초록 ▼

A variable valve mechanism performs a valve lift switching operation for an intake valve. ECU defines valve lift switching characteristics corresponding to the engine operating region and executes the valve lift switching operation based on the switching characteristics. ECU calculates a parameter

A variable valve mechanism performs a valve lift switching operation for an intake valve. ECU defines valve lift switching characteristics corresponding to the engine operating region and executes the valve lift switching operation based on the switching characteristics. ECU calculates a parameter fluctuation amount of an engine occurring in response to the valve lift switching operation, and corrects the valve lift switching characteristics when the calculated parameter fluctuation amount exceeds a predetermined judgment value.

대표청구항 ▼

What is claimed is: 1. A control apparatus for an internal combustion engine equipped with a variable valve lifting device which switches lift characteristics of an intake valve and/or an exhaust valve of an internal combustion engine from one of first and second control modes differentiated from e

What is claimed is: 1. A control apparatus for an internal combustion engine equipped with a variable valve lifting device which switches lift characteristics of an intake valve and/or an exhaust valve of an internal combustion engine from one of first and second control modes differentiated from each other in said lift characteristics to the other of the control modes in an operating condition of the internal combustion engine operated based on one or more control parameters, said control apparatus comprising: a torque calculating unit which calculates an output torque of said internal combustion engine controlled based on the first or second control mode; a torque learning unit which learns a torque calculated by said torque calculating unit immediately before switching from the first control mode to the second control mode as a pre-switching torque, and also learning a torque calculated by said torque calculating unit immediately after switching from the first control mode to the second control mode as a post-switching torque; and a specific control parameter correcting unit which corrects a specific control parameter selected from the control parameters in the second control mode, when the control mode of said variable valve lifting device has been switched from the first control mode to the second control mode, based on the pre-switching torque and the post-switching torque of said torque learning unit so as to reduce a difference in an output torque of said internal combustion engine between the first and second control modes. 2. The control apparatus in accordance with claim 1, wherein said specific control parameter correcting unit is configured to correct at least one of an ignition timing, a valve timing, and a throttle opening degree as said specific control parameter. 3. The control apparatus in accordance with claim 1, wherein said variable valve lifting device is adapted to switch to one of the first and second modes so as to lift up or down the intake valve and/or the exhaust valve by a first lift amount and is adapted to switch to the other mode so as to lift up or down the intake valve and/or the exhaust valve by a second lift amount larger than the first lift amount. 4. The control apparatus in accordance with claim 1, wherein the operating condition of the internal combustion engine denotes one of an engine rotational speed, an intake pipe pressure, an intake air amount and a throttle opening degree. 5. A control apparatus for an internal combustion engine equipped with a variable valve lifting device which switches lift characteristics of an intake valve and/or an exhaust valve of an internal combustion engine from one of first and second control modes differentiated from each other in said lift characteristics to the other of the control modes in an operating condition of the internal combustion engine operated based on one or more control parameters, said control apparatus comprising: a torque information detecting unit which detects torque information relating to an output torque of the internal combustion engine; a torque information learning unit which learns torque information detected by said torque information detecting unit immediately before switching from the first control mode to the second control mode as a pre-switching torque information, and also learning torque information detected by said torque information detecting unit immediately after switching from the first control mode to the second control mode as a post-switching torque information; and a specific control parameter correcting unit which corrects a specific control parameter selected from the control parameters in the second control mode, when the control mode of said variable valve lifting device has been switched from the first control mode to the second control mode, based on the pre-switching torque information and the post-switching torque information of said torque information learning unit so as to reduce a difference in an output torque of said internal combustion engine between the first and second control modes. 6. The control apparatus in accordance with claim 5, wherein said specific control parameter correcting unit is configured to correct at least one of an ignition timing, valve timing, and a throttle opening degree as said specific control parameter. 7. The control apparatus in accordance with claim 5, wherein said variable valve lifting device is adapted to switch to one of the first and second modes so as to lift up or down the intake valve and/or the exhaust valve by a first lift amount and is adapted to switch to the other mode so as to lift up or down the intake valve and/or the exhaust valve by a second lift amount larger than the first lift amount. 8. The control apparatus in accordance with claim 5, wherein the operating condition of the internal combustion engine denotes one of an engine rotational speed, an intake pipe pressure, an intake air amount and a throttle opening degree. 9. A control apparatus for an internal combustion engine equipped with a variable air intake device which switches an intake passage condition of an internal combustion engine from one of first and second control modes differentiated from each other in said intake passage condition to the other of the control modes in an operating condition of the internal combustion engine operated based on one or more control parameters, said control apparatus comprising: a torque calculating unit which calculates an output torque of said internal combustion engine controlled based on the first or second control mode; a torque learning unit which learns a torque calculated by said torque calculating unit immediately before switching from the first control mode to the second control mode as a pre-switching torque, and also learning a torque calculated by said torque calculating unit immediately after switching from the first control mode to the second control mode as a post-switching torque; and a specific control parameter correcting unit which corrects a specific control parameter selected from the control parameters in the second control mode, when the control mode of said variable air intake device has been switched from the first control mode to the second control mode, based on the pre-switching torque and the post-switching torque of said torque learning unit so as to reduce a difference in an output torque of said internal combustion engine between the first and second control modes. 10. The control apparatus in accordance with claim 9, wherein said specific control parameter correcting unit is configured to correct at least one of an ignition timing, a valve timing, and a throttle opening degree as said specific control parameter. 11. The control apparatus in accordance with claim 9, wherein said variable air intake device is adapted to switch the first and second modes so as to change an intake pipe length. 12. The control apparatus in accordance with claim 9, wherein the operating condition of the internal combustion engine denotes one of an engine rotational speed, an intake pipe pressure, an intake air amount and a throttle opening degree. 13. A control apparatus for an internal combustion engine equipped with a variable air intake device which switches intake passage condition of an internal combustion engine from one of first and second control modes differentiated from each other in said intake passage condition to the other of the control modes in an operating condition of the internal combustion engine operated based on one or more control parameters, said control apparatus comprising: a torque information detecting unit which detects torque information relating to an output torque of the internal combustion engine; a torque information learning unit which learns torque information detected by said torque information detecting unit immediately before switching from the first control mode to the second control mode as a pre-switching torque information, and also learning torque information detected by said torque information detecting unit immediately after switching from the first control mode to the second control mode as a post-switching torque information; and a specific control parameter correcting unit which corrects a specific control parameter selected from the control parameters in the second control mode, when the control mode of said variable air intake device has been switched from the first control mode to the second control mode, based on the pre-switching torque information and the post-switching torque information of said torque information learning unit so as to reduce a difference in an output torque of said internal combustion engine between the first and second control modes. 14. The control apparatus in accordance with claim 13, wherein said specific control parameter correcting unit is configured to correct at least one of an ignition timing, a valve timing, and a throttle opening degree as said specific control parameter. 15. The control apparatus in accordance with claim 13, wherein said variable air intake device is adapted to switch the first and second modes so as to change an intake pipe length. 16. The control apparatus in accordance with claim 13, wherein the operating condition of the internal combustion engine denotes one of an engine rotational speed, an intake pipe pressure, an intake air amount and a throttle opening degree.