| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device of an exhaust purification system which achieves both failure avoidance of a urea water pump and improvement in start-up performance by changing start-up torque of a motor in accordance with a condition.SOLUTION: A torque changing section 34 controls torque generated by a motor 16 in a manner that changes first torque which is usual start-up torque to second torque which is lower than the first torque when freezing of urea water is considered in a previous start-up condition. That is, the motor 16 is started up with the second torque lower than the first torque when a urea water thawing process is performed in the last start-up of the motor 16 and thereby preventing the motor 16 and a urea water pump 15 driven thereby from excessive force. In contrast, the torque changing section 34 sets the torque applied to the motor 16 at the usual first torque when the urea water thawing process taking into consideration the freezing of the urea water is not performed in the last start-up and thereby enabling the motor 16 to achieve a target rotation speed in a short period of time. |
