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US 6,390,063 B1Granted
Intake-air quantity control apparatus for internal combustion engine with variable valve timing system
AssigneeNissan Motor Co., Ltd.
InventorsTakeaki Obata, Takao Kawasaki, Masahiro Arai
Life of this patent
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Abstract
In an intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system, an electronic engine control module has a microprocessor programmed to perform selecting one of a first control mode in which an intake-air quantity of the engine is controlled by adjusting the throttle opening, and a second control mode in which an intake-air quantity of the engine is controlled by adjusting the intake-valve closure timing. The microprocessor is programmed to perform a number of calculating and setting steps regarding the intake-air quantity and in-take valve closure timing.
Claims21
An intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system comprising:
- a throttle valve disposed in an intake-air passage of the engine and controlled so that a throttle opening of said throttle valve is brought closer to a target throttle opening (tTVO);
- an intake valve disposed between the intake-air passage and a combustion chamber of the engine and controlled so that an intake-valve closure timing of said intake valve is brought close to a target intake-valve closure timing (tIVC);
- and
- a microprocessor programmed to perform the following:
- (a) selecting one of a first control mode in which an intake-air quantity of the engine is controlled by adjusting the throttle opening of said throttle valve, and a second control mode in which an intake-air quantity of the engine is controlled by adjusting the intake-valve closure timing of said intake valve;
- (b) calculating a steady-state target engine torque (stTe) based on operating conditions (APS, Ne) of the engine, the steady-state target engine torque (stTe) indicating a steady-state target value of engine torque;
- (c) calculating a target engine torque (tTe) based on the steady-state target engine torque (stTe), the target engine torque (tTe) following the steady-state target engine torque (stTe) with a predetermined time delay;
- (d) setting a steady-state target intake-valve closure timing (stIVC) at a basic intake-valve closure timing (IVCb) when the first control mode is selected, the steady-state target intake-valve closure timing (stIVC) indicating a steady-state target value of the intake-valve closure timing;
- (e) calculating a steady-state target intake-air-passage internal pressure (stP) based on both the steady-state target engine torque (stTe) and the steady-state target intake-valve closure timing (stIVC) when the first control mode is selected, the steady-state target intake-air-passage internal pressure (stP) indicating a steady-state target value of an internal pressure in the intake-air passage;
- (f) setting the steady-state target intake-air-passage internal pressure (stP) at a basic pressure (Pb) when the second control mode is selected;
- (g) calculating the steady-state target intake-valve closure timing (stIVC) based on both the target engine torque (tTe) and the steady-state target intake-air-passage internal pressure (stP) when the second control mode is selected;
- (h) obtaining a real intake-air-passage internal pressure (rP), the real intake-air-passage internal pressure (rP) indicating an actual internal pressure in the intake-air passage;
- (i) calculating the target throttle opening (tTVO) based on both the steady-state target intake-valve closure timing (stIVC) and the steady-state target intake-air-passage internal pressure (stP);
- and
- (j) calculating the target intake-valve closure timing (tIVC) based on both the target engine torque (tTe) and the real intake-air-passage internal pressure (rP).
12 more elements
An intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system comprising:
- a throttle valve disposed in an intake-air passage of the engine and controlled so that a throttle opening of said throttle valve is brought closer to a target throttle opening (tTVO);
- an intake valve disposed between the intake-air passage and a combustion chamber of the engine and controlled so that an intake-valve closure timing of said intake valve is brought close to a target intake-valve closure timing (tIVC);
- and
- a microprocessor programmed to perform the following:
- (a) selecting one of a first control mode in which an intake-air quantity of the engine is controlled by adjusting the throttle opening of said throttle valve, and a second control mode in which an intake-air quantity of the engine is controlled by adjusting the intake-valve closure timing of said intake valve;
- (b) calculating a steady-state target intake-air quantity (stQH01) based on operating conditions (APS, Ne) of the engine, the steady-state target intake-air quantity (stQH01) indicating a steady-state target value of intake-air quantity needed when the first control mode is selected;
- (c) calculating a target intake-air quantity (tQH02) based on the steady-state target intake-air quantity (stQH01), the target intake-air quantity (tQH02) indicating a target value of intake-air quantity needed when the second control mode is selected;
- (d) calculating the target throttle opening (tTVO) based on the steady-state target intake-air quantity (stQH01) when the first control mode is selected;
- (e) setting the target intake-valve closure timing (tIVC) at a basic intake-valve closure timing (IVCb) when the first control mode is selected;
- (f) setting the target throttle opening (tTVO) at a predetermined throttle opening when the second control mode is selected, the predetermined throttle opening indicating a throttle opening of said throttle valve at which the internal pressure in the intake-air passage becomes the basic pressure (Pb);
- and
- (g) calculating the target intake-valve closure timing (tIVC) based on the target intake-air quantity (tQH02) when the second control mode is selected.
9 more elements
An intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system comprising:
- a throttle valve disposed in an intake-air passage of the engine and controlled so that a throttle opening of said throttle valve is brought closer to a target throttle opening (tTVO);
- an intake valve disposed between the intake-air passage and a combustion chamber of the engine and controlled so that an intake-valve closure timing of said intake valve is brought close to a target intake-valve closure timing (tIVC);
- and
- a microprocessor programmed to perform the following:
- (a) selecting one of a first control mode in which an intake-air quantity of the engine is controlled by adjusting the throttle opening of said throttle valve, and a second control mode in which an intake-air quantity of the engine is controlled by adjusting the intake-valve closure timing of said intake valve;
- (b) calculating a desired value of the intake-air quantity based on operating conditions (APS, Ne) of the engine, in accordance with a predetermined time-delay characteristic between initiation of adjustment of the throttle opening of said throttle valve and an actual change in an internal pressure in the intake-air passage;
- (c) calculating a target throttle opening (tTVO) based on the operating conditions when the first control mode is selected;
- (d) setting a target intake-valve closure timing (tIVC) at a basic intake-valve closure timing (IVCb) when the first control mode is selected;
- (e) setting the target throttle opening (tTVO) at a predetermined throttle opening when the second control mode is selected;
- and
- (f) calculating the target intake-valve closure timing (tIVC) based on the desired value of the intake-air quantity when the second control mode is selected.
8 more elements
Dependencies are inferred from the claim text.