阅读说明：本技术 一种发动机转速自适应调节方法 (Self-adaptive adjusting method for engine speed ) 是由 许帅 袁文文 李云霞 秦翠萍 徐卫亮 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种发动机转速自适应调节方法,包括如下步骤：根据转速调节旋钮的开度,查找最高转速设定值表,得到相应的最高转速设定值,作为初始设定转速；将发动机输出扭矩滤波,得到滤波后的发动机输出扭矩；根据发动机转速和滤波后的发动机输出扭矩,查找调节梯度系数表,得到调节梯度系数；根据所述调节梯度系数和滤波后的发动机输出扭矩得到转速调节值；根据所述最高转速设定值和转速调节值得到最终的转速设定值。本发明可以动态调整发动机转速,更好的满足匹配应用；可以应用于发电、挖掘机等匹配应用场景,提高产品竞争力产生经济效益。(The invention discloses a self-adaptive adjusting method for the rotating speed of an engine, which comprises the following steps: searching a maximum rotating speed set value table according to the opening degree of the rotating speed adjusting knob to obtain a corresponding maximum rotating speed set value serving as an initial set rotating speed; filtering the output torque of the engine to obtain the filtered output torque of the engine; searching an adjusting gradient coefficient table according to the rotating speed of the engine and the output torque of the engine after filtering to obtain an adjusting gradient coefficient; obtaining a rotating speed regulating value according to the regulating gradient coefficient and the filtered engine output torque; and obtaining a final rotating speed set value according to the maximum rotating speed set value and the rotating speed regulating value. The invention can dynamically adjust the rotating speed of the engine, thereby better meeting the matching application; the method can be applied to matching application scenes of power generation, excavators and the like, and improves product competitiveness to generate economic benefits.)

1. An engine speed self-adaptive adjusting method is characterized by comprising the following steps:

searching a maximum rotating speed set value table according to the opening degree of the rotating speed adjusting knob to obtain a corresponding maximum rotating speed set value serving as an initial set rotating speed;

filtering the output torque of the engine to obtain the filtered output torque of the engine;

searching an adjusting gradient coefficient table according to the rotating speed of the engine and the output torque of the engine after filtering to obtain an adjusting gradient coefficient;

obtaining a rotating speed regulating value according to the regulating gradient coefficient and the filtered engine output torque;

and obtaining a final rotating speed set value according to the maximum rotating speed set value and the rotating speed regulating value.

2. The adaptive engine speed adjustment method according to claim 1, wherein the speed adjustment knob is adjustable by an operator.

3. The adaptive engine speed regulation method according to claim 1, wherein the maximum speed setting table is pre-calibrated.

4. The adaptive engine speed regulation method according to claim 1,

the filtering is realized by a first-order low-pass filter, and the fluctuation and the burr of the output torque of the engine are eliminated.

5. The method for adaptively adjusting the engine speed according to claim 1, wherein the adjustment gradient coefficient table is calibrated in advance.

6. The adaptive engine speed regulation method according to claim 1,

the adjusting gradient coefficient table is a three-dimensional table of engine rotating speed, engine output torque and adjusting gradient coefficients.

7. The adaptive engine speed adjustment method according to any one of claims 1 to 6,

and multiplying the regulating gradient coefficient by the filtered engine output torque to obtain a rotating speed regulating value.

8. The adaptive engine speed adjustment method according to any one of claims 1 to 6,

and reducing the rotating speed regulating value through the highest rotating speed set value to obtain a final rotating speed set value.

9. The adaptive engine speed adjustment method according to any one of claims 1 to 6,

the adjustment gradient coefficient is a constant value or a variable value.

Technical Field

The invention relates to the technical field of engines, in particular to a self-adaptive adjusting method for the rotating speed of an engine.

Background

The conventional engine speed control is to calculate the fuel injection of the engine according to the set speed and the current speed, and the set speed is not changed, but some applications such as an excavator need to dynamically adjust the set speed value of the engine in the process of load change, so that the fuel economy can be improved.

However, the prior art fails to dynamically adjust the engine speed.

Disclosure of Invention

The purpose of the invention is realized by the following technical scheme.

The invention calculates a rotating speed reduction value through the slope of the current load and the demand, and the rotating speed reduction value is superposed on the initial rotating speed set value to obtain a final rotating speed value, thereby carrying out rotating speed control.

According to one aspect of the invention, an engine speed self-adaptive adjusting method is provided, and comprises the following steps: searching a maximum rotating speed set value table according to the opening degree of the rotating speed adjusting knob to obtain a corresponding maximum rotating speed set value serving as an initial set rotating speed; filtering the output torque of the engine to obtain the filtered output torque of the engine; searching an adjusting gradient coefficient table according to the rotating speed of the engine and the output torque of the engine after filtering to obtain an adjusting gradient coefficient; obtaining a rotating speed regulating value according to the regulating gradient coefficient and the filtered engine output torque; and obtaining a final rotating speed set value according to the maximum rotating speed set value and the rotating speed regulating value.

Further, the rotation speed adjusting knob can be adjusted by an operator.

Further, the maximum rotating speed set value table is calibrated in advance.

Further, the filtering is realized by a first-order low-pass filter, and fluctuation and burrs of the output torque of the engine are eliminated.

Further, the adjusting gradient coefficient table is calibrated in advance.

Further, the adjusting gradient coefficient table is a three-dimensional table of engine speed, engine output torque and adjusting gradient coefficient.

Further, the adjusting gradient coefficient is multiplied by the filtered engine output torque to obtain a rotating speed adjusting value.

Further, the final set rotating speed value is obtained by reducing the set rotating speed regulating value through the maximum set rotating speed value.

Further, the adjustment gradient coefficient is a constant value or a variable value.

The invention has the advantages that: the invention can dynamically adjust the rotating speed of the engine, thereby better meeting the matching application; the method can be applied to matching application scenes of power generation, excavators and the like, and improves product competitiveness to generate economic benefits.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a logic diagram for dynamically adjusting engine speed in accordance with the present invention;

FIG. 2 is a flow chart of a method for adaptively adjusting engine speed according to the present invention;

FIG. 3 is a schematic diagram of the present invention showing the speed change under different "adjustment gradient coefficients fac".

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 1 is a logic diagram of dynamically adjusting the engine speed according to the present invention, and as shown in fig. 1, the present invention dynamically adjusts the engine speed according to a certain slope through a load, and the slope is adjusted according to different matching applications, thereby associating the engine speed control with the engine load, calculating different engine speeds under different loads by adjusting the basic set speed and the load feedback coefficient of the engine, and realizing stable control of the engine speed and optimal control of oil consumption and the like under different application scenarios. The "rotation speed set value NSp" is a table CUR for controlling a final set rotation speed value of the engine, a maximum rotation speed set value, a rotation speed adjusting knob R, a maximum rotation speed set value NMaxSp, an engine output torque Trq, an engine output torque TrqFlt, an adjusting gradient coefficient table MAP, an engine rotation speed NEng, an adjusting gradient coefficient fac, and a rotation speed adjusting value NAdap.

As shown in fig. 2, the method for adaptively adjusting the engine speed according to the present invention includes the following steps:

s1, pre-calibrating a table CUR of the maximum rotating speed set value, and calculating the initial set rotating speed NMaxSp of the maximum rotating speed set value through an opening degree table lookup of a rotating speed adjusting knob R. The "rotation speed adjustment knob R" is an opening degree of one knob, and is adjusted by an operator.

S2, filtering the engine output torque Trq by a first-order low-pass filter to eliminate fluctuation and burrs of the engine output torque Trq, wherein the filtered torque is 'engine output torque TrqFlt'.

S3, pre-calibrating a gradient coefficient table 'adjusting gradient coefficient table MAP', wherein the table is a three-dimensional table of engine speed, engine output torque and adjusting gradient coefficient, and the two parameters are input into the adjusting gradient coefficient table MAP according to the 'engine speed NEng' and the 'engine output torque TrqFlt', so as to confirm the needed coefficient 'adjusting gradient coefficient fac'.

S4, multiplying the regulating gradient coefficient fac by the engine output torque TrqFlt to obtain a rotating speed regulating value NAdap. The adjustment gradient coefficient fac essentially represents the number of changes in the rotational speed at a certain torque.

S5, obtaining a final set value of a rotating speed set value NSp by subtracting the rotating speed adjusting value NAdap from the maximum rotating speed set value NMaxSp, and realizing final rotating speed output and oil injection quantity calculation by the rotating speed controller after the rotating speed is set. Because the calibration modes of the "adjustment gradient coefficient table MAP" are different, the output of the adjustment gradient coefficient fac may be a fixed value or a variable value, and matching is performed according to the application requirements of users, so that various matching curves of the following fig. 3 can be obtained.

FIG. 3 is a schematic diagram of the speed change of the present invention under different "adjustment gradient coefficients fac", where the horizontal axis represents the rotational speed and the vertical axis represents the torque; the thick line is an external characteristic curve, and the black thin straight line is the rotation speed set value of the engine under different loads under a fixed value fac 2. The black thin arc is the set value of the engine speed under different loads at variable fac 1.

Through the above embodiment, the present invention has the following advantages: firstly, the engine speed is dynamically adjusted according to the engine load, so that certain special matching and application conditions are better met. Secondly, the regulation rule of the engine speed can be changed at will.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.