EGR system
First Claim
1. A recirculation system for an internal combustion engine comprising:
- an actuatable valve;
a first tube connected to the valve and to an exhaust mechanism of the internal combustion engine;
a second tube connected to the valve and to an intake mechanism of the engine;
a first pressure sensor situated in the first tube and connected to the valve, the first pressure sensor configured to sense pulses in exhaust pressure;
a second pressure sensor situated in the second tube and connected to the valve; and
a controller, the controller configured to control a flow area, time of opening and time of closing of the valve.
1 Assignment
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Accused Products
Abstract
A flow control mechanism connected to the intake and exhaust systems of an engine. The mechanism may achieve recirculation of exhaust gases despite varying differential pressures or delta pressures between the systems, particularly since intake pressures may often exceed exhaust pressures. Pressure sensors may be situated proximate to the input and output of the flow control mechanism. There may a flow sensor proximate to the flow control mechanism. Cylinder pressure or pulse sensors may be situated in or about the engine. A processor may be connected to various sensors and provide prompt active control of a valve or like device in the flow control mechanism. Such valve may operate sufficiently quickly so as to prevent backflow from the intake system into the exhaust system upon sudden pressure changes in the systems. The quickness of the active valve control may also permit recirculating stipulated amounts of exhaust gas to each cylinder.
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Citations
9 Claims
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1. A recirculation system for an internal combustion engine comprising:
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an actuatable valve; a first tube connected to the valve and to an exhaust mechanism of the internal combustion engine; a second tube connected to the valve and to an intake mechanism of the engine; a first pressure sensor situated in the first tube and connected to the valve, the first pressure sensor configured to sense pulses in exhaust pressure; a second pressure sensor situated in the second tube and connected to the valve; and a controller, the controller configured to control a flow area, time of opening and time of closing of the valve. - View Dependent Claims (2, 3)
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4. A recirculation system comprising:
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an electrically actuated valve having an adjustable window with a flow area, a time of opening, and a time of closing; a first tube connected to the valve; a second tube connected to the valve; a first pressure sensor situated in the first tube; a second pressure sensor situated in the second tube; and a controller connected to the valve, the first sensor and the second sensor, the controller configured to open the valve window only when a first pressure sensed by the first pressure sensor exceeds a second pressure sensed by the second pressure sensor. - View Dependent Claims (5, 6, 7, 8)
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9. A recirculation system for an internal combustion engine comprising:
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a valve; a first tube connected to the valve and to an exhaust mechanism of the engine; a second tube connected to the valve and to an intake mechanism of the engine; a mechanism, connected to the valve, for sensing pressure pulses in the first tube; and a controller connected to the valve and to the mechanism, the controller configured to adjust an opening time and a closing time of the valve for each pressure pulse.
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Specification