Efficient methanol engine cold start air inlet heating system and control mode thereof

Abstract

An efficient methanol engine cold start air inlet heating system comprises an air inlet pipe and an electronic throttle body, an air inlet heating device is arranged on the air inlet pipe and comprises an air inlet heating assembly, an air inlet shell and a speed increasing device, and the air inlet heating assembly comprises at least one heating element. The heating element is arranged in the heating fin in a mode beneficial to heat transfer, and the air extracting pump is arranged on the downstream portion of the air inlet heating assembly, so that the hot air flowing efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of internal combustion engine control technology, specifically relating to methanol engine fuel injection combustion technology, and in particular, engine cold start device. Background Technology

[0002] Methanol engines use M100 methanol as fuel, offering better fuel economy and lower carbon emissions compared to gasoline. Furthermore, my country has ample production capacity, leading to widespread attention on methanol-fueled engines in recent years. However, methanol-fueled engines face ignition difficulties at ambient temperatures below 16°C, significantly hindering the widespread adoption of methanol fuel.

[0003] Existing methanol engine cold start devices mainly adopt cylinder block heating, which has problems such as high energy consumption and long preheating time, and cannot meet the product requirements. Summary of the Invention

[0004] The present invention addresses the above-mentioned problems by providing an intake air heating system for cold start of methanol engines that is highly adaptable, efficient, and simple in structure.

[0005] To achieve the above objectives, this invention adopts the following technical solution: a high-efficiency cold-start intake air heating system for a methanol engine and its control method, comprising an intake pipe and an electronic throttle body. An intake air heating device is installed on the intake pipe, comprising an intake air heating assembly, an intake housing, and a speed-increasing device. The intake air heating assembly includes at least one heating element, an insulating base, and heating fins. The heating element is arranged in the heating fins in a manner that facilitates heat transfer. The speed-increasing device is used to improve the efficiency of hot air flow.

[0006] The heating fins are finned, which helps to increase the heating area. The heating element is assembled tightly with the fins of the heating fins and connected by an adhesive thermally conductive adhesive.

[0007] The heating element has an overheat protection function to improve the stability of the device.

[0008] The intake housing includes an intake top shell, a sponge filter element, and an intake bottom shell. The intake top shell and the intake bottom shell are connected by fasteners, and the intake heating assembly is encapsulated within the intake housing. The fastener is a hand-tightening bolt.

[0009] As described above, the intake heating device is installed into the intake duct via a connecting component, which is a mounting gasket. The mounting gasket has mounting holes and a vent, and mounting bolts are tightened through the mounting holes. Air is drawn in through the intake vent, filtered by a sponge filter, and then heated by the heating fins of the intake heating assembly.

[0010] One alternative is that the speed-increasing device is an air pump, which includes an air intake and an exhaust port. The air intake is connected to an air inlet pipe, and the exhaust port is open to the outside atmosphere. After the heating fins heat the air, the air pump operates as needed, drawing the heated air into the air inlet pipe. The air pump is used to improve the hot air filling efficiency within the air inlet pipe.

[0011] The air pump is connected to the intake pipe via a three-way connector and is located downstream of the electronic throttle body near the engine.

[0012] The tee connector is either integrally formed with the air intake pipe or is a joint with a flange face and a bypass hole, the bypass hole being connected to the air pump. The end face of the tee connector that connects to the air intake pipe is provided with a sealing structure.

[0013] Another option is that the speed-increasing device is a fan device, which is arranged at the front end of the intake heating assembly and can be arranged inside the intake duct to reduce the installation volume and improve adaptability.

[0014] Furthermore, the aforementioned high-efficiency methanol engine cold start intake air heating system and its control method include a methanol engine ECU controller, wherein both the heating component and the air pump are controlled by the ECU. Alternatively, the methanol engine ECU controller can control the on / off state of the heating component and the air pump by controlling relays connected to them.

[0015] The aforementioned high-efficiency methanol engine cold start intake air heating system and its control method are implemented through the following control method, the execution steps of which include: S01: The methanol engine ECU reads cylinder temperature sensor data to determine whether to start the intake air heating component for air heating; S02: Increase the electronic throttle opening via the methanol engine ECU to ensure the intake volume of heated air; S03: The air pump is started by the methanol engine ECU to draw air into the intake manifold; S04: The methanol engine ECU reads cylinder temperature sensor data to determine whether to start the electronic fuel pump for methanol injection; S05: The engine reads speed sensor data through the methanol engine ECU to determine whether the start-up was successful, and shuts down the intake heating assembly and the vacuum pump.

[0016] The following technical solutions further limit or optimize this application. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of the intake heating system provided by the present invention.

[0018] Figure 2 This is a second schematic diagram of the intake heating system provided by the present invention.

[0019] Figure 3 This is a cross-sectional view of the installation structure of the intake heating system provided by the present invention.

[0020] Figure 4 This is a schematic diagram of the intake heating system provided by the present invention.

[0021] Figure 5 This is a schematic diagram of the air intake heating assembly provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the control logic of the intake heating component provided by the present invention.

[0023] The labels in the attached diagram are as follows: 1 intake housing, 101 intake top housing, 102 hand screw, 103 sponge filter element, 104 intake bottom housing, 2 intake heating assembly, 201 insulating and heat-insulating base, 202 heating fins, 203 overheat protection heating element, 3 mounting gasket, 4 electronic throttle, 5 vacuum pump mounting gasket, 6 methanol engine, 7 vacuum pump, and 8 fan unit. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this embodiment, please refer to Figure 1 , 3 The intake heating system shown in Figure 4 includes an intake heating device, a mounting gasket 3, a vacuum pump mounting gasket 5, and a vacuum pump 7. The intake heating device comprises an intake housing 1 and an intake heating assembly 2 (e.g., ...). Figure 5 As shown, the intake heating assembly includes an insulated and heat-insulating base 201, heating fins 202, and an overheat protection heating element 203.

[0027] The heating fins 202 are fin-shaped to increase the heating area.

[0028] The overheat protection heating element 203 is disposed in the heating fin 202 and connected by an adhesive thermally conductive adhesive.

[0029] The mounting gasket 3 engages with the limiting rib of the intake bottom shell 104 and is connected to the intake heating assembly 2 by bolts. The mounting gasket 3 is provided with mounting holes and ventilation windows.

[0030] The vacuum pump mounting gasket 5 is connected to the screw of the methanol engine 6 through the positioning hole. The vacuum pump 7 is installed on the vacuum pump mounting gasket 5, with its air inlet connected to the inside of the air inlet pipe of the methanol engine 6 and its air outlet connected to the outside.

[0031] The intake heating assembly 2 is located in the intake housing 1. The intake housing 1 includes an intake top shell 101, a hand-tightening screw 102, a sponge filter element 103, and an intake bottom shell 104. The intake top shell 101 and the intake bottom shell 104 are fixedly connected by the hand-tightening screw 102. The intake bottom shell 104 is connected to the methanol engine electronic throttle valve 4 and the methanol engine intake pipe 5 by a screw through the mounting positioning hole 106. Air is drawn in through the intake window 107, filtered by the sponge filter element 103, and then heated by the heating fins 202 of the intake heating assembly 2. The heated air is then drawn into the intake pipe of the methanol engine 6 by the operation of the air pump 7.

[0032] The intake heating assembly 2 is electrically connected to the relay controlled by the methanol engine ECU.

[0033] The vacuum pump 7 is electrically connected to the relay controlled by the methanol engine 6 ECU.

[0034] like Figure 2 The diagram shown is a second embodiment of the intake heating system provided by the present invention, which includes a fan device 8. The fan device 8 is arranged at the front end of the intake heating component 2 and uses the fan action to drive the heated air into the engine system.

[0035] A second aspect of the present invention provides a control method for an intake air heating system for methanol cold start, comprising the following steps, such as... Figure 6 As shown: S01: The methanol engine ECU reads cylinder temperature sensor data to determine whether to activate the intake air heating component relay for air heating; S02: Increase the electronic throttle opening via the methanol engine ECU to ensure the intake volume of heated air; S03: The air pump is started by the methanol engine ECU to draw air into the intake manifold; S04: The methanol engine ECU reads cylinder temperature sensor data to determine whether to start the electronic fuel pump for methanol injection; S05: The engine reads speed sensor data through the methanol engine ECU to determine whether the start-up was successful, and shuts down the intake heating assembly and the vacuum pump.

[0036] Working principle of the invention: In practical use, this invention is controlled by the electronic control unit (ECU) installed in the methanol engine. The methanol engine ECU measures whether the engine cylinder temperature is lower than a set threshold, sends a start control signal to the intake air heating control system relay, sends a stop pumping signal to the electronic fuel pump, and increases the opening of the electronic throttle. Finally, the vacuum pump draws air into the intake manifold to create a certain negative pressure, drawing in the air heated by the intake air heating system and sending it into the combustion chamber. Finally, the cylinder temperature sensor determines whether the methanol ignition threshold has been reached, and starts the electronic fuel pump to inject methanol. After successful start-up, a shut-off signal is sent to the intake air heating control system relay and the vacuum pump relay.

[0037] The above embodiments are only used to illustrate the essence of the present invention, and do not limit the present invention. Any modifications, simplifications, or substitutions made without departing from the principles of the present invention are included within the protection scope of the present invention.

[0038] The parts not covered in this invention are the same as or can be implemented using existing technologies.

Claims

1. A high-efficiency cold-start intake air heating system for a methanol engine, comprising an intake manifold and an electronic throttle body, characterized in that, An intake heating device is provided on the intake pipe. The intake heating device includes an intake heating assembly, an intake housing, and an acceleration device. The intake heating assembly includes at least one heating element, an insulating and heat-insulating base, and heating fins. The heating element is arranged in the heating fins in a manner that facilitates heat transfer.

2. The high-efficiency methanol engine cold start intake air heating system as described in claim 1, characterized in that, The heating ribs are fin-shaped, and the heating element is assembled in close contact with the fins of the heating ribs.

3. The high-efficiency methanol engine cold start intake air heating system as described in claim 2, characterized in that, The heating element has an overheat protection function to improve the stability of the device.

4. The high-efficiency methanol engine cold start intake air heating system as described in claim 1, characterized in that, The air intake housing includes an air intake top shell, a sponge filter element, and an air intake bottom shell, and the air intake heating assembly is encapsulated inside the air intake housing.

5. The high-efficiency methanol engine cold start intake air heating system as described in claim 1, characterized in that, The speed-increasing device is an air pump, which includes an air intake port and an air exhaust port. The air intake port is connected to the air inlet pipe, and the air exhaust port is connected to the outside atmosphere. The air pump is used to improve the filling efficiency of hot air in the air inlet pipe.

6. The high-efficiency methanol engine cold start intake air heating system as described in claim 5, characterized in that, The air pump is connected to the intake pipe via a three-way connector and is located downstream of the electronic throttle body near the engine.

7. The high-efficiency methanol engine cold start intake air heating system as described in claim 6, characterized in that, The tee connector is either an integrally formed air intake pipe or a joint with a flange face and a bypass hole, the bypass hole being connected to the air pump.

8. The high-efficiency methanol engine cold start intake air heating system as described in claim 1, characterized in that, The speed-up device is a fan.

9. The high-efficiency methanol engine cold start intake air heating system as described in any one of claims 1-8, characterized in that, It includes a methanol engine ECU controller, and the heating assembly and the air pump are both controlled by the ECU.

10. A highly efficient control method for a methanol engine cold start intake air heating system, employing the methanol engine cold start intake air heating system as described in claim 9, characterized in that, The control method includes the following steps: S01: The methanol engine ECU reads cylinder temperature sensor data to determine whether to start the intake air heating component for air heating; S02: Increase the electronic throttle opening via the methanol engine ECU to ensure the intake volume of heated air; S03: The air pump is started by the methanol engine ECU to draw air into the intake manifold; S04: The methanol engine ECU reads cylinder temperature sensor data to determine whether to start the electronic fuel pump for methanol injection; S05: The engine reads speed sensor data through the methanol engine ECU to determine whether the start-up was successful, and shuts down the intake heating assembly and the vacuum pump.

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