Geely EC715 2009, Workshop Manual

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3. Ignition Advance Angle Calculation and Control
Ignition Angle
Ignition Advance
Angle Calculation
Ignition
Advance Angle
Coolant Temperature
Compensation
Air Temperature
Compensation
Valve Position
Compensation
Acceleration
Compensation
Idle Compensation
Ignition Advance
Angle Compensation
Air Conditioning
Compensation
Enrich
Deceleration
Compensation
FE02-8039b
A. Main Ignition Advance Angle
When the engine temperature is normal, with the throttle
opening, the main ignition angle is the minimum ignition
angle with the optimal torque or the threshold of detonation.
When the throttle is closed, the ignition angle should be less
than optimal torque point for idle stability.
Without affecting driving with a cold engine, in order to
reach the normal operating temperature as quickly as
possible, in the catalytic converter heating process, the
basic ignition angle can be angle other than the minimum
ignition angle with the optimal torque or the threshold of
detonation. This angle should also be delayed as much as
possible without affecting the driving ability.
B. Ignition Advance Angle Adjustment
temperature adjustment, intake air temperature
adjustment, altitude compensation adjustment, idle speed
adjustment, power-enriched adjustment, deceleration fuel
supply adjustment, Air-Conditioning control adjustment,
exhaust gas recirculation adjustment.
C. Acceleration Adjustment
Ignition advance angle acceleration adjustment is used to
mitigate the drive system torque shock caused by engine
speed fluctuations, and also to eliminate possible
detonation during acceleration, so that the acceleration is
smooth.
D. Valve Timing-controlled Ignition Angle Compensation
In order to obtain a better power and torque, system will
enrich the Air-Fuel ratio to achieve the optimal torque and
adjusts the ignition advance to achieve the optimal torque
output.
E. Valve Timing-controlled Ignition Angle Compensation
When the valve timing control system works, the engine's
intake and exhaust overlap angle change will affect the
internal exhaust gas recirculation rate and the cylinder
temperature. According to different valve timing, system
needs to adjust ignition advance angle to ensure that under
current valve timing, the actual ignition advance angle is the
best.
F. Deceleration Fuel Supply Adjustment
When the system exits the deceleration fuel supply control
mode, the ignition angle will be adjusted to make the throttle
closing transition smooth.
G. Air-Conditioning Control Adjustment
When the engine is idling, the Air-Conditioning is turned off.
The ignition angle will be adjusted to make the engine run
smoothly.
2.12.3.4 Electronic Throttle Body Function
Restrictions
1. Forced Shut Down
When ECM reports a malfunction, intake or throttle air flow
control has a malfunction. The control strategy is to stop the
fuel supply, stop the ignition and close the throttle and shut
down the engine.
2. Forced Idle Power Management Mode
When the engine is idling, ETC system can not reliably use the
throttle to control engine power. At this point ETC cancels the
throttle control. The throttle opening is at the default position.
The engine power control is achieved by stopping one cylinder
fuel injection and delaying the ignition angle.
2-596 Control System JL4G15-D Engine
EC718/EC718RV EC715/EC715RV 10/2009