Integrated Starter-Generator Piston Positioning
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Solution Overview
Problem
Traditional starter systems for lightweight utility vehicles, such as golf cars, are complex, require frequent maintenance, and contribute to engine noise due to their mechanical design.
Innovation Solution
An integrated starter-generator system where a starter motor is embedded within the internal combustion engine, utilizing a Hall Effect sensor and control module to manage engine startup and shutdown, positioning the piston between 15° and 25° after bottom-dead-center, and functioning as both a starter and generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional mechanical starter system with drive belt and pulleys is used, then the engine can be started, but the system complexity increases and maintenance frequency increases
Solution Approach 1:
The starter motor is integrated directly into the engine housing, merging two previously separate systems (starter motor and engine) into a single unified structure. This eliminates the need for drive belts, pulleys, and associated mechanical coupling components, thereby reducing system complexity while maintaining starting functionality
Solution Approach 2:
The integrated starter motor serves multiple functions: it acts as both a starting motor and a generator, and its housing serves as part of the engine housing structure. This multi-functionality reduces the overall number of components needed in the system
2Reliability
If a traditional mechanical starter system with drive belt and pulleys is used, then the engine can be started, but maintenance frequency increases
Solution Approach 1:
By integrating the starter motor directly into the engine housing, the patent eliminates separate mechanical coupling components (drive belts, pulleys) that have finite service lives and require periodic replacement. The unified structure reduces the number of wear-prone parts, thereby extending the overall service life and reducing maintenance frequency
3Ease of operation
If a traditional mechanical starter system with drive belt and pulleys is used, then the engine can be started, but engine noise increases
Solution Approach 1:
The patent removes the noisy mechanical coupling components (drive belt, pulleys) from the starting system. By eliminating these intermediate mechanical transmission elements, the system reduces noise generation and transmission, while the integrated starter motor provides a quieter starting operation
4Device complexity
If an integrated starter motor is used, then system complexity is reduced, but manufacturing complexity increases
Solution Approach 1:
The integrated starter motor housing is designed to be formed as an integral part of the engine housing, combining what would traditionally be separate manufacturing processes into a unified structure. This can be achieved through integrated molding or forging processes, which while more complex per unit, eliminate the need for separate assembly operations and fasteners
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
Simplifies the starter system, reduces maintenance needs, and minimizes noise while providing efficient power delivery to the driveline for motive force.
Implementation Method 1
a Hall Effect sensor mounted to the combustion engine portion of the housing within the starter motor portion shroud
Data Source
AI summary
A prime mover for a lightweight vehicle comprising an internal combustion engine, a starter motor integrally integrated with the internal combustion engine, and a housing for the prime mover. The prime mover additionally comprises a Hall Effect sensor and an prime mover control module structured and operable to communicate with the Hall Effect sensor, determine when operation of the internal combustion engine should cease, and upon the determination that operation of the internal combustion engine should cease, utilize the communication from the Hall Effect sensor to stop the internal combustion engine such that a piston of the internal combustion engine is positioned at between 15° and 25° after bottom-dead-center.