Stochastic Pre-ignition Mitigation via Turbocharger Boost Control
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Solution Overview
Problem
Stochastic pre-ignition (SPI) events in internal combustion engines can occur when combustible matter accumulates and combusts due to low engine vacuum, leading to potential engine damage if not detected and remediated, as existing systems lack effective mitigation strategies for such conditions.
Innovation Solution
An engine control system that includes a timer module, an SPI mitigation module, and a boost control module, which tracks engine operation periods with low vacuum or pressure, generates an SPI signal when predetermined conditions are met, and reduces turbocharger output to prevent SPI by adjusting fueling, spark timing, and boost levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine operates with low vacuum conditions for extended periods, then fuel accumulation and combustible matter buildup occur, but this leads to stochastic pre-ignition events that can damage the engine
Solution Approach 1:
The system performs preliminary detection and mitigation actions before SPI events occur. The timer module continuously monitors the duration of low vacuum conditions and triggers the SPI mitigation module to generate mitigation signals in advance, allowing the control module to adjust fueling, spark timing, and boost levels before combustible matter combusts and causes damage.
Solution Approach 2:
The system implements feedback through continuous monitoring of vacuum levels and timer tracking. The control module receives real-time feedback from the timer module about the duration of low vacuum conditions and adjusts engine parameters accordingly, creating a closed-loop control system that adapts to changing operating conditions to prevent SPI events.
2Reliability
If the timer module continuously monitors low vacuum conditions, then SPI events can be detected early, but this increases system complexity
Solution Approach 1:
The timer module is designed with multi-functionality, serving both as a simple time-tracking device for monitoring low vacuum duration and as an integrated component of the broader control system. This universal design allows the same hardware to perform multiple functions without proportionally increasing system complexity.
Solution Approach 2:
The patent merges the timer module, SPI mitigation module, and boost control module into an integrated control system. Rather than having separate independent systems, these modules work together seamlessly, with the timer module feeding data to the SPI mitigation module, which then triggers appropriate control actions, reducing overall system complexity through consolidation.
Data Source
AI summary
An engine control system for a vehicle includes a timer module, a stochastic pre-ignition (SPI) mitigation module, and a boost control module. The timer module tracks a period of operation of an engine where vacuum within an intake manifold is less than a first predetermined vacuum. The SPI mitigation module generates an SPI signal when the period is greater than a predetermined period and the vacuum is less than a second predetermined vacuum. The second predetermined vacuum is less than the first predetermined vacuum. The boost control module reduces output of a turbocharger in response to the generation of the SPI signal.