Hydraulic Generator Speed Control Using Generator Feedback
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Solution Overview
Problem
In hydraulically powered power systems, the characteristics of input power, such as engine RPM, are not directly tied to and/or linearly correlated with motor power characteristics due to intervening conversions, leading to unwanted variances in motor power generation.
Innovation Solution
Measuring operating characteristics of a generator and comparing them to target characteristics to control engine or motor speed to maintain equivalence, using control circuitry to adjust engine or motor speed to align with target operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine speed is directly controlled to match generator target speed, then generator operating characteristics can be maintained, but unwanted variances occur due to non-linear conversion through hydraulic components
Solution Approach 1:
The control system continuously monitors actual generator operating characteristics (speed, voltage, frequency) and compares them to target values. Based on the deviation detected, the system adjusts engine or motor speed dynamically to maintain equivalence, creating a closed-loop feedback control that compensates for hydraulic conversion variances
Solution Approach 2:
The system changes the operating parameters (speed) of the engine or motor based on detected deviations in generator characteristics. By dynamically adjusting these input parameters rather than maintaining a fixed relationship, the system compensates for the non-linear hydraulic conversion and maintains stable generator output
2Adaptability or versatility
If hydraulic power transmission is used to provide flexible power delivery, then system versatility is improved, but non-linear conversion causes unwanted variances in power characteristics
Solution Approach 1:
The control system uses continuous feedback from generators to detect variances in power characteristics caused by hydraulic conversion. By monitoring actual versus target operating characteristics and dynamically adjusting engine or motor speed, the system maintains power consistency despite the flexible hydraulic transmission path
Solution Approach 2:
The control system acts as an intermediary between the hydraulic power transmission and the generators. It detects the non-linear effects of hydraulic conversion and compensates by adjusting engine or motor speed, mediating between the flexible hydraulic system and the requirement for consistent power characteristics
Data Source
AI summary
A hydraulically powered power system comprises: a hydraulic motor configured to convert an input hydraulic flow to motor power; a generator drivingly coupled to the hydraulic motor and configured to convert the motor power to an electrical output; a first sensor configured to measure a first operating characteristic of the generator and to generate a first feedback signal comprising a first measured operating characteristic associated with the first operating characteristic; and control circuitry configured to: monitor the first feedback signal to determine a first operating characteristic difference based on a first target operating characteristic and the first measured operating characteristic, and upon determining the first operating characteristic difference, output a control signal to control an engine to modify an engine speed of the engine based on the first operating characteristic difference.