An engine dehumidification device and an automobile

Abstract

The present invention belongs to the field of the automotive industry, and discloses an engine dehumidifying device and an automobile using the dehumidifying device. By introducing preheated pressurized air into the engine to discharge the water vapor in the engine cylinder, the dehumidifying effect is achieved, avoiding the loss of power of the storage battery caused by the use of the starter to drive the engine to idle and drain after the engine stalls, and can be applied to various vehicle models using substances containing water in the combustion products such as natural gas, LGP, methanol, ethanol gasoline, etc. as fuels.

Description

Technical Field

[0001] The present invention belongs to the field of the automotive industry, and specifically discloses an engine dehumidifying device and an automobile using the dehumidifying device. Background Art

[0002] When the engine stops for a long time in an environment below 0°C, the humid gas in the cylinder will condense water and freeze on the fuel injector and spark plug, resulting in the engine being unable to cold start. This is more likely to occur in vehicle models using fuels that generate water when burned, such as LNG, CNG, LGP, methanol, and ethanol gasoline.

[0003] For this problem, the common measure adopted by each vehicle manufacturer is: after the engine stops, on the premise of not injecting fuel and igniting, let the starter drive the engine to rotate idly to discharge the humid gas in the cylinder (abbreviated as evacuation) to avoid the occurrence of icing.

[0004] However, when the engine stops and the starter drives the crankshaft - connecting rod - piston mechanism of each cylinder to operate, a large amount of electric energy is consumed. And the battery has a lower efficiency in a low - temperature environment. If a large amount of electric energy is consumed in the evacuation action, the starting voltage may be insufficient due to power shortage during the next start, making it difficult for the engine to cold start.

[0005] Another measure is: using electric heating to melt the ice on the fuel injector.

[0006] The problem with this measure is: it cannot solve the problem of ice formation on the spark plug, that is, it cannot completely solve the problem of difficult cold start. Summary of the Invention

[0007] To solve the problems in the background art, the present invention provides an engine dehumidifying device, and the specific technical solution is as follows:

[0008] An engine dehumidifying device includes a boosting air path communicated with the engine intake pipe between the throttle valve and the intake manifold of the engine, an intake - side solenoid valve for adjusting the opening degree of the intake valves of each cylinder of the engine, and an exhaust - side solenoid valve for adjusting the opening degree of the exhaust valves of each cylinder of the engine. The boosting air path includes a gas source and an air delivery pipeline provided with a stop valve. Both ends of the air delivery pipeline are respectively communicated with the gas source and the engine intake pipe, and a heating device is provided on the air delivery pipeline.

[0009] The boosting air path can effectively discharge the moisture remaining in the engine cylinder to the outside of the cylinder as power, avoiding the occurrence of icing. Since each cylinder of the engine is in a different stroke when the engine stops, resulting in some intake valves or exhaust valves being closed, the provided solenoid valves can open the corresponding cylinder's intake valve or exhaust valve of the engine according to instructions at this time, forming a good air flow channel to facilitate the discharge of moisture.

[0010] Since the directly used gas source is unheated cold air, which is extremely likely to precipitate liquid water and remain in the cylinder after mixing with hot air in the engine cylinder, the boost air path is heated to become hot air and then input into the engine to avoid the above situation.

[0011] This solution avoids the situation where subsequent engine starting is difficult due to a large amount of electrical energy being consumed in the evacuation action, and at the same time eliminates the icing hazards at the fuel injector and the spark plug.

[0012] Preferably, it further includes an exhaust valve provided on the wall of the engine exhaust pipe.

[0013] Setting the exhaust valve to open during dehumidification increases the discharge channel for moisture, which is beneficial to the rapid discharge of moisture.

[0014] Preferably, the heat source of the heating device is resistance wire heating.

[0015] The resistance wire is wrapped around the outer wall of the boost air path, and can quickly and evenly preheat the boost air according to instructions, avoiding the precipitation of moisture after cold air enters the cylinder and mixes with hot moisture.

[0016] Preferably, the heat source of the heating device further includes the waste heat generated by the engine exhaust gas recirculation system.

[0017] Using the waste heat of the exhaust gas dissipated from the water jacket of the cooler in the exhaust gas recirculation system to heat the boost air path is more energy-saving and environmentally friendly.

[0018] Preferably, the gas source is vehicle-mounted compressed air.

[0019] Compared with taking natural air from the surrounding by a fan, the compressed air in the gas cylinder is collected before the engine stops, avoiding energy consumption after shutdown, and the flow rate is regulated by an additional pressure limiting valve to ensure that the compressed gas is fully preheated. In addition, the moisture content of the compressed air is much less than that of atmospheric pressure air, and mixing with atmospheric pressure exhaust gas will dry the exhaust gas, and the water will be taken out of the engine cylinder together during the emission process.

[0020] The present invention also provides an automobile, which includes the above-mentioned engine dehumidification device. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the engine assembly after installing the engine dehumidification device in the embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the engine assembly without installing the engine dehumidification device in the embodiment of the present invention;

[0023] In the figure: 1. Air filter; 2. Supercharger; 3. Intercooler; 4. Throttle valve; 5. Engine; 6. Intake manifold; 7. Intake side solenoid valve; 8. Exhaust side solenoid valve; 9. Exhaust manifold; 10. Bleed-off valve; 11. Engine exhaust pipe; 12. Air source; 13. Heating device; 14. EGR cooler; 15. Shut-off valve; 16. EGR valve. Specific embodiments

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0025] Figure 2 It is a general national VI engine system structure, and the air circulation process is as follows:

[0026] Air enters the system from the air filter 1, passes through the supercharger 2, intercooler 3, throttle valve 4, enters the intake manifold 6 on the engine 5, and then enters the engine cylinders. After combustion, part of the gas passes through the exhaust manifold 9, supercharger 2, and enters the exhaust pipe 11, and finally exits the engine. Another part enters the engine exhaust gas recirculation system (EGR) for recirculation. After releasing part of the heat in the EGR cooler 14, it returns to the intake manifold 6 through the EGR valve 16 and participates in in-cylinder combustion again. Among them, the exhaust side solenoid valve 8 is used for cylinder braking and can ensure that the exhaust valve remains open in all strokes of the engine.

[0027] As Figure 1 shown, in this embodiment, a boosting air path with a heating device 13 is connected in parallel to the engine intake pipe between the throttle valve 4 and the intake manifold 6 of the engine in the above structure. One end of the boosting air path connected to the engine intake pipe is equipped with a shut-off valve 15. The heating device 13 is a medium capable of providing a heat source. In this embodiment, the heating device is fixed near the boosting air path and includes a resistance wire wrapped around the outer wall of the boosting air path. At the same time, the wrapping material of the heating device also absorbs the waste heat released by the EGR cooler 14 in the engine exhaust gas recirculation system; an intake side solenoid valve 7 for adjusting the intake valve opening of each cylinder of the engine is configured, and the exhaust side solenoid valve 8 is also implanted with a program to open the exhaust valves of each cylinder after parking. A bleed-off valve 10 is configured on the exhaust pipe 11 between the exhaust manifold 9 and the supercharger 2.

[0028] After the engine stops, the EGR valve 16 and the throttle valve 4 close. The intake-side solenoid valve 7 and the exhaust-side solenoid valve 8 respectively control the opening of the intake valve and the exhaust valve. The vent valve 10 opens. The air pump inhales fresh air through the air filter 1, pressurizes it and fills the air bottle. The compressed air in the air bottle serves as the air source 12 to supply air to the boost air path. After being preheated by the heating device 13, the gas enters the cylinder of the engine 5 through the intake manifold 6, takes out the humid gas from the engine 5, and is discharged to the atmosphere from the exhaust port of the exhaust pipe 11 and the vent valve 10.

[0029] By installing this engine dehumidification device on a vehicle, dehumidification after the engine stops is achieved, and this vehicle constitutes an automotive embodiment of this specification.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An engine dehumidification device, characterized in that The invention comprises a boosting gas circuit connected to an engine intake pipe between a throttle valve (4) and an intake manifold (6) of an engine (5), an intake-side solenoid valve (7) for adjusting the opening of intake valves of each cylinder of the engine (5), and an exhaust-side solenoid valve (8) for adjusting the opening of exhaust valves of each cylinder of the engine (5). The boosting gas circuit comprises an air source (12) and an air delivery pipeline provided with a stop valve (15), the two ends of the air delivery pipeline being respectively connected to the air source (12) and the engine intake pipe, and the air delivery pipeline being provided with a heating device (13); the exhaust valve (10) being provided on the wall of the engine exhaust pipe (11); the heat source of the heating device (13) is heating by a resistance wire; the heat source of the heating device (13) also comprises waste heat generated by an engine exhaust gas recirculation system; the air source (12) is vehicle-mounted compressed air.

2. An automobile, characterized in that: The invention comprises an engine dehumidification device as claimed in claim 1.

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