| 摘要 |
PCT No. PCT/US88/04357 Sec. 371 Date Dec. 27, 1988 Sec. 102(e) Date Dec. 27, 1988 PCT Filed Dec. 9, 1988 PCT Pub. No. WO90/06517 PCT Pub. Date Jun. 14, 1990.An apparatus (10) for use on electronically controlled fuel injection systems senses speed, angular position, and direction of rotation using only a single Hall effect type sensor (24). A disk element (14) is fixedly connected to and rotatable with the camshaft of an internal combustion engine. The disk element (14) includes a plurality of circumferential zones (16a-16x) of substantially identical length with each zone (16a-16x) having first (18a-18x) and second (20a-20x) areas. A first portion 16c-16t, 16v-16x) of these circumferential zones (16a-16x) have first (18c-18t, 18v-18x) and second areas (20c-20t, 20v-20x) which are substantially different in length than the first (18a, 18b, 18u) and second areas (20a, 20b, 20u) of a second portion ( 16a, 16b, 16u) of the circumferential zones (16a-16x). Accordingly, the sensor (24) delivers a signal which has a frequency directly related to the instantaneous velocity of the disk element (14), but varies in pulse width in response to the first (16c-16t, 16v-16x) and second (16a, 16b, 16u) portions of the circumferential zones (16a-16x). A microprocessor (46) operating under software control detects the instantaneous angular position and direction of rotation of the disk element (14) by locating the second portion (16a, 16b, 16u) of the circumferential zones (16a-16x) and the order in which they are received.
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