SYSTEM ARCHITECTURE FOR A BLENDED BRAKING SYSTEM IN A HYBRID POWERTRAIN SYSTEM

• US 20090118885A1
• Filed: 10/24/2008
• Published: 05/07/2009
• Est. Priority Date: 11/04/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: BMW AG (Bayerische Motoren Werke AG), Daimler AG (Mercedes-Benz Group AG), GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust), Chrysler LLC (Stellantis NV)
• Inventors: Mcgrath, Seamus T., Heap, Anthony H., Cawthorne, William R., Karnjate, Timothy M., Manosh, William K.
• Granted Patent: US 8,594,867 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60T 2270/604 Merging friction therewith; Adjusting their repartition
• 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 10/105 of electric type
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 2510/104 Output speed
• CPC Class Codes: B60W 2510/107 Temperature
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/18109 Braking
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: F16H 2037/106 with switching means to provide two variator modes or ranges
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

An engine and a second power generating device transmit power through a transmission to a driveline to a wheel. A control module determines a regenerative braking axle torque capacity and a regenerative braking torque. Power output from the second power generating device is controlled based upon a regenerative braking axle torque request. A brake control module determines a total braking torque request and generates the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque. The brake control module controls a friction brake.

Claims

1. Apparatus, comprising:

an internal combustion engine mechanically coupled to a transmission device operative to transfer mechanical power between the engine and a second power generating device and an output member mechanically coupled to a driveline to transmit tractive torque to a wheel including an actuable friction brake;

a brake control module operatively connected to the actuable friction brake;

a second control module operatively connected to the internal combustion engine and the transmission device; and

a brake pedal;

the second control module configured to

determine a regenerative braking axle torque capacity,

determine a regenerative braking torque presently applied to the driveline through the output member of the transmission device,

communicate the regenerative braking axle torque capacity and the regenerative braking torque to the brake control module, and

generate a control signal to command a power output from the second power generating device based upon a regenerative braking axle torque request;

the brake control module configured to

determine a total braking torque request based upon an operator input to the brake pedal,

generate the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque, and

generate a control signal to control the actuable friction brake based upon the total braking torque request and the regenerative braking torque.

2. The apparatus of claim 1, further comprising the second control module configured to generate a control signal to command a power output from the second power generating device based upon a regenerative braking axle torque that can be reacted through the transmission.

3. The apparatus of claim 2, wherein the regenerative braking axle torque further comprises the presently applied torque reacted from the second power generating device through the transmission to the driveline.

4. The apparatus of claim 3, further comprising the transmission including a selectively applied clutch and the regenerative braking axle torque capacity determined based upon a reaction torque transmitted between the second power generating device through the selectively applied clutch to the output member.

5. The apparatus of claim 1, wherein the regenerative braking axle torque request comprises an immediate brake output torque request.

6. The apparatus of claim 1, wherein the regenerative braking axle torque request comprises a predicted brake output torque request.

7. The apparatus of claim 1, further comprising the brake control module configured to monitor a speed of the wheel and configured to phase out the regenerative braking axle torque request when the speed of the wheel approaches zero torque.

8. The apparatus of claim 7, further comprising the brake control module configured to set the regenerative braking axle torque request to zero torque when a gear selector switch is set to a reverse gear.

9. Apparatus, comprising:

an internal combustion engine;

an electric machine;

a transmission device including selectively applied clutches and an output member;

the internal combustion engine and the electric machine mechanically coupled to the transmission device;

the output member mechanically coupled to a driveline;

the driveline including a wheel including an actuable friction brake;

the transmission configured to react torque from the driveline to the output member through the selectively applied clutches to the electric machine;

a brake control module operatively connected to the actuable friction brake;

a second control module operatively connected to the internal combustion engine and the transmission; and

a brake pedal;

the second control module configured to

determine a regenerative braking axle torque capacity,

determine a magnitude of torque reacted from the driveline to the output member of the transmission device,

communicate the regenerative braking axle torque capacity and the magnitude of the torque reacted from the driveline to the brake control module, and

generate a control signal to command a power output from the electric machine based upon a regenerative braking axle torque request;

the brake control module configured to

determine a total braking torque request based upon an operator input to the brake pedal,

generate the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the magnitude of the reacted torque, and

generate a control signal to control the actuable friction brake based upon the total braking torque request and the magnitude of the reacted torque.

10. The apparatus of claim 9, further comprising the second control module configured to generate a control signal to command a power output from the electric machine based upon a regenerative braking axle torque that can be reacted through the transmission.

11. The apparatus of claim 10, wherein the regenerative braking axle torque further comprises the presently applied torque reacted from the electric machine through the transmission to the driveline.

12. The apparatus of claim 11, further comprising the regenerative braking axle torque capacity determined based upon a reaction torque transmitted from the electric machine through the selectively applied clutch to the output member.

13. The apparatus of claim 9, wherein the regenerative braking axle torque request comprises an immediate brake output torque request.

14. The apparatus of claim 9, wherein the regenerative braking axle torque request comprises a predicted brake output torque request.

15. The apparatus of claim 9, further comprising the brake control module configured to monitor a speed of the wheel and configured to phase out the regenerative braking axle torque request when the speed of the wheel approaches zero torque.

16. The apparatus of claim 15, further comprising the brake control module configured to set the regenerative braking axle torque request to zero torque when a gear selector switch is set to a reverse gear.

17. The apparatus of claim 9, further comprising

the electric machine operative to transform the torque reacted from the driveline to electric power;

and

an energy storage device connected to the electric machine operative to store the electric power as electric energy potential.

18. A method to operate a powertrain system including an engine mechanically coupled to a transmission and a power generating device electrically connected to an energy storage device, the transmission operative to transfer mechanical power between the engine and the power generating device and an output member coupled to a driveline to transmit tractive torque to a wheel, the wheel including an actuable friction brake and the power generating device operative to react tractive torque transferred from the wheel through the driveline to the transmission, the method comprising:

monitoring an operator input to a brake pedal with a first control module;

determining a regenerative braking axle torque capacity with a second control module;

determining a regenerative braking torque transmitted between the driveline and the output member of the transmission device with the second control module;

communicating the regenerative braking axle torque capacity and the regenerative braking torque to the first control module; and

,

generating a control signal to command a power output from the second power generating device based upon a regenerative braking axle torque request with the second control module;

determining a total braking torque request based upon the operator input to the brake pedal with the first control module;

generating the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque with the first control module;

generating a control signal to control the actuable friction brake based upon the total braking torque request and the regenerative braking torque with the first control module.

19. The method of claim 18, further comprising

connecting an energy storage device to the electric machine;

transforming the regenerative braking torque transmitted between the driveline and the output member of the transmission device to electric power; and

storing the electric power as electric energy potential.