Method and apparatus for remediation of and recovery from a clutch slip event in a hybrid powertrain system
First Claim
1. A method for operating a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, wherein a microprocessor performs the following steps:
- monitoring slip across a selectively applied clutch within said transmission to indicate a clutch slip event; and
when said monitoring indicates said clutch slip event, initiating a slip remediation response comprising;
imposing a limit upon a magnitude of torque permitted from said engine and a magnitude of torque permitted from said electric machine; and
progressively reducing said magnitudes based upon said monitored slip indicating a continuing slip event, in order to reduce said slip, thereby ending said clutch slip event, including a delaying command to said electric machine in comparison to a command to said engine, anticipating response lag in said engine as compared to said electric machine, so as to effect said limit upon said engine and said electric machine torques with simultaneous torque reductions.
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Accused Products
Abstract
A method for operating a powertrain, including an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, includes monitoring slip across a selectively applied clutch within the transmission to indicate a clutch slip event, and if the monitoring indicates the clutch slip event decreasing a load across the selectively applied clutch by reducing torque of at least one of the engine and the electric machine, in order to reduce the slip, thereby ending the clutch slip event.
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Citations
18 Claims
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1. A method for operating a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, wherein a microprocessor performs the following steps:
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monitoring slip across a selectively applied clutch within said transmission to indicate a clutch slip event; and when said monitoring indicates said clutch slip event, initiating a slip remediation response comprising; imposing a limit upon a magnitude of torque permitted from said engine and a magnitude of torque permitted from said electric machine; and progressively reducing said magnitudes based upon said monitored slip indicating a continuing slip event, in order to reduce said slip, thereby ending said clutch slip event, including a delaying command to said electric machine in comparison to a command to said engine, anticipating response lag in said engine as compared to said electric machine, so as to effect said limit upon said engine and said electric machine torques with simultaneous torque reductions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for operating a powertrain comprising an electro-mechanical transmission adapted to selectively transmit mechanical power to an output member through selective application of a plurality of clutches, wherein said transmission is mechanically-operatively coupled to an internal combustion engine and a plurality of electric motors, wherein a microprocessor performs the following steps:
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monitoring clutch slip across each selectively applied clutch; and when said monitoring indicates clutch slip in excess of a threshold clutch slip level through a slip detection period, initiating a slip remediation response comprising; limiting a magnitude of torque permitted from said engine transmitted through said clutches and limiting a magnitude of torque permitted from said electric motors transmitted through said clutches; and progressively reducing said magnitudes based upon said monitored clutch slip indicating a continuing slip event, in order to reduce said slip, thereby ending said clutch slip event. - View Dependent Claims (13, 14)
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15. Apparatus for operating a powertrain comprising an electro-mechanical transmission adapted to selectively transmit mechanical power to an output member through selective application of a plurality of clutches, wherein said transmission is mechanically-operatively coupled to an internal combustion engine and a plurality of electric machines, the apparatus comprising:
a control system monitoring slip across said clutches and including logic diagnosing a slip event in each clutch and imposing torque constraints upon said engine and said electric machines based upon said diagnosis, said constraints being effective to reduce a load upon said clutch and eliminate said excessive slip; and
,as long as said slip event remains, logic progressively decreasing torque permitted from said engine and said electric machines in order to reduce said slip, thereby ending said slip event. - View Dependent Claims (16, 17, 18)
Specification