| 摘要 |
Of a counter apparatus, a first microcomputer and a second microcomputer communicate with each other and receive a crank signal with pulses. The first microcomputer detects a first pulse count number at a detection time point and transmits it to the second microcomputer. The second microcomputer detects a second pulse count number at a determination time point, which is an allowable delay time period later from the detection time point. The allowable delay time period is expected to elapse from the detection time point to when the first pulse count number is received by the second microcomputer. The second pulse count number is compared with a determination value, which is the sum of (i) the first pulse count number and (ii) the largest integer not greater than the quotient of T2/T1, T1 being a pulse period of the crank signal, T2 being the allowable delay time period. |
| 主权项 |
1. A counter apparatus that receives a crank signal with a signal level reciprocating between a high level and a low level to indicate a pulse that takes place each time a crank rotates by a predetermined angle,
the counter apparatus comprising: a first microcomputer receiving the crank signal; and a second microcomputer receiving the crank signal, the second microcomputer being electrically connected with the first microcomputer, the first microcomputer detecting a first pulse count number at a detection time point and transmitting the first pulse count number to the second microcomputer,
the first pulse count number being the number of pulses included in the crank signal received by the first microcomputer, the second microcomputer detecting a second pulse count number at a determination time point,
the second pulse count number being the number of pulses included in the crank signal received by the second microcomputer,the determination time point being later since the detection time point by a time period equal to or greater than a processing time period that is expected to elapse from the detection time point to when the first pulse count number is received by the second microcomputer, the second microcomputer determining whether the crank signal received by the first microcomputer is equal to the crank signal received by the second microcomputer by comparing the second pulse count number with a determination value that is the sum of (i) the first pulse count number and (ii) the largest integer not greater than the quotient of T2/T1, T1 being a pulse period of the crank signal, T2 being an allowable delay time period that ranges from the detection time point to the determination time point. |
