Generator Set Fuel Injection Regulation via Torque Detection
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Solution Overview
Problem
Generator sets with turbocharged engines face performance degradation due to inability to correctly start turbocharging, leading to engine speed drops and insufficient exhaust gas flow, especially during load variations, which can cause instability and inefficiency.
Innovation Solution
A method of regulating fuel injection in a thermal engine of a generator, involving detection of torque and kinetic energy variations through electrical measurements, allowing for immediate correction by modifying the speed setpoint of the speed regulator and voltage regulator, thereby managing load changes and facilitating turbocharged engine operation without altering existing speed regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine speed drops during load variation, then the voltage regulator increases excitation current to maintain voltage, but the engine speed falls below the threshold needed for turbocharger operation
Solution Approach 1:
The invention applies preliminary action by detecting torque and kinetic energy variations before the engine speed drops below the turbocharger threshold. The control system anticipates the speed drop and modifies the speed setpoint in advance, preventing the engine speed from falling into the dangerous zone where turbocharger operation would be compromised, while still allowing the voltage regulator to maintain voltage stability.
Solution Approach 2:
The invention introduces an intermediary control mechanism that mediates between the voltage regulator and the speed regulator. This intermediary system processes torque and kinetic energy information to determine when and how to modify the speed setpoint, coordinating the actions of both regulators to achieve both voltage stability and maintain engine speed above the turbocharger threshold.
2Speed
If the speed regulator increases fuel injection to maintain speed, then the engine speed is maintained, but the turbocharger cannot be launched due to insufficient exhaust gas flow
Solution Approach 1:
The invention implements feedback by continuously monitoring torque and kinetic energy variations and using this information to adjust the speed setpoint. This feedback mechanism allows the system to detect when a load variation is occurring and respond by modifying the speed setpoint before the exhaust gas flow becomes insufficient for turbocharger operation, thereby maintaining both engine speed and turbocharger reliability.
3Reliability
If the voltage regulator acts quickly to correct voltage drop, then voltage stability is maintained, but the engine speed drops too much for correct turbocharging startup
Solution Approach 1:
The invention applies preliminary anti-action by counteracting the potential negative effect of voltage regulator action before it occurs. By detecting torque and kinetic energy variations in advance, the system modifies the speed setpoint to compensate for the upcoming voltage correction, preventing the engine speed from dropping too much while still allowing the voltage regulator to maintain voltage stability.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention concerns a method for regulating the injection of fuel into a heat engine (2) of a generator set (1) comprising an alternator (3) driven by the heat engine, the alternator comprising a voltage regulator (6), the heat engine comprising a speed regulator (4) having an inlet that can receive an external speed setpoint, the method comprising the following steps: detecting a variation in torque and kinetic energy from electrical measurements on the alternator (3), carrying out an action on the input of the setpoint of the voltage regulator (6) and/or the speed regulator (4), on the basis of the magnitude of the variation in torque relative to the kinetic energy level.