Engine Generator Start Control via Dynamic Motor Current Adjustment
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Solution Overview
Problem
Existing engine generators face difficulties in starting the engine when the piston is at a position before the compression top dead center due to the need for high torque, which is challenging with the conventional starter motor setup.
Innovation Solution
A start control apparatus for an engine generator that includes a battery, a booster to increase the battery output, an engine starter to supply the boosted output to the winding as motor current, a piston position determiner to assess the piston's position, and a motor current determiner to increment the current when the piston is before the top dead center, allowing the engine to start reliably without a separate starter motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine generator uses a starter motor to start the engine, then the engine can be started, but the structure becomes complex
Solution Approach 1:
The patent applies multi-functionality by enabling the alternator to serve dual purposes: generating electricity during normal operation and functioning as a starter motor during engine starting. The control unit switches the alternator to motor mode by controlling the current flow through the windings, eliminating the need for a separate starter motor and reducing structural complexity while maintaining reliable engine starting
Solution Approach 2:
The patent merges the function of the starter motor with the alternator into a single integrated component. By using the same electromagnetic structure (alternator windings) for both generation and motor functions, the system consolidates multiple functions into one device, thereby simplifying the overall structure while ensuring reliable engine starting
2Device complexity
If the engine generator supplies power to the winding to use it as a motor for starting, then the structure is simplified, but it may be difficult to start the engine when the piston is at a position before compression TDC
Solution Approach 1:
The patent applies dynamics by implementing dynamic current control based on real-time piston position detection. The control unit continuously monitors piston position and dynamically adjusts the motor current magnitude and timing to the alternator windings, ensuring optimal torque delivery regardless of the piston's position, thereby enabling reliable engine starting while maintaining a simplified structure
Solution Approach 2:
The patent applies preliminary action by detecting the piston position in advance and pre-calculating the required motor current parameters before initiating the starting sequence. This allows the control unit to prepare the optimal current profile that accounts for the compression resistance at the specific piston position, ensuring reliable engine starting with the simplified alternator-motor configuration
3Reliability
If the motor current is increased when the piston is before top dead center, then the engine can start reliably, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by implementing dynamic, real-time adjustment of motor current based on piston position feedback. The control unit increases current only during the specific crank angle range where compression resistance is highest (when piston is before TDC), and reduces or stops current when the piston passes TDC, thereby achieving reliable starting while minimizing overall energy consumption through precise temporal control
Solution Approach 2:
The patent applies parameter changes by dynamically modifying the motor current parameters (magnitude and timing) according to the detected piston position. The control unit adjusts the current waveform to match the varying compression resistance throughout the engine cycle, applying higher current only when necessary to overcome compression forces, thus optimizing the balance between starting reliability and energy efficiency
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
Enables reliable engine starting by providing sufficient torque to overcome the compression top dead center challenge, simplifying the structure and minimizing energy consumption by adjusting the motor current based on the piston position.
Implementation Method 1
generate power based on outputs from windings wound around an alternator which is driven by an engine
Implementation Method 2
supply the boosted battery output to the winding as a motor current to start the engine
Data Source
AI summary
In a start control apparatus for an engine generator having a booster adapted to boost an output of a battery, there is provided an engine starter adapted to supply the boosted battery output to an output winding as a motor current to start the engine, and it is configured to determine whether a position of the piston is before a top dead center (TDC) when the motor current is to be supplied to the winding, and the motor current is increased by an increment when the piston position of the engine is determined to be before the TDC.