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Regeneration device for exhaust gas sensor and gas control system using the regeneration device

A technology of exhaust gas sensor and regeneration device, which is applied in the direction of electric control, electrical control, engine control, etc. of exhaust treatment devices, and can solve problems such as poor mileage and fuel consumption

Inactive Publication Date: 2012-12-26
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, devices arranged in the exhaust gas duct must frequently be subjected to an increase in the temperature of the exhaust gas
In addition, the mileage and fuel consumption may also be poor

Method used

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  • Regeneration device for exhaust gas sensor and gas control system using the regeneration device
  • Regeneration device for exhaust gas sensor and gas control system using the regeneration device
  • Regeneration device for exhaust gas sensor and gas control system using the regeneration device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0020] The following will refer to Figure 1A The gas control system 10 of the first embodiment will be described.

[0021] The gas control system 10 includes an air flow meter (AFM) 12, an exhaust gas recirculation (EGR) valve 20, a diesel oxidation catalyst (DOC) 30, a diesel particulate filter (DPF) 40, an electric fan 50, an exhaust gas temperature sensor 60, an air-fuel ratio ( A / F) sensor 70, electronic control unit (ECU) 90, and the like. The gas control system 10 controls intake or exhaust for the diesel engine 2 . Fuel accumulated by a common rail (not shown) is injected into the engine 2 through a fuel injection valve 4 . The fuel injection valve 4 performs at least post-injection among after-injection and post-injection to be described below, thereby corresponding to the exhaust gas temperature raising portion.

[0022] The AFM 12 detects the amount of intake air flowing into the diesel engine 2 . The EGR valve 20 is located in an exhaust gas recirculation (EGR) ...

no. 2 approach

[0056] The structure of the gas control system 10 of the second embodiment is basically the same as that of the first embodiment. The control program is stored in a ROM or a memory of the ECU 90 . The ECU 90 of the second embodiment also includes a regeneration period estimation unit for estimating the regeneration period.

[0057] The reproduction period estimation unit will be described below. Since the DPF 40 collects the particulates in the exhaust passage 100 , the particulates are accumulated in the DPF 40 . When a predetermined amount of fine particles is accumulated, the collection efficiency of the DPF 40 to collect fine particles decreases. Therefore, the DPF 40 needs to be regenerated by burning the collected particulates. The ECU 90 estimates the amount of particulates accumulated in the DPF 40 based on the history of the operating state of the engine 2 . Then, the ECU 90 estimates the elapsed regeneration period before the regeneration process to remove the ac...

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PUM

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Abstract

The present invention provides a detection unit for detecting response time (CTP) of an exhaust gas sensor. When an estimation unit estimates that the CTP is not less than predetermined time, an exhaust gas temperature unit increases temperature (ET) of the exhaust gas, and a flow speed control unit increases flow speed of the exhaust gas. Therefore, a regeneration device may remove particle attached on the exhaust gas sensor, the exhaust gas sensor detects exhaust gas component in an exhaust gas channel of an internal combustion engine. The invention further relates to a regeneration device and an gas control system using the regeneration device.

Description

technical field [0001] The invention relates to a regeneration device for an exhaust gas sensor, and a gas control system using the regeneration device. Background technique [0002] JP-A-2006-505738 (corresponding to US 2007 / 0006576A1) discloses a particulate removal device such as a diesel particulate filter (DPF). The DPF collects (traps) particulates discharged from the internal combustion engine into the exhaust gas passage (exhaust passage). Thus, the DPF prevents the toxic components of the particles from being released into the air. Fuel is added to the exhaust gas to increase the temperature of the exhaust gas so that the particulates collected by the DPF are burned. Therefore, the DPF can be regenerated. [0003] The emission of toxic components from internal combustion engines into the exhaust passage needs to be further reduced as regulations against the emission of toxic components become stricter. Therefore, intake and exhaust need to be precisely controlle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D43/00
CPCF02D41/029F02D41/1446F02D41/1474F02D41/402Y02T10/47F01N9/002F02D21/08Y02T10/40
Inventor 山本匠实小坂友二
Owner DENSO CORP
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