Patent Application
20180216580
The present disclosure relates to a long route exhaust gas recirculation cooler arrangement with bypass.
This section provides background information related to the present disclosure which is not necessarily prior art.
If the coolant temperature in the cooler of a long route EGR system falls below the dew point, condensation can happen, which can affect the compressor wheel.
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
The present disclosure provides an improved long route EGR cooler arrangement to allow operation at lower coolant temperatures. The present disclosure further provides a direct path bypass pipe to allow a fast warm-up and guarantee the lowest possible pressure drop. The EGR cooler is V-shaped and may include one or two cooler matrices for compact packaging around the bypass pipe. An intermediate section of the V-shaped cooler is designed to collect condensates and is in contact with an end section of the aftertreatment system to promote evaporation and warm-up of the cooler. A flow blending valve is provided to modulate the EGR flow and blend the bypassed and cooled exhaust flow portions.
Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not to be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
With reference to
An exhaust gas recirculation (EGR) system 30 is connected between an aftertreatment system 32 of the exhaust system 18 and the intake system 16. The EGR system 30 includes an EGR cooler 34 that has a V-shape, as best shown in
With continued reference to
As best shown in
With reference to
The system of the present disclosure provides an innovative layout with a dual matrix EGR cooler 34 for compact packaging around the bypass pipe 46 and flexible coolant feeding. The vertically lower intermediate section 40 is designed to collect condensates and is in metal contact with the aftertreatment system 32 to promote evaporation of condensates and cooler warm-up. The flow blending valve 60 is provided to modulate the EGR flow and blend the bypassed and cooled exhaust gas portions. The system provides for the possible usage of the bypass at low loads when the long route EGR system may be limited by throttling wherein the bypass pipe 46 is designed as a lower-pressure-drop path compared to the cooled path. The bypass pipe 46 is also used to operate the EGR cooler at low temperatures.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
