Method and system for a multivariable engine control using cam phasing with a combined humidity and exhaust gas recirculation (EGR) dilution value to schedule restraints, and determine a reference EGR setpoint

A method for multivariable torque control of a vehicle, the method comprising:

• configuring a processor disposed of in a multivariable controller and programmed with a set of instructions to determine a set of references associated with Exhaust Gas Recirculation (EGR);
• implementing, by the processor, an algorithm based on engine temperature and at least one reference that is determined of the set of references associated with the EGR to generate one or more commands for the control of a set of actuators;
• optimizing, by the processor, at least one cam phase position by the control based on a generated command to at least one actuator of the set of actuators to apply an appropriate level of engine torque for vehicle propulsion;
• restricting, by the processor, an allowable range of cam phases associated with operations of an EGR valve for a set of cams based on amounts of humidity and EGR introduced by the EGR valve during an internal combustion phase of vehicle operation;
• and
• providing an amount of propulsion torque by an engine of the vehicle in accordance with instructions provided by the processor.