Engine Control System for Intake Manifold Icing Prevention
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Solution Overview
Problem
Existing engine systems fail to effectively prevent intake manifold icing during extended idle periods in cold conditions, leading to impaired combustion and potential valve sticking due to insufficient control over moisture levels.
Innovation Solution
A control system that determines intake air temperature and engine speed to selectively initiate operating modes, including increasing engine speed, deactivating Exhaust Gas Recirculation (EGR) cylinders, or shutting down the engine, to manage moisture and prevent icing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the engine idles during extended periods in cold ambient conditions, then the engine remains stationary and ready for operation, but ice forms in the intake manifold due to moisture accumulation
Solution Approach 1:
The control system proactively monitors intake air temperature and engine speed parameters before ice formation occurs. When conditions indicate potential icing (low temperature combined with extended idle time), the system preemptively increases engine speed or deactivates EGR cylinders to raise intake temperature above the dew point, preventing moisture condensation and ice formation before it can occur.
Solution Approach 2:
The system continuously monitors intake air temperature and engine speed, using this feedback to dynamically adjust operating parameters. The control logic compares real-time temperature data against threshold values and automatically modifies engine operation (increasing speed or deactivating EGR) to maintain intake temperature above the dew point, creating a closed-loop control system that prevents icing through continuous adjustment.
2Object-affected harmful factors
If the engine speed is increased during idle operation, then moisture condensation is prevented by raising temperature above dew point, but the engine operates at higher speed than necessary
Solution Approach 1:
The system dynamically adjusts engine speed based on real-time operating conditions rather than maintaining a fixed idle speed. The control logic continuously monitors intake air temperature and engine speed, and only increases speed progressively when temperature approaches the dew point. This dynamic adjustment allows the engine to maintain minimum speed for preventing condensation only when necessary, optimizing the balance between moisture prevention and operational efficiency.
3Object-affected harmful factors
If Exhaust Gas Recirculation (EGR) is deactivated to reduce moisture in the intake manifold, then ice formation is prevented, but combustion efficiency may be affected
Solution Approach 1:
The system segments the engine operation into different cylinder groups, selectively deactivating only the EGR cylinders while maintaining operation of other cylinders. This partial deactivation reduces moisture introduction into the intake manifold sufficiently to prevent icing, while maintaining enough active combustion cylinders to preserve overall engine operation and combustion efficiency. The segmented approach allows targeted moisture control without complete EGR shutdown.
Data Source
AI summary
A method of operating an engine includes determining an intake air temperature and an engine speed. The method includes selectively initiating one of a first operating mode, a second operating mode and a third operating mode based on at least the intake air temperature and the engine speed. The first operating mode includes increasing the engine speed progressively by an incremental speed value. The second operating mode includes deactivating at least one Exhaust Gas Recirculation (EGR) cylinder of the engine. The third operating mode includes shutting down the engine.