초록 ▼

A vehicle odometer system for counting pulses representing translation and storing in nonvolatile form binary data representing the decimal values of the odometer data. The architecture of the circuit is structured to use the data in the more significant digit positions of the odometer count as poin

A vehicle odometer system for counting pulses representing translation and storing in nonvolatile form binary data representing the decimal values of the odometer data. The architecture of the circuit is structured to use the data in the more significant digit positions of the odometer count as pointers for the nonvolatile storage addresses used to store data for the less significant digit positions. This arrangement ensures that the endurance capabilities of the nonvolatile memory array are taken into account while apportioning degradation in relation to the significance of the odometer data to be stored. Furthermore, electronic manipulation of the odometer data is prevented by inclusion of a write only high odometer value flag which cannot be removed and is redundantly detected.

대표청구항 ▼

A circuit for digitally accumulating and storing odometer information, comprising: a source of digital signals representing odometer data; a binary counter configured from volatile electronic devices and operable to accumulate in successive stages information representing digital odometer data; a no

A circuit for digitally accumulating and storing odometer information, comprising: a source of digital signals representing odometer data; a binary counter configured from volatile electronic devices and operable to accumulate in successive stages information representing digital odometer data; a nonvolatile memory array which stores at individually addressable locations binary words representing decimal odometer data; a bus connecting the nonvolatile memory array to the stages of the binary counter; means for defining a correspondence between a binary counter stage and a nonvolatile memory array addressable location for purposes of reading or writing data; means for relocating a first addressable location assigned to store binary data representing first decimal value odometer data by generating a first new address from first high value decimal odometer data; and means for relocating a second addressable location assigned to store binary data representing second decimal value odometer data by generating a second new address from second high value decimal odometer data.