Advanced

Cylinder Pressure Based Virtual Sensor for In-Cycle Pilot Mass Estimation

Jorques Moreno, Carlos LU ; Stenlaas, Ola LU and Tunestal, Per LU (2018) In SAE Technical Papers 2018-April.
Abstract

In this paper, a virtual sensor for the estimation of the injected pilot mass in-cycle is proposed. The method provides an early estimation of the pilot mass before its combustion is finished. Furthermore, the virtual sensor can also estimate pilot masses when its combustion is incomplete. The pilot mass estimation is conducted by comparing the calculated heat release from in-cylinder pressure measurements to a model of the vaporization delay, ignition delay and the combustion dynamics. A new statistical approach is proposed for the detection of the start of vaporization and the start of combustion. The discrete estimations, obtained at the start of vaporization and the start of combustion, are optimally combined and integrated in a... (More)

In this paper, a virtual sensor for the estimation of the injected pilot mass in-cycle is proposed. The method provides an early estimation of the pilot mass before its combustion is finished. Furthermore, the virtual sensor can also estimate pilot masses when its combustion is incomplete. The pilot mass estimation is conducted by comparing the calculated heat release from in-cylinder pressure measurements to a model of the vaporization delay, ignition delay and the combustion dynamics. A new statistical approach is proposed for the detection of the start of vaporization and the start of combustion. The discrete estimations, obtained at the start of vaporization and the start of combustion, are optimally combined and integrated in a Kalman Filter that estimates the pilot mass during the vaporization and combustion. The virtual sensor was programmed in a Field Programmable Gate Array (FPGA), and its performance tested in a Scania D13 Diesel engine. The experimental results showed that the method can effectively improve the in-cycle pilot mass estimation. The accuracy, quantified by the average error between the actual injected mass and the estimated mass, was improved from an induced initial bias error of ±3 mg/st to a final error of ±0.1 mg/st, with a precision of ±0.45 mg/st. A level of precision of ±0.5 mg/st was already obtained at the peak of the pilot heat release. The suggested method is robust against changing operating conditions based on the calibration points. With the proposed parametrization, this is limited to regions where the parameter dependence is linear. The maximum calibration bias error for points out of the calibration range was within ±0.5 mg/st, with a precision of ±0.8 mg/st. In addition, the method was found to be robust against most input measurement errors and parameter bias. The major error sensitivity was detected for TDC offset. Different fuels than those used for calibration were found to result in an error proportional to the lower heating value error. The estimation framework can easily integrate more complex models to allow the estimation of greater pilot masses and multiple injections. The pilot mass estimation can be used to predict the pilot combustion and its effect on the main injection. This allows for better in-cycle controllability i.e. ability to adjust the main injection timing and duration, cycle-to-cycle control and adaptation of pilot and main injections. The closed-loop control of the combustion enables improved engine performance and efficiency, and reduced emissions variability.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SAE Technical Papers
volume
2018-April
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85045523805
ISSN
0148-7191
DOI
10.4271/2018-01-1163
language
English
LU publication?
yes
id
ce08abe2-b6c8-4927-b8f0-a9696c28839c
date added to LUP
2018-04-27 14:54:11
date last changed
2018-10-03 12:09:22
@article{ce08abe2-b6c8-4927-b8f0-a9696c28839c,
  abstract     = {<p>In this paper, a virtual sensor for the estimation of the injected pilot mass in-cycle is proposed. The method provides an early estimation of the pilot mass before its combustion is finished. Furthermore, the virtual sensor can also estimate pilot masses when its combustion is incomplete. The pilot mass estimation is conducted by comparing the calculated heat release from in-cylinder pressure measurements to a model of the vaporization delay, ignition delay and the combustion dynamics. A new statistical approach is proposed for the detection of the start of vaporization and the start of combustion. The discrete estimations, obtained at the start of vaporization and the start of combustion, are optimally combined and integrated in a Kalman Filter that estimates the pilot mass during the vaporization and combustion. The virtual sensor was programmed in a Field Programmable Gate Array (FPGA), and its performance tested in a Scania D13 Diesel engine. The experimental results showed that the method can effectively improve the in-cycle pilot mass estimation. The accuracy, quantified by the average error between the actual injected mass and the estimated mass, was improved from an induced initial bias error of ±3 mg/st to a final error of ±0.1 mg/st, with a precision of ±0.45 mg/st. A level of precision of ±0.5 mg/st was already obtained at the peak of the pilot heat release. The suggested method is robust against changing operating conditions based on the calibration points. With the proposed parametrization, this is limited to regions where the parameter dependence is linear. The maximum calibration bias error for points out of the calibration range was within ±0.5 mg/st, with a precision of ±0.8 mg/st. In addition, the method was found to be robust against most input measurement errors and parameter bias. The major error sensitivity was detected for TDC offset. Different fuels than those used for calibration were found to result in an error proportional to the lower heating value error. The estimation framework can easily integrate more complex models to allow the estimation of greater pilot masses and multiple injections. The pilot mass estimation can be used to predict the pilot combustion and its effect on the main injection. This allows for better in-cycle controllability i.e. ability to adjust the main injection timing and duration, cycle-to-cycle control and adaptation of pilot and main injections. The closed-loop control of the combustion enables improved engine performance and efficiency, and reduced emissions variability.</p>},
  author       = {Jorques Moreno, Carlos and Stenlaas, Ola and Tunestal, Per},
  issn         = {0148-7191},
  language     = {eng},
  month        = {01},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Technical Papers},
  title        = {Cylinder Pressure Based Virtual Sensor for In-Cycle Pilot Mass Estimation},
  url          = {http://dx.doi.org/10.4271/2018-01-1163},
  volume       = {2018-April},
  year         = {2018},
}