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US 9,290,089 B2Granted
Forecast of driveline lash condition for multivariable active driveline damping control
AssigneeGM Global Technology Operations LLC
InventorsHouchun Xia, Robert L. Morris
Life of this patent
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Abstract
A method to predict a driveline lash condition includes monitoring an axle torque request signal, determining a predicted axle torque request value at a lead time based upon the monitored axle torque request signal, and predicting the driveline lash condition at the lead time based upon the predicted axle torque request value indicating an upcoming zero torque condition.
Claims13
Method to predict a driveline lash condition for a powertrain, the method comprising:
- monitoring a series of current axle torque request signal values;
- predictively determining an axle torque request value at a lead time based upon the series of current axle torque request signal values;
- predicting, using a controller, the driveline lash condition at the lead time based upon the predictively determined axle torque request value indicating an upcoming zero torque condition;
- and further comprising
- monitoring a current axle torque estimate signal;
- and
- determining the current axle torque estimate signal to indicate one of a positive current axle torque and a negative current axle torque;
- wherein, if the current axle torque estimate signal is determined to indicate the positive current axle torque, predicting the driveline lash condition at the lead time comprises:
- comparing the predictively determined axle torque request value to a positive torque prediction threshold value;
- and
- predicting the driveline lash condition based upon the predictively determined axle torque request value being less than the positive torque prediction threshold value;
- and
- wherein, if the current axle torque estimate signal is determined to indicate the negative current axle torque, predicting the driveline lash condition at the lead time comprises:
- comparing the predictively determined axle torque request value to a negative torque prediction threshold value;
- and
- predicting the driveline lash condition based upon the predictively determined axle torque request value being greater than the negative torque prediction threshold value;
- controlling the powertrain based upon the predicted driveline lash condition.
14 more elements
Method to predict a vehicle driveline lash condition, the method comprising:
- monitoring a current axle torque estimate signal;
- monitoring a series of current axle torque request signal values;
- filtering the current axle torque request signal values to generate a filtered axle torque request signal;
- predictively determining a first axle torque request value at a first lead time using two values of the filtered axle torque request signal to determine a real-time linearly predicted axle torque request value;
- predictively determining a second axle torque request value at a second lead time using three values of the filtered axle torque request signal to determine a real-time non-linearly predicted axle torque request value;
- predicting the driveline lash condition based upon the current axle torque estimate signal being within a low axle torque estimate range, the current axle torque request signal values being less than a torque request threshold value, and one of the first and second predictively determined axle torque request values being less than a torque prediction threshold value;
- commanding, using a controller, corrective measures based upon predicting the driveline lash condition;
- and
- ceasing the corrective measures based upon a lash condition time span exceeding a minimum lash hold time and the current axle torque request signal values exceeding a calibrated recovery axle torque estimate threshold.
6 more elements
Dependencies are inferred from the claim text.