阅读说明：本技术 发电用电控发动机的调速特性曲线设计方法 (Speed regulation characteristic curve design method of electric control engine for power generation ) 是由 陈瑞 许云峰 秦飞 杨晓 李吉 匡鹏 于 2021-06-22 设计创作，主要内容包括：本发明提供一种发电用电控发动机的调速特性曲线设计方法,包括调速特性油量MAP的设计方法和外特性油量限制曲线的设计方法,发动机通过调速特性油量MAP和外特性油量限制曲线的共同作用进行油量输出来控制发动机转速；所述调速特性油量MAP的设计方法,包括：调速特性油量MAP,由多条调速曲线构成,调速曲线及调速率根据油门开度、发动机转速设置,各调速曲线按照油门开度自小到大分布,所有调速曲线均无交叉；任一油门开度对应的调速曲线,喷油量均是随发动机转速升高而逐渐减小至零,斜率则均是随着转速的升高而逐渐变陡；任一发动机转速下,随着油门开度的增大,其对应的调速曲线斜率均逐渐变缓。本发明能满足各种不同发电用发动机的调速要求。(The invention provides a speed regulation characteristic curve design method of an electric control engine for power generation, which comprises a speed regulation characteristic oil mass MAP design method and an external characteristic oil mass limiting curve design method, wherein the engine carries out oil mass output to control the rotating speed of the engine through the combined action of the speed regulation characteristic oil mass MAP and the external characteristic oil mass limiting curve; the design method of the speed regulation characteristic oil quantity MAP comprises the following steps: the speed regulation characteristic oil mass MAP is composed of a plurality of speed regulation curves, the speed regulation curves and the speed regulation rate are set according to the opening degree of an accelerator and the rotating speed of an engine, the speed regulation curves are distributed from small to large according to the opening degree of the accelerator, and all the speed regulation curves are not crossed; the oil injection quantity of a speed regulation curve corresponding to any accelerator opening is gradually reduced to zero along with the increase of the rotating speed of the engine, and the slope is gradually steep along with the increase of the rotating speed; at any engine speed, the slope of the corresponding speed regulation curve gradually becomes gentle along with the increase of the opening degree of the accelerator. The invention can meet the speed regulation requirements of various engines for power generation.)

1. A design method of a speed regulation characteristic curve of an electric control engine for power generation is characterized by comprising a design method of a speed regulation characteristic oil mass MAP and a design method of an external characteristic oil mass limiting curve, wherein the engine carries out oil mass output through the combined action of the speed regulation characteristic oil mass MAP and the external characteristic oil mass limiting curve to control the rotating speed of the engine;

the design method of the speed regulation characteristic oil quantity MAP comprises the following steps:

the speed regulation characteristic oil mass MAP is composed of a plurality of speed regulation curves, the speed regulation curves and the speed regulation rate are set according to the opening degree of an accelerator and the rotating speed of an engine, the speed regulation curves are distributed from small to large according to the opening degree of the accelerator, and all the speed regulation curves are not crossed; the oil injection quantity of a speed regulation curve corresponding to any accelerator opening is gradually reduced to zero along with the increase of the rotating speed of the engine, and the slope is gradually steep along with the increase of the rotating speed; at any engine speed, the slope of the corresponding speed regulation curve gradually becomes gentle along with the increase of the opening degree of the accelerator;

the speed regulation characteristic oil quantity MAP defines a low idle speed n according to the rotating speed of the engine from low to high₀Oil mass supporting rotating speed n₁Rated speed n₂Oil quantity maintaining rotation speed n₃External characteristic oil quantity limit curve oil stop point rotating speed n₄Full-throttle speed regulation curve rotating speed n corresponding to overload oil mass point₅Rated working condition speed regulation curve oil-cut rotating speed n₆Full throttle (100% throttle) speed regulation curve oil cut-off speed n_max；

The speed regulation characteristic oil quantity MAP defines the low idle speed limit oil quantity q according to the oil injection quantity from small to large₀Rated working condition oil mass q₁Overload oil mass q₂Rated speed external characteristic limited oil quantity q₃Rated speed full throttle set oil quantity q₄；

The oil mass under each engine rotating speed of the speed-regulating characteristic oil mass MAP of the full-throttle speed-regulating curve is higher than the oil injection mass when the engine operates according to the external characteristic;

the design method of the external characteristic oil mass limit curve comprises the following steps:

the oil injection quantity of each engine at the rotating speed on the external characteristic oil quantity limiting curve is higher than the oil injection quantity of the engine during the external characteristic work, but is lower than the oil injection quantity of the speed regulating curve corresponding to the full accelerator opening in the speed regulating characteristic oil quantity MAP.

2. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 1,

as for the speed regulation characteristic oil amount MAP,

full throttle speed regulation curve oil cut-off speed n_maxAt a rated rotation speed n₂115% -130%;

the oil injection quantity of the minimum value point of the oil injection quantity coordinate axis of the engine is 0mg/cyc, and the maximum value point is the maximum oil quantity q of the low-idle speed full accelerator_maxFor an overload oil quantity q₂110 to 115 percent of;

rated speed full throttle set oil quantity q₄For an overload oil quantity q₂105% -110%;

full-throttle speed regulation curve rotating speed n corresponding to overload oil point₅At a rated rotation speed n₂107 to 115 percent of the total weight of the composition.

3. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 1,

for a full-throttle speed regulation curve in the speed regulation characteristic oil quantity MAP, the oil injection quantity is gradually reduced to zero along with the increase of the rotating speed of the engine, the slope of the curve gradually becomes steep along with the increase of the rotating speed, and the whole full-throttle speed regulation curve is in smooth transition; the speed regulation curves under other accelerator opening degrees are also designed according to the setting rule of the full-accelerator speed regulation curve, but the oil-stopping rotating speed of the corresponding speed regulation curve is gradually reduced as the accelerator opening degree is reduced, and the oil injection quantity corresponding to the engine rotating speed on the speed regulation curve is also gradually reduced.

4. The method of designing a speed-governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 3,

when the speed regulation curves of other accelerator opening degrees are set, the speed regulation curves under different accelerator opening degrees can adopt different speed regulation rates, and the slope of the corresponding speed regulation curve gradually becomes gentle along with the increase of the accelerator opening degree under any engine rotating speed.

5. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 1,

for the speed-regulating characteristic oil quantity MAP, the engine rated working condition speed-regulating curve oil-stopping rotating speed n₆At the rated engine speed n₂110% to 125%; and needs to be higher than the overload oil quantityCorresponding full throttle speed regulation curve speed n₅；

When the speed regulation characteristic oil quantity MAP is set, the corresponding accelerator opening degree is more than or equal to 3% when the engine works in a low idle speed and no load under a heat engine state.

6. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 1,

low idle speed n on the external characteristic oil limit curve₀Corresponding low idle speed limiting oil quantity q₀For rated working condition oil quantity q of engine₁30% -70%;

the rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Is greater than or equal to the overload oil quantity q₂；

The rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Corresponding lower than rated engine speed n₂Oil mass supporting rotation speed n₁At least below the nominal engine speed n₂95% of the oil mass and the oil mass supporting rotational speed n₁And rated speed n₂The oil quantity on the external characteristic oil quantity limit curve between the oil quantity limit curves is not lower than the engine overload oil quantity q₂；

Rated working condition oil quantity q on external characteristic oil quantity limit curve₁Corresponding higher than rated engine speed n₂Oil quantity maintaining rotational speed n₃At least greater than the rated engine speed n₂Higher by 30 r/min;

external characteristic oil mass limiting curve oil-stopping rotating speed n₄Is the engine rated speed n₂105 to 107 percent.

7. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 6,

the rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃For an overload oil quantity q₂103% of the total.

8. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 6,

rated working condition oil quantity q on external characteristic oil quantity limit curve₁Corresponding higher than rated engine speed n₂Oil quantity maintaining rotational speed n₃Rated speed n of engine₂Higher by 30-50 r/min.

9. The method for designing a speed governing characteristic curve of an electrically controlled engine for electric power generation as set forth in claim 1,

and each speed regulating curve in the speed regulating characteristic oil mass MAP and the engine external characteristic oil mass limiting curve are smooth transition curves.

Technical Field

The invention relates to the technical field of internal combustion engines, in particular to a speed regulation characteristic curve design method of an electric control engine for power generation.

Background

For a long time, the engines applied to the field of power generation are mainly mechanical speed-regulating engines and electronic speed-regulating engines; the former adopts a mechanical speed regulating system, has simple form and structure, but has low speed regulating precision, poor stability and transient speed regulating performance and poor operability; although the latter has higher speed regulation precision, the latter needs various circuit combinations, and has complex structure, higher cost and poorer oil consumption.

At present, the power generation engines with the two speed regulation modes cannot meet higher use requirements and emission regulation requirements of users, and the electric control engine is applied to the field of power generation, but the existing electric control engine mainly aims at vehicles, needs to control the rotating speed of the engine through a mechanical accelerator pedal, cannot automatically regulate the speed, cannot be directly used in the field of power generation, and must be developed secondarily.

In order to solve the above problems, it is necessary to design a speed regulation control strategy and a speed regulation characteristic curve suitable for an electric control engine for power generation.

Disclosure of Invention

The invention aims to overcome the defects of the existing speed regulating system of the engine for power generation, provides a speed regulating characteristic curve design method suitable for an electric control engine for power generation, has the characteristics of simple structure and good stability and transient speed regulating performance of the engine, and can meet the speed regulating requirements of various engines for power generation. In order to achieve the technical purpose, the embodiment of the invention adopts the technical scheme that:

the embodiment of the invention provides a speed regulation characteristic curve design method of an electric control engine for power generation, which comprises a design method of a speed regulation characteristic oil mass MAP and a design method of an external characteristic oil mass limiting curve, wherein the engine carries out oil mass output to control the rotating speed of the engine through the combined action of the speed regulation characteristic oil mass MAP and the external characteristic oil mass limiting curve;

the design method of the speed regulation characteristic oil quantity MAP comprises the following steps:

the speed regulation characteristic oil mass MAP is composed of a plurality of speed regulation curves, the speed regulation curves and the speed regulation rate are set according to the opening degree of an accelerator and the rotating speed of an engine, the speed regulation curves are distributed from small to large according to the opening degree of the accelerator, and all the speed regulation curves are not crossed; the oil injection quantity of a speed regulation curve corresponding to any accelerator opening is gradually reduced to zero along with the increase of the rotating speed of the engine, and the slope is gradually steep along with the increase of the rotating speed; at any engine speed, the slope of the corresponding speed regulation curve gradually becomes gentle along with the increase of the opening degree of the accelerator;

the speed regulation characteristic oil quantity MAP defines a low idle speed n according to the rotating speed of the engine from low to high₀Oil mass supporting rotating speed n₁Rated speed n₂Oil quantity maintaining rotation speed n₃External characteristic oil quantity limit curve oil stop point rotating speed n₄Full-throttle speed regulation curve rotating speed n corresponding to overload oil mass point₅Rated working condition speed regulation curve oil-cut rotating speed n₆Full throttle (100% throttle) speed regulation curve oil cut-off speed n_max；

The speed regulation characteristic oil quantity MAP defines the low idle speed limit oil quantity q according to the oil injection quantity from small to large₀Rated working condition oil mass q₁Overload oil mass q₂Rated speed external characteristic limited oil quantity q₃Rated speed full throttle set oil quantity q₄；

The oil mass under each engine rotating speed of the speed-regulating characteristic oil mass MAP of the full-throttle speed-regulating curve is higher than the oil injection mass when the engine operates according to the external characteristic;

the design method of the external characteristic oil mass limit curve comprises the following steps:

the oil injection quantity of each engine at the rotating speed on the external characteristic oil quantity limiting curve is higher than the oil injection quantity of the engine during the external characteristic work, but is lower than the oil injection quantity of the speed regulating curve corresponding to the full accelerator opening in the speed regulating characteristic oil quantity MAP.

Further, with respect to the speed regulation characteristic oil amount MAP,

full throttle speed regulation curve oil cut-off speed n_maxAt a rated rotation speed n₂115% -130%;

the oil injection quantity of the minimum value point of the oil injection quantity coordinate axis of the engine is 0mg/cyc, and the maximum value point is the maximum oil quantity q of the low-idle speed full accelerator_maxFor an overload oil quantity q₂110 to 115 percent of;

rated speed full throttle set oil quantity q₄For an overload oil quantity q₂107% -115%;

full-throttle speed regulation curve rotating speed n corresponding to overload oil point₅At a rated rotation speed n₂104 to 106 percent of the total weight of the composition.

Further, for a full-throttle speed regulation curve in the speed regulation characteristic oil quantity MAP, the oil injection quantity is gradually reduced to zero along with the increase of the rotating speed of the engine, the slope of the curve gradually becomes steep along with the increase of the rotating speed, and the whole full-throttle speed regulation curve is in smooth transition; the speed regulation curves under other accelerator opening degrees are also designed according to the setting rule of the full-accelerator speed regulation curve, but the oil-stopping rotating speed of the corresponding speed regulation curve is gradually reduced as the accelerator opening degree is reduced, and the oil injection quantity corresponding to the engine rotating speed on the speed regulation curve is also gradually reduced.

Furthermore, when setting speed regulation curves of other accelerator opening degrees, the speed regulation curves under different accelerator opening degrees can adopt different speed regulation rates, and the slope of the corresponding speed regulation curve gradually becomes slower along with the increase of the accelerator opening degree under any engine rotating speed.

Further, for the oil mass MAP with speed regulation characteristic, the oil stop speed n of the speed regulation curve of the rated working condition of the engine₆At the rated engine speed n₂110% to 125%; and the rotating speed n is higher than the rotating speed n of the full-throttle speed regulation curve corresponding to the overload oil mass point₅；

When the speed regulation characteristic oil quantity MAP is set, the corresponding accelerator opening degree is more than or equal to 3% when the engine works in a low idle speed and no load under a heat engine state.

Further, on the external characteristic oil amount limit curve, low idle speed n₀Corresponding low idle speed limiting oil quantity q₀For rated working condition oil quantity q of engine₁30% -70%;

the rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Is greater than or equal to the overload oil quantity q₂；

The rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Corresponding lower than rated engine speed n₂Oil mass supporting rotation speed n₁At least below the nominal engine speed n₂95% of the oil mass and the oil mass supporting rotational speed n₁And rated speed n₂The oil quantity on the external characteristic oil quantity limit curve between the oil quantity limit curves is not lower than the engine overload oil quantity q₂；

Rated working condition oil quantity q on external characteristic oil quantity limit curve₁Corresponding higher than rated engine speed n₂Oil quantity maintaining rotational speed n₃At least greater than the rated engine speed n₂Higher by 30 r/min;

further, on the external characteristic oil amount limiting curve, the rated rotation speed external characteristic limiting oil amount q₃For an overload oil quantity q₂103% of the total.

Furthermore, the external characteristic oil quantity limits the rated working condition oil quantity q on the curve₁Corresponding higher than rated engine speed n₂Oil quantity maintaining rotational speed n₃Rated speed n of engine₂Higher by 30-50 r/min.

Further, each speed regulation curve in the speed regulation characteristic oil quantity MAP and the engine external characteristic oil quantity limit curve are curves in smooth transition.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

1) the rotating speed can be controlled by adopting the most appropriate speed regulation rate under different working conditions of the engine, so that the engine has good stability and transient speed regulation performance, the economical efficiency and the emission level of the engine can be improved, and the service life of the engine can be prolonged.

2) The method can meet the requirement of different generator set control modes (constant rotating speed control mode and parallel operation rotating speed fine adjustment control mode) on the adjustment of the fuel injection quantity of the engine, and therefore, the method can be suitable for various different power generation equipment.

3) Can meet the requirement of the highest grade G3 of power generation.

Drawings

Fig. 1 is a schematic diagram of a speed regulation characteristic oil quantity MAP and an external characteristic oil quantity limit curve in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a method for designing a speed regulation characteristic curve of an electric control engine for power generation, which comprises a method for designing a speed regulation characteristic oil mass MAP and a method for designing an external characteristic oil mass limiting curve, wherein the engine carries out oil mass output to control the rotating speed of the engine through the combined action of the speed regulation characteristic oil mass MAP and the external characteristic oil mass limiting curve;

the design method of the speed regulation characteristic oil quantity MAP comprises the following steps:

the speed regulation characteristic oil mass MAP is composed of a plurality of speed regulation curves, the speed regulation curves and the speed regulation rate are set according to the opening degree of an accelerator and the rotating speed of an engine, the speed regulation curves are distributed from small to large according to the opening degree of the accelerator, and all the speed regulation curves are not crossed; the oil injection quantity of a speed regulation curve corresponding to any accelerator opening is gradually reduced to zero along with the increase of the rotating speed of the engine, and the slope is gradually steep along with the increase of the rotating speed; at any engine speed, the slope of the corresponding speed regulation curve gradually becomes gentle along with the increase of the opening degree of the accelerator; therefore, when the rotating speed of the engine is too high, the fuel injection quantity can be quickly reduced to inhibit the rotating speed of the engine from increasing, and when the rotating speed of the engine is reduced, a larger fuel injection quantity can be maintained to prevent the rotating speed of the engine from being reduced too low, so that the stability of the rotating speed of the engine is ensured, and simultaneously, because the fuel injection quantity is slowly changed when the engine is under medium and large loads, the fuel consumption of the engine can be effectively reduced and the emission is improved;

the speed regulation characteristic oil quantity MAP defines a low idle speed n according to the rotating speed of the engine from low to high₀Oil mass supporting rotating speed n₁Rated speed n₂Oil quantity maintaining rotation speed n₃External characteristic oilQuantity limit curve oil stop point rotating speed n₄Full-throttle speed regulation curve rotating speed n corresponding to overload oil mass point₅Rated working condition speed regulation curve oil-cut rotating speed n₆Full throttle (100% throttle) speed regulation curve oil cut-off speed n_max；

The speed regulation characteristic oil quantity MAP defines the low idle speed limit oil quantity q according to the oil injection quantity from small to large₀Rated working condition oil mass q₁Overload oil mass q₂Rated speed external characteristic limited oil quantity q₃Rated speed full throttle set oil quantity q₄；

The oil injection quantity of the full-throttle speed regulation curve at each engine rotating speed is higher than that of the engine during external characteristic work (namely full-load work at each engine rotating speed);

low idle speed n₀Equal to the low idle speed at which the engine operates; full throttle (100% throttle) speed regulation curve oil cut-off speed n_maxPreferably a nominal rotational speed n₂115% -130%;

the oil injection quantity of the minimum value point of the oil injection quantity coordinate axis of the engine is 0mg/cyc, and the maximum value point is the maximum oil quantity q of the low-idle speed full accelerator_maxPreferably an overload oil quantity q₂110 to 115 percent of;

rated speed full throttle set oil quantity q₄Preferably an overload oil quantity q₂105% -110%;

full-throttle speed regulation curve rotating speed n corresponding to overload oil point₅Slightly higher than rated speed n of engine₂Preferably the rated speed n₂107% to 115%, for example 110%;

the full-throttle speed regulation curve in the speed regulation characteristic oil quantity MAP has the oil injection quantity gradually reduced to zero along with the increase of the rotating speed of the engine, the slope gradually becomes steep along with the increase of the rotating speed, and the whole full-throttle speed regulation curve is in smooth transition; the speed regulation curves under other accelerator opening degrees are also designed according to the setting rule of a full-accelerator speed regulation curve, but the oil-stopping rotating speed of the corresponding speed regulation curve is gradually reduced as the accelerator opening degree is reduced, and the oil injection quantity corresponding to the engine rotating speed on the speed regulation curve is also gradually reduced;

when the speed regulation curves of other accelerator opening degrees are set, the speed regulation curves under different accelerator opening degrees can adopt different speed regulation rates, and the slope of the corresponding speed regulation curve gradually becomes slow along with the increase of the accelerator opening degree under any engine rotating speed, so that the oil quantity change speed is not too fast under the condition of large load in the engine, the oil consumption of the engine can be reduced, and the emission can be improved;

for the speed-regulating characteristic oil quantity MAP, the engine rated working condition speed-regulating curve oil-stopping rotating speed n₆At least more than the rated engine speed n₂The rotating speed n of the full-throttle speed regulation curve corresponding to the overload oil mass point is 5 percent larger and is higher than₅Preferably at the engine rated speed n₂110% to 125%;

when the speed regulation characteristic oil mass MAP is set, the corresponding accelerator opening degree is more than or equal to 3% when the engine is in a low idle speed and does not work under load in a heat engine state, so that the low idle speed of the engine caused by the production error of the oil sprayer can be prevented from being always higher than the target low idle speed;

(II) the design method of the external characteristic oil mass limit curve comprises the following steps:

the oil injection quantity of each engine at the rotating speed on the external characteristic oil quantity limiting curve is higher than the oil injection quantity of the engine during the external characteristic work, but is lower than the oil injection quantity of the speed regulating curve corresponding to the full accelerator opening in the speed regulating characteristic oil quantity MAP;

low idle speed n on the external characteristic oil limit curve₀Corresponding low idle speed limiting oil quantity q₀The optimized value is the rated working condition oil quantity q of the engine₁30% -70%;

the rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Is greater than or equal to the overload oil quantity q₂To ensure that the engine can reach the required overload power, the optimized value is the overload oil quantity q₂103% of;

the rated speed is on the external characteristic oil quantity limiting curve, and the external characteristic limiting oil quantity q₃Corresponding lower than rated engine speed n₂Oil mass supporting rotation speed n₁At least below the nominal engine speed n₂95% of the oil mass and the oil mass supporting rotational speed n₁And rated speed n₂The oil quantity on the external characteristic oil quantity limit curve between the oil quantity limit curves is not lower than the engine overload oil quantity q₂The purpose is to ensure that enough oil quantity can be maintained to restrain the reduction of the rotating speed of the engine when the engine is loaded suddenly;

rated working condition oil quantity q on external characteristic oil quantity limit curve₁Corresponding higher than rated engine speed n₂Oil quantity maintaining rotational speed n₃At least greater than the rated engine speed n₂Higher than 30r/min, preferably higher than the rated speed n of the engine₂The oil mass is higher by 30-50 r/min, so that the maximum oil mass requirements of the generator set at different engine rotating speeds in a constant rotating speed operation mode and a parallel operation mode can be met simultaneously;

external characteristic oil mass limiting curve oil-stopping rotating speed n₄Is the engine rated speed n₂105% -107% of the total mass of the engine, so that the transient speed regulation rate of the engine can be ensured not to exceed 10% when the engine is suddenly unloaded;

further, each speed regulation curve in the speed regulation characteristic oil quantity MAP and the engine external characteristic oil quantity limit curve are curves in smooth transition.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.