公开(公告)号：US06725848B2

公开(公告)日：2004-04-27

申请号：US10052013

申请日：2002-01-18

申请人： Ravishankar Ramamurthy ,  Sameer Bhargara ,  Phillip F. Rimnac

发明人： Ravishankar Ramamurthy ,  Sameer Bhargara ,  Phillip F. Rimnac

IPC分类号： F02M2507

CPC分类号： F02D41/005 ,  F02B29/0425 ,  F02D2200/0418 ,  F02M26/05 ,  F02M26/10 ,  F02M26/16 ,  F02M26/28 ,  F02M26/33 ,  F02M26/47 ,  F02M26/50 ,  Y02T10/47

摘要： An exhaust gas recirculation system for a compression ignition engine is provided wherein the exhaust gas recirculation is shut off depending upon the sensed or calculated humidity in the intake manifold relative to the dew point of the exhaust/intake air mixture. The humidity of the exhaust/intake air mixture may be measured in the intake manifold, charge air mixer or the ambient humidity may be sensed. If humidity is measured in the air charge mixer or in the ambient air, other factors such as engine speed and load, intake manifold pressure, EGR flow and air/fuel ratio may be used to calculate the humidity in the intake manifold. When the temperature of the mixture in the intake manifold is less than the dew point of the mixture, the engine control strategy may be shut off the EGR to prevent condensation in the exhaust gas recirculation system or engine.

摘要翻译： 提供了一种用于压缩点火发动机的废气再循环系统，其中废气再循环根据进气歧管中感测或计算的湿度相对于排气/进气混合物的露点而被切断。 排气/进气混合物的湿度可以在进气歧管中测量，可以感测加气空气混合器或环境湿度。 如果在空气充气混合器或环境空气中测量湿度，则可以使用诸如发动机转速和负载，进气歧管压力，EGR流量和空气/燃料比等其他因素来计算进气歧管中的湿度。 当进气歧管中的混合物的温度低于混合物的露点时，发动机控制策略可以关闭EGR以防止废气再循环系统或发动机中的冷凝。

公开(公告)号：US06681171B2

公开(公告)日：2004-01-20

申请号：US10023020

申请日：2001-12-18

申请人： Phillip F. Rimnac ,  Ravishankar Ramamurthy ,  Sameer Bhargava

发明人： Phillip F. Rimnac ,  Ravishankar Ramamurthy ,  Sameer Bhargava

IPC分类号： F02M2507

CPC分类号： 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

摘要： 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.

摘要翻译： 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：US20110295833A1

公开(公告)日：2011-12-01

申请号：US12789486

申请日：2010-05-28

申请人： Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

发明人： Vivek R. Narasayya ,  Ravishankar Ramamurthy ,  Hicham G. Elmongui

IPC分类号： G06F17/30

CPC分类号： G06F17/30448 ,  G06F11/3664 ,  G06F11/3676

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20090183508A1

公开(公告)日：2009-07-23

申请号：US12043211

申请日：2008-03-06

申请人： Ravishankar Ramamurthy

发明人： Ravishankar Ramamurthy

IPC分类号： F02B33/34 ,  F02M63/00

CPC分类号： F02D41/0007 ,  F01N9/002 ,  F02B39/16 ,  F02D41/029 ,  F02D41/1448 ,  F02D41/221 ,  F02D2200/703 ,  F02D2250/26 ,  Y02T10/144 ,  Y02T10/40

摘要： A turbocharger protection system for an engine system that includes a particulate filter and a turbocharger comprises a delta pressure estimator that estimates a pressure difference in a particulate filter. A pressure factor estimator module estimates a pressure factor based on the difference and barometric pressure. A fuel limit estimator module protects the turbocharger by selectively limiting fuel injection to the engine based on the pressure factor.

摘要翻译： 一种用于包括微粒过滤器和涡轮增压器的发动机系统的涡轮增压器保护系统包括估计微粒过滤器中的压力差的δ压力估计器。 压力因子估计器模块基于差异和大气压力估计压力因子。 燃料极限估计器模块通过基于压力因子选择性地限制对发动机的燃料喷射来保护涡轮增压器。

公开(公告)号：US07493337B2

公开(公告)日：2009-02-17

申请号：US10813963

申请日：2004-03-31

申请人： Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

发明人： Surajit Chaudhuri ,  Vivek Narasayya ,  Ravishankar Ramamurthy

IPC分类号： G06F7/00 ,  G06F17/00 ,  G06F17/30

CPC分类号： G06F17/30522 ,  G06F17/30306 ,  Y10S707/99932 ,  Y10S707/99945 ,  Y10S707/99948

摘要： A query progress indicator that provides an indication to a user of the progress of a query being executed on a database. The indication of the progress of the query allows the user to decide whether the query should be allowed to complete or should be aborted. One method that may be used to estimate the progress of a query that is being executed on a database defines a model of work performed during execution of a query. The total amount of work that will be performed during execution of the query is estimated according to the model. The amount of work performed at a given point during execution of the query is estimated according to the model. The progress of the query is estimated using the estimated amount of work at the given point in time and the estimated total amount of work. This estimated progress of query execution may be provided to the user.

摘要翻译： 查询进度指示符，向用户提供在数据库上执行的查询的进度的指示。 查询进度的指示允许用户决定是否允许查询完成或应该被中止。 可用于估计在数据库上执行的查询的进度的一种方法定义了在查询执行过程中执行的工作模型。 根据模型估计执行查询期间执行的总工作量。 在执行查询期间在给定点执行的工作量根据模型进行估计。 查询的进度使用在给定时间点的估计工作量和估计的总工作量来估计。 可以向用户提供该估计的查询执行进度。

公开(公告)号：US20080071785A1

公开(公告)日：2008-03-20

申请号：US11468928

申请日：2006-08-31

申请人： Govind Kabra ,  Ravishankar Ramamurthy ,  Sundararajarao Sudarshan

发明人： Govind Kabra ,  Ravishankar Ramamurthy ,  Sundararajarao Sudarshan

IPC分类号： G06F17/30

CPC分类号： G06F17/30471 ,  G06F17/30306 ,  G06F21/6227

摘要： Fine-grained access control for querying a database with low overhead and safety plans. In a view placement approach, base relations of the query expression are replaced by views that are appropriate for the particular user. Information leakage via UDF pushing, exception processing, and error messages can be prevented by generating safe plans. An existing query optimizer can be modified to perform redundancy removal and safe plan implementation. Subsumption testing available in materialized view matching can be exploited by the query optimizer. Authorization inference is exploited to generate safe plans.

摘要翻译： 用于以低开销和安全计划查询数据库的细粒度访问控制。 在视图放置方法中，查询表达式的基础关系被替换为适合特定用户的视图。 可以通过生成安全计划来防止通过UDF推送，异常处理和错误消息的信息泄漏。 可以修改现有的查询优化器，以执行冗余删除和安全计划实施。 查询优化器可以利用实体​​化视图匹配中的可用度量测试。 利用授权推理来制定安全计划。

公开(公告)号：US20080016865A1

公开(公告)日：2008-01-24

申请号：US11459382

申请日：2006-07-24

申请人： Ravishankar Ramamurthy

发明人： Ravishankar Ramamurthy

IPC分类号： F01N5/04 ,  F01N3/00 ,  F02D23/00 ,  F02B33/44

CPC分类号： 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

摘要： 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.

摘要翻译： 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：US08108154B2

公开(公告)日：2012-01-31

申请号：US12331884

申请日：2008-12-10

申请人： Ravishankar Ramamurthy ,  Shouxian Ren

发明人： Ravishankar Ramamurthy ,  Shouxian Ren

IPC分类号： G06N31/00 ,  F01N3/00

CPC分类号： F01N9/00 ,  F01N3/2066 ,  F01N2900/0601 ,  F01N2900/08 ,  F01N2900/12 ,  F01N2900/1402 ,  Y02A50/2325 ,  Y02T10/24 ,  Y02T10/47

摘要： A NOx estimation system includes an operating mode determination module that determines an operating mode of an engine, and an emission prediction module. The emission prediction module estimates NOx emission based on the operating mode, a plurality of sensed parameters, and a map. The map correlates the plurality of sensed parameters to the NOx emission based on the operating mode.

摘要翻译： NOx估计系统包括确定发动机的运行模式的运行模式确定模块和排放预测模块。 排放预测模块基于操作模式，多个感测参数和地图来估计NOx排放。 该地图基于操作模式将多个感测参数与NOx排放相关联。

公开(公告)号：US07739269B2

公开(公告)日：2010-06-15

申请号：US11625153

申请日：2007-01-19

申请人： Surajit Chaudhuri ,  Ravishankar Ramamurthy

发明人： Surajit Chaudhuri ,  Ravishankar Ramamurthy

IPC分类号： G06F7/00 ,  G06F17/30

CPC分类号： G06F17/30463

摘要： Database systems use a plan cache to avoid the overheads (e.g., time, money) of query recompilation. Query plans can become invalidated by updates to the statistics on data or changes to the physical database design. Once a plan is invalidated, it can be repaired utilizing one or more of the disclosed embodiments. Incremental repair of query plans includes reusing parts of the current plan rather than discarding the plan entirely when it is invalidated. Repair to an existing query plan is attempted before resorting to full recompilation.

摘要翻译： 数据库系统使用计划缓存来避免查询重新编译的开销（如时间，金钱）。 通过对数据统计信息的更新或物理数据库设计更改，查询计划可能会失效。 一旦计划无效，可以利用所公开的一个或多个实施例来修复计划。 查询计划的增量修复包括重新使用当前计划的部分，而不是完全在无效的情况下丢弃计划。 在进行完全重新编译之前尝试修复现有的查询计划。

公开(公告)号：US20090083238A1

公开(公告)日：2009-03-26

申请号：US11859046

申请日：2007-09-21

申请人： Surajit Chaudhuri ,  Shriraghav Kaushik ,  Abhijit Pol ,  Ravishankar Ramamurthy

发明人： Surajit Chaudhuri ,  Shriraghav Kaushik ,  Abhijit Pol ,  Ravishankar Ramamurthy

IPC分类号： G06F17/30

CPC分类号： G06F16/24561

摘要： Stop-and-restart query execution that partially leverages the work already performed during the initial execution of the query to reduce the execution time during a restart. The technique selectively saves information from a previous execution of the query so that the overhead associated with restarting the query execution can be bounded. Despite saving only limited information, the disclosed technique substantially reduces the running time of the restarted query. The stop-and-restart query execution technique is constrained to save and reuse only a bounded number of records (intermediate records or output records) thereby releasing all other resources, rather than some of the resources. The technique chooses a subset of the records to save that were found during normal execution and then skipping the corresponding records when performing a scan during restart to prevent the duplication of execution. A skip-scan operator is employed to facilitate the disclosed restart technique.

摘要翻译： 停止和重新启动的查询执行，部分利用在初始执行查询期间已经执行的工作，以减少重新启动期间的执行时间。 该技术选择性地保存来自查询的先前执行的信息，使得与重新启动查询执行相关联的开销可以被界定。 尽管仅节省有限的信息，但是所公开的技术大大减少了重新启动的查询的运行时间。 停止和重启查询执行技术被限制为只保存和重用有限数量的记录（中间记录或输出记录），从而释放所有其他资源，而不是一些资源。 该技术选择在正常执行期间发现的记录的子集，然后在重新启动期间执行扫描时跳过相应的记录，以防止重复执行。 采用跳过扫描运算符来促进公开的重启技术。