ENGINE 9 Unique CR Strategies ● Individual Injector Characterization (I2C) ● Accelerometer Pilot Control (APC) ● Cylinder balancing : Strategy to balance engine speed difference between cylinder to cylinder by modifying fuel delivery Cyclic variations during flywheel rotation maintained minimum by monitoring flywheel speed continuously ● Anti-Oscillation Strategy (AOS): Strategy to prevent engine speed oscillations (Derivability) Fuel delivery is slewed based on various inputs like rpm, pedal position, engine temperature etc. Jerks during sudden accelerations minimised ● Minimised individual injector spread on engine ● Minimised injector drift over lifetime ● Control of smallest pilot injection quantities over lifetime ● Better control of multiple injection ● The accelerometer strategy is based on the detection of the MDP (Minimum Drive Pulse) which generates combustion ● MDP is the pulse required to inject the smallest fuel quantity Why APC ● Running in of Injectors - possible injector drift ● MDP changes due to physical tolerances ● Constantly update MDP to maintain same fuel quantity over lifetime Opearation APC compensates possible injection quantity drift by: ● actively monitoring this drift on vehicle and applying a compensation equal to the difference with the nominal for every injection Advantages ● Small pilot quantities are under control ● Enhanced diagnostic and engine protection against fuel supply system failure. ● No vehicle dispersion for noise and emissions ● No vehicle drift during vehicle life for noise and emissions ● Driveability in transient is improved due to a better pressure regulation Note: ● The pilot pulse is increased until a knock sensor signal is detected ● Knock sensor “listens” to combustion noise from each cylinder separately ● ECU updates MDP every 60 minutes Precautions: ● Bleeding shouldnot bedoneby looseningHPpipes ● HPpipes are one time use only – avoidunnecessary removal ● Do not leave inlets and outlets of CR components exposed to dirt – Cap immediately ● Flushing of CR components should not be done ● It will introduce dirt ● Do not remove battery connectionwhen key is ON ● Do not spray water on the ECU ● Sensor connections should not be removed unnecessarily ● HP pipes should not be bent and force should not be applied ● Fallenor brokenCRcomponents shouldnot beused ● Avoid entering Test bed while engine is running at high speed and high load as any high pressure leakagemay cause injury ● Monitor battery voltage continuously - recharge battery if voltage drops below10Volts ● I2C values must be entered correctly according to cylinder order ● Drainwaterfromfilterandsedimenteratregularintervals Individual Injectors Characterisation (I 2 C) Manufacturing tolerances of injector components: ● Scattering of fuel delivery and opening delay from injector to injector ● I2C (16 digit code) for correcting the fuel delivery and opening delay ● Exact defined injection quantity ● Equals injection quantity from injector to injector ● Important to achieve future emission legislation levels ● Manufacturing process control Precaution I2C values must be fed in correct cylinder order.Wrong entry will lead to unwanted engine vibrations and noise Accelerometer Pilot Control strategy (APC) What is Accelerometer ● Accelerometer is a Knock Sensor which listens to Combustion knock
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