Drive Motor Generator Battery Control Module Power Limit Capability
The battery energy control module (BECM) communicates the amount of power available from the drive motor generator battery for use by the hybrid system and also the amount of charge power allowed back to the drive motor generator battery from the hybrid system. This information is sent over on the GMLAN communications network to the hybrid powertrain control module (HPCM).
The BECM can adjust these power limits either based on hybrid battery temperature, hybrid battery voltage or DTC information.
The HPCM compares the BECM power limit capability to a similar value calculated in the HPCM and uses the lower of the 2 values to control the power.
Under normal operation the BECM will communicate both the available charge power and available discharge power limits according to the following power limit table based upon the maximum hybrid battery temperature.
| Battery Temperature °C (°F) | Drive Motor Generator Battery Power Limit Capability | |
|---|---|---|
| Available Discharge Power Limit in Watts | Available Charge Power Limit in Watts | |
| Less than or equal to -40°C (-40°F) | 30002 | -30002 |
| -30°C (-22°F) | 5000 | -5000 |
| -25°C (-13°F) | 5000 | -5000 |
| -20°C (-4°F) | 6000 | -6000 |
| -10°C (14°F) | 8000 | -8000 |
| 0°C (32°F) | 13000 | -13000 |
| 18°C (64°F)1 | 250001 | -220001 |
| 22°C (72°F)1 | 300001 | -320001 |
| 42°C (108°F)1 | 300001 | -320001 |
| 46°C (115°F) | 16000 | -16000 |
| 48°C (118°F) | 10000 | -10000 |
| 50°C (122°F) | 6000 | -5500 |
| 52°C (126°F) | 4500 | -4500 |
| 56°C (133°F) | 30002 | -30002 |
| 60°C (140°F) | 30002 | -30002 |
| 70°C (158°F) | 30002 | -30002 |
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Optimal Hybrid Performance 2 Minimal Hybrid Functions |
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