Closed-loop diesel engine combustion phasing control based on crankshaft torque measurements

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.

[1]  Dinu Taraza,et al.  Engine friction model for transient operation of turbocharged, common rail diesel engines , 2007 .

[2]  Mikael Thor,et al.  Estimation of Combustion Phasing Using the Combustion Net Torque Method , 2011 .

[3]  Tomas McKelvey,et al.  Instantaneous Crankshaft Torque Measurements - Modeling and Validation , 2003 .

[4]  John A. Nelder,et al.  A Simplex Method for Function Minimization , 1965, Comput. J..

[5]  Christer Wallin,et al.  Engine Monitoring of a Formula 1 Racing Car Based on Direct Torque Measurement , 2002 .

[6]  Rolf Johansson,et al.  Closed‐loop combustion control of homogeneous charge compression ignition (HCCI) engine dynamics , 2004 .

[7]  Christer Wallin,et al.  Condition Based Maintenance of a Formula 1 Racing Car based on Direct Torque Measurement , 2009 .

[8]  Simon Haykin,et al.  Neural Networks: A Comprehensive Foundation , 1998 .

[9]  Dimitrios T. Hountalas,et al.  Application and Evaluation of a Detailed Friction Model on a DI Diesel Engine with Extremely High Peak Combustion Pressures , 2002 .

[10]  Mikael Thor,et al.  Evaluation of a Closed Loop Spark Advance Controller Based on a Torque Sensor , 2008 .

[11]  Uwe Kiencke,et al.  Automotive Control Systems , 2005 .

[12]  Christer Wallin,et al.  Instantaneous Crankshaft Torque Measurement in Cars , 1996 .

[13]  Mikael Thor,et al.  Estimation of Diesel Engine Combustion Phasing from Crankshaft Torque Data , 2009 .

[14]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[15]  Stefan Larsson,et al.  Self-optimising control of an SI-engine using a torque sensor , 2008 .

[16]  Tomas McKelvey,et al.  System identification of the crankshaft dynamics ina 5 cylinder internal combustion engine , 2006 .

[17]  T. McKelvey,et al.  A system inversion approach on a crankshaft of an internal combustion engine , 2004, 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601).

[18]  Mikael Thor,et al.  Modeling, Identification, and Separation of Crankshaft Dynamics in a Light-Duty Diesel Engine , 2009 .

[19]  Mikael Thor,et al.  Using combustion net torque for estimation of combustion properties from measurements of crankshaft torque , 2014 .

[20]  Bengt Johansson,et al.  Extracting Cylinder Individual Combustion Data from a High Precision Torque Sensor , 2010 .

[21]  Lloyd Withrow,et al.  Motion Pictures of Engine Flames Correlated with Pressure Cards , 1938 .

[22]  Christer Wallin,et al.  Balancing of Individual Cylinders in a V8 Diesel Engine Based on Crankshaft Torque Measurement , 1998 .

[23]  John B. Heywood,et al.  Heat Release Analysis of Engine Pressure Data , 1984 .