Engine torque determination for powertrain with torque converter
AssigneeFord Global Technologies, LLC
InventorsBradley Dean Riedle, David Karl Bidner, Jeffrey Allen Doering, Vincent John Winstead
Life of this patent
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Abstract
A system and method for controlling a multiple cylinder internal combustion engine include determining a driver-demanded torque, determining a first torque based on the driver-demanded torque and a torque converter model, and determining a second torque based on an engine speed error between a current and target engine speed multiplied by a calibratable gain factor based on the speed ratio of the torque converter. The engine is then controlled to deliver the sum of the first and second engine torques to improve system response to part-throttle acceleration requests, particularly for vehicle launch and drive away.
Claims30
A method for controlling a multiple cylinder internal combustion engine coupled to a transmission via a torque converter impeller selectively fluidly coupled to a torque converter turbine, the method comprising:
- determining a driver-demanded torque;
- determining a target engine speed to deliver a desired torque converter turbine torque corresponding to the driver-demanded torque;
- determining a first engine torque based on the target engine speed;
- determining a second engine torque to increase the engine speed from a current speed to the target engine speed;
- and
- controlling the engine to deliver the sum of the first and second engine torques.
A method for controlling a multiple cylinder internal combustion engine coupled to a transmission via a torque converter having a torque converter impeller selectively fluidly coupled to a torque converter turbine, the method comprising:
- determining a driver-demanded torque;
- determining a first engine torque based on the driver demanded torque and a steady-state model of the torque converter;
- determining a second engine torque based on a current engine speed and a target engine speed, wherein the second engine torque is based on a speed ratio of turbine speed and impeller speed;
- and
- controlling the engine to deliver the sum of the first and second engine torques.
A system for controlling a multiple cylinder internal combustion engine coupled to a transmission via a torque converter having a torque converter impeller selectively fluidly coupled to a torque converter turbine, the system comprising:
- an electronic controller in communication with at least the internal combustion engine and an accelerator pedal for determining a driver-demanded torque, the electronic controller determining a first engine torque based on the driver-demanded torque and a steady-state model of the torque converter, determining a second engine torque based on a current engine speed, a target engine speed, and a speed ratio of turbine speed and impeller speed, and controlling the engine to deliver the sum of the first and second engine torques.
A computer readable medium having stored data representing instructions executable by a computer to control a multiple cylinder internal combustion engine coupled to a transmission via a torque converter having a torque converter impeller selectively fluidly coupled to a torque converter turbine, the computer readable storage medium comprising:
- instructions for determining a driver-demanded torque;
- instructions for determining a first engine torque based on the driver-demanded torque and a steady-state model of the torque converter;
- instructions for determining a second engine torque based on a current engine speed and a target engine speed, wherein the second engine torque is based on a speed ratio of turbine speed and impeller speed;
- and
- instructions for controlling the engine to deliver the sum of the first and second engine torques.
Dependencies are inferred from the claim text.