A differential pressure pipeline system for an automotive particulate filter

Abstract

The present invention relates to a differential pressure pipeline system for an automotive particulate filter, which comprises a particulate filter body assembly, an upstream differential pressure steel pipe, an upstream heat-resistant hose, a differential pressure sensor, a downstream heat-resistant hose and a downstream differential pressure steel pipe; an upstream concave fold is provided on the upstream differential pressure steel pipe, and a downstream concave fold is provided on the downstream differential pressure steel pipe; a first auxiliary ventilation pipe is communicated with the upstream differential pressure steel pipe at both ends of the upstream concave fold, and a second auxiliary ventilation pipe is communicated with the downstream differential pressure steel pipe at both ends of the downstream concave fold. The technical solution of the present invention has a simple structure, can meet more restrictive requirements for the vehicle layout of the particulate filter and the differential pressure sensor, and can ensure that the differential pressure sensor can always correctly and accurately measure the exhaust gas pressures upstream and downstream of the particulate filter during the normal use of the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, specifically to the technical field of fuel vehicles, and particularly refers to a differential pressure pipeline system for an automotive particulate filter. Background Art

[0002] The power of a fuel vehicle comes from the mechanical energy converted from the heat energy generated by the engine burning gasoline or diesel. When the engine burns gasoline or diesel, the exhaust gas contains substances such as carbon monoxide, nitrogen oxides, hydrocarbons, and particulate matter. If directly discharged into the air, it will pollute the air and cause harm to human health.

[0003] An automotive particulate filter is a device that captures and stores particulate pollutants discharged from an automotive engine combustion. The captured particulate matter is mainly carbon particles. When the particulate matter stored in the particulate filter reaches a certain level, the particulate filter will have a greater impact on the back pressure of the engine exhaust system, affecting the normal performance of the engine. At this time, it is necessary to timely inform the engine control system of the total amount of particulate matter stored in the particulate filter. The engine control system will increase the exhaust temperature, etc., so as to burn the carbon particles stored in the particulate filter through special working conditions, reduce the total amount of particulate matter stored in the particulate filter, and reduce the back pressure of the particulate filter.

[0004] The total amount of particulate matter stored in the automotive particulate filter in a timely manner is calculated by calibrating the relationship between the exhaust pressure difference at the front and rear ends of the particulate filter and the particulate matter weight, and timely collecting the exhaust pressure difference upstream and downstream of the particulate filter.

[0005] As Figure 1 、 Figure 2 shown, the existing differential pressure pipeline system for an automotive particulate filter consists of a particulate filter body assembly 01, an upstream differential pressure steel pipe 02, a steel pipe support assembly 03, an upstream heat-resistant hose 04, a differential pressure sensor 05, a downstream heat-resistant hose 06, a downstream differential pressure steel pipe 07, etc.

[0006] As Figure 3 shown, the upstream differential pressure steel pipe 02 of the existing differential pressure pipeline system for an automotive particulate filter consists of an air intake port 021, a ventilation pipe 022, a hose interface 024, etc. Among them, after the upstream differential pressure steel pipe 02 is installed on the whole vehicle, the concave point 025 is the concave point in the middle section of the ventilation pipe 022.

[0007] As Figure 4 shown, the downstream differential pressure steel pipe 07 of the existing differential pressure pipeline system for an automotive particulate filter consists of an air intake port 071, a ventilation pipe 072, a hose interface 074, etc. Among them, after the downstream differential pressure steel pipe 07 is installed on the whole vehicle, the concave point 075 is the concave point in the middle section of the ventilation pipe 072.

[0008] The rear view of the existing differential pressure pipeline system of the vehicle particulate filter installed on the vehicle is as follows Figure 2 shown. Due to the limitation of the overall vehicle layout space, the vertical height difference between the particulate filter body assembly 01 and the differential pressure sensor 05 is relatively small.

[0009] During the operation of the vehicle, a large amount of water vapor is generated by the engine combustion and discharged into the atmosphere through the exhaust system including the particulate filter. The density of water vapor is relatively small compared to other components in the exhaust gas. Taking the upstream differential pressure steel pipe 02 as an example, the water vapor in the engine exhaust gas will slowly flow into the ventilation pipe 022 from the air intake 021 as the vehicle continues to run, then flow into the upstream heat-resistant hose 04 from the hose interface 024, and accumulate at the inner end of the upstream heat-resistant hose 04. The upstream heat-resistant hose 04 is far from the particulate filter body assembly 01, and the air temperature around the upstream heat-resistant hose 04 is relatively low. The water vapor accumulated in the upstream heat-resistant hose 04 will gradually cool and condense into water droplets, which will flow down along the inner wall of the upstream heat-resistant hose 04 under the action of gravity, flow into the ventilation pipe 022 through the hose interface 024, and gather at the concave point 025. When the vehicle continues to run, the concave point 025 is heated by the particulate filter body assembly 01, and the surface temperature at the concave point 025 is generally higher than 100 °C. The water droplets gathered at the concave point 025 are heated and vaporized again, and then flow back into the upstream heat-resistant hose 04. The water vapor accumulated in the upstream heat-resistant hose 04 will gradually cool and condense into water droplets, and the water droplets will gather at the concave point 025, and so on.

[0010] When the vehicle stops after running for a period of time, the surface temperature at the concave point 025 gradually drops to the ambient temperature, and the water droplets gathered at the concave point 025 will no longer vaporize and will gather at the concave point 025. When the gathered water droplets are enough, they will block the ventilation pipe 022. When the ambient temperature is above 0 °C, the gas pressure at the air intake 021 needs to overcome the gravity of the water gathered at the concave point 025 to be transmitted to the hose interface 024. When the engine is started again, the differential pressure sensor cannot accurately measure the exhaust gas pressure upstream of the particulate filter. When the ambient temperature is below 0 °C, the water blocking the ventilation pipe 022 will freeze into ice, and this ice block prevents the gas pressure at the air intake 021 from being transmitted to the hose interface 024. When the engine is started again, the differential pressure sensor cannot correctly measure the exhaust gas pressure upstream of the particulate filter, and the engine control system will report an error, resulting in abnormal operation of the engine.

[0011] Similarly, the downstream differential pressure steel pipe 07 also has similar problems. Summary of the Invention

[0012] The purpose of the present invention is to provide a differential pressure pipeline system for a vehicle particulate filter, which can meet the layout limitation requirements of a relatively small vertical height difference between the particulate filter body assembly and the differential pressure sensor, so as to solve the problems mentioned in the above background technology.

[0013] To achieve the above object, the present application is implemented through the following technical solutions:

[0014] A differential pressure pipeline system for an automotive particulate filter, comprising a particulate filter body assembly, an upstream differential pressure steel pipe, an upstream heat-resistant hose, a differential pressure sensor, a downstream heat-resistant hose, and a downstream differential pressure steel pipe;

[0015] The upstream differential pressure steel pipe and the downstream differential pressure steel pipe are respectively communicated with the upstream side and the downstream side of the particulate filter body assembly; the upstream heat-resistant hose is respectively connected to the upstream differential pressure steel pipe and the differential pressure sensor; the downstream heat-resistant hose is respectively connected to the downstream differential pressure steel pipe and the differential pressure sensor;

[0016] An upstream concave fold is provided on the upstream differential pressure steel pipe, and a downstream concave fold is provided on the downstream differential pressure steel pipe;

[0017] A first auxiliary ventilation pipe is communicated with the upstream differential pressure steel pipe at both ends of the upstream concave fold, and a second auxiliary ventilation pipe is communicated with the downstream differential pressure steel pipe at both ends of the downstream concave fold.

[0018] Further, the upstream differential pressure steel pipe is composed of an upstream air intake port, an upstream first differential pressure steel pipe, an upstream concave fold, an upstream second differential pressure steel pipe, and an upstream hose interface. The upstream first differential pressure steel pipe is respectively connected to the upstream air intake port and the downstream concave fold, and the upstream second differential pressure steel pipe is respectively connected to the upstream concave fold and the upstream hose interface.

[0019] Further, the downstream differential pressure steel pipe is composed of a downstream air intake port, a downstream first differential pressure steel pipe, a downstream concave fold, a downstream second differential pressure steel pipe, and a downstream hose interface. The downstream first differential pressure steel pipe is respectively connected to the downstream air intake port and the downstream concave fold, and the downstream second differential pressure steel pipe is respectively connected to the downstream concave fold and the downstream hose interface.

[0020] Further, the length of the upstream first differential pressure steel pipe is less than the length of the upstream second differential pressure steel pipe.

[0021] Further, the length of the downstream first differential pressure steel pipe is less than the length of the downstream second differential pressure steel pipe.

[0022] Further, the lowest height of the first auxiliary ventilation pipe is higher than the highest height of the upstream concave fold; the lowest height of the second auxiliary ventilation pipe is higher than the highest height of the downstream concave fold.

[0023] Further, after the upstream differential pressure steel pipe is installed on the whole vehicle, the upstream concave fold is the only concave point on the upstream differential pressure steel pipe; after the downstream differential pressure steel pipe is installed on the whole vehicle, the downstream concave fold is the only concave point on the downstream differential pressure steel pipe.

[0024] Further, it further includes a steel pipe support assembly, and both the upstream differential pressure steel pipe and the downstream differential pressure steel pipe are connected to the vehicle body through the steel pipe support assembly.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The technical solution of the present invention has a simple structure and can meet more restrictive requirements for the vehicle layout of the particulate filter and the differential pressure sensor. During the normal use of the vehicle, it can ensure that the differential pressure sensor can always correctly and accurately measure the exhaust pressures upstream and downstream of the particulate filter. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the existing vehicle particulate filter.

[0028] Figure 2 It is a rear view of the existing vehicle particulate filter after installation.

[0029] Figure 3 It is a schematic structural diagram of the existing upstream differential pressure steel pipe.

[0030] Figure 4 It is a schematic structural diagram of the existing downstream differential pressure steel pipe.

[0031] Figure 5 It is a schematic structural diagram of the vehicle particulate filter of the present invention.

[0032] Figure 6 It is a rear view of the vehicle particulate filter of the present invention after installation.

[0033] Figure 7 It is a schematic structural diagram of the upstream differential pressure steel pipe of the present invention.

[0034] Figure 8 It is a schematic structural diagram of the downstream differential pressure steel pipe of the present invention.

[0035] Description of the Reference Numerals

[0036] 01—Particulate filter body assembly; 02—Upstream differential pressure steel pipe; 03—Steel pipe support assembly; 04—Upstream heat-resistant hose; 05—Differential pressure sensor; 06—Downstream heat-resistant hose; 07—Downstream differential pressure steel pipe; 021—Air intake port; 022—Vent pipe; 024—Hose interface; 025—Dimple; 071—Air intake port; 072—Vent pipe; 074—Hose interface; 075—Dimple; 1—Particulate filter body assembly; 2—First auxiliary vent pipe; 3—Steel pipe support assembly; 4—Upstream heat-resistant hose; 5—Differential pressure sensor; 6—Downstream heat-resistant hose; 7—Second auxiliary vent pipe; 8—Upstream differential pressure steel pipe; 9—Downstream differential pressure steel pipe; 81—Upstream air intake port; 82—Upstream first differential pressure steel pipe; 84—Upstream hose interface; 85—Upstream concave fold; 86—Upstream second differential pressure steel pipe; 91—Downstream air intake port; 92—Downstream first differential pressure steel pipe; 94—Downstream hose interface; 95—Downstream concave fold; 96—Downstream second differential pressure steel pipe. Detailed Embodiments

[0037] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, rather than being construed as a limitation to the technical solution of the present invention.

[0038] As Figure 5 、 Figure 6 shown, the differential pressure pipeline system of the automotive particulate filter of the present invention is composed of a particulate filter body assembly 1, an upstream differential pressure steel pipe 8, a steel pipe support assembly 3, an upstream heat-resistant hose 4, a differential pressure sensor 5, a downstream heat-resistant hose 6, a downstream differential pressure steel pipe 9, etc.

[0039] The upstream differential pressure steel pipe and the downstream differential pressure steel pipe are respectively connected to the upstream side and the downstream side of the particulate filter body assembly; the upstream heat-resistant hose is respectively connected to the upstream differential pressure steel pipe and the differential pressure sensor; the downstream heat-resistant hose is respectively connected to the downstream differential pressure steel pipe and the differential pressure sensor.

[0040] An upstream concave fold is provided on the upstream differential pressure steel pipe, and a downstream concave fold is provided on the downstream differential pressure steel pipe.

[0041] Both the upstream differential pressure steel pipe and the downstream differential pressure steel pipe are connected to the vehicle body through the steel pipe support assembly.

[0042] As Figure 7 shown, the upstream differential pressure steel pipe is composed of an upstream air intake port, an upstream first differential pressure steel pipe, an upstream concave fold, an upstream second differential pressure steel pipe and an upstream hose interface. The upstream first differential pressure steel pipe is respectively connected to the upstream air intake port and the downstream concave fold, and the upstream second differential pressure steel pipe is respectively connected to the upstream concave fold and the upstream hose interface. The length of the upstream first differential pressure steel pipe is less than the length of the upstream second differential pressure steel pipe.

[0043] A first auxiliary ventilation pipe is communicated with the upstream differential pressure steel pipe at both ends of the upstream concave fold. Specifically, the first auxiliary ventilation pipe is respectively connected to the upstream first differential pressure steel pipe and the upstream second differential pressure steel pipe, and the lowest height of the first auxiliary ventilation pipe is higher than the highest height of the upstream concave fold; after the upstream differential pressure steel pipe is installed on the whole vehicle, the upstream concave fold is the only concave point on the upstream differential pressure steel pipe.

[0044] As Figure 8 shown, the downstream differential pressure steel pipe is composed of a downstream air intake port, a downstream first differential pressure steel pipe, a downstream concave fold, a downstream second differential pressure steel pipe and a downstream hose interface. The downstream first differential pressure steel pipe is respectively connected to the downstream air intake port and the downstream concave fold, and the downstream second differential pressure steel pipe is respectively connected to the downstream concave fold and the downstream hose interface; the length of the downstream first differential pressure steel pipe is less than the length of the downstream second differential pressure steel pipe.

[0045] A second auxiliary ventilation pipe is connected to the downstream pressure difference steel pipes at both ends of the downstream concave fold. Specifically, the second auxiliary ventilation pipe is respectively connected to the downstream first pressure difference steel pipe and the downstream second pressure difference steel pipe. The lowest height of the second auxiliary ventilation pipe is higher than the highest height of the downstream concave fold. After the downstream pressure difference steel pipes are installed on the whole vehicle, the downstream concave fold is the only concave point on the downstream pressure difference steel pipes.

[0046] The rear view of the pressure difference pipeline system of the vehicle particulate filter of the present invention installed on a vehicle is as Figure 6 shown. The upstream concave fold 85 of the upstream pressure difference steel pipe 8 is the only concave point in the middle section of the upstream pressure difference steel pipe 8, and the distance between the upstream concave fold 85 and the particulate filter body assembly 1 is relatively close. Even when the vehicle continuously operates at the lowest allowable environmental temperature in the design, the surface temperature of the upstream concave fold 85 can reach above 100 degrees Celsius through the heating of the particulate filter body assembly 1. Similarly, the downstream pressure difference steel pipe 9 also has similar design requirements.

[0047] During the operation of the vehicle, a large amount of water vapor is generated by the combustion of the engine and discharged into the atmosphere through the exhaust system including the particulate filter. The density of water vapor is relatively small compared with other components in the exhaust gas. Taking the upstream pressure difference steel pipe 8 as an example, the water vapor in the engine exhaust gas will slowly flow from the upstream air intake 81 into the upstream first pressure difference steel pipe 82 and the first auxiliary ventilation pipe 2 as the vehicle continuously operates, and then flow from the upstream second pressure difference steel pipe 86 into the upstream hose interface 84 until it reaches the upstream heat-resistant hose 4, and accumulates at the inner end of the upstream heat-resistant hose 4. The upstream heat-resistant hose 4 is far from the particulate filter body assembly 1, and the air temperature around the upstream heat-resistant hose 4 is relatively low. The water vapor accumulated in the upstream heat-resistant hose 4 will gradually cool and condense into water droplets. Under the action of gravity, the water droplets flow down along the inner wall of the upstream heat-resistant hose 4, then flow into the upstream second pressure difference steel pipe 86, and gather towards the upstream concave fold 85. When the vehicle continuously operates, the surface temperature at the upstream concave fold 85 is higher than 100 °C, and the water droplets gathered towards the upstream concave fold 85 are heated and vaporized again, then flow towards the upstream heat-resistant hose 4, condense into water droplets in the upstream heat-resistant hose 4, and then gather towards the upstream concave fold 85, repeating like this.

[0048] When the vehicle stops after running for a period of time, the surface temperature at the upstream concave bend 85 gradually decreases to the ambient temperature. The water droplets accumulating at the upstream concave bend 85 no longer vaporize and will accumulate at the upstream concave bend 85. When enough water droplets have accumulated, the upstream first differential pressure steel pipe 82 will be blocked, but the first auxiliary ventilation pipe 2 always remains unobstructed. When the ambient temperature is above 0°C, the gas pressure at the upstream air intake 81 can be smoothly transmitted through the first auxiliary ventilation pipe 2 to the upstream hose interface 84. When the engine is started again, it can ensure that the differential pressure sensor accurately measures the exhaust gas pressure upstream of the particulate filter. When the ambient temperature is below 0°C, the water blocking the upstream first differential pressure steel pipe 82 will freeze into ice, and the gas pressure at the upstream air intake 81 can also be smoothly transmitted through the first auxiliary ventilation pipe 2 to the upstream hose interface 84. When the engine is started again, it can also ensure that the differential pressure sensor correctly and accurately measures the exhaust gas pressure upstream of the particulate filter. When the vehicle runs continuously for a period of time, the surface temperature at the upstream concave bend 85 is higher than 100°C, and the water droplets or ice cubes inside the upstream concave bend 85 gradually vaporize, and the upstream first differential pressure steel pipe 82 resumes unobstructed flow.

[0049] During the repeated use process of the vehicle running and stopping, the water droplets accumulating at the upstream concave bend 85 will not increase sequentially, thereby ensuring that the first auxiliary ventilation pipe 2 can always remain unobstructed.

[0050] Similarly, when the vehicle stops after running for a period of time, the downstream differential pressure steel pipe 9 can also smoothly transmit the gas pressure at the downstream air intake 91 to the downstream hose interface 94, ensuring that the differential pressure sensor can also correctly and accurately measure the exhaust gas pressure downstream of the particulate filter. During the repeated use process of the vehicle running and stopping, it can also ensure that the second auxiliary ventilation pipe 7 always remains unobstructed.

[0051] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A differential pressure pipeline system for an automotive particulate filter, comprising a particulate filter body assembly, an upstream differential pressure steel pipe, an upstream heat-resistant hose, a differential pressure sensor, a downstream heat-resistant hose, and a downstream differential pressure steel pipe; The upstream differential pressure steel pipe and the downstream differential pressure steel pipe are respectively communicated with the upstream side and the downstream side of the particulate filter body assembly; the upstream heat-resistant hose is respectively connected to the upstream differential pressure steel pipe and the differential pressure sensor; the downstream heat-resistant hose is respectively connected to the downstream differential pressure steel pipe and the differential pressure sensor; It is characterized in that An upstream concave fold is provided on the upstream differential pressure steel pipe, and a downstream concave fold is provided on the downstream differential pressure steel pipe; A first auxiliary ventilation pipe is communicated with the upstream differential pressure steel pipe at both ends of the upstream concave fold, and a second auxiliary ventilation pipe is communicated with the downstream differential pressure steel pipe at both ends of the downstream concave fold; The length of the downstream first differential pressure steel pipe is less than the length of the downstream second differential pressure steel pipe; The lowest height of the first auxiliary ventilation pipe is higher than the highest height of the upstream concave fold; the lowest height of the second auxiliary ventilation pipe is higher than the highest height of the downstream concave fold.

2. The differential pressure pipeline system for an automotive particulate filter according to claim 1, It is characterized in that The upstream differential pressure steel pipe is composed of an upstream air intake port, an upstream first differential pressure steel pipe, an upstream concave fold, an upstream second differential pressure steel pipe, and an upstream hose interface. The upstream first differential pressure steel pipe is respectively connected to the upstream air intake port and the downstream concave fold, and the upstream second differential pressure steel pipe is respectively connected to the upstream concave fold and the upstream hose interface.

3. The differential pressure pipeline system for an automotive particulate filter according to claim 2, It is characterized in that The length of the upstream first differential pressure steel pipe is less than the length of the upstream second differential pressure steel pipe.

4. The differential pressure pipeline system for an automotive particulate filter according to claim 1, It is characterized in that The downstream differential pressure steel pipe is composed of a downstream air intake port, a downstream first differential pressure steel pipe, a downstream concave fold, a downstream second differential pressure steel pipe, and a downstream hose interface. The downstream first differential pressure steel pipe is respectively connected to the downstream air intake port and the downstream concave fold, and the downstream second differential pressure steel pipe is respectively connected to the downstream concave fold and the downstream hose interface.

5. The differential pressure pipeline system for an automotive particulate filter according to claim 1, It is characterized in that After the upstream differential pressure steel pipe is installed on the whole vehicle, the upstream concave fold is the only concave point on the upstream differential pressure steel pipe; after the downstream differential pressure steel pipe is installed on the whole vehicle, the downstream concave fold is the only concave point on the downstream differential pressure steel pipe.

6. The differential pressure pipeline system for an automotive particulate filter according to claim 1, It is characterized in that It further includes a steel pipe support assembly, and both the upstream differential pressure steel pipe and the downstream differential pressure steel pipe are connected to the vehicle body through the steel pipe support assembly.

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