Valve characteristic control device for internal combustion engine and method of the same
AssigneesToyota Jidosha Kabushiki Kaisha, Denso Corporation
InventorsNaohide Fuwa, Hisayo Yoshikawa
Life of this patent
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Abstract
A lift time area is calculated based on an actual valve working angle of an intake valve and an engine rotational speed. Then, a control gain of a feedback control is set based on the lift time area.
Claims14
A valve characteristic control device for an internal combustion engine including a variable valve mechanism that varies a valve characteristic of an intake valve, the valve characteristic being related to a lift time area of the intake valve, comprising:
- a control unit that performs feedback control of the variable valve mechanism based on a difference between a target value and a present value of the valve characteristic;
- a calculation unit that calculates an air sensitivity of a present value of the lift time area;
- and
- a setting unit that sets a control gain of the feedback control in accordance with the calculated air sensitivity.
A valve characteristic control device for an internal combustion engine including a variable valve mechanism that varies a valve characteristic of an intake valve, the valve characteristic being related to a lift time area of the intake valve, comprising:
- a control unit that performs feedback control of the variable valve mechanism based on a difference between a target value and a present value of the valve characteristic;
- and
- a setting unit that sets a control gain of the feedback control in accordance with a present value of the lift time area such that the control gain decreases as the present value of the lift time area decreases.
A valve characteristic control method for an internal combustion engine including a variable valve mechanism that varies a valve characteristic of an intake valve, the valve characteristic being related to a lift time area of the intake valve, comprising:
- performing feedback control of the variable valve mechanism based on a difference between a target value and a present value of the valve characteristic;
- calculating a present value of the lift time area;
- and
- setting a control gain of the feedback control based on the calculated present value of the lift time area.
Dependencies are inferred from the claim text.