CN115614147A - Precise load control system for high-power premixed gas engine - Google Patents

Abstract

The utility model provides a high-power mixes accurate control system of load of gas engine in advance, be connected with throttle valve regulating circuit and throttle valve bypass regulating circuit that connect in parallel each other between air cooler gas outlet and air inlet manifold air inlet, and gas engine's load carries out accurate regulation and control through the gas flow of adjusting throttle valve regulating circuit and throttle valve bypass regulating circuit, and gas mixer's gas outlet is connected with the air inlet bypass pipeline who gives vent to anger the end intercommunication and install the air inlet bypass valve with throttle valve regulating circuit. The invention realizes the accurate control of the load of the high-power gas engine under the cooperative control of the throttle valve regulating pipeline and the throttle valve bypass regulating pipeline; and the gas outlet of the gas mixer is connected with a gas inlet bypass pipeline which is communicated with the gas outlet end of the throttle valve adjusting pipeline and is provided with a gas inlet bypass valve, so that the surge of the supercharger caused by the shutdown or the large load change can be effectively avoided, the working environment of the gas inlet bypass valve is improved, and the service life is prolonged.

Description

Precise load control system for high-power premixed gas engine

technical field

The invention belongs to the technical field of gas engine control, and in particular relates to a load precision control system of a high-power premixed gas engine.

Background technique

In order to obtain a higher compression ratio, gas engines often use lightweight turbochargers. When the engine is running, it is usually necessary to use a bypass control valve to adjust the intake pressure of the engine. At present, most domestic gas engines use waste gas bypass control. , that is to remove part of the exhaust gas by bypass, so that it does not enter the light turbocharger to do work, so as to achieve the purpose of a good match between the light turbocharger and the engine.

Gas engine load control mostly adopts a single throttle control, and the throttling effect of the throttle usually affects the thermal efficiency of the engine. For high-power engines, the size of the throttle valve is large, the throttling effect is obvious during the adjustment process, and it is difficult to achieve precise control of the load. The wastegate valve is a high-temperature valve with high cost, and it works in a high-temperature environment for a long time, and the risk of failure increases. In addition, although the wastegate control can directly control the amount of exhaust gas entering the turbine end, it can control the turbine speed to a certain extent to prevent the turbine speed from being too high. The pressure cannot be adjusted in time, which is also an unavoidable shortcoming of the wastegate control. Due to the large size of the throttle valve, the throttling effect is obvious, the impact on the thermal efficiency of the engine is increased, and it is difficult to achieve precise control of the load. Therefore, for the above problems, improvements are necessary.

Contents of the invention

The technical problem solved by the present invention is to provide a precise load control system for a high-power premixed gas engine, by connecting a parallel throttle adjustment pipeline and a throttle between the air cooler outlet and the inlet of the intake manifold The bypass regulating pipeline, under the coordinated control of the throttle regulating pipeline and the throttle bypass regulating pipeline, realizes the precise control of the load of the high-power gas engine; and connects the gas outlet of the gas mixer with the gas outlet of the throttle regulating pipeline The intake bypass pipeline connected to the end and installed with the intake bypass valve can effectively avoid the surge of the supercharger caused by shutdown or large load changes, improve the working environment of the intake bypass valve, and increase the service life .

During engine operation, under low load conditions, the throttle valve and throttle bypass valve are coordinated to control the engine load accurately; under medium and high load conditions, the throttle valve is fully open, and the intake bypass valve controls the engine load to a minimum. Adapt to load requirements.

The technical solution adopted in the present invention: a load precise control system for a high-power premixed gas engine, including an engine cylinder unit, an exhaust manifold connected to the engine cylinder unit, and an intake manifold, the exhaust port of the exhaust manifold and the supercharging The turbine at one end of the supercharger is connected, while the air inlet and outlet of the compressor at the other end of the supercharger are respectively connected with the gas mixer and the air cooler, and the mixed gas pressurized by the compressor of the supercharger enters the air cooler Cooling, the air cooler outlet and the inlet of the intake manifold are connected with a parallel throttle adjustment pipeline and a throttle bypass adjustment pipeline, and the load of the gas engine is adjusted by adjusting the throttle adjustment pipeline and throttle The gas flow of the valve bypass regulating pipeline is precisely regulated, and the gas outlet of the gas mixer is connected with an intake bypass pipeline connected with the outlet end of the throttle regulating pipeline and equipped with an intake bypass valve.

Wherein, a throttle valve for adjusting the intake pressure is installed on the throttle valve adjustment pipeline.

Further, a throttle bypass valve for fine-tuning the engine load is installed on the throttle bypass adjustment pipeline.

Further, the throttle bypass valve, the throttle valve and the intake bypass valve are respectively communicated with the control unit through control lines.

Further, one air inlet of the gas mixer communicates with the gas supply unit, and the filter for filtering air communicates with the other air inlet of the gas mixer.

Advantage of the present invention compared with prior art:

1. In this technical solution, a throttle adjustment pipeline and a throttle bypass adjustment pipeline are connected in parallel between the air cooler outlet and the inlet of the intake manifold, and the throttle adjustment pipeline and the throttle bypass adjustment pipeline are connected in parallel. Under the coordinated control of the regulating pipeline, the precise control of the load of the high-power gas engine is realized;

2. This technical solution connects the gas outlet of the gas mixer with the gas outlet of the throttle adjustment pipeline and installs an intake bypass pipeline with an intake bypass valve, which can effectively avoid shutdown or large load changes. Supercharger surge improves the working environment of the intake bypass valve and prolongs its service life;

3. The structure of this technical solution is simple, and the control is convenient and fast. Under the low load condition of the gas engine, the throttle valve and the throttle bypass valve can realize the precise control of the engine load, while under the high load condition of the gas engine, After the throttle valve is fully opened, the intake bypass valve controls the load of the gas engine to meet the load demand.

Description of drawings

Fig. 1 is a schematic block diagram of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to FIG. 1 in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus. without further restrictions. An element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device comprising said element.

A precise load control system for a high-power premixed gas engine, including an engine cylinder unit 1, an exhaust manifold 2 connected to the engine cylinder unit 1, and an intake manifold 3, the exhaust port of the exhaust manifold 2 and the supercharger 4 The turbine at one end communicates, and the compressor inlet and outlet at the other end of the supercharger 4 communicate with the gas mixer 5 and the air cooler 6, respectively, and between the air outlet of the air cooler 6 and the inlet of the intake manifold 3 The throttle adjustment pipeline 7 and the throttle bypass adjustment pipeline 8 are connected in parallel, and the load of the gas engine is precisely regulated by adjusting the air flow of the throttle adjustment pipeline 7 and the throttle bypass adjustment pipeline 8, The air outlet of the gas mixer 5 is connected with the intake bypass pipeline 9 which communicates with the outlet end of the throttle adjustment pipeline 7 and is equipped with an intake bypass valve 10; Between the air inlet of the intake manifold 3 and the throttle valve adjustment pipeline 7 and the throttle valve bypass adjustment pipeline 8 connected in parallel, under the cooperative control of the throttle valve adjustment pipeline 7 and the throttle valve bypass adjustment pipeline 8, Accurate control of the load of a high-power gas engine is realized; by connecting the gas outlet of the gas mixer 5 to the gas outlet of the throttle adjustment pipeline 7, the intake bypass pipeline 9 is installed with an intake bypass valve 10, which can have Effectively avoid the surge of the supercharger 4 caused by shutdown or large load changes, improve the working environment of the intake bypass valve 10, reduce the failure rate, and increase the service life;

A throttle valve 11 for adjusting the intake pressure is installed on the throttle valve adjustment pipeline 7; specifically, a throttle bypass valve 11 for fine-tuning the engine load is installed on the throttle valve bypass adjustment pipeline 8. The bypass valve 12; specifically, the throttle bypass valve 12, the throttle valve 11 and the intake bypass valve 10 communicate with the control unit 13 through control lines respectively.

Wherein, one air inlet of the gas mixer 5 communicates with the gas supply unit 15 , and the filter 14 for filtering air communicates with the other air inlet of the gas mixer 5 .

During the operation of the gas engine, the gas and air from the gas supply unit 15 are mixed in the gas mixer 5 according to the required air-fuel ratio, and the mixed gas after being supercharged by the compressor of the supercharger 4 enters the air cooler 6 for cooling, and the control The unit 13 adjusts the throttle valve 11 to adjust the intake pressure to realize the load control of the gas engine; under the low-load condition of the gas engine, the throttle valve 11 is independently controlled, and the throttle valve bypass valve 12 is connected to the front and rear ends of the throttle valve 11 to control the load of the gas engine. The gas engine load is fine-tuned to achieve precise control of the gas engine load; when the gas engine is under medium and high load conditions, the throttle valve 11 is fully opened, and the gas engine load is controlled by the intake bypass valve 12 to meet the gas engine load. need.

The technical solution is simple in structure, convenient and quick to control. Under the low-load condition of the gas engine, the coordinated control of the throttle valve and the throttle bypass valve can realize the precise control of the engine load. In the high-load condition of the gas engine, the throttle valve After being fully opened, the load of the gas engine is controlled by the intake bypass valve 10 to meet the load demand.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. Accurate control system of load of high-power premixed gas engine, including engine cylinder unit (1), exhaust manifold (2) and air intake manifold (3) be connected with engine cylinder unit (1), the gas vent of exhaust manifold (2) and the turbine intercommunication of booster (4) one end, and the compressor air inlet and the gas outlet of booster (4) other end communicate with gas mixer (5) and air cooler (6) respectively to the gas mixture after the compressor pressure boost through booster (4) gets into air cooler (6) and cools off in, its characterized in that: be connected with between air cooler (6) gas outlet and air intake manifold (3) air inlet mutual parallelly connected throttle valve regulating circuit (7) and have the engine load and carry out throttle valve bypass regulating circuit (8) of fine adjustment function, and gas engine's load carries out accurate regulation and control through the airflow of adjusting throttle valve regulating circuit (7) and throttle valve bypass regulating circuit (8), the gas outlet of gas mixer (5) is connected with and gives vent to anger end intercommunication and install inlet bypass pipeline (9) of inlet bypass valve (10) with throttle valve regulating circuit (7).

2. The system for accurately controlling the load of a high-power premixed gas engine according to claim 1, wherein: and a throttle valve (11) for adjusting the air inlet pressure is arranged on the throttle valve adjusting pipeline (7).

3. The system for accurately controlling the load of a high-power premixed gas engine according to claim 2, wherein: and a throttle valve bypass valve (12) for finely adjusting the load of the engine is mounted on the throttle valve bypass adjusting pipeline (8).

4. The system for accurately controlling the load of a high-power premixed gas engine according to claim 3, wherein: the throttle valve bypass valve (12), the throttle valve (11) and the intake bypass valve (10) are respectively communicated with a control unit (13) through control lines.

5. The system for accurately controlling the load of a high-power premixed gas engine according to any one of claims 1 to 4, wherein: one air inlet of the gas mixer (5) is communicated with a gas supply unit (15), and a filter (14) for filtering air is communicated with the other air inlet of the gas mixer (5).

Images