公开(公告)号：US06934621B2

公开(公告)日：2005-08-23

申请号：US10627520

申请日：2003-07-25

Applicant: Sameer Bhargava ,  Ravishankar Ramamurthy ,  Brian A. Lewallen

Inventor： Sameer Bhargava ,  Ravishankar Ramamurthy ,  Brian A. Lewallen

IPC: F02D21/08 ,  F02D23/00 ,  F02D41/00 ,  F02M25/07 ,  B60T7/12

CPC classification number: F02D41/005 ,  F02D41/0007 ,  F02D2200/0406 ,  F02D2200/0408 ,  F02D2200/0414 ,  F02M26/25 ,  F02M26/47 ,  Y02T10/144 ,  Y02T10/47

Abstract: A control for an internal combustion engine that includes an exhaust gas recirculation system predicts at least one of the intake manifold temperature in EGR mode or an intake manifold pressure in EGR mode, but preferably both, during Boost mode operation. The predictions are relied upon to calculate an intake manifold critical temperate in EGR, at which condensation would occur. The control then compares the predicted temperate value with the calculated intake manifold critical temperature, and if the predicted value exceeds the calculated temperature, the control commands re-entry into exhaust gas recirculation mode.

Abstract translation: 包括排气再循环系统的内燃机的控制装置在升压模式运行期间预测EGR模式中的进气歧管温度或EGR模式中的进气歧管压力中的至少一个，但优选两者。 依靠这些预测来计算在发生冷凝的EGR中的进气歧管临界温度。 然后，控制将预测的温度值与计算的进气歧管临界温度进行比较，如果预测值超过计算出的温度，则控制命令重新进入废气再循环模式。

公开(公告)号：US06681171B2

公开(公告)日：2004-01-20

申请号：US10023020

申请日：2001-12-18

Applicant: Phillip F. Rimnac ,  Ravishankar Ramamurthy ,  Sameer Bhargava

Inventor： Phillip F. Rimnac ,  Ravishankar Ramamurthy ,  Sameer Bhargava

IPC: F02M2507

CPC classification number: F02D41/005 ,  F01P2060/02 ,  F02B29/0418 ,  F02B29/0425 ,  F02B29/0493 ,  F02B37/24 ,  F02D2200/0406 ,  F02D2200/0414 ,  F02D2200/0418 ,  F02M26/05 ,  F02M26/10 ,  F02M26/16 ,  F02M26/25 ,  F02M26/28 ,  F02M26/47 ,  Y02T10/146 ,  Y02T10/47

Abstract: A system and method for controlling an internal combustion engine to reduce or eliminate formation of EGR condensate monitor current ambient and operating conditions to determine whether conditions are favorable for condensation of EGR gases, and control the engine accordingly to avoid condensation, preferably by increasing the intake manifold temperature. The intake manifold temperature may be increased by redirecting some or all of the EGR flow to avoid the EGR cooler. Alternatively, or in combination, some or all of the charge air may be redirected to bypass the charge air cooler and/or redirected from the outlet of the turbocharger compressor to the intake, effectively increasing the intake air temperature and resulting in a corresponding increase of the intake manifold temperature. Conditions favorable for condensation may be determined based on engine speed and load, ambient temperature, manifold pressure, scheduled or actual EGR flow rate and scheduled or actual air/fuel ratio.

Abstract translation: 用于控制内燃机以减少或消除形成EGR冷凝物的系统和方法监测当前环境和操作条件以确定条件是否有利于EGR气体的冷凝，并且相应地控制发动机以避免冷凝，优选地通过增加进气 歧管温度。 进气歧管温度可以通过重定向一些或所有EGR流来避免EGR冷却器而增加。 或者或组合地，一些或所有增压空气可以被重定向以绕过增压空气冷却器和/或从涡轮增压器压缩机的出口重新定向到进气口，有效地增加进气温度并导致相应增加 进气歧管温度。 有利于冷凝的条件可以根据发动机转速和负荷，环境温度，歧管压力，调度或实际EGR流量以及计划或实际空气/燃料比来确定。

公开(公告)号：US08931265B2

公开(公告)日：2015-01-13

申请号：US13468089

申请日：2012-05-10

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F01N3/00 ,  F01N3/10 ,  F01N3/02 ,  F01N3/20

CPC classification number: F01N3/2066 ,  F01N9/00 ,  F01N2900/1404 ,  F01N2900/1602 ,  F02D41/0245 ,  F02D41/0255 ,  F02D41/1441 ,  F02D41/1446 ,  F02D41/401 ,  F02D41/405 ,  F02D2200/0804 ,  Y02T10/24 ,  Y02T10/26 ,  Y02T10/47

Abstract: An exhaust aftertreatment system for a diesel engine includes a selective catalytic reduction (SCR) device and a diesel oxidation catalyst upstream of the SCR device. A method for warming-up the SCR device includes monitoring a plurality of combustion input parameters during an SCR warm-up strategy, monitoring a first temperature and a second temperature within the aftertreatment system, providing a feedback adjustment term as a function of a deviation in the first temperature from a desired temperature only when the monitored first and second temperatures are within a predetermined adjustment range, and initiating an adjusted SCR warm-up strategy based on the feedback adjustment term to converge the first temperature toward the desired temperature.

Abstract translation: 用于柴油发动机的排气后处理系统包括SCR装置上游的选择性催化还原（SCR）装置和柴油氧化催化剂。 一种用于预热SCR装置的方法包括在SCR预热策略期间监测多个燃烧输入参数，监测后处理系统中的第一温度和第二温度，提供作为偏差的函数的反馈调整项 只有当所监测的第一和第二温度在预定的调节范围内时，从所需温度起第一温度，以及基于反馈调整项启动调整后的SCR预热策略，以使第一温度朝向期望的温度收敛。

公开(公告)号：US20130298528A1

公开(公告)日：2013-11-14

申请号：US13468089

申请日：2012-05-10

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F01N3/20

CPC classification number: F01N3/2066 ,  F01N9/00 ,  F01N2900/1404 ,  F01N2900/1602 ,  F02D41/0245 ,  F02D41/0255 ,  F02D41/1441 ,  F02D41/1446 ,  F02D41/401 ,  F02D41/405 ,  F02D2200/0804 ,  Y02T10/24 ,  Y02T10/26 ,  Y02T10/47

Abstract: An exhaust aftertreatment system for a diesel engine includes a selective catalytic reduction (SCR) device and a diesel oxidation catalyst upstream of the SCR device. A method for warming-up the SCR device includes monitoring a plurality of combustion input parameters during an SCR warm-up strategy, monitoring a first temperature and a second temperature within the aftertreatment system, providing a feedback adjustment term as a function of a deviation in the first temperature from a desired temperature only when the monitored first and second temperatures are within a predetermined adjustment range, and initiating an adjusted SCR warm-up strategy based on the feedback adjustment term to converge the first temperature toward the desired temperature.

Abstract translation: 用于柴油发动机的排气后处理系统包括SCR装置上游的选择性催化还原（SCR）装置和柴油氧化催化剂。 一种用于预热SCR装置的方法包括在SCR预热策略期间监测多个燃烧输入参数，监测后处理系统中的第一温度和第二温度，提供作为偏差的函数的反馈调整项 只有当所监测的第一和第二温度在预定的调节范围内时，从所需温度起第一温度，以及基于反馈调整项启动调整后的SCR预热策略，以使第一温度朝向期望的温度收敛。

公开(公告)号：US20100250518A1

公开(公告)日：2010-09-30

申请号：US12413544

申请日：2009-03-28

Applicant: Nicolas Bruno ,  Ravishankar Ramamurthy ,  Surajit Chaudhuri

Inventor： Nicolas Bruno ,  Ravishankar Ramamurthy ,  Surajit Chaudhuri

IPC: G06F17/30

CPC classification number: G06F17/30386

Abstract: A flexible query hints system and method for discovering and expressing query hints in a database management system. Embodiments of the flexible query hints system and method include a power hints (Phints) language that enables the specification of constraints to influence a query optimizer. Phints expressions are defined as tree patterns annotated with constraints. Embodiments of the flexible query hints system and method also include techniques to incorporate the power hints language expressions into an extended query optimizer. Theses techniques include computing a directed acyclic graph for Phints expression, deriving candidate matches using the Phints expression and the graph, computing candidate matches, and extracting a revised execution plan having a lowest cost and satisfying constraints of the Phints expression. Embodiments of the flexible query hints system and method include a flexible query hint user interface that allow users to interactively adjust query hints.

Abstract translation: 灵活的查询提示系统和方法，用于在数据库管理系统中发现和表达查询提示。 灵活查询提示系统和方法的实施例包括能够指定约束来影响查询优化器的功率提示（Phints）语言。 Phints表达式定义为使用约束注释的树模式。 灵活查询提示系统和方法的实施例还包括将功能提示语言表达式并入到扩展查询优化器中的技术。 这些技术包括计算用于Phints表达的有向非循环图，使用Phints表达式和图形导出候选匹配，计算候选匹配，以及提取具有最低成本并满足Phints表达式的约束的经修订的执行计划。 灵活查询提示系统和方法的实施例包括灵活的查询提示用户界面，允许用户交互地调整查询提示。

公开(公告)号：US20100235347A1

公开(公告)日：2010-09-16

申请号：US12404284

申请日：2009-03-14

Applicant: Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

Inventor： Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

IPC: G06F17/30

CPC classification number: G06F17/30463

Abstract: An exact cardinality query optimization system and method for optimizing a query having a plurality of expressions to obtain a cardinality-optimal query execution plan for the query. Embodiments of the system and method use various techniques to shorten the time necessary to obtain the cardinality-optimal query execution plan, which contains the query execution plan when all cardinalities are exact. Embodiments of the system and method include a covering queries technique that leverages query execution feedback to obtain an unordered subset of relevant expressions for the query, an early termination technique that bounds the cardinality to determine whether the processing can be terminate before each of the expressions are executed, and an expressions ordering technique that finds an ordering of expressions that yields the greatest reduction in time to obtain the cardinality-optimal query execution plan.

Abstract translation: 一种精确的基数查询优化系统和方法，用于优化具有多个表达式的查询，以获得查询的基数最优查询执行计划。 系统和方法的实施例使用各种技术来缩短获得基数优化查询执行计划所需的时间，当所有基数是精确的时，其包含查询执行计划。 该系统和方法的实施例包括利用查询执行反馈来获取查询的相关表达式的无序子集的覆盖查询技术，限制基数以确定处理是否可以在每个表达式之前终止的提前终止技术是 以及表达式排序技术，其找到产生最大时间缩短以获得基数优化查询执行计划的表达式的排序。

公开(公告)号：US07637107B2

公开(公告)日：2009-12-29

申请号：US11459382

申请日：2006-07-24

Applicant: Ravishankar Ramamurthy

Inventor： Ravishankar Ramamurthy

IPC: F02B33/44

CPC classification number: F02B37/24 ,  F01N3/021 ,  F01N9/00 ,  F01N2260/06 ,  F02B3/06 ,  F02D23/02 ,  F02D41/005 ,  F02M26/05 ,  F02M26/16 ,  F02M26/23 ,  Y02T10/144 ,  Y02T10/20 ,  Y02T10/47

Abstract: A control system and method that compensates for changes in backpressure of an engine includes a pressure sensor that senses the backpressure. A boost compensation module that communicates with the pressure sensor, determines an averaged BC factor, and adjusts a variable geometry turbo based on the averaged BC factor.

Abstract translation: 补偿发动机背压变化的控制系统和方法包括感测背压的压力传感器。 与压力传感器通信的升压补偿模块确定平均BC因子，并根据平均BC因子调整可变几何涡轮增压。

公开(公告)号：US20060288701A1

公开(公告)日：2006-12-28

申请号：US11076718

申请日：2005-03-10

Applicant: Ravishankar Ramamurthy ,  Laurentiu Vaduva ,  Admir Kreso

Inventor： Ravishankar Ramamurthy ,  Laurentiu Vaduva ,  Admir Kreso

IPC: F02D23/00 ,  F02B33/44

CPC classification number: F02D41/0007 ,  F02B29/0493 ,  F02B37/22 ,  F02D23/00 ,  F02D41/005 ,  F02D41/1448 ,  F02D41/18 ,  F02M26/15 ,  F02M26/33 ,  F02M26/47 ,  Y02T10/144 ,  Y02T10/47

Abstract: A method for controlling exhaust gas particulate emissions from a compression ignition internal combustion engine having a variable geometry turbocharger (VGT) includes the steps of determining backpressure across the engine and air mass flow into the engine, closing vanes of the VGT to provide air mass flow increase when backpressure is increasing, and stopping the step of closing the vanes of the VGT when a decrease in rate of change of air mass flow is determined.

Abstract translation: 用于控制具有可变几何形状涡轮增压器（VGT）的压缩点火式内燃机的废气颗粒物排放的方法包括以下步骤：确定跨过发动机的空气质量流量和进入发动机的空气质量流量，关闭VGT的叶片以提供空气质量流量 当空气质量流量的变化率降低确定时，反压增加时增加，并停止关闭VGT的叶片的步骤。

公开(公告)号：US20060282404A1

公开(公告)日：2006-12-14

申请号：US11149968

申请日：2005-06-10

Applicant: Surajit Chaudhuri ,  Ravishankar Ramamurthy ,  Kaushik Shriraghav

Inventor： Surajit Chaudhuri ,  Ravishankar Ramamurthy ,  Kaushik Shriraghav

IPC: G06F17/30

CPC classification number: G06F17/30522 ,  G06F17/30474 ,  Y10S707/99932 ,  Y10S707/99933 ,  Y10S707/99934 ,  Y10S707/99935

Abstract: Techniques for estimating the progress of database queries are described herein. In a first implementation, a respective lower-bound parameter is associated with each node in an operator tree that representing a given database query, and the progress of the database query at a given point is estimated based upon the lower-bound parameters. In a second implementation, the progress of the query is estimated by associating respective lower-bound and upper-bound parameters with each node in the operator tree. The progress of the query at the given point is then estimated based on the lower-bound and upper-bound parameters. The progress estimate is computed by dividing the work done so far by the sums of the above averages for each node in the tree.

Abstract translation: 本文描述了用于估计数据库查询的进度的技术。 在第一实现中，相应的下限参数与表示给定数据库查询的运算符树中的每个节点相关联，并且基于下限参数来估计给定点处的数据库查询的进度。 在第二个实现中，通过将相应的下限和上限参数与运算符树中的每个节点相关联来估计查询的进度。 然后，基于下限和上限参数估计给定点处的查询进度。 进度估计是通过将迄今为止完成的工作除以树中每个节点的上述平均值的总和来计算的。

公开(公告)号：US20110295833A1

公开(公告)日：2011-12-01

申请号：US12789486

申请日：2010-05-28

Applicant: Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

Inventor： Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

IPC: G06F17/30

CPC classification number: G06F17/30448 ,  G06F11/3664 ,  G06F11/3676

Abstract: Described is a test framework for testing transformation rules of query optimizers. Rule patterns obtained as tree structures from a query optimizer are used to generate queries that are used to test the rule optimizer's transformation rules. The test framework tracks which rules are exercised for each query, and also determines the correctness of the transformation rule by comparing the results of the query processing with the rule and without the rule (by turning off the rule). The test framework creates a composite pattern corresponding to two or more rules, such as to test rules in a set (e.g., as pairs). Also described is the efficient execution of a test suite for correctness testing, in which queries of the test suite are selected based upon cost information.

Abstract translation: 描述了用于测试查询优化器的转换规则的测试框架。 使用从查询优化器获取的树结构的规则模式用于生成用于测试规则优化器转换规则的查询。 测试框架跟踪每个查询执行哪些规则，并且通过将查询处理的结果与规则进行比较，并且通过将规则（通过关闭规则）进行比较来确定变换规则的正确性。 测试框架创建一个对应于两个或多个规则的复合模式，例如测试集合中的规则（例如，成对）。 还描述了用于正确性测试的测试套件的有效执行，其中基于成本信息来选择测试套件的查询。