Method for determining an estimate of a driveline torque using a computer based model
AssigneeCaterpillar Inc.
InventorTodd D. Creger
Life of this patent
Estimating the term…
Abstract
In one aspect of the present invention, a method for determining an estimate of a torque of a powertrain at a point M using a computer based model is provided. The powertrain includes a driveline and an engine. The method includes the steps of sensing a plurality of parameters of the powertrain in realtime during operation and responsively producing a plurality of respective parameter signals, and receiving the parameter signals, determining a modeled value of the torque, and responsively producing a torque signal.
Claims4
A method of determining an estimate of a torque of a powertrain at a point M using a computer based model, the powertrain including a driveline and an engine, comprising the steps of:
- sensing a plurality of parameters of the powertrain in real-time during operation and responsively producing a plurality of respective parameter signals;
- and,
- receiving the parameter signals, determining a modeled value of the torque at an arbitrary point M on the driveline, and responsively producing a torque signal,
- wherein the step of determining a modeled value of the torque includes the steps of:
- calculating a modeled value of a brake power and responsively producing a brake power signal;
- receiving the brake power signal, determining an engine output torque as a function of the brake power signal and responsively producing an engine output torque signal;
- receiving the engine output torque signal, determining a torque converter output torque as a function of the engine output torque signal, and responsively producing a torque converter output torque signal;
- and,
- wherein the modeled value of the torque is a function of the engine output torque.
A method of determining an estimate of a torque of a powertrain at a point M using a computer based model, the powertrain including a driveline and an engine, comprising the steps of:
- sensing a plurality of parameters of the powertrain in real-time during operation and responsively producing a plurality of respective parameter signals;
- and
- receiving the parameter signals, determining a modeled value of the torque at an arbitrary point M on the driveline, and responsively producing a torque signal,
- wherein the step of determining a modeled value of the torque includes the steps of:
- sensing torque converter input speed and responsively producing a torque converter input speed signal;
- sensing torque converter output speed and responsively producing a torque converter output speed signal;
- and
- receiving the torque converter input and output speed signals, determining an estimate of a torque converter output torque, and determining an estimate of the torque of the driveline at the point M (T.sub.M) by the equation:
- T.sub.M =(T.sub.TORQUE--CONVERTER--OUT -T.sub.DRIVELINE--INERTIA--N) (GR.sub.MN) (EFF.sub.MN)
- where, T.sub.TORQUE--CONVERTER--OUT is the torque converter output torque, T.sub.DRIVELINE--INERTIA--N is the driveline inertia torque, GR.sub.MN is a total gear reduction from the engine to point M, and EFF.sub.MN is an efficiency term.
Dependencies are inferred from the claim text.