System and Method for Determining the Specific Gravity of a Gaseous Fuel
    2.
    发明申请
    System and Method for Determining the Specific Gravity of a Gaseous Fuel 有权
    确定气体燃料比重的系统和方法

    公开(公告)号:US20150369716A1

    公开(公告)日:2015-12-24

    申请号:US14311853

    申请日:2014-06-23

    申请人: Caterpillar Inc.

    IPC分类号: G01N9/26

    CPC分类号: G01N9/26 G01N33/225

    摘要: The disclosure relates to a system and method for determining the specific gravity of a fuel used in a dual fuel engine. The system includes a fuel rail, at least one sensor, and a processor. The method includes sensing and recording, with the at least one sensor and the at least one memory, a first pressure profile of a first fuel in the fuel rail and a second pressure profile of a second fuel in the fuel rail. The first fuel has a known specific gravity and the second fuel has an unknown specific gravity. The method further includes calculating the second specific gravity of the second fuel, with a processor, based on the first pressure profile, the second pressure profile, and the first specific gravity.

    摘要翻译: 本公开涉及一种用于确定在双燃料发动机中使用的燃料的比重的系统和方法。 该系统包括燃料轨,至少一个传感器和处理器。 该方法包括利用至少一个传感器和至少一个存储器来感测和记录燃料轨道中的第一燃料的第一压力分布和燃料轨道中的第二燃料的第二压力分布。 第一燃料具有已知比重,第二燃料具有未知的比重。 该方法还包括基于第一压力分布,第二压力分布和第一比重,用处理器计算第二燃料的第二比重。

    Transient controller and method for dual fuel engine

    公开(公告)号:US10927776B2

    公开(公告)日:2021-02-23

    申请号:US16410380

    申请日:2019-05-13

    申请人: Caterpillar Inc.

    摘要: A controller for an internal combustion engine is configured to operate the engine at a desired output power and at a desired air/fuel ratio provided in the cylinder, the desired air/fuel ratio depending on an amount of air, the primary fuel, and the secondary fuel provided to the cylinder selectively; gradually increase a power output of the engine during a transient event from an initial power output, to an intermediate power output, and then to a final power output; during the transient event, simultaneously with the power output increase, increase the amount of the primary fuel and the secondary fuel to produce a rich air/fuel ratio in the cylinder.

    Multi-Fuel Engine And Method Of Operating The Same
    6.
    发明申请
    Multi-Fuel Engine And Method Of Operating The Same 审中-公开
    多燃料发动机及其运行方法

    公开(公告)号:US20160208749A1

    公开(公告)日:2016-07-21

    申请号:US14600841

    申请日:2015-01-20

    申请人: Caterpillar Inc.

    IPC分类号: F02M43/04

    摘要: A method for controlling fuel flow in a multi-fuel engine is disclosed. The method includes determining an estimated lower heating value (LHV) of a gaseous fuel by, at least, comparing a mapped volume flow value with an input volume flow value, the input volume flow value based on the input power. The method further includes determining a gaseous fuel flow rate for the gaseous fuel, the gaseous fuel flow rate based on, at least, a specific fuel substitution ratio of the gaseous fuel and a secondary fuel and the estimate LHV of the gaseous fuel source.

    摘要翻译: 公开了一种用于控制多燃料发动机中的燃料流量的方法。 该方法包括通过至少将映射的体积流量值与输入体积流量值(基于输入功率)的输入体积流量值进行比较来确定气体燃料的估计的较低热值(LHV)。 该方法还包括基于气态燃料和二次燃料的特定燃料替代比和气体燃料源的估计LHV来确定气体燃料的气态燃料流量,气体燃料流量。

    Intake Pressure Control Strategy In Gaseous Fuel Internal Combustion Engine
    7.
    发明申请
    Intake Pressure Control Strategy In Gaseous Fuel Internal Combustion Engine 审中-公开
    气体燃料内燃机进气压力控制策略

    公开(公告)号:US20150300281A1

    公开(公告)日:2015-10-22

    申请号:US14257093

    申请日:2014-04-21

    申请人: Caterpillar Inc.

    IPC分类号: F02D41/00

    摘要: Controlling intake pressure in a gaseous fuel internal combustion engine includes calculating a control term in an intake pressure control loop based on a pressure error, and adjusting a throttle valve and a second valve responsive to the control term in first and second control loop cycles. The second valve is within a return conduit returning compressed gases from a location downstream a compressor to a location upstream. A pressure of gaseous fuel and air within the intake conduit is changed via the adjustments so as to reduce the pressure error.

    摘要翻译: 控制气体燃料内燃机中的进气压力包括基于压力误差来计算进气压力控制回路中的控制项,以及响应于第一和第二控制回路循环中的控制项来调节节流阀和第二阀。 第二阀在回流管道内,将压缩气体从压缩机下游的位置返回到上游位置。 进气管道内的气体燃料和空气的压力通过调节改变,以减小压力误差。

    Method and system for controlling an air-fuel ratio in an engine using a fuel source with an unknown composition
    9.
    发明授权
    Method and system for controlling an air-fuel ratio in an engine using a fuel source with an unknown composition 有权
    使用未知组成的燃料源来控制发动机中的空燃比的方法和系统

    公开(公告)号:US09593629B2

    公开(公告)日:2017-03-14

    申请号:US14639453

    申请日:2015-03-05

    申请人: Caterpillar Inc.

    摘要: A method for controlling an air-fuel ratio (AFR) in an engine powered by a gaseous fuel having an unknown composition may comprise receiving an assumed gas species composition for the gaseous fuel, and determining an assumed lower heating value (LHV) for the assumed gas species composition. The method may further comprise determining a perceived lower heating value (LHV) for the gaseous fuel based on a perceived gas mass flow and a gas energy flow for the gaseous fuel, and updating the assumed gas species composition until the assumed LHV and the perceived LHV are aligned. The method may further comprise determining a desired AFR and an airflow necessary to provide the desired AFR using the aligned gas species composition and a desired lambda (λ), and adjusting an air system controller of the engine to provide the airflow.

    摘要翻译: 用于控制由具有未知组成的气体燃料驱动的发动机中的空燃比(AFR)的方法可以包括接收用于气体燃料的假设气体组分,并且为假定的假定的低热值(LHV)确定 气体组成。 该方法可以进一步包括基于感知的气体质量流量和气体燃料的气体能量流量来确定气体燃料的感知到的较低热值(LHV),并且更新所假定的气体种类组成,直到假设的LHV和感知的LHV 对齐。 该方法可以进一步包括使用对准的气体种类组合物和期望的λ(λ)来确定所需的AFR和提供期望的AFR所需的气流,以及调节发动机的空气系统控制器以提供气流。

    SYSTEM AND METHOD FOR CONTROLLING AIR-FUEL RATIO
    10.
    发明申请
    SYSTEM AND METHOD FOR CONTROLLING AIR-FUEL RATIO 审中-公开
    用于控制空气 - 燃料比的系统和方法

    公开(公告)号:US20160252036A1

    公开(公告)日:2016-09-01

    申请号:US15150751

    申请日:2016-05-10

    申请人: Caterpillar Inc.

    IPC分类号: F02D41/24 F02D41/14

    摘要: The disclosure provides a method to operate an engine system. The method begins by determination of a current NOx value. If the current NOx value is greater than a first predetermined NOx target, an air-fuel ratio (AFR) set-point is adjusted by a first predetermined value in towards a rich AFR. Upon detection of the current NOx value below the first predetermined NOx target, a first average of NOx values for a first predetermined time is determined. The AFR set-point is adjusted by a second predetermined value and a second average of NOx values for a second predetermined time is determined. A delta NOx value is determined as a difference between the first average and the second average and compared with a second predetermined NOx target. The AFR set-point is determined when the delta NOx value is below the second predetermined NOx target.

    摘要翻译: 本公开提供了一种操作发动机系统的方法。 该方法通过确定当前的NOx值开始。 如果当前的NOx值大于第一规定的NOx目标,则将空燃比(AFR)设定点向着浓AFR调整第一预定值。 当检测到当前NOx值低于第一预定NOx目标值时,确定第一预定时间的NOx值的第一平均值。 AFR设定点被调整第二预定值,并确定第二预定时间的NOx值的第二平均值。 Δδ值被确定为第一平均值和第二平均值之差,并与第二预定NOx目标进行比较。 当ΔNOX值低于第二预定NOx靶时,确定AFR设定点。