TIME SYNCRONIZATION BETWEEN BATTERY CONTROLLER MODULES FOR PARAMETER MEASUREMENTS

摘要

A multi-cell battery pack in an electric vehicle is monitored by multiple sensing modules. A primary controller is coupled to a first plurality of cells to measure a predetermined parameter of each cell. The primary controller determines a sampling moment recurring at a fixed frequency for sampling the predetermined parameter of each of the first plurality of cells. The primary controller generates a sync pulse at each sample moment. A secondary controller is coupled to a second plurality of cells to measure the predetermined parameter of each cell. The secondary controller receives the sync pulse to start a pulse generator operating at a frequency which is a predetermined multiple of the primary controller fixed frequency. The secondary controller counts pulses generated by the pulse generator and schedules a synchronized secondary sampling moment according to a predetermined pulse count.

主权项

1. Apparatus for an electric vehicle having at least one multi-cell battery pack, comprising:
a primary controller coupled to a first plurality of cells to measure a predetermined parameter of each cell, the primary controller determining a sampling moment recurring at a fixed frequency for sampling the predetermined parameter of each of the first plurality of cells, wherein the primary controller generates a sync pulse at each sample moment; a secondary controller coupled to a second plurality of cells to measure the predetermined parameter of each cell, the secondary controller receiving the sync pulse to start a pulse generator operating at a frequency which is a predetermined multiple of the primary controller fixed frequency, the secondary controller counting pulses generated by the pulse generator and scheduling a secondary sampling moment according to a predetermined pulse count.