Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Reexamination Certificate
1999-12-30
2001-10-16
Solis, Erick (Department: 3747)
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
C123S361000
Reexamination Certificate
active
06302084
ABSTRACT:
TECHNICAL FIELDS
The present invention relates to a control method and control apparatus of a throttle valve used for an internal combustion engine for a vehicle, etc.
BACKGROUND OF THE INVENTION
JP B 56-37414 discloses a control apparatus of a throttle valve which calculates a target opening of the throttle valve on the basis of engine speed and required engine torque, and controls so that a real throttle valve opening becomes a target opening.
Further, JP A 7-332136 discloses a throttle valve control apparatus of an internal combustion engine, which is provided with a throttle valve driving means for driving a throttle valve inserted in an engine intake system, a target opening setting means for setting a target opening of the throttle valve, a throttle valve opening detecting means for detecting an opening of the throttle valve, and an opening-closing control means computing a feedback control quantity including a proportional part using a difference between a target opening set by the target opening setting means and a detection opening detected by the throttle valve opening detecting means, driving the throttle driving means on the basis of the calculation result and effecting feedback control so as to cause the throttle valve to approach the target opening, wherein a proportional part gain changing means is provided in which a gain relating to the proportional part is made larger as the above-mentioned difference becomes smaller.
Still further, JP A 8-144820 discloses a throttle valve control apparatus of an internal combustion engine, which obtains a target opening of a throttle valve provided in an intake passage of the internal combustion engine mounted on a vehicle on the basis of required engine torque calculated according to engine speed and various conditions of the vehicle and electrically controls so that a real throttle valve opening becomes the above-mentioned target opening, and which is characterized by comprising an intake pressure detecting means for detecting intake pressure in the intake passage, a target intake pressure computing means for computing a target intake pressure in the intake passage according to the engine speed and required engine torque, and a correcting means for comparing the above-mentioned target intake pressure and a detection intake pressure and correcting the above-mentioned target opening according to the result.
Those official publications disclose the proportional part gain changing means or means for improving the response of the throttle valve by correcting an target opening calculated by an engine control unit itself.
However in the case of these methods, since motor driving duty is calculated using a certain constant fixed for operation of the throttle valve, the overall response is improved but an influence on the response of the throttle valve due to external or secular change or manufacturing variations in the products has not been improved as yet.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a control method and control apparatus of a throttle valve of an engine which is able to reduce an influence on response of the throttle vane due to secular change or manufacturing variations in products, and attain an excellent response.
According to an aspect of the present invention, a reference target opening of the throttle valve set according to operational conditions of the vehicle and a real opening of the throttle valve are compared. A correction quantity for correcting the reference target opening is obtained, corresponding to the difference obtained as a result of the comparison. A target opening corrected to have a larger value than the reference target opening is set on the basis of the correction quantity.
Since the target opening corrected on the basis of the correction quantity is set a value larger than the reference target opening of the throttle valve, it is possible to improve a response speed of the throttle valve by controlling the throttle valve with a control signal generated on the basis of the corrected target opening.
Preferably, every time the reference target opening is changed, the correction quantity of the target opening is reset in turn according to difference between a real opening and the changed reference target opening.
Further, preferably, the correction quantity of the target opening can be obtained as a value of the difference multiplied by a constant. The constant is set a larger value as the difference becomes smaller. That is, the smaller the difference, the larger the set correction quantity of the target opening.
Further, preferably, when any one of a time having passed from the time the target opening is set, an overshoot quantity of a real opening to the reference target opening and a difference between the corrected target opening and the real opening reaches a predetermined value or more, the corrected target opening is set as the reference target opening.
Further, preferably, when a reference target opening signal was changed to a new reference target opening signal during opening control based on the corrected target opening, the corrected target opening is canceled, a new corrected target opening is set based on a difference between the new reference target opening and a real opening.
Further, preferably, the reference target opening is given from an engine control unit, and when the reference target opening changes, the corrected target opening is set.
Further, preferably, a suitable correction quantity of the target opening is selected from a plurality of predetermined values according to a difference between the reference target opening and a real opening.
According to another aspect of the present invention, a control apparatus of an throttle valve of an engine is provided with a reference target opening setting section outputting an opening of the throttle valve, set according to conditions of the engine as a reference target opening, a real opening detecting section detecting a real opening position of the throttle valve and outputting it, and a control target opening setting section computing a control target opening according to a difference between a reference target opening outputted by the reference target opening setting section and a real opening outputted by the real opening detecting section. The control target opening setting section has a target opening correction quantity operation section computing a correction quantity for correcting the reference target opening according to a difference between the reference target opening and the real opening.
Preferably, the above-mentioned control target opening setting section further has a corrected target opening operation section computing a corrected target opening from the computed correction quantity and a real opening.
Further, preferably, the above-mentioned control target opening setting section has a control target opening operation section selecting which to take a target opening as a control target opening or to take a reference target opening as a control target opening, in addition to the corrected target opening operation section.
Preferably, at least one part of the control target opening setting section is composed of an arithmetic program stored in a memory of a microcomputer for controlling an engine.
Further, preferably, at least one part of the control target opening setting section is composed of an arithmetic program stored in a memory of a microcomputer for controlling a throttle valve, different from the engine control microcomputer.
Here, that at least one part of the control target opening setting section is composed of an arithmetic program means, for example, that the target opening correction quantity operation section can be constructed as a map that a relationship between differences and target opening correction quantities is memorized beforehand in a memory, or a timer is constructed as hardware construction.
Preferably, the previously mentioned control target opening operation section sets a reference target opening as a control target opening when any one o
Kamimura Yasuhiro
Sasaki Yasushi
Tomita Norio
Crowell & Moring LLP
Hitachi , Ltd.
Solis Erick
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