Although much of the chat surrounding the new BMW 7 Series has focused on its looks, the firm's electric drive technology continues to evolve underneath that controversial skin
, which is based on the idea of using navigation data to optimise the regenerative braking system on the fly as road conditions change. The existing system tweaks the level of regen for more or less retardation, or lets the car coast when the driver lifts off, a strategy generally considered more effective on open roads.
For the i7, this feature also takes downhill sections into account and draws on the traffi c light recognition function to make the most of the energy recovery. The whole system still works even if the driver isn’t using the sat-nav. Charging strategies have also been tuned so that the amount of cooling delivered to the battery varies during a rapid charge to ensure cell temperatures don’t drop too much, as well as preventing them from climbing too high.
If the driver is approaching a familiar rapid charge point without the car ‘knowing’ a charging stop is planned via the sat-nav, battery pre-heat can be selected manually, warming the battery cells to the level needed for the fastest charge to be accepted from the off. Before this type of pre-heat function, a cool battery would need to be brought up to temperature after charging started, taking longer.
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