Particulate matters sensor device and manufacturing method of sensor unit provided in this

Abstract

Disclosed is a particulate matters sensor device detecting particulate matters (PM) included in exhaust gas, including: a detecting device having detecting electrodes formed on an external peripheral surface of a base having a bar shape with a circular cross section at a predetermined interval in a predetermined direction to sense the particulate matters included in the exhaust gas.

What is claimed is: 
     
         1 . A particulate matters sensor device detecting particulate matters (PM) included in exhaust gas, comprising:
 a detecting device having detecting electrodes formed on an external peripheral surface of a base having a bar shape with a circular cross section at a predetermined interval in a predetermined direction to sense the particulate matters included in the exhaust gas.   
     
     
         2 . The particulate matters sensor device of  claim 1 , wherein the detecting electrodes are formed in a flow direction of the exhaust gas. 
     
     
         3 . The particulate matters sensor device of  claim 1 , wherein based on the detecting electrodes, in the base, a temperature electrode configured to sense a temperature, and a heating electrode configured to generate heat are formed. 
     
     
         4 . The particulate matters sensor device of  claim 2 , further including:
 a first tube into which the detecting device is inserted in a longitudinal direction thereof,   wherein a first passage through which the exhaust gas is discharged is formed at an end portion thereof corresponding to an end portion of the detecting device and a second passage through which the exhaust gas flows from an external surface to an internal surface of the first tube at an opposite side to the first passage based on the detecting electrodes is formed.   
     
     
         5 . The particulate matters sensor device of  claim 4 , further including:
 a second tube having an internal peripheral surface corresponding to the external surface of the first tube,   wherein a third tube through which the exhaust gas flows in from an outside to an inside thereof is formed on an end surface of the second tube.   
     
     
         6 . The particulate matters sensor device of  claim 4 , wherein the detecting electrodes are formed in a longitudinal direction of the base. 
     
     
         7 . The particulate matters sensor device of  claim 4 , further including:
 the first tube into which the detecting device is inserted in the longitudinal direction thereof,   wherein the first and second passages through which the exhaust gas flows in or out are formed at least at a first side and a second side of a position corresponding to the detecting electrodes in the first tube, and   guides which guide the exhaust gas passing through the first and second passages to flow on a circumference of the detecting device are formed on the internal surface of the first tube.   
     
     
         8 . The particulate matters sensor device of  claim 7 , wherein the detecting electrodes are formed in a circumferential direction of the base. 
     
     
         9 . The particulate matters sensor device of  claim 2 , further including:
 the first tube into which the detecting device is inserted in the longitudinal direction thereof,   wherein the first passage through which the exhaust gas is discharged is formed at an end portion corresponding to an end portion of the detecting device and the second passage through which the exhaust gas flows from an external surface to an internal surface of the first tube at an opposite side to the first passage based on the detecting electrode is formed, and   guides are formed on an internal surface of the second passage wherein the exhaust gas is discharged through the first passage while rotating along an external peripheral surface of the detecting device.   
     
     
         10 . The particulate matters sensor device of  claim 9 , wherein
 the detecting electrodes are formed in a screw shape to rotate along the external peripheral surface of the detecting device from the first passage to the second passage.   
     
     
         11 . A manufacturing method of a detecting device, comprising:
 preparing a base having a shape corresponding to an external peripheral surface of a cylinder;   preparing a sheet in which detecting electrodes detecting particulate matters extend in a predetermined direction at a predetermined interval;   attaching the sheet onto the external peripheral surface of the base; and   sintering the sheet at a predetermined temperature to fix the sheet to the base.   
     
     
         12 . The method of  claim 11 , further including:
 forming a temperature electrode for detecting a temperature on the sheet; and   forming a heating electrode on the sheet,   wherein the detecting electrodes are formed on the temperature electrode or the heating electrode and the detecting electrodes are exposed to an outside thereof.   
     
     
         13 . The method of  claim 11 , wherein the detecting electrodes are configured to extend in the longitudinal direction of the base and are arrayed at a predetermined interval in a circumferential direction of the base. 
     
     
         14 . The method of  claim 11 , wherein the detecting electrodes extend in the circumferential direction of the base and are arrayed at a predetermined interval in the longitudinal direction of the base. 
     
     
         15 . The method of  claim 11 , wherein the detecting electrodes are formed to have a screw shape on an external peripheral surface of the detecting device. 
     
     
         16 . The method of  claim 11 , wherein the detecting electrode includes one of jewelry materials, and the base and the sheet include one of ceramic materials. 
     
     
         17 . The method of  claim 16 , wherein the detecting electrode includes at least one of W, MO, and Pt and the base, and the base and the sheet include one of Al 2 O 3 , Zirconia, AIN, and SiN.