Wastegate valve control device

Patent metadata

Field	Value
Publication number	US-9869239-B2
Application number	US-201214422616-A
Country	US
Kind code	B2
Filing date	Aug 23, 2012
Priority date	Aug 23, 2012
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A wastegate valve is arranged in a communication passage that bypasses the exhaust turbine of a turbocharger arranged in the exhaust passage of an internal combustion engine. When the opening degree of the wastegate valve is controlled to the fully closed opening degree, a determination value is calculated based on the operation state of the internal combustion engine, and the turbo rotation speed is detected. When the turbo rotation speed is less than the determination value, a drive force is increased in the direction for closing the wastegate valve.

First claim

The invention claimed is:

1. A wastegate valve control device for an internal combustion engine, wherein the internal combustion engine includes an exhaust passage, a turbocharger having an exhaust turbine arranged in the exhaust passage, and a communication passage through which portions of the exhaust passage that are located upstream and downstream of the exhaust turbine are in communication with each other, wherein a wastegate valve is arranged in the communication passage, the control device comprising:
a sensor that detects an index value for a supercharging amount of the turbocharger; and
an electronic control unit that includes control logic, which when executed, controls an opening degree of the wastegate valve, wherein when the electronic control unit controls the opening degree of the wastegate valve to a fully closed opening degree in which a valve body of the wastegate valve comes into contact with a valve seat of the wastegate valve, the electronic control unit:
detects the index value using the sensor, and
increases a drive force in a direction for closing the wastegate valve to increase a pushing force of the valve body against the valve seat if the detected index value indicates a low supercharging state in which the supercharging amount is lower than a determination value,

wherein the determination value is based on an intake air amount and a fuel injection amount of the internal combustion engine.

2. A wastegate valve control device for an internal combustion engine, wherein the internal combustion engine includes an exhaust passage, a turbocharger having an exhaust turbine arranged in the exhaust passage, and a communication passage through which portions of the exhaust passage that are located upstream and downstream of the exhaust turbine are in communication with each other, wherein a wastegate valve is arranged in the communication passage, the control device comprising:
a sensor that detects an index value for a supercharging amount of the turbocharger; and
an electronic control unit that includes control logic, which when executed, controls an opening degree of the wastegate valve, wherein when the electronic control unit controls the opening degree of the wastegate valve to a fully closed opening degree in which a valve body of the wastegate valve comes into contact with a valve seat of the wastegate valve, the electronic control unit:
detects the index value using the sensor, and
increases a drive force in a direction for closing the wastegate valve to increase a pushing force of the valve body against the valve seat if the detected index value indicates a low supercharging state in which the supercharging amount is lower than a determination value,

wherein the index value is a rotation speed of a rotary shaft of the turbocharger.

3. The wastegate valve control device according to claim 1 , wherein the wastegate valve is an electric valve.

4. A wastegate valve control method for an internal combustion engine, wherein the internal combustion engine includes an exhaust passage, a turbocharger having an exhaust turbine arranged in the exhaust passage, and a communication passage through which portions of the exhaust passage that are located upstream and downstream of the exhaust turbine are in communication with each other, wherein a wastegate valve is arranged in the communication passage and includes a valve seat and a valve body that moves toward and away from the valve seat, the control method comprising:
when controlling an opening degree of the wastegate valve to a fully closed opening degree in which the valve body comes into contact with the valve seat,
detecting an index value using a sensor for a supercharging amount of the turbocharger, and
increasing a drive force using an electronic control unit in a direction for closing the wastegate valve to increase a pushing force of the valve body against the valve seat if the detected index value indicates a low supercharging state in which the supercharging amount is lower than a determination value,

wherein the determination value is based on an intake air amount and a fuel injection amount of the internal combustion engine.

Assignees

• Saeki Masanori
• Toyota Motor Co Ltd

Inventors

• Saeki Masanori

Classifications

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F02D41/2464

  Characteristics of actuators · CPC title

• F02D41/221

  relating to the failure of actuators or electrically driven elements · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic