为解决增程器介入时的噪音问题，该系统采用定位停缸等技术实现无感启停，将怠速发电时的车内噪音严格控制在 34 分贝以内。
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// if a register doesn't exist or its value is null, the map doesn't contain the key
# the setter use `call_soon_threadsafe` for cross-thread notification.