Shift control strategy for use with an automated manual transmission coupled to a turbocharged internal combustion engine

• US 6,692,406 B2
• Filed: 08/23/2002
• Issued: 02/17/2004
• Est. Priority Date: 08/29/2001
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: Beaty, Kevin D.
• Primary Examiner(s): Bonck, Rodney H.
• Assistant Examiner(s): ABDELNOUR, DENNIS J
• Application Number:
  US10/226,389
• Publication Number:
  US 20030060328A1
• Time in Patent Office: 543 Days
• Field of Search: 477/32, 477/33, 477/100, 477/107, 477/109, 606/08
• US Class Current: 477/32
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2710/0605 Throttle position
• CPC Class Codes: B60W 2710/0616 Position of fuel or air injector
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: B60Y 2400/435 Supercharger or turbochargers
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2250/22 by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/10 for acceleration
• CPC Class Codes: F16H 2306/42 Changing the input torque to the transmission
• CPC Class Codes: F16H 61/682 with interruption of drive
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

The present invention discloses a method for controlling up-shifting of multiple speed change gear transmission used with a turbocharged internal combustion engine. One or more engine operating parameters are selected for control by the control unit. The control unit establishes that an up-shift is about to occur. The engine is placed in a transient operating mode. The transient operating mode includes the steps of reducing a magnitude of at least one of the engine speed and the engine torque to enable shifting from a first gear, and modulating the selected engine operating parameter to maintain the boost pressure by one of increasing the exhaust energy and maintaining the rotational speed of the turbocharger while the magnitude of the at least one of the engine speed and the engine torque is reduced. The control unit establishes that the shift from the first gear has been completed. Upon establishing that the shift from first gear has been completed, the engine is returned to the full-load condition while the selected engine parameter is immediately modulated so as to maintain or increase the torque output of the engine after the shift from the first gear, and the modulation of the selected engine parameter is coordinated with the shifting of the transmission to decrease the turbocharger lag associated with shifting and to thereby increase a power output of the engine substantially immediately upon completion of the up-shift.

Claims

1. A method for controlling up-shifting of a vehicular powertrain system (10) used with a turbocharged internal combustion engine (12) operating in a maximum foot pedal position and in an associated full-load condition, the powertrain system including a multiple speed change-gear transmission and a control unit for controlling the engine and the transmission, the method comprising:

selecting one or more engine operating parameters to be controlled by the control unit, the engine operating parameters including fuel injection timing, fuel injection rate, fuel injection pressure, turbocharger wastegate controller valve setting, intake air throttle setting, variable geometry turbocharger vane position setting, engine valve timing setting, engine valve activation state;

establishing that an up-shift is about to occur from a first gear to a second gear;

upon establishing that an up-shift is about to occur, placing the engine in a transient shift operating mode which includes the steps of;

reducing a magnitude of at least one of the engine speed and the engine torque to enable shifting from the first gear, and simultaneously modulating the selected engine operating parameter to maintain the boost pressure by at least one of increasing the exhaust energy and maintaining the rotational speed of the turbocharger;

establishing that the shift from the first gear has been completed;

upon establishing that the shift from the first gear has been completed;

returning engine to the full-load condition, while also

immediately modulating the selected engine parameter so as to increase the torque output of the engine, and

coordinating the modulation of the selected engine parameter with the shifting of the transmission to resultantly at least one of;

decrease the turbocharger lag associated with shifting and to thereby decrease a power output response time of the engine, and

reduce exhaust emissions during shifting events.

2. A method as claimed in claim 1, further comprising the step of executing the shift from the first gear to the second gear using a shift actuator responsive to a control signal from the controller.

3. A method as claimed in claim 1, wherein the selected engine operating parameter is the turbocharger vane position setting.

4. A method as claimed in claim 1, wherein the selected engine operating parameter is the turbocharger wastegate controller valve setting.

5. A method as claimed in claim 1, wherein the selected engine operating parameter is the fuel injection timing setting.

6. A method as claimed in claim 1, wherein the selected engine operating parameter is the fuel injection rate setting.

7. A method as claimed in claim 1, wherein the selected engine operating parameter is the fuel injection pressure setting.

8. A control system for controlling up-shifting of a vehicular powertrain system using a turbocharged internal combustion engine operating in a maximum foot pedal position and in an associate full-load condition, the powertrain system including a multiple speed change-gear transmission and a control unit for controlling both the engine and the transmission, the control unit having logic rules effective for:

establishing that an up-shift is about to occur from a first gear to a second gear;

upon establishing that an up-shift is about to occur, placing the engine in a transient shift operating mode which includes the steps of;

reducing a magnitude of at least one of the engine speed and the engine torque to enable shifting from the first gear, and

modulating a selected engine operating parameter to maintain the boost pressure by at least one of increasing the exhaust energy and maintaining the rotational speed of the turbocharger while the magnitude of the at least one of the engine speed and the engine torque is reduced, the selected engine operating parameter being chosen from a plurality of parameters including;

fuel injection timing, fuel injection rate, fuel injection pressure, turbocharger wastegate controller valve setting, intake air throttle setting, variable geometry turbocharger vane position setting, engine valve timing setting, engine valve activation state;

establishing that the shift from the first gear has been completed;

upon establishing that the shift from the first gear has been completed;

returning the engine to full load-condition, while also

immediately modulating the selected engine operating parameter so as to increase the torque output of the engine, and

coordinating the modulation of the selected engine parameter with the shifting of the transmission to at least one of;

decrease the turbocharger lag associated with shifting and to thereby decrease a power output response time of the engine, and

reduce exhaust emissions during shifting events.

9. A system is claimed in claim 8, further comprising the step of executing the shift from the first gear to the second gear using a shift actuator responsive to a control signal from the controller.

10. A system as claimed in claim 8, wherein the selected engine operating parameter is the vane position setting.

11. A system as claimed in claim 8, wherein the selected engine operating parameter is the turbocharger wastegate controller valve setting.

12. A system as claimed in claim 8, wherein the selected engine operating parameter is the fuel injection timing setting.

13. A system as claimed in claim 8, wherein the selected engine operating parameter is the fuel injection rate setting.

14. A system as claimed in claim 8, wherein the selected engine operating parameter is the fuel injection pressure setting.