Control apparatus for internal combustion engine
First Claim
1. A control apparatus for an internal combustion engine, for feedback controlling an input of a subject to be controlled in an internal combustion engine so that an output of the subject to be controlled coincides with a final target value, comprising:
- intermediate target value setting means for setting an intermediate target value on the basis of the output of the subject to be controlled and the final target value; and
feedback control means for calculating a correction amount of the input of the subject to be controlled on the basis of the output of the subject to be controlled and the intermediate target value.
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Accused Products
Abstract
An intermediate target value calculating unit calculates an intermediate target value φmidtg(i) on the basis of an output φ(i−1) of an A/F ratio sensor in computation of last time and a final target value φtg(i). By the computation, the intermediate target value φmidtg(i) is set between the output φ(i−1) of the A/F ratio sensor in computation of last time and the final target value φtg(i). A correction amount calculating unit calculates a correction amount AFcomp(i) of the target A/F ratio on the basis of a deviation Δφ(i) between the intermediate target value φmidtg(i) and the output φ(i) of the A/F ratio sensor. Consequently, the control is hard to be influenced by variations in waste time of the subject to be controlled and an error in modeling. While maintaining the stability of the A/F ratio feedback control, higher gain can be achieved and robustness can be also increased.
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Citations
27 Claims
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1. A control apparatus for an internal combustion engine, for feedback controlling an input of a subject to be controlled in an internal combustion engine so that an output of the subject to be controlled coincides with a final target value, comprising:
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intermediate target value setting means for setting an intermediate target value on the basis of the output of the subject to be controlled and the final target value; and
feedback control means for calculating a correction amount of the input of the subject to be controlled on the basis of the output of the subject to be controlled and the intermediate target value. - View Dependent Claims (2, 3, 4, 5, 6)
the intermediate target value setting means sets an intermediate target value of a deviation on the basis of a deviation of last time between an output of the subject to be controlled and the final target value, and the feedback control means calculates a correction amount of an input of the subject to be controlled on the basis of a deviation between the output of the subject to be controlled and the final target value and the intermediate target value.
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7. An exhaust gas A/F ratio control apparatus for an internal combustion engine, comprising:
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a catalyst for treating an exhaust gas of an internal combustion engine;
an upstream-side exhaust gas sensor and a downstream-side exhaust gas sensor for detecting A/F ratio or rich/lean of the exhaust gas on the upstream and downstream sides of the catalyst, respectively;
exhaust gas A/F ratio feedback control means for feedback-controlling a fuel injection amount so that an A/F ratio detected by the upstream-side exhaust gas sensor becomes equal to an upstream-side target exhaust gas A/F ratio; and
sub-feedback control means for correcting the upstream-side target exhaust gas A/F ratio so that an exhaust gas A/F ratio detected by the downstream-side exhaust gas sensor becomes equal to a downstream-side target exhaust gas A/F ratio, wherein the sub-feedback control means has back stepping control means for calculating a correction amount of the upstream-side target exhaust gas A/F ratio on the basis of a state variable obtained from an exhaust gas A/F ratio detected by the downstream-side exhaust gas sensor by using a back stepping method. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An exhaust gas A/F ratio control apparatus for an internal combustion engine, comprising:
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a catalyst for treating exhaust gases of an internal combustion engine;
an upstream-side exhaust gas sensor and a downstream-side exhaust gas sensor for detecting A/F ratio or rich/lean of an exhaust gas on the upstream and downstream sides of the catalyst, respectively;
exhaust gas A/F ratio feedback control means for feedback controlling a fuel injection amount so that an A/F ratio detected by the upstream-side exhaust gas sensor becomes equal to an upstream-side target exhaust gas A/F ratio;
sub feedback control means for performing sub feedback control for correcting the upstream-side target exhaust gas A/F ratio so that an exhaust gas A/F ratio detected by the downstream-side exhaust gas sensor becomes a downstream-side target exhaust gas A/F ratio; and
intermediate target value setting means for setting an intermediate target value of the sub feedback control on the basis of the exhaust gas A/F ratio detected by the downstream-side exhaust gas sensor and a final downstream-side target exhaust gas A/F ratio, wherein the sub feedback control means calculates a correction amount of the upstream side target exhaust gas A/F ratio on the basis of the exhaust gas A/F ratio detected by the downstream-side exhaust gas sensor and the intermediate target value. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A control apparatus for an internal combustion engine, comprising feedback control means for feedback-controlling an input of a subject to be controlled of an internal combustion engine so that an output of the subject to be controlled coincides with a target value, wherein
the feedback control means has: - proportional derivative means for calculating a correction amount of an input of the subject to be controlled by proportional derivative control in which a gain of a differential term is higher than a gain of a proportional term; and
regulating means for regulating the correction amount calculated by the proportional derivative means so as to be within a predetermined range. - View Dependent Claims (20)
- proportional derivative means for calculating a correction amount of an input of the subject to be controlled by proportional derivative control in which a gain of a differential term is higher than a gain of a proportional term; and
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21. An exhaust gas A/F ratio control apparatus for an internal combustion engine, in which a sensor for detecting A/F ratio or rich/lean of exhaust gas is disposed on each of the upstream side and the downstream side of a catalyst for treating exhaust gases disposed in an exhaust path of an internal combustion engine, comprising:
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exhaust gas A/F ratio feedback control means for feedback controlling an exhaust gas A/F ratio on the upstream side of the catalyst on the basis of an output of the upstream side sensor;
sub feedback control means for performing sub feedback control for reflecting an output of the downstream side sensor into the feedback control on the exhaust gas A/F ratio on the upstream of the catalyst; and
parameter varying means for variably setting at least one of parameters of the sub feedback control in accordance with a deviation between the exhaust gas A/F ratio on the upstream side of the catalyst and a theoretical exhaust gas A/F ratio. - View Dependent Claims (22, 23, 24, 25, 26)
the parameter variably set by the parameter varying means is an integral term and/or a skip term, and the sub feedback control means corrects the target exhaust gas A/F ratio of the feedback control on the exhaust gas A/F ratio on the upstream side of the catalyst by using the integral term and the skip term. -
26. An exhaust gas A/F ratio control apparatus for an internal combustion engine according to claim 21, wherein
the upstream side sensor detects the A/F ratio of the exhaust gas, and the downstream side sensor detects the rich/lean of the exhaust gas.
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27. An exhaust gas A/F ratio control apparatus for an internal combustion engine, in which a sensor for detecting A/F ratio of exhaust gas is disposed on each of the upstream side and the downstream side of a catalyst for treating exhaust gases disposed in an exhaust path of an internal combustion engine, comprising:
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exhaust gas A/F ratio feedback control means for feedback controlling an exhaust gas A/F ratio on the upstream side of the catalyst on the basis of an output of the upstream side sensor;
sub feedback control means for performing sub feedback control for reflecting an output of the downstream side sensor into the feedback control on the exhaust gas A/F ratio on the upstream of the catalyst; and
parameter varying means for fixing at least one of parameters of the sub feedback control to a predetermined value smaller than a maximum value of the parameter within a predetermined range when a deviation between the exhaust gas A/F ratio on the upstream side of the catalyst and a theoretical exhaust gas A/F ratio is out of the predetermined range.
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Specification