Motorcycle Exhaust Lambda Sensor Placement for Emission Validation
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Solution Overview
Problem
Current exhaust gas cleaning systems for single-track vehicles, such as motorcycles, are inadequate for meeting future emission standards like EU 5, as they lack validation of exhaust gas cleaning quality and are not efficiently designed for these vehicles.
Innovation Solution
Placing two lambda sensors in the exhaust gas flow of internal combustion engines, with the first sensor close to the cylinder head and the second sensor behind the catalytic converter, to effectively measure and validate the exhaust gas cleaning process, optimizing space usage and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single lambda sensor is placed upstream of the catalytic converter, then the control frequency is improved, but the validation of exhaust gas cleaning quality is lost
Solution Approach 1:
The exhaust gas measurement function is segmented into two distinct tasks performed by two separate lambda sensors: one sensor upstream of the catalytic converter for control purposes, and another sensor downstream for validation of cleaning quality. This segmentation allows both control frequency and cleaning validation to be achieved simultaneously without compromise.
2Measurement precision
If the first lambda probe is placed close to the cylinder head, then the measurement accuracy is improved, but the installation space requirements increase
Solution Approach 1:
The patent utilizes the vertical dimension and available space in the non-visible area of the motorcycle exhaust system. By routing exhaust system components with vertical flow (catalytic converters and silencers) between the rear wheel and swingarm, the design creates three-dimensional space utilization that accommodates the close placement of the first lambda probe near the cylinder head while maintaining compact overall packaging.
3Volume of moving object
If the second lambda probe is placed close to the catalytic converter, then the space usage is optimized, but the measurement of cleaned exhaust gas flow is compromised
Solution Approach 1:
The patent employs asymmetric positioning of the second lambda probe at a specific distance (maximum four times the diameter of the catalytic converter) downstream from the catalytic converter. This asymmetric placement optimizes the balance between space utilization and measurement accuracy by positioning the sensor in a location where the exhaust gas flow has stabilized enough for accurate measurement while still maintaining compact packaging suitable for motorcycle applications.
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 configuration enhances exhaust gas measurement, ensures more environmentally friendly operation, and meets future emission standards by validating the quality of exhaust gas cleaning, while efficiently utilizing available installation space.
Implementation Method 1
sensors are used to measure the oxygen concentration in the exhaust gas
Implementation Method 2
the internal combustion engine has a catalytic converter
Data Source
Figure 1
AI summary
The invention relates to an exhaust gas system for an internal combustion engine of a single-track vehicle, wherein the exhaust gas system can be arranged on an exhaust gas outlet of a cylinder head of the internal combustion engine and wherein a first lambda probe close to the cylinder head is provided in the exhaust gas system and is arranged before an exhaust gas cleaning system in the flow direction of an exhaust gas, wherein a second lambda probe is provided in the exhaust gas system after the exhaust gas cleaning system in the flow direction of the exhaust gas, wherein the second lambda probe is arranged at a maximum distance away from the exhaust gas cleaning system equal to four times the diameter of the exhaust gas cleaning system. As a result of the design of the exhaust gas system for an internal combustion engine of a single-track vehicle according to the invention, the lambda probe is arranged in the non-visible region of the single-track vehicle, while simultaneously examining the quality of the exhaust gas cleaning.