| 摘要 |
<p>After integration at 14, the signals 12 from two sensors 13 for different variables are periodically added to the contents of respective stores 21, and integrators 14 are reset. The outputs 27 of the stores are divided at 25 to provide directly a quotient 26 of the integrated outputs of the sensors at least over the short term. For longer periods, every time either signal 27 reaches a threshold 28 at which errors occur, e.g. commencement of non-linear storage (or overflow of a digital store, Fig. 2), circuit elements 29, 30, 34, 38, 43 are operated to divide both stored signals by the same factor and element 35 reduces the inputs to stores 21 correspondingly. Any part of signal 19 not transferred via circuit 35 to store 21 is returned to the reset integrator 14 for the next cycle. Cycle times of integrators 14 may be fixed or (as shown) be terminated whenever a signal 19 reaches a threshold value 23. Applications given are average speed from distance and time, and average fuel consumption over the whole useful life of a motor vehicle. <IMAGE></p> |
