Engine Torque Control for Predicted Generator Load Increases
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Solution Overview
Problem
Existing internal combustion engine control systems face challenges in preventing engine stalling due to sudden speed decreases, particularly when the load on generators increases, leading to inefficient torque management and potential combustion efficiency losses.
Innovation Solution
An internal combustion engine control apparatus that adjusts intake air amount and ignition timing based on predicted generator load increases, using a predictor to anticipate load changes and correct intake air and ignition timing to maintain output torque and prevent stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake air amount is increased to avoid engine stalling when speed decreases, then the engine can maintain operation, but combustion efficiency deteriorates and torque control precision is reduced
Solution Approach 1:
The control apparatus predicts generator load increases in advance and proactively adjusts intake air amount and ignition timing before the actual load change occurs. This preliminary action prevents engine stalling by preparing the engine system ahead of time, while allowing for more precise torque control compared to reactive corrections.
Solution Approach 2:
The control apparatus continuously monitors engine speed, generator load, and torque output, using this feedback to dynamically adjust intake air amount and ignition timing. The system corrects deviations from target torque based on actual performance data, optimizing combustion efficiency while preventing stalling.
2Stability of the object's composition
If the intake air amount is increased to maintain output torque during generator load increase, then torque stability is improved, but engine speed control precision deteriorates
Solution Approach 1:
The control apparatus dynamically adjusts both intake air amount and ignition timing in coordination with each other, rather than using a fixed correction pattern. This dynamic control allows the system to maintain output torque stability while preserving engine speed control precision by adapting to real-time operating conditions.
Solution Approach 2:
The control apparatus changes multiple parameters (intake air amount and ignition timing) simultaneously and coordinates their adjustments to achieve the desired balance between torque stability and speed control. By adjusting ignition timing alongside intake air corrections, the system maintains precision in both outputs.
3Manufacturing precision
If ignition timing is retarded to correct excessive torque during generator load increase, then torque precision is improved, but engine speed decreases and stalling risk increases
Solution Approach 1:
The control apparatus predicts generator load increases and proactively adjusts ignition timing before excessive torque occurs. By anticipating the load change and applying corrective ignition timing adjustments in advance, the system prevents both excessive torque and subsequent stalling, maintaining engine speed stability throughout.
Solution Approach 2:
The control apparatus monitors engine speed and torque output continuously, using feedback to determine when ignition timing correction is needed and how much correction to apply. This feedback mechanism ensures that ignition timing adjustments achieve torque precision without pushing the engine toward stalling conditions.
Data Source
AI summary
An internal combustion engine control apparatus: sets a target intake air amount and a target ignition timing, based on a target torque; predicts an increase in a load of power generation by a generator that is coupled to a power transmission system and generates electric power by being driven by an output torque of an internal combustion engine; when the load of the power generation is predicted to increase, sets an amount of increase correction on the target intake air amount, based on a power generation torque for driving the generator, and sets a retardation amount of the target ignition timing, based on a difference between the target torque and the output torque of the internal combustion engine achieved by the target intake air amount after the increase correction; and returns the target ignition timing to an advance side when a speed of the internal combustion engine suddenly drops.