Engine Circuit Mode Switching for Stable Combustion Control
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Solution Overview
Problem
Existing vehicle systems require numerous adaptation steps and time to determine if combustion conditions are met for stable fuel combustion when switching to a circuit mode, leading to potential instability and inefficiency.
Innovation Solution
A vehicle system that includes an engine control unit to control the engine in circuit mode based on a portable terminal's determination of the vehicle's position in a circuit, rejecting mode switching if partial combustion conditions are not satisfied, and turning off the circuit mode when conditions are not met during travel or upon stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the limiter is released when the vehicle is positioned in a circuit, then the traveling performance of the vehicle is improved, but the fuel combustion stability cannot be guaranteed
Solution Approach 1:
The system performs preliminary determination of combustion conditions (intake air temperature, fuel injection amount, etc.) before allowing the circuit mode to be activated. The engine control unit checks whether combustion conditions satisfy predetermined criteria before releasing the limiter, ensuring stable fuel combustion is guaranteed before improving traveling performance.
2Reliability
If all combustion conditions are individually determined, then the fuel combustion stability is ensured, but the number of adaptation steps increases
Solution Approach 1:
The system merges multiple individual combustion condition determinations into a single integrated assessment. Instead of separately evaluating each combustion parameter, the engine control unit performs a combined determination of whether all combustion conditions collectively satisfy predetermined criteria, thereby reducing the number of adaptation steps while ensuring fuel combustion stability.
3Loss of time
If the circuit mode is activated without checking combustion conditions, then the response time is reduced, but the fuel combustion stability cannot be guaranteed
Solution Approach 1:
The system performs preliminary determination of combustion conditions before circuit mode activation. By checking whether combustion conditions satisfy predetermined criteria in advance, the system ensures fuel combustion stability is guaranteed before the mode switch, while minimizing adaptation time through efficient evaluation of the predetermined criteria.
Data Source
AI summary
A vehicle, with an engine, includes an engine control unit 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, wherein the engine control unit is configured to reject switching to the circuit mode regardless of the request, when the engine control unit determines that a part of combustion conditions among all combustion conditions for stable combustion of fuel supplied to the engine in the circuit mode is not satisfied.