Exhaust restriction device for improved sensor signal
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Raymond Host
Life of this patent
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Abstract
An engine exhaust system includes a catalytic converter, an exhaust conduit connected upstream of the catalytic converter, and an oxygen sensor extending into the exhaust conduit at a first axial position of the exhaust conduit. A valve is located within the exhaust conduit at the first axial position. The valve includes a movable throttle plate having a bypass notch formed on a periphery of the plate. The valve has an open position, and a closed position in which the bypass notch is placed adjacent to the oxygen sensor to guide exhaust over the oxygen sensor.
Claims16
An engine exhaust system comprising:
- a catalytic converter;
- an exhaust conduit connected upstream of the catalytic converter;
- an oxygen sensor extending into the exhaust conduit at a first axial position of the exhaust conduit;
- and
- a valve located within the exhaust conduit at the first axial position, the valve including a movable throttle plate having a bypass notch formed on a periphery of the plate, wherein the valve includes an open position and a closed position in which the bypass notch is placed adjacent to the oxygen sensor to guide exhaust over the oxygen sensor.
An engine exhaust system comprising:
- an exhaust manifold defining a sensor opening;
- an oxygen sensor received in the sensor opening;
- and
- a valve located within the exhaust manifold at a location corresponding to the sensor opening, the valve including a plate which pivots between an open position and a closed position in which an effective cross-sectional area of the exhaust manifold is reduced to concentrate exhaust flow over the oxygen sensor, the plate defining a notch that cooperates with the exhaust manifold to define the effective cross-sectional area.
Dependencies are inferred from the claim text.