Internal Combustion Engine Crankcase Pressure Feedback Control
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Solution Overview
Problem
Internal combustion engines face challenges in achieving stable operation with minimal exhaust gas emissions due to variations in operating states, particularly in crankcase pressure, which existing methods fail to address effectively.
Innovation Solution
The method involves measuring crankcase pressure and using it to determine adjustable operating parameters, such as fuel quantity and ignition timing, through a pressure sensor, allowing for precise control of the engine to optimize performance and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional operating methods are used without pressure measurement, then the device complexity is low, but the engine operation stability and exhaust gas values are insufficient
Solution Approach 1:
The patent implements a feedback control mechanism where a pressure sensor continuously monitors crankcase pressure and feeds this information to a control unit. The control unit adjusts fuel quantity and ignition timing based on the measured pressure values, creating a closed-loop system that automatically maintains optimal engine operation. This feedback approach directly improves reliability by adapting to varying operating conditions while keeping the control system relatively simple through the use of a single primary sensor.
2Object-generated harmful factors
If pressure measurement and adjustment is implemented, then the engine operation stability and exhaust gas values improve, but the device complexity increases
Solution Approach 1:
The pressure sensor provides continuous feedback on crankcase pressure, enabling the control unit to optimize fuel injection quantity and ignition timing in real-time. This feedback loop ensures complete combustion and minimizes harmful exhaust emissions by maintaining the optimal air-fuel ratio across all operating conditions.
Solution Approach 2:
The system dynamically changes key operating parameters (fuel quantity and ignition timing) based on measured crankcase pressure. By adjusting these parameters in response to pressure variations, the engine maintains optimal combustion efficiency and minimal emissions throughout its operating range.
3Measurement precision
If multiple pressure measurements per working cycle are performed, then the measurement precision improves, but the productivity decreases
Solution Approach 1:
The system performs pressure measurements at specific periodic intervals within the engine's working cycle, such as at predetermined crankshaft angles or at specific phases (intake, compression, expansion, exhaust). This periodic measurement approach provides sufficient precision for control purposes without continuously sampling, thereby maintaining engine productivity and response speed.
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 stable engine operation with minimized exhaust gas emissions by accurately adjusting fuel and air ratios and ignition timing based on real-time pressure measurements, resulting in improved engine efficiency and reduced emissions.
Implementation Method 1
a pressure is measured and, based on the measured pressure, an adjustable value for at least one controllable operating parameter of the internal combustion engine is determined
Data Source
AI summary
An internal combustion engine has a cylinder with a combustion chamber delimited by a reciprocating piston that drives a crankshaft rotatably supported in a crankcase. The internal combustion engine has an intake passage, an exhaust connected to the combustion chamber, a device supplying fuel, and a control device controlling at least one operating parameter of the internal combustion engine. The internal combustion engine is operated in that a pressure is measured in operation of the internal combustion engine, an adjustable value for at least one operating parameter of the internal combustion engine is deteremined based on the measured pressure, and the determined adjustable value is set for optimized running of the engine.