Methanol engine cold start heating device and control method thereof

Abstract

The invention discloses a methanol engine cold start heating device which comprises a fuel injector and a high-pressure fuel pipe connected to the fuel injector, a fuel injector heating coil is arranged on the fuel injector and connected to a fuel injector heating controller, a high-pressure fuel pipe heating coil is arranged on the high-pressure fuel pipe and connected to a fuel injector heating controller, and a fuel injector heating coil is arranged on the high-pressure fuel pipe. And the high-pressure oil pipe heating coil is connected to a high-pressure oil pipe heating controller. The invention further provides a control method of the methanol engine cold start heating device, and the control method comprises the steps that relevant temperature conditions are obtained, which condition is met is judged, and the heating step corresponding to the condition is entered. Heating coils are arranged on the high-pressure oil pipe and the oil sprayer at the same time, and it is ensured that the temperature of methanol fuel can be increased in time in the low-temperature environment. When parameters such as the environment temperature and the engine water temperature reach preset conditions, the system can automatically judge whether the heating device needs to be started or not, so that the fuel temperature is rapidly increased, the fuel atomization effect is improved, and the ignition and combustion efficiency is improved.

Description

Technical Field

[0001] The invention relates to a methanol engine cold start heating device and a control method thereof, belonging to the technical field of internal combustion engines. Background Art

[0002] Methanol fuel is a new type of clean fuel made by mixing industrial methanol or fuel methanol with denatured alcohol additives and existing national standard gasoline and diesel (or component oil) in a certain volume (or weight ratio) through strict scientific processes. Methanol fuel can replace gasoline and diesel and is used in various motor vehicles. The latent heat of evaporation of methanol is large, which is 2.5 times that of gasoline. This means that under low temperature conditions, methanol needs to absorb more heat when evaporating, resulting in the use of methanol as an engine fuel. The combustible mixture temperature entering the cylinder is too low, the quality is poor, and ignition is difficult or combustion is slow. In order to improve the cold start effect of the engine, a heating device is usually set on the injector. For example, an automatic heating device for an engine injector disclosed in Chinese patent document CN215486329U wraps a heating pipe around the outside of the injector and heats the injector by electric heating. However, if only a heating device is set on the injector, the temperature of the methanol fuel in the high-pressure oil pipe is still very low under low temperature conditions, and it will still enter the injector at a lower temperature. After the low-temperature fuel enters the injector, although the injector has a heating device, the instantaneous heating effect is limited and the temperature of the fuel cannot be quickly increased, which affects the fuel atomization and combustion efficiency, resulting in poor cold start performance of the engine. On the other hand, heating only on the injector fails to fully utilize the heating time and heating area. Since the injector heating device can only heat the fuel when it reaches the injector, the heating time is short and the fuel temperature increase is limited. If a heating device is also set on the high-pressure oil pipe, the fuel can be preheated during the transportation process, thereby improving the overall heating efficiency. In addition, the injector heating device can only heat the injector part, while the fuel in the high-pressure oil pipe is not heated, resulting in uneven fuel temperature distribution. Uneven heating will cause uneven temperature of the mixed gas entering the cylinder, which will affect the combustion stability and efficiency, and may cause incomplete combustion and unstable engine performance. Summary of the invention

[0003] Therefore, the purpose of the present invention is to overcome the defects in the above-mentioned prior art and provide a methanol engine cold start heating device and a control method thereof, which not only heats the injector but also heats the high-pressure oil pipe connected to the injector.

[0004] In order to achieve the above-mentioned purpose, a methanol engine cold start heating device of the present invention comprises an injector and a high-pressure oil pipe connected to the injector, wherein an injector heating coil is arranged on the injector, and the injector heating coil is connected to the injector heating controller, and a high-pressure oil pipe heating coil is arranged on the high-pressure oil pipe, and the high-pressure oil pipe heating coil is connected to the high-pressure oil pipe heating controller.

[0005] A high-pressure oil pipe outlet temperature sensor is arranged at the outlet position of the high-pressure oil pipe; and an injector outlet temperature sensor is arranged at the outlet position of the injector.

[0006] The present invention also provides a control method for a cold start heating device of a methanol engine, wherein the cold start heating device of the methanol engine comprises a fuel injector and a high-pressure fuel pipe connected to the fuel injector, wherein a fuel injector heating coil is arranged on the fuel injector, wherein the fuel injector heating coil is connected to a fuel injector heating controller, wherein a high-pressure fuel pipe heating coil is arranged on the high-pressure fuel pipe, wherein the high-pressure fuel pipe heating coil is connected to a high-pressure fuel pipe heating controller; wherein a high-pressure fuel pipe outlet temperature sensor is arranged at an outlet position of the high-pressure fuel pipe; wherein an injector outlet temperature sensor is arranged at an outlet position of the fuel injector;

[0007] The control method of the methanol engine cold start heating device comprises the following steps:

[0008] S1, obtain the ambient temperature, the engine water temperature and the temperature collected by the turbine rear temperature sensor, and when the ambient temperature is lower than the preset value T 环境 When the engine water temperature is lower than the preset value T 水温 When the engine is in a cold start state, the process proceeds to step S2;

[0009] In this embodiment, the T 环境 is 0°C to 10°C, preferably 5°C; the T 水温 It is 0°C to 10°C, preferably 60°C.

[0010] S2: When the engine is in a cold start state, determine whether the following conditions are met:

[0011] Condition 1: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ;

[0012] Condition 2: The injector outlet temperature is higher than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ;

[0013] Condition 3: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is higher than the preset value T高压油管 ;

[0014] When condition 1 is met, proceed to step S3;

[0015] When condition 2 is met, proceed to step S4;

[0016] When condition three is met, proceed to step S5;

[0017] Where T 喷油器 is 20°C to 30°C, preferably 25°C; the T 喷油器 The temperature is 15 to 25°C, preferably 20°C.

[0018] S3, turn on the injector heating coil and the high-pressure oil pipe heating coil at the same time, and go to step S6;

[0019] S4, turn on the high-pressure oil pipe heating coil and proceed to step S6;

[0020] S5, turn on the injector heating coil and go to step S6;

[0021] S6, when the injector outlet temperature is higher than the preset value T 喷油器 And the high pressure oil pipe outlet temperature is higher than the preset value T 高压油管 When the heating time exceeds the preset value T 加热 Stop heating.

[0022] By adopting the above technical solution, the methanol engine cold start heating device and control method thereof of the present invention have the following beneficial effects compared with the prior art:

[0023] 1. By setting heating coils on the high-pressure oil pipe and the injector at the same time, and equipping them with temperature sensors and intelligent control systems, the temperature of methanol fuel can be increased in time in a low-temperature environment; when the ambient temperature, engine water temperature and other parameters reach the preset conditions, the system will automatically determine whether to turn on the heating device, thereby quickly increasing the fuel temperature, improving the fuel atomization effect, and improving the ignition and combustion efficiency.

[0024] 2. The fuel temperature is monitored in real time through the high-pressure oil pipe outlet temperature sensor and the injector outlet temperature sensor to ensure that the heating process is accurate and controllable; the system intelligently judges and selects the heating mode (simultaneous heating or separate heating) based on the temperature data fed back by the sensor to ensure heating efficiency and effect and prevent overheating or insufficient heating.

[0025] 3. According to the temperature feedback under different working conditions, the heating strategy is intelligently selected to avoid unnecessary energy waste; under the heating strategies corresponding to conditions one, two and three, the corresponding heating coil is turned on only when necessary to achieve the effect of precise heating, reduce energy consumption and improve the overall energy efficiency of the system.

[0026] 4. Through real-time monitoring and precise control of the high-pressure oil pipe and injector outlet temperature, the fuel is ensured to reach the appropriate temperature before entering the cylinder, thereby improving the stability of the combustion process; the system will automatically stop heating when the fuel temperature reaches the preset value or the heating time exceeds the preset value, preventing overheating from damaging the system and ensuring long-term reliable operation of the engine.

[0027] 5. By optimizing the cold start performance of methanol fuel, the combustion efficiency and power output are improved, and the overall performance of the engine is improved; the high-efficiency heating device and intelligent control method can provide better fuel atomization and combustion conditions during the cold start phase of the engine, thereby improving the engine's power performance and fuel economy.

[0028] In summary, the improved methanol engine cold start heating device and control method thereof achieve higher cold start performance, precise heating process control, energy-saving and efficient operation, a reliable and stable system and improved overall engine performance through synchronous heating and intelligent control of the high-pressure oil pipe and the injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the cold start heating device for a methanol engine of the present invention.

[0030] In the figure: 1. fuel injector; 2. high-pressure fuel pipe; 3. fuel injector heating coil; 4. fuel injector heating controller; 5. high-pressure fuel pipe heating coil; 6. high-pressure fuel pipe heating controller; 7. high-pressure fuel pipe outlet temperature sensor; 8. fuel injector outlet temperature sensor. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, a methanol engine cold start heating device of the present invention comprises an injector 1 and a high-pressure oil pipe 2 connected to the injector 1, an injector heating coil 3 is arranged on the injector 1, and the injector heating coil 3 is connected to an injector heating controller 4, a high-pressure oil pipe heating coil 5 is arranged on the high-pressure oil pipe 2, and the high-pressure oil pipe heating coil 5 is connected to a high-pressure oil pipe heating controller 6. A high-pressure oil pipe outlet temperature sensor 7 is arranged at the outlet position of the high-pressure oil pipe 2; and an injector outlet temperature sensor 8 is arranged at the outlet position of the injector 1.

[0033] The present invention also provides a method for controlling a methanol engine cold start heating device implemented by the methanol engine cold start heating device, comprising the following steps:

[0034] S1, obtain the ambient temperature, the engine water temperature and the temperature collected by the turbine rear temperature sensor, and when the ambient temperature is lower than the preset value T 环境 When the engine water temperature is lower than the preset value T 水温 When the engine is in a cold start state, the process proceeds to step S2;

[0035] In this embodiment, the T 环境 is 0°C to 10°C, preferably 5°C; the T 水温 It is 0°C to 10°C, preferably 60°C.

[0036] S2: When the engine is in a cold start state, determine whether the following conditions are met:

[0037] Condition 1: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ;

[0038] Condition 2: The injector outlet temperature is higher than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ;

[0039] Condition 3: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is higher than the preset value T 高压油管 ;

[0040] When condition 1 is met, proceed to step S3;

[0041] When condition 2 is met, proceed to step S4;

[0042] When condition three is met, proceed to step S5;

[0043] Where T 喷油器 is 20°C to 30°C, preferably 25°C; the T 喷油器 The temperature is 15 to 25°C, preferably 20°C.

[0044] S3, turn on the injector heating coil and the high-pressure oil pipe heating coil at the same time, and go to step S6;

[0045] S4, turn on the high-pressure oil pipe heating coil and proceed to step S6;

[0046] S5, turn on the injector heating coil and go to step S6;

[0047] S6, when the injector outlet temperature is higher than the preset value T 喷油器 And the high pressure oil pipe outlet temperature is higher than the preset value T 高压油管 When the heating time exceeds the preset value T 加热 Stop heating.

[0048] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A methanol engine cold start heating device, characterized in that: It includes a fuel injector and a high-pressure fuel pipe connected to the fuel injector, wherein the fuel injector is provided with a fuel injector heating coil, and the fuel injector heating coil is connected to a fuel injector heating controller, and a high-pressure fuel pipe heating coil is provided on the high-pressure fuel pipe, and the high-pressure fuel pipe heating coil is connected to the high-pressure fuel pipe heating controller.

2. The cold start heating device for a methanol engine according to claim 1, characterized in that: A high-pressure oil pipe outlet temperature sensor is arranged at the outlet position of the high-pressure oil pipe; and an injector outlet temperature sensor is arranged at the outlet position of the injector.

3. A control method for a methanol engine cold start heating device, characterized in that: The cold start heating device of the methanol engine comprises an injector and a high-pressure oil pipe connected to the injector, wherein the injector is provided with an injector heating coil, and the injector heating coil is connected to an injector heating controller, and the high-pressure oil pipe is provided with a high-pressure oil pipe heating coil, and the high-pressure oil pipe heating coil is connected to a high-pressure oil pipe heating controller; a high-pressure oil pipe outlet temperature sensor is provided at the outlet position of the high-pressure oil pipe; and an injector outlet temperature sensor is provided at the outlet position of the injector; The control method of the methanol engine cold start heating device comprises the following steps: S1, obtain the ambient temperature, the engine water temperature and the temperature collected by the turbine rear temperature sensor, and when the ambient temperature is lower than the preset value T 环境 When the engine water temperature is lower than the preset value T 水温 When the engine is in a cold start state, the process proceeds to step S2; S2: When the engine is in a cold start state, determine whether the following conditions are met: Condition 1: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ; Condition 2: The injector outlet temperature is higher than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is lower than the preset value T 高压油管 ; Condition 3: The injector outlet temperature is lower than the preset value T 喷油器 , and the high pressure oil pipe outlet temperature is higher than the preset value T 高压油管 ; When condition 1 is met, proceed to step S3; When condition 2 is met, proceed to step S4; When condition three is met, proceed to step S5; S3, turn on the injector heating coil and the high-pressure oil pipe heating coil at the same time, and go to step S6; S4, turn on the high-pressure oil pipe heating coil and proceed to step S6; S5, turn on the injector heating coil and go to step S6; S6, when the injector outlet temperature is higher than the preset value T 喷油器 And the high pressure oil pipe outlet temperature is higher than the preset value T 高压油管 When the heating time exceeds the preset value T 加热 Stop heating.

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