Engine Injection Management for Particulate Emission Reduction
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Solution Overview
Problem
Internal combustion engines, particularly direct injection engines, face challenges in reducing particulate emissions, especially when cold, due to existing strategies for switching between single-shot and multi-shot injection regimes being inadequate in optimizing emissions under varying engine conditions.
Innovation Solution
A method that dynamically manages the transition between single-shot and multi-shot injection regimes based on engine parameters, limiting the duration of multi-shot injection and adapting to engine operating points by defining multiple multi-shot regimes, including two- or three-shot injections, and anticipating changes in load gradients to optimize particulate emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If multi-shot injection regime is used when engine is cold, then particulate emissions are reduced, but injection control complexity increases
Solution Approach 1:
The injection regime dynamically switches between single-shot and multi-shot modes based on transient duration and engine conditions. The system adapts the injection strategy in real-time, using multi-shot when transient duration exceeds a threshold and single-shot otherwise, thereby reducing particulate emissions during cold operation while managing control complexity through condition-based adaptation.
Solution Approach 2:
The system changes the injection regime parameter based on the transient duration parameter. When the transient duration parameter exceeds a predetermined threshold, the injection regime parameter switches from single-shot to multi-shot mode. This parameter-based control enables automated optimization of emissions without requiring complex manual intervention.
2Object-generated harmful factors
If multi-shot injection regime is extended beyond predetermined time interval, then emissions continue to be optimized, but engine response time increases
Solution Approach 1:
The system applies periodic action by limiting multi-shot injection to a predetermined time interval following a transient event. The injection strategy is applied periodically only when transients occur, rather than continuously, which optimizes emissions during the critical transient period while avoiding unnecessary extension that would delay engine response and increase fuel consumption during steady-state operation.
Solution Approach 2:
The system rushes through the multi-shot injection regime within a strict time interval to quickly reduce emissions during transients, then skips back to single-shot mode. This time-constrained approach ensures rapid emission reduction without prolonged multi-shot operation that would increase response time and reduce overall engine efficiency.
3Device complexity
If single-shot injection regime is used continuously, then injection control is simplified, but particulate emissions increase during transients
Solution Approach 1:
The system dynamically adapts between single-shot and multi-shot injection regimes based on real-time detection of transient conditions and duration thresholds. During steady-state operation, single-shot mode maintains simplicity, while during transients exceeding the duration threshold, multi-shot mode activates to reduce emissions, achieving optimal balance between control simplicity and emission performance.
Solution Approach 2:
The injection system performs self-service by automatically detecting transient conditions and selecting the appropriate injection regime without external intervention. The control unit monitors engine parameters, determines when transients occur based on the predetermined duration parameter, and autonomously switches between injection modes, maintaining simplicity while addressing emission concerns.
Data Source
AI summary
This method of injection management in a direct-injection engine involves shifting from a so-called single-injection mode (Init 1 pulse), in which the major portion of the quantity of fuel injected during a combustion cycle is injected in one go, to a so-called multi-injection mode (MPL active), in which several successive injections are carried out in order to inject fuel during a combustion cycle, and vice versa. The multi-injection mode is chosen when a condition based on one or more parameter(s) of the engine is fulfilled (MPL cdn ok). The multi-injection mode is limited to a predefined time interval (Tact_MPL_max) even if, at the end of the interval, the condition for adopting the multi-injection mode is still fulfilled.