CN110925078A - Method for increasing engine braking power - Google Patents

Abstract

The invention relates to a method for increasing the braking power of an engine, which is simple and easy to operate; air sent by an air filter pipeline is pressurized and sent by an impeller in the air compressor, so that the air can be pressurized and enter the air cylinder; two waste gas flow channels are arranged through the exhaust turbine, and a valve plate is arranged between the large flow channel and the small flow channel, so that high-pressure gas in the small flow channel can flow into the large flow channel; when the engine is switched from normal operation to braking operation, the opening angle of a valve plate in the turbocharger of the electric control balance valve is adjusted to a certain value, when the valve plate is opened, high-pressure gas in a small flow passage flows into a large flow passage, the rotating speed of the turbocharger is increased, and the air inlet pressure is adjusted to be maximum; when the air inlet pressure is maximum and the engine brakes and works, the air inlet amount in the air cylinder is maximum, so that the negative work done by the compression stroke is increased, and the braking power is effectively increased.

Description

Method for increasing engine braking power

Technical Field

The invention relates to a method for increasing the braking power of an engine.

Background

For heavy-load commercial vehicles for cargo transportation, products with better braking performance need to be provided when the vehicles run in special areas with higher requirements on braking performance, such as mountainous areas, mining areas and the like, and the engine adopting the electric control balance valve turbocharger does not obtain the maximum braking power at present. In the prior art, most of the engine braking functions are realized by different mechanical devices, the actual application of a braking system in a vehicle is not considered, and the optimal braking performance is not obtained.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for increasing the braking power of an engine through adjustment of an electrically controlled balance valve turbocharger.

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

a method of increasing engine braking power comprising the steps of:

A. the air compressor is arranged in the air inlet pipe, the turbine is coaxial with an impeller in the air compressor and can drive the impeller to rotate, and the impeller pumps air sent by an air filter pipeline to enable the air to be pressurized and enter the air cylinder;

B. connecting an exhaust turbine of an electric control balance valve turbocharger with an exhaust pipe, wherein the exhaust turbine is provided with two exhaust gas flow passages, a large flow passage and a small flow passage, three cylinders of exhaust gas in front of an engine enter the large flow passage, three cylinders of exhaust gas in back of the engine enter the small flow passage, and a valve plate is arranged between the large flow passage and the small flow passage, so that high-pressure gas in the small flow passage can flow into the large flow passage;

C. according to the braking power required by the engine, the opening angle of the valve plate is controlled, and the size of the air inlet pressure is adjusted, so that the size of the air inlet amount is adjusted, and the adjustment of the braking power of the engine is realized;

c1, when the engine is switched from normal operation to braking operation, adjusting the opening angle of the valve plate in the electric control balance valve turbocharger according to the positive power calibration data, wherein the braking power is a normal value;

c2, opening a valve plate, enabling high-pressure gas in the small flow passage to flow into the large flow passage, increasing the rotating speed of the supercharger, and adjusting the air inlet pressure to be maximum;

and C3, when the air inlet pressure is maximum and the engine is braked, the air inlet quantity in the cylinder is maximum, so that the negative work done in the compression stroke is increased, and the braking power is increased.

Compared with the prior art, the invention has the beneficial effects that:

the method for increasing the braking power of the engine is simple and easy to operate; air sent by an air filter pipeline is pressurized and sent by an impeller in the air compressor, so that the air can be pressurized and enter the air cylinder; two waste gas flow channels are arranged through the exhaust turbine, and a valve plate is arranged between the large flow channel and the small flow channel, so that high-pressure gas in the small flow channel can flow into the large flow channel; when the engine is switched from normal operation to braking operation, the opening angle of a valve plate in the turbocharger of the electric control balance valve is adjusted to a certain value, when the valve plate is opened, high-pressure gas in a small flow passage flows into a large flow passage, the rotating speed of the turbocharger is increased, and the air inlet pressure is adjusted to be maximum; when the air inlet pressure is maximum and the engine brakes and works, the air inlet amount in the air cylinder is maximum, so that the negative work done by the compression stroke is increased, and the braking power is effectively increased.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic view of the structure of a device used to increase engine braking power.

FIG. 2 is a schematic illustration of increasing engine braking power.

In the figure, 1, an engine 2, an electrically controlled balance valve turbocharger 3, a large flow passage 4, a small flow passage 5 and a valve plate are arranged.

Detailed Description

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

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1, the method of increasing engine braking power is applied to an engine 1 employing an electrically controlled balanced valve turbocharger 2.

The exhaust turbine is driven to rotate by utilizing exhaust energy, the air compressor is arranged in the air inlet pipe, the turbine is coaxial with an impeller in the air compressor and drives the impeller to rotate, and the impeller pumps air sent from an air filter pipeline to enable the air to be pressurized and enter the air cylinder. An exhaust turbine of the electric control balance valve turbocharger 2 is connected with an exhaust pipe, the exhaust turbine is provided with two exhaust gas flow passages, namely a large flow passage 3 and a small flow passage 4, three cylinders of exhaust gas in front of an engine enter the large flow passage 3, three cylinders of exhaust gas in back of the engine enter the small flow passage 4, and a valve plate 5 is arranged between the large flow passage 3 and the small flow passage 4, so that high-pressure gas in the small flow passage 4 can flow into the large flow passage 3. According to the braking power required by the engine, the opening angle of the valve plate 5 is controlled, and the size of the air inlet pressure is adjusted, so that the size of the air inlet amount is adjusted, and the braking power of the engine is adjusted accordingly.

Fig. 2 is a schematic block diagram for increasing the braking power of the engine, when the engine 1 is switched from normal operation to braking operation, the opening angle of the valve plate 5 in the electrically controlled balance valve turbocharger 2 is any position (the position is determined according to positive power calibration data), and the braking power is a conventional value at this time. According to the method for increasing the braking power of the engine, when the normal work of the engine 1 is switched to the braking work, the opening angle of the valve plate 5 in the electric control balance valve turbocharger 2 is adjusted to be a certain value (the value is determined according to the braking power calibration data), when the valve plate is opened, high-pressure gas in the small flow passage 4 flows into the large flow passage 3, the rotating speed of the supercharger is increased, and the air inlet pressure is adjusted to be the maximum. When the air inlet pressure is maximum and the engine brakes, the air inlet quantity in the air cylinder is maximum, so that the negative work done by the compression stroke is increased, and the braking power is increased.

It will be further appreciated by those of skill in the art that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer apparatus, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and apparatus. Whether such functionality is implemented as hardware or device depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (1)

1. A method of increasing engine braking power comprising the steps of:

A. the air compressor is arranged in the air inlet pipe, the turbine is coaxial with an impeller in the air compressor and can drive the impeller to rotate, and the impeller pumps air sent by an air filter pipeline to enable the air to be pressurized and enter the air cylinder;

B. connecting an exhaust turbine of an electric control balance valve turbocharger with an exhaust pipe, wherein the exhaust turbine is provided with two exhaust gas flow passages, a large flow passage and a small flow passage, three cylinders of exhaust gas in front of an engine enter the large flow passage, three cylinders of exhaust gas in back of the engine enter the small flow passage, and a valve plate is arranged between the large flow passage and the small flow passage, so that high-pressure gas in the small flow passage can flow into the large flow passage;

C. according to the braking power required by the engine, the opening angle of the valve plate is controlled, and the size of the air inlet pressure is adjusted, so that the size of the air inlet amount is adjusted, and the adjustment of the braking power of the engine is realized;

c1, when the engine is switched from normal operation to braking operation, adjusting the opening angle of the valve plate in the electric control balance valve turbocharger according to the positive power calibration data, wherein the braking power is a normal value;

c2, opening a valve plate, enabling high-pressure gas in the small flow passage to flow into the large flow passage, increasing the rotating speed of the supercharger, and adjusting the air inlet pressure to be maximum;

and C3, when the air inlet pressure is maximum and the engine is braked, the air inlet quantity in the cylinder is maximum, so that the negative work done in the compression stroke is increased, and the braking power is increased.

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