Method for determining an estimate of a driveline torque using a computer based model

Claim 1

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.

Claim 2

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.

Claim 5

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 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 TORQUE--CONVERTER--OUT is the torque converter output torque, T DRIVELINE--INERTIA--N is the driveline inertia torque, GR MN is a total gear reduction from the engine to point M, and EFF MN is an efficiency term.

Claim 6

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 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 TORQUE--CONVERTER--OUT is the torque converter output torque, T DRIVELINE--INERTIA--N is the driveline inertia torque, GR MN is a total gear reduction from the engine to point M, and EFF MN is an efficiency term.