| 摘要 |
<p>A digital electronic vehicle tyre inflator (1) comprises a housing (2) having a visual display screen (7), a compressed air supply port (42), a delivery port (45) to a tyre, and a gauge port (46); user-operable valve means (19, 16) within the housing (2) to control the flow of air during tyre inflation and deflation, and a microprocessor (34) coupled to an electronic pressure transducer (26), to a battery pack or external power supply and to a numerical visual display, wherein, in use, the microprocessor (34) initiates frequent monitoring (e.g. ten times per second) by the transducer (26) of the rise or fall of pressure between the last recorded gauge pressure and the next inflation/deflation value, from which data a rate of change of pressure is calculated, and as a result of such calculation if the rate of change is within a predetermined range, displays gauge pressure, or if the rate of change falls outside the predetermined range, suppresses display of the gauge pressure to a blank screen, or zero value, or non-numerical display.</p> |
