Transient-state control method for a hybrid drive system for vehicles

摘要

The invention relates to a method of controlling a hybrid drive system having at least one electric machine and at least one diesel engine. The invention corrects the static torque setpoint Teng,ssp of the diesel engine and is performed in a transient state by constructing a nitrogen oxides (NOx) emission model allowing estimation of the emissions of the diesel engine as a function of torque Teng of the diesel engine; calculating a dynamic NOx emission setpoint NOxsp from the NOx emission model; from the static torque setpoint Teng,ssp determining a dynamic torque setpoint of the diesel engine Tengsp from NOx emission setpoint NOxsp; determining a dynamic torque setpoint of the electric machine Tmotsp as a function of the static torque setpoint Tpwtsp of the drive system and of the dynamic torque setpoint of the diesel engine Tengsp and applying the dynamic torque setpoints to the drive system.

主权项

1. A computer-implemented method of controlling a hybrid drive system including at least one electric machine and at least one diesel engine, wherein a static torque setpoint of the diesel engine is acquired, comprising:
constructing a NOx emission model allowing estimation of the emissions of the diesel engine as a function of a torque of the diesel engine; calculating a dynamic NOx emission setpoint from the NOx emission model and from the static torque setpoint of the diesel engine, a NOx reduction factor parameter ξ being set, and the NOx emission setpoint NOxsp being calculated as a function of the NOx reduction factor ξ according to the equations:NOxsp=NOxs+Δ⁢⁢NOx⁡(1-ξ100)wherein NOxs is a level of the NOx emissions under static conditions and ΔNOx is the NOx peak amplitude with respect to static conditions and
ΔNOx=NOx−NOxs wherein NOx is the maximum dynamic peak value and NOxs is the NOx emission level under static conditions;
determining a dynamic torque setpoint of the diesel engine from the NOx emission setpoint; determining a dynamic torque setpoint of the electric machine as a function of the dynamic torque setpoint of the diesel engine; and applying the dynamic torque setpoints to the drive system.