KNOCK DETECTION AND CONTROL ALGORITHM OF DIESEL-DUAL-FUEL ENGINE USING PRACTICAL MULTIVARIABLE CONTROL
Keywords:
Knock Control, DDF Engine, ECU, Natural GasAbstract
The detection and reduction of Diesel-Dual-Fuel engine knock is the important function of powertrain control to ensure engine longevity. In this paper, appropriate knock detection system of DDF engines, based on a Motorola ProSAK IC, was implemented. The electronic control unit (ECU) received high-frequency vibration signal from a piezo-electric knock sensor. The knock detection algorithm modified raw signal into knock intensity which use for monitoring the knock occurrence. The controller adjusted control variables simultaneously in order to reduce the unpredictable engine knock. Those variables are diesel injection
timing, diesel quantity and natural gas quantity. 2KD-FTV engine on a Toyota Hilux Vigo were converted for dual fuel mode. Experimental results from road tests showed that engine knock was reduced by the control scheme especially during transient operation.
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