Auxiliary Power Compensation During Map Testing

• US 20080264398A1
• Filed: 04/26/2007
• Published: 10/30/2008
• Est. Priority Date: 04/26/2007
• Status: Abandoned Application

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Schondorf, Steven Yellin, Shanahan, John, Gee, Tom Scott
• Application Number:
  US11/740,360
• Publication Number:
  US 20080264398A1
• Time in Patent Office: Days
• US Class Current: 123/674
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/445 Temperature
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 2510/0628 Inlet air flow rate
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0671 Engine manifold pressure
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/068 Engine exhaust temperature
• CPC Class Codes: B60W 2555/20 Ambient conditions, e.g. wind or rain
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: F02D 2250/24 by using an external load, e.g. a generator
• CPC Class Codes: F02D 41/2438 Active learning methods
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method for updating a map in a vehicle having an internal combustion engine and an auxiliary power source is provided. The method includes changing an input parameter; monitoring an actual output value corresponding to the changed input parameter; mapping the monitored actual output value to the changed input parameter; and compensating engine output with the auxiliary power source to account for changes to engine output resulting from changing the input parameter.

Claims

1. A method for operating a powertrain of a hybrid vehicle, the powertrain including an internal combustion engine, an auxiliary power source, and an energy storage device, the method comprising:

providing output torque from the powertrain responsive to a driver request, where both the auxiliary power source and the engine provide the output torque,

varying engine output relative to motor output in a coordinated common direction responsive to variation in the driver request in the common direction during a first operating mode; and

varying engine output relative to motor output in a opposite directions and independent from the driver request, while still providing the driver request, during a second operating mode, where engine performance is evaluated relative to a parameter during the second mode to learn variation in engine operation.

2. The method of claim 1 where during the second mode, engine operation is varied across a preselected range and varied independently from the driver request, where the auxiliary power source compensates for the engine variation, where engine calibration maps are updated based on the evaluation.

11. The method of claim 1, wherein the output parameters includes one of engine output torque, engine speed, fuel economy, and emissions, and wherein the auxiliary power source is a hybrid electric motor.

3. A method for updating a map in a vehicle, the vehicle including an internal combustion engine and an auxiliary power source, the method comprising:

changing an input parameter;

monitoring an actual output value corresponding to the changed input parameter;

mapping the monitored actual output value to the changed input parameter; and

compensating engine output with the auxiliary power source to account for changes to engine output resulting from changing the input parameter.

4. The method of claim 3, wherein the output value is engine output torque and/or a fuel efficiency.

5. The method of claim 4, wherein the input parameter is engine speed.

6. The method of claim 3, wherein input parameters are swept across a range of values;

actual output values are monitored and mapped to the corresponding input parameters, and the engine output is compensated throughout the range.

7. The method of claim 3, wherein mapping the monitored actual output value to the changed input parameter includes overwriting a previous map.

8. The method of claim 3, wherein mapping the monitored actual output value to the changed input parameter includes creating a new map in addition to a previous map.

9. The method of claim 3, wherein mapping the monitored actual output value to the changed input parameter includes creating correction factors that are applied to an original map.

10. The method of claim 3, wherein the input parameter includes one of fuel injection amount, fuel injection timing, spark timing, air/fuel ratio, boost pressure, and number of operating engine cylinders.

12. A method for updating a map in a vehicle, the vehicle including an internal combustion engine and an auxiliary power source, the method comprising:

determining a desired output value;

choosing an input parameter that is mapped to produce the desired output value;

monitoring an actual output value produced by the chosen input parameter;

changing the chosen input parameter to an adjusted input parameter; and

supplementing a vehicle output with the auxiliary power source to compensate for changes to engine output resulting from changing the chosen input parameter to the adjusted input parameter.

13. The method of claim 12, wherein the engine output is an engine output torque.

14. The method of claim 12, wherein the auxiliary power source is a hybrid electric motor.

15. The method of claim 12, further comprising mapping a tested input parameter that actually produces the desired output value to the desired output value.

16. The method of claim 15, wherein mapping the tested input parameter with the desired output value includes amending the data in the previous map.

17. The method of claim 15 further including updating a map in the vehicle, wherein the map is tested over measured environmental conditions, and where the updated based on engine output over the measured environmental conditions.