Advanced combustion concepts such as Reactivity Controlled Compression Ignition (RCCI) demonstrate very high thermal efficiencies combined with ultra low NOx emissions. As RCCI is sensitive for operating conditions, closed-loop control is a crucial enabler for stable and robust combustion. The feedback design is complex due to the coupling between inputs, such as intake manifold temperature, blend ratio (BR), and air-to-fuel ratio (λ), and, on the other hand, combustion parameters. Contrary to earlier, parallel SISO approaches, a multivariable feedback control strategy is applied, which uses a new combination of control parameters. Following the linearisation of a validated multi-zone RCCI combustion model, a MIMO feedback control strategy is designed. This cycle-to-cycle control strategy uses diesel injection timing, diesel fuel quantity, and natural gas (NG) fuel quantity information to track the desired engine load, ignition delay, and a new control parameter: BR. The designed controller is validated with simulation cases for disturbance rejection and simultaneous multivariable reference tracking. Simulation results demonstrate robust performance, effective decoupling action, and fast settling time (within 3 engine cycles) of the designed controller.
Robust multivariable feedback control of natural gas-diesel RCCI combustion
2016-06-23
Indrajuana , A , Bekdemir , C , Luo , X & Willems , F P T 2016 , ' Robust multivariable feedback control of natural gas-diesel RCCI combustion ' , IFAC-PapersOnLine , vol. 49 , no. 11 , pp. 217-222 . https://doi.org/10.1016/j.ifacol.2016.08.033
Article (Journal)
Electronic Resource
English
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