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US 11,619,190 B2Granted
Methods and system for estimating engine torque at low temperatures
AssigneeFord Global Technologies, LLC
InventorsFazal Urrahman Syed, Timothy Baxendale, Thomas Ciccone, Sassan Farahmand, Kelly Johnson
Life of this patent
Estimating the term…
Abstract
A method and system for operating a vehicle that includes an integrated starter/generator and a driveline disconnect clutch is described. In one example, the method estimates engine torque as a function of engine temperature during cold engine starts so that if an estimate of engine torque is in error, the integrated starter/generator may still successfully start the engine.
Claims16
A method for operating a driveline, comprising:
- estimating engine torque based on engine speed and engine air flow via a controller;
- adjusting torque of an electric machine in response to the estimated engine torque during a first condition, where the first condition is an engine temperature greater than a threshold temperature;
- and
- adjusting torque of the electric machine in response to a fraction of the estimated engine torque during a second condition.
1 more element
A vehicle system, comprising:
- an internal combustion engine;
- an electric machine;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust torque of the electric machine in response to a first engine torque estimation value and a second engine torque estimation value, where the first engine torque estimation value is generated based on engine speed and engine air flow and where the second engine torque estimation value is generated not based on engine speed and engine air flow, and additional instructions to multiply the second engine torque estimation value and a weighting factor that is a function of time.
1 more element
A method for operating a driveline, comprising:
- rotating an engine via closing a driveline disconnect clutch and rotating an electric machine in response to a request to start the engine;
- adjusting torque of the electric machine while rotating the engine in response to a speed error of the electric machine and an engine torque estimate that is not a function of engine air flow and engine speed.
Dependencies are inferred from the claim text.