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    • 3. 发明授权
    • Anti-lock braking system containing look-up table for determining wheel
velocity and acceleration
    • 包含用于确定车轮速度和加速度的查找表的防抱死制动系统
    • US5491634A
    • 1996-02-13
    • US319206
    • 1994-10-06
    • Roger L. MillerThomas P. Harper
    • Roger L. MillerThomas P. Harper
    • B60T8/1761B60T8/66B60T17/00
    • B60T8/17616
    • An anti-lock braking system includes a mechanism for releasing a brake and a digital circuit for determining a wheel velocity and controlling the mechanism to prevent the brake from locking. The digital circuit uses a look-up table which, in response to an address signal, provides a signal indicating a multiplicative inverse of a number between 1 and 2. The circuit receives a measured time for a wheel to move a fixed distance and factors the time as product a power of two and a factor between 1 and 2. An address signal indicating the factor is applied to the look-up table, and the look-up table provides a signal which indicates the inverse of the factor. The signal from the look-up table is then converted to the proper scale for the time. Factoring and conversion may be accomplished with logical shifts so that no multiplier is required. The look-up table may be compressed by not storing bits of inverses, which are constant or only change once within the range of the look-up table and by only storing look-up values for every other number within the range of the look-up table. A code bit in each look-up table value permits generation of correct inverses for values not stored.
    • 防抱死制动系统包括用于释放制动器的机构和用于确定车轮速度的数字电路并且控制机构以防止制动器锁定。 数字电路使用查找表,该查找表响应于地址信号提供指示1和2之间的数字的乘法反相的信号。该电路接收用于轮移动固定距离的测量时间, 时间作为产品的功率为2,因子介于1和2之间。指示因子的地址信号被施加到查找表,并且查找表提供指示因子的倒数的信号。 然后,来自查表的信号被转换成适当的时间。 保理和转换可以通过逻辑移位来实现,因此不需要乘数。 可以通过不存储反转的位来压缩查找表,该比特是恒定的,或者仅在查找表的范围内改变一次,并且仅通过在查找表的范围内存储每隔一个数字的查找值, 桌子。 每个查找表值中的代码位允许为未存储的值生成正确的反转。
    • 4. 发明授权
    • Anti-lock braking system
    • 防抱死制动系统
    • US5372410A
    • 1994-12-13
    • US190811
    • 1994-02-02
    • Roger L. MillerThomas P. Harper
    • Roger L. MillerThomas P. Harper
    • B60T8/40B60T8/88B60T8/32
    • B60T8/404B60T8/885Y10S303/09
    • An anti-lock braking system includes three integrated circuits (an integrated voltage regulator and two different microcontrollers) which perform different functions but share the tasks of detecting malfunctions and shutting down the system when malfunctions are detected. The two different microcontrollers perform different functions, have different circuitry, and execute different software. Typically, a first microcontroller receives wheel sensor signals, calculates wheel velocities and accelerations, and operates mechanical devices which control braking. A second microcontroller executes the main anti-lock braking software and determines from the velocities and accelerations when brakes should be released. All of the integrated circuits monitor each other and the other elements of the anti-lock braking system to detect malfunctions. Multiple shut down methods are provided so that a single chip failure can be safely handled. The three integrated circuits can be fabricated using different device technologies and design rules so that the operating environment of the anti-lock braking system is less likely to cause simultaneous failures in multiple integrated circuits.
    • 防抱死制动系统包括执行不同功能的三个集成电路(集成稳压器和两个不同的微控制器),但共享检测到故障时检测故障和关闭系统的任务。 两个不同的微控制器执行不同的功能,具有不同的电路,并执行不同的软件。 通常,第一微控制器接收车轮传感器信号,计算车轮速度和加速度,并且操作控制制动的机械装置。 第二个微控制器执行主防抱死制动软件,并确定当制动器应释放时的速度和加速度。 所有的集成电路都可以互相监视和防抱死制动系统的其他元件来检测故障。 提供多重关闭方法,以便可以安全地处理单个芯片故障。 可以使用不同的设备技术和设计规则来制造三个集成电路,使得防抱死制动系统的操作环境不太可能导致多个集成电路中的同时故障。