Engine Torque Maximization via Cylinder Pressure Feedback Control
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Solution Overview
Problem
Internal combustion engines, particularly diesel engines, underutilize performance potential due to reliability constraints that result in excessive margins on maximum pressure cycles, leading to suboptimal torque production.
Innovation Solution
A method that utilizes real-time cylinder pressure measurements to regulate injection advance and fuel flow, incorporating a regulator to generate a signal for injection advance correction, thereby optimizing maximum pressure and torque while maintaining reliability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If margins are imposed on maximum pressure in cylinders to meet reliability constraints, then reliability is improved, but torque production deteriorates
Solution Approach 1:
The patent implements a feedback control system that continuously measures actual maximum pressure in the cylinders and compares it to a reference value. Based on this feedback, the system automatically adjusts injection timing to optimize torque production while maintaining pressure within safe limits, thereby resolving the contradiction between reliability margins and performance potential.
Solution Approach 2:
The system dynamically changes the injection timing parameter based on measured pressure variations. By adjusting this critical parameter in real-time according to actual engine conditions, the system maximizes torque production without exceeding reliability constraints, eliminating the need for fixed conservative margins.
2Reliability
If conservative margins are applied to maximum pressure cycles, then reliability constraints are met, but performance potential is underutilized
Solution Approach 1:
The system uses the engine's own pressure measurements to automatically regulate injection timing. By relying on real-time data from the engine itself rather than external conservative estimates, the system optimizes performance while ensuring reliability constraints are met, allowing each engine to utilize its full performance potential.
Solution Approach 2:
Through continuous measurement of actual maximum pressure and comparison with reference values, the feedback system enables the engine to operate at optimal performance levels without exceeding reliability constraints, eliminating the performance loss caused by conservative fixed margins.
3Power
If real-time pressure measurement and regulation is implemented, then torque production is maximized, but system complexity increases
Solution Approach 1:
The patent utilizes existing engine control components and measurement systems to implement pressure-based injection timing regulation. By making existing systems multi-functional (using pressure data both for diagnosis and active control), the patent maximizes torque production without proportionally increasing system complexity.
Data Source
AI summary
The invention relates to a method for maximizing a torque supplied by an engine that is subject to reliability constraints and operating-cycle variations, using a controller (2) suitable for producing a signal representative of an injection advance correction on the basis of a signal (P cylmax ) representative of measurements of an engine parameter and a signal (setpoint_P cylmax ) representative of an engine parameter setpoint. The method in particular comprises the steps of: - defining a maximum cylinder pressure setpoint (setpoint_P cylmax ); - defining an operating range for the controller (2); - defining a stability criterion for the measurement of a maximum cylinder pressure (P cylmax ) ; - controlling the injection advance; and - correcting the injection advance.