Method for controlling supercharging pressure in an automotive engine
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorMasaru Kurihara
Life of this patent
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Abstract
An automotive engine has a turbocharger, a wastegate valve for controlling flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the wastegate valve. A standard supercharging pressure is determined dependent on characteristics of the wastegate valve, and a desired supercharging pressure is set in accordance with engine operating conditions. A difference between the desired supercharging pressure and the standard supercharging pressure is calculated, and a ratio of the difference to a detected actual supercharging pressure is calculated. From the calculated ratio, a control value applied to the actuator is calculated.
Claims3
A method for controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling a flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the wastegate valve, comprising the steps of:
- setting a standard supercharging pressure dependent on characteristics of the wastegate valve;
- setting a desired supercharging pressure in accordance with engine operating conditions;
- calculating a difference between the desired supercharging pressure and the standard supercharging pressure;
- detecting an actual supercharging pressure;
- calculating a ratio of said difference to a detected actual supercharging pressure;
- and
- calculating a control value applied to the actuator based on said calculated ratio so as to smoothly control said supercharging pressure.
A method of controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the waste gate valve, comprising the steps of:
- setting a standard supercharging pressure dependent on characteristics of the wastegate valve;
- setting a desired supercharging pressure in accordance with engine operating conditions;
- calculating a control value applied to the actuator with the following equation,
- k.multidot.Ps/P-(k-1+Po/P)
- where k is a supercharging pressure response coefficient, Ps is a desired supercharging pressure, Po is a standard supercharging pressure, and P is an actual supercharging pressure.
Dependencies are inferred from the claim text.