EP0185552A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for controlling operating state of an internal combustion engine
Assignee: OFFERTA DI LICENZA AL PUBBLICO
•
Filing: 1985-12-19
•
Granted: —
•
Expires: 2005-12-19
Abstract
Abstract Apparatus for controlling oprating state of an internal combustion engine (M1), comprises a demand amount detecting unit (M2) for detecting amount of demand to the engine, an operating condition varying unit (M3) for varying condition of operation of the engine, an operating state detecting unit (M4) for detecting operating state of the engine, a target value setting unit (M5) for determinng target values of variables of the operating condition, a control unit (M6) for controlling the operating condition varying unit (M3) by determining feedback amount of the operating condition variables so that detected values equal to the target values. In such apparatus, the target value setting unit (M5) is constructed such that a target intake air quantity is determined as a value with which fuel supply amount becomes minimum on the basis of the correlation between intake air quantity and fuel supply amount when output torque is made constant, and the control unit (M6) is constructed as an integral-added optimal regulator which determines the feedback amount on the basis of an optimal feedback gain predetermined in accordance with dynamic model of a system relating to the operation of the internal combustion engine.
Inventors
- 👤 Eiichi Kamei
- 👤 Hideaki Namba
- 👤 Mitsunori Takao
- 👤 Masahiro Ohba
- 👤 Masao Yonekawa
- 👤 Masashi Kiyono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 21:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D43/00; F02B; F02B1/00; F02B1/02; F02B1/04; F02D2041/1413; F02D2041/1415; F02D2041/1416; F02D2041/1426; F02D2041/1433
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
265 words
Apparatus for controlling operating state of an internal combustion engine comprising: demand amount detecting means for detecting demand amount including at least the manipulation amount of an accelerator as an amount of damand for the operation of said internal combustion engine; operating condition varying means for varying variables of operating condition including at least fuel supply amount and throttle valve opening degree as condition of operation of said internal combustion engine; operating state detecting means for detecting variables of operating state including at least intake air quantity, rota- tonal speed and output torque as the operaring state of said internal combustion engine; target value setting means for determining respective target values of operating condition variables including at least target output torque and target intake air quantity using said demand amount detected; control means for controlling said operating condition varying means by determining feedback amount of said operating condition variables so that variables of the detected operating state of said internal combustion engine are equal to said determined target values; characterized in that said target value setting means is constructed such that said target intake air quantity is determined as an intake air quantity with which said fuel supply amount becomes minimum on the basis of the correlation between intake air quantity and fuel supply amount when output torque is made constant; and in that said control means is constructed as an integral-added optimal regulator which determines said feedback amount on the basis of an optimal feedback gain predetermined in accordance with dynamic model of a system relating to the operation of said internal combustion engine.
Claim 2
Dependent Claim
265 words
Apparatus for controlling operating state of an internal combustion engine comprising: demand amount detecting means for detecting demand amount including at least the manipulation amount of an accelerator as an amount of damand for the operation of said internal combustion engine; operating condition varying means for varying variables of operating condition including at least fuel supply amount and throttle valve opening degree as condition of operation of said internal combustion engine; operating state detecting means for detecting variables of operating state including at least intake air quantity, rota- tonal speed and output torque as the operaring state of said internal combustion engine; target value setting means for determining respective target values of operating condition variables including at least target output torque and target intake air quantity using said demand amount detected; control means for controlling said operating condition varying means by determining feedback amount of said operating condition variables so that variables of the detected operating state of said internal combustion engine are equal to said determined target values; characterized in that said target value setting means is constructed such that said target intake air quantity is determined as an intake air quantity with which said fuel supply amount becomes minimum on the basis of the correlation between intake air quantity and fuel supply amount when output torque is made constant; and in that said control means is constructed as an integral-added optimal regulator which determines said feedback amount on the basis of an optimal feedback gain predetermined in accordance with dynamic model of a system relating to the operation of said internal combustion engine.
Claim 3
Dependent Claim
175 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 1, wherein said control means is constructed as an integral-added optimal regulator having: a state observing unit for estimating state variables of appropriate order indicative of dynamic internal state of the system using operating state and opeating condition of said internal combustion engine using parameters predetermined on the basis of the dynamic model of the system relating to the operation of said internal combustion engine; an accumulating unit for accumulating respective differences between the target values of the operating state variables determined by said target value setting means and said detected operating state variables, in connection with at least output torque and intake air quantity; and a feedback amount determining unit for determining respective controlled variable of operating condition including at least fuel supply amount and throttle opening degree which are controlled by said operating condition varying means using the feedback gain predetermined on the basis of the dynamic model of said system, said estimated state variables, and said accumulated value.
Claim 4
Dependent Claim
58 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 2, wherein it is arranged such that the parameters of said state observing unit and/or the feedback gain of said feedback amount determing unit can be switched in response to the change in the dynamic model of the system of said internal combustion engine.
Claim 5
Dependent Claim
36 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 3, wherein the switching of said parameters and/or feedback gain is performed depending on temperature of coolant of the internal combustion engine.
Claim 6
Dependent Claim
36 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 4, wherein the switching of said parameters and/or feedback gain is performed with a given hysteresis width of the temperature of coolant
Claim 7
Dependent Claim
76 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 1, wherein said target value setting means is arranged to determine intake air quantity from output torque and rotational speed of said internal combustion engine using a map prepared in advance when determining target intake air quantity, and to start searching a target intake air quantity which causes fuel supply amount to be minimum using said intake air quantity as a base.
Claim 8
Dependent Claim
51 words
Apparatus for controlling operating state of an internal combustion engine as claimed in Claim 6, wherein it is arranged that values of said map are renewed to predetermined target intake air quantities when a predetermined target intake air quantity is different from the value of intake air quantity of said map.
Claim 9
Dependent Claim
108 words
Apparatus for controlling operation of an intemal combustion engine, comprising means for determining target operating variables as a function of demands applied by our operator and feed back control means for adjusting operating condition variables such that the actual operating state corresponds to the target variables wherein the target determining means is arranged to determine a target intake air quantity corresponding to that required for minimum fuel supply at constant output torque; and wherein the operating condition variables are adjusted by an integral-added optimal regulator for optimising the feedback to the control means in accordance with a dynamic model relating to the operation of the internal combustion engine.
Claim 10
Dependent Claim
108 words
Apparatus for controlling operation of an intemal combustion engine, comprising means for determining target operating variables as a function of demands applied by our operator and feed back control means for adjusting operating condition variables such that the actual operating state corresponds to the target variables wherein the target determining means is arranged to determine a target intake air quantity corresponding to that required for minimum fuel supply at constant output torque; and wherein the operating condition variables are adjusted by an integral-added optimal regulator for optimising the feedback to the control means in accordance with a dynamic model relating to the operation of the internal combustion engine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.