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Diagnostic device for vehicle fuel evaporation leakage and diagnostic method thereof

A diagnostic device and fuel technology, applied to combustion engines, internal combustion piston engines, charging systems, etc., can solve problems such as fuel leakage in dual-fuel fuel vehicles, fuel diagnostic devices cannot be applied, etc., and achieve the effect of ensuring the quality of air extraction

Active Publication Date: 2019-01-01
HUNAN GEELY AUTOMOBILE COMPONENTS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the automobile fuel diagnostic device in the prior art cannot be applied to the automobile operated by the turbocharged engine, and the problem that the fuel leakage cannot be diagnosed for the dual-fuel fuel automobile

Method used

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  • Diagnostic device for vehicle fuel evaporation leakage and diagnostic method thereof
  • Diagnostic device for vehicle fuel evaporation leakage and diagnostic method thereof
  • Diagnostic device for vehicle fuel evaporation leakage and diagnostic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In order to solve the problems existing in the prior art, the present invention discloses a vehicle fuel evaporation leakage diagnosis device, such as figure 1 As shown, the vehicle fuel evaporation leakage diagnosis device includes an air extraction management system 1 and a fuel evaporation leakage diagnosis system 2, and the air extraction management system 1 includes a gas circulation valve 11, a first branch pipeline 13, a second branch pipeline 14. Venturi valve 12 and turbocharged engine 17,

[0038] The gas circulation valve 11 includes an inlet port, a first outlet port and a second outlet port, and the turbocharged engine 17 includes an air filter 171, a turbocharger 172, an air intercooler 173, a throttle valve 174 and Intake manifold 175, the inlet end of the gas circulation valve 11 is connected to the fuel evaporation leakage diagnosis system 2, the first outlet end of the gas circulation valve 11 is connected to the first branch pipeline 13, the The othe...

Embodiment 2

[0051] In order to solve the problems in the prior art, the present invention also provides a diagnostic method for vehicle name fuel evaporation leakage, specifically, as figure 2 As shown, the method includes the following steps:

[0052] S10. Close the first lock valve and the canister ventilation valve 31, and open the canister cleaning valve 261;

[0053] S20. Keep one of the first lock valve and the second lock valve 231 locked, and pump air to the fuel vapor leakage diagnosis system 2; in this embodiment, take the first lock valve open and the second lock valve 231 closed as an example , when the working fuel of the engine is methanol, the fuel vapor leakage diagnosis system 2, that is, in this embodiment, realizes that the fuel vapor leakage diagnosis system 2 is composed of the methanol fuel tank 22, the methanol vapor recovery pipeline 24, the carbon tank 25 and the vapor desorption pipeline 26. The Methanol Fuel Leak Diagnostic Module is pumped.

[0054] S30. Aft...

Embodiment 3

[0067] In this implementation, different from Embodiment 2, in step S20, the first lock valve is kept closed and the second lock valve 231 is opened, so that when the working fuel of the engine is gasoline, the fuel vapor leakage diagnosis system 2, That is, the gasoline fuel leakage diagnostic module composed of the gasoline tank 21 , gasoline vapor recovery pipeline 23 , carbon canister 25 and vapor desorption pipeline 26 is pumped. In step S30, the pressure value P is detected by the second pressure sensor, and the fuel temperature value T when the pressure value P is reached is detected by the second temperature sensor. In obtaining t in step S40 1 ,P 1 and T 1 , the test is carried out under the following conditions: the above-mentioned preset pressure value P 1 , preset time t 1 and the preset temperature T 1 It is obtained through a large number of tests. The above values ​​are different for different models and fuels. Specifically, the test can be carried out unde...

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Abstract

The invention relates to the technical field of automotive inspection and discloses a diagnostic device for vehicle fuel evaporation leakage and a diagnostic method thereof. The device comprises a pumping management system and a fuel evaporation leakage diagnostic system. The pumping management system comprises a gas circulation valve, a Venturi valve and a turbocharged engine. The gas circulationvalve is connected with the fuel evaporation leakage diagnostic system through an inlet end of the gas circulation valve, connected in sequence with a first branch pipeline and the Venturi valve through a first outlet end of the gas circulation valve and connected in sequence with a second branch pipeline and the turbocharged engine through a second outlet end of the gas circulation valve respectively. Air pumping is conducted on the fuel evaporation leakage diagnostic system through the first branch pipeline and the second branch pipeline by the pumping management system. The diagnostic method is applicable to automobiles with turbocharged engines and dual-fuel automobiles. According to the diagnostic device for vehicle fuel evaporation leakage, the structure is simple; and the problem that in the prior art, leakage diagnosis of the automobiles with the turbocharged engines and dual-fuel automobiles cannot be achieved is solved.

Description

technical field [0001] The invention relates to the technical field of automobile detection, in particular to a vehicle fuel evaporation leakage diagnosis device and a diagnosis method thereof. Background technique [0002] With the reduction of petroleum energy reserves and the continuous increase of car ownership; human beings are increasingly facing the two major crises of energy depletion and environmental pollution. In order to fundamentally solve the above problems, scientists continue to explore new technologies and adopt new renewable clean fuels Substitute oil, reduce oil usage and vehicle emissions. At the same time, countries around the world have formulated relevant emission regulations to promote continuous improvements in vehicle technology and reduce vehicle emissions. [0003] Although methanol has many advantages as an alternative fuel for vehicles, it has a high ignition point and is difficult to start at low temperature, and methanol filling stations are n...

Claims

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Application Information

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IPC IPC(8): F02M25/08F02M37/00F02D41/22F02D41/00
CPCF02D41/004F02D41/22F02D2041/225F02M25/0836F02M25/0872F02M25/089F02M37/0064Y02T10/40
Inventor 李书福吴勇胜
Owner HUNAN GEELY AUTOMOBILE COMPONENTS
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