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
Estimating the term…
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.
Claims17
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;
- setting a control gain of the feedback control based on the calculated present value of the lift time area;
- and
- calculating an air sensitivity using the present value of the valve characteristic, and setting of the control gain is based on the calculated air sensitivity.
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,
- wherein the control gain is set smaller 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 that is an integral of the valve lift amount during a time period from when intake valve is open to when it is closed, 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.