Fuel Injection Controller Cylinder Pressure Feedback
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Solution Overview
Problem
Existing fuel injection controllers for multi-cylinder internal combustion engines struggle to suitably control injection timings across all cylinders, particularly when the state of exhaust gas recirculation changes, leading to potential misfires and impaired exhaust characteristics.
Innovation Solution
A fuel injection controller that uses a part-of-cylinders ignition timing control mechanism to compute and feedback-control ignition timings based on detection results from a cylinder pressure sensor, while adjusting other cylinders' injection timings to match the torque produced by the sensed cylinder, ensuring all cylinders operate with corresponding ignition timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cylinder pressure sensor is mounted only on the cylinder with the largest quantity of EGR, then the device complexity is reduced, but the control precision of ignition timing for all cylinders deteriorates
Solution Approach 1:
The control system is segmented into a reference cylinder (with pressure sensor) and other cylinders (without pressure sensor). The reference cylinder's pressure data is used to compute ignition timing for all cylinders through transfer learning, avoiding the need for sensors in every cylinder while maintaining control precision.
Solution Approach 2:
The ignition timing control characteristics of the reference cylinder are copied and applied to other cylinders. By computing a transfer learning value based on the reference cylinder's pressure detection results, the system replicates the control strategy across all cylinders without direct measurement in each one.
2Device complexity
If ignition timings of all cylinders are controlled based on pressure detection from one cylinder, then the device complexity is reduced, but the reliability of combustion stability deteriorates
Solution Approach 1:
The system uses feedback from the reference cylinder's pressure sensor to continuously monitor and adjust ignition timing. The detected pressure changes in the reference cylinder provide feedback that is transferred to control other cylinders, ensuring combustion stability through continuous monitoring and adjustment.
Solution Approach 2:
The system changes the control parameter approach by using pressure detection from one cylinder to infer combustion state in all cylinders. Through transfer learning calculations, the system adapts the ignition timing parameters for each cylinder based on the reference cylinder's pressure data, maintaining reliability without universal sensing.
3Ease of operation
If the same injection timing control is applied to all cylinders, then the ease of operation is improved, but the manufacturing precision of individual cylinder performance deteriorates
Solution Approach 1:
While using a unified control framework, the system applies local quality by calculating cylinder-specific ignition timing adjustments based on individual cylinder characteristics and EGR rates. The transfer learning value is computed considering each cylinder's specific parameters, allowing tailored ignition timing for each cylinder while maintaining an overall simple control architecture.
Data Source
AI summary
A fourth cylinder is mounted with a cylinder pressure sensor. The injection timing of the fourth cylinder is operated so as to feedback control the ignition timing of the fourth cylinder, which is detected by the cylinder pressure sensor, to a target ignition timing. The ignition timings of the first cylinder to the third cylinder are indirectly controlled by operating the injection timings so as to make output torques produced by combustion in the first cylinder to the third cylinder correspond to an output torque produced by combustion in the fourth cylinder.