Engine Controller Corrects Heat Generation Rate Gradient Deviations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine control techniques fail to effectively correct deviations in heat generation rate gradients caused by oxygen shortages relative to fuel, leading to combustion degradation and smoke generation in diesel engines.
Innovation Solution
A controller for internal combustion engines that adjusts fuel injection pressure or amount based on deviations between actual and reference heat generation rate gradients, using an electronic control unit to correct rail pressure and main injection amount to improve fuel-oxygen mixing and suppress smoke generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the amount of fuel injected is increased to improve power output, then the power increases, but the amount of oxygen becomes insufficient relative to fuel causing combustion degradation and smoke generation
Solution Approach 1:
The controller monitors the actual heat generation rate gradient and compares it with the reference gradient. When a deviation is detected indicating oxygen shortage, the system automatically adjusts fuel injection parameters (amount, pressure, timing) to correct the combustion state, preventing smoke generation while maintaining power output
Solution Approach 2:
The system dynamically changes fuel injection parameters (injection amount, injection pressure, injection timing) based on the detected heat generation rate gradient deviation. By adjusting these parameters, the controller optimizes the fuel-oxygen ratio to prevent combustion degradation while maintaining desired power levels
2Reliability
If the fuel injection pressure is increased to improve fuel atomization and combustion efficiency, then the combustion efficiency improves, but the complexity of the fuel injection system increases
Solution Approach 1:
Instead of using a fixed high injection pressure, the system dynamically adjusts the injection pressure based on real-time combustion conditions detected through heat generation rate monitoring. The injection pressure is increased only when and where needed to correct combustion deviations, reducing overall system complexity while maintaining combustion efficiency
3Power
If the amount of fuel injected is increased to compensate for oxygen shortage, then the power output is maintained, but the combustion degradation worsens
Solution Approach 1:
When oxygen shortage is detected through heat generation rate gradient analysis, the controller adjusts multiple fuel injection parameters simultaneously (decreasing injection amount, increasing injection pressure, adjusting injection timing) rather than simply increasing fuel amount. This multi-parameter adjustment maintains power output while improving combustion quality by enhancing fuel atomization and mixing with available oxygen
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
Precisely corrects oxygen shortages relative to fuel, effectively suppressing combustion degradation and smoke generation by dynamically adjusting engine control parameters in response to heat generation rate gradient deviations.
Implementation Method 1
a fuel injection valve configured to supply fuel into a cylinder
Implementation Method 2
an actual heat generation rate is obtained from in-cylinder pressure detected by an in-cylinder pressure sensor
Implementation Method 3
correct at least one of a fuel injection pressure or an amount of fuel injected... correcting at least one of the rail pressure and the main injection amount
Implementation Method 4
combustion of a diesel engine or the like... actual heat generation rate at the time of combustion
Data Source
AI summary
A controller for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to supply fuel into a cylinder. The controller includes an electronic control unit configured to acquire an actual heat generation rate at time of combustion; and correct at least one of fuel injection pressure or amount of fuel injected when deviation amount between reference heat generation rate gradient and actual heat generation rate gradient is equal to or greater than predetermined value such that the deviation decreases. The reference heat generation rate gradient is a gradient of a predetermined reference heat generation rate at which a predetermined time elapses after a heat generation rate begins to rise. The actual heat generation rate gradient being a gradient of an actual heat generation rate acquired by the electronic control unit at which the predetermined time elapses after the heat generation rate begins to rise.