STEADY STATE CONTROL OF MODEL PREDICTIVE CONTROL BASED POWERTRAIN WITH CONTINUOUSLY VARIABLE TRANSMISSION
First Claim
1. A method for controlling a propulsion system of a motor vehicle, the method comprising:
- performing a steady state control enable function to identify when steady state operating conditions are present including;
determining a commanded axle torque;
obtaining a measured actual axle torque; and
identifying when the commanded axle torque is substantially equal to the measured actual axle torque and outputting a signal defining steady state operating conditions are present; and
optimizing fuel economy by constraining program variables for the commanded axle torque to closely follow a reference axle torque when the commanded actual axle torque minus the reference axle torque is less than a calibrated value.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for controlling a propulsion system of a motor vehicle includes: optimizing both torque control and fuel economy during transient operating conditions; performing a steady state control enable function to identify when steady state operating conditions are present including: determining a commanded axle torque; obtaining a measured actual axle torque; and identifying when the commanded axle torque is substantially equal to the measured actual axle torque and outputting a signal; and further includes: directing the signal output from the control enable function to each of an integral action calculator and a Ym filter; performing an integral action calculation to identify an axle torque integral action; and setting a steady state flag when steady state operating conditions are present which fixes system variables directed to optimizing torque control, temporarily ceasing further optimization of torque control when the steady state flag is set.
10 Citations
20 Claims
-
1. A method for controlling a propulsion system of a motor vehicle, the method comprising:
-
performing a steady state control enable function to identify when steady state operating conditions are present including; determining a commanded axle torque; obtaining a measured actual axle torque; and identifying when the commanded axle torque is substantially equal to the measured actual axle torque and outputting a signal defining steady state operating conditions are present; and optimizing fuel economy by constraining program variables for the commanded axle torque to closely follow a reference axle torque when the commanded actual axle torque minus the reference axle torque is less than a calibrated value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for controlling a propulsion system of a motor vehicle, the method comprising:
-
performing a control enable function including; determining a commanded axle torque; obtaining a measured actual axle torque; calculating an absolute value of a difference obtained by subtracting the measured actual axle torque from the commanded axle torque; filtering the absolute value to minimize signal deviations; performing a hysteresis evaluation of the filtered absolute value; comparing an output from the hysteresis evaluation to a predetermined calibration limit range saved in a memory to determine if the commanded axle torque is within a calibration limit range; and initiating a delay timer if the commanded axle torque is within the predetermined calibrated limit range; directing a signal output from the control enable function to each of an integral action calculator and a Ym filter; and outputting an integral action range enable command after a predetermined time period. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A system for controlling a propulsion system of a motor vehicle, comprising:
-
a steady state control enable function identifying when steady state operating conditions are present using each of a commanded axle torque and a measured actual axle torque; a signal output when the commanded axle torque is substantially equal to the measured actual axle torque; an integral action calculator and a Ym filter receiving the signal output from the control enable function; an integral action calculation identifying an axle torque integral action; and a steady state flag set when steady state operating conditions are present which fixes system variables directed to optimizing torque control, temporarily ceasing further optimization of torque control when the steady state flag is set. - View Dependent Claims (19, 20)
-
Specification