阅读说明：本技术 一种防止排气管路结冰的方法 (Method for preventing exhaust pipeline from freezing ) 是由 方勇 方娜 秦建宾 王小涛 金磊 于 2021-06-16 设计创作，主要内容包括：本发明公开了一种防止排气管路结冰的方法,包括：获取外界大气的大气温度；当大气温度小于等于预设触发温度时,检测车辆是否处于熄火状态；当车辆处于熄火状态时,打开车辆的节气门、进气门和排气门,开启车辆的气泵装置,通过气泵装置使外界大气流入发动机进排气系统,以置换发动机进排气系统中带有水蒸气的废气,其中,气泵装置设置在发动机进排气系统的排气管路上。本申请通过湿度更低的大气替换发动机进排气系统中的湿度更高的废气,减少发动机进排气系统中的含水量,减少发动机进排气系统中的结冰量,以达到降低排气管路发生堵塞的几率,保证发动机的性能处于较有状态。(The invention discloses a method for preventing an exhaust pipeline from icing, which comprises the following steps: obtaining the atmospheric temperature of the outside atmosphere; when the atmospheric temperature is less than or equal to a preset trigger temperature, detecting whether the vehicle is in a flameout state; when the vehicle is in a flameout state, opening a throttle valve, an intake valve and an exhaust valve of the vehicle, opening an air pump device of the vehicle, and enabling outside atmosphere to flow into an air inlet and exhaust system of the engine through the air pump device so as to replace waste gas with water vapor in the air inlet and exhaust system of the engine, wherein the air pump device is arranged on an exhaust pipeline of the air inlet and exhaust system of the engine. This application replaces the higher waste gas of humidity in the engine advances exhaust system through the lower atmosphere of humidity, reduces the water content that the engine advances exhaust system, reduces the freezing volume that the engine advances exhaust system to reach and reduce the probability that exhaust pipe takes place to block up, guarantee that the performance of engine is in more stateful.)

1. A method of preventing icing of an exhaust line, the method comprising:

obtaining the atmospheric temperature of the outside atmosphere;

when the atmospheric temperature is less than or equal to a preset trigger temperature, detecting whether the vehicle is in a flameout state;

when the vehicle is in a flameout state, opening a throttle valve, an intake valve and an exhaust valve of the vehicle, opening an air pump device of the vehicle, and enabling outside atmosphere to flow into an engine air inlet and exhaust system through the air pump device so as to replace exhaust gas with water vapor in the engine air inlet and exhaust system, wherein the air pump device is arranged on an exhaust pipeline of the engine air inlet and exhaust system.

2. The method of claim 1, wherein after turning on an air pump device of the vehicle, the method further comprises:

detecting whether an interruption triggering event occurs to the vehicle, wherein the interruption triggering event comprises any one or more of the events of gear change of a gearbox, ignition starting, occurrence of an accelerator pedal signal, occurrence of a brake pedal signal, occurrence of a clutch pedal signal and battery voltage lower than a preset voltage value;

if so, closing the air pump device, and resetting the throttle valve, the intake valve and the exhaust valve of the vehicle.

3. The method of claim 1, wherein prior to opening a throttle, intake, and exhaust valve of the vehicle, the method further comprises:

judging whether the duration time of the vehicle in a flameout state exceeds a preset flameout duration time or not;

and if so, opening a throttle valve, an intake valve and an exhaust valve of the vehicle, and opening an air pump device of the vehicle.

4. The method of claim 1, wherein the detecting whether the vehicle is in a key-off state comprises:

detecting whether a gear of a gearbox of the vehicle is in a parking gear to obtain a first detection result, and detecting whether the vehicle generates an accelerator pedal signal, a brake pedal signal and a clutch pedal signal to obtain a second detection result;

and determining whether the vehicle is in the flameout state or not according to the first detection result and the second detection result.

5. The method of claim 1, wherein said opening the intake and exhaust valves of the vehicle comprises:

acquiring the positions of the intake valve and the exhaust valve acquired by a position sensor of the vehicle;

opening the intake valve and the exhaust valve after determining the position of the intake valve and the exhaust valve.

6. The method of claim 1, wherein after turning on an air pump device of the vehicle, the method further comprises:

and when the opening duration of the air pump device reaches the preset exhaust duration, closing the air pump device, and resetting the throttle valve, the intake valve and the exhaust valve of the vehicle.

7. The method of claim 6, wherein prior to turning on the air pump device, the method further comprises:

acquiring the atmospheric humidity of the outside atmosphere, the exhaust gas humidity of the engine air intake and exhaust system, the volume of the engine air intake and exhaust system and the exhaust efficiency of the air pump device;

determining the preset exhaust time period according to the difference between the atmospheric humidity and the exhaust gas humidity, the volume and the exhaust efficiency.

8. The method of claim 7, wherein capturing the ambient atmospheric humidity and the exhaust gas humidity of the engine intake and exhaust system comprises:

acquiring the atmospheric pressure of the outside atmosphere;

according to the atmospheric temperature and the atmospheric pressure, inquiring an air enthalpy-humidity diagram corresponding to the atmospheric pressure, and determining the atmospheric humidity of the external atmosphere;

acquiring the exhaust gas temperature and the exhaust gas pressure of an intake and exhaust system of the engine;

and inquiring an exhaust gas enthalpy-humidity diagram corresponding to the exhaust gas pressure according to the exhaust gas temperature and the exhaust gas pressure, and determining the exhaust gas humidity of the engine intake and exhaust system.

9. The method of claim 1, wherein after turning on the air pump device, the method further comprises:

acquiring real-time exhaust gas humidity of an air inlet and exhaust system of the engine;

and when the real-time exhaust gas humidity is less than or equal to the preset exhaust gas humidity, closing the air pump device, and resetting the throttle valve, the intake valve and the exhaust valve of the vehicle.

10. The method of claim 1, wherein said starting said air pump device to allow ambient atmosphere to flow into said engine intake and exhaust system via said air pump device to displace water vapor-laden exhaust gases in said engine intake and exhaust system comprises:

and opening the air pump device, sucking the outside air from the throttle valve through the air pump device, flowing the sucked outside air into the engine intake and exhaust system, and enabling the exhaust gas with water vapor in the engine intake and exhaust system to flow out from the outlet of the muffler.

Technical Field

The invention relates to the technical field of automobiles, in particular to a method for preventing an exhaust pipeline from freezing.

Background

During the use of the automobile, the exhaust gas generated by the combustion of the fuel contains a large amount of water vapor. During normal driving of the automobile, water vapor is discharged to the outside atmosphere from the exhaust port of the exhaust system along with exhaust gas. When the vehicle is flamed out after running for a period of time, the throttle valve is closed, and at the moment, a large amount of water vapor in the exhaust gas generated by combustion still stays in the exhaust system. When the ambient temperature is low, the temperature of the pipe wall, the exhaust outlet and other parts in the exhaust system contacting the outside atmosphere is rapidly reduced. When the exhaust gas with high temperature and containing a large amount of water vapor is mixed with low-temperature air or the exhaust gas contacts the wall of the low-temperature exhaust pipe, the temperature is gradually lower than the dew point temperature, and the water vapor in the exhaust gas is converted into liquid water. Under the condition that the external atmospheric temperature is lower than the freezing point temperature, liquid water generated after parking gradually freezes in an exhaust system, an ice layer becomes thicker and thicker, and an exhaust pipeline can be blocked when the ice layer is serious, so that the performance of an engine is reduced; and may even completely block the exhaust port, causing the engine to misfire properly.

Disclosure of Invention

The embodiment of the application provides a method for preventing exhaust pipe from freezing, has solved among the prior art under low temperature environment, and exhaust pipe freezes easily, causes the technical problem that exhaust pipe blockked up, has realized reducing the technological effect of the volume of freezing in the exhaust pipe.

The application provides a method for preventing an exhaust pipeline from icing, which comprises the following steps:

obtaining the atmospheric temperature of the outside atmosphere;

when the atmospheric temperature is less than or equal to a preset trigger temperature, detecting whether the vehicle is in a flameout state;

when the vehicle is in a flameout state, opening a throttle valve, an intake valve and an exhaust valve of the vehicle, opening an air pump device of the vehicle, and enabling outside atmosphere to flow into an air inlet and exhaust system of the engine through the air pump device so as to replace waste gas with water vapor in the air inlet and exhaust system of the engine, wherein the air pump device is arranged on an exhaust pipeline of the air inlet and exhaust system of the engine.

Further, after turning on the air pump device of the vehicle, the method further includes:

detecting whether an interrupt trigger event occurs to the vehicle, wherein the interrupt trigger event comprises any one or more events of gear change of a gearbox, ignition starting, generation of an accelerator pedal signal, generation of a brake pedal signal, generation of a clutch pedal signal and battery voltage lower than a preset voltage value;

if so, the air pump device is closed, and the throttle valve, the intake valve and the exhaust valve of the vehicle are reset.

Further, before opening the throttle, intake, and exhaust valves of the vehicle, the method further comprises:

judging whether the duration time of the vehicle in the flameout state exceeds a preset flameout duration time or not;

and if so, opening a throttle valve, an inlet valve and an exhaust valve of the vehicle, and opening an air pump device of the vehicle.

Further, detecting whether the vehicle is in a flameout state includes:

detecting whether a gear of a gearbox of a vehicle is in a parking gear to obtain a first detection result, and detecting whether the vehicle generates an accelerator pedal signal, a brake pedal signal and a clutch pedal signal to obtain a second detection result;

and determining whether the vehicle is in a flameout state or not according to the first detection result and the second detection result.

Further, opening intake and exhaust valves of a vehicle includes:

acquiring positions of an intake valve and an exhaust valve acquired by a position sensor of a vehicle;

after the position of the intake and exhaust valves is determined, the intake and exhaust valves are opened.

Further, after turning on the air pump device of the vehicle, the method further includes:

and when the opening duration of the air pump device reaches the preset exhaust duration, closing the air pump device and resetting a throttle valve, an intake valve and an exhaust valve of the vehicle.

Further, before turning on the air pump device, the method further comprises:

acquiring the atmospheric humidity of the outside atmosphere, the exhaust gas humidity of an engine air inlet and exhaust system, the volume of the engine air inlet and exhaust system and the exhaust efficiency of an air pump device;

the preset exhaust time is determined according to the difference amount between the atmospheric humidity and the exhaust gas humidity, the volume and the exhaust efficiency.

Further, acquiring the atmospheric humidity of the outside atmosphere and the exhaust gas humidity of an air inlet and exhaust system of the engine, comprises:

acquiring the atmospheric pressure of the outside atmosphere;

according to the atmospheric temperature and the atmospheric pressure, inquiring an air enthalpy-humidity diagram corresponding to the atmospheric pressure, and determining the atmospheric humidity of the outside atmosphere;

acquiring the exhaust gas temperature and the exhaust gas pressure of an intake and exhaust system of an engine;

according to the exhaust gas temperature and the exhaust gas pressure, an exhaust gas enthalpy-humidity diagram corresponding to the exhaust gas pressure is inquired, and the exhaust gas humidity of an engine air inlet and exhaust system is determined.

Further, after turning on the air pump device, the method further comprises:

acquiring real-time exhaust gas humidity of an air inlet and exhaust system of an engine;

and when the real-time exhaust gas humidity is less than or equal to the preset exhaust gas humidity, closing the air pump device, and resetting a throttle valve, an intake valve and an exhaust valve of the vehicle.

Further, the method for replacing exhaust gas with water vapor in the engine intake and exhaust system by starting the air pump device and allowing the outside atmosphere to flow into the engine intake and exhaust system through the air pump device comprises the following steps:

and opening the air pump device, sucking the outside atmosphere from the throttle valve through the air pump device, flowing the sucked outside atmosphere into the engine intake and exhaust system, and enabling the exhaust gas with water vapor in the engine intake and exhaust system to flow out from the outlet of the silencer.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

the application provides a method for preventing the exhaust pipeline from icing matched with an exhaust system with an air pump device arranged on the exhaust pipeline, which can start to detect whether a vehicle is in a flameout state or not when the atmospheric temperature of the outside atmosphere is determined to be less than or equal to a preset trigger temperature by detecting the atmospheric temperature of the outside atmosphere, open a throttle valve, an intake valve and an exhaust valve of the vehicle when the vehicle is in the flameout state, open the air pump device of the vehicle, enable the outside atmosphere to flow into an engine intake and exhaust system through the air pump device to replace waste gas with water vapor in the engine intake and exhaust system, replace the waste gas with higher humidity in the engine intake and exhaust system through the atmosphere with lower humidity, reduce the water content in the engine intake and exhaust system, reduce the icing amount in the engine intake and exhaust system, and reduce the probability of the exhaust pipeline from being blocked, the performance of the engine is ensured to be in a more certain state; under the optimal condition, the water content in the air intake and exhaust system of the engine can be reduced to a value incapable of being frozen, so that the freezing phenomenon in the air intake and exhaust system of the engine can be avoided, an exhaust pipeline is prevented from being blocked, the performance of the engine cannot be reduced, and the condition that a vehicle cannot be ignited cannot be caused.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method of preventing icing in an exhaust line provided herein;

fig. 2 is a schematic structural diagram of an exhaust system provided with an air pump device on an exhaust pipeline according to the present application;

figure 3 is a psychrometric chart of air at 100287Pa atmospheric pressure.

Reference numerals:

1-gasoline particle catcher, 2-fore muffler, 3-air pump device, 4-rear muffler.

Detailed Description

The embodiment of the application provides a method for preventing exhaust pipe from freezing, and solves the technical problem that exhaust pipe is easy to freeze and is blocked in the low-temperature environment in the prior art.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

a method of preventing icing of an exhaust line, the method comprising: obtaining the atmospheric temperature of the outside atmosphere; when the atmospheric temperature is less than or equal to a preset trigger temperature, detecting whether the vehicle is in a flameout state; when the vehicle is in a flameout state, a throttle valve, an intake valve and an exhaust valve of the vehicle are opened, an air pump device 3 of the vehicle is opened, and outside atmosphere flows into an engine air inlet and exhaust system through the air pump device 3 to replace exhaust gas with water vapor in the engine air inlet and exhaust system, wherein the air pump device 3 is arranged on an exhaust pipeline of the engine air inlet and exhaust system.

The embodiment provides an exhaust system with an air pump device 3 arranged on an exhaust pipeline and a method for preventing the exhaust pipeline from freezing, by detecting the atmospheric temperature of the outside atmosphere, when the atmospheric temperature of the outside atmosphere is determined to be less than or equal to a preset trigger temperature, whether a vehicle is in a flameout state can be detected, when the vehicle is in the flameout state, a throttle valve, an intake valve and an exhaust valve of the vehicle are opened, the air pump device 3 of the vehicle is opened, the outside atmosphere flows into an engine intake and exhaust system through the air pump device 3 to replace exhaust gas with water vapor in the engine intake and exhaust system, exhaust gas with higher humidity in the engine intake and exhaust system is replaced through the atmosphere with lower humidity, the water content in the engine intake and exhaust system is reduced, the freezing amount in the engine intake and exhaust system is reduced, and the probability of blockage of the exhaust pipeline is reduced, the performance of the engine is ensured to be in a more certain state; under the optimal condition, the water content in the air intake and exhaust system of the engine can be reduced to a value incapable of being frozen, so that the freezing phenomenon in the air intake and exhaust system of the engine can be avoided, an exhaust pipeline is prevented from being blocked, the performance of the engine cannot be reduced, and the condition that a vehicle cannot be ignited cannot be caused.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

During use of the vehicle, fuel is combusted inside the engine to generate vehicle driving force. During the combustion of the fuel, water is produced, which is in the form of water vapor due to the high temperature inside the engine. During normal engine operation, water vapor is transferred with the exhaust gases from the engine interior to the exhaust system, which discharges the exhaust gases with the water vapor into the atmosphere. When the engine stops running, namely when the engine is flamed out, a throttle valve, an intake valve and an exhaust valve of the engine are closed, the inside of the engine is a closed environment, one end of an exhaust system is communicated with the engine, and the other end of the exhaust system is communicated with the atmosphere. When the engine forms a closed environment, the end of the exhaust system communicated with the engine is also closed, so that the exhaust system is in a semi-closed state and cannot form gas flow, and then, at the moment when the engine is shut down, the exhaust gas with water vapor inside the exhaust system is retained in the exhaust system.

After the engine is flamed out, the temperature of the waste gas with water vapor in the exhaust system is higher than that of the outside atmosphere, however, as the high-temperature waste gas is not continuously input into the exhaust system after the engine is flamed out, the temperature is lower and lower along with the time, the water vapor in the exhaust system can form liquid water when contacting with the low-temperature pipeline part in the exhaust system, when the temperature of the outside atmosphere is lower than the freezing point temperature, the liquid water can be frozen, the exhaust pipeline is blocked, the performance of the engine is reduced, and when the exhaust port is completely blocked, the engine cannot normally ignite.

The problem of icing of the exhaust system is particularly acute when the vehicle is shut down after being driven at low speed for a short distance. For example, the vehicle is shut down and stopped after traveling for a certain distance at low speed for a short distance, the water vapor in the exhaust system is liquefied into water and then gradually freezes, the vehicle is restarted under the condition that the vehicle is freezing or has been frozen, and the vehicle is shut down and stopped after traveling for a certain distance at low speed for a short distance again, at this time, the ice in the exhaust system is not completely melted, and on the basis of the ice formed before, the water formed by the liquefaction of the newly generated water vapor is continuously frozen, so that the ice is thicker and thicker, and therefore, the icing condition of the exhaust system is particularly serious under the condition that the vehicle is shut down and stopped after traveling for a certain distance at low speed.

In the related art, the drain hole is formed in the lowest position of the exhaust system, liquid water is guided to the drain hole to be drained out of the exhaust system depending on the gravity of the liquid water, however, when a vehicle is parked on a slope for a long time, the liquid water cannot be drained in the mode, and the problem that the exhaust pipeline is frozen and blocked still exists.

As emission standards become more stringent, Gasoline particulate Filter 1 (GPF) has been added to exhaust systems to reduce the amount of solid aerosols or particulates in the exhaust. Be provided with the cellular structure in the petrol particle catcher 1, liquid water is difficult to pass through the cellular structure, and then makes the liquid water in the petrol particle catcher 1 can't pass through the wash port and discharge, and it is thus clear that to the exhaust system who is equipped with petrol particle catcher 1, can't prevent that the exhaust pipe from freezing the jam through the mode that sets up the wash port.

In order to solve the above technical problem, the present embodiment provides a method for preventing an exhaust pipe from icing as shown in fig. 1. The present embodiment also provides an anti-icing exhaust system as shown in fig. 2, which is used in combination with a method for preventing exhaust pipes from icing. As shown in fig. 2, an anti-icing exhaust system includes a gasoline particulate trap 1, a pre-stage muffler 2, an air pump device 3, a post-stage muffler 4, and a connecting pipe. Wherein, gasoline particle trap 1, preceding stage silencer 2, back stage silencer 4 and connecting tube belong to exhaust system's infrastructure among the prior art, and air pump unit 3 is the newly-increased equipment of this embodiment in order to solve the problem of exhaust system icing. The air pump device 3 is electrically connected to an Electronic Control Unit (ECU) of the vehicle, and the Electronic Control Unit controls the air pump device 3 to be turned on and off according to various state information of the vehicle. The air pump device 3 may be a one-way air pump or the like.

For convenience of description, in order to distinguish the engine intake and exhaust system mentioned in step S13, the exhaust system shown in fig. 2 is collectively referred to as an exhaust pipe in the present embodiment. The engine intake and exhaust system referred to in step S13 includes not only the exhaust line shown in fig. 2 but also a throttle valve, an intake valve, and an exhaust valve.

A method for preventing exhaust gas piping from freezing as shown in fig. 1, applied to an electronic control unit of a vehicle, includes (step S11-step S13):

step S11, obtaining the atmospheric temperature of the outside atmosphere;

the water may freeze only when the atmospheric temperature is equal to or lower than the freezing point temperature. Therefore, the possibility of icing in the vehicle's exhaust system exists only when the atmospheric temperature reaches the freezing temperature. When the atmospheric temperature of the external atmosphere is obtained, the frequency of obtaining the temperature may be determined according to actual conditions, for example, may be determined according to factors such as the geographical location (e.g., longitude and latitude, altitude, etc.) where the vehicle is located, the season, and the like. For example, when in northern winter, the frequency of acquiring the atmospheric temperature may be once every ten minutes; when the temperature sensor is in the south winter, the frequency of acquiring the atmospheric temperature can be acquired every two hours; when the vehicle is at an altitude of more than 3000 m and belongs to a colder season, the frequency of acquiring the atmospheric temperature may be acquired every 1 hour.

Typically, the vehicle itself is equipped with a temperature sensor that detects the outside atmosphere, such as an engine ambient temperature sensor. Therefore, the temperature sensor is not required to be additionally arranged to acquire the atmospheric temperature of the external atmosphere, so that the cost is saved.

And step S12, detecting whether the vehicle is in a flameout state or not when the atmospheric temperature is less than or equal to the preset trigger temperature. The preset trigger temperature is less than or equal to the freezing point temperature.

The freezing point refers to the freezing point of water, i.e., the temperature at which water changes from a liquid state to a solid state. The temperature at standard atmospheric pressure is 0 ℃, the standard temperature has a relationship with impurities of water, but the temperature at which the water with impurities changes from a liquid state to a solid state cannot calculate the standard freezing point. The freezing point temperature mentioned in the present embodiment refers to a temperature at which liquid water in the exhaust system freezes.

When water is at freezing temperature, the state of water is actually a critical state between freezing and non-freezing, and therefore, when water is at freezing temperature, freezing is not necessarily caused. Therefore, when the preset trigger temperature is the freezing point temperature, the freezing of the exhaust system is interfered with before the freezing of the exhaust system occurs (the interference measure is described in step S13), and the freezing and blocking of the exhaust system can be almost completely avoided.

When the preset trigger temperature is lower than the temperature value of the freezing point temperature, when the exhaust system begins to freeze, the freezing condition of the exhaust system is interfered, so that the freezing amount in the exhaust system can be greatly reduced, and the accumulation of the freezing amount in the exhaust system is reduced.

When the atmospheric temperature is less than or equal to the preset trigger temperature, it means that the possibility of the exhaust system of the vehicle freezing is high after the vehicle is shut down, and in order to avoid the exhaust system freezing and blocking, it is necessary to detect whether the vehicle is in a shut down state, and as long as the vehicle is in a shut down state, measures for preventing the exhaust system from freezing need to be taken (specific measures will be described in step S13).

The manner of detecting whether the vehicle is in the key-off state includes (step S21-step S22):

step S21, detecting whether the gear of a gearbox of a vehicle is in a parking gear to obtain a first detection result, and detecting whether the vehicle generates an accelerator pedal signal, a brake pedal signal and a clutch pedal signal to obtain a second detection result;

and step S22, determining whether the vehicle is in a flameout state or not according to the first detection result and the second detection result.

When a gearbox gear of the vehicle is in a parking gear and the vehicle does not generate an accelerator pedal signal, a brake pedal signal and a clutch pedal signal, determining that the vehicle is in a flameout state.

When the gearbox gear of the vehicle is in the parking gear, this means that the vehicle is currently in a standstill. However, the vehicle being in a standstill state does not mean that the vehicle is in a key-off state. For example, when the vehicle is waiting at a traffic light, the gearbox gear may be in park. Therefore, it is also necessary to determine whether the vehicle generates an accelerator pedal signal, a brake pedal signal and a clutch pedal signal when the transmission gear of the vehicle is in a parking position and the vehicle does not generate the accelerator pedal signal, the brake pedal signal and the clutch pedal signal, which means that the vehicle is in a key-off state, i.e. the vehicle is temporarily or permanently in a non-activated state.

After determining that the vehicle is in the key-off state, step S13 is executed.

And step S13, when the vehicle is in a flameout state, opening a throttle valve, an intake valve and an exhaust valve of the vehicle, opening an air pump device 3 of the vehicle, and making the outside atmosphere flow into an engine intake and exhaust system through the air pump device 3 so as to replace the exhaust gas with water vapor in the engine intake and exhaust system, wherein the air pump device 3 is arranged on an exhaust pipeline of the engine intake and exhaust system.

When the vehicle is in a flameout state, the temperature of the water vapor in the exhaust pipeline is gradually lower than the dew point temperature, the water vapor is gradually changed into liquid water, and the possibility of icing exists, and at the moment, the icing phenomenon needs to be prevented or intervened.

As can be seen from the enthalpy diagram of air ratio shown in fig. 3, when the temperature is low below zero, the moisture content in the air is very low, and therefore, when the atmospheric temperature is lower than the preset trigger temperature, it means that the humidity in the air is very low, and the atmospheric humidity is necessarily lower than the humidity of the exhaust gas inside the engine intake and exhaust system, so the exhaust gas inside the engine intake and exhaust system can be replaced by the atmospheric air.

The air pump device 3 is used for enabling the outside atmosphere to flow into an engine air inlet and exhaust system so as to replace exhaust gas with water vapor in the engine air inlet and exhaust system, and specifically comprises the following steps: the external atmosphere is sucked from the throttle valve through the air pump device 3, flows into the engine intake and exhaust system, and makes the exhaust gas with water vapor in the engine intake and exhaust system flow out from the outlet of the muffler, and by taking fig. 2 as an example, the external atmosphere flows in from the left side of the exhaust pipeline and flows out from the right side of the exhaust pipeline. Since the air cleaner is arranged in the engine intake and exhaust system, if the atmosphere flows in from the outlet of the rear-stage muffler 4 of the engine intake and exhaust system and flows out from the throttle valve (taking fig. 2 as an example, the outside atmosphere flows in from the right side of the exhaust pipeline and flows out from the left side of the exhaust pipeline), impurities in the air cleaner can enter the engine cylinder, and the cleanliness of the engine cylinder is affected. Therefore, the flow of the outside air can only flow in from the throttle valve of the engine and flow out from the outlet of the rear muffler 4 of the engine intake and exhaust system.

After the vehicle is determined to be in a flameout state, the throttle valve, the intake valve and the exhaust valve of the vehicle are opened, so that the air flow of the engine intake and exhaust system can be realized, namely, air can enter from the throttle valve, sequentially pass through the intake valve and the exhaust valve and finally flow out from the outlet of the rear-stage silencer 4 of the exhaust pipeline. The engine intake and exhaust system is a system including a throttle valve, an intake valve, an exhaust valve, and an exhaust line (the exhaust line is a line shown in fig. 2).

After the air flow of the air inlet and exhaust system of the engine can be realized, the air pump device 3 of the vehicle is started to provide power for the air in the air inlet and exhaust system of the engine, the air pump device 3 drives the outside atmosphere to flow into the air inlet and exhaust system of the engine, so that the outside atmosphere discharges the waste gas with water vapor in the air inlet and exhaust system of the engine into the atmosphere, the humidity in the air inlet and exhaust system of the engine is further reduced, the freezing and blocking of an exhaust pipeline are avoided, or the freezing amount in the exhaust pipeline is reduced.

The embodiment provides an exhaust system with an air pump device 3 arranged on an exhaust pipeline and a method for preventing the exhaust pipeline from freezing, by detecting the atmospheric temperature of the outside atmosphere, when the atmospheric temperature of the outside atmosphere is determined to be less than or equal to a preset trigger temperature, whether a vehicle is in a flameout state can be detected, when the vehicle is in the flameout state, a throttle valve, an intake valve and an exhaust valve of the vehicle are opened, the air pump device 3 of the vehicle is opened, the outside atmosphere flows into an engine intake and exhaust system through the air pump device 3 to replace exhaust gas with water vapor in the engine intake and exhaust system, exhaust gas with higher humidity in the engine intake and exhaust system is replaced through the atmosphere with lower humidity, the water content in the engine intake and exhaust system is reduced, the freezing amount in the engine intake and exhaust system is reduced, and the probability of blockage of the exhaust pipeline is reduced, the performance of the engine is ensured to be in a more certain state; under the optimal condition, the water content in the air intake and exhaust system of the engine can be reduced to a value incapable of being frozen, so that the freezing phenomenon in the air intake and exhaust system of the engine can be avoided, an exhaust pipeline is prevented from being blocked, the performance of the engine cannot be reduced, and the condition that a vehicle cannot be ignited cannot be caused.

In step S13, after determining that the vehicle is in a stalled state, before opening the throttle, intake, and exhaust valves of the vehicle, the method further comprises:

step S31, judging whether the duration time of the vehicle in the flameout state exceeds the preset flameout duration time or not;

in step S32, if yes, the air pump device 3 of the vehicle is opened by opening the throttle valve, the intake valve, and the exhaust valve of the vehicle.

The vehicle may only be temporarily shut down and when the vehicle is only temporarily shut down, it is not necessary to use the atmosphere to replace the exhaust gases in the engine intake and exhaust system. In order to distinguish whether the vehicle is temporarily turned off, the present embodiment sets a preset key-off period.

When the duration time of the vehicle in the flameout state exceeds the preset flameout duration time, the vehicle is considered to be temporarily not started for a long time, and the water vapor in the air intake and exhaust system of the engine may possibly cause the icing phenomenon, so that the steps of opening the throttle valve, the intake valve and the exhaust valve of the vehicle and opening the air pump device 3 of the vehicle can be executed, and the external atmosphere is used for replacing the exhaust gas containing the water vapor in the air intake and exhaust system of the engine.

When the duration time of the vehicle in the flameout state does not exceed the preset flameout duration time and the vehicle is restarted, the engine is considered to continue to operate, the temperature inside the air intake and exhaust system of the engine is always kept at a high temperature value, and the icing phenomenon is avoided, so that the steps of opening a throttle valve, an intake valve and an exhaust valve of the vehicle and opening an air pump device 3 of the vehicle are not required.

The specific process of opening the intake and exhaust valves of the vehicle is as follows:

step S41, acquiring the positions of an intake valve and an exhaust valve collected by a position sensor of the vehicle;

in step S42, after the position of the intake and exhaust valves is determined, the intake and exhaust valves are opened.

After the vehicle is turned off, the positions of the intake and exhaust valves of the vehicle are uncertain, and therefore, the intake and exhaust valves cannot be opened without knowing the positions of the intake and exhaust valves. Therefore, it is necessary to acquire the positions of the intake and exhaust valves from a position sensor of the vehicle, and the operation of opening the intake and exhaust valves may be performed after the positions of the intake and exhaust valves are known.

Maintaining the open states of the throttle valve, intake valve, and exhaust valve of the vehicle, and maintaining the activated state of the air pump device 3 of the vehicle are required to consume the battery power of the vehicle. In order to avoid excessive battery power consumption, the operation time of the air pump device 3 needs to be limited, which is as follows:

and when the opening duration of the air pump device 3 reaches the preset exhaust duration, closing the air pump device 3 and resetting a throttle valve, an intake valve and an exhaust valve of the vehicle.

And monitoring the opening time of the air pump device 3, and closing the air pump device 3 to reset a throttle valve, an intake valve and an exhaust valve of the vehicle after the opening time reaches the preset exhaust time.

The preset exhaust period may be determined according to the following manner:

step S51, acquiring the atmospheric humidity of the outside atmosphere, the exhaust gas humidity of the engine air intake and exhaust system, the volume of the engine air intake and exhaust system and the exhaust efficiency of the air pump device 3;

in step S52, a preset exhaust time period is determined based on the amount of difference between the atmospheric humidity and the exhaust gas humidity, the volume, and the exhaust efficiency.

The atmospheric humidity of the outside atmosphere and the exhaust gas humidity inside the engine air inlet and exhaust system are obtained, and the preset exhaust time can be preliminarily estimated according to the difference between the atmospheric humidity and the exhaust gas humidity. The preset exhaust time period can be accurately calculated by combining the volume of the engine intake and exhaust system (i.e. the amount of exhaust gas to be exhausted) and the exhaust efficiency of the air pump device 3.

The atmospheric humidity of the outside atmosphere and the exhaust gas humidity of the engine air inlet and exhaust system can be detected by installing a humidity sensor and can also be obtained by the following method:

step S61, acquiring atmospheric pressure of the outside atmosphere;

step S62, according to the atmospheric temperature and the atmospheric pressure, the psychrometric chart of the air corresponding to the atmospheric pressure is searched to determine the atmospheric humidity of the outside atmosphere.

The atmospheric pressure can be obtained by a sensor integrated with the vehicle, and the psychrometric chart shown in fig. 3 is queried according to the atmospheric temperature (which may be the data collected in step S11) and the atmospheric pressure, so that the atmospheric humidity of the outside atmosphere can be determined, and further, a humidity sensor does not need to be additionally installed, thereby saving the cost.

Step S63, acquiring the exhaust gas temperature and the exhaust gas pressure of an engine intake and exhaust system;

and step S64, inquiring an exhaust gas enthalpy-humidity diagram corresponding to the exhaust gas pressure according to the exhaust gas temperature and the exhaust gas pressure, and determining the exhaust gas humidity of the air inlet and exhaust system of the engine.

The exhaust gas temperature that the exhaust temperature sensor who acquires the vehicle gathered to and the exhaust pressure that vehicle self integrated sensor acquireed, according to exhaust gas temperature and exhaust pressure, confirm exhaust gas humidity in the exhaust gas enthalpy-humidity diagram that this vehicle corresponds, and then can need not additionally install humidity transducer, save the cost. It should be noted that exhaust enthalpy diagrams of different vehicle types are different, and in practical application, the corresponding exhaust enthalpy diagram should be determined according to the vehicle type of the target vehicle.

In addition to determining the closing timing of the air pump device 3 by setting the preset air discharge period, the closing timing of the air pump device 3 may be determined by:

step S71, acquiring real-time exhaust gas humidity of an air inlet and exhaust system of the engine;

in step S72, when the real-time exhaust gas humidity is equal to or less than the preset exhaust gas humidity, the air pump device 3 is closed, and the throttle valve, the intake valve, and the exhaust valve of the vehicle are reset.

A humidity sensor may be provided in the engine intake and exhaust system to determine the closing timing of the air pump device 3 by detecting the real-time exhaust gas humidity of the engine intake and exhaust system. The manner in which the step S71 and the step S72 determine the closing timing of the air pump device 3 through the real-time exhaust gas humidity is more accurate than the manner in which the closing timing of the air pump device 3 is determined provided in the steps S51 and S52.

Further, the present embodiment further provides an emergency interruption measure for the air pump device 3, which is as follows:

step S81, when the air pump device 3 is in the open state, detecting whether the vehicle has interruption triggering event, wherein the interruption triggering event comprises any one or more events of gear change of the gearbox, ignition starting, signal of an accelerator pedal, signal of a brake pedal, signal of a clutch pedal and battery voltage lower than a preset voltage value;

in step S82, if yes, the air pump device 3 is closed, and the throttle valve, intake valve, and exhaust valve of the vehicle are reset.

When the air pump device 3 is in an open state, whether an interruption triggering event occurs to the vehicle is detected in real time, as long as the interruption triggering event is detected, the vehicle is switched to an operating state instead of being in a flameout state, exhaust gas in an air inlet and exhaust system of an engine does not need to be replaced at the moment, the air pump device 3 is closed, and a throttle valve, an inlet valve and an exhaust valve of the vehicle are reset.

The interruption triggering event comprises the gear change of the gearbox, the ignition starting, the generation of an accelerator pedal signal, the generation of a brake pedal signal, the generation of a clutch pedal signal and the condition that the voltage of the battery is lower than a preset voltage value, and as long as one event occurs, the air pump device 3 needs to be immediately closed, and the throttle valve, the intake valve and the exhaust valve of the vehicle need to be reset.

In summary, the present embodiment provides an exhaust system with an air pump device 3 disposed on an exhaust pipeline and a method for preventing the exhaust pipeline from freezing, by detecting the atmospheric temperature of the outside atmosphere, when it is determined that the atmospheric temperature of the outside atmosphere is less than or equal to a preset trigger temperature, it can start to detect whether a vehicle is in a flameout state, when the vehicle is in the flameout state, a throttle valve, an intake valve and an exhaust valve of the vehicle are opened, the air pump device 3 of the vehicle is opened, the outside atmosphere flows into an engine intake and exhaust system through the air pump device 3 to replace exhaust gas with water vapor in the engine intake and exhaust system, the exhaust gas with higher humidity in the engine intake and exhaust system is replaced by the atmosphere with lower humidity, the water content in the engine intake and exhaust system is reduced, the freezing amount in the engine intake and exhaust system is reduced, so as to reduce the probability of blockage of the exhaust pipeline, the performance of the engine is ensured to be in a more certain state; under the optimal condition, the water content in the air intake and exhaust system of the engine can be reduced to a value incapable of being frozen, so that the freezing phenomenon in the air intake and exhaust system of the engine can be avoided, an exhaust pipeline is prevented from being blocked, the performance of the engine cannot be reduced, and the condition that a vehicle cannot be ignited cannot be caused.

Since the electronic device described in this embodiment is an electronic device used for implementing the method for processing information in this embodiment, a person skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various variations thereof based on the method for processing information described in this embodiment, and therefore, how to implement the method in this embodiment by the electronic device is not described in detail here. Electronic devices used by those skilled in the art to implement the method for processing information in the embodiments of the present application are all within the scope of the present application.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.