Power management within a vehicular communication network
Power management within a vehicle is achieved by maintaining individual and/or power island power saving options for each of a plurality of devices coupled to a vehicular communication network of the vehicle. Upon determining that power savings should be enabled for a device, at least one of the power saving options for the device is selected and applied.
1. A power management module within a vehicle, comprising:
a vehicle network interface operable to couple to an Ethernet link of an Ethernet vehicular communication network within the vehicle to provide power over the Ethernet link to a plurality of devices within the vehicle via the vehicular communication network;
a memory storing respective device power saving options for each of the plurality of devices coupled to the vehicular communication network of the vehicle, the memory further storing respective power island power saving options for each of a plurality of power islands, each of the power islands including two or more devices of the plurality of devices, each of the power island power savings options indicating a same power savings option to be applied to each of the two or more devices within the respective power island; and
a processing module for:
determining whether to enable power savings for a device of the plurality of devices based on operation of the vehicle and function of the device;
if power savings is enabled for the device, selecting and applying at least one of the device power saving options for the device via the vehicle network interface;
determining whether to enable power savings for a power island of the plurality of power islands based on operation of the vehicle and function of at least one device within the power island; and
if power savings is enabled for the power island, selecting and applying at least one of the power island power savings options to each of the two or more devices within the power island via the vehicle network interface.
2. The power management module of claim 1 , wherein the device power saving options for the device include one or more of: reducing a supply voltage to the device and limiting a current to the device.
3. The power management module of claim 1 , wherein the processing module determines whether to enable power savings based on a current state of the device.
4. The power management module of claim 3 , wherein the processing module further selects the device power saving options for the device based on the current state.
5. The power management module of claim 4 , wherein the current state is an idle state or an active state.
6. The power management module of claim 5 , wherein the active state further indicates one or more of a present operation of the device or a future operation of the device.
7. The power management module of claim 3 , wherein the device power saving options are preselected for the device based on one or more of a type of the device, one or more operations performed by the device and a location of the device within the vehicular communication network.
8. The power management module of claim 1 , wherein the vehicle network interface provides a wired connection to the vehicular communication network.
9. The power management module of claim 1 , wherein each of the plurality of power islands includes related devices, the related devices being related by one or more of device type, device function and device location within the vehicular communication network.
10. The power management module of claim 1 , wherein the device power saving options for the device include one or more of: reducing a clock rate of the device and using a lower power physical layer communication link for the device.
11. The power management module of claim 1 , wherein the device power saving options for the device include one or more of: placing the device in a sleep mode and disabling power to the device.
12. A method for managing power within a vehicle, using a power management module within the vehicle, comprising:
providing power over Ethernet to a plurality of devices within the vehicle via a vehicular communication network of the vehicle;
maintaining respective device power saving options for each of the plurality of devices coupled to the vehicular communication network of the vehicle;
maintaining respective power island power saving options for each of a plurality of power islands, each of the power islands including two or more devices of the plurality of devices, each of the power island power savings options indicating a same power savings option to be applied to each of the two or more devices within the respective power island;
determining whether to enable power savings for a device of the plurality of devices based on operation of the vehicle and function of the device;
if power savings is enabled for the device, selecting and applying at least one of the device power saving options for the device,
determining whether to enable power savings for a power island of the plurality of power islands based on operation of the vehicle and function of at least one device within the power island; and
if power savings is enabled for the power island, selecting and applying at least one of the power island power savings options to each of the two or more devices within the power island via the vehicle network interface.
13. A power management module within a vehicle, comprising:
a vehicle network interface operable to couple to an Ethernet link of an Ethernet vehicular communication network within the vehicle to provide power over the Ethernet link to a plurality of devices within the vehicle via the vehicular communication network;
a memory storing respective device power saving options for each of a plurality of devices coupled to the vehicular communication network of the vehicle and respective power island power saving options for each of a plurality of power islands, each of the power islands including two or more devices of the plurality of devices, each of the power island power savings options indicating a same power savings option to be applied to each of the two or more devices within the respective power island and each of the power island power saving options collectively controlling the power provided to each of the two or more devices within the respective power island; and
a processing module for:
determining whether to enable power savings for a device of the plurality of devices based on operation of the vehicle and function of the device; and
if power savings is enabled for the device, selecting and applying at least one of the device power saving options or at least one of the power island power saving options for the device via the vehicle network interface.
14. The power management module of claim 13 , wherein the processing module further:
determines whether the device belongs to a power island of the plurality of power islands;
if the device does belong to a power island, determines whether to enable power savings for the power island;
if power savings is enabled for the power island, selects and applies one of the power island power saving options for the power island; and
if power savings is not enabled for the power island, selects and applies one of the device power saving options for the device.
15. The power management module of claim 13 , wherein each of the plurality of power islands includes related devices, the related devices being related by one or more of device type, device function and device location within the vehicular communication network.
16. The power management module of claim 13 , wherein the device power saving options for the device include one or more of: placing the device in a sleep mode, reducing a supply voltage to the device, reducing a clock rate of the device, disabling power to the device, limiting a current to the device and using a lower power physical layer communication link for the device.
17. The power management module of claim 13 , wherein the power island power saving options for the power island include one or more of: placing each of the devices in the power island in a sleep mode, reducing a supply voltage to each of the devices in the power island, reducing a clock rate of each of the devices in the power island, disabling power to each of the devices in the power island, limiting a current to each of the devices of the power island and using a lower power physical layer communication link for each of the devices in the power island.
18. The power management module of claim 13 , wherein the processing module determines whether to enable power savings based on a current state of the device.
19. The power management module of claim 18 , wherein the processing module further selects one of the device power saving options or one of the power island power saving options based on the current state of one or more of the device and the power island, the current state indicating one or more of a present operation or a future operation thereof.
20. The power management module of claim 13 , wherein the power island power saving options are preselected for the power island based on one or more of device types of the devices within the power island, one or more operations performed by the devices within the power island and a location of the power island within the vehicular communication network.