Patent ID: 7843310

Claim:
A power management system, comprising: an in-vehicle device including an in-vehicle device controller that: transfers connection information to a power management device, the connection information indicating whether the in-vehicle device can communicate with the power management device; and transfers condition information to the power management device, the condition information indicating that the in-vehicle device is ready for turning off; or sets the in-vehicle device to not communicate with the power management device when a predetermined condition is met, the predetermined condition indicative of an inability of the in-vehicle device to transfer information to the power management device; and the power management device including a power management controller that: requests the connection information from the in-vehicle device; requests the condition information from the in-vehicle device; and determines that the in-vehicle device is ready for turning off when: both the connection information and the condition information have been received from the in-vehicle device; or no connection information has been received from the in-vehicle device because the in-vehicle device has been set to not communicate with the power management device.