US 10,518,781 B2 · Powertrain with anti-shuffle control

Abstract

Powertrains may include a spring damper between the engine crankshaft and transmission input shaft. In some circumstances, an oscillation known as shuffle may occur in such powertrains. Active adjustment of engine torque is substantially more effective at mitigating shuffle oscillations if the engine torque includes a p-term proportional to displacement of the damper spring in addition to a d-term proportional to the speed difference across the damper. For various reasons, the spring displacement is difficult to measure directly. An observer algorithm is utilized to calculate a current estimated spring displacement based on a crankshaft speed sensor, a transmission input speed sensor, a wheel speed sensor, and past engine torques, using a dynamic model of the powertrain.

Claims17

Dependent claims

A method of controlling a powertrain comprising:

transmitting power from a powerplant to vehicle wheels via a transmission wherein a transmission input shaft is coupled to a powerplant shaft by a torsion damper having a spring and a transmission output shaft is driveably connected to vehicle wheels by a driveline;
based on a time series of past measured rotational velocities of the powerplant shaft, the transmission input shaft, and the vehicle wheels, and a time series of past powerplant torque values, calculating an estimated current displacement of the spring;
calculating an estimated current rate of change of spring displacement;
and
adjusting a current powerplant torque based on (i) the estimated current displacement of the spring and (ii) the estimated current rate of change of spring displacement to reduce a spring displacement oscillation.

2 more elements

Dependencies are inferred from the claim text.

Powertrain with anti-shuffle control

Life of this patent

Powertrain with anti-shuffle control

Life of this patent

Abstract

Claims17