Exhaust particulate matter measuring apparatus

a technology of particulate matter and measuring apparatus, which is applied in the direction of exhaust treatment electric control, electrical control, instruments, etc., can solve the problems of inability to accurately combust the soot particles settled on the molded member, and inability to measure the amount of soot with high accuracy, and achieve the effect of accurate measuremen
US20090094963A1Inactive Publication Date: 2009-04-16TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2009-04-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

A PM sensor for measuring particle matter in exhaust gas is disposed between a three-way catalyst and a muffler in an exhaust pipe, and has an oxidation catalyst and an electrical heater that are stacked together, and a temperature sensor that measures a temperature of the oxidation catalyst interposed between the oxidation catalyst and the electrical heater. The oxidation catalyst carries a ceria as an oxygen-storing agent that occludes oxygen in the exhaust gas, and a ECU calculates a sediment amount of the exhaust particulate matter based on an amount of temperature rise when the electrical heater heats the oxidation catalyst and an accumulated value of an intake air amount.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an exhaust particulate matter measuring apparatus that measures the amount of particulate matter present in exhaust gas.

[0003] 2. Description of the Related Art

[0004] A conventional direct-injection type of internal combustion engine is known in which fuel is injected directly into a combustion chamber, rather than into an intake port. In this direct-injection type internal combustion engine, when the intake valve is open, air is drawn into the combustion chamber from the intake port and compressed by a piston, an injector directly injecting fuel to this high-pressure air. The high-pressure air in the combustion chamber and the fuel mist are mixed, and the resulting air-fuel mixture is ignited by a spark plug to cause an explosion to generate driving power. When the exhaust valve is open, the exhaust gas after combustion is discharged from an exhaust port.

[0005] In an internal combustion en...

Claims

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