Gaussian Process Soot Model for Transient Engine Control
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Solution Overview
Problem
Soot emissions from turbocharged diesel engines are significantly higher during transient operation due to poor performance at low loads and speed conditions, primarily because the turbocharger's inertia leads to a delayed increase in airflow, resulting in a lower air-fuel ratio and increased soot emissions.
Innovation Solution
A soot control system that utilizes a Gaussian process model in an electronic control unit (ECU) to calculate and compare actual and desired air-fuel ratios, generating a soot offset value to provide real-time transient corrections, thereby supplementing the existing steady-state soot model map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the fuel system responds rapidly to increased fueling demand after load or speed increase, then the fueling response is improved, but the air fuel ratio becomes lower and soot emissions increase
Solution Approach 1:
The system performs preliminary action by predicting the future air fuel ratio based on the known inertia characteristics of the turbocharger. The controller anticipates the delayed airflow response and pre-adjusts fuel injection to compensate for the expected low air fuel ratio condition during the transient period, thereby preventing soot emissions before they occur.
Solution Approach 2:
The system uses feedback by continuously monitoring actual engine operating conditions and comparing them with predicted values. The controller adjusts fuel injection based on the difference between actual and predicted air fuel ratios, creating a closed-loop control system that adapts to real-time engine behavior during transient operations.
2Reliability
If the turbocharger system inertia is accounted for, then the transient performance is improved, but the control system complexity increases
Solution Approach 1:
The system applies parameter changes by modifying the fuel injection quantity based on predicted air fuel ratio variations caused by turbocharger inertia. The controller adjusts fueling parameters dynamically during transient conditions rather than using fixed steady-state maps, adapting the fuel injection strategy to the changing aerodynamic and inertial conditions of the turbocharger system.
Data Source
AI summary
A soot control system for an internal combustion engine includes an internal combustion engine with a plurality of cylinders. A plurality of engine operating condition sensors are provided. An electronic control unit (ECU) with one or more processors and a non-transitory computer-readable medium storing computer-executable instructions, includes a Gaussian process model. The ECU is configured to receive data from the plurality of engine operating condition sensors. The ECU is configured to calculate a soot parameter of an actual air fuel ratio and calculate a soot parameter of a desired air fuel ratio using the Gaussian process model with the engine operating condition data as input to the Gaussian process model and compare the soot parameter of an actual air fuel ratio and a soot parameter of a desired air fuel ratio to generate a soot offset value.