CN216665782U - System for detecting air permeability of automobile fuel evaporation system and automobile - Google Patents

Abstract

The utility model relates to a system for detecting the air permeability of an automobile fuel evaporation system and an automobile, wherein the system comprises a carbon tank and an oil tank which are communicated through a carbon tank and oil tank connecting pipe, a pressure sensor is arranged on the carbon tank and oil tank connecting pipe, used for detecting the vacuum degree of the oil tank, and also comprises an electronic control unit, a control valve and an alarm unit, the control valve is opened to desorb the carbon tank and closed to stop desorbing, the control valve and the pressure sensor are both electrically connected with the electronic control unit, when the pressure sensor detects that the vacuum degree of the oil tank is greater than a second preset value, the electronic control unit controls the control valve to close, when the pressure sensor detects that the vacuum degree in the oil tank is greater than a first preset value and less than or equal to a second preset value, and when the duration time of the state reaches T, the electronic control unit controls the alarm unit to start. The utility model effectively protects the safety of the oil tank and avoids safety accidents caused by the fact that the oil tank is shriveled.

Description

System for detecting air permeability of automobile fuel evaporation system and automobile

Technical Field

The utility model relates to the technical field of automobile engines, in particular to an automobile fuel evaporation technology.

Background

In order to meet the requirements of national six regulations that the fuel evaporation system is not allowed to have leakage exceeding 1mm and stricter evaporative emission, the scheme of the fuel evaporation system parts is optimized and upgraded, as shown in figures 1 and 2, firstly, an air supplementing one-way valve 1 of the oil filler cover is cancelled relative to national five, and secondly, a ventilation stop valve and an ash filter are added at an air passing end of a carbon tank.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a system for detecting the air permeability of an automobile fuel evaporation system, which aims to solve the problems of oil tank deflation caused by blockage of an ash filter, normally closed clamping of a stop valve and blockage of a carbon tank; the second purpose provides an automobile.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

a system for detecting the air permeability of an automobile fuel evaporation system comprises a carbon tank and an oil tank which are communicated through a carbon tank and oil tank connecting pipe, wherein a pressure sensor is arranged on the carbon tank and oil tank connecting pipe, used for detecting the vacuum degree of the oil tank, and also comprises an electronic control unit, a control valve and an alarm unit, the control valve is opened to desorb the carbon tank, and closed to stop desorbing, the control valve and the pressure sensor are electrically connected with the electronic control unit, when the pressure sensor detects that the vacuum degree of the oil tank is greater than a second preset value, the electronic control unit controls the control valve to close, when the pressure sensor detects that the vacuum degree in the oil tank is greater than a first preset value and less than or equal to a second preset value, and when the duration time of the state reaches T, the electronic control unit controls the alarm unit to start.

By adopting the technical means, when the pressure sensor detects that the vacuum degree of the oil tank is greater than the second preset value, the blockage of the ash filter, the blocking of the stop valve and the normal close or the blockage of the carbon tank are serious, the external atmospheric pressure is obviously higher than the pressure in the oil tank, and the control valve is closed immediately at the moment, so that the result that the oil tank is shriveled due to the continuous desorption of the gas in the oil tank is avoided; when the pressure sensor detects that the vacuum degree in the oil tank is greater than a first preset value and less than or equal to a second preset value, the blockage is indicated, and an alarm unit is started to prompt a driver to overhaul.

Further, still include the stop valve, the export of stop valve with the carbon tank intercommunication, the import and the ash filter of stop valve are linked together, the ash filter is linked together with the outside.

Further, the electronic control unit is also electrically connected with the stop valve and the engine.

Further, be equipped with the control valve between engine and the carbon tank, engine, control valve and carbon tank communicate in proper order, the control valve with the electronic control unit electricity is connected.

Further, the alarm unit is a fault indicator lamp.

An automobile comprises an automobile body, wherein the automobile body is integrated with the system for detecting the air permeability of the automobile fuel evaporation system.

The utility model has the beneficial effects that:

the utility model can detect the ventilation of the evaporation system and remind a user of maintenance, and meanwhile, when the evaporation system is blocked, the oil tank needs to be protected to avoid the damage of the oil tank caused by the shriveled oil tank, so that the safety of the oil tank is effectively protected, and the safety accident caused by the shriveled oil tank is avoided.

Drawings

FIG. 1 is a schematic view of a filler cap structure according to the fifth national regulation;

FIG. 2 is a schematic view of the structure of a fuel filler cap in accordance with the national six regulations;

FIG. 3 is a schematic view of a ventilation detection system for an automotive fuel evaporation system of the present invention, wherein the solid lines represent tubing and the dashed lines represent wiring harnesses;

FIG. 4 is a schematic view of an exemplary venting detection system for a fuel evaporation system of an automobile according to the present invention;

FIG. 5 is a flow chart of a method for detecting the ventilation of an automotive fuel evaporation system;

FIG. 6 is a schematic diagram of the method for detecting the ventilation of the fuel evaporation system of the automobile according to the present invention.

The system comprises a check valve 1, a control valve 2, a control valve outlet pipe 3, a control valve 4, a control valve inlet pipe 5, a carbon tank 6, a carbon tank oil tank connecting pipe 6, a pressure sensor 7, an oil tank 8, an oil filling pipe 9, an oil filler cap 10, a stop valve outlet pipe 11, a stop valve 12, a stop valve inlet pipe 13, a dust filter 14, an electronic control unit 15 and an engine 16.

Detailed Description

Other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein, wherein embodiments of the present invention are described below with reference to the accompanying drawings and preferred embodiments. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the utility model only and are not limiting upon the scope of the utility model.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, amount and proportion of each component in actual implementation can be changed freely, and the layout of the components can be more complicated.

This embodiment has provided a system for detecting car fuel evaporation system air permeability, as shown in fig. 3 and fig. 4, including carbon tank 5 and oil tank 8, realize the intercommunication through carbon tank oil tank connecting pipe 6 between carbon tank 5 and the oil tank 8, the one end and the carbon tank 5 intercommunication of carbon tank oil tank connecting pipe 6 promptly, the other end and oil tank 8 intercommunication, install pressure sensor 7 on the carbon tank oil tank connecting pipe 6, pressure sensor 7 is used for the vacuum in the real-time detection oil tank 8, oil tank 8 and oil pipe 9 intercommunication, and oil tank 8 is through adding oil pipe 9 and outside intercommunication, the tip swing joint who adds oil pipe 9 has filler cap 10.

The carbon tank 5 is communicated with the stop valve 12 through the stop valve air outlet pipe 11, the stop valve 12 is communicated with the ash filter 14 through the stop valve air inlet pipe 13, and the ash filter 14 is communicated with the outside and can be communicated with the air.

Still include engine 16 and control valve 3, engine 16, control valve 3, carbon tank 5 and oil tank 8 communicate in proper order, and wherein, be linked together through control valve outlet duct 2 between engine 16 and the control valve 3, be linked together through control valve intake pipe 4 between control valve 3 and the carbon tank 5, then carry out the desorption of carbon tank 5 when control valve 3 opens, stop the desorption when closing.

The fuel evaporation system further comprises an electronic control unit 15, the electronic control unit 15 is a controller, the electronic control unit 15 is connected with the engine 16, the control valve 3, the pressure sensor 7 and the stop valve 12 through a wire harness to transmit signals and control, the signals are fed back through the control valve 3 and the pressure sensor 7 to be used for internal calculation and diagnosis, whether the air permeability of the fuel evaporation system is intact or not is finally judged, if the air permeability is blocked, a fault is reported, and the fault indicator light is used for prompting maintenance. If the desorption is continued after the blockage and the negative pressure continues to increase to another preset threshold value, the control valve 3 is immediately closed, and the desorption is stopped to avoid the situation that the oil tank 8 is deflated due to the continuous desorption.

In this embodiment, the method for detecting the air permeability of the automobile fuel evaporation system is implemented by controlling, detecting and judging by using the existing evaporation system part scheme, and specifically includes: as shown in fig. 5, the engine 16 is started and operated, the electronic control unit 15 controls the control valve 3 and the stop valve 12 to open, so as to desorb the oil vapor in the fuel evaporation system, after a certain time, the pressure in the fuel tank 8 is detected by the pressure sensor 7, when the detected vacuum degree P in the fuel tank 8 is greater than a first preset value P1 and less than or equal to a second preset value P2 and lasts for T time, the blockage is considered to exist, and after the fault is confirmed, a fault lamp is turned on to remind a user of maintenance, otherwise, the normal operation is realized. If the desorption is continued after the blockage, and the vacuum degree P is continuously increased to the second preset value P2, the control valve 3 is immediately closed, so that the desorption is stopped to avoid the situation that the continuous desorption causes the fuel tank 8 to be deflated.

P, P1 and P2 in the embodiment can be selected according to actual conditions.

In this embodiment, the fault lamp as the alarm unit may also be an alarm, that is, when the vacuum degree P in the oil tank 8 is greater than the first preset value P1 and less than or equal to the second preset value P2 and lasts for T time, it is determined that there is a jam, and the electronic control unit 15 starts an alarm to warn the driver.

As shown in fig. 6, in this embodiment, when the vacuum level of the fuel tank 8 is greater than the second preset value P2, the control valve 3 is immediately closed, the vacuum level of the fuel system is significantly reduced, and the risk of the fuel tank 8 being deflated is effectively reduced.

The embodiment also provides an automobile, which comprises an automobile body, wherein the automobile body is integrated with the system for detecting the air permeability of the automobile fuel evaporation system.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the utility model is all within the protection scope of the utility model.

Claims (7)

1. The utility model provides a detect system of car fuel evaporation system air permeability, includes carbon tank (5) and oil tank (8), and both are linked together its characterized in that through carbon tank oil tank connecting pipe: the carbon tank and oil tank connecting pipe is provided with a pressure sensor (7) for detecting the vacuum degree of the oil tank (8), and also comprises an electronic control unit (15), a control valve (3) and an alarm unit, the carbon tank (5) is desorbed when the control valve (3) is opened, the carbon tank (5) stops desorbing when the control valve is closed, the control valve (3) and the pressure sensor (7) are both electrically connected with the electronic control unit (15), when the pressure sensor (7) detects that the vacuum degree of the oil tank (8) is greater than a second preset value, the electronic control unit (15) controls the control valve (3) to close, when the pressure sensor (7) detects that the vacuum degree in the oil tank (8) is greater than a first preset value and less than or equal to a second preset value, and when the duration time of the state reaches T, the electronic control unit (15) controls the alarm unit to start.

2. The system for detecting the ventilation of an automobile fuel evaporation system according to claim 1, wherein: still include stop valve (12), the export of stop valve (12) with carbon tank (5) intercommunication, the import and the ash filter (14) of stop valve (12) are linked together, ash filter (14) are linked together with the outside.

3. The system for detecting the ventilation of an automobile fuel evaporation system according to claim 2, wherein: the electronic control unit (15) is also electrically connected with the stop valve (12) and an engine (16).

4. A system for detecting the ventilation of an automotive fuel evaporation system as claimed in claim 3, wherein: an oil filling pipe (9) is connected to the oil tank (8), so that the oil tank (8) can be communicated with the outside through the oil filling pipe (9).

5. A system for detecting the ventilation of an automotive fuel evaporation system as claimed in claim 3, wherein: be equipped with control valve (3) between engine (16) and carbon tank (5), engine (16), control valve (3) and carbon tank (5) communicate in proper order, control valve (3) with electronic control unit (15) electricity is connected.

6. The system for detecting the ventilation of an automobile fuel evaporation system according to claim 1, wherein: the alarm unit is a fault indicator lamp.

7. An automobile, comprising a body, characterized in that: the vehicle body is integrated with a system for detecting the ventilation of a fuel evaporation system of an automobile according to any one of claims 1 to 6.

Images