Method and apparatus for controlling variable valve actuation device in internal combustion engine
AssigneeHitachi, Ltd.
InventorsKenichi Machida, Hidekazu Yoshizawa
Life of this patent
Estimating the term…
Abstract
In a V-type engine provided with a variable valve timing mechanism and variable valve lift mechanism for an intake valve, a torque difference between respective banks is obtained. In a region in which an opening area of the intake valve is larger than a threshold, valve timing of the intake valve by the variable valve timing mechanism is corrected so as to reduce the torque difference, whereas in a region in which the opening area of the intake valve is smaller than the threshold, lift characteristics of the intake valve by the variable valve lift mechanism is corrected so as to reduce the torque difference.
Claims31
A variable valve actuation control apparatus for an internal combustion engine, comprising:
- a variable valve actuation device which varies a phase of the center of an operating angle of an intake valve and lift characteristics thereof;
- a first learning section that learns an error in intake air quantity which depends on said phase;
- a second learning section that learns an error in intake air quantity which depends on said lift characteristics;
- a selecting section that operates either said first learning section or said second learning section, based on a quantity of state of an intake system in said engine;
- and
- a control section that controls said variable valve actuation device, based on said learned errors in intake air quantity.
A variable valve actuation control apparatus for an internal combustion engine, comprising:
- variable valve actuation means for varying a phase of the center of an operating angle of an intake valve and lift characteristics thereof;
- first learning means for learning an error in intake air quantity which depends on said phase;
- second learning means for learning an error in intake air quantity which depends on said lift characteristics;
- selecting means for operating either said first learning means or said second learning means, based on a quantity of state of an intake system in said engine;
- and
- control means for controlling said variable valve actuation device, based on said learned errors in intake air quantity.
A control method of a variable valve actuation device which varies a phase of the center of an operating angle of an intake valve and lift characteristics thereof, in an internal combustion engine, comprising the steps of:
- determining whether a quantity of sate of an intake system in said engine corresponds to a first region in which an error in intake air quantity which depends on said phase is learned or a second region in which an error in intake air quantity which depends on said lift characteristics is learned;
- learning the error in intake air quantity which depends on said phase, when it is determined that said quantity of sate corresponds to said first region;
- learning the error in intake air quantity which depends on said lift characteristics, when it is determined that said quantity of state corresponds to said second region;
- and
- controlling said variable valve actuation device, based on said learned errors in intake air quantity.
Dependencies are inferred from the claim text.