Unlock instant, AI-driven research and patent intelligence for your innovation.

A fault detection system for the low pressure exhaust gas recirculation circuit of an internal combustion engine

A technology of internal combustion engine and exhaust gas recirculation, which is applied in the direction of exhaust gas recirculation, engine testing, internal combustion piston engine, etc.

Active Publication Date: 2021-01-29
FPT IND
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, on the one hand, the performance in terms of the power / torque delivered by the internal combustion engine is increased, but on the other hand, it is no longer possible to adequately control / limit NOx emissions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A fault detection system for the low pressure exhaust gas recirculation circuit of an internal combustion engine
  • A fault detection system for the low pressure exhaust gas recirculation circuit of an internal combustion engine
  • A fault detection system for the low pressure exhaust gas recirculation circuit of an internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] refer to figure 1 , an internal combustion engine E with any number of cylinders, for example 4 or 6 cylinders - preferably a diesel cycle engine - is fitted with an intake manifold IP connected to the turbocharger group TC The outlet of compressor C. The air inlet of said compressor C is connected to the suction filter box F by a pipe FC.

[0018] Conduit RL connects a point of the low-pressure discharge line, ie at approximately ambient pressure, with a point of the suction line downstream of the low-pressure suction filter F, ie at approximately ambient pressure.

[0019] Between the suction filter box F and the connection point between the line RL and the line FC is arranged an air mass metering device HFM which is usually present on internal combustion engines.

[0020] As will be clearer below, the presence of the turbo compressor unit is optional.

[0021] The turbines T of the same group TC have an inlet connected to the exhaust manifold EP and an outlet conn...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method and a system for detecting failures of a detection system of a low-pressure exhaust gas recirculation circuit (RL) of an internal combustion engine, the method comprising the following steps: (step 1) obtaining data for measuring or estimating (λ and / or or NOx) the lambda value (λ measured ); (step 2) calculate the theoretical value of the air / fuel ratio (λ exp ), the theoretical value (λ exp ) is based on the measured or estimated amount of fresh air (m HFM ) and the amount of fuel (m FUEL ) to calculate; (step 3) calculating the error (λ between the measured value and the theoretical value of the air / fuel ratio err )(λ measured ‑λ exp ); (step 4) calculate / estimate the amount / flow of recirculated low-pressure exhaust gas (m EGR ); (step 5) calculate the amount (m EGR ) and the error (λ err ) linear regression; and (step 6) when the angle coefficient (b) of said linear regression exceeds a predetermined first positive threshold (b max ), a malfunction of the low-pressure exhaust gas recirculation circuit is signaled.

Description

technical field [0001] The invention relates to the field of internal combustion engines equipped with at least one exhaust gas recirculation duct at low pressure, and more particularly to a detection system for leaks of said low pressure EGR recirculation circuit. Background technique [0002] Emission regulations for internal combustion engines impose increasingly stringent emission limits and increasingly challenging certification cycles. One of the most influential pollutants to remain under regulatory control is nitrogen oxides (NOx): EGR (exhaust gas recirculation) systems are the systems used in most applications to reduce this pollutant. [0003] Possible faults include fresh air entering the low pressure EGR duct. [0004] In other words, instead of recirculating exhaust air, fresh air is brought in. Thus, on the one hand, the performance in terms of power / torque delivered by the internal combustion engine is increased, but on the other hand, it is no longer possi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02M26/49G01M15/10G01M3/26
CPCF02D41/0072G01M3/26G01M15/102F02D41/18F02M26/05F02M26/06F02M26/49Y02T10/40F02D41/00
Inventor 弗朗切斯科·德伦托法比奥·奥代洛乌戈·波齐
Owner FPT IND