Engine Combustion Phasing Control via Cylinder Temperature
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Solution Overview
Problem
Internal combustion engines face challenges in optimizing combustion phasing to balance power request and knock-limited conditions, leading to inefficiencies in fuel consumption and potential engine damage from knock phenomena.
Innovation Solution
The system determines the operator's power request and engine operating point, calculates the motored-cylinder temperature, and adjusts engine control states to achieve a knock-limited combustion phasing point, using a controller to manage parameters like fuel injection, spark timing, and cam phasing to optimize combustion timing and reduce fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If combustion phasing is advanced to meet operator power request, then engine power output increases, but engine knock occurs causing potential damage
Solution Approach 1:
The system dynamically adjusts combustion phasing based on real-time motored-cylinder temperature measurements and operating conditions. The combustion phasing is continuously optimized to maintain power output while preventing knock by adapting to changing thermal states of the engine cylinders.
Solution Approach 2:
The system changes the combustion phasing parameter in response to measured motored-cylinder temperature and operating point. By adjusting this critical parameter based on thermal conditions, the system achieves optimal balance between power generation and knock prevention.
2Reliability
If combustion phasing is retarded to prevent knock, then engine safety improves, but fuel consumption increases
Solution Approach 1:
The system employs feedback control by measuring motored-cylinder temperature and using this information to determine the appropriate combustion phasing. This closed-loop approach ensures that combustion timing is optimized for each operating condition, achieving knock-free operation with minimal fuel consumption.
Solution Approach 2:
The system performs preliminary determination of the knock-limited combustion phasing point based on measured motored-cylinder temperature before actual combustion occurs. This allows the engine control to proactively set optimal combustion timing that prevents knock while maximizing efficiency.
3Productivity
If dynamic adjustment of combustion phasing is implemented, then engine efficiency improves, but control system complexity increases
Solution Approach 1:
The system uses the engine's own operating parameters (motored-cylinder temperature, operating point) to automatically determine optimal combustion phasing. This self-regulating approach achieves high efficiency without requiring complex external control systems or extensive sensor arrays.
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 minimizes specific fuel consumption and prevents engine knock, enhancing engine efficiency and longevity by dynamically adjusting engine operation based on real-time data and calibrations.
Implementation Method 1
determining, using an accelerator pedal position sensor, an operator request for power
Implementation Method 2
combust an air and fuel mixture within cylinders to drive pistons and produce torque
Implementation Method 3
A motored-cylinder temperature is determined based upon the engine operating point
Data Source
AI summary
An internal combustion engine includes a method for operating including, determining, using an accelerator pedal position sensor, an operator request for power and determining an engine operating point based upon the operator request for power. A motored-cylinder temperature is determined based upon the engine operating point, and a knock-limited combustion phasing point is determined based upon the motored-cylinder temperature and the engine operating point. Engine operating parameters associated with achieving the knock-limited combustion phasing point are selected. Operation includes controlling, by a controller, engine control states in response to the engine operating parameters associated with achieving the knock-limited combustion phasing point and the operator request for power.