CATALYST WARMUP METHOD OF HYBRID VEHICLE AND CATALYST WARMUP CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a catalyst warmup method of a hybrid vehicle which can inexpensively secure a charge capacity at catalyst warmup.SOLUTION: In a catalyst warmup method of a hybrid vehicle, a first clutch CL1 is released on the basis of the establishment of a warmup condition of a catalyst 101 which is arranged at an exhaust system 100 of an engine Eng, driver requirement torque is outputted from a motor generator MG, on the other hand, the catalyst 101 is warmed by driving the engine Eng with a starter motor SSG as a load until a warmup finish condition is established, during the warmup, the generation power of the starter motor SSG is charged to a second low-voltage battery 32, after a finish of the warmup, a first battery block relay switch 51 is blocked, the first low-voltage battery 31 is released from a low-voltage system circuit 21, a step-down voltage of a DC-DC converter 40 is set at a lower voltage which is lower than that of the second low-voltage battery 32, and the second low-voltage battery 32 is discharged by a load of auxiliary machines 20 until a prescribed chargeable capacity is obtained.SELECTED DRAWING: Figure 1