Starter Motor Controlled Engine Restart for SSC Clutch Impact Reduction
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Solution Overview
Problem
The existing Start-Stop Coasting (SSC) technique causes unnecessary noise and vibration during engine restart, leading to deteriorated drivability and durability due to the impact generated by the rotating clutch when starting the engine after SSC is released.
Innovation Solution
A method and apparatus that utilize a starter motor to rotate the engine for a short time before clutch engagement, allowing for a controlled and reduced impact restart by determining the need for emergency startup based on accelerator opening degree and performing a specific startup process that includes starter motor operation and clutch engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is started by the clutch after SSC is released, then the engine can be restarted, but impact is generated due to the rotating clutch causing noise and vibration
Solution Approach 1:
The starter motor is operated before clutch engagement to rotate the engine in advance. This preliminary action ensures the engine is already rotating when the clutch engages, preventing impact and reducing noise and vibration during restart.
Solution Approach 2:
The starter motor acts as an intermediary device between the battery and the engine-clutch system. It provides a controlled rotation of the engine before clutch engagement, mediating the connection between the stopped engine and the transmission to avoid direct impact.
2Object-affected harmful factors
If the starter motor is operated for a long time before clutch engagement, then engine restart smoothness is improved, but fuel efficiency is reduced
Solution Approach 1:
The starter motor is operated for only a necessary short duration - just enough to rotate the engine to an appropriate speed before clutch engagement. This partial action avoids excessive starter motor operation and associated fuel consumption while still achieving smooth restart.
Solution Approach 2:
The restart process is divided into distinct periodic phases: first operating the starter motor to rotate the engine, then disengaging the starter motor, and finally engaging the clutch. This periodic sequencing optimizes the timing of each action to minimize energy waste.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the impact during clutch engagement, thereby improving the durability of vehicle parts and enhancing restart efficiency while maintaining high fuel efficiency.
Implementation Method 1
operating a starter motor to rotate a stopped engine after entry into SSC
Data Source
AI summary
A method for restart when Start-Stop Coasting (SSC) is released may include: determining whether a traveling vehicle satisfies a condition for releasing SSC after entry into SSC (S100); determining whether emergency startup of the vehicle is required (S200) when the traveling vehicle satisfies the condition for releasing SSC after entry into SSC; and performing a first startup process (S300) in which a clutch (420) is engaged along with an operation of a starter motor (430) when the emergency startup of the vehicle is required.