Engine Control Thresholds for Circuit Mode Over-Rev Detection
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Solution Overview
Problem
Existing vehicle engine control systems struggle to accurately determine the occurrence of over-revving, especially when switching between normal and circuit modes, which can lead to inconsistent durability assessment of engine components.
Innovation Solution
A vehicle engine control system that includes an engine control unit to manage circuit mode based on a portable terminal's determination of the vehicle's location, adjusting maximum rotation speed thresholds and recording switching information to uniquely determine over-revving occurrence, regardless of mode changes, and using a display control unit to indicate mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the maximum engine speed is increased when switching to circuit mode, then the traveling performance of the vehicle is improved, but it becomes difficult to determine the occurrence of over-revving
Solution Approach 1:
The patent applies preliminary action by establishing a threshold value for over-revving determination before the circuit mode is activated. The threshold is set based on the normal maximum engine speed, and this threshold remains fixed even when the maximum engine speed is increased in circuit mode. This allows the system to maintain consistent over-revving detection criteria regardless of mode changes.
Solution Approach 2:
The patent segments the engine operation into different modes (normal mode and circuit mode) with distinct maximum speed characteristics, but uses a unified threshold-based determination method for over-revving detection. This segmentation approach allows the system to handle different operating conditions while maintaining consistent safety monitoring through the fixed threshold value.
2Productivity
If the threshold for determining over-revving is changed when switching to circuit mode, then the maximum engine speed can be increased, but it becomes difficult to find a decrease in durability of components
Solution Approach 1:
The patent establishes a fixed threshold value for over-revving determination in advance, based on the normal maximum engine speed. This threshold serves as a reference for assessing component durability and remains unchanged even when the maximum engine speed is increased in circuit mode. By maintaining this fixed threshold, the system can consistently monitor and assess component stress and durability across different operating modes.
3Speed
If the maximum engine speed is increased in circuit mode, then the occurrence of over-revving is suppressed within the new range, but the stress on components from previous design assumptions increases
Solution Approach 1:
The patent uses a fixed threshold value established before circuit mode activation to monitor and detect over-revving conditions. This threshold, based on normal operating conditions, serves as a safety reference that alerts the system when engine speed exceeds design assumptions, even in circuit mode where higher speeds are permitted. This allows the system to accommodate higher performance demands while maintaining awareness of component stress limits.
Data Source
AI summary
A vehicle, with an engine, includes an engine control unit. The engine control unit is configured to control the engine in a circuit mode in which a traveling performance of the vehicle is improved, on a basis of a request transmitted from a portable terminal, when the portable terminal operated by a user of the vehicle determines that a current position of the vehicle equipped with the engine is in a circuit.