System and method for improved battery pre-charge and deactivation timing in traffic

• US 10,118,604 B1
• Filed: 07/07/2017
• Issued: 11/06/2018
• Est. Priority Date: 07/07/2017
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Wrobel, Shannon A., Payne, Joshua D.
• Primary Examiner(s): Paige, Tyler D
• Application Number:
  US15/644,319
• Time in Patent Office: 487 Days
• Field of Search: 701 22
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 20/12 using control strategies taking into account route information estimation or calculation of non-directly measurable driving parameters B60W40/00
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/14 in conjunction with braking regeneration
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2554/00 Input parameters relating to objects
• CPC Class Codes: B60W 2556/45 External transmission of data to or from the vehicle
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2710/18 Braking system
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 2720/10 Longitudinal speed
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: G01C 21/3469 : Fuel consumption; Energy use; Emission aspects
• CPC Class Codes: G01C 21/3492 : employing speed data or traffic data, e.g. real-time or historical traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968
• CPC Class Codes: G01S 19/14 : specially adapted for specific applications
• CPC Class Codes: G01S 19/42 : Determining position
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

Methods, systems, and apparatus for managing energy efficiency of a vehicle. The system includes a GPS unit configured to detect a current location of the vehicle. The system includes a network access device configured to receive traffic data. The system includes a navigation unit configured to determine whether traffic is upcoming along a route based on the traffic data. The system includes a speed sensor configured to detect a current speed of the vehicle. The system includes an electronic control unit configured to activate a pre-charge mode when the upcoming slowdown in vehicle speed is determined, the pre-charge mode causing the engine to charge the battery via the motor/generator. The electronic control unit is configured to deactivate the pre-charge mode to prevent charging of the battery by the engine when the detected current speed of the vehicle is below a speed threshold for a set period of time or distance.

Claims

1. A system for managing energy efficiency of a vehicle having an engine, a motor/generator, and a battery, the system comprising:

a GPS unit configured to detect a current location of the vehicle;

a network access device configured to receive traffic data from a remote data server, the traffic data including locations and vehicle speeds at the locations;

a navigation unit connected to the GPS unit and configured to determine a route to a destination and determine whether a slowdown in vehicle speed is upcoming along the route based on the traffic data;

a speed sensor configured to detect a current speed of the vehicle;

a battery sensor configured to detect a current state of charge of the battery; and

an electronic control unit connected to the navigation unit, the speed sensor, and the battery sensor, the electronic control unit configured to;

activate a pre-charge mode when the navigation unit detects an upcoming slowdown in vehicle speed based on the traffic data, the pre-charge mode causing the engine to charge the battery via the motor/generator, and

deactivate the pre-charge mode to prevent charging of the battery by the engine when the detected current speed of the vehicle is below a speed threshold for a set period of time or distance.

2. The system of claim 1, wherein the electronic control unit is further configured to temporarily re-activate the pre-charge mode when the current state of charge of the battery is below a lower state of charge threshold until the current state of charge of the vehicle exceeds an upper state of charge threshold.

3. The system of claim 1, wherein the electronic control unit is further configured to re-activate the pre-charge mode when the navigation unit detects a second upcoming slowdown in vehicle speed.

4. The system of claim 1, further comprising a brake pedal sensor configured to detect brake pedal data and an accelerator pedal sensor configured to detect accelerator pedal data, and

wherein the electronic control unit is connected to the brake pedal sensor and the accelerator pedal sensor and further configured to deactivate the pre-charge mode based on the brake pedal data and the accelerator pedal data indicating brief periods of braking alternating with brief periods of accelerating.

5. The system of claim 1, further comprising an inertial measurement unit configured to detect a deceleration of the vehicle, and

wherein the electronic control unit is connected to the inertial measurement unit and further configured to deactivate the pre-charge mode when the deceleration of the vehicle exceeds a deceleration threshold and the detected current speed of the vehicle is below the speed threshold for the set period of time or distance.

6. The system of claim 1, further comprising a proximity sensor configured to detect proximity data of objects including other vehicles, and

wherein the electronic control unit is connected to the proximity sensor and configured to deactivate the pre-charge mode when the proximity data indicates other vehicles within a threshold proximity to the vehicle for a set period of time.

7. The system of claim 1, wherein the navigation unit is further configured to detect whether the vehicle has reached an end of the slowdown in vehicle speed, and

wherein the electronic control unit is further configured to deactivate the pre-charge mode when the vehicle has reached the end of the slowdown in vehicle speed.

8. A hybrid vehicle having an engine, a motor/generator, and a battery, the hybrid vehicle comprising:

a GPS unit configured to detect a current location;

a network access device configured to receive traffic data from a remote data server, the traffic data including locations and vehicle speeds at the locations;

a navigation unit connected to the GPS unit and configured to determine a route to a destination and determine whether a slowdown in vehicle speed is upcoming along the route based on the traffic data;

a speed sensor configured to detect a current speed;

a battery sensor configured to detect a current state of charge of the battery; and

an electronic control unit connected to the navigation unit, the speed sensor, and the battery sensor, the electronic control unit configured to;

activate a pre-charge mode when the navigation unit detects an upcoming slowdown in vehicle speed, the pre-charge mode causing the engine to charge the battery via the motor/generator, and

deactivate the pre-charge mode to prevent charging of the battery by the engine when the detected current speed is below a speed threshold for a set period of time or distance.

9. The hybrid vehicle of claim 8, wherein the electronic control unit is further configured to temporarily re-activate the pre-charge mode when the current state of charge of the battery is below a lower state of charge threshold until the current state of charge of the vehicle exceeds an upper state of charge threshold.

10. The hybrid vehicle of claim 8, wherein the electronic control unit is further configured to re-activate the pre-charge mode when the navigation unit detects a second upcoming slowdown in vehicle speed.

11. The hybrid vehicle of claim 8, further comprising a brake pedal sensor configured to detect brake pedal data and an accelerator pedal sensor configured to detect accelerator pedal data, and

wherein the electronic control unit is connected to the brake pedal sensor and the accelerator pedal sensor and further configured to deactivate the pre-charge mode based on the brake pedal data and the accelerator pedal data indicating brief periods of braking alternating with brief periods of accelerating.

12. The hybrid vehicle of claim 8, further comprising an inertial measurement unit configured to detect a deceleration, and

wherein the electronic control unit is connected to the inertial measurement unit and further configured to deactivate the pre-charge mode when the deceleration exceeds a deceleration threshold and the detected current speed is below the speed threshold for the set period of time or distance.

13. The hybrid vehicle of claim 8, further comprising a proximity sensor configured to detect proximity data of objects including other vehicles, and

wherein the electronic control unit is connected to the proximity sensor and configured to deactivate the pre-charge mode when the proximity data indicates other vehicles within a threshold proximity for a set period of time.

14. The hybrid vehicle of claim 8, wherein the navigation unit is further configured to detect whether an end of the slowdown in vehicle speed has been reached, and

wherein the electronic control unit is further configured to deactivate the pre-charge mode when the end of the slowdown in vehicle speed has been reached.

15. A method for managing energy efficiency of a vehicle having an engine, a motor/generator, and a battery, the method comprising:

detecting, by a GPS unit, a current location of the vehicle;

receiving, by a network access device, traffic data from a remote data server, the traffic data including locations and vehicle speeds at the locations;

determining, by a navigation unit connected to the GPS unit, a route to a destination and determine whether a slowdown in vehicle speed is upcoming along the route based on the traffic data;

detecting, by a speed sensor, a current speed of the vehicle;

detecting, by a battery sensor, a current state of charge of the battery;

activating, by an electronic control unit, a pre-charge mode when the upcoming slowdown in vehicle speed is determined by the navigation unit, the pre-charge mode causing the engine to charge the battery via the motor/generator; and

deactivating, by the electronic control unit, the pre-charge mode to prevent charging of the battery by the engine when the detected current speed of the vehicle is below a speed threshold for a set period of time or distance.

16. The method of claim 15, further comprising temporarily re-activating, by the electronic control unit, the pre-charge mode when the current state of charge of the battery is below a lower state of charge threshold until the current state of charge of the vehicle exceeds an upper state of charge threshold.

17. The method of claim 15, further comprising re-activating, by the electronic control unit, the pre-charge mode when the navigation unit detects a second upcoming slowdown in vehicle speed.

18. The method of claim 15, further comprising:

detecting, by a brake pedal sensor, brake pedal data;

detecting, by an accelerator pedal sensor, accelerator pedal data; and

deactivating, by the electronic control unit, the pre-charge mode based on the brake pedal data and the accelerator pedal data indicating brief periods of braking alternating with brief periods of accelerating.

19. The method of claim 15, further comprising detecting, by an inertial measurement unit, a deceleration of the vehicle;

and

deactivating, by the electronic control unit, the pre-charge mode when the deceleration of the vehicle exceeds a deceleration threshold and the detected current speed of the vehicle is below the speed threshold for the set period of time or distance.

20. The method of claim 15, further comprising:

detecting, by the navigation unit, whether the vehicle has reached an end of the slowdown in vehicle speed; and

deactivating, by the electronic control unit, the pre-charge mode when the vehicle has reached the end of the slowdown in vehicle speed.