Injection method of methanol fuel of methanol engine

Abstract

The invention discloses an injection method for methanol fuel of a methanol engine, which comprises the following steps of: acquiring operating condition parameters of the engine, adjusting methanol injection pressure according to the temperature of an air inlet channel, and executing one of the following instructions: instruction I: when the temperature of the air inlet channel is less than or equal to a limit value, instructing to increase the methanol injection pressure and an injection advance angle; according to the instruction II, when the temperature of the air inlet channel is larger than the limiting value, injection is conducted according to the standard methanol injection pressure and the standard advance angle. The method has the advantages of simplicity in control, methanol vaporization rate, guarantee of nozzle reliability and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of methanol engine, in particular to a methanol fuel injection method for methanol engine. BACKGROUND

[0002] On the one hand, methanol is difficult to form soot emissions due to its high oxygen content, and has characteristics such as high latent heat of vaporization, and has not been reasonably applied in the engine combustion process. On the other hand, the exhaust gas discharged by the traditional engine has a high temperature and a certain pressure, and still has a high work potential, but the waste heat of the engine exhaust gas has not been efficiently utilized. However, the methanol fuel of the existing methanol engine has problems such as low atomization efficiency and difficulty in vaporization.

[0003] The existing patent document CN120667269A discloses a system and control method for improving the cold start performance of a methanol extended-range hybrid system, which solves the technical problem that the existing methanol engine starting method has limited effect on the hot atmosphere of methanol atomization, premixing, and methanol injection ignition success under low temperature conditions. It obtains the real-time ambient temperature, adopts different starting strategies according to the real-time ambient temperature to start the engine, and determines whether the engine starts successfully according to the engine starting success condition, realizes the promotion of methanol atomization, realizes the full premixing of methanol, and improves the hot atmosphere effect of methanol injection point success. The technical idea and technical scheme are different from those of the present application.

[0004] The existing patent document CN120626384A discloses a double-airway double-injection methanol engine intake system and engine, which adopts a multi-point injection scheme of one cylinder equipped with two intake airways, two intake manifolds, and two injection valves. In the actual design process, two small-flow injection valves can be used to replace the traditional one large-flow injection valve, making the control more precise, and meeting the needs of large and small injection amounts. The cost of the small injection valve is also lower, and the methanol injection valve is installed on the intake manifold, making the methanol injection valve farther away from the combustion chamber, increasing the mixing distance of methanol fuel and air, improving the mixing effect of methanol and air, and thereby improving the combustion efficiency and reducing the cost.

[0005] The existing patent document CN120175506A discloses a methanol dual-fuel engine methanol injection control device and method, which adaptively controls the injection parameters of each methanol injector according to engine speed, load, exhaust temperature, and other operating parameters and methanol flow data, to ensure that the engine is always in the initial design state. The scheme described in this patent document is different from that of the present application, and does not provide any inspiration related to the technical concept of the present application.

[0006] The above background information is provided only to aid in understanding the concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0007] The main objective of this invention is to propose a methanol fuel injection method for methanol engines that is simple to control and balances methanol vaporization rate with nozzle reliability.

[0008] Therefore, this invention proposes a method for injecting methanol fuel into a methanol engine.

[0009] Preferably, the present invention may also have the following technical features:

[0010] A method for injecting methanol fuel into a methanol engine, comprising the following steps:

[0011] Obtain engine operating parameters, adjust methanol injection pressure according to intake manifold temperature, and execute one of the following commands:

[0012] Command I: When the intake manifold temperature is less than or equal to the limit, the command increases the methanol injection pressure and the injection advance angle.

[0013] Instruction II: When the intake manifold temperature exceeds the limit, inject methanol at the standard injection pressure and standard advance angle.

[0014] Furthermore, the calibrated intake temperature limit is 60°C.

[0015] Furthermore, the standard methanol injection pressure is 3~5 Bar, and the standard advance angle is 10~30°.

[0016] Furthermore, when executing instruction I, the pressure α is increased based on the standard methanol injection pressure, and the value of α varies with the intake manifold temperature.

[0017] Furthermore, the value of α is: 0 < α ≤ 20%.

[0018] Furthermore, β varies with the intake manifold temperature, and the value of β is: 0 < β ≤ 180°.

[0019] Furthermore, the value of β is: 60<β≤120°.

[0020] The beneficial effects of this invention compared to existing technologies include: when the intake air temperature is higher than the limit, under the premise of ensuring injection volume and vaporization level, injection at the standard methanol injection pressure and standard advance angle can guarantee nozzle reliability. When the intake air temperature is not higher than the limit, increasing the methanol injection pressure and increasing the injection advance angle can extend the methanol vaporization time and improve the methanol vaporization rate. Attached Figure Description

[0021] Figure 1 This is the control flowchart of the present invention. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0023] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0024] like Figure 1 The method for injecting methanol fuel into a methanol engine, as shown, includes the following steps:

[0025] Obtain engine operating parameters, adjust methanol injection pressure according to intake manifold temperature, and execute one of the following commands:

[0026] Command I: When the intake manifold temperature is less than or equal to the limit, the command increases the methanol injection pressure and the injection advance angle.

[0027] Instruction II: When the intake manifold temperature exceeds the limit, inject methanol at the standard injection pressure and standard advance angle.

[0028] The calibrated intake temperature limit is 60℃.

[0029] When executing command I, i.e., when the intake manifold temperature is ≤60℃, the methanol vaporization efficiency is low due to the low intake manifold temperature. The pressure α is increased based on the standard methanol injection pressure. The value of α varies with the intake manifold temperature; the higher the intake manifold temperature, the smaller the value of α. Preferably, the value of α is 0 < α ≤ 20%. Simultaneously, the injection advance angle β is increased. β also varies with the intake manifold temperature; the higher the intake manifold temperature, the smaller the value of β. The preferred value of β is 0 < β ≤ 180°. A further preferred option is 60° < β ≤ 120°, thereby extending the methanol vaporization time and improving the methanol vaporization rate.

[0030] In a more specific implementation example, when the intake duct temperature is 60°C, α=0; when the intake duct temperature is 25°C, α=20%; when the intake duct temperature is 60°C, β=0; when the intake duct temperature is 0°C, β=180°. Preferably, the values ​​of α and β change linearly with increasing temperature, for example, a linear change.

[0031] When executing command II, i.e., when the gas inlet temperature is >60℃, the methanol vaporization efficiency is relatively high. This ensures that the injection volume and vaporization level are maintained while maintaining standard methanol injection pressure and standard advance angle, thus guaranteeing nozzle reliability. Preferably, the standard methanol injection pressure is 3~5 Bar, and the standard advance angle is 10~30°.

[0032] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0033] Although exemplary embodiments of the invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. A method for injecting methanol fuel into a methanol engine, characterized in that: Includes the following steps: Obtain engine operating parameters, adjust methanol injection pressure according to intake manifold temperature, and execute one of the following commands: Command I: When the intake manifold temperature is less than or equal to the limit, the command increases the methanol injection pressure and the injection advance angle. Instruction II: When the intake manifold temperature exceeds the limit, inject methanol at the standard injection pressure and standard advance angle.

2. The methanol fuel injection method for a methanol engine as described in claim 1, characterized in that: The calibrated intake temperature limit is 60℃.

3. The methanol fuel injection method for a methanol engine as described in claim 1, characterized in that: The standard methanol injection pressure is 3~5 Bar, and the standard advance angle is 10~30°.

4. The methanol fuel injection method for a methanol engine as described in claim 3, characterized in that: When executing command I, the pressure α is increased based on the standard methanol injection pressure, and the value of α varies with the intake manifold temperature.

5. The methanol fuel injection method for a methanol engine as described in claim 4, characterized in that: The value of α is: 0 < α ≤ 20%.

6. The methanol fuel injection method for a methanol engine as described in claim 4, characterized in that: The injection advance angle is increased by β. β varies with the intake duct temperature, and the value of β is: 0 < β ≤ 180°.

7. The methanol fuel injection method for a methanol engine as described in claim 6, characterized in that: The value of β is: 60<β≤120°.

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