US 4,732,003 A · Method of controlling supercharging pressure in turbocharger and apparatus for same

Abstract

A turbocharger including an exhaust turbine and a compressor is controlled using a variable geometry apparatus at the inlet of the exhaust turbine and an exhaust bypass valve bypassing the exhaust turbine. Operating conditions of the engine driven by the turbocharger are detected as is the supercharging pressure produced by the compressor. A deviation between the detected supercharging pressure and a target supercharging pressure is calculated and integrated. A controlled variable is calculated for actuating at least one of the variable geometry apparatus and the exhaust bypass valve based on the operating conditions and a learned value. Feedback control is used to correct the controlled variable in accordance with the integrated value of the deviation. A determination is made as to an operating range in which feedback control is to be performed and the learning amount is calculated in accordance with the result of the operating range determination and the integrated value of the deviation.

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Drawings

Claims14

Dependent claims

An apparatus, comprising:

an exhaust turbine having an inlet for receiving exhaust gas from an operating system, said inlet having a cross sectional area,
a compressor powered by said exhaust turbine for supplying a supercharging pressure to said operating system,
a variable geometry means for adjusting the cross sectional area of said inlet to said exhaust turbine,
an exhaust bypass valve means for providing an exhaust path bypassing said exhaust turbine,
an operation detecting means which detects operating conditions of said operating system,
a supercharging pressure detecting means which detects said supercharging pressure,
a deviation calculating means which calculates a deviation between the detected supercharging pressure and a target supercharging pressure and provides an integrated value of said deviation,
a controlled variable determination means which determines a controlled variable for actuating at least one of said variable geometry means and said exhaust bypass valve means based on said operating conditions,
a feedback correction means which operates to perform feedback correction of said controlled variable in accordance with a previously determined learning amount and said integrated value of said deviation to produce a corrected controlled variable,
a control means which controls at least one of said variable geometry means and said exhaust bypass valve means in accordance with said corrected controlled variable,
an operating range discriminating means which determines an operating range in which feedback control of said at least one of said variable geometry means and said exhaust bypass valve means is to be performed, and
a learning amount calculating means which calculates a new learning amount in relation to at least one of said variable geometry means and said exhaust bypass valve means in accordance with the result of the operating range determining made by said operating range discrimination means and said integrated value of said deviation, so that the controlled variable is corrected in future operations of said feedback correction means based on said new learning amount used as said previously determined learning amount.

9 more elements

An apparatus, comprising:

an exhaust turbine having an inlet with a cross section for receiving exhaust from an operating system,
a compressor driven by said exhaust turbine for providing a supercharge pressure to said operating system,
a variable geometry means for changing the cross section of said inlet to said exhaust turbine,
an exhaust bypass valve means for providing an exhaust path bypassing said exhaust turbine,
an operation detecting means which detects operating conditions of said operating system,
a supercharging pressure detecting means which detects said supercharging pressure,
a deviation calculating means which calculates a deviation between the detected supercharging pressure and a target supercharging pressure and provides an integrated value of said deviation,
first and second controlled variable calculating means for calculating first and second controlled variables for operating, respectively, said variable geometry means and said exhaust bypass valve means in accordance with said detected operating conditions,
first and second feedback correction means which correct said first and second controlled variables in accordance with said integrated value of said deviation and in accordance with a previously determined learning amount to provide first and second corrected controlled variables,
first and second control means which control said variable geometry means and said exhaust bypass valve means in accordance with said first and second corrected controlled variables,
an operating range discriminating means for determining an operating range in which feedback control is to be performed and selecting whether to perform feedback control of said variable geometry means or said exhaust bypass valve means,
first and second learning amount calculating means which calculate new first and second learning amounts in relation to the variable geometry means and exhaust bypass valve means, respectively, in accordance with the result of said operating range determination and said integrated value of said deviation, so that said first and second controlled variables are corrected in future operations of said first and second feedback correction means based on said new learning amounts used as said previously determined learning amounts, and
a means for controlling the timing of said calculation of said new learning amounts to effectively operate said variable geometry means and said exhaust bypass valve means.

10 more elements

A method, comprising:

driving an exhaust turbine by providing exhaust from an operating system to an inlet of said exhaust turbine,
driving a compressor with said exhaust turbine to produce a supercharge pressure for said operating system,
providing a variable geometry means for adjusting the cross section of said inlet to said exhaust turbine,
providing an exhaust bypass valve means for bypassing said exhaust turbine,
detecting operating conditions of said operating system,
detecting said supercharging pressure,
calculating a deviation between the detected supercharging pressure and a target supercharging pressure,
calculating a controlled variable for at least one of said variable geometry means and said exhaust bypass valve means based on said operating conditions,
feedback control correcting said controlled variable in accordance with said deviation and a previously determined learning amount to provide a corrected controlled variable,
controlling at least one of said variable geometry means and said exhaust bypass valve means in accordance with said corrected controlled variable,
determining an operating range in which feedback control of at least one of said variable geometry means and said exhaust bypass valve means is to be carried out,
calculating an integrated value of said deviation, and
calculating a new learning amount in relation to at least one of said variable geometry means and said exhaust bypass valve means in accordance with the result of the operating range determination and said integrated value of said deviation to correct the controlled variable in the future on the basis of said new learning amount used as said previously determined learning amount.

10 more elements

A method, comprising:

driving an exhaust turbine with exhaust from an operating system by supplying said exhaust to an inlet of said exhaust turbine,
driving a compressor with said exhaust turbine for producing a supercharging pressure,
providing a variable geometry means for adjusting a cross section of said inlet to said exhaust turbine,
providing an exhaust bypass valve means bypassing said exhaust turbine,
detecting operating conditions of said operating system,
detecting said supercharging pressure,
calculating a deviation between the detected supercharging pressure and a target supercharging pressure,
integrating said deviation,
calculating first and second controlled variables for actuating, respectively, said variable geometry means and said exhaust bypass valve means in accordance with said operating conditions,
feedback correcting said first and second controlled variables in accordance with said integrated value of said deviation and a previously determined learning amount to provide first and second corrected controlled variables,
controlling said variable geometry means and exhaust bypass valve means in accordance with said first and second corrected controlled variables,
determining an operating range in which to perform feedback control of said variable geometry means and said exhaust bypass valve means, and selecting whether to perform feedback control of said variable geometry means or exhaust bypass valve means,
calculating new learning amounts in relation to said variable geometry means and exhaust bypass valve means in accordance with the result of said operating range determination and said integrated value of said deviation, so that said first and second controlled variables are corrected in the future based on said new learning amounts used as said previously determined learning amounts, and
adjusting the timing of said calculation of said first and second new learning amounts to effectively operate said variable geometry means and exhaust bypass valve means.

11 more elements

Dependencies are inferred from the claim text.

Description14,058 words

Summary1,616 words

#This invention relates to a supercharging pressure control mechanism in a turbocharger.

#A turbocharger uses the high temperature and high pressure energy of the exhaust gas to turn an exhaust turbine at high speed. The exhaust turbine is coaxial with and helps drive the compressor. Along with increasing the rpm of the compressor, it is also capable of raising the pressure in the air intake manifold so that it is greater than atmospheric pressure. From this supercharging pressure, a large volume of intake air can be supplied to the engine.

#For a vehicle engine with a wide range of rpm speeds, in the medium-to-high speed operating range a sufficient supply of supercharging pressure can be maintained. However in the low speed operating range it is difficult to obtain a sufficient amount of exhaust pressure. Therefore, supercharging pressure cannot be obtained. This leads to an insufficient low speed torque.

Brief description of the drawings22 figures

#FIG. 1 is a diagram showing a whole structure incorporating a first example of this invention;

#FIG. 2 is a diagram showing a whole structure of a second example of this invention;

#FIG. 3 is a diagram showing a whole structure of a third example of this invention;

Detailed description12,051 words

#FIGS. 1 to 3 are a diagram of the whole structure of first to third examples of this invention, respectively. Operation condition detecting means 1 detects operating conditions of engine 15. It detects a parameter representative of the operating condition such as the air intake quantity. Supercharging pressure detecting means 2 detects the actual supercharging pressure of the turbocharger compressor (not shown in FIGS. 1 to 3).

#In the first example of FIG. 1, a controlled variable calculating means 3 computes the amount of control corresponding to at least one of a variable geometry means 9, and an exhaust bypass valve means (not shown) of an exhaust gas turbine, based on the previously discussed operating conditions. A feedback correction means 5 provides feedback correction for a controlled variable corresponding to the integrated value of the deviation determined by deviation calculation means 11, discussed below. A control means 7 controls at least one of the variable geometry means 9 and the exhaust bypass valve corresponding to the previously discussed controlled variable. The deviation calculating means 11 calculates an integrated value of deviation of the actual supercharging pressure from a target supercharging pressure as an operationg condition. An operating range discriminating means 12 discriminates or decides the operating region where feedback control is carried out.

#With this example of the present invention, a learning amount calculating means 13 computes the amount of learning for at least one of the variable geometry means 9 and the exhaust gas bypass, valve corresponding to the decision results for the previously discussed operating region and the integrated value of the previously discussed deviation. Then, the feedback correction means 5 provides correction for the previously mentioned controlled variable, based on this learning amount.

Facts

Application

06/807,225Filed 10 Dec 1985

Priority

JP 59-26141611 Dec 1984

Granted

22 Mar 1988

Term ended

10 Dec 2005

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification10 codes

F02B 37/18
Control of the pumps: by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
F02B 37/22
Control of the pumps: by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying…
F02D 41/0007
Controlling intake air: for control of turbo-charged or super-charged engines
F02D 41/10
Introducing corrections for particular operating conditions: for acceleration

Method of controlling supercharging pressure in turbocharger and apparatus for same

Life of this patent

Method of controlling supercharging pressure in turbocharger and apparatus for same

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims14

Description14,058 words

Drawings

Description14,058 words

Classification10 codes

Life of this patent