Two air path observers for turbocharged SI engines with VCT

Abstract

Nowadays, downsizing is a major way to reduce fuel consumption and pollutant emissions of Spark Ignition (SI) engines. In downsized engines, new air path management systems such as turbocharging or Variable Camshaft Timing (VCT) are including, and an efficient control of the air actuators is required for engine torque control. Two non-linear estimators are proposed to estimate non-measured variables of the air path. The first one is an incylinder air mass observer that combines feedforward neural static models and a Linear Parameter Varying (LPV) polytopic observer. The second one is a neural estimator of the burned gas and the air scavenged masses. Test bench results on a turbocharged SI engine with VCT show the real time applicability and good performance of the proposed estimators. Finally, a strategy for developing the engine supervisor is presented.

Physically based volumetric efficiency model for diesel engines utilizing variable intake valve actuation

“…Volumetric efficiency is defined by Taylor [3] as the ratio of the mass of charge inducted into the cylinder to the mass of the charge mixture that would occupy the displaced piston volume at the inlet density. The determination of volumetric efficiency is critical to accurate charge estimation since it directly influences the speed–density charge mass calculation [1, 6, 7].…”

Intake Air Mass Observer Design Based on Extended Kalman Filter for Air-Fuel Ratio Control on SI Engine

“…The research [6] proposed an air mass flow estimator design with model bias correction for a turbocharged diesel engine by off-line calculation. An in-cylinder air mass observer was implemented in [7], which combined the feedforward neural static model and a linear parameter varying (LPV) polytopic observer. Some air charge observers have been reported in [8,9] on the SI engine and the experimental results showed that the input estimation techniques could enhance the control performance.…”

Scalable decay factor and ISS gain for disturbed linear polytopic discrete-time systems

“…Let us consider the system investigated in [2], the airpath of a turbocharged Spark Ignition engine. Here, we focus on the subsystem from which the air flow trapped into the cylinders can be estimated.…”

“…,z k 2 . l n 2 : the Hilbert space of right-sided square summable real vector sequences of vectors of dimension n. l n ∞ : the Banach space of right-sided bounded sequences z of real vectors of dimension n. z 2 …”