A physics-based approach to the control of homogeneous charge compression ignition engines with variable valve actuation

Author:

Shaver G M1,Roelle M J1,Caton P A1,Kaahaaina N B1,Ravi N1,Hathout J-P2,Ahmed J2,Kojic A2,Park S2,Edwards C F1,Gerdes J C1

Affiliation:

1. Department of Mechanical Engineering, Stanford University, Stanford, California, USA

2. Research and Technology Center, Robert Bosch Corporation, Palo Alto, California, USA

Abstract

Homogeneous charge compression ignition (HCCI) is a promising low-temperature combustion strategy for reducing NOx emissions and increasing efficiency in internal combustion engines. However, HCCI has no direct combustion initiator and, when achieved by reinducting or trapping residual exhaust gas with a variable valve actuation (VVA) system, becomes a dynamic process as the temperature of the residual gas couples one cycle to the next. These characteristics of residual-affected HCCI present a challenge for control engineers and a barrier to implementing HCCI in a production engine. In order to address these challenges, this paper outlines physics-based control strategies for both the VVA system and the HCCI combustion process. The results show that VVA system control can provide arbitrary valve timings on a cycle-to-cycle basis, enabling tight control of HCCI. By abstracting these valve timings further into an inducted gas composition and an effective compression ratio, model-based controllers can be developed to control simultaneously load and combustion timing in an HCCI engine.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Ocean Engineering,Aerospace Engineering,Automotive Engineering

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