Controller and control method for wastegate
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsSatoshi Yoshizaki, Masahiro Inoue, Koji Honda
Life of this patent
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Abstract
A wastegate is provided in an exhaust bypass passage that allows exhaust gas to bypass a turbine wheel of an exhaust turbine-type forced-induction device. A required boost pressure is set in accordance with a running state of an engine. A controller is configured to control a drive force of the wastegate to a magnitude that achieves the required boost pressure when the required boost pressure is higher than a preset pressure, and control the drive force to a magnitude that achieves a higher boost pressure than the required boost pressure when the required boost pressure is less than or equal to the preset pressure.
Claims6
A controller for a wastegate, the wastegate being provided in an exhaust bypass passage of an engine that allows exhaust gas to bypass a turbine wheel of an exhaust turbine forced-induction device, comprising:
- processes executed by processing circuitry to:
- set a preset boost pressure,
- determine a current running state of the vehicle based on a sensor provided to the engine,
- set a required boost pressure corresponding to a target torque of the engine in accordance with the current running state of the engine,
- actuate the wastegate to obtain a drive force at a magnitude that achieves the required boost pressure when the required boost pressure is higher than the preset boost pressure, and
- actuate the wastegate to obtain the drive force at a magnitude that achieves a higher boost pressure than the required boost pressure when the required boost pressure is less than or equal to the preset boost pressure.
A method for controlling a wastegate, the wastegate being provided in an exhaust bypass passage of an engine that avows exhaust gas to bypass a turbine wheel of an exhaust turbine forced-induction device, the method comprising:
- via a controller,
- setting a preset boost pressure,
- determining a current running state of the vehicle based on a sensor provided to the engine,
- setting a required boost pressure in accordance with the current running state of the engine,
- actuating the wastegate to obtain a drive force at a magnitude that achieves the required boost pressure when the required boost pressure is higher than the preset boost pressure, and
- actuating the wastegate to obtain the drive force at a magnitude that achieves a higher boost pressure than the required boost pressure when the required boost pressure is less than or equal to the preset boost pressure.
A non-transitory computer-readable storage medium that stores a program causing a processor of a controller to execute a control process for a wastegate, the wastegate being provided in an exhaust bypass passage of an engine that allows exhaust gas to bypass a turbine wheel of an exhaust turbine forced-induction device, the control process comprising:
- setting a preset boost pressure,
- determining a current running state of the vehicle based on a sensor provided to the engine,
- setting a required boost pressure in accordance with the current running state of the engine,
- actuating the wastegate to obtain a drive force at magnitude that achieves the required boost pressure when the required boost pressure is higher than the preset boost pressure, and
- actuating the wastegate to obtain the drive force at a magnitude that achieves a higher boost pressure than the required boost pressure when the required boost pressure is less than or equal to the preset boost pressure.
Dependencies are inferred from the claim text.