Hybrid Working Machine Capacitor Deterioration Control
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Solution Overview
Problem
The deterioration of capacitors in hybrid working machines due to long-term use, overcharging, excessive discharging, and heat generation leads to reduced lifespan, and existing technologies fail to effectively manage this deterioration for optimal performance.
Innovation Solution
A hybrid working machine that uses a capacitor voltmeter and ammeter to measure the deterioration state, implementing output power control within appropriate ranges to suppress capacitor deterioration by determining the operation state through internal resistance measurement and adjusting the power distribution between the engine, motor generator, and swing motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the capacitor continues normal operation without output control, then the working machine maintains full performance, but the capacitor deterioration is expedited and lifespan is shortened
Solution Approach 1:
The patent implements dynamic output control of the capacitor based on real-time monitoring of its deterioration state. The control system adjusts the capacitor's output power dynamically - using full power when the capacitor is healthy, and reducing power output as deterioration progresses. This dynamic adjustment resolves the contradiction by allowing full productivity when possible while protecting the capacitor's lifespan through adaptive power management.
Solution Approach 2:
The patent employs a feedback mechanism where the deterioration state of the capacitor is continuously monitored and fed back to the control system. Based on this feedback information, the control system adjusts the capacitor's output power accordingly. This closed-loop control resolves the contradiction by enabling the system to maintain high productivity when the capacitor is healthy while automatically reducing stress on the capacitor as it deteriorates, thereby extending its operational life.
2Device complexity
If the capacitor operates without monitoring its deterioration state, then the system remains simple, but the capacitor may be overcharged or excessively discharged leading to accelerated deterioration
Solution Approach 1:
The patent implements a self-service monitoring system where the capacitor's own electrical parameters (voltage, current, power) are measured and used to assess its deterioration state. The system uses the capacitor's inherent electrical characteristics to monitor its health without requiring external complex diagnostic equipment. This approach improves reliability through continuous monitoring while keeping the system relatively simple by utilizing the capacitor's own operational data.
Solution Approach 2:
The patent monitors changes in the capacitor's electrical parameters (voltage, current, power consumption) to detect deterioration. By tracking parameter changes over time, the system can assess the capacitor's health state and adjust operation accordingly. This method improves reliability through parameter-based monitoring while maintaining system simplicity by using standard electrical measurements rather than complex diagnostic systems.
3Productivity
If the capacitor output power is not controlled within appropriate ranges, then the operation continues without interruption, but the deterioration due to overcharging, excessive discharging, and heat generation accelerates
Solution Approach 1:
The patent implements dynamic power range control based on the capacitor's real-time deterioration state. When the capacitor is healthy, it operates within full power ranges enabling continuous productivity. As deterioration progresses, the system dynamically adjusts the allowable power range to prevent overcharging, excessive discharging, and overheating. This dynamic range adjustment resolves the contradiction by maintaining continuous operation when safe while preventing harmful deterioration factors through adaptive power management.
Solution Approach 2:
The patent applies beforehand cushioning by establishing predetermined power output ranges that prevent the capacitor from entering dangerous operating conditions. The control system proactively limits the capacitor's power output to prevent overcharging, excessive discharging, and heat generation before these conditions cause accelerated deterioration. This preventive approach maintains productivity within safe boundaries while cushioning against harmful factors that would otherwise accelerate capacitor failure.
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 extends the lifespan of the capacitor by maintaining optimal input/output power ranges, reducing the rate of deterioration and ensuring stable operation of the hybrid working machine.
Implementation Method 1
a capacitor or the like... the converted electric energy is accumulated in a capacitor or the like
Implementation Method 2
surplus kinetic energy that is generated from the motor is converted into electric energy
Data Source
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AI summary
A motor generator operates as a generator and a motor. A converter switches a discharge state where power is supplied from a capacitor to the motor generator and a charge state where the capacitor is charged by the power generated from the motor generator. Electric power that is output from the capacitor in the discharge state and electric power that is input to the capacitor in the charge state are controlled. A capacitor voltmeter measures a terminal-terminal voltage of the capacitor. A capacitor ammeter measures charge/discharge current of the capacitor. The measurement result is input from the capacitor voltmeter and the capacitor ammeter to a controller. The controller controls the converter based on the measurement result.