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Method and apparatus for controlling the air-fuel ratio in an internal combustion engine

An internal combustion engine, air-fuel ratio technology, applied in the direction of internal combustion piston engine, combustion engine, engine control, etc., can solve problems such as reducing output energy

Active Publication Date: 2019-02-22
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This transient energy demand temporarily reduces the output energy available from the engine

Method used

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  • Method and apparatus for controlling the air-fuel ratio in an internal combustion engine
  • Method and apparatus for controlling the air-fuel ratio in an internal combustion engine
  • Method and apparatus for controlling the air-fuel ratio in an internal combustion engine

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Embodiment Construction

[0024] image 3 The principle of the two-stage change-sensitive control is schematically shown. image 3 Examination can be done as a schematic illustration of a method or arrangement. The inner control loop includes a variation sensitive controller 31 where it receives a measured index value from a sensor 103, compares the index value with a set point value, and generates a value affected by the actuator 104. This includes the functionality of a feedback controller in the sense that the control output that controls the state of the process 104. The control output is proportional to the difference found between the measured index value and the setpoint value, but this proportionality includes some sensitivity to changes: during (and / or immediately after) a change in the setpoint value fixed-point value change process), transient periods occur during which the proportionality differs from that under steady-state conditions. Specifically, the change sensitivity of the control...

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Abstract

An AFR control system for controlling an air-fuel ratio in an internal combustion engine, the AFR control system comprising: - a feedback controller (402) configured to compare a measured air mass index with a set point value ( 410) and generate a feedback control output (403); - a set point selector (404) configured to select a steady state set point value (405) based on known operating requirements; - a first a transient controller (407), the first transient controller configured to generate a transient setpoint offset (408) in response to a change in fuel demand of said internal combustion engine; and - a second transient a controller (411, 811), the second transient controller configured to generate a transient output in response to a change in said steady state setpoint value (405) or said setpoint value (410) offset (412, 812); wherein said setpoint value (410) is a combination of said steady state setpoint value (405) and said transient setpoint offset (408), and wherein said The output (414) of the AFR control system is a combination of said feedback control output (403) and said transient output offset (412, 812).

Description

technical field [0001] The present invention relates generally to the technology of internal combustion engines, such as large diesel engines. Specifically, the present invention relates to a manner of controlling the air-fuel ratio during and immediately after a change in the operating state. Background technique [0002] Many modern internal combustion engines, such as diesel engines, include a forced induction device such as a turbocharger or supercharger for forcing additional air into the combustion chamber. The air-fuel ratio, or AFR (abbreviated), describes the relative amounts of air and fuel delivered to the combustion chamber each cycle. AFR is an important parameter, and the value of the air-fuel ratio should be kept within specific limits to ensure proper engine operation. The importance of AFR control becomes even more pronounced in gas-fueled diesel engines because proper ignition and combustion of gaseous fuels is more closely dependent on AFR than in engine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/10F02D41/14F02D41/00
CPCF02D41/0007F02D41/10F02D41/1401F02D2041/1409F02D2041/1432Y02T10/12
Inventor 汤姆·凯丝弗雷德里克·奥斯特曼
Owner WARTSILA FINLAND OY