METHOD AND APPARATUS FOR MANAGING TORQUE IN A HYBRID POWERTRAIN SYSTEM
First Claim
1. Method for operating a powertrain system configured to transfer torque to a driveline, the powertrain system comprising an internal combustion engine and an electric machine coupled via a torque transfer device to a transmission, the method comprising:
- establishing an operating torque security limit comprising a default torque security limit;
setting the operating torque security limit to an override limit when engine speed is less than a threshold speed; and
detecting a torque security fault only when a combined torque output from the internal combustion engine and the electric machine to the torque transfer device deviates from an operator torque request by an amount greater than the operating torque security limit.
3 Assignments
0 Petitions
Accused Products
Abstract
A powertrain system includes an internal combustion engine and an electric machine coupled via a torque transfer device to a transmission. A method for operating the powertrain system to transfer torque to a driveline includes establishing an operating torque security limit that is a default torque security limit. The operating torque security limit is set to an override limit when engine speed is less than a threshold speed. A torque security fault is detected only when a combined torque output from the internal combustion engine and the electric machine to the torque transfer device deviates from an operator torque request by an amount greater than the operating torque security limit.
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Citations
19 Claims
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1. Method for operating a powertrain system configured to transfer torque to a driveline, the powertrain system comprising an internal combustion engine and an electric machine coupled via a torque transfer device to a transmission, the method comprising:
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establishing an operating torque security limit comprising a default torque security limit; setting the operating torque security limit to an override limit when engine speed is less than a threshold speed; and detecting a torque security fault only when a combined torque output from the internal combustion engine and the electric machine to the torque transfer device deviates from an operator torque request by an amount greater than the operating torque security limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Method for operating a powertrain system configured to transfer torque to a driveline, the powertrain system comprising an internal combustion engine and an electric machine coupled via a torque converter to a transmission, the method comprising:
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setting an operating torque security limit to an override limit greater than a default torque security limit when engine speed is less than a threshold speed; and detecting a torque security fault only when a combined torque output from the internal combustion engine and the electric machine to the torque converter deviates from an operator torque request by an amount greater than the operating torque security limit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. Method for operating a hybrid powertrain system coupled to a driveline, comprising:
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establishing an operating torque security limit associated with torque transfer from the powertrain system to the driveline; setting a first threshold speed to a magnitude that is greater than a second threshold speed; setting an override torque limit as the operating torque security limit when the engine speed is increasing and is less than the first threshold speed; and setting a default torque security limit as the operating torque security limit when the engine speed subsequently exceeds the first threshold speed; increasing the default torque security limit to the override torque limit only when the engine speed subsequently falls below the second threshold speed; and detecting a torque security fault only when a torque output from an internal combustion engine and an electric machine to a torque transfer device deviates from an operator torque request by an amount greater than the operating torque security limit.
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Specification