| 摘要 |
An object is to prevent a large quantity of unburned HC components from being released to the outside until a diesel oxidation catalyst reaches an activation temperature after early post-injection. In the present invention, by reducing a throttle opening of a variable throttle mechanism 77 provided in an oil passage 72, or increasing a set value of an oil pressure level detected in an oil pressure sensor 78 provided on the downstream side of the variable throttle mechanism 77, power of an oil circulation pump 74 is increased before a start point t1 of the early post-injection. With this arrangement, by increasing a load of a diesel engine 10 to increase a temperature rise gradient of exhaust gas at the stage of increasing the temperature of the diesel oxidation catalyst, the unburned HC component released until the diesel oxidation catalyst 50 reaches the activation temperature is reduced.
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