Patent ID: 11933234
Assignee: NISSAN MOTOR CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 8:
9. A boost pressure control device for an internal combustion engine, comprising:
a turbo charger including a wastegate valve whose opening is structured to be controlled via an actuator;
a boost pressure sensor structured to sense a real boost pressure;
a target boost pressure setting part configured to set a target boost pressure;
a first opening setpoint setting part configured to set a first setpoint of a target opening of the wastegate valve in accordance with the target boost pressure;
a second opening setpoint setting part configured to set a second setpoint of the target opening while a difference between the target boost pressure and the real boost pressure is larger than a predetermined value, wherein the second setpoint is smaller than the first setpoint;
a limit region determination part configured to determine whether or not a condition for limitation is satisfied in which an intake air quantity is greater than or equal to an intake air quantity criterion and an engine rotation speed is greater than or equal to an engine rotation speed criterion, during operation based on the second setpoint;
a limiter part configured to increase the target opening from the second setpoint for opening control of the wastegate valve, in response to a determination that the condition for limitation is satisfied; and
an actuator control part configured to control the actuator in accordance with the target opening;
wherein the intake air quantity criterion and the engine rotation speed criterion are set such that:
the engine rotation speed criterion decreases as the intake air quantity increases; and
the intake air quantity criterion decreases as the engine rotation speed increases.