EXHAUST GAS MEASURING DEVICE AND METHOD FOR MEASURING EXHAUST GAS

• US 20060218988A1
• Filed: 04/04/2006
• Published: 10/05/2006
• Est. Priority Date: 04/04/2005
• Status: Active Grant

• Current Assignee: Horiba Limited
• Original Assignee: Horiba Limited
• Inventors: Nakamura, Hiroshi
• Granted Patent: US 7,328,606 B2
• Time in Patent Office: Days
• US Class Current: 73/23.310
• CPC Class Codes: G01M 15/102 by monitoring exhaust gases
• CPC Class Codes: G01N 33/004 for CO, CO2
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

With the exhaust gas measuring device and the exhaust gas measuring method, the workload of the internal combustion engine is calculated based on a discharged amount of a component related to a carbon compound such as CO, CO₂ and THC in the exhaust gas discharged from the internal combustion engine. As a result, the workload of the internal combustion engine can be calculated easily without using torque data of the ECU and the mass of each component in the exhaust gas discharged from the internal combustion engine per unit workload can be calculated.

Claims

1. An exhaust gas measuring device comprising:

an exhaust gas concentration measuring part that measures concentration of a component related to a carbon compound in exhaust gas discharged from an internal combustion engine;

wherein a discharged amount of the component related to the carbon compound is calculated based on the measured concentration of the component related to the carbon compound and a flow rate of the exhaust gas, and a workload of the internal combustion engine is calculated based on the discharged amount.

2. The exhaust gas measuring device of claim 1, wherein mass of the exhaust gas discharged from the internal combustion engine per unit workload is calculated based on the workload of the internal combustion engine.

3. The exhaust gas measuring device of claim 1, wherein mass of a predetermined component in the exhaust gas discharged from the internal combustion engine per unit workload is calculated based on the workload of the internal combustion engine.

4. The exhaust gas measuring device of claim 1, wherein the component related to the carbon compound is a plurality of components including at least CO, CO₂ and a hydrocarbon class.

5. The exhaust gas measuring device of claim 1, wherein an amount of fuel consumption is calculated based on the discharged amount of the component related to the carbon compound and the workload of the internal combustion engine is calculated by multiplying predetermined combustion energy of the fuel by a combustion efficiency of the internal combustion engine.

6. The exhaust gas measuring device of claim 1, wherein the concentration of the component related to the carbon compound in the exhaust gas is obtained by integration in a particular time zone and a discharged amount of the component related to the carbon compound in the exhaust gas discharged from the internal combustion engine in the time zone is calculated based on the integrated value of the concentration.

7. The exhaust gas measuring device of claim 6, wherein the time zone is determined in accordance with a pulsation cycle of flow of the exhaust gas.

8. A vehicle-mountable exhaust gas analyzer wherein a discharged amount of a component related to a carbon compound in exhaust gas discharged from an internal combustion engine is continuously measured in a time-series order and a workload of the internal combustion engine is calculated based solely on the discharged amount.

9. A method for measuring exhaust gas comprising:

measuring concentration of a component related to a carbon compound in exhaust gas discharged from an internal combustion engine;

determining a discharged amount of the component related to the carbon compound based on the measured concentration of the component and a flow rate of the exhaust gas; and

determining a workload of the internal combustion engine based on the discharged amount.

10. The method for measuring exhaust gas of claim 9, wherein mass of the exhaust gas discharged from the internal combustion engine per unit workload is calculated based on the workload of the internal combustion engine.

11. The method for measuring exhaust gas of claim 9, wherein mass of a predetermined component in the exhaust gas discharged from the internal combustion engine per unit workload is calculated based on the workload of the internal combustion engine.