Engine Control System Atmospheric Pressure Adaptation
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Solution Overview
Problem
Conventional internal combustion engine control systems take time to adapt to changes in atmospheric pressure, leading to degraded fuel economy as they repeatedly search for an optimum operating point, making it impossible to minimize fuel consumption efficiently during such changes.
Innovation Solution
A control system that includes atmospheric pressure detection, interpolation of operating point data to calculate optimum fuel economy operating points, and engine control using demanded torque and speed parameters to minimize fuel consumption, allowing for quick adaptation to changing atmospheric conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the control system repeatedly executes the operating point search process to determine the optimum operating point, then the fuel consumption ratio can be minimized under current conditions, but the system takes too long to adapt when atmospheric pressure changes
Solution Approach 1:
The patent stores multiple sets of operating point data corresponding to different atmospheric pressure conditions in advance. When atmospheric pressure changes, the system quickly retrieves and switches to the pre-prepared operating point data matching the current pressure condition, eliminating the need for time-consuming repeated searches and enabling immediate adaptation while maintaining optimal fuel consumption.
Solution Approach 2:
The patent changes the approach from iterative optimization to direct parameter switching. By pre-storing operating point data for various atmospheric pressure levels and switching between them based on detected pressure conditions, the system achieves both rapid adaptation and continuous fuel optimization without repeated execution cycles.
2Adaptability or versatility
If the control system uses a single set of operating point data, then the device complexity is reduced, but the system cannot adapt to different atmospheric pressure conditions
Solution Approach 1:
The patent segments the operating point data into multiple sets, each corresponding to a specific atmospheric pressure condition. This segmentation allows the system to store organized, condition-specific data that can be quickly retrieved and applied, achieving high adaptability to different environmental conditions while maintaining manageable data structure and system complexity.
Data Source
AI summary
A control system for an internal combustion engine, which is capable of quickly and properly ensuring excellent fuel economy of the engine even when atmospheric pressure has changed. The control system includes an ECU. The ECU performs weighted average calculation on lowland map values and highland map values, based on atmospheric pressure, to thereby calculate map values of a demanded torque that minimize a fuel consumption ratio of the engine in the atmospheric pressure, and calculates engine demanded output. The ECU calculates demanded torque and demanded engine speed using the map values and the engine demanded output, respectively. The ECU controls the engine using the demanded torque.