Emc 2 Lecture 6

8/8/2019 Emc 2 Lecture 6

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EMC2 2006 Lecture #6 Engine Sensors

Engineers (and Drivers) WantedEngineers (and Drivers) Wanted

Automotive Sensors and ElectronicsAutomotive Sensors and Electronics

Steve ReynoldsSteve Reynolds

As presented for the Formula SAE Team

E=MC 2 2006 May 8 to 12 and May 15 to 29

AutomotiveComputer Problems

Formula SAE and theTEC Engine Computer

How many microcontrollersin a 2005 midsize car ?

Our 4-Stroke Cycle

Fuel

Electricity

Spark

Air

Ignition TimingDone by TEC

Controlled by TEC

Controlled by you(the gas pedal)

Exhaust(Burnt fuel,unburned fuel,excess air)


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Making it goOverall Block Diagram

Gas-pedal positionsets desired

speed/acceleration(Driver Input)

TEC 3 EngineComputer

INPUT CONTROLLER ACTUATOR PROCESS

SENSOR

EngineCar &

Drive-train

DriversSeat of Pants

feeling

Car speed

Open Loop

A closed-loop system for car speed would be a cruise control

Formula SAE and the sensors

1) intake pressure

2) intake temperature

3) throttle position

4) coolant temperature5) exhaust oxygen

6) crank position

7) gear position

8) oil temperature

9)oil pressure

Intake ManifoldAir Pressure Sensor

Pressure tap

Crank Position Indicator

Fuel & Ignition ControlBlock Diagram Open Loop

Crank PositionSensor

MAP Sensor


INPUTCONTROLLER ACTUATOR PROCESS

InternalCombustion

EngineRPMFuel Injector

Spark

Engine RPM & Intake Manifold Pressure

Exhaust Gas Oxygen Sensor


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Exhaust Gas Oxygen Sensor Electrochemical cell thatproduces a voltage based

on the differing oxygencontent in the exhaust andthe outside air

For a stoichiometricmixture (Lambda = 1,14.7:1 air to fuel ratio) allthe oxygen in the reactionbetween air and fuelshould be consumed

Fuel & Ignition ControlBlock Diagram Closed Loop

Crank PositionSensor MAP Sensor


INPUTCONTROLLER ACTUATOR PROCESS

SENSOR

InternalCombustion


Ignition (Spark)

OxygenSensor

Throttle Position Sensor

Rotary Potentiometer

Air into Engine

Manifold & Coolant Temperature Sensors

Coolant sensor Intake Manifold Air Temperature Sensor

Fuel & Ignition ControlBlock Diagram Closed Loop

Crank PositionSensor MAP Sensor ThrottleSensor Coolant Temp.Sensor Intake Air Temp. Sensor

TEC 3 Engine

Computer

INPUT

CONTROLLER ACTUATOR PROCESS

SENSOR

Internal

Combustion


Ignition (Spark)

OxygenSensor

Gear Sensor

Ball makes contactwith this surfacewhen in 1 st gear

2

3


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2003 Wiring Diagram

TEC 3

CPSSensor

Gear Sensor

TempSensors

References & Acknowledgements

TEC 3 User Manual, Electromotive Inc. Engine Animation, http://www.keveney.com/otto.html Car Engine, www.howstuffworks.com Engine Basics,

http://homepage.mac.com/dgiessel/engine/basics.html Otto Cycle,

http://library.thinkquest.org/C006011/english/sites/ottomotor.php3?v=2

The Formula SAE team

Documents

Emc 2 Lecture 6