Closed-loop diesel engine combustion phasing control based on crankshaft torque measurements
Journal article, 2014

Methods for closed-loop combustion phasing control in a diesel engine, based on measurements of crankshaft torque, are developed and evaluated. A model-based method for estimation of cylinder individual torque contributions from the crankshaft torque measurements is explained and a novel approach for identification of crankshaft dynamics is proposed. The use of the combustion net torque concept for combustion phasing estimation in the torque domain is also described. Two different control schemes, one for individual cylinder control and one for average cylinder control, are studied. The proposed methods are experimentally evaluated using a light-duty diesel engine equipped with a crankshaft integrated torque sensor. The results indicate that it is possible to estimate and control on a cylinder individual basis using the measurements from the crankshaft torque sensor. Combustion phasing is estimated with bias levels of less than 0.5 crank angle degrees (CAD) and cycle-to-cycle standard deviations of less than 0.7 CAD for all cylinders and the implemented combustion phasing controllers manage to accurately counteract disturbances in both fuel injection timing and EGR fraction.

Internal combustion engines

Electrical & Electronic

Engineering

Estimation algorithms

Engine control

Engine management

Automation & Control Systems

Author

Mikael Thor

Chalmers, Signals and Systems, Systems and control, Automatic Control

Bo Egardt

Chalmers, Signals and Systems, Systems and control, Automatic Control

Tomas McKelvey

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Ingemar Andersson

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Control Engineering Practice

0967-0661 (ISSN)

Vol. 33 115-124

Subject Categories

Control Engineering

DOI

10.1016/j.conengprac.2014.08.011

More information

Created

10/7/2017