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Indirect sensing of cylinder pressure for feedback control of combustion in IC engines

The state-of-the-art for indirect sensing of IC engine cylinder pressures is examined. First, the philosophy of cylinder pressure reconstruction is explained, followed by a discussion of some of the various indirect approaches that can be used, plus their associated data requirements and related problems. The focus then switches to a new inverse model for reconstructing steady-state and transient engine cylinder pressure using measured crank kinematics. This is an adaptive nonlinear time-dependent relationship relating cylinder pressure and measured crank kinematics in a time-domain format (rather than in crank-angle-domain). This approach is shown under transient engine conditions to very successfully reconstruct peak pressure very efficiently i.e. typically within 5% of target, and location of peak pressures within ±1° crank angle (CA), making it wholly suitable for real-time implementation.