Engine Startup Bypass Circuit Voltage Control
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Solution Overview
Problem
Conventional engine starting devices face increased design complexity due to the need to manage battery voltage fluctuations and counter-electromotive force during engine startup, requiring consideration of fluctuating engine parameters to maintain minimum voltage above an allowable value for electrical equipment.
Innovation Solution
The bypass circuit is opened at engine startup and closed when the battery voltage differential changes from greater than zero to zero, eliminating the need to account for counter-electromotive force and fluctuating parameters, thereby simplifying the design by ensuring the battery voltage is at its minimum before startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bypass circuit is closed after engine startup commences (as in prior art), then the battery voltage can be maintained during cranking, but the design complexity increases due to the need to account for counter-electromotive force and fluctuating engine parameters
Solution Approach 1:
The bypass circuit is opened before engine startup commences (at the initial stage of starter motor energization) rather than after startup. This preliminary action ensures battery voltage is maintained during the critical initial phase without requiring complex compensation for counter-electromotive force and fluctuating parameters that occur during engine operation
Solution Approach 2:
The invention inverts the conventional timing of bypass circuit operation. Instead of closing the bypass circuit after engine startup (as in prior art), the invention opens the bypass circuit at the initial stage of starter motor energization, reversing the conventional approach to achieve voltage stability with simpler design
2Reliability
If the bypass circuit timing is based on engine position (first upper dead center), then the engine can be started reliably, but the design must account for fluctuating parameters such as rotation fluctuation and driving load
Solution Approach 1:
The invention extracts the bypass circuit control from dependence on engine position parameters (crank angle, rotation speed, load). By opening the bypass circuit at the initial stage of starter motor energization based on voltage differential detection rather than engine position, the design eliminates the need to monitor and compensate for fluctuating engine parameters
Solution Approach 2:
The invention uses battery voltage differential as an intermediary parameter to control bypass circuit timing. Instead of directly monitoring engine position and parameters (crank angle, rotation speed, load), the system uses voltage differential as a mediator that indirectly reflects the appropriate timing for bypass circuit operation, simplifying the control logic
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 design complexity by maintaining battery voltage above the minimum required level without needing to consider engine parameters, ensuring stable operation of electrical equipment during engine startup.
Implementation Method 1
the bypass circuit is closed when a differential value of the battery voltage changes from a value greater than zero to zero after commencement of engine startup
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A bypass circuit (24a) is opened immediately after engine startup is commenced until the engine exceeds the first lower dead center, and closed after the lower dead center is exceeded.