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Determining size of leak in fuel tank system

A technology for fuel tanks and leaks, applied in the field of vehicle diagnosis, can solve the problems of less idling phase, increased consumption, and inability to perform diagnosis frequently

Pending Publication Date: 2022-07-15
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the case of modern vehicles there are seldom enough long idling phases due to stop / start operation that diagnostics cannot be performed often
In order to be able to run the diagnostics, the stop / start operation must then be disabled, which of course increases the consumption

Method used

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  • Determining size of leak in fuel tank system
  • Determining size of leak in fuel tank system

Examples

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Embodiment Construction

[0031] figure 1A flowchart is shown of a method 100 according to the invention for determining the size of a leak in a fuel tank system of a vehicle with an internal combustion engine. At 102 , the internal combustion engine of the vehicle is started and at 104 one or more parameter values ​​are determined, which are decisive for the further method sequence. These parameter values ​​may in particular be the parking time of the vehicle, ie how long the vehicle has been parked before starting 102, and / or the difference between the fuel temperature in the tank system and the ambient temperature. Importantly, a statement about the quiescence and stability of the fuel in the tank can be derived from the parameter value / values. It is then checked (using the determined parameter value) whether at least one of the plurality of diagnostic conditions is satisfied at 106 . If the parking time is longer than the predetermined minimum parking time, for example, a first diagnosis conditio...

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Abstract

The invention relates to a method for determining the size of a leak in a fuel tank system of a vehicle having an internal combustion engine, comprising: starting (102) the internal combustion engine, determining (104) a parking time of the vehicle and / or a temperature difference between fuel in the fuel tank system and a vehicle environment, checking (106) whether at least one of a plurality of diagnostic conditions is satisfied, a first diagnostic condition of the plurality of diagnostic conditions being satisfied if the parking time is longer than a predetermined minimum parking time, and a second diagnostic condition of the plurality of diagnostic conditions being satisfied if the temperature difference is less than a predetermined maximum temperature difference, and (d) if at least one of the plurality of diagnostic conditions is met, performing the following steps: (d1) shutting off (108) the fuel tank system, (d2) waiting (110) until a predetermined waiting time has elapsed, (d3) evacuating (112) the fuel tank system, (d4) recording (114) a time change of pressure in the fuel tank system, (d5) recording (114) a time change of pressure in the fuel tank system, and (d6) recording (114) a time change of pressure in the fuel tank system. And (d5) determining (116) the size of a leak in the fuel tank system based on the recorded time variation of the pressure. The invention also relates to an engine control device and a computer program.

Description

technical field [0001] The present invention relates to the technical field of vehicle diagnostics. In particular, the present invention relates to a method and apparatus for sizing a leak in a fuel tank system of a vehicle with an internal combustion engine. The invention also relates to an engine control device and a computer program. Background technique [0002] Many different methods are known for detecting leaks in fuel tanks, such as the NVLD method (NVLD=Natural Vacuum Leakage Detection) and the LDV method (LDV=LeakageDetection by Vacuum) . [0003] In the case of the NVLD method, the entire system is shut off on the fresh air supply side by means of a spring-loaded non-return valve. The non-return valve is designed by means of a diaphragm so that the valve opens autonomously at a minimum overpressure in the tank (>1-2hPa relative to the environment), while the valve opens only at a differential pressure exceeding 10hPa at negative pressure . Furthermore, not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02G01M3/32F02D41/22
CPCG01M3/025G01M3/3272F02D33/003F02D41/22F02D2041/225F02D2200/0602F02D2200/0606
Inventor 张宏G·哈夫特
Owner VTESCO TECH GMBH
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