ENGINE OPERATION Intake Stroke Compression Stroke Combustion Exhaust Stroke Different Engine states require different air/fuel concentration, different ignition advance

MOTIVATION Most modern car engines are 4 stroke engines. To achieve maximum efficiency. the engine must be supplied with precise fuel amounts (Air-Fuel Ratio). fuel must be burn at the ideal time when the pistons move up and down (Ignition Advance). SoC are very cheap For these – we need fast input and output access, in the ~10us range.

PROJECT GOALS Design a real time system that reads engine sensors and : Determine the ideal spark time Determine the ideal air-fuel mixture enable easy updating of the ECU via the built in SD-CARD Affordable Designed for a 4cylinder engine

NAÏVE ARCHITECTURE ECU Sampling rate of 233hz !

SOLUTION : FINAL ARCHITECTURE 2 nd Arduino UART DigitalAnaloginputs

SOLUTION : FINAL ARCHITECTURE ECU Outputs :Fuel, Ignition pulses Inputs :Engine sensors (MAP,CLT,IAT,CRANK,TPS,O2)

BLOCK DIAGRAM Load Tables from SD-card StreamSend RX Calc Ign Adv, Inj PW StreamSend TX Read Sensors StreamSend TX StreamSend RX Calc Inj, Ign times Crank Sensor Drive Outputs Arduino Galileo

Calc desired angle for event REAL TIME PROGRAMMING Calc time untill event Schedule event : time to start, duration Wait untill : current_time=interrupt_time End funcStart func interrupt time=current_time+ duration interrupt time=current_time+ time_to_start

TESTING ENVIRONMENT ECU Galileo+Arduino Nano D2: Crank (timerInterrupt driven) LPF PWM: MAP TPS COOLANT IAT Analog voltages Each engine scenario is a different test bench code Engine simulator

TEST SCENARIOS Accelerate – Increasing RPM. more sparks and increased fuel amount Decelerate – Decreasing RPM. less sparks and decreasing fuel amount Warming Engine – Increasing COOLANT. decreasing fuel amount. Slope – Increasing TPS. increasing fuel amount High Load – Increasing MAP. Increasing fuel amount

ACCELERATION SIMULATION RESULTS

WARMING ENGINE SIMULATION RESULTS

STEEP SLOPE SIMULATION RESULTS

DECELERATE SIMULATION RESULTS

HIGH LOAD SIMULATION RESULTS

NEXT STEPS? engine1engine2 serial0 serial1

NEXT STEPS? engine1engineN I2c BUS engine2 …

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