Time synchronization between battery controller modules for parameter measurements
First Claim
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 of the second plurality, the secondary controller receiving the sync pulse directly from the primary controller 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.
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Abstract
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.
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Citations
19 Claims
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1. Apparatus for an electric vehicle having at least one multi-cell battery pack, comprising:
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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 of the second plurality, the secondary controller receiving the sync pulse directly from the primary controller 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of synchronizing parameter measurements of a multi-cell battery in an electric vehicle, comprising;
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a primary controller coupled to a first plurality of battery cells determining a primary sampling moment recurring at a fixed frequency; at the primary sampling moment, the primary controller generating a sync pulse and sampling a predetermined parameter of each of the first plurality of battery cells; a secondary controller coupled to a second plurality of battery cells starting a pulse generator operating at a frequency which is a predetermined multiple of the primary controller fixed frequency in response to receiving the sync pulse directly from the primary controller; the secondary controller counting pulses generated by the pulse generator and scheduling a secondary sampling moment according to a predetermined pulse count; and the secondary controller sampling the predetermined parameter of each battery cell of the second plurality at the secondary sampling moment. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for synchronizing battery cell measurements, comprising:
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a primary controller generating a primary sampling moment recurring at a fixed frequency; and a secondary controller having a pulse generator operating at a multiple of the fixed frequency; wherein the primary controller sends an immediate sync signal and a multiplex message to the secondary controller for starting the pulse generator, a count of pulse generator pulses determining a secondary sampling moment synchronized with the primary sampling moment.
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Specification