Engine-Driven AC Generator Load Display for Overload Prevention
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Solution Overview
Problem
Existing alternating current generators driven by engines face challenges in indicating remaining capacity accurately, as the power consumption of connected loads exceeds the rated output of the engine, leading to unstable operation and potential overload.
Innovation Solution
The alternating current generator includes a calculation processing device that calculates and displays the remaining output capacity using both apparent and active power values, allowing users to select additional loads based on the displayed remaining capacity, independent of the engine's rated output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the remaining capacity is calculated only from apparent power (kVA) based on generator rated output, then the generator's capacity utilization is optimized, but the engine may be overloaded when load power consumption exceeds engine rated output
Solution Approach 1:
The system introduces a feedback mechanism by displaying remaining capacity in both kVA (generator perspective) and kW (engine perspective). The calculation processing device continuously monitors load power consumption and compares it with both generator rated output and engine rated output, providing real-time feedback to the user through the display unit. This dual-perspective feedback enables users to make informed decisions about load connections that satisfy both generator and engine constraints.
Solution Approach 2:
The invention segments the remaining capacity indication into two distinct components: apparent power (kVA) representing generator capacity and active power (kW) representing engine capacity. By separating these two previously unified measurements, the system allows users to independently assess both generator and engine load conditions, preventing the confusion that led to engine overload while maintaining optimal generator utilization.
2Productivity
If the remaining capacity display shows only apparent power value, then the generator's rated output is fully utilized, but users cannot accurately assess the relationship with engine rated output
Solution Approach 1:
The invention adds another dimension to the remaining capacity display by introducing the kW (active power) metric alongside the traditional kVA (apparent power) metric. This dimensional expansion transforms the single-dimensional kVA display into a two-dimensional display system that simultaneously presents both generator capacity (kVA) and engine capacity (kW) information, enabling comprehensive load assessment without losing either perspective.
3Power
If additional loads are connected without considering engine rated output, then the generator can supply maximum power, but the engine operates in overload condition leading to unstable operation
Solution Approach 1:
The system performs preliminary action by calculating and displaying the remaining capacity in both kVA and kW before the user connects additional loads. This advance calculation allows users to predict whether connecting a specific load will cause engine overload, enabling preventive decision-making. The display unit presents this information proactively, so users can avoid connecting loads that would exceed engine rated output, thereby preventing unstable operation before it occurs.
Data Source
AI summary
An alternating current generator driven by an engine and capable of obtaining power from an output terminal connected to armature windings according to a plurality of different power supply specifications includes a calculation processing device configured to calculate a remaining capacity from a voltage value between terminals of the output terminal and a current value of a current flowing to the output terminal, and display the remaining capacity. The calculation processing device performs: calculating the remaining capacity as an apparent power value; calculating usage power as an active power value to calculate remaining power by subtracting the usage power from a rated output of the engine; and comparing the remaining capacity with the remaining power, and outputting a smaller value as a remaining capacity display value indicated by the active power value.