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US 7,017,551 B2Granted
Intake control apparatus for internal combustion engine and method thereof
AssigneeHitachi, Ltd.
InventorHirokazu Shimizu
Life of this patent
Estimating the term…
Abstract
When a detection value of an intake pressure is normal, an electronically controlled throttle is controlled to attain a target intake pressure, a variable valve mechanism is controlled to attain a target intake air amount, and the control of the variable valve mechanism is corrected based on the detection value of the intake pressure. Contrary to this, when the detection value of the intake pressure is abnormal, the electronically controlled throttle is controlled to attain the target intake air amount, and also, the variable valve mechanism is controlled based on a fixed target opening characteristic.
Claims20
An intake control apparatus for an internal combustion engine, comprising:
- an electronically controlled throttle;
- a variable valve mechanism varying an opening characteristic of an intake valve;
- a first computing section that computes a target intake pressure;
- a second computing section that computes a target intake air amount;
- a first control section that controls said electronically controlled throttle, to attain said target intake pressure;
- a second control section that controls said variable valve mechanism, to attain said target intake air amount;
- a detector detecting an intake pressure of said internal combustion engine;
- a correcting section that corrects the control by said second control section based on the intake pressure detected by said detector;
- a diagnosis section that judges whether or not the intake pressure detected by said detector is abnormal;
- and
- a limiting section that limits the correction by said correcting section when it is judged that the intake pressure detected by said detector is abnormal.
8 more elements
An intake control apparatus for an internal combustion engine, comprising:
- an electronically controlled throttle;
- a variable valve mechanism varying an opening characteristic of an intake valve;
- a first computing section that computes a target intake pressure;
- a second computing section that computes a target intake air amount;
- a first control section that controls said electronically controlled throttle, to attain said target intake pressure;
- a second control section that controls said variable valve mechanism, to attain said target intake air amount;
- a detector detecting an intake pressure of said internal combustion engine;
- a correcting section that corrects the control by said second control section based on the intake pressure detected by said detector;
- a diagnosis section that judges whether or not the intake pressure detected by said detector is abnormal;
- a third control section that controls said electronically controlled throttle to attain said target intake air amount, in place of said first control section, when it is judged that the intake pressure detected by said detector is abnormal;
- and
- a fourth control section that controls said variable valve mechanism based on a fixed target opening characteristic, in place of said second control section, when it is judged that the intake pressure detected by said detector is abnormal.
9 more elements
An intake control apparatus for an internal combustion engine, comprising:
- an electronically controlled throttle;
- a variable valve mechanism varying an opening characteristic of an intake valve;
- first computing means for computing a target intake pressure;
- second computing means for computing a target intake air amount;
- first control means for controlling said electronically controlled throttle, to attain said target intake pressure;
- second control means for controlling said variable valve mechanism, to attain said target intake air amount;
- detecting means for detecting an intake pressure of said internal combustion engine;
- correcting means for correcting the control by said second control means based on the intake pressure detected by said detecting means;
- diagnosis means for judging whether or not the intake pressure detected by said detecting means is abnormal;
- and
- limiting means for limiting the correction by said correcting means when it is judged that the intake pressure detected by said detecting means is abnormal.
8 more elements
An intake control apparatus for an internal combustion engine, comprising:
- an electronically controlled throttle;
- a variable valve mechanism varying an opening characteristic of an intake valve;
- first computing means for computing a target intake pressure;
- second computing means for computing a target intake air amount;
- first control means for controlling said electronically controlled throttle, to attain said target intake pressure;
- second control means for controlling said variable valve mechanism, to attain said target intake air amount;
- detecting means for detecting an intake pressure of said internal combustion engine;
- correcting means for correcting the control by said second control means based on the intake pressure detected by said detecting means;
- diagnosis means for judging whether or not the intake pressure detected by said detecting means is abnormal;
- third control means for controlling said electronically controlled throttle to attain said target intake air amount, in place of said first control means, when it is judged that the intake pressure detected by said detecting means is abnormal;
- and
- fourth control means for controlling said variable valve mechanism based on a fixed target opening characteristic, in place of said second control means, when it is judged that the intake pressure detected by said detecting means is abnormal.
9 more elements
An intake control method for an internal combustion engine provided with an electronically controlled throttle and a variable valve mechanism varying an opening characteristic of an intake valve, comprising the steps of:
- computing a target intake pressure;
- computing a target intake air amount;
- controlling said electronically controlled throttle, to attain said target intake pressure;
- controlling said variable valve mechanism, to attain said target intake air amount;
- detecting an intake pressure of said internal combustion engine;
- correcting the control of said variable valve mechanism based on the detection value of said intake pressure;
- judging whether or not the detection value of said intake pressure is abnormal;
- and
- limiting the correction of said variable valve mechanism when it is judged that the detection value of said intake pressure is abnormal.
6 more elements
An intake control method for an internal combustion engine provided with an electronically controlled throttle and a variable valve mechanism varying an opening characteristic of an intake valve, comprising the steps of:
- computing a target intake pressure;
- computing a target intake air amount;
- controlling said electronically controlled throttle, to attain said target intake pressure;
- controlling said variable valve mechanism, to attain said target intake air amount;
- detecting an intake pressure of said internal combustion engine;
- correcting the control of said variable valve mechanism based on the detection value of said intake pressure;
- judging whether or not the detection value of said intake pressure is abnormal;
- controlling said electronically controlled throttle to attain said target intake air amount, when it is judged that the detection value of said intake pressure is abnormal;
- and
- controlling said variable valve mechanism based on a fixed target opening characteristic, when it is judged that the detection value of said intake pressure is abnormal.
7 more elements
Dependencies are inferred from the claim text.