This document discusses electronic control units (ECUs) and engine management systems (EMSs) for vehicle engines. It lists common sensors used in EMSs, including primary sensors like the manifold absolute pressure (MAP) sensor and mass air flow (MAF) sensor. It describes the functions of control systems in different stages and standard ECU modules like the powertrain control module. It outlines the advantages of ECUs/EMSs and features like onboard diagnostics. It also discusses auto tuning through reflashing the ECU software map.

1. ECU/EM
S
Car engine
13me80 Khan Fahad
13me81 Khan Gulfam
Presented by
Prof . Incharge
Arshad Qureshi

3. OPERATION
PARAMETERS
Power/Mech.
Efficiency
A/F Ratio
Volumetric
Efficiency
Specific O/P
Specific Fuel
Consumptn
Thermal
Eff/Ht. Balance
Exhaust
Smoke
Effective Pr’
Torque

4. Sensor
I/P
ECU
Stage
Actuator
O/P
EMS
SCHEMATI
C

5. SENSOR LIST
PRIMARY
MAP
MAF
Crankshaft position
Oxygen
VR Tacho
Throttle Position
Knock Sensor
Engine RPM
Intake Air TEMP
SECONDARY
Transmission fluid
temp
Brake force meter
Tire Pressure
TSS-Turbo Speed
Engine Coolant Temp
NEUTRAL START
A/C Compressor
Relay
TERTIARY
Blind-Spot
Parking
Speed
Door Closure
Proximity
Curb Sensor
Stop Light
Head Light

6. CONTROL
SYSTEMS
• Mechanical Design Solution
• Non-adaptiveSTAGE I
• Hardwired Chip
• Application Specific
• Non Programmable
STAGE II
• Common base hardware
• ProgrammableSTAGE III

7. Standard ECU
Systems
Airbag Control
Module
Body Control
Module
PSCU-Steering
Power train
Control
Module(PCM)
HMI
BCU/ABS/ESC TCU
DCU

8. Power-train Control
Module [PCM]
 SENSOR INPUTS:
 MAF/MAP- Intake air
density
 VR TACHO- Engine RPM
 CR POS- Crankshaft
Angle
 IDLE SET-Idle Speed
 THROTTLE POS
 KNOCK
 TRANSMISSION ECU
 CONTROL OUTPUT:
 A/F Ratio- Inj. Timing/Pr
 Ig. Timing
 Idle Speed Set
 VVT
 Transient Fueling
 Gear Control Ig. Cutoff
 Rev Limit
 Turbo Waste-gate limit

9. ADVANTAGES
 Ease of Control
 Adaptable to multiple scenarios
 Very low cost compared to mechanical systems
 Occupy lesser space-compact engine bay
 Less complicated design
 Zero wear

10. FEATURES
 SERVICE SETTING:
 List of service
parameters
 Range of acceptable
values OR time limits
(modifiable)
 Service Indicator Light
 Program reset
 OBD-
 On Board Diagnostics
 Self detection of possible
faults
 Sensor scanning
subsystems
 Fault codes stored in ECU
memory
 All cars after 1996 OBD-II
compliant

15. AUTO TUNING
 Software on ECU known as a map
 New maps can be loaded to ECU [ process known as re-
mapping or flashing]
 Complete access to parameters such as fuel injection
quantity, boost pressure, ignition timing, idle speed
setting
 No costly equipment required, laptop, Tuner EMS s/w &
ODB cable
 Plug & play ECU’s with multiple maps available.