Method of power management for a hybrid powertrain system

• US 5,999,864 A
• Filed: 04/23/1997
• Issued: 12/07/1999
• Est. Priority Date: 04/23/1997
• Status: Expired due to Term

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Chrysler Corporation (Stellantis NV)
• Inventors: Buglione, Arthur J., Thiel, O. Kent
• Primary Examiner(s): Dombroske, George M.
• Application Number:
  US08/839,121
• Time in Patent Office: 958 Days
• Field of Search: 73/116, 73/117.2, 73/117.3, 73/118.1, 701/22-35
• US Class Current: 701/22
• CPC Class Codes: B60K 6/30 characterised by chargeable mechanical accumulators, e.g. flywheels
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 50/13 using AC generators and AC motors
• CPC Class Codes: B60L 50/30 using propulsion power stored mechanically, e.g. in fly-wheels
• 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 10/26 for electrical energy, e.g. batteries or capacitors
• 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 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60Y 2200/114 Racing vehicles, e.g. Formula one, Karts
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y10S 903/96 having chargeable mechanical accumulator

Abstract

A method of power management for a hybrid powertrain system includes the step of determining a storage power from a power flow into or out of an energy storage apparatus. The method also includes the step of determining an actual level of energy stored in the energy storage apparatus, determining a desired level of energy stored in the energy storage apparatus, and determining an energy storage level error from a difference between the desired level of energy stored and the actual level of energy stored. The method further includes the step of determining an engine power change from the energy storage level error and an actual storage power flow, determining an engine power setting from the engine power change, and modifying the engine by the engine power setting.

Claims

1. A method of power management control for a hybrid powertrain system, said method comprising the steps of:

determining a storage power from a power flow into or out of an energy storage apparatus;

determining an actual level of energy stored in the energy storage apparatus;

determining a desired level of energy stored in the energy storage apparatus;

determining an energy storage level error from a difference between the desired level of energy stored and the actual level of energy stored;

determining an engine power change from the energy storage level error and an actual storage power flow by calculating a power level error as a function of the energy storage level error and an actual storage power flow error;

calculating and engine power setting based upon the engine power change; and

modifying an engine power output by the engine power setting.

2. A method as set forth in claim 1 including the step of determining an engine power output.

3. A method as set forth in claim 1 wherein the desired level of energy stored is instantaneously determined from an energy storage capacity in the energy storage apparatus and a vehicle speed.

4. A method as set forth in claim 1 wherein the actual storage power flow error comprises multiplying an actual storage power flow into or out of an energy storage apparatus by a predetermined efficiency value.

5. A method as set forth in claim 4 wherein the actual storage power flow is determined from the engine power setting and a power need of a power user.

6. A method as set forth in claim 5 wherein the power user is a traction motor.

7. A method as set forth in claim 5 wherein the actual level of energy stored is determined using the actual storage power flow.

8. A method of power management control for a hybrid powertrain system, said method comprising the steps of:

determining a storage power from a power flow into or out of an energy storage apparatus;

determining an actual level of energy stored in the energy storage apparatus;

determining a desired level of energy stored in the energy storage apparatus;

determining an energy storage level error by taking a difference between the desired level of energy stored and the actual level of energy stored;

determining a power level error using the energy storage level error and an actual storage power flow error;

determining an engine power change based upon the power flow error;

calculating a desired engine power setting from the engine power change;

calculating a power output of the engine based upon the desired engine power setting; and

modifying the engine power output by the desired engine power setting.

9. A method as set forth in claim 8 wherein the desired level of energy stored is instantaneously determined from an energy storage capacity in the energy storage apparatus and a vehicle speed.

10. A method as set forth in claim 8 wherein the actual storage power flow error comprises multiplying an actual storage power flow into or out of an energy storage apparatus by a predetermined efficiency value.

11. A method as set forth in claim 8 wherein the actual storage power flow is determined using the desired engine power setting and a power need of a power user.

12. A method as set forth in claim 11 wherein the power user is a traction motor.

13. A method as set forth in claim 11 wherein the actual level of energy stored is determined using the actual storage power flow.

14. A method of power management control for a hybrid powertrain system, said method comprising the steps of:

determining an actual storage power flow into or out of an energy storage apparatus using an engine power setting and a power need of a power user;

determining an actual level of energy stored in the energy storage apparatus using the actual storage power flow;

determining a desired level of energy stored in the energy storage apparatus using an energy storage capacity in the energy storage apparatus and a vehicle speed;

determining an energy storage level error by taking a difference between the desired level of energy stored and the actual level of energy stored;

determining an actual storage power flow error by multiplying the actual storage power flow by a predetermined efficiency value;

determining a power level error using the energy storage level error and the actual storage power flow error;

determining an engine power change from the power level error;

determining an engine power setting from the engine power change; and

modifying the engine power output by the engine power setting.

15. A method as set forth in claim 14 including the step of determining a power output of the engine.

16. A method as set forth in claim 14 wherein the power user is a traction motor.