| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection quantity control device capable of suppressing excessive rotation of a turbocharger.SOLUTION: A control device 50 includes an acquiring section 51 for acquiring a turbine rotational frequency, a switching section 52 for switching a fuel injection mode from a normal mode to a limit mode, and a limit quantity calculating section 53 for calculating limit quantity as a limit value of fuel injection quantity in the limit mode. The limit quantity calculating section 53 calculates a proportional term by multiplying a deviation between an allowed rotational frequency and the turbine rotational frequency by a proportional gain and an integration term by multiplying an integrated value of the deviation by an integral gain as correction terms for reducing the limit quantity when the turbine rotational frequency is larger than the allowed rotational frequency, and the proportional term and the integration term are added to a basic value of the limit quantity in the limit mode, and thereby, the limit value can be calculated. |
