Closed-Loop Control of Combustion Phasing in an HCCI Engine Using VVA and Variable EGR
A homogeneous charge compression ignition (HCCI) engine requires closed-loop control of combustion phasing for reliable operation. Variable valve actuation (VVA) has previously been shown to enable cycle-to-cycle, cylinder-individual control with high precision, but suffers from a narrow operating range. Adding variable exhaust gas recirculation (EGR) to the closed-loop control structure can extend the operating range. A mid-ranging control structure is presented here for combined VVA and EGR actuations in a multi-cylinder engine. The control structure is simple to implement and preserves the fast, cylinderindividual, and precise actuation of the VVA system while extending the operating range. Experimental results verify the performance of the control structure.
- Technology and Engineering
5th IFAC Symposion on Advances in Automotive Control