Abstract:
An EGR condensate drain mechanism is disclosed having an engine exhaust system for directing an exhaust stream from an engine through a conduit and then into an exhaust cooler where water vapor is condensed, pooled and systematically drained from the cooler to prevent freezing. The cooler includes a sidewall to define a chamber and a drain means within the sidewall for removing the condensate from a pooling area in the chamber. The drain means includes a fluid port positioned within the sidewall of the exhaust cooler proximate the pooling area, a drain line attached to the fluid port, and a one-way valve located in one of either the fluid port or the drain line. The opening and closing of the one-way valve is typically responsive to the amount of condensate collected in the pooling area. Other parameters may be used to control the valve as well.
Abstract:
A heat exchanger having a modified header design for absorbing high thermal loads, is described. The heat exchanger includes housing, core including a plurality of tubes providing flow passages within the housing and header plate positioned at an end of the housing and connected to the core. The header plate and flow passages join forming a thermal deflecting junction. In addition, a header for use with an exhaust gas heat exchanger, is disclosed. The header includes a header plate having a planer base wall and a flange extending from the base wall for receiving an end of at least one exhaust gas tube, a heat deflecting junction where the header plate meets the end of the tube. The header also includes a joint formed from the flange connecting to the tube, and positioned a suitable distance from the heat deflecting junction.
Abstract:
An engine exhaust system includes a turbocharger turbine with an undivided inlet. The engine includes two exhaust pipes, each exhaust pipe receives an exhaust gas portion from a group of cylinders. The exhaust pipes terminate at a common connection face and are in communication with the undivided inlet of the turbine when the connection face is connected to the turbine housing. A divider extends outward from the connection face with a base end located between the exhaust pipes, the divider adapted in shape to fit within the undivided inlet of the turbine.
Abstract:
An engine braking system includes a butterfly valve located in the exhaust system upstream of a partial admission engine turbocharger. A bypass exhaust gas passage is used to supply exhaust gas to the turbine when the flap valve is in the closed position. By using a backpressure butterfly valve located upstream of the turbocharger, the valve can be closed completely to generate high levels of backpressure. By using the external bypass exhaust gas supply to the turbine housing, the turbine continues to spin, the engine mass flow is not choked off, and improved brake performance will result.
Abstract:
An engine controller causes a propulsion engine of a motor vehicle to be fueled in a fueling mode of operation and not to be fueled in a non-fueling mode of operation. A controlled device, such as a clutch or regulator, controls operation of a pneumatic compressor which forces compressed air into a storage tank. The controlled device is controlled according to a strategy which distinguishes between the fueling mode and the non-fueling mode for improving overall vehicle fuel economy.
Abstract:
A heat exchanger having a modified header design for absorbing high thermal loads, is described. The heat exchanger includes a housing having an interior space, a core within the interior space of the housing, the core comprising a plurality of flow passages, and a header positioned at an end of the housing and in communication with the core, wherein the header includes a thermal absorbing formation. The thermal absorbing formation may take the form of a continuous raised rib around an inner circumference of the header. The raised rib absorbs excess heat and reduces thermal strain on the heat exchanger.
Abstract:
While an engine is running with all engine cylinders being fueled, a historical record of engine output torque and engine speed is compiled. When the historical record discloses a change in engine operation from a relatively greater output torque and engine speed to a relatively lesser output torque and speed, fueling of at least one engine cylinder ceases while engine output torque and engine speed remain substantially unchanged at the relatively lesser output torque and speed by continuing fueling of other engine cylinders and by causing at least one mechanism to control the timing of operation of cylinder intake and exhaust valves of the at least one engine cylinder to substantially minimize pumping loss attributable to the at least one engine cylinder.
Abstract:
When the difference by which pressure in an engine exhaust manifold exceeds pressure in an engine intake manifold becomes less than a selected difference while an intake valve operating mechanism is closing cylinder intake valves at a selected time in the engine cycle, while an EGR system is conveying the engine exhaust component of an air/exhaust mixture from an exhaust system to an intake system, and a certain quantity of NOx is present in engine exhaust entering the exhaust manifold, the quantity of NOx present in engine exhaust entering the exhaust manifold is reduced below that certain quantity by causing the intake valve operating mechanism to close the cylinder intake valves earlier in the engine cycle than the selected time.
Abstract:
A turbine (22T) of a turbocharger (22) has a housing (24), a turbine wheel (30) disposed within an interior of the housing on a shaft (32) for rotation with the shaft about an axis of rotation (34). A scroll (38) directs a gas toward the axis for imparting rotation to the turbine wheel and shaft. A ring (44) is concentric with the axis and is selectively positionable along the axis for selectively restricting gas directed from the scroll toward the axis. A mechanism (48), including a first-class lever (86) pivotally mounted on the housing, positions the ring along the axis.
Abstract:
In response to activation of a compression release brake when a motor vehicle having a turbocharged internal combustion engine is operating at some elevation above sea level and a turbocharger compressor is operating in a region of an operating map which is creating boost air in an engine intake manifold which would cause the compression release brake to decelerate the vehicle more slowly at that elevation than it would at sea level for the same operating conditions of the vehicle and engine other than altitude, the compression release brake decelerates the vehicle less slowly by causing an exhaust gas recirculation system to reduce at least one of a) mass of exhaust diverted to an intake system of the engine and b) cooling of the diverted exhaust.