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A system for measuring distance traveled by a vehicle periodically updates the accumulated measurements, displays the updated measurements and electronically stores corresponding accumulations of updated distance data in a non-volatile memory device. The system employs a method of reading through th

A system for measuring distance traveled by a vehicle periodically updates the accumulated measurements, displays the updated measurements and electronically stores corresponding accumulations of updated distance data in a non-volatile memory device. The system employs a method of reading through the sequentially ordered storage locations of the non-volatile memory to determine the most recently stored correct data value as a value to be both displayed and used as a base value for subsequent measured distance accumulation.

대표청구항 ▼

In an electronic odometer, a method of reading data from a non-volatile memory (NVM) device having data stored in one or more of a predetermined number of sequentially ordered storage locations including the following ordered steps of: (a) selecting a storage location in said NVM as a starting read

In an electronic odometer, a method of reading data from a non-volatile memory (NVM) device having data stored in one or more of a predetermined number of sequentially ordered storage locations including the following ordered steps of: (a) selecting a storage location in said NVM as a starting read location; (b) reading the data value present in the selected read location; (c) comparing parity coded portions of the read data value with predetermined correct parity values to determine if said read data value is parity correct or not; (d) advancing the reading location to the next sequential location in said NVM and repeating steps (b) and (c) only until the selected reading location is again equal to said starting reading location when said compared parity in step (c) is incorrect; (e) providing a data error indication and ending said method when said compared parity in step (c) is incorrect and said reading location is again equal to said starting read location; (f) temporarily storing the read data value in another memory device when the compared parity of step (c) is correct; (g) advancing the selection of the reading location to the next sequential location in said NVM; (h) providing said temporarily stored data value as a correct base odometer value and ending said method only when said selected read location is again equal to said starting read location; (i) reading the data value present in the advanced read location; (j) comparing the parity coded portions of the read data value with predetermined correct parity values to determine if said read data value is parity correct or not; (k) repeating sequential steps of (g) through (j) when said compared parity in step (j) is incorrect; (l) comparing the data value read in step (i) with the value temporarily stored in said other memory device when said compared parity in step (j) is correct to determine if said value read is within a predetermined relationship established with respect to the temporarily stored value; (m) replacing the previously temporarily stored data in step (f) with the read data value compared in step (l) when that read data value is within the predetermined relationship established with respect to the previously temporarily stored value; (n) repeating steps (g) through (m); (o) repeating step (g) when the read data value compared in step (l) is without the predetermined relationship established with respect to the previously temporarily stored value; (p) repeating steps (i) through (m) only until the selected read location is again equal to said starting read location; (q) advancing the selection of the starting read location to the next sequential location in said NVM; (r) repeat steps (b) through (q) only until the starting read location is again equal to the starting read location selected in step (a); and (s) providing a data error indication and ending said method when said starting read location is again equal to the starting read location selected in step (a).