Air-cooled gas engine waste gas cooling system and method

Abstract

The invention relates to an air-air cooling gas engine exhaust gas cooling system which comprises an EGR cooling module, an exhaust gas inlet control module, an exhaust gas outlet control module, an air inlet control module and a control computer, one side of the EGR cooling module is communicated with the exhaust gas inlet control module, and the other side of the EGR cooling module is communicated with the exhaust gas outlet control module; the air inlet control module is communicated with an air inlet in the EGR cooling module; the waste gas inlet control module, the waste gas outlet control module and the air inlet control module are respectively coupled with the control computer through signal lines in an electric signal mode. The invention further relates to a gas engine waste gas cooling method. The EGR efficiency is improved, the system structure is simplified, and meanwhile the air inlet temperature is accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas engine EGR systems, and in particular to an air-cooled gas engine exhaust gas cooling system and method. Background Art

[0002] As a clean energy source, more and more traditional trucks are powered by gas engines, which require cooled engine exhaust gas for combustion control.

[0003] The defects of the prior art are:

[0004] 1. The traditional coolant cooler used to cool the engine exhaust gas has low cooling efficiency.

[0005] 2. Using traditional coolant coolers to cool engine exhaust will increase the load on the vehicle's intercooler. Summary of the invention

[0006] In view of the above problems, the present invention provides an air-cooled gas engine exhaust cooling system and method, which aims to improve EGR efficiency, simplify the system structure and accurately control the intake air temperature.

[0007] To solve the above problems, the technical solution provided by the present invention is:

[0008] The air-cooled gas engine exhaust cooling system comprises an EGR cooling module, an exhaust gas intake control module, an exhaust gas outlet control module, an air intake control module and a control module, wherein:

[0009] One side of the EGR cooling module is connected to the exhaust gas intake control module, and the other side is connected to the exhaust gas outlet control module; the air intake control module is connected to the air inlet on the EGR cooling module; the exhaust gas intake control module, the exhaust gas outlet control module, and the air intake control module are respectively coupled to the control module electrical signals through signal lines.

[0010] Preferably, the EGR cooling module comprises an EGR cooler; a drain valve for discharging water in the EGR cooler is installed on the EGR cooler; the drain valve is electrically signal-coupled to the control module via the signal line.

[0011] Preferably, the EGR cooler is provided with a one-way air valve for discharging high-temperature air obtained after heat exchange with the exhaust gas in the EGR cooler.

[0012] Preferably, the exhaust gas intake control module comprises an exhaust gas intake pipe, a first temperature sensor and a first pressure sensor, wherein:

[0013] The exhaust gas intake pipe is communicated with the exhaust gas intake port of the EGR cooler; the first temperature sensor and the first pressure sensor are respectively installed on the exhaust gas intake pipe, and are respectively coupled to the control module through the signal line.

[0014] Preferably, the exhaust gas outlet control module comprises an exhaust gas outlet pipe, a second temperature sensor and a second pressure sensor, wherein:

[0015] The exhaust gas outlet pipe is communicated with the exhaust gas outlet port of the EGR cooler; the second temperature sensor and the second pressure sensor are respectively installed on the exhaust gas outlet pipe, and are respectively coupled to the control module through the signal line.

[0016] Preferably, the air intake control module comprises an air filter, an air pump and an air intake pipe, wherein:

[0017] One end of the air filter is connected to the air pump through the air intake pipe, and the other end of the air filter is connected to the air intake port on the EGR cooling module through the air intake pipe.

[0018] Preferably, an air control valve for controlling the flow of air entering the EGR cooler is installed on the air intake pipe between the air filter and the air intake port; the air control valve is electrically signal coupled to the control module via the signal line.

[0019] Preferably, a third temperature sensor and a third pressure sensor are installed on the air intake pipe between the air control valve and the air intake port; the third temperature sensor and the third pressure sensor are electrically signal coupled to the control module through the signal lines, respectively.

[0020] A method for cooling exhaust gas from a gas engine using the air-cooled exhaust gas cooling system for the gas engine comprises the following steps:

[0021] S100. Control the exhaust gas to pass through the exhaust gas intake pipe so that the exhaust gas flows into the EGR cooler; the first temperature sensor on the exhaust gas intake pipe detects the exhaust gas intake temperature, the first pressure sensor detects the exhaust gas intake pressure, and feeds back the signal to the control module;

[0022] S200. The control module determines whether the exhaust gas intake temperature reaches a manually preset exhaust gas intake temperature threshold, and then performs the following operations according to the determination result:

[0023] When the exhaust gas intake temperature does not reach the manually preset exhaust gas intake temperature threshold, the control module controls the air control valve to close;

[0024] When the exhaust gas intake temperature reaches the manually preset exhaust gas intake temperature threshold, executing step S300;

[0025] S300. Control the air control valve to open; control the normal temperature air to pass through the air pump and the air filter so that the normal temperature air flows into the EGR cooler;

[0026] S400. The third temperature sensor on the air intake pipe detects the air intake temperature, and the third pressure sensor detects the air intake pressure, and feeds back the signal to the control module;

[0027] S500. Control the high-temperature exhaust gas to fully exchange heat with the air in the EGR cooler, thereby reducing the exhaust gas temperature and discharging it from the exhaust gas outlet pipe; the second temperature sensor on the exhaust gas outlet pipe detects the exhaust gas outlet temperature, and the second pressure sensor detects the exhaust gas outlet pressure, and feeds back the signal to the control module;

[0028] S600. The control module controls the exhaust gas outlet control target temperature by controlling the air pump and the air control valve to adjust the air intake temperature and the air intake pressure; wherein the exhaust gas outlet control target temperature is expressed as follows:

[0029] T w =(T2×P2+P3×T3) / P1

[0030] Where: T w It is used to characterize the exhaust gas outlet control target temperature; P1 is used to characterize the exhaust gas outlet pressure; T2 is used to characterize the air intake temperature; P2 is used to characterize the air intake pressure; T3 is used to characterize the exhaust gas intake temperature; P3 is used to characterize the exhaust gas intake pressure;

[0031] S700. Determine whether the exhaust gas outlet temperature detected by the second temperature sensor is greater than a manually preset exhaust gas outlet temperature threshold, and then perform the following operations according to the determination result:

[0032] If the exhaust gas outlet temperature is greater than the exhaust gas outlet temperature threshold value preset manually, controlling the air control valve to be fully opened;

[0033] If the exhaust gas outlet temperature is not greater than the manually preset exhaust gas outlet temperature threshold, the air control valve is controlled to be closed.

[0034] Preferably, the exhaust gas inlet temperature threshold is 100°C; the exhaust gas outlet temperature threshold is 100°C.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. Since the present invention cools the air and controls the temperature of the EGR exhaust gas recirculation, the cooling efficiency is improved, thereby improving the efficiency of the EGR.

[0037] 2. Compared with the water-cooled EGR cooler in the prior art, the air cooling system of the present invention has a simple structure, and the closed-loop control can accurately control the intake air temperature, thereby having obvious technical advantages and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an air-cooled gas engine exhaust cooling system according to a specific embodiment of the present invention;

[0039] Figure 2 It is a control logic diagram of a specific embodiment of the present invention.

[0040] Among them: 100. EGR cooling module, 200. exhaust gas intake control module, 300. exhaust gas outlet control module, 400. air intake control module, 500. control module, 110. air intake port, 120. EGR cooler, 130. drain valve, 140. one-way air valve, 150. exhaust gas intake port, 160. exhaust gas outlet port, 210. exhaust gas intake pipe, 220. first temperature sensor, 230. first pressure sensor, 310. exhaust gas outlet pipe, 320. second temperature sensor, 330. second pressure sensor, 410. air filter, 420. air pump, 430. air intake pipe, 440. air control valve, 450. third temperature sensor, 460. third pressure sensor, 510. signal line DETAILED DESCRIPTION

[0041] The present invention is further explained below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0042] like Figure 1 As shown, the air-cooled gas engine exhaust cooling system comprises an EGR cooling module 100, an exhaust gas intake control module 200, an exhaust gas outlet control module 300, an air intake control module 400 and a control module 500, wherein:

[0043] One side of the EGR cooling module 100 is connected to the exhaust gas intake control module 200, and the other side is connected to the exhaust gas outlet control module 300; the air intake control module 400 is connected to the air intake port 110 on the EGR cooling module 100; the exhaust gas intake control module 200, the exhaust gas outlet control module 300, and the air intake control module 400 are respectively electrically coupled to the control module 500 through signal lines 510.

[0044] It should be noted that the EGR cooling module 100 includes an EGR cooler 120 ; a drain valve 130 for draining water from the EGR cooler 120 is installed on the EGR cooler 120 ; the drain valve 130 is electrically signal coupled to the control module 500 via a signal line 510 .

[0045] It should be further explained that the EGR cooler 120 is equipped with a one-way air valve 140 for discharging high-temperature air after heat exchange with the exhaust gas in the EGR cooler 120 .

[0046] It should be noted that the exhaust gas intake control module 200 includes an exhaust gas intake pipe 210, a first temperature sensor 220 and a first pressure sensor 230, wherein:

[0047] The exhaust gas intake pipe 210 is in communication with the exhaust gas intake port 150 of the EGR cooler 120 ; the first temperature sensor 220 and the first pressure sensor 230 are respectively mounted on the exhaust gas intake pipe 210 , and are respectively electrically coupled to the control module 500 via signal lines 510 .

[0048] It should be noted that the exhaust gas outlet control module 300 includes an exhaust gas outlet pipe 310, a second temperature sensor 320 and a second pressure sensor 330, wherein:

[0049] The exhaust gas outlet pipe 310 is in communication with the exhaust gas outlet port 160 of the EGR cooler 120 ; the second temperature sensor 320 and the second pressure sensor 330 are respectively mounted on the exhaust gas outlet pipe 310 , and are respectively electrically coupled to the control module 500 via signal lines 510 .

[0050] It should be noted that the air intake control module 400 includes an air filter 410, an air pump 420 and an air intake pipe 430, wherein:

[0051] One end of the air filter 410 is in communication with the air pump 420 via the air intake pipe 430 , and the other end of the air filter 410 is in communication with the air intake port 110 on the EGR cooling module 100 via the air intake pipe 430 .

[0052] It should be further explained that an air control valve 440 for controlling the flow of air entering the EGR cooler 120 is installed on the air intake pipe 430 between the air filter 410 and the air intake port 110 ; the air control valve 440 is electrically coupled to the control module 500 via a signal line 510 .

[0053] It should be further explained that a third temperature sensor 450 and a third pressure sensor 460 are installed on the air intake pipe 430 between the air control valve 440 and the air intake port 110; the third temperature sensor 450 and the third pressure sensor 460 are electrically coupled to the control module 500 via signal lines 510 respectively.

[0054] like Figure 2 As shown, a method for cooling exhaust gas from a gas engine using an air-cooled exhaust gas cooling system for the gas engine comprises the following steps:

[0055] S100. Control the exhaust gas to pass through the exhaust gas intake pipe 210 so that the exhaust gas flows into the EGR cooler 120; the first temperature sensor 220 on the exhaust gas intake pipe 210 detects the exhaust gas intake temperature, and the first pressure sensor 230 detects the exhaust gas intake pressure, and feeds back the signal to the control module 500.

[0056] S200. The control module 500 determines whether the exhaust gas intake temperature reaches a manually preset exhaust gas intake temperature threshold, and then performs the following operations according to the determination result:

[0057] When the exhaust gas intake temperature does not reach the manually preset exhaust gas intake temperature threshold, the control module 500 controls the air control valve 440 to close.

[0058] When the exhaust gas intake temperature reaches a manually preset exhaust gas intake temperature threshold, step S300 is executed.

[0059] S300. Control the air control valve 440 to open; control the normal temperature air to pass through the air pump 420 and the air filter 410 so that the normal temperature air flows into the EGR cooler 120.

[0060] S400 . The third temperature sensor 450 on the air intake pipe 430 detects the air intake temperature, and the third pressure sensor 460 detects the air intake pressure, and feeds back the signal to the control module 500 .

[0061] S500. Control the high-temperature exhaust gas to fully exchange heat with the air in the EGR cooler 120, and then reduce the exhaust temperature and discharge it from the exhaust gas outlet pipe 310; the second temperature sensor 320 on the exhaust gas outlet pipe 310 detects the exhaust gas outlet temperature, and the second pressure sensor 330 detects the exhaust gas outlet pressure, and feeds back the signal to the control module 500.

[0062] S600. The control module 500 controls the exhaust gas outlet control target temperature by controlling the air pump 420 and the air control valve 440 to adjust the air intake temperature and the air intake pressure; wherein the exhaust gas outlet control target temperature is expressed as Formula 1:

[0063] T w =(T2×P2+P3×T3) / P1 (1)

[0064] Where: T w Used to characterize the exhaust gas outlet control target temperature; P1 is used to characterize the exhaust gas outlet pressure; T2 is used to characterize the air intake temperature; P2 is used to characterize the air intake pressure; T3 is used to characterize the exhaust gas intake temperature; P3 is used to characterize the exhaust gas intake pressure.

[0065] S700. Determine whether the exhaust gas outlet temperature detected by the second temperature sensor 320 is greater than a manually preset exhaust gas outlet temperature threshold, and then perform the following operations according to the determination result:

[0066] If the exhaust gas outlet temperature is greater than the manually preset exhaust gas outlet temperature threshold, the control air control valve 440 is fully opened.

[0067] If the exhaust gas outlet temperature is not greater than the manually preset exhaust gas outlet temperature threshold, the control air control valve 440 is closed.

[0068] In this specific embodiment, the exhaust gas inlet temperature threshold is 100°C; the exhaust gas outlet temperature threshold is 100°C.

[0069] It should be noted that when the exhaust gas outlet temperature is greater than 100°C, the control module 500 controls the air pump 420 to continuously input room temperature air into the EGR cooler 120 to ensure sufficient air flow for cooling the EGR exhaust gas and accurately controlling the exhaust gas temperature.

[0070] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0071] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0072] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0073] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air-cooled gas engine exhaust cooling system, characterized in that: The invention comprises an EGR cooling module (100), an exhaust gas intake control module (200), an exhaust gas outlet control module (300), an air intake control module (400) and a control module (500), wherein: One side of the EGR cooling module (100) is in communication with the exhaust gas intake control module (200), and the other side is in communication with the exhaust gas outlet control module (300); the air intake control module (400) is in communication with the air intake port (110) on the EGR cooling module (100); the exhaust gas intake control module (200), the exhaust gas outlet control module (300), and the air intake control module (400) are respectively electrically signal coupled to the control module (500) via a signal line (510).

2. The air-cooled gas engine exhaust cooling system according to claim 1, characterized in that: The EGR cooling module (100) comprises an EGR cooler (120); a drain valve (130) for draining water from the EGR cooler (120) is installed on the EGR cooler (120); the drain valve (130) is electrically signal-coupled to the control module (500) via the signal line (510).

3. The air-cooled gas engine exhaust cooling system according to claim 2, characterized in that: The EGR cooler (120) is provided with a one-way air valve (140) for discharging high-temperature air after heat exchange with the exhaust gas in the EGR cooler (120).

4. The air-cooled gas engine exhaust cooling system according to claim 3, characterized in that: The exhaust gas intake control module (200) comprises an exhaust gas intake pipe (210), a first temperature sensor (220) and a first pressure sensor (230), wherein: The exhaust gas intake pipe (210) is in communication with the exhaust gas intake port (150) of the EGR cooler (120); the first temperature sensor (220) and the first pressure sensor (230) are respectively mounted on the exhaust gas intake pipe (210), and are respectively electrically signal coupled to the control module (500) via the signal line (510).

5. The air-cooled gas engine exhaust cooling system according to claim 4, characterized in that: The exhaust gas outlet control module (300) comprises an exhaust gas outlet pipe (310), a second temperature sensor (320) and a second pressure sensor (330), wherein: The exhaust gas outlet pipe (310) is in communication with the exhaust gas outlet port (160) of the EGR cooler (120); the second temperature sensor (320) and the second pressure sensor (330) are respectively mounted on the exhaust gas outlet pipe (310), and are respectively electrically signal coupled to the control module (500) via the signal line (510).

6. The air-cooled gas engine exhaust cooling system according to claim 5, characterized in that: The air intake control module (400) comprises an air filter (410), an air pump (420) and an air intake pipe (430), wherein: One end of the air filter (410) is connected to the air pump (420) through the air intake pipe (430), and the other end is connected to the air intake port (110) on the EGR cooling module (100) through the air intake pipe (430).

7. The air-cooled gas engine exhaust cooling system according to claim 6, characterized in that: An air control valve (440) for controlling the flow of air entering the EGR cooler (120) is installed on the air intake pipe (430) between the air filter (410) and the air intake port (110); the air control valve (440) is electrically signal-coupled to the control module (500) via the signal line (510).

8. The air-cooled gas engine exhaust cooling system according to claim 7, characterized in that: A third temperature sensor (450) and a third pressure sensor (460) are installed on the air intake pipe (430) between the air control valve (440) and the air intake port (110); the third temperature sensor (450) and the third pressure sensor (460) are respectively electrically signal coupled to the control module (500) via the signal line (510).

9. A method for cooling exhaust gas from a gas engine using the air-cooled exhaust gas cooling system of claim 8, characterized in that: The following steps are involved: S100. Control the exhaust gas to pass through the exhaust gas intake pipe (210) so that the exhaust gas flows into the EGR cooler (120); the first temperature sensor (220) on the exhaust gas intake pipe (210) detects the exhaust gas intake temperature, and the first pressure sensor (230) detects the exhaust gas intake pressure, and feeds back the signal to the control module (500); S200. The control module (500) determines whether the exhaust gas intake temperature reaches a manually preset exhaust gas intake temperature threshold, and then performs the following operations according to the determination result: When the exhaust gas intake temperature does not reach the manually preset exhaust gas intake temperature threshold, the control module (500) controls the air control valve (440) to close; When the exhaust gas intake temperature reaches the manually preset exhaust gas intake temperature threshold, executing step S300; S300. Control the air control valve (440) to open; control the normal temperature air to pass through the air pump (420) and the air filter (410) so that the normal temperature air flows into the EGR cooler (120); S400. The third temperature sensor (450) on the air intake pipe (430) detects the air intake temperature, and the third pressure sensor (460) detects the air intake pressure, and feeds back the signal to the control module (500); S500. Controlling the high-temperature exhaust gas to fully exchange heat with the air in the EGR cooler (120), thereby reducing the temperature of the exhaust gas and discharging it from the exhaust gas outlet pipe (310); the second temperature sensor (320) on the exhaust gas outlet pipe (310) detects the exhaust gas outlet temperature, and the second pressure sensor (330) detects the exhaust gas outlet pressure, and feeds back the signal to the control module (500); S600. The control module (500) controls the exhaust gas outlet control target temperature by controlling the air pump (420) and the air control valve (440) to adjust the air intake temperature and the air intake pressure; wherein the exhaust gas outlet control target temperature is expressed as follows: T w =(T2×P2+P3×T3) / P1 Where: T w It is used to characterize the exhaust gas outlet control target temperature; P1 is used to characterize the exhaust gas outlet pressure; T2 is used to characterize the air intake temperature; P2 is used to characterize the air intake pressure; T3 is used to characterize the exhaust gas intake temperature; P3 is used to characterize the exhaust gas intake pressure; S700. Determine whether the exhaust gas outlet temperature detected by the second temperature sensor (320) is greater than a manually preset exhaust gas outlet temperature threshold, and then perform the following operations according to the determination result: If the exhaust gas outlet temperature is greater than the manually preset exhaust gas outlet temperature threshold, controlling the air control valve (440) to be fully opened; If the exhaust gas outlet temperature is not greater than the manually preset exhaust gas outlet temperature threshold, the air control valve (440) is controlled to be closed.

10. The method for cooling exhaust gas from a gas engine according to claim 9, characterized in that: The exhaust gas inlet temperature threshold is 100°C; the exhaust gas outlet temperature threshold is 100°C.

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