| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device and a control method of a reduction agent injection valve capable of precisely supplying a necessary amount of ammonia to a reduction catalyst. SOLUTION: The control device for the reduction agent injection valve, which performs on-off control of a switching element and controls energization of an electromagnetic solenoid, to control the reduction agent injection valve, includes a target injection amount calculation unit for calculating a target injection amount of the reduction agent, a first current output signal calculation unit for calculating supply time and a duty ratio of a first current output signal to generate a first current to be supplied to the electromagnetic solenoid at the beginning of injection, a second current output signal calculation unit for calculating a duty ratio representing supply time of a second current output signal to generate a second current to be supplied after the first current is supplied, a temperature calculation part for estimating a predetermined temperature within the reduction agent injection valve, and an output signal correction unit for correcting at least one of the first current output signal and the second current output signal on the basis of the estimated predetermined temperature. COPYRIGHT: (C)2011,JPO&INPIT |
