Fuel Injection Controller Cylinder Pressure Feedback
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Solution Overview
Problem
Existing fuel injection controllers face challenges in accurately controlling cylinder pressure during multiple injection methods, particularly during fuel combustion, due to unpredictable factors affecting cylinder conditions, leading to inaccuracies in injection mode control.
Innovation Solution
A fuel injection controller system that uses cylinder pressure sensors to directly measure cylinder pressure during fuel combustion, allowing for precise control of the injection mode based on actual measurement values, rather than estimation, and selectively uses estimation for injections with higher accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cylinder pressure is estimated using an adaptation map based on injection timing, then the controller can control fuel injection quantity and period, but the estimation becomes inaccurate when unpredictable factors affect cylinder conditions during fuel combustion
Solution Approach 1:
The patent applies feedback by using a cylinder pressure sensor to directly measure the actual cylinder pressure during fuel combustion and feed this information back to the controller. The controller then adjusts the fuel injection quantity and timing based on this real-time feedback, creating a closed-loop control system that adapts to unpredictable changes in cylinder conditions, thereby resolving the contradiction between estimation accuracy and adaptability to varying conditions
2Measurement precision
If a cylinder pressure sensor is installed in each cylinder to directly measure pressure, then injection mode control accuracy is improved, but device complexity and sensor usage increase
Solution Approach 1:
The patent applies segmentation by dividing the control strategy into two parts: using a cylinder pressure sensor in a specific cylinder (the object cylinder receiving additional fuel injection) to measure pressure during combustion, while using estimation methods for other cylinders or different injection types. This selective approach reduces the need for sensors in every cylinder, thereby reducing device complexity while maintaining measurement precision where it is most needed
3Measurement precision
If real-time cylinder pressure measurement is performed during fuel combustion, then injection mode control accuracy is improved, but computation load increases
Solution Approach 1:
The patent applies partial action by performing real-time cylinder pressure measurement only for the specific object cylinder that receives additional fuel injection during combustion, rather than measuring pressure in all cylinders continuously. This selective measurement approach reduces the overall computation load while maintaining the necessary measurement precision for accurate injection mode control in the critical cylinder
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 enables high-accuracy control of the injection mode, including during fuel combustion, while minimizing computation load and sensor usage, effectively reducing emissions and improving combustion efficiency.
Implementation Method 1
at least one cylinder pressure sensor is provided to at least one cylinder for outputting a sensing signal corresponding to pressure in the same cylinder
Data Source
AI summary
A fuel injection controller (engine control ECU) controls a fuel injection mode of an engine having cylinder pressure sensors in all of four cylinders for measuring pressures in the cylinders. The controller measures a pressure (cylinder pressure) in the cylinder as an object cylinder (each of the four cylinders) based on an output of the corresponding cylinder pressure sensor when the fuel combustion is in progress in the object cylinder and the fuel to be used in the combustion is additionally injected and supplied to the same cylinder (e.g., when an after-injection is performed). The controller variably controls a command signal (i.e., pulse width) sent to the injector in relation to the target injection (the after-injection) on the basis of the measured cylinder pressure.