Abstract:
A planar oxygen sensor (1) having a pump cell (2), a reference cell (4), a sensor chamber (6) and a heating device (8), a ground plane electrode (10) including a sensing portion (18) having a first sense lead (20) and a second sense lead (22) and a measuring portion (24) having a first measuring lead (26) and a second measuring lead (28), wherein the first measuring lead (26) and the second measuring lead (28) have increased surface area relative to said sensing portion (18) such that the resistance between the first measuring lead (26) and the second measuring lead (28) is reduced and wherein the first measuring lead (26) is disposed so as to be communicated with the first sense lead (20) and the second measuring lead (28) is disposed so as to be communicated with the second sense lead (22). A method for measuring the temperature in a planar oxygen sensor (1) having a pump cell (2), a reference cell (4), a sensor chamber (6), a heating device (8) and a ground plane electrode (10) that includes a sensing portion (18) having a first sense lead (20) and a second sense lead (22) and a measuring portion (24) having a first measuring lead (26) and a second measuring lead (28). The method includes obtaining a temperature measurement device (52), communicating the temperature measurement device (52) with the first measuring lead (26) and the second measuring lead (28), operating the planar oxygen sensor (1) so as to cause the heating device (8) to heat the planar oxygen sensor (1), and measuring the resistance between the first measuring lead (26) and the second measuring lead (28).
Abstract:
A glow sensor (10, 74, 78, 90) provides functions of both a diesel engine glow plug for aiding fuel ignition during starting and low temperature operation and an ion sensor for sensing engine combustion initiation and characteristics. Compact glow sensor components may be assembled directly in combination with an engine combustion chamber defining component, such as a cylinder head, to provide a combination in which separate housings or shells for the glow sensors are not needed. Thus, the glow sensor elements (32, 76, 80, 91) and insulation may be made larger to provide greater electrical resistance in the ion sensor electrical circuit and enhance the operation of the ion sensor function. Various forms of glow sensors may optionally be used in such a combination including, for example, metal sheath (48) type glow sensors with either isolated or non-isolated coils and ceramic rod (82) or flat plate (92) type glow sensors. Exemplary embodiments of glow sensor components mounted in a cylinder head are disclosed.
Abstract:
A glow sensor (10) provides functions of both a diesel engine glow plug and an ion sensor for sensing engine combustion initiation and characteristics. A ceramic flat plate glow sensor element (16) is carried by a tubular ceramic sleeve (14) and insulating material (32) in a metal shell (12). The element (16) includes a ceramic flat plate (38) having a glow tip, on an inner end (40) with a heating element (50) on one side (44) and an ion sensor electrode (56) on the other (46) printed in electrically conductive ink. Printed conductors (52, 54, 58) on both sides connect the heating element (50) and ion sensor (56) with an outer end (42) of the glow sensor element (46) for connection with an electric power source. An insulating coating (60) protects the heating element (50) and conductors (52, 54, 58) from exposure to combustion gases. Various flat plate mounting embodiments are disclosed.
Abstract:
A gas sensor (210) includes a heater (222) having a connection portion (270) that has a characteristic cross sectional geometry, a heating portion (272) that has a characteristic cross sectional geometry, and a transition portion (274) disposed intermediate the connection (270) and heating portions (272). The transition portion (274) has a cross sectional geometry that is variable along a length thereof to effectuate a smooth transition between the connection portion (270) and the heating portion (272). Typically, the cross sectional geometry of the connection portion (270) is substantially rectangular in shape, while the cross sectional geometry of the heating portion (272) is substantially round. A method of manufacturing the heater (222) having varying cross sectional geometries includes shaping a core material to have a substantially rectangular cross sectional geometry on a first end (228) thereof, shaping the core material to have a substantially round cross sectional geometry on an opposing end (229) thereof, and shaping the core material intermediate the opposing ends (228,229) to effectuate a smooth transition between the portion having the substantially rectangular cross sectional geometry and the portion having the substantially round cross sectional geometry.
Abstract:
A glow sensor (10, 60, 100, 130, 140, 154) provides functions of both a diesel engine glow plug and an ion sensor for sensing engine combustion initiation and characteristics. The sensor includes a tubular metal sheath (14, 64) supported by various embodiments of electrical insulating and retaining means in a metal shell (12, 62) mountable in an engine cylinder head. The metal sheath (14, 64) includes a heating element (24) in a glow tip (22) at an inner end of the sheath (14, 64) which, in use, extends into an engine combustion chamber or pre-chamber and is connected by a conductor with a source of electric voltage. In use, the voltage produces a current carried by electrons generated by ionization of the combustion chamber gases during combustion. The current varies with the degree of ionization and the amount of electrons generated during various phases of the combustion event. The resulting information is usable in controlling engine operation or evaluating its operation for test purposes. Various construction features of disclosed embodiments include isolated or non-isolated heating coils for electric heaters (24) within the glow tip (22) with various arrangements for internally connecting and grounding the electrical elements in the glow sensor (10, 60, 100, 130, 140, 154).
Abstract:
A glow sensor (10, 74, 78, 90) provides functions of both a diesel engine glow plug for aiding fuel ignition during starting and low temperature operation and an ion sensor for sensing engine combustion initiation and characteristics. Compact glow sensor components may be assembled directly in combination with an engine combustion chamber defining component, such as a cylinder head, to provide a combination in which separate housings or shells for the glow sensors are not needed. Thus, the glow sensor elements (32, 76, 80, 91) and insulation may be made larger to provide greater electrical resistance in the ion sensor electrical circuit and enhance the operation of the ion sensor function. Various forms of glow sensors may optionally be used in such a combination including, for example, metal sheath (48) type glow sensors with either isolated or non-isolated coils and ceramic rod (82) or flat plate (92) type glow sensors. Exemplary embodiments of glow sensor components mounted in a cylinder head are disclosed.
Abstract:
A glow sensor (10) provides functions of both a diesel engine glow plug and an ion sensor for sensing engine combustion initiation and characteristics. A ceramic flat plate glow sensor element (16) is carried by a tubular ceramic sleeve (14) and insulating material (32) in a metal shell (12). The element (16) includes a ceramic flat plate (38) having a glow tip, on an inner end (40) with a heating element (50) on one side (44) and an ion sensor electrode (56) on the other (46) printed in electrically conductive ink. Printed conductors (52, 54, 58) on both sides connect the heating element (50) and ion sensor (56) with an outer end (42) of the glow sensor element (46) for connection with an electric power source. An insulating coating (60) protects the heating element (50) and conductors (52, 54, 58) from exposure to combustion gases. Various flat plate mounting embodiments are disclosed.
Abstract:
A glow sensor (10, 60, 100, 130, 140, 154) provides functions of both a diesel engine glow plug and an ion sensor for sensing engine combustion initiation and characteristics. The sensor includes a tubular metal sheath (14, 64) supported by various embodiments of electrical insulating and retaining means in a metal shell (12, 62) mountable in an engine cylinder head. The metal sheath (14, 64) includes a heating element (24) in a glow tip (22) at an inner end of the sheath (14, 64) which, in use, extends into an engine combustion chamber or pre-chamber and is connected by a conductor with a source of electric voltage. In use, the voltage produces a current carried by electrons generated by ionization of the combustion chamber gases during combustion. The current varies with the degree of ionization and the amount of electrons generated during various phases of the combustion event. The resulting information is usable in controlling engine operation or evaluating its operation for test purposes. Various construction features of disclosed embodiments include isolated or non-isolated heating coils for electric heaters (24) within the glow tip (22) with various arrangements for internally connecting and grounding the electrical elements in the glow sensor (10, 60, 100, 130, 140, 154).