Kn ppt aum221 1 1 intro basics
- 1. Engine Performance Basic Electronics and Computer Systems
- 2. Computers can be called CPU central processing unit controls all electronic system ECM engine control module controls engine systems PCM powertrain control module controls engine & transmission only TCM transmission control module controls transmission & traction BCM body control module controls body systems Generally for our learning purposes, we’ll group them all as one
- 3. Computer Functions • Input – Is a signal sent from an input device. • Processing (logic) – The computer compares input information to programmed instructions. • Storage – The programmed instructions are stored in the computer’s memory. • Output – Is a command given by the computer to operate an output device.
- 4. Let’s at INPUTS first • All inputs have same basic function detect a mechanical condition, position, chemical state temperature, or electrical value change it into an electrical signal to be used by a computer.
- 5. INPUTS can be either Switches or Sensors
- 6. Switches something turned on or off either by a person, or a device switches are either normally open or normally closed they send an digital input signal to the pcm some switches switch the ground side some switch the power side if they switch power, it can be B+ or Reference Voltage
- 7. Switches PSP Power Steering Pressure Switch OD Overdrive Switch CP Clutch Pedal Position Switch IGN Ignition Switch
- 8. PNP Park Neutral Switch BLS Brake Light Switch ACC A/C Clutch Switch TS Temperature Switch
- 9. Sensors provide feedback information (instead of on / off) • Each sensor has a specific job. ✓confirms position or action ✓reports voltage changes • All sensors are either reference voltage sensors or voltage generating sensors.
- 10. Various Sensors CTS Coolant Temperature Sensor ATS Air Temperature Sensor TPS Throttle Position Sensor ISC Idle Speed Control Sensor CRK Crankshaft Position Sensor
- 11. CAM Camshaft Position Sensor MAP Manifold Absolute Pressure Sensor KNOCK Sensor E G R Position Sensor MAF Mass Air Flow Sensor
- 12. Oxygen Sensors One Wire Two Wire Three Wire Four Wire
- 13. Remember this statement ? • All sensors are either reference voltage sensors or voltage generating sensors. Notice..... they all have to do with voltage They must either create their own voltage or respond to the battery voltage
- 14. Let’s Talk About Reference Voltage Sensors “use of a source of information in Reference means order to ascertain something” What are we “referencing . . . . and why ?
- 15. Remember this is “Reference Voltage” All we have to work with is the vehicles voltage A good battery supplies 12.6 volts A weak battery will supply less
- 16. A good charging alternator can supply 13.5 - 14.5 volts A bad alternator can supply voltage above 14.5 volts or no volts at all leaving you with battery voltage that is decreasing
- 17. Since we are “measuring” or “referencing” something there must be a point where that measurement is always the same A car simply won’t run if the voltage drops below 6 Volts
- 18. So............ to solve this problem The computer sends a constant 5 volts to the sensor That way it can’t be confused with any voltage generated by something other than what the computer sends out
- 19. And it provides a constant point to measure from “reference” 5 For all of the sensors volts that need to measure or “reference” voltage
- 20. Reference Voltage Sensors • Computer sends a constant voltage to the sensor. • The sensor reacts and sends a voltage signal back to t • Reference voltage is normally 5 to 9 volts. • Most are variable resistors or potentiometers.
- 22. So......... inputs can be Switches On or Off 5 Reference voltage feedback sensors volts OR Voltage Generating Sensors they make their own voltage signal
- 23. Voltage Generating Sensors • Produce an input voltage for the control system • Speed sensors • Knock sensors • Hall-effect switches • Oxygen sensors
- 24. How do they produce voltage ? ? • Use magnetic induction. Magnetic Pulse Generators • Also called permanent magnet generators.
- 25. QuickTime™ and a Animation decompressor are needed to see this picture. QuickTime™ and a Animation decompressor are needed to see this picture.
- 26. Current running thru a wire wound around a solid core
- 27. Hall-Effect Switch • Performs the same function as a PM generator
- 28. QuickTime™ and a Animation decompressor are needed to see this picture.
- 29. Let’s at OUTPUTS next Actuators • Solenoids, • Switches, • Relays, lly • Motors. ica as • Electromechanical devices. b
- 30. Solenoids
- 31. What is a solenoid ? A coil of wire, wound tightly around a metallic core, which produces a magnetic field when an electric current is passed through it. They can create a controlled magnetic field and can be used as electromagnets
- 32. QuickTime™ and a GIF decompressor are needed to see this picture. Simplified Control Being a pulsed device with minimal components optimizes solenoids for digital control. This results in faster cycling and higher reliability with fewer interfaces. Uncompromising Reliability Solenoids provide repeatable, predictable performance with a specified life of up to 100 million cycles.
- 33. QuickTime™ and a Animation decompressor are needed to see this picture. QuickTime™ and a Animation decompressor are needed to see this picture.
- 34. Starter solenoid Throttle solenoid Variable Valve solenoid Trans shift solenoid Fuel injector solenoid Idle air control solenoid Fuel Solenoid EGR solenoid Door lock solenoid
- 35. Relays
- 36. Relays are remote control electrical switches that are controlled by another switch Horn Circuit Switch #2 A switch controlled by A switch Switch #1 Horn Switch
- 37. QuickTime™ and a GIF decompressor are needed to see this picture.
- 38. Many relay show their diagram Pay close attention
- 39. Motors
- 40. An electric motor is an electromechanical device that converts electrical energy into mechanical energy QuickTime™ and a QuickTime™ and a GIF decompressor Animation decompressor are needed to see this picture. are needed to see this picture.
- 41. End part 1
Editor's Notes
- #2: aum 221 chpt 22 01