Oxygen sensor with heater
First Claim
Patent Images
1. An oxygen sensor comprising:
- a tubular solid electrolyte body having an elongate bore therein, a first end of said elongate bore is closed by one end of said tubular solid electrolyte body and a second end of said elongate bore is open at a second end of said tubular solid electrolyte body, said tubular body having reference and measuring electrodes on inner and outer surfaces thereof, respectively;
a housing body which supports said tubular solid electrolyte body such that said outer surface of said tubular body is exposed at said one end of said tubular body to an exhaust gas, said housing body maintaining said elongate bore in a gas-tight condition with respect to said exhaust gas and said one end of said tubular body extends outwardly from said housing body; and
a bar-shaped heater inserted in said elongate bore of said tubular solid electrolyte body, and comprising a resistance heating portion having a positive temperature coefficient of resistance of not less than 0.3%/°
C.,and a ceramic body carrying said resistance heating portion, the resistance heating portion being located only in said one end of the tubular body which extends outwardly from the housing body and not extending past said housing body.
1 Assignment
0 Petitions
Accused Products
Abstract
An oxygen sensor having a bar-shaped heater inserted in an elongate bore formed in a tubular solid electrolyte body which has porous platinum electrodes on its inner and outer surfaces and which is supported by a housing such that its closed end portion is exposed to exhaust gas and such that the elongate bore is gas-tight with respect to the exhaust gas. The bar-shaped heater comprises a heating resistor having a positive temperature coefficient, and a ceramic boyd carrying the heating resistor so as to embed the latter.
-
Citations
15 Claims
-
1. An oxygen sensor comprising:
-
a tubular solid electrolyte body having an elongate bore therein, a first end of said elongate bore is closed by one end of said tubular solid electrolyte body and a second end of said elongate bore is open at a second end of said tubular solid electrolyte body, said tubular body having reference and measuring electrodes on inner and outer surfaces thereof, respectively; a housing body which supports said tubular solid electrolyte body such that said outer surface of said tubular body is exposed at said one end of said tubular body to an exhaust gas, said housing body maintaining said elongate bore in a gas-tight condition with respect to said exhaust gas and said one end of said tubular body extends outwardly from said housing body; and a bar-shaped heater inserted in said elongate bore of said tubular solid electrolyte body, and comprising a resistance heating portion having a positive temperature coefficient of resistance of not less than 0.3%/°
C.,and a ceramic body carrying said resistance heating portion, the resistance heating portion being located only in said one end of the tubular body which extends outwardly from the housing body and not extending past said housing body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. An oxygen sensor comprising:
-
a tubular solid electrolyte body having an elongate bore therein, a first end of said elongate bore is closed by one end of said tubular solid electrolyte body and a second end of said elongate bore is open at a second end of said tubular solid electrolyte body, said tubular body having reference and measuring electrodes on inner and outer surfaces thereof, respectively; a housing body which supports said tubular solid electrolyte body such that said outer surface of said tubular body is exposed at said one end of said tubular body to an exhaust gas, said housing body maintaining said elongate bore in a gas-tight condition with respect to said exhaust gas and said one end of said tubular body extends outwardly from said housing body; and a bar-shaped heater inserted in said elongate bore of said tubular solid electrolyte body, and comprising a resistance heating portion having a positive temperature coefficient of resistance of not less than 0.3%/°
C. and a ceramic body carrying said resistance heating portion so as to embed the resistance heating portion therein, the resistance heating portion being located only in said one end of the tubular body which extends outwardly from the housing body and not extending past said housing body.
-
-
15. An oxygen sensor comprising:
-
a tubular solid electrolyte body having an elongate bore therein, a first end of said elongate bore is closed by one end of said tubular solid electrolyte body and a second end of said elongate bore is open at a second end of said tubular solid electrolyte body, said tubular body having reference and measuring electrodes on inner and outer surfaces thereof, respectively; a housing body which supports said tubular solid electrolyte body such that said outer surface of said tubular body is exposed at said one end of said tubular body to an exhaust gas, said housing body maintaining said elongate bore in a gas-tight condition with respect to said exhaust gas and said one end of said tubular body extends outwardly from said housing body; a protective cylindrical member enclosing said ene end of the tubular solid electrolyte body, said protective cylindrical member having at least one opening to permit said exhaust gas to be in contact with said one end of said tubular body; and a bar-shaped heater inserted in said elongate bore of said tubular solid electrolyte body, and comprising a resistance heating portion having a positive temperature coefficient of resistance of not less than 0.3%/°
C. and a ceramic body carrying said resistance heating portion, the resistance heating portion being located only in said one end of the tubular body and extending only within the protective cylindrical member enclosing said one end of said tubular solid electrolyte body.
-
Specification