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    • 4. 发明授权
    • Method and apparatus for frequency synthesis in direct-conversion transmitters
    • 直接转换发射机频率合成方法及装置
    • US07409192B2
    • 2008-08-05
    • US11186380
    • 2005-07-21
    • Frank LombardiJohn G. FreedMartin Isberg
    • Frank LombardiJohn G. FreedMartin Isberg
    • H04B1/04
    • H04B1/30H03C3/0966H03C3/0983H03C5/00H03L7/185H03L7/1974H03L7/23
    • A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal to obtain an intermediate frequency reference signal, generates the transmit frequency signal by using the mixing frequency signal to downconvert the transmit frequency signal into an intermediate frequency feedback signal, and phase-locks the intermediate frequency feedback signal to the intermediate frequency reference signal. The transmit frequency signal may be phase modulated, and may serve as an input to a saturated-mode power amplifier that can be configured for corresponding amplitude modulation. Alternatively, the un-modulated transmit frequency signal serves as the carrier signal input to a quadrature modulator, which imparts I/Q modulations to it, thereby producing a modulated carrier signal for input to a linear power amplifier.
    • 用于直接转换传输的方法和装置产生与发射频率信号非谐波相关的第一频率信号,分频第一频率信号以获得混频信号,分频第一频率信号以获得中频参考信号 通过使用混频信号来生成发送频率信号,以将发送频率信号下变频成中频反馈信号,并将中频反馈信号相位锁定到中频参考信号。 发射频率信号可以是相位调制的,并且可以用作可以被配置用于对应的幅度调制的饱和模式功率放大器的输入。 或者,未调制的发送频率信号用作输入到正交调制器的载波信号,其向其施加I / Q调制,从而产生用于输入到线性功率放大器的调制载波信号。
    • 5. 发明申请
    • Limiting pump flow during overspeed self-actuation condition
    • 在超速自动启动条件下限制泵流量
    • US20080022973A1
    • 2008-01-31
    • US11496701
    • 2006-07-31
    • Daniel R. PuckettScott F. ShaferFrank Lombardi
    • Daniel R. PuckettScott F. ShaferFrank Lombardi
    • F02M57/02F02M37/04
    • F02D41/3845F02D41/123F02M59/08F02M59/366F02M63/0205F02M63/0225
    • In an engine equipped with a common rail fuel injection system, the engine can sometimes experience an overspeed condition, and the pump may respond to this overspeed condition with self-actuation even in the absence of any control signal. In order to prevent an over pressurization condition, a liquid supply into a pumping chamber of the pump is limited during a retraction stroke of a pump plunger by energizing an electrical actuator coupled to a spill valve, to move the spill valve toward a closed position. The electrical actuator is de-energized during a pumping stroke of the pump plunger to allow the spill valve to more toward an open position. Liquid from the pumping chamber is discharged through the spill valve during the pumping stroke, but over pressurization is avoided by limiting the amount of liquid that can enter the pumping chamber during the retraction stroke.
    • 在配有共轨燃油喷射系统的发动机中,发动机有时会经历超速状态,并且即使在没有任何控制信号的情况下,泵也可以用自动致动来响应该超速状态。 为了防止过度加压的情况,通过对连接到溢流阀的电动致动器进行激励,使溢流阀向关闭位置移动,在泵柱塞的回缩行程期间限制泵的泵送室中的液体供应。 在泵柱塞的泵送冲程期间,电致动器被断电以允许溢流阀更向着打开位置。 来自泵送室的液体在泵送冲程期间通过溢流阀排出,但是通过限制在回缩冲程期间可以进入泵送室的液体的量来避免加压。
    • 10. 发明授权
    • Apparatus and method for positioning an excavator housing
    • 挖掘机壳体定位装置及方法
    • US06052636A
    • 2000-04-18
    • US905510
    • 1997-08-04
    • Frank Lombardi
    • Frank Lombardi
    • E02F9/22E02F9/12E02F9/20G05D16/00
    • E02F9/123E02F9/128E02F9/2025Y10S388/929
    • An apparatus and method for rotatably positioning a machine housing is disclosed. A pump produces pressurized fluid to a motor that responsively rotates the machine housing. A control valve regulates fluid flow from the pump to the motor. A position sensor detects the rotational position of the housing and responsively produces an actual position signal. A device produces a signal indicative of a desired rotational position of the housing. A controller compares the desired and actual position signals, responsively produces an error signal, multiplies the error signal by a variable gain value representative of the housing acceleration and delivers a control signal to the control valve to rotate the housing to the desired position.
    • 公开了一种用于可旋转地定位机器壳体的装置和方法。 泵产生加压流体到电动机,其响应地旋转机器壳体。 控制阀调节从泵到电机的流体流量。 位置传感器检测壳体的旋转位置并且响应地产生实际位置信号。 设备产生指示壳体的期望旋转位置的信号。 控制器比较期望和实际位置信号,响应地产生误差信号,将误差信号乘以代表壳体加速度的可变增益值,并将控制信号传送到控制阀以将壳体旋转到期望的位置。