Vehicle inclination based battery state of charge target

Patent metadata

Field	Value
Publication number	US-2016243958-A1
Application number	US-201514628754-A
Country	US
Kind code	A1
Filing date	Feb 23, 2015
Priority date	Feb 23, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A hybrid vehicle includes a fraction battery, a powertrain coupled to the battery, and a controller or a battery management system having a controller. The controller is programmed to set a state of charge (SOC) target for the battery according to losses associated with the powertrain and an angle of inclination of the vehicle. The controller is programmed to respond to a SOC of the battery and a speed of the vehicle. When the SOC is greater than the target and the speed is greater than a threshold the controller is programmed to discharge the battery to achieve the target.

First claim

What is claimed is:

1 . A battery management system for a vehicle comprising:
a battery; and a controller programmed to set a state of charge (SOC) target for the battery according to an angle of inclination and speed of the vehicle, and in response to a SOC of the battery being greater than the target and the speed being greater than a threshold, discharge the battery to achieve the target.

2 . The system of claim 1 , wherein the controller is further programmed to set an engine shut-off threshold SOC based on a difference between a maximum operational SOC and an expected change in the SOC resulting from the angle of inclination and speed of the vehicle.

3 . The system of claim 1 further comprising a powertrain, wherein the controller is further programmed to alter the target based on losses associated with the powertrain.

4 . The system of claim 3 , wherein the losses are based on an operation time of the vehicle and an ambient temperature.

5 . The system of claim 3 , wherein the losses are based on historical drive cycle data.

6 . The system of claim 5 , wherein the historical drive cycle data includes road grade, vehicle kinetic energy and battery power.

7 . The system of claim 5 , wherein the historical drive cycle data further includes historical deceleration rates associated with a driver.

8 . The system of claim 5 , wherein the historical drive cycle data further includes at least one current flow profile associated with at least one auxiliary electrical load in the vehicle.

9 . The system of claim 5 , wherein the historical drive cycle data further includes vehicle route information.

10 . The system of claim 5 , wherein the historical drive cycle data further includes a battery power limit based on an ambient temperature and a battery life.

11 . The system of claim 1 , wherein the angle of inclination of the vehicle is based on wheel speed sensor output indicative of acceleration along a longitudinal plane of the vehicle and longitudinal accelerometer output indicative of acceleration along a horizontal plane.

12 . A method of operating a hybrid vehicle having a traction battery comprising:
setting by a controller a state of charge (SOC) target for the battery according to an angle of inclination and a speed of the vehicle; and discharging the battery by the controller in response to a SOC of the battery being greater than the target and the speed being greater than a threshold.

13 . The method of claim 12 , wherein the discharging includes turning off an engine and operating the vehicle by electricity.

14 . The method of claim 13 , wherein the angle of inclination of the vehicle is based on wheel speed sensor output indicative of acceleration along a longitudinal plane of the vehicle and longitudinal accelerometer output indicative of acceleration along the longitudinal plane.

15 . The method of claim 14 further including setting an engine shut-off threshold SOC based on a difference between a maximum operational SOC of the battery and a change in the SOC resulting from the speed and angle of inclination of the vehicle.

16 . The method of claim 14 , wherein the discharging includes activating at least one auxiliary load expected to be operated during a drive cycle.

17 . The method of claim 16 , wherein the at least one auxiliary load is a battery cooling fan, an electric air conditioning unit, a battery chiller, an electric heater, a cooling pump, or a cooling fan.

18 . A hybrid vehicle comprising:
a traction battery; a powertrain coupled to the battery; and a controller programmed to set a state of charge (SOC) target for the battery according to losses associated with the powertrain and an angle of inclination of the vehicle, and in response to a SOC of the battery being greater than the target and a speed of the vehicle being greater than a threshold, discharge the battery to achieve the target.

19 . The vehicle of claim 18 , wherein the angle of inclination of the vehicle is based on wheel speed sensor output indicative of vehicle acceleration along a longitudinal plane of the vehicle and longitudinal accelerometer output indicative of an acceleration along a horizontal plane.

20 . The vehicle of claim 18 , wherein the losses are based on an operation time of the vehicle and an ambient temperature.

Assignees

• Ford Global Tech Llc

Inventors

• Miller Kenneth James
• Martin Douglas Raymond
• Perkins William Paul
• Shen Stephen Li-Chun

Classifications

• B60L58/22 Primary

  Balancing the charge of battery modules · CPC title

• B60W2520/28

  Wheel speed · CPC title

• B60L2240/44

  related to combustion engines · CPC title

• B60W2520/105

  Longitudinal acceleration · CPC title

• B60L2240/12

  Speed · CPC title