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    Method and apparatus for control of a motor-driven brake actuator
    3.
    发明授权
    Method and apparatus for control of a motor-driven brake actuator 有权
    用于控制电动制动执行器的方法和装置

    公开(公告)号：US06913327B2

    公开(公告)日：2005-07-05

    申请号：US10464074

    申请日：2003-06-18

    申请人： Richard James Thomas

    发明人： Richard James Thomas

    IPC分类号： B60T13/74 ,  B60T8/60

    CPC分类号： B60T13/741

    摘要： The present invention provides a method and control scheme to operate a motor-driven actuator. This includes determining actuator force on an external device, determining a command force, and monitoring actuator position. A determination is made whether to operate in a force-control mode or a position-control mode. Both the force-control mode and the position-control mode employ a common feedback control method (e.g. PI or PID). The system operates the actuator in the force-control mode, using actuator force as feedback to the control scheme when the controller determines that the force sensor is operating in its linear range. When the force sensor is operating outside or near the limits of its linear range, the control scheme determines a pseudo-force, comprising estimated force based upon measured position. The pseudo-force is input to the common feedback control method to control the actuator.

    摘要翻译： 本发明提供一种操作电机驱动致动器的方法和控制方案。 这包括确定外部设备上的致动器力，确定指令力和监视执行机构位置。 确定是否在力控制模式或位置控制模式下操作。 力控制模式和位置​​控制模式都采用公共反馈控制方法（例如PI或PID）。 当控制器确定力传感器在其线性范围内运行时，系统以强制控制模式操作执行器，使用致动器力作为控制方案的反馈。 当力传感器在其线性范围的限制之外或接近其线性范围的极限时，控制方案确定伪力，其包括基于测量位置的估计力。 将伪力输入到公共反馈控制方法中以控制致动器。

    Brake system and method having secondary hydraulic braking in a de-energized operational mode
    4.
    发明授权
    Brake system and method having secondary hydraulic braking in a de-energized operational mode 有权

    公开(公告)号：US06533369B2

    公开(公告)日：2003-03-18

    申请号：US09821970

    申请日：2001-03-30

    申请人： Ernst S. Baumgartner ,  Bryan Peter Riddiford ,  Schuyler S. Shaw ,  John Benjamin Hageman ,  Richard James Thomas

    发明人： Ernst S. Baumgartner ,  Bryan Peter Riddiford ,  Schuyler S. Shaw ,  John Benjamin Hageman ,  Richard James Thomas

    IPC分类号： B60T860

    CPC分类号： B60T8/4081

    摘要： A brake system and method of controlling the system are disclosed. The system provides secondary hydraulic braking in a de-energized mode. The system includes a wheel brake associated with wheels of a vehicle typically at each corner of the vehicle. The wheel brake typically includes a caliper or drum for deceleration of the vehicle. The system includes a master cylinder in fluid communication with the wheel brake. In the de-energized mode, the master cylinder operates the wheel brake. A solenoid isolation valve decouples the master cylinder from the wheel brake when the system is in a normal, i.e., an energized, mode. As such, the master cylinder is isolated from the wheel brake and is prevented from operating the wheel brake. Alternatively, in the de-energized mode, the isolation valve couples the master cylinder with the wheel brake to provide the secondary hydraulic braking. The system includes an actuator assembly for operation of the wheel brake independent of the master cylinder when the system is in the energized operational mode. A second, normally-closed, solenoid valve opens in the energized mode to couple the actuator assembly with the wheel brake. The second solenoid valve closes in the de-energized mode to isolate the actuator assembly from the wheel brake such that the secondary hydraulic braking is provided through the master cylinder.

    Traceback stage for a viterbi decoder
    5.
    发明授权
    Traceback stage for a viterbi decoder 失效
    维特比解码器的追溯阶段

    公开(公告)号：US5987637A

    公开(公告)日：1999-11-16

    申请号：US802189

    申请日：1997-02-18

    申请人： Richard James Thomas

    发明人： Richard James Thomas

    IPC分类号： H03M13/23 ,  H03M13/41 ,  G06F11/10

    CPC分类号： H03M13/6502 ,  H03M13/395 ,  H03M13/4169

    摘要： In a traceback unit for an M-step Viterbi decoder for a convolutionally encoded data stream, each of the traceback stages has a group of K input wires representing K possible candidate states. A bank of K multiplexers selects one of 2.sup.M of the input wires according to M bits of traceback data. The K multiplexer outputs feed a succeeding traceback stage. M groups of K wires carry the traceback data, with each wire being connected to a selection line of each multiplexer. At the output of the traceback unit an identification circuit identifies a subgroup of the K possibilities which has a maximum number of candidate states remaining therein. The arrangement obviates the need for retiming between every traceback stage.

    摘要翻译： 在用于卷积编码数据流的M阶维特比解码器的追溯单元中，每个追溯级具有表示K个可能候选状态的一组K个输入线。 一组K复用器根据回溯数据的M位选择2M个输入线中的一个。 K多路复用器输出馈送后续回溯阶段。 M组K线承载回溯数据，每条线连接到每个复用器的选择线。 在回溯单元的输出处，识别电路识别存在其中剩余候选状态的最大数目的K个可能性的子组。 该安排避免了在每个回溯阶段之间重新定时的需要。