Particulate Measurement System with Operating Condition Correction
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Solution Overview
Problem
The accuracy of particulate measurement systems in exhaust gases from internal combustion engines is compromised by varying operating conditions such as vehicle speed, engine rotational speed, and torque, leading to inconsistent measurement results.
Innovation Solution
A particulate measurement system that includes an ion generation section, an electrification chamber, a trapping section, and a measurement signal generation circuit, which corrects the measurement signal based on one or more of vehicle speed, engine rotational speed, and engine torque to maintain accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional particulate measurement is performed without correction, then the measurement system is simple, but measurement accuracy deteriorates under varying operating conditions
Solution Approach 1:
The system performs preliminary correction by obtaining operating condition parameters (vehicle speed, engine rotational speed, engine torque) and using these parameters to correct the measurement signal before final particulate amount determination. This preliminary action compensates for operating condition variations and maintains measurement accuracy across different conditions.
Solution Approach 2:
The system changes the measurement approach by introducing correction based on operating condition parameters. Instead of directly measuring particulates without context, the system modifies the measurement signal using parameters that reflect actual operating conditions, thereby adapting the measurement to varying environments.
2Measurement precision
If measurement correction based on operating conditions is implemented, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The system implements feedback by continuously monitoring operating condition parameters (vehicle speed, engine rotational speed, engine torque) and using this information to correct the measurement signal. This feedback loop ensures that measurements are continuously adjusted to reflect actual operating conditions, maintaining accuracy without requiring complex hardware modifications.
Solution Approach 2:
The system uses operating condition parameters as intermediaries between the raw measurement signal and the final particulate amount determination. These parameters serve as mediators that carry information about operating conditions and enable correction of the measurement signal without direct complex interaction between measurement components and operating conditions.
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
The correction mechanism significantly improves measurement accuracy by accounting for changes in operating conditions, ensuring precise particulate quantification in exhaust gases.
Implementation Method 1
an ion generation section for generating ions by corona discharge
Data Source
AI summary
A particulate amount determination section of a particulate measurement system corrects a measurement signal or the amount of particulates determined from the measurement signal based on one or a plurality of three operating condition parameters selected from speed of the vehicle, rotational speed of the internal combustion engine and torque of the internal combustion engine.