公开(公告)号：US4158172A

公开(公告)日：1979-06-12

申请号：US857539

申请日：1977-12-05

Applicant: Curtis E. Boyer ,  Jacques Mosier

Inventor： Curtis E. Boyer ,  Jacques Mosier

IPC: G01P3/489 ,  G01P3/54 ,  G01R23/10

CPC classification number: G01R23/10 ,  G01P3/489 ,  G01P3/54

Abstract: A digital speedometer for indicating angular or linear velocity has an index counter to control update of the displayed velocity. The purpose of the index counter is to prevent undesirable fluctuation of the displayed velocity where minor variations in velocity being measured have occurred. The digital speedometer uses a pulsating input signal having a frequency proportional to the velocity to be indicated. An oscillator circuit provides a clock frequency that is utilized in generating a counting period electrical signal. During the counting period, the input pulses proportional to velocity are gated into a counter. After each counting period, a comparison is made between the count currently being displayed and the count stored in the counter. If a difference occurs, the index counter is incremented. Only after the index counter has been incremented a plurality of consecutive times is the display permitted to be updated.

Abstract translation: 用于指示角速度或线性速度的数字速度计具有用于控制显示速度的更新的索引计数器。 指数计数器的目的是防止在测量的速度发生微小变化的显示速度的不期望的波动。 数字速度计使用具有与速度成比例的频率的脉动输入信号来指示。 振荡器电路提供用于产生计数周期电信号的时钟频率。 在计数期间，与速度成比例的输入脉冲被选通到计数器中。 在每个计数周期之后，在当前显示的计数与存储在计数器中的计数之间进行比较。 如果发生差异，则索引计数器递增。 只有在索引计数器递增之后，多个连续的时间是允许更新的显示。

公开(公告)号：US4151466A

公开(公告)日：1979-04-24

申请号：US857496

申请日：1977-12-05

Applicant: Curtis E. Boyer ,  Jacques Mosier

Inventor： Curtis E. Boyer ,  Jacques Mosier

IPC: G01P3/489 ,  G01P3/54

CPC classification number: G01P3/489

Abstract: A digital speedometer for indicating angular or linear velocity has an index counter to control update of the displayed velocity. The purpose of the index counter is to prevent undesirable fluctuation of the displayed velocity where minor variations in velocity being measured have occurred. The digital speedometer uses a pulsating input signal having a frequency proportional to the velocity to be indicated. An oscillator circuit provides a clock frequency that is utilized in generating a counting period electrical signal. During the counting period, the input pulses proportional to velocity are gated into a counter. After each counting period, a comparison is made between the count currently being displayed and the count stored in the counter. If a difference occurs, the index counter is incremented. Only after the index counter has been incremented a plurality of consecutive times is the display permitted to be updated.

Abstract translation: 用于指示角速度或线性速度的数字速度计具有用于控制显示速度的更新的索引计数器。 指数计数器的目的是防止在测量的速度发生微小变化的显示速度的不期望的波动。 数字速度计使用具有与速度成比例的频率的脉动输入信号来指示。 振荡器电路提供用于产生计数周期电信号的时钟频率。 在计数期间，与速度成比例的输入脉冲被选通到计数器中。 在每个计数周期之后，在当前显示的计数与存储在计数器中的计数之间进行比较。 如果发生差异，则索引计数器递增。 只有在索引计数器递增之后，多个连续的时间是允许更新的显示。