Air Charge and Residual Gas Fraction Estimation for a Spark-Ignition Engine Using In-Cylinder Pressure

2017-01-0527

03/28/2017

Features
Event
WCX™ 17: SAE World Congress Experience
Authors Abstract
Content
An accurate estimation of cycle-by-cycle in-cylinder mass and the composition of the cylinder charge is required for spark-ignition engine transient control strategies to obtain required torque, Air-Fuel-Ratio (AFR) and meet engine pollution regulations. Mass Air Flow (MAF) and Manifold Absolute Pressure (MAP) sensors have been utilized in different control strategies to achieve these targets; however, these sensors have response delay in transients. As an alternative to air flow metering, in-cylinder pressure sensors can be utilized to directly measure cylinder pressure, based on which, the amount of air charge can be estimated without the requirement to model the dynamics of the manifold. In this work, an air charge estimation algorithm is proposed, which uses the dynamic cylinder pressure trace data at discrete events in the cycle, and by applying thermodynamics and heat transfer relationships, estimates individual cylinder air charge for each cycle at different engine operating points. In addition, a residual gas mass estimator is incorporated in the algorithm. Estimator output is calibrated based on experimentally determined air charge, which is calculated from the amount of injected fuel in each cylinder and individual wide-band sensor data.
Meta TagsDetails
DOI
https://doi.org/10.4271/2017-01-0527
Pages
13
Citation
Yazdani, A., Naber, J., Shahbakhti, M., Dice, P. et al., "Air Charge and Residual Gas Fraction Estimation for a Spark-Ignition Engine Using In-Cylinder Pressure," SAE Technical Paper 2017-01-0527, 2017, https://doi.org/10.4271/2017-01-0527.
Additional Details
Publisher
Published
Mar 28, 2017
Product Code
2017-01-0527
Content Type
Technical Paper
Language
English