CN113006906A

CN113006906A - Exhaust gas heating device, exhaust gas heating method and automobile

Info

Publication number: CN113006906A
Application number: CN202110347223.5A
Authority: CN
Inventors: 陈子兵; 李艳光; 黄波
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-06-22
Anticipated expiration: 2041-03-31
Also published as: CN113006906B

Abstract

The disclosure relates to a tail gas heating device, a tail gas heating method and an automobile, and belongs to the field of automobiles. The tail gas heating device comprises a gas storage tank, a first pressure sensor, a first control valve, a second pressure sensor, a second control valve, a heater and a control unit. The gas storage box is provided with a gas inlet, a gas outlet, a gas collecting cavity and a gas heating cavity, the gas collecting cavity can be communicated with the gas heating cavity, the gas inlet is communicated with the gas collecting cavity, the gas outlet is communicated with the gas heating cavity, the gas inlet is communicated with an exhaust port of an engine, and the gas outlet is communicated with a gas inlet of a tail gas treatment device. The first pressure sensor is located within the gas collection cavity. The first control valve is positioned between the gas collecting cavity and the gas heating cavity and used for controlling the communication state of the gas collecting cavity and the gas heating cavity. A second pressure sensor is located within the gas heating cavity. The second control valve is located at the air outlet. A heater is located within the gas heating cavity.

Description

Exhaust gas heating device, exhaust gas heating method and automobile

Technical Field

The disclosure relates to the field of automobiles, in particular to an exhaust heating device, an exhaust heating method and an automobile.

Background

The automobile can produce tail gas at the in-process of operation, and tail gas enters into exhaust treatment device, and exhaust treatment device purifies back with exhaust emission again to alleviate the pollution of tail gas to the environment.

The purification efficiency of the tail gas treatment device on the tail gas is related to the temperature of the tail gas. The higher the temperature of the tail gas is, the higher the purification efficiency of the tail gas treatment device on the tail gas is; the lower the temperature of the exhaust gas is, the lower the purification efficiency of the exhaust gas treatment device on the exhaust gas is.

At the cold start stage of car, start under the condition that engine water temperature is low promptly, the temperature of tail gas is lower, and tail gas processing apparatus is lower to the purification efficiency of tail gas, can't realize effective purification, can cause the pollution to the environment.

Disclosure of Invention

The embodiment of the disclosure provides a tail gas heating device, a tail gas heating method and an automobile, which can improve the purification efficiency of a tail gas treatment device and reduce the pollution of tail gas to the environment. The technical scheme is as follows:

in one aspect, the present disclosure provides a tail gas heating device, comprising: the gas storage box is provided with a gas inlet, a gas outlet, a gas collecting cavity, a gas heating cavity and a partition plate, the gas inlet is communicated with the gas collecting cavity, the gas outlet is communicated with the gas heating cavity, the partition plate is positioned between the gas collecting cavity and the gas heating cavity, the gas inlet is communicated with an exhaust port of an engine, and the gas outlet is communicated with a gas inlet of a tail gas treatment device; a first pressure sensor located within the gas collection cavity; the first control valve is positioned on the partition plate and used for controlling the communication state of the gas collecting cavity and the gas heating cavity; a second pressure sensor located within the gas heating cavity; the second control valve is positioned at the air outlet; a heater located within the gas heating cavity; the control unit is configured to control the first control valve to be closed when the first pressure detected by the first pressure sensor is smaller than a first pressure threshold value and to control the first control valve to be opened when the first pressure detected by the first pressure sensor is larger than or equal to the first pressure threshold value in a cold starting stage of the engine; and when the second pressure detected by the second pressure sensor is smaller than a second pressure threshold value, controlling the second control valve to be closed, and when the second pressure detected by the second pressure sensor is larger than or equal to the second pressure threshold value, controlling the second control valve to be opened, wherein the second pressure threshold value is larger than the first pressure threshold value.

In one implementation of the embodiments of the present disclosure, the first pressure threshold is between 0.02 megapascals and 0.15 megapascals and the second pressure threshold is between 0.2 megapascals and 0.4 megapascals.

In an implementation manner of the embodiment of the present disclosure, the control unit is further electrically connected to the heater and the controller area network bus, respectively, and is configured to receive engine water temperature information transmitted by the controller area network bus, where the engine water temperature information is used to indicate a stage where an engine is located, where an engine water temperature indicated by the engine water temperature information is less than a temperature threshold value to indicate the cold start stage, and where the engine water temperature indicated by the engine water temperature information is greater than or equal to the temperature threshold value to indicate a normal operation stage; the control unit is further configured to control the heater to operate when the engine is in the cold start phase, control the heater to stop operating when the engine is in the normal operation phase, and control both the first control valve and the second control valve to be opened.

In one implementation of the embodiment of the present disclosure, the exhaust gas heating apparatus further includes: the air suction pressurization pump is positioned at the air inlet and is electrically connected with the control unit; the control unit is further configured to control the intake air pressure pump to operate when the engine is in the cold start phase, and to control the intake air pressure pump to stop operating when the engine is in the normal operation phase.

In one implementation of the disclosed embodiment, the temperature threshold is between 85 degrees celsius and 95 degrees celsius.

In one implementation of the embodiment of the present disclosure, the first control valve and the second control valve are both one-way control valves.

In another aspect, an embodiment of the present disclosure provides an exhaust gas heating method for controlling the exhaust gas heating apparatus according to any one of the above aspects, where the method includes: when the engine is in a cold start stage, acquiring first pressure in a gas collection cavity detected by a first pressure sensor; controlling a first control valve to close when the first pressure is less than a first pressure threshold; when the first pressure is greater than or equal to the first pressure threshold value, controlling the first control valve to open; when the engine is in a cold start stage, acquiring second pressure in the gas heating cavity detected by a second pressure sensor; controlling a second control valve to close when the second pressure is less than a second pressure threshold; and when the second pressure is larger than or equal to the second pressure threshold value, controlling the second control valve to open.

In an implementation manner of the embodiment of the present disclosure, the method further includes: acquiring the water temperature of an engine; stage of judging the described engine according to the described engine water temp; and when the engine is in a cold start stage, controlling the heater to work, and when the engine is in a normal operation stage, controlling the heater to stop working and controlling the first control valve and the second control valve to be opened.

In an implementation manner of the embodiment of the present disclosure, the method further includes: and when the engine is in the cold starting stage, controlling the suction pressurization pump to work, and when the engine is in the normal operation stage, controlling the suction pressurization pump to stop working.

In another aspect, the present disclosure provides an automobile, which includes the exhaust gas heating device according to any one of the above aspects.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

in the embodiment of the disclosure, when the automobile is in cold start, exhaust gas discharged from the engine flows to the air inlet of the gas storage box through the exhaust port of the engine and enters the gas collection cavity through the air inlet. Tail gas in the gas collection cavity is increased gradually for first pressure in the gas collection cavity increases, and first pressure sensor detects first pressure in the gas collection cavity, and transmits first pressure with the mode of signal of telecommunication for the control unit. When the first pressure is increased to be greater than or equal to the first pressure threshold value, the control unit controls the first control valve to be opened, so that the tail gas in the gas collecting cavity enters the gas heating cavity. Tail gas is heated by the heater in the gas heating cavity, and tail gas in the gas heating cavity increases gradually for the second pressure in the gas heating cavity increases, and second pressure sensor detects the second pressure in the gas heating cavity, and transmits the second pressure with the mode of signal of telecommunication for the control unit. When the second pressure is increased to be greater than or equal to the second pressure threshold value, the control unit controls the second control valve to be opened, so that the heated tail gas enters the tail gas treatment device through the gas outlet and enters the tail gas treatment device. Because the temperature of tail gas increases for tail gas processing apparatus is higher to the purification efficiency of tail gas, reduces the pollution of tail gas to the environment.

Because the first control valve is opened when the first pressure in the gas collection cavity is greater than or equal to the first pressure threshold value, make tail gas can concentrate and get into and heat in the gas heating cavity, on the one hand, improve the utilization ratio to the heat source, avoid the wasting of resources, on the other hand, it is more to avoid the tail gas in the gas heating cavity, make the heater can't carry out abundant heating to tail gas, make the temperature of tail gas lower, reduced the purification efficiency of tail gas processing apparatus to tail gas. Because the second control valve is opened when the second pressure in the gas heating cavity is greater than or equal to the second pressure threshold value, make tail gas can get into tail gas processing apparatus, guarantee that tail gas can stay a period in the gas heating cavity, and heated, guarantee that tail gas can be fully heated, avoid tail gas not fully heated, the temperature is lower, make tail gas processing apparatus become low to the purification efficiency of tail gas.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, 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 only some embodiments of the present disclosure, 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 schematic structural diagram of an exhaust gas heating device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an exhaust gas heating device according to an embodiment of the present disclosure;

fig. 3 is a flowchart of a method for heating exhaust according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an exhaust gas heating device according to an embodiment of the present disclosure. Referring to fig. 1, the exhaust gas heating apparatus includes: a gas storage tank 10, a first pressure sensor 20, a first control valve 30, a second pressure sensor 40, a second control valve 50, a heater 60, and a control unit 70.

The gas storage box 10 is provided with a gas inlet 101, a gas outlet 102, a gas collecting cavity 103, a gas heating cavity 104 and a partition 105, the gas collecting cavity 103 can be communicated with the gas heating cavity 104, the partition 105 is located between the gas collecting cavity 103 and the gas heating cavity 104, the gas inlet 101 is communicated with the gas collecting cavity 103, the gas outlet 102 is communicated with the gas heating cavity 104, the gas inlet 101 is communicated with an exhaust port of an engine, and the gas outlet 102 is communicated with a gas inlet of a tail gas treatment device. The first pressure sensor 20 is located within the gas collection chamber 103. The first control valve 30 is located on the gas baffle 105, and the first control valve 30 is used for controlling the communication state of the gas collection cavity 103 and the gas heating cavity 104. Second pressure sensor 40 is located within gas heating chamber 104. Second control valve 50 is located at outlet 102. The heater 60 is located within the gas heating chamber 104.

Wherein the control unit 70 is configured to control the first control valve 30 to close when the first pressure detected by the first pressure sensor 20 is less than a first pressure threshold value, and to control the first control valve 30 to open when the first pressure detected by the first pressure sensor 20 is greater than or equal to the first pressure threshold value, when the engine is in a cold start phase. The second control valve 50 is controlled to close when the second pressure detected by the second pressure sensor 40 is less than a second pressure threshold, and the second control valve 50 is controlled to open when the second pressure detected by the second pressure sensor 40 is greater than or equal to the second pressure threshold, which is greater than the first pressure threshold.

In the disclosed embodiment, at the time of cold start of the automobile, exhaust gas discharged from the engine flows to the air inlet 101 of the gas storage tank 10 through the exhaust port of the engine, and enters the gas collection cavity 103 through the air inlet 101. The exhaust gas in the gas collecting cavity 103 is gradually increased, so that the first pressure in the gas collecting cavity 103 is increased, and the first pressure sensor 20 detects the first pressure in the gas collecting cavity 103 and transmits the first pressure to the control unit 70 in the form of an electric signal. When the first pressure increases to be greater than or equal to the first pressure threshold, the control unit 70 controls the first control valve 30 to open, so that the exhaust gas in the gas collection cavity 103 enters the gas heating cavity 104. The exhaust gas is heated by the heater 60 in the gas heating chamber 104, and when the exhaust gas in the gas heating chamber 104 increases gradually, so that the second pressure in the gas heating chamber 104 increases, the second pressure sensor 40 detects the second pressure in the gas heating chamber and transmits the second pressure to the control unit 70 in the form of an electrical signal. When the second pressure increases to be greater than or equal to the second pressure threshold, the control unit 70 controls the second control valve 50 to open, so that the heated exhaust gas enters the exhaust gas treatment device air inlet through the air outlet 102 and enters the exhaust gas treatment device. Because the temperature of tail gas increases for tail gas processing apparatus is higher to the purification efficiency of tail gas, reduces the pollution of tail gas to the environment.

Because first control valve 30 opens when the first pressure in gas collecting cavity 103 is greater than or equal to first pressure threshold for tail gas can concentrate and get into and heat in gas heating cavity 104, on the one hand, improve the utilization ratio to the heat source, avoid the wasting of resources, on the other hand, it is more to avoid the tail gas in gas heating cavity 104, make heater 60 can't carry out the abundant heating to tail gas, make the temperature of tail gas lower, reduced the purification efficiency of tail gas processing apparatus to tail gas. Because second control valve 50 opens when the second pressure in gaseous heating cavity 104 is greater than or equal to the second pressure threshold value for tail gas can get into tail gas processing apparatus, guarantees that tail gas can stop a period in gaseous heating cavity 104, and is heated, guarantees that tail gas can be fully heated, avoids tail gas not fully heated, and the temperature is lower, makes tail gas processing apparatus become low to the purification efficiency of tail gas.

In the embodiment of the present disclosure, the second pressure threshold is greater than the first pressure threshold, and since the gas collection cavity 103 is to enable the exhaust gas to enter the gas heating cavity 104 intensively, as long as it is ensured that the exhaust gas can enter the gas heating cavity 104 with a clearance, the first pressure threshold can be set to be slightly smaller. Gas heating cavity 104 heats gas, needs tail gas to dwell longer time at gas heating cavity 104, just can guarantee that tail gas can be fully heated, so need be slightly bigger with the setting of second pressure threshold value.

In one implementation of an embodiment of the present disclosure, the first pressure threshold is between 0.02 megapascals and 0.15 megapascals. The first pressure sensor 20 measures pressure, but is generally known as pressure in engineering, and is therefore in mpa.

In the embodiment of the present disclosure, the first pressure threshold is set between 0.02 mpa and 0.15 mpa, which not only can ensure that the exhaust gas can enter the gas heating cavity 104 in a clearance manner, but also can prevent the gas storage tank 10 from being damaged due to the excessive first pressure in the gas collection cavity 103.

Illustratively, the first pressure threshold is 0.05 megapascals.

In one implementation of an embodiment of the present disclosure, the second pressure threshold is between 0.2 megapascals and 0.4 megapascals.

In the embodiment of the present disclosure, the second pressure threshold is set between 0.2 mpa and 0.4 mpa, which not only ensures that the tail gas can stay in the gas heating cavity 104 for a long time and be sufficiently heated, but also prevents the gas storage tank 10 from being damaged due to the excessive second pressure in the gas heating cavity 104.

Illustratively, the second pressure threshold is 0.3 megapascals.

In the disclosed embodiment, the gas storage tank 10 may be a stainless steel storage tank, which ensures the strength of the gas storage tank 10, and prevents the tank from being damaged by the gas in the collection and heating cavities.

In the embodiment of the present disclosure, the outer sidewall of the partition 105 is attached to the inner sidewall of the gas storage tank 10, and the extending direction of the partition 105 is perpendicular to the length direction of the gas storage tank 10. The first control valve 30 is located at the middle of the partition 105. When the first control valve 30 is closed, it is ensured that the gas collection chamber 103 and the gas heating chamber 104 are not in communication.

As shown in fig. 1, the first pressure sensor 20 and the second pressure sensor 40 are located on the inner sidewall of the gas storage tank 10.

In the disclosed embodiment, the heater 60 may be an electric heating wire.

Exemplarily, the electric heating wire can be in a spiral shape, so that the contact area of the electric heating wire and the tail gas is increased, and the heating efficiency is increased.

In the disclosed embodiment, the number of the heaters 60 is between 2 and 10, which ensures that the exhaust gas in the gas heating chamber 104 can be sufficiently heated. As shown in fig. 1, the exhaust gas heating apparatus includes 6 heaters 60.

In one implementation of the disclosed embodiment, the first control valve 30 is a first one-way control valve.

In the embodiment of the present disclosure, the first control valve 30 is arranged as a first one-way control valve, so that the tail gas can only flow from the exhaust port of the engine to the gas collecting cavity 103, and cannot flow from the gas collecting cavity 103 to the exhaust port of the engine, thereby avoiding the occurrence of the situation of backflow of the tail gas, which causes flameout of the engine.

In one implementation of the disclosed embodiment, the second control valve 50 is a second one-way control valve.

In the embodiment of the present disclosure, the second control valve 50 is arranged as a second one-way control valve, so that the tail gas can only flow from the gas collecting cavity 103 to the gas heating cavity 104, and cannot flow from the gas heating cavity 104 to the gas collecting cavity 103, and the situation of backflow of the tail gas can be avoided, which causes engine stall.

In an implementation manner of the embodiment of the present disclosure, the control unit 70 is further electrically connected to the heater 60 and a Controller Area Network (CAN) bus, respectively, and the control unit 70 is configured to receive engine water temperature information transmitted by the Controller Area Network bus.

The controller local area network bus is connected with various electronic components in the automobile and used for transmitting signals of the electronic components, wherein the signals include signals for detecting the water temperature of an engine, the signals for detecting the water temperature of the engine represent information of the water temperature of the engine, the information of the water temperature of the engine is used for representing the stage of the engine, the cold start stage is represented by the fact that the water temperature of the engine indicated by the information of the water temperature of the engine is smaller than a temperature threshold, and the normal operation stage is represented by the fact that the water temperature of the engine indicated by the information of the.

Wherein the control unit 70 is further configured to control the heater 60 to operate when the engine is in a cold start phase, and to control the heater 60 to stop operating and control both the first control valve 30 and the second control valve 50 to open when the engine is in a normal operation phase.

The engine water temperature is related to the exhaust gas temperature, the higher the engine water temperature is and the higher the exhaust gas temperature is, and the lower the engine water temperature is and the lower the exhaust gas temperature is. In the embodiment of the present disclosure, the control unit 70 is electrically connected to the controller area network bus, so that the control unit 70 can receive the engine water temperature information, and the control unit 70 determines the stage of the engine according to the engine water temperature information. When the temperature of the water in the engine is lower than the temperature threshold, it indicates that the temperature of the tail gas is lower at this time, and the engine is in a cold start stage, the control unit 70 controls the heater 60 to work to heat the tail gas in the gas heating cavity 104, so as to avoid the lower purification efficiency of the tail gas treatment device caused by the lower temperature of the tail gas. When the water temperature of the engine is greater than or equal to the temperature threshold, the temperature of the tail gas is higher, the engine is in a normal operation stage, the tail gas does not need to be heated, the purification efficiency of the tail gas heating device can be ensured, and the control unit 70 controls the heater 60 to stop working at the moment, so that resource waste is avoided. And meanwhile, the first control valve 30 and the second control valve 50 are controlled to be opened, so that the tail gas directly enters the tail gas treatment device through the tail gas heating device, namely the tail gas heating device does not work at the moment, and the resource waste is reduced.

In one implementation of an embodiment of the present disclosure, the temperature threshold is between 85 degrees celsius (° c) and 95 degrees celsius.

In the embodiment of the disclosure, the temperature threshold is set between 85 ℃ and 95 ℃, so that the tail gas can be heated at a low temperature, and resource waste caused by the fact that the temperature of the tail gas is high and the tail gas is still heated is avoided.

Fig. 2 is a schematic structural diagram of an exhaust gas heating device according to an embodiment of the present disclosure. Referring to fig. 2, the exhaust gas heating apparatus further includes: and the suction pressurizing pump 80, the suction pressurizing pump 80 is positioned at the air inlet 101, and the suction pressurizing pump 80 is electrically connected with the control unit 70.

Wherein the control unit 70 is further configured to control the suction booster pump 80 to operate when the engine is in a cold start phase, and to control the suction booster pump 80 to stop operating when the engine is in a normal operation phase.

The cold start stage of the automobile is generally the stage when the automobile is just started, and at the moment, the tail gas in the engine may not flow and cannot flow to the tail gas heating device, and if the tail gas is accumulated in the engine all the time, the engine is likely to be flamed out. In the disclosed embodiment, the suction booster pump 80 is arranged, and when the engine is in a cold start stage, the suction booster pump 80 conveys the exhaust gas from the engine to the exhaust gas heating device, so that the engine is prevented from stalling. Meanwhile, when the water temperature of the engine is greater than or equal to the temperature threshold, the automobile is started for a period of time, the engine is in a normal operation stage, the tail gas can flow smoothly, and the control unit 70 controls the air suction pressurizing pump 80 to stop working, so that resource waste is avoided.

In the embodiment of the present disclosure, when the suction booster pump 80 stops operating, the suction booster pump 80 is in a long-pass state, so that the exhaust gas can smoothly enter the exhaust gas heating device.

Since a temperature sensor is disposed in the engine to measure the temperature of the engine water. In the embodiment of the disclosure, the water temperature of the engine is directly used, so that the temperature sensing of the tail gas heating device is avoided, and the volume of the tail gas heating device is increased.

The embodiment of the disclosure also provides an exhaust gas heating method, which is used for controlling the exhaust gas heating device shown in fig. 1 or fig. 2.

Fig. 3 is a flowchart of a method for heating exhaust according to an embodiment of the present disclosure. Referring to fig. 3, the method includes:

in step S310, a first pressure in the gas collection cavity detected by the first pressure sensor is obtained while the engine is in a cold start phase.

In the embodiment of the disclosure, when the automobile is in cold start, exhaust gas discharged from the engine flows to the air inlet of the gas storage box through the exhaust port of the engine and enters the gas collection cavity through the air inlet. Tail gas in the gas collection cavity is increased gradually for first pressure in the gas collection cavity increases, and first pressure sensor detects first pressure in the gas collection cavity, and transmits first pressure with the mode of signal of telecommunication for the control unit.

In step S311, when the first pressure is less than the first pressure threshold, controlling the first control valve to close; and when the first pressure is greater than or equal to the first pressure threshold value, controlling the first control valve to open.

When the first pressure is smaller than the first pressure threshold, the exhaust gas in the gas collection cavity is less at the moment, and the control unit controls the first control valve to close. When the first pressure is increased to be greater than or equal to the first pressure threshold value, which indicates that more tail gas exists in the gas collecting cavity at the moment, the control unit controls the first control valve to open, so that the tail gas in the gas collecting cavity intensively enters the gas heating cavity, and the tail gas is heated by the heater in the gas heating cavity.

In step S312, a second pressure in the gas heating cavity detected by the second pressure sensor is obtained when the engine is in a cold start stage.

And tail gas in the gas heating cavity is gradually increased, so that the second pressure in the gas heating cavity is increased, the second pressure sensor detects the second pressure in the gas heating cavity, and the second pressure is transmitted to the control unit in an electric signal mode.

In step S313, controlling the second control valve to close when the second pressure is less than the second pressure threshold; and controlling the second control valve to open when the second pressure is greater than or equal to a second pressure threshold value.

When the second pressure is smaller than the second pressure threshold, the tail gas in the gas heating cavity is not fully heated at the moment, and the control unit controls the second control valve to be closed, so that the tail gas with lower temperature is prevented from flowing into the gas processing device. When the second pressure is increased to be greater than or equal to the second pressure threshold value, the control unit controls the second control valve to be opened, so that the heated tail gas enters the tail gas treatment device through the gas outlet and enters the tail gas treatment device. Because the temperature of tail gas increases for tail gas processing apparatus is higher to the purification efficiency of tail gas, reduces the pollution of tail gas to the environment.

In this disclosed embodiment, because the first control valve is opened when the first pressure in the gas collection cavity is greater than or equal to first pressure threshold for tail gas can concentrate and get into and heat in the gas heating cavity, on the one hand, improves the utilization ratio to the heat source, avoids the wasting of resources, and on the other hand, it is more to avoid the tail gas in the gas heating cavity, makes the heater can't carry out the abundant heating to tail gas, makes the temperature of tail gas lower, has reduced the purification efficiency of tail gas processing apparatus to tail gas. Because the second control valve is opened when the second pressure in the gas heating cavity is greater than or equal to the second pressure threshold value, make tail gas can get into tail gas processing apparatus, guarantee that tail gas can stay a period in the gas heating cavity, and heated, guarantee that tail gas can be fully heated, avoid tail gas not fully heated, the temperature is lower, make tail gas processing apparatus become low to the purification efficiency of tail gas.

Referring again to fig. 3, before step S310, the method further comprises:

in step S308, the engine water temperature is acquired.

In the disclosed embodiment, the control unit is electrically connected to the controller area network bus, so that the control unit can receive the engine water temperature information.

In step S309, the stage of the engine is determined based on the engine water temperature.

In the disclosed embodiment, the control unit judges the stage of the engine according to the engine water temperature information, and when the engine water temperature is less than the temperature threshold value, the cold start stage is indicated, and when the engine water temperature is greater than or equal to the temperature threshold value, the normal operation stage is indicated.

Referring again to fig. 3, the method further comprises:

in step S314, when the engine is in a cold start stage, the heater is controlled to operate, and when the engine is in a normal operation stage, the heater is controlled to stop operating, and both the first control valve and the second control valve are controlled to be opened.

When the temperature of the water of the engine is smaller than the temperature threshold value, the engine is in a cold start stage, which shows that the temperature of the tail gas is lower at the moment, the control unit controls the heater to work to heat the tail gas in the gas heating cavity, and the problem that the purification efficiency of the tail gas treatment device is lower due to the lower temperature of the tail gas is avoided. When the water temperature of the engine is greater than or equal to the temperature threshold value, the temperature of the tail gas is higher, the engine is in a normal operation stage, the tail gas does not need to be heated, the purification efficiency of the tail gas heating device can be ensured, and the control unit controls the heater to stop working at the moment, so that resource waste is avoided. And meanwhile, the first control valve and the second control valve are controlled to be opened, so that tail gas directly enters the tail gas treatment device through the tail gas heating device, namely the tail gas heating device does not work at the moment, and the resource waste is reduced.

Referring again to fig. 3, the method further comprises:

in step S315, the intake air pressure pump is controlled to operate when the engine is in a cold start phase, and the intake air pressure pump is controlled to stop operating when the engine is in a normal operation phase.

When the engine is in a cold start stage, the air suction pressurization pump conveys tail gas from the engine to the tail gas heating device, and the engine is prevented from stalling. When the engine is in a normal operation stage, the tail gas can flow smoothly, and the control unit controls the air suction pressurizing pump to stop working, so that resource waste is avoided.

Embodiments of the present disclosure also provide an automobile including an exhaust gas heating apparatus as shown in fig. 1 or fig. 2.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. An exhaust gas heating device, comprising:

the gas storage box (10) is provided with a gas inlet (101), a gas outlet (102), a gas collecting cavity (103), a gas heating cavity (104) and a partition plate (105), the gas inlet (101) is communicated with the gas collecting cavity (103), the gas outlet (102) is communicated with the gas heating cavity (104), the partition plate (105) is positioned between the gas collecting cavity (103) and the gas heating cavity (104), the gas inlet (101) is communicated with an exhaust port of an engine, and the gas outlet (102) is communicated with a gas inlet of a tail gas treatment device;

a first pressure sensor (20) located within the gas collection cavity (103);

a first control valve (30) positioned on the partition plate (105), wherein the first control valve (30) is used for controlling the communication state of the gas collection cavity (103) and the gas heating cavity (104);

a second pressure sensor (40) located within the gas heating chamber (104);

a second control valve (50) located at the air outlet (102);

a heater (60) located within the gas heating chamber (104);

a control unit (70) configured to control the first control valve (30) to close when a first pressure detected by the first pressure sensor (20) is less than a first pressure threshold value and to control the first control valve (30) to open when the first pressure detected by the first pressure sensor (20) is greater than or equal to the first pressure threshold value, when the engine is in a cold start phase; and controlling the second control valve (50) to be closed when the second pressure detected by the second pressure sensor (40) is less than a second pressure threshold value, and controlling the second control valve (50) to be opened when the second pressure detected by the second pressure sensor (40) is greater than or equal to the second pressure threshold value, wherein the second pressure threshold value is greater than the first pressure threshold value.

2. The exhaust gas heating device of claim 1, wherein the first pressure threshold is between 0.02 and 0.15 megapascals and the second pressure threshold is between 0.2 and 0.4 megapascals.

3. The exhaust gas heating device according to claim 1 or 2, wherein the control unit (70) is further electrically connected to the heater (60) and a controller area network bus, respectively, the control unit (70) is configured to receive engine water temperature information transmitted by the controller area network bus, the engine water temperature information is used for indicating a stage where an engine is located, the engine water temperature information indicates that the engine water temperature is less than a temperature threshold value and indicates that the cold start stage is performed, and the engine water temperature information indicates that the engine water temperature is greater than or equal to the temperature threshold value and indicates that the engine water temperature is in a normal operation stage;

the control unit (70) is further configured to control the heater (60) to operate when the engine is in the cold start phase, control the heater (60) to stop operating when the engine is in the normal operation phase, and control both the first control valve (30) and the second control valve (50) to open.

4. The exhaust gas heating apparatus according to claim 3, further comprising: an inspiratory pressure pump (80), the inspiratory pressure pump (80) being located at the air inlet (101), the inspiratory pressure pump (80) being electrically connected with the control unit (70);

the control unit (70) is also configured to control the suction booster pump (80) to operate when the engine is in the cold start phase, and to control the suction booster pump (80) to stop operating when the engine is in the normal operation phase.

5. The exhaust gas heating device according to claim 3, wherein the temperature threshold is between 85 degrees Celsius and 95 degrees Celsius.

6. The exhaust gas heating device according to claim 1 or 2, wherein the first control valve (30) and the second control valve (50) are both one-way control valves.

7. An exhaust gas heating method for controlling the exhaust gas heating apparatus according to any one of claims 1 to 6, the method comprising:

when the engine is in a cold start stage, acquiring first pressure in a gas collection cavity detected by a first pressure sensor;

controlling a first control valve to close when the first pressure is less than a first pressure threshold; when the first pressure is greater than or equal to the first pressure threshold value, controlling the first control valve to open;

when the engine is in a cold start stage, acquiring second pressure in the gas heating cavity detected by a second pressure sensor;

controlling a second control valve to close when the second pressure is less than a second pressure threshold; and when the second pressure is larger than or equal to the second pressure threshold value, controlling the second control valve to open.

8. The method of heating exhaust gas according to claim 7, further comprising:

acquiring the water temperature of an engine;

stage of judging the described engine according to the described engine water temp;

and when the engine is in a cold start stage, controlling the heater to work, and when the engine is in a normal operation stage, controlling the heater to stop working and controlling the first control valve and the second control valve to be opened.

9. The method of heating exhaust gas according to claim 7, further comprising:

and when the engine is in the cold starting stage, controlling the suction pressurization pump to work, and when the engine is in the normal operation stage, controlling the suction pressurization pump to stop working.

10. An automobile, characterized in that the automobile comprises an exhaust gas heating apparatus according to any one of claims 1 to 6.