METHOD AND APPARATUS TO OFFLOAD OFFGOING CLUTCH TORQUE WITH ASYNCHRONOUS ONCOMING CLUTCH TORQUE, ENGINE AND MOTOR TORQUE FOR A HYBRID POWERTRAIN SYSTEM
First Claim
1. Method for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said method comprising:
- commanding a shift from a first operating range state to a second operating range state;
identifying an off-going clutch;
controlling torque output from said electric machine to offload reactive torque transmitted through said off-going clutch;
selectively applying an oncoming clutch to offload reactive torque transmitted through said off-going clutch; and
reducing a clutch torque capacity of said off-going clutch when said reactive torque transmitted through said off-going clutch is substantially zero.
17 Assignments
0 Petitions
Accused Products
Abstract
A powertrain includes an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member. A method for controlling the powertrain includes commanding a shift from a first operating range state to a second operating range state, identifying an off-going clutch, controlling torque output from said electric machine to offload reactive torque transmitted through said off-going clutch, selectively applying an oncoming clutch to offload reactive torque transmitted through said off-going clutch, and reducing a clutch torque capacity of said off-going clutch when said reactive torque transmitted through said off-going clutch is substantially zero.
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Citations
15 Claims
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1. Method for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said method comprising:
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commanding a shift from a first operating range state to a second operating range state; identifying an off-going clutch; controlling torque output from said electric machine to offload reactive torque transmitted through said off-going clutch; selectively applying an oncoming clutch to offload reactive torque transmitted through said off-going clutch; and reducing a clutch torque capacity of said off-going clutch when said reactive torque transmitted through said off-going clutch is substantially zero. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method for controlling 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, said method comprising:
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initiating a shift event comprising identifying an off-going clutch to be synchronously offloaded, and identifying an oncoming clutch to be loaded; monitoring an electric machine torque capability to offload said off-going clutch; determining a torque required to assist said electric machine to offload said off-going clutch; applying torque with said electric machine to offload said off-going clutch; and selectively applying torque through said oncoming clutch based upon said torque required to assist said electric machine to offload said off-going clutch. - View Dependent Claims (9, 10, 11)
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12. Apparatus for controlling a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, said apparatus comprising:
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an identified off-going clutch; an identified oncoming clutch; and a powertrain control system including programming to monitor a torque capability of said electric machine to offload reactive torque from said off-going clutch, determine a torque required to assist said electric machine to offload said off-going clutch, command torque from said electric machine to offload said off-going clutch, and selectively command torque through said oncoming clutch based upon said torque required to assist said electric machine to offload said off-going clutch. - View Dependent Claims (13, 14, 15)
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Specification