System and method for adaptive battery charge and discharge rates and limits on known routes

Patent metadata

Field	Value
Publication number	US-9266443-B2
Application number	US-201414231537-A
Country	US
Kind code	B2
Filing date	Mar 31, 2014
Priority date	Mar 31, 2014
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A system and a method for adaptively adjusting a charge and/or discharge rate and a limit of a battery based on a known driving route are described. The method includes storing, in a memory, a known driving route having a plurality of segments, where each segment has a corresponding discharge rate of the battery which was obtained from a previous trip of the vehicle along the same segment. The method also includes calculating, using a processor, an optimal discharge rate for the known driving route, and applying, using the processor, the optimal discharge rate of the vehicle to each segment of the route.

First claim

What is claimed is:

1. A method for adaptively adjusting a discharge rate of a battery based on a driving route of a vehicle, the method comprising:
storing, in a memory, a driving route having a plurality of segments and a plurality of discharge rates of the battery each corresponding to at least one of the plurality of segments and having been detected during a previous trip of the vehicle along the at least one of the plurality of segments;
detecting, by a GPS unit, a current location of the vehicle;
calculating, using a processor, an optimal discharge rate of the battery for the driving route that is different than a standard discharge rate of the battery and is based on the stored plurality of segments, the stored plurality of discharge rates and the current location of the vehicle; and
requesting, by the processor, the battery to discharge at the optimal discharge rate for at least one segment of the route.

2. The method of claim 1 wherein the optimal discharge rate is calculated to have a value similar to the discharge rate of the battery along a city segment of the driving route.

3. The method of claim 1 wherein the processor is further configured to calculate the optimal discharge rate to be a rate at which battery power may be provided constantly during the driving route.

4. The method of claim 1 further comprising:
selecting, using the processor, at least one candidate route;
assigning, using the processor, a route weight for each of the candidate routes; and
predicting, using the processor, a predicted route by selecting the candidate route with the highest route weight, wherein the predicted route is the driving route.

5. The method of claim 1 wherein the vehicle can operate in an electronic vehicle (EV) mode for the duration of the driving route when the battery is discharging at the optimal discharge route.

6. The method of claim 1 further comprising calculating, by the processor, a new optimal discharge rate during each of the plurality of segments based on a current state of charge and information stored in the memory that is associated with each of the plurality of segments that the vehicle has not yet traversed during the current trip along the route.

7. The method of claim 1 wherein the usable energy of the battery is nearly depleted upon completion of the driving route.

8. A method for adaptively adjusting a maximum discharge rate limit of a battery based on a driving route, the method comprising:
storing, in a memory:
a segment of a driving route associated with a high power request,
a duration of a power request of a battery during a previous trip of the vehicle along the segment, and
an amount of power requested from the battery during a previous trip of the vehicle along the segment;

detecting, by a GPS unit, a current location of the vehicle;
calculating, using a processor, a maximum discharge rate limit of the battery for the segment that is different than a standard discharge rate of the battery and is based on the stored segment, the stored duration of the power request, the stored amount of power requested from the battery and the current location of the vehicle; and
requesting, by the processor, the battery to discharge at a rate that is less than or equal to the maximum discharge rate limit while the vehicle is traveling along the segment.

9. The method of claim 8 wherein the maximum discharge rate limit for the segment is calculated such that the battery can discharge at or below the maximum discharge rate limit while the vehicle is traveling along the entire segment.

10. The method of claim 9 wherein the processor is further configured to calculate the maximum discharge rate limit to be a rate at which the battery will include sufficient charge to constantly discharge during a trip of the vehicle along the driving route.

11. The method of claim 10 wherein the maximum discharge rate limit is calculated based on battery values corresponding to battery protection limits.

12. The method of claim 8 wherein the maximum discharge rate limit is calculated such that the vehicle can complete the segment without engaging an engine of the vehicle.

13. The method of claim 8 wherein the maximum discharge rate limit is calculated based on a current state of charge of the battery.

14. The method of claim 8 , further comprising storing, by the memory:
a second segment of the driving route that is associated with another high power request;
a duration of a power request of the battery during a previous trip of the vehicle along the second segment; and
an amount of power requested from the battery during a previous trip of the vehicle along the second segment,
wherein the maximum discharge rate limit is further calculated based on the second stored segment, the stored duration of the power request corresponding to the second segment and the stored amount of power requested from the battery corresponding to the second segment.

15. The method of claim 8 further comprising:
selecting, using the processor, at least one candidate route;
assigning, using the processor, a route weight for each of the candidate routes;
predicting, using the processor, a predicted route by selecting the candidate route with the highest route weight, wherein the predicted route is the driving route.

16. A method for adaptively adjusting a maximum charge rate limit of a battery based on a driving route, the method comprising:
storing, in a memory:
a segment of a driving route associated with a high charging request,
a duration of a charging request of a battery during a previous trip of the vehicle along the segment, and
an amount of charging requested from the battery during a previous trip of the vehicle along the segment;

detecting, by a GPS, a current location of the vehicle;
calculating, using a processor, a maximum charge rate limit of the battery for the segment that is different than a standard charge rate of the battery and is based on the stored segment, the stored duration of the charging request, the stored amount of charging requested from the battery and the current location of the vehicle; and
requesting, by the processor, the battery to discharge at a rate that is less than or equal to the maximum discharge rate limit while the vehicle is traveling along the segment.

17. The method of claim 16 wherein the maximum charge rate limit for the segment is calculated such that the battery can charge at or below the maximum charge rate limit while the vehicle is traveling along the entire segment.

18. The method of claim 17 wherein the processor is further configured to calculate the maximum charge rate limit to be a rate at which the battery can constantly charge during a trip of the vehicle along the driving route.

19. The method of claim 16 wherein the processor is further configured to calculate the maximum charge rate limit based on values for a current state of charge of the battery and a charge threshold of the battery.

20. The method of claim 16 further comprising:
selecting, using a processor, at least one candidate route;
assigning, using the processor, a route weight for each of the candidate routes; and
predicting, using the processor, a predicted route by selecting the candidate route with the highest route weight, wherein the predicted route is the driving route.

21. A method for adaptively adjusting a discharge rate of a battery based on a known driving route of a vehicle, the method comprising:
selecting, using a processor, at l

Assignees

• Toyota Eng & Mfg North America

Inventors

• Payne Joshua D
• Dufford Mohammad E
• Fukushiro Eiji

Classifications

• Y10S903/903

  having energy storing means, e.g. battery, capacitor · CPC title

• G01C21/3461

  Preferred or disfavoured areas, e.g. dangerous zones, toll or emission zones, intersections, manoeuvre types or segments such as motorways, toll roads or ferries · CPC title

• G01C21/3469

  Fuel consumption; Energy use; Emission aspects · CPC title

• B60L11/1809

  Operations & Transport · mapped topic

• B60L11/1861 Primary

  Operations & Transport · mapped topic