Vehicle emission monitoring device and method thereof

• US 8,935,084 B2
• Filed: 12/29/2010
• Issued: 01/13/2015
• Est. Priority Date: 12/29/2010
• Status: Active Grant

• Current Assignee: Automotive Research & Testing Center
• Original Assignee: Automotive Research & Testing Center
• Inventors: Lin, Ke-Wei, Chen, Shih-Chang, Shiue, Yu-Chi, Chuang, Chih-Wei
• Primary Examiner(s): Algahaim, Helal A
• Assistant Examiner(s): Han, Charles J
• Application Number:
  US12/980,957
• Publication Number:
  US 20120173132A1
• Time in Patent Office: 1,476 Days
• Field of Search: 701/123, 701/33.4, 701/102, 702/24, 73/233.1, 731/147.6
• US Class Current: 701/123
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 2560/00 Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
• CPC Class Codes: F01N 2900/08 said parameters being related to the engine
• CPC Class Codes: G07C 5/0808 Diagnosing performance data testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

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.

Claims

1. A vehicle emission monitoring device including instantaneous fuel consumption data and carbon dioxide emission data pre-stored in a memory device thereof from a non-dispersive infrared analyzer on-board emission measurement system (OBS), said vehicle emission monitoring device, comprising:

an on-board diagnostic (OBD) connector connecting with an OBD system to receive an OBD instantaneous fuel consumption of said vehicle; and

a processor electrically connecting with said OBD connector and said memory device to receive information of vehicle statuses, said processor configured to;

determine;

(1) an OBS-OBD fuel consumption relationship; and

, (2) an OBS fuel consumption-carbon dioxide emission relationship from said instantaneous fuel consumption data and said carbon dioxide emission data pre-stored in said memory device from the OBS, said OBS-OBD fuel consumption relationship being determined by defining a distinct set of non-overlapping torque ranges and establishing a corresponding set of distinct equations assigned respectively thereto relating said instantaneous fuel consumption from the OBS to said OBD instantaneous fuel consumption per each corresponding non-overlapping torque range;

store said OBS-OBD fuel consumption relationship and said OBS fuel consumption-carbon dioxide emission relationship in said memory device;

obtain an OBD instantaneous fuel consumption;

selectively determine a calibrated value of said OBD instantaneous fuel consumption based on said OBS-OBD fuel consumption relationship; and

determine a carbon dioxide emission of said calibrated value as a function of an OBS-OBD fuel consumption-carbon dioxide emission relationship while decoupled from the on-board emission measurement system (OBS).

2. The vehicle emission monitoring device according to claim 1, wherein said fuel consumption relationship is expressed by

Y_OBS—

_fuel(x<sub>OBD—

fuel</sub>)=Z

wherein Y<sub>OBS—

fuel</sub> is a fuel consumption detected by an on-board emission measurement system (OBS), x<sub>OBD—

fuel</sub> a fuel consumption detected by said OBD system, and Z a constant.

3. The vehicle emission monitoring device according to claim 1, wherein said fuel consumption-carbon dioxide emission relationship is expressed by

4. The vehicle emission monitoring device according to claim 1 further comprising a wireless communication unit electrically connecting with said processor to receive or transmit wireless signals.

9. The vehicle emission monitoring device according to claim 1, wherein said OBS fuel consumption-carbon dioxide emission relationship is expressed by:

y=0.3177x−

2E−

05, wherein x is carbon dioxide emission (g/s), and y is OBS instantaneous fuel consumption (g/s).

5. A vehicle emission monitoring method comprising steps:

using a non-dispersive infrared analyzer on-board emission measurement system (OBS) device to obtain instantaneous fuel consumption data and carbon dioxide emission data from said vehicle;

storing the instantaneous fuel consumption data and carbon dioxide emission data in a memory device;

maintaining the memory device operatively decoupled from the OBS device;

using a processor to determine an OBS fuel consumption-carbon dioxide emission relationship based upon the carbon dioxide emission data with a statistical method or a regression method;

obtaining an OBD instantaneous fuel consumption data from an on-board diagnostic (OBD) system;

establishing an OBS-OBD fuel consumption relationship with said OBD instantaneous fuel consumption data being an independent variable and said OBS instantaneous fuel consumption data being a dependent variable, said OBS-OBD fuel consumption relationship being determined by defining a distinct set of non-overlapping torque ranges and establishing a corresponding set of distinct equations assigned respectively thereto relating said OBS fuel consumption to said OBD fuel consumption per each corresponding non-overlapping torque range; and

converting said OBD instantaneous fuel consumption data into carbon dioxide emission data according to said OBS-OBD fuel consumption relationship and said OBS fuel consumption-carbon dioxide emission relationship while decoupled from the on-board emission measurement system (OBS).

6. The vehicle emission monitoring method according to claim 5, wherein establishing said OBS-OBD fuel consumption relationship further comprising steps:

selecting said OBS instantaneous fuel consumption data and said OBD instantaneous fuel consumption data occurring under substantially identical conditions from a database of said OBS system and said OBD system to obtain statistical values thereof;

using said statistical values to draw a distribution diagram of said OBS instantaneous fuel consumption data and said OBD instantaneous fuel consumption data according to a statistical method or a regression method; and

obtaining said OBS-OBD fuel consumption relationship from said distribution diagram.

7. The vehicle emission monitoring method according to claim 5, wherein said OBS fuel consumption-carbon dioxide emission relationship is expressed by

8. The vehicle emission monitoring method according to claim 5, wherein said OBS-OBD fuel consumption relationship is expressed by Y_OBS—

_fuel(x<sub>OBD—

fuel</sub>)=Z wherein Y<sub>OBS—

fuel</sub> is a fuel consumption detected by said OBS, x<sub>OBD—

fuel</sub> a fuel consumption detected by said OBD system, and Z a constant.

10. The vehicle emission monitoring method according to claim 5, wherein said OBS fuel consumption-carbon dioxide emission relationship is expressed by:

y=0.3177x−

2E−

05, wherein x is carbon dioxide emission (g/s), and y is OBS instantaneous fuel consumption (g/s).