Apparatus for controlling internal combustion engine with supercharging device
First Claim
1. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:
- a throttle control device which controls a throttle valve;
a pressure sensor located in an induction system to detect an actual boost pressure;
a control unit being configured to be connected to the throttle control device for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
said control unit comprising (a) an arithmetic-calculation section which calculates a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator, (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and (d) an arithmetic-calculation section which compensates for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and determines the compensated target air quantity as a virtual target air quantity; and
a throttle actuator device which drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine.
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Accused Products
Abstract
An electronic engine control system of an internal combustion engine with a supercharging device operable to produce a desired boost pressure, includes an electronically-controlled throttle valve and a pressure sensor located in an induction system to detect an actual boost pressure. The system computes a target air quantity used in a stratified combustion mode or in a homogeneous lean combustion mode, based on at least an operated amount of an accelerator, and computes the desired boost pressure based on engine speed and engine load, and computes a boost-pressure correction factor as the ratio of the desired boost pressure to the actual boost pressure, during the stratified combustion mode or during the homogeneous lean combustion mode. An arithmetic-calculation section is also provided to compensate for the target air quantity by the boost-pressure correction factor during the stratified combustion mode or during the homogeneous lean combustion mode. The compensated target air quantity is determined as a virtual target air quantity. A throttle actuator device drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine, thus compensating for the response delay in boost-pressure change during acceleration/deceleration in the lean or ultra-lean combustion mode.
139 Citations
21 Claims
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1. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:
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a throttle control device which controls a throttle valve;
a pressure sensor located in an induction system to detect an actual boost pressure;
a control unit being configured to be connected to the throttle control device for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
said control unit comprising(a) an arithmetic-calculation section which calculates a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator, (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and (d) an arithmetic-calculation section which compensates for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and determines the compensated target air quantity as a virtual target air quantity; and
a throttle actuator device which drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine. - View Dependent Claims (3, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16)
(1) arithmetically calculating a driver-required air quantity (Qda) based on at least the operated amount (APS) of the accelerator;
(2) arithmetically calculating a required idle air quantity (Qia) based on at least an engine temperature (Tw) and needed to hold a stable engine idling operation;
(3) summing the driver-required air quantity (Qda) and the required idle air quantity (Qia) to generate a sum (Qda+Qia);
(4) setting the sum (Qda+Qia) as a basic target air quantity (tQaO);
(5) arithmetically calculating a target excess air factor (tλ
) based on engine operating conditions;
(6) compensating for the basic target air quantity (tQaO) by at least the target excess air factor (tλ
) to generate a compensated basic target air quantity; and
(7) determining the compensated basic target air quantity as the target air quantity (tQa) in the engine operating region of the lean air/fuel ratio.
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8. The apparatus as claimed in claim 1, wherein said throttle control device comprises:
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(1) an arithmetic-calculation section which calculates a target throttle opening area (Ath) based on the virtual target air quantity (tQad) and engine speed (Ne);
(2) an arithmetic-calculation section which calculates a target throttle opening (θ
th) based on the target throttle opening area (Ath); and
(3) outputting a controlled variable to the throttle valve, so that an actual throttle opening of the throttle valve is adjusted toward the target throttle opening (θ
th).
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9. The apparatus as claimed in claim 1, wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section:
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(1) arithmetically calculating a desired equilibrium boost pressure based on engine load and engine speed (Ne), and determining the desired equilibrium boost pressure as a basic boost pressure (tPc); and
(2) arithmetically calculating a basic-boost-pressure weighted average responsive to the basic boost pressure (tPc) with a first-order lag by using a weighted-average coefficient (Kp), and determining the basic-boost-pressure weighted average as the target boost pressure (Pcm).
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10. The apparatus as claimed in claim 9, wherein the weighted-average coefficient (Kp) is different depending on information regarding which combustion mode the engine is in.
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11. The apparatus as claimed in claim 9, wherein the weighted-average coefficient (Kp) is retrieved from a predetermined characteristic map showing how the weighted-average coefficient (Kp) varies relative to engine load and engine speed (Ne).
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12. The apparatus as claimed in claim 9, wherein the weighted-average coefficient (Kp) is looked up from a predetermined look-up table using a product (APS×
- Ne) of the operated amount (APS) of the accelerator and the engine speed (Ne) as a parameter, and showing how the weighted-average coefficient (Kp) varies relative to the product (APS×
Ne).
- Ne) of the operated amount (APS) of the accelerator and the engine speed (Ne) as a parameter, and showing how the weighted-average coefficient (Kp) varies relative to the product (APS×
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13. The apparatus as claimed in claim 10, which further comprises an arithmetic-calculation section which calculates a target excess air factor (tλ
- ) based on engine operating conditions, and wherein the weighted-average coefficient (Kp) is retrieved from a predetermined map using a product (APS×
Ne×
tλ
) of the operated amount (APS) of the accelerator, the engine speed (Ne) and target excess air factor (tλ
) as a parameter, and showing how the weighted-average coefficient (Kp) varies relative to the product (APS×
Ne×
tλ
).
- ) based on engine operating conditions, and wherein the weighted-average coefficient (Kp) is retrieved from a predetermined map using a product (APS×
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14. The apparatus as claimed in claim 1, which further comprises an arithmetic-calculation section which calculates a target excess air factor (tλ
- ) based on engine operating conditions, and wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section;
(1) arithmetically calculating a desired equilibrium boost pressure based on engine load and engine speed (Ne) in a homogeneous stoichiometric combustion mode, and determining the desired equilibrium boost pressure as a basic boost pressure (tPc);
(2) arithmetically calculating a homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3) responsive to the basic boost pressure (tPc) with a first-order lag by using a weighted-average coefficient (Kp3) for a homogeneous stoichiometric combustion mode, and determining the homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3) as the target boost pressure (Pcm) used at the homogeneous stoichiometric combustion mode;
(3) determining a product (Pcm3×
tλ
), obtained by multiplying the homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3) by the target excess air factor (tλ
) calculated during the stratified combustion mode, as the target boost pressure (Pcm) used at the stratified combustion mode; and
(4) determining a product (Pcm3×
tλ
), obtained by multiplying the homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3) by the target excess air factor (tλ
) calculated during the homogeneous-lean combustion mode, as the target boost pressure (Pcm) used at the homogeneous-lean combustion mode.
- ) based on engine operating conditions, and wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section;
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15. The apparatus as claimed in claim 1, wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section:
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(1) arithmetically calculating a desired equilibrium boost pressure based on engine load and engine speed (Ne), and determining the desired equilibrium boost pressure as a basic boost pressure (tPc); and
(2) arithmetically calculating a value responsive to the basic boost pressure (tPc) with a ramp response, and determining the value as the target boost pressure (Pcm).
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16. The apparatus as claimed in claim 1, which further comprises an arithmetic-calculation section which calculates a target excess air factor (tλ
- ) based on engine operating conditions, and wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section;
(1) arithmetically calculating a desired equilibrium boost pressure based on engine load and engine speed (Ne) in a homogeneous stoichiometric combustion mode, and determining the desired equilibrium boost pressure as a basic boost pressure (tPc);
(2) arithmetically calculating a homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3) responsive to the basic boost pressure (tPc) with a first-order lag by using a weighted-average coefficient (Kp3) for a homogeneous stoichiometric combustion mode;
(3) arithmetically calculating a product (Pcm3×
tλ
×
K) of the homogeneous-stoichiometric-combustion-mode basic-boost-pressure weighted average (Pcm3), the target excess air factor (tλ
) and a matching constant (K), and determining the product (Pcm3×
tλ
×
K) as the target boost pressure (Pcm).
- ) based on engine operating conditions, and wherein the arithmetic-calculation section, calculating the desired boost pressure (Pcm), comprises a data processing section;
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2. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:
-
a throttle control device which controls a throttle valve;
a pressure sensor located in an induction system to detect an actual boost pressure;
a control unit being configured to be electronically connected to the throttle control device for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
said control unit comprising(a) an arithmetic-calculation section which calculates a target air quantity based on at least the operated amount of the accelerator, (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, and (d) a determination section which determines whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio, and (e) an arithmetic-and-logic section which is responsive to a result determined by the determination section, for compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity and determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and for determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio; and
a throttle actuator device which drives the throttle valve, so that the virtual target air quantity is drawn into the engine. - View Dependent Claims (5, 7)
(1) arithmetically calculating a driver-required air quantity (Qda) based on at least the operated amount (APS) of the accelerator;
(2) arithmetically calculating a required idle air quantity (Qia) based on at least an engine temperature (Tw) and needed to hold a stable engine idling operation;
(3) summing the driver-required air quantity (Qda) and the required idle air quantity (Qia) to generate a sum (Qda+Qia);
(4) setting the sum (Qda+Qia) as a basic target air quantity (tQaO);
(5) arithmetically calculating a target excess air factor (tλ
) based on engine operating conditions;
(6) compensating for the basic target air quantity (tQaO) by at least the target excess air factor (tλ
) to generate a compensated basic target air quantity; and
(7) determining the compensated basic target air quantity as the target air quantity (tQa).
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17. In a computed-controlled internal combustion engine with a supercharging device operable to produce a desired boost pressure, an electronic engine control system for compensating for a response delay in boost-pressure change, comprising:
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a throttle control means for controlling a throttle valve;
a pressure sensing means located in an induction system for detecting an actual boost pressure;
a control unit being configured to be connected to the throttle control means for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
said control unit comprising(a) an arithmetic-calculation means for calculating a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator, (b) an arithmetic-calculation means for calculating the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation means for calculating a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and (d) an arithmetic-calculation means for compensating for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and for determining the compensated target air quantity as a virtual target air quantity; and
a throttle actuating means for driving the throttle valve, so that the virtual target air quantity is drawn into the engine.
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18. In a computed-controlled internal combustion engine with a supercharging device operable to produce a desired boost pressure, an electronic engine control system for compensating for a response delay in boost-pressure change, comprising:
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a throttle control means for controlling a throttle valve;
a pressure sensing means located in an induction system for detecting an actual boost pressure;
a control unit being configured to be connected to the throttle controlling means for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator;
said control unit comprising(a) an arithmetic-calculation means for calculating a target air quantity based on at least the operated amount of the accelerator, (b) an arithmetic-calculation means for calculating the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation means for calculating a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, and (d) a determination means for determining whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio, and (e) an arithmetic-and-logic means being responsive to a result determined by the determination section, for compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity and determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and for determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio; and
a throttle actuating means for driving the throttle valve, so that the virtual target air quantity is drawn into the engine.
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19. A method for compensating for a response delay in boost-pressure change in a computed-controlled internal combustion engine having a supercharging device operable to produce a desired boost pressure and a throttle valve whose throttle opening is arbitrarily controlled depending on an operated amount of an accelerator, the method comprising:
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detecting an actual boost pressure;
calculating a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator;
calculating the desired boost pressure based on engine speed and engine load;
calculating a boost-pressure correction factor as a ratio of the desired boost pressure to the actual boost pressure, in the engine operating region of the lean air/fuel ratio;
compensating for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity;
determining the compensated target air quantity as a virtual target air quantity; and
driving the throttle valve, so that the virtual target air quantity is drawn into the engine.
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20. A method for compensating for a response delay in boost-pressure change in a computed-controlled internal combustion engine having a supercharging device operable to produce a desired boost pressure and a throttle valve whose throttle opening is arbitrarily controlled depending on an operated amount of an accelerator, the method comprising:
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detecting an actual boost pressure;
calculating a target air quantity based on at least the operated amount of the accelerator;
calculating the desired boost pressure based on engine speed and engine load;
calculating a boost-pressure correction factor as a ratio of the desired boost pressure to the actual boost pressure;
determining whether the engine is in an operating region of a lean air/fuel ratio or in an operating region of a stoichiometric air/fuel ratio;
compensating for the target air quantity by the boost-pressure correction factor to generate a compensated target air quantity;
determining the compensated target air quantity as a virtual target air quantity when the engine is in the operating region of the lean air/fuel ratio, and determining the target air quantity itself as the virtual target air quantity when the engine is in the operating region of the stoichiometric air/fuel ratio; and
driving the throttle valve, so that the virtual target air quantity is drawn Into the engine.
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21. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:
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a throttle control device which controls an electronically-controlled throttle valve;
a pressure sensor located in an induction system to detect an actual boost pressure;
a control unit being configured to be electronically connected to the throttle control device for arbitrarily controlling a throttle opening of the electronically-controlled throttle valve depending on an operated amount of an accelerator;
said control unit comprising(a) an arithmetic-calculation section which calculates a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator, (b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load, (c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and (d) an arithmetic-calculation section which compensates for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and determines the compensated target air quantity as a virtual target air quantity; and
a throttle actuator device which drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine.
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Specification