EDC control

1. 1

2. 2
EDC Components overview
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Metering Unit
(Fuel quantity control)
Input Sensors / Switches Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
Signal Inputs / Signal Evaluation
Signal Processing &
Quantity Calculation (Torque
Structure)
Injection Control (Fuel Quantity
/ start of Injection / Pilot
Injection & Timing)
Rail pressure Control
Engine
Vehicle
EGR Sensor
EGR DC Motor
(EGR position control)
Injector
(Fuel injection)
Oil pressure & temp
Sensor

3. 3
EDC Components overview
Input Sensors / Switches
Sense engine rpm through crankshaft speed
Sense cylinder TDC position using Cam trigger wheel
Sense engine coolant temperature
Sense fuel pressure inside common rail
Sense boost pressure of air sent inside engine
Sense EGR position
Sense accelerator pedal position
Sense accelerator pedal position
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor
Sense engine oil pressure and temperature

4. 4
EDC Components overview
Metering Unit
(Fuel quantity control)
Output Actuators
EGR DC Motor
(EGR position control)
Injector
(Fuel injection)
Controls the amount of fuel being sent inside the High pressure pump
Injects the fuel inside the combustion chamber – actuated by a solenoid
Actuates the EGR valve to open according to the required lift

5. 5
➢ The load requirement is understood from the
ACC pedal position.
➢ Based on the engine running rpm and the acc
pedal position, rail pressure to be maintained is
arrived and correspondingly the metering unit
is actuated.
➢ Based on the rail pressure, the energizing time
for the injector solenoid is arrived.
➢ Based on the CAM sensor, the engine at TDC is
arrived and the injector of the corresponding
cylinder is actuated.
EDC Components overview
Engine Functioning
Metering Unit
(Fuel quantity control)
Input Sensors / Switches Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
EGR DC Motor
(EGR position control)
Injector
(Fuel injection)
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor

6. 6
➢ Boost pressure is monitored and the input is
provided to ECU to adjust the fuel quantity and
injection quantity accordingly.
➢ Coolant temperature and oil temperature is
sensed to cut down the power of engine under
high coolant temperature / low oil pressure
temperature condition
EDC Components overview
Engine Functioning
Metering Unit
(Fuel quantity control)
Input Sensors / Switches Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
EGR DC Motor
(EGR position control)
Injector
(Fuel injection)
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor

7. 7
➢ Based on the engine operating conditions, the
amount of EGR to be sent inside the engine is
decided.
➢ The existing position of EGR valve is sensed
and accordingly input is provided to DC motor
of EGR valve to lift EGR valve to desired
position.
EDC Components overview
Engine Functioning
Metering Unit
(Fuel quantity control)
Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
Injector
(Fuel injection)
EGR DC Motor
(EGR position control)
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor
Input Sensors / Switches

8. 8

9. 9
Engine Protection Emission control (OBD)
➢ Engine function is controlled by the sensors and
actuators.
➢ Any failure of sensor / actuator may lead to a
severe damage to engine / vehicle and may even
lead to safety issues.
➢ Monitoring and control is required to save the
engine from failure.
➢ Any failure of sensor / actuator may
lead to increased emission from the
exhaust which will not be accepted
by the regulatory bodies.
➢ Monitoring and control is required to
limit the exhaust from engine.
Diagnostic management
Why do we need it ?

10. 10
➢ When monitoring parameter
exceeds the set limit.
➢ When the supply is not meeting
the demand requirement.
➢ When sensor fails.
➢ When actuator fails.
➢ When wiring harness fails.
➢ When ECU fails.
Diagnostic management
When do we need it ?
Metering Unit
(Fuel quantity control)
Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
Injector
(Fuel injection)
EGR DC Motor
(EGR position control)
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor
Input Sensors / Switches

11. 11
Diagnostic management?
How does it do?
Reactions on Engine
➢ Torque reduction
➢ Speed limitation
➢ Torque + speed limitation
➢ Limp home
➢ Engine shutoff
Engine torque will be reduced by 40% or 80%
Engine maximum rpm will be limited to 1250 /
1750 rpm
Both the above
Both the above
Engine will not start

12. 12
P0036
➢ Any failure will trigger an error code
➢ That error code will be stored in ECU memory
along with the conditions at that time .
➢ Based on the error code, the reaction is
triggered.
➢ The error code and the conditions can be read
from Diagnostic tester
Diagnostic management
What does it do?
Metering Unit
(Fuel quantity control)
Electronic Control Unit
EDC17 H-Bridge
Output Actuators / Lamp
Injector
(Fuel injection)
EGR DC Motor
(EGR position control)
Crank Speed Sensor
Cam Speed Sensor
Coolant Temp Sensor
Rail Pressure Sensor
Boost Temp &
Pressure Sensor
Accelerator Pedal
Sensor
Vehicle Speed Sensor
Engine
Vehicle
EGR Sensor
Oil pressure & temp
Sensor
Input Sensors / Switches

13. 13 Ashok Leyland Presentation
Level of troubleshooting
Component wise….
External
Component (sensor)
Wiring Harness
Component (Actuator)
ECU
➢ Mechanical failures
➢ LPC issues
➢ Failures of sensor base function
which can be verified by resistance
and voltage value
➢ Continuity issue
➢ Pin out repair (Requires
training & Tools)
➢ Failures of actuator base
function which can be
verified by actuator test
using diagnostic tool
➢ ECU malfunction
➢ ECU dataset
➢ ECU

14. 14