Outlet Valve Function Check via Exhaust Pressure Sensing
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Solution Overview
Problem
Existing methods for diagnosing the function of outlet valves in internal combustion engines are not precise enough to detect faults in variable actuation, particularly in the exhaust system, where pressure variations can indicate malfunctions.
Innovation Solution
A method involving the sensing of exhaust gas pressure using a pressure sensor, comparing it with predefined comparison values such as pressure values, gradients, or integrals over time profiles to evaluate the function of the outlet valve, allowing for precise detection of faults and correct functioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing diagnostic methods are used for outlet valve function checking, then the diagnosis can be performed, but the measurement precision is insufficient to detect faults in variable actuation
Solution Approach 1:
The patent replaces complex mechanical diagnostic systems with a pressure-based sensing system. By using a pressure sensor to monitor exhaust gas pressure and comparing it against reference values, the system achieves precise fault detection without requiring complex mechanical diagnostic apparatus. This substitution of mechanical diagnostic methods with pressure sensing resolves the contradiction between measurement precision and device complexity.
2Measurement precision
If pressure sensing is used to detect outlet valve faults, then measurement precision improves, but the difficulty of detecting and measuring increases due to pressure variations in the exhaust system
Solution Approach 1:
The patent implements a feedback mechanism where the sensed exhaust gas pressure is continuously compared against reference pressure values or pressure gradients. This feedback loop allows the system to account for normal pressure variations in the exhaust system and identify deviations that indicate valve malfunctions. By using feedback comparison, the system overcomes the difficulty of measuring pressure in a dynamically varying exhaust environment while maintaining high detection precision.
Solution Approach 2:
The patent monitors changes in pressure parameters (pressure values, pressure gradients, pressure integrals) rather than attempting to measure absolute pressure directly. By focusing on parameter changes and comparisons, the system can detect valve faults despite the inherently variable pressure conditions in the exhaust system, thereby reducing the difficulty of measurement while maintaining precision.
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
Enables precise evaluation of outlet valve functionality, enabling early detection of malfunctions and adjustments to minimize their impact on engine performance, fuel consumption, and emissions.
Implementation Method 1
sensing an exhaust gas pressure in an exhaust section of the internal combustion engine
Data Source
AI summary
A method for checking a function of an outlet valve of an internal combustion engine includes sensing an exhaust gas pressure in an exhaust section of the internal combustion engine. The sensed exhaust gas pressure is compared with a comparison value so as to provide a comparison result and the function of the outlet valve is evaluated as a function of the comparison result.