8.1.2014. 4 stroke engine operation intake stroke compression stroke combustion exhaust stroke...
TRANSCRIPT
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Final Presentation
Engine Control Unit on SOC
By : Tamir Malka, Eliel PeretzSupervised : Mony OrbachSemester : Spring 14’
8.1.2014
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4 STROKE ENGINE OPERATION
Intake StrokeCompression StrokeCombustion Exhaust Stroke
Different Engine states require different air/fuel concentration, different ignition advance
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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.
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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
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NAÏVE ARCHITECTURE
ECUSampling rate of 233hz !
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SOLUTION : FINAL ARCHITECTURE
2nd Arduino
UARTDigitalAnaloginputs
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SOLUTION : FINAL ARCHITECTURE
ECUOutputs :Fuel, Ignition pulses
Inputs :Engine sensors (MAP,CLT,IAT,CRANK,TPS,O2)
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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
ArduinoGalileo
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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 funcinterrupt time=current_time+duration
interrupt time=current_time+time_to_start
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TESTING ENVIRONMENT
ECUGalileo+Arduino Nano
D2: Crank (timerInterrupt driven)
LPF
PWM:MAPTPSCOOLANTIAT
Analog voltages
Each engine scenario is a different test bench code
Engine simulator
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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
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ACCELERATION SIMULATION RESULTS
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WARMING ENGINE SIMULATION RESULTS
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STEEP SLOPE SIMULATION RESULTS
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DECELERATE SIMULATION RESULTS
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HIGH LOAD SIMULATION RESULTS
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NEXT STEPS?
engine1 engine2
serial0 serial1
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NEXT STEPS?
engine1 engineN
I2c BUS
engine2
…
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BACKUP
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