Engine Control Method for Inertial Travel Noise Reduction
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Solution Overview
Problem
The rotation of engines does not immediately stop after the start of inertial traveling, leading to discomfort due to noise generated by engine cranking during inertial rotation when a condition to stop inertial traveling is satisfied.
Innovation Solution
An engine control method that determines the driver's intention for acceleration, stops fuel supply to the engine when no intention for acceleration is detected, prohibits engine restart until the rotational speed drops below a predetermined threshold, and restarts the engine after it reaches this threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine is restarted immediately when a condition to stop inertial traveling is satisfied, then the response to driver acceleration intention is improved, but noise is generated during inertial rotation causing driver discomfort
Solution Approach 1:
The control device determines driver acceleration intention in advance during inertial traveling and prepares for engine restart, but delays actual restart execution until engine rotational speed drops below the threshold. This preliminary determination combined with conditional delayed execution resolves the contradiction by preparing response while avoiding noise.
2Object-affected harmful factors
If the engine restart is prohibited until rotational speed drops below threshold, then noise is prevented, but response timing to driver acceleration intention is delayed
Solution Approach 1:
The control device dynamically adjusts the engine restart timing based on real-time rotational speed conditions. When acceleration intention is detected, the system monitors rotational speed and executes restart only when speed drops below threshold, creating a dynamic response that adapts to engine state rather than using fixed timing.
3Use of energy by moving object
If fuel supply is stopped during inertial traveling, then fuel efficiency is improved, but engine restart must be managed carefully to avoid noise
Solution Approach 1:
The control device changes the fuel supply parameter from normal supply to stopped supply during inertial traveling, improving fuel efficiency. Simultaneously, it controls the restart parameter by monitoring rotational speed and only permitting restart when speed drops below threshold, thus avoiding noise while maintaining fuel efficiency benefits.
Data Source
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AI summary
An engine control method, including: determining an intention of a driver for acceleration during vehicle (1) traveling; stopping fuel supply to an engine (2) when it is determined that the driver does not have the intention for acceleration; permitting restart of the engine (2) when it is determined that the driver has the intention for acceleration after stopping the fuel supply to the engine (2); prohibiting the restart of the engine (2) until an engine rotational speed (Re) drops to or below a predetermined rotational speed threshold (Tr), even when the restart of the engine (2) is permitted; and restarting the engine (2) after the engine rotational speed (Re) drops to or below the predetermined rotational speed threshold (Tr) .