Shift control strategy for use with an automated manual transmission coupled to a turbocharged internal combustion engine
First Claim
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.
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Accused Products
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.
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Citations
14 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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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:
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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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification