Locomotive Engine Injection Timing Control via Bank-Specific MAT Sensors
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Solution Overview
Problem
Locomotive engine control systems face challenges in accurately adjusting injection timing due to uneven degradation rates of intake components like intercoolers and manifold air temperature (MAT) sensors, leading to potential elevated exhaust emissions and reduced compliance with emission regulations.
Innovation Solution
Implementing a system with dedicated MAT sensors for each bank of cylinders and an engine controller that adjusts injection timing based on an unevenly weighted average of temperatures from both banks, using serial communication to coordinate with a locomotive controller for diagnostic routines and adjustments, thereby detecting intercooler degradation and optimizing engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bank-specific MAT sensor is used, then device complexity is reduced, but measurement precision deteriorates because component degradation in the other bank goes undetected
Solution Approach 1:
The patent divides the engine into two separate banks with dedicated MAT sensors for each bank. This segmentation allows independent monitoring of temperature and degradation for each bank, enabling the system to detect component degradation in any specific bank without compromising overall measurement precision.
2Temperature
If bank-specific intercoolers are used, then cooling performance is improved, but reliability deteriorates because intercoolers degrade at different rates and uneven cooling occurs
Solution Approach 1:
The patent implements feedback control by continuously monitoring MAT for each bank and using this information to adjust injection timing independently for each bank. This feedback mechanism compensates for intercooler degradation differences and maintains consistent emissions control despite varying cooling performance between banks.
Solution Approach 2:
The system dynamically adjusts injection timing based on real-time temperature readings from each bank. The controller modifies fuel injection parameters adaptively in response to changing thermal conditions, allowing the engine to maintain optimal emissions performance even as intercoolers degrade at different rates.
3Ease of operation
If injection timing is adjusted based on average temperature, then ease of operation is improved, but manufacturing precision deteriorates due to uneven component degradation
Solution Approach 1:
The patent segments the control approach by treating each bank independently rather than using a single average temperature reading. Each bank has its own MAT sensor and dedicated injection timing control, allowing precise emissions control for each bank while maintaining operational simplicity through automated individual control.
Data Source
AI summary
Methods and systems are provided for operating an engine including a first and a second bank of cylinders. One example method comprises, adjusting engine injection timing based on a first temperature of a first intake of the first bank and a second temperature of a second intake of the second bank.