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    • 14. 发明授权
    • System and method for detecting vehicle speed sensor tampering
    • 用于检测车速传感器篡改的系统和方法
    • US5896083A
    • 1999-04-20
    • US859835
    • 1997-05-16
    • S. Miller Weisman, IIRichard Avery
    • S. Miller Weisman, IIRichard Avery
    • B60K31/00F16H59/44F16H61/12B60Q1/00
    • F16H59/44B60K31/00F16H2061/1208F16H61/12Y10T477/679
    • A system and method for detecting tampering with a vehicle speed sensor input signal include determining a current gear ratio, comparing the current gear ratio to at least one reference gear ratio to determine a gear ratio difference value, and generating an error signal indicating tampering with the vehicle speed sensor signal when the gear ratio difference value exceeds a first threshold. In one embodiment the step of generating an error signal is performed only when the gear ratio difference value exceeds the first threshold for an elapsed time greater than a predetermined time period. One embodiment includes determining a current engine speed, current vehicle speed, and current transmission gear ratio and storing values for the current engine speed, vehicle speed, and transmission gear ratio in the memory whenever at least one predetermined criterion is satisfied. The system and method calculate difference values between the current engine speed, vehicle speed, and transmission gear ratio and corresponding previously stored respective values. A signal indicating tampering is generated when at least one of the difference values exceeds a corresponding threshold.
    • 用于检测篡改车速传感器输入信号的系统和方法包括确定当前齿轮比,将当前齿轮比与至少一个参考齿轮比进行比较以确定齿轮比差值,并产生指示篡改 当齿轮比差值超过第一阈值时车速传感器信号。 在一个实施例中,只有当传动比差值超过超过预定时间段的经过时间的第一阈值时,才执行产生误差信号的步骤。 一个实施例包括当满足至少一个预定标准时,确定当前发动机转速,当前车速和当前变速传动比,以及存储当前发动机转速,车速和变速传动比的值。 该系统和方法计算当前发动机转速,车速和变速齿轮比之间的差值以及相应的先前存储的相应值。 当差值中的至少一个超过相应的阈值时,产生指示篡改的信号。