Gas sensor units for engines
First Claim
1. A gas sensor unit for an engine comprising:
- a sensor chamber of said unit;
a gas sensor adapted to detect a combustible gas, said gas sensor being disposed in said sensor chamber to detect a density of a particular ingredient of said combustible gas contained in an exhaust gas exhausted from a cylinder of said engine, and to output a detection signal to a control unit; and
means for damping vibration, wherein said means for damping vibration is adapted to support at least one of said gas sensor unit or said combustible gas sensor disposed in said gas sensor unit, such that said gas sensor unit or said combustible gas sensor is movable by an amount equal to or less than a predetermined extent of movement of said engine, thereby to reduce vibration from said engine from transmitting directly to said gas sensor unit or said combustible gas sensor.
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Accused Products
Abstract
In a multipurpose engine with a reduced or limited displacement adapted for use in a portable work machine or the like, the engine includes a detecting element of a gas sensor for controlling an air-fuel ratio. Damage or degradation of the detecting element due to vibration from the engine is reduced or eliminated. To achieve this, a supporting device having a vibration-damping-function is provided for supporting the gas sensor or the gas sensor unit containing the gas sensor. The supporting device permits the gas sensor or the gas sensor unit to move by an amount equal to or less than a predetermined extent of movement of the engine, so that the transmission of vibration from the engine directly to the gas sensor is reduced or eliminated.
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Citations
20 Claims
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1. A gas sensor unit for an engine comprising:
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a sensor chamber of said unit;
a gas sensor adapted to detect a combustible gas, said gas sensor being disposed in said sensor chamber to detect a density of a particular ingredient of said combustible gas contained in an exhaust gas exhausted from a cylinder of said engine, and to output a detection signal to a control unit; and
means for damping vibration, wherein said means for damping vibration is adapted to support at least one of said gas sensor unit or said combustible gas sensor disposed in said gas sensor unit, such that said gas sensor unit or said combustible gas sensor is movable by an amount equal to or less than a predetermined extent of movement of said engine, thereby to reduce vibration from said engine from transmitting directly to said gas sensor unit or said combustible gas sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An engine comprising a gas sensor unit for an engine, said gas sensor unit comprising:
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a sensor chamber of said unit;
a gas sensor adapted to detect a combustible gas, said gas sensor being disposed in said sensor chamber to detect a density of a particular ingredient of said combustible gas contained in an exhaust gas exhausted from a cylinder of said engine, and to output a detection signal to a control unit; and
means for damping vibration, wherein said means for damping vibration is adapted to support at least one of said gas sensor unit or said combustible gas sensor disposed in said gas sensor unit, such that said gas sensor unit or said combustible gas sensor is movable by an amount equal to or less than a predetermined extent of movement of said engine, thereby to reduce vibration from said engine from transmitting directly to said gas sensor unit or said combustible gas sensor.
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20. The engine of claim 20, wherein said gas sensor unit is fixedly attached to and integral with a carburetor of said engine and wherein an exhaust gas return passageway adapted to return to said carburetor, at least a portion of said exhaust gas introduced into said sensor chamber.
Specification