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

Claim 0:
1. A boost pressure control method for an internal combustion engine provided with a turbo charger including a wastegate valve, the boost pressure control method comprising:
setting a target boost pressure;
setting a first setpoint of opening of the wastegate valve in accordance with the target boost pressure;
while a difference between the target boost pressure and a real boost pressure is larger than a predetermined value, controlling the opening of the wastegate valve to a second setpoint, wherein the second setpoint is smaller than the first setpoint;
while controlling the opening of the wastegate valve to the second setpoint, determining 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;
in response to a determination that the condition for limitation is satisfied, controlling the opening of the wastegate valve in a direction to increase from the second setpoint; and
setting the intake air quantity criterion and the engine rotation speed criterion 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.