OBD-Based CO2 Emission Monitoring via Fuel Consumption
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Solution Overview
Problem
Existing carbon dioxide emission monitoring systems, such as On-Board Emission Measurement Systems (OBS), are expensive, complex, and time-consuming to install and operate, and provide limited accuracy due to intrinsic errors in GPS-based methods, making it difficult to obtain instantaneous and reliable carbon dioxide emission data from vehicles.
Innovation Solution
A vehicle emission monitoring device and method utilizing an OBD system with an OBD connector, storage unit, and computation unit to obtain instantaneous fuel consumption, establish relationships between OBD and OBS fuel consumption, and convert this data into carbon dioxide emission, eliminating the need for an OBS system for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If OBS system is used to detect carbon dioxide emission, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses fuel consumption data as an intermediary parameter to indirectly calculate carbon dioxide emission. Instead of directly measuring CO2 with complex OBS equipment, the system measures fuel consumption (a simpler parameter) and converts it to CO2 emission using established relationships, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent creates a simplified measurement model that copies the functional relationship between fuel consumption and CO2 emission without replicating the full OBS measurement chain. By establishing calibration relationships between fuel consumption and actual CO2 emissions, the system creates a lightweight proxy measurement approach that avoids the complexity of direct CO2 sensing
2Measurement precision
If OBS system is deployed at specified sites, then measurement precision is improved, but loss of time increases due to inability to obtain instantaneous emission information
Solution Approach 1:
The patent enables continuous real-time monitoring of fuel consumption through the OBD system, which continuously reads data from the vehicle's fuel injection control unit. This continuous data stream allows for instantaneous calculation of CO2 emission without the time delays inherent in periodic sampling or stationary measurement approaches
Solution Approach 2:
The patent replaces the mechanical/stationary OBS measurement system with an electronic data processing approach. By substituting physical CO2 measurement with electronic calculation based on fuel consumption data from the vehicle's own control systems, the method achieves instantaneous results without the infrastructure requirements of traditional OBS deployment
3Device complexity
If OBD system is used to estimate waste gas emission, then device complexity is reduced, but measurement precision deteriorates due to rough estimation capability
Solution Approach 1:
The patent performs preliminary calibration by collecting paired data of fuel consumption (from OBD) and actual CO2 emission (from OBS) under various driving conditions. This pre-established calibration dataset and relationship model are stored in the system, enabling accurate conversion of future fuel consumption readings to CO2 emission values without requiring real-time OBS measurement
Solution Approach 2:
The patent uses feedback from the calibration process where actual OBS measurements are used to validate and refine the fuel consumption to CO2 emission conversion relationships. This feedback loop ensures that the estimation algorithm is continuously optimized against ground-truth data, improving precision while maintaining the simplicity of the OBD-based approach
4Device complexity
If GPS-based method is used to calculate carbon dioxide emission, then device complexity is reduced, but measurement precision deteriorates due to intrinsic GPS error
Solution Approach 1:
The patent extracts the relevant measurement data (fuel consumption) directly from the vehicle's own control systems rather than relying on external positioning data. By taking out the fuel consumption parameter from the fuel injection control unit via OBD, the system avoids the inherent errors of GPS-based displacement calculation and focuses on the direct cause (fuel consumption) of CO2 emission
Data Source
AI summary
The present invention discloses a vehicle emission monitoring device and a method thereof. The method of the present invention comprises steps: obtaining an OBS instantaneous fuel consumption and a carbon dioxide emission from an on-board emission measurement system (OBS); working out an OBS fuel consumption-carbon dioxide emission relationship with a statistical method or a regression method; obtaining an OBD instantaneous fuel consumption from an on-board diagnostic (OBD) system; establishing an OBS-OBD fuel consumption relationship; and converting the OBD instantaneous fuel consumption into an carbon dioxide emission according to the OBS-OBD fuel consumption relationship and the OBS fuel consumption-carbon dioxide emission relationship.