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Fuel system of automobile and leakage detection method of fuel system

A technology for fuel systems and automobiles, which is applied in the direction of charging systems, adding non-fuel substances to fuel, and combustion engines, and can solve problems such as false alarms and detection errors

Active Publication Date: 2021-10-22
YAPP AUTOMOTIVE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application provides a fuel system of an automobile and a leak detection method of the fuel system, which fundamentally solves the problems of detection errors and false alarms caused by reference holes by measuring pressure and judging pressure drop

Method used

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  • Fuel system of automobile and leakage detection method of fuel system
  • Fuel system of automobile and leakage detection method of fuel system
  • Fuel system of automobile and leakage detection method of fuel system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Figure 3-8 It is a structural diagram of a detector of an embodiment provided in this application. like image 3 As shown, the detector includes a housing 18, and an exhaust passage is provided in the housing 18. A first cavity 21 is arranged on the exhaust passage, and the air inlet of the first cavity 21 is connected with the gas outlet of the fuel vapor recovery tank 2. The air outlet of the first cavity 21 communicates with the air filter 4 through the second cavity 22 , and further communicates with the atmosphere. The air outlet of the first cavity 21 is provided with a first communication port 29, and the first communication port 29 is provided with a first valve core 31, the first valve core 31 is opened and closed by a locking mechanism 35, and the fuel system is realized when opened. Leakage after normal exhaust and leak detection, used for pumping up and maintaining pressure in the fuel system when shutting down.

[0058] Specifically, in the pumping stag...

Embodiment 2

[0074] Considering that the micro solenoid valve will increase the cost of the entire fuel system and the complexity of the control program, the present application provides a detector of another embodiment based on the above embodiments. Figure 9-13 It is a structural diagram of a detector of another embodiment provided in this application. The difference between this embodiment and the above-mentioned embodiment is: first, the drive mechanism of the second valve core 30 is different. In this embodiment, a rebound mechanism 37 is provided on the side of the second valve core 30 facing the second sub-cavity. , the second valve core 30 is opened by the pressure difference between the first sub-cavity 19 and the second sub-cavity 20 , and the second valve core 30 is closed by the rebound mechanism 37 . The cost is reduced by replacing the micro solenoid valve 27 with the rebound mechanism 37 . Second, the vent hole 32 in the above embodiment is eliminated, and a damping hole 3...

Embodiment 3

[0082] The present application also provides a leakage detection method matched with the above-mentioned fuel system. like Figure 14 As shown, the leakage detection method includes the following steps:

[0083] S1410: In response to receiving the leakage detection signal, control the locking mechanism to switch from the second state to the first state, so that the first valve core is closed.

[0084] S1420: Control the pressure regulator to pump air into the fuel system.

[0085] S1430: In response to the pressure of the fuel system reaching a predetermined pressure, the actuator controlling the pressure regulator stops running, and the fuel system enters a pressure maintaining state.

[0086] S1440: Collect the pressure signal of the fuel system within a preset time.

[0087] S1450: Calculate the difference between the earliest pressure value and the latest pressure value within a preset time as a pressure change detection value.

[0088] Subsequently, it is judged wheth...

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Abstract

The invention discloses a fuel system of an automobile and a leakage detection method of the fuel system. The fuel system comprises a fuel steam recovery tank and a leakage detection device; the leakage detection device comprises a microcontroller, a detector and a pressure regulator; an execution mechanism of the pressure regulator is in signal connection with the microcontroller, and a gas outlet of the pressure regulator is connected with the fuel steam recovery tank; the detector comprises a first cavity and a second cavity, an air outlet of the first cavity is provided with a first communication port, the first communication port is provided with a first valve element, and the first valve element is opened and closed through a locking mechanism; in the inflating and pressure maintaining stage, the locking mechanism is in the first state, and the locking mechanism controls the first valve element to be closed; and in the normal exhaust stage, the locking mechanism is in the second state, and the locking mechanism controls the first valve element to be opened. According to the fuel system of the automobile and the leakage detection method of the fuel system, the problems of detection errors and false alarms caused by a reference hole are fundamentally solved by adopting a mode of measuring pressure and judging pressure drop.

Description

technical field [0001] The present application relates to the technical field of automobiles, and more specifically, relates to a fuel system of an automobile and a method for detecting leakage of the fuel system. Background technique [0002] With the improvement of environmental protection awareness, the emission regulations of traditional fuel vehicles in various countries are becoming more and more stringent, and it has become a mainstream trend for traditional fuel vehicles to have on-board diagnostic systems (OBD). In the prior art, the OBD detection of the fuel system is completed by forming positive or negative pressure in the fuel system to determine whether there is a leak point. [0003] At present, the main leakage detection method is to use the reference hole set on the leakage detection module to determine the current change standard value of the motor or the pressure change standard value of the fuel system, and use the current change value or pressure change ...

Claims

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Application Information

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IPC IPC(8): F02D41/22F02M25/08
CPCF02D41/22F02M25/08F02D2041/225Y02T10/40
Inventor 姜林高德俊吕昊李进苏卫东刘亚洲严济彦周传军张艳波徐哲吴旭东任业荀祥
Owner YAPP AUTOMOTIVE PARTS
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