US Patent 7373933 Control apparatus and control method of vehicular driving apparatus

A control apparatus/method curbs the degradation of emission gas, for a vehicular driving apparatus including an engine and a second driving power source that assists the engine in the output of driving power. Torque assist is executed by a hybrid controller through the use of a first motor-generator and/or the second motor-generator so that the EGR rate achieved by an EGR device becomes greater than or equal to an EGR rate threshold value (first EGR rate) determined on the basis of the load state of an engine. Therefore, it becomes possible to put the engine in a low load state where the EGR rate, which decreases as the engine shifts to higher load states, is greater than or equal to the EGR rate threshold value.