阅读说明：本技术 发动机系统和发动机系统的控制方法 (Engine system and control method of engine system ) 是由 孙潇 卫文晋 覃艳 丛聪 秦鹏 于 2019-09-30 设计创作，主要内容包括：本发明涉及发动机技术领域,具体涉及一种发动机系统和发动机系统的控制方法,发动机系统包括凸轮轴、信号盘和激光传感器,信号盘安装于凸轮轴上,信号盘的周边沿周向等间距设置有多个刻度齿和一个检测标记,一个检测标记设置于多个刻度齿之间,一个检测标记与发动机内指定活塞的上止点对应,激光传感器设置于发动机上且与信号盘对应,激光传感器用于检测经过其检测区域的多个刻度齿和一个检测标记。本发明的发动机系统能够通过一个激光传感器检测发动机内活塞的位置以及发动机的转速,降低了发动机的制造成本,降低了发动机发生故障的风险。(The invention relates to the technical field of engines, in particular to an engine system and a control method of the engine system. The engine system can detect the position of the piston in the engine and the rotating speed of the engine through the laser sensor, so that the manufacturing cost of the engine is reduced, and the risk of the engine failure is reduced.)

1. The utility model provides an engine system, its characterized in that, engine system includes camshaft, signal disc and laser sensor, the signal disc install in on the camshaft, the periphery of signal disc is equidistant to be provided with a plurality of scale teeth and a detection mark, a detection mark set up in between a plurality of scale teeth, a detection mark corresponds with the top dead center of appointed piston in the engine, laser sensor set up in on the engine and with the signal disc corresponds, laser sensor is used for detecting through its detection area a plurality of scale teeth with a detection mark.

2. The engine system of claim 1, wherein the one detection mark is one characteristic tooth located between two adjacent scale teeth, and a width of the one characteristic tooth is greater than a width of each of the plurality of scale teeth.

3. The engine system of claim 2, wherein the plurality of scale teeth and the one feature tooth are each raised structures that project outwardly along a perimeter of the signal disc.

4. The engine system according to claim 1, wherein the one detection mark is one detection gap having a prescribed width and located between adjacent two scale teeth.

5. A control method of an engine system, characterized in that the control method of an engine system is implemented according to the engine system of any one of claims 1 to 4, the control method of an engine system comprising the steps of:

acquiring a detection mark signal and a plurality of scale tooth signals detected by a laser sensor;

determining the top dead center of a designated piston in the engine according to the detection mark signal;

and determining the ignition advance angle of the appointed cylinder corresponding to the appointed piston according to the plurality of scale tooth signals.

6. The control method of an engine system according to claim 5, characterized in that the control method of an engine system further comprises the steps of:

determining the position of each piston in the engine according to the detection mark signal and the plurality of scale tooth signals;

and controlling the oil injection time of each cylinder corresponding to each piston according to the position of each piston.

7. The method of controlling an engine system according to claim 6, wherein said determining the position of each piston in the engine based on the detected mark signal and the plurality of scale tooth signals comprises:

determining the number of the scale teeth between the detected scale teeth and the detection marks according to the plurality of scale teeth signals;

and determining the position of each piston in the engine according to the number of the scale teeth.

8. The engine system control method according to claim 6, wherein said acquiring the detection mark signal and the plurality of scale tooth signals detected by the laser sensor comprises:

and storing a comparison table of the number of the scale teeth and the position of each piston in the engine.

9. The control method of an engine system according to claim 5, characterized in that the control method of an engine system further comprises:

determining a rotational speed of the engine based on the plurality of scale tooth signals.

10. The control method of an engine system according to claim 5, characterized in that the control method of an engine system further comprises:

determining a detection mark as a detection initial point, and recording the detection number of a plurality of scale teeth detected in one detection period;

and determining that the plurality of scale teeth signals are normal according to the fact that the detected number is equal to the actual number of the plurality of scale teeth.

Technical Field

The invention relates to the technical field of engines, in particular to an engine system and a control method of the engine system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Disclosure of Invention

The present invention provides an engine system, which aims to solve at least one of the problems in the prior art, and the aim is realized by the following technical scheme:

the invention provides an engine system, which comprises a camshaft, a signal panel and a laser sensor, wherein the signal panel is arranged on the camshaft, a plurality of scale teeth and a detection mark are arranged on the periphery of the signal panel at equal intervals, the detection mark is arranged among the scale teeth, the detection mark corresponds to the upper stop point of a designated piston in the engine, the laser sensor is arranged on the engine and corresponds to the signal panel, and the laser sensor is used for detecting the scale teeth and the detection mark which pass through a detection area of the laser sensor.

According to the invention, the position of the piston in the engine and the rotating speed of the engine are detected by one laser sensor, so that the manufacturing cost of the engine is reduced, the risk of the engine failure is reduced, and the control precision and the response speed of the engine are improved.

Further, one detection mark is one characteristic tooth located between two adjacent scale teeth, and the width of one characteristic tooth is larger than that of each scale tooth in the plurality of scale teeth.

Furthermore, the scale teeth and the characteristic teeth are all protruding structures protruding outwards along the periphery of the signal panel.

Further, one detection mark is one detection gap located between two adjacent scale teeth and having a prescribed width.

The second aspect of the invention also provides a control method of an engine system, the control method of an engine system being implemented according to the engine system of the first aspect of the invention, the control method of an engine system comprising the steps of: acquiring a detection mark signal and a plurality of scale tooth signals detected by a laser sensor; determining the top dead center of a designated piston in the engine according to the detection mark signal; and determining the ignition advance angle of the appointed cylinder corresponding to the appointed piston according to the plurality of scale tooth signals.

Further, the control method of the engine system further includes the steps of: determining the position of each piston in the engine according to the detection mark signal and the plurality of scale tooth signals; and controlling the oil injection time of each cylinder corresponding to each piston according to the position of each piston.

Further, determining the position of each piston in the engine based on the detected mark signal and the plurality of scale tooth signals includes: determining the number of the scale teeth between the detected scale teeth and the detection mark according to the plurality of scale teeth signals; and determining the position of each piston in the engine according to the number of the scale teeth.

Further, before acquiring the detection mark signal and the plurality of scale tooth signals detected by the laser sensor, the method comprises: a look-up table is stored of the number of indexing teeth versus the position of each piston in the engine.

Further, the control method of the engine system further includes: the rotational speed of the engine is determined from the plurality of scale tooth signals.

Further, the control method of the engine system further includes: determining a detection mark as a detection initial point, and recording the detection number of a plurality of scale teeth detected in one detection period; and determining that the plurality of scale teeth signals are normal according to the fact that the detected number is equal to the actual number of the plurality of scale teeth.

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 schematic block diagram of an engine system according to an embodiment of the present invention;

FIG. 2 is a flow chart illustrating a method of controlling an engine system according to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating a method of controlling an engine system according to another embodiment of the present invention;

10, a signal panel; 11. scale teeth; 12. detecting the marker; 20. a laser sensor; 30. an ECU; 40. and a fuel injector.

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.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.

Although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," "third," and "fourth," as well as other numerical terms, when used herein do not imply a sequence or order unless clearly indicated by the context. In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be construed broadly, e.g., as a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

For convenience of description, spatially relative terms, such as "upper", "circumferential", "between", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, according to an embodiment of the present invention, a first aspect of the present invention provides an engine system including a camshaft, a signal panel 10, and a laser sensor 20, wherein the signal panel 10 is mounted on the camshaft, a plurality of scale teeth 11 and a detection mark 12 are disposed at equal intervals on the periphery of the signal panel 10, the detection mark 12 is disposed between the scale teeth 11, the detection mark 12 corresponds to an upper dead center of a designated piston in the engine, the laser sensor 20 is disposed on the engine and corresponds to the signal panel 10, and the laser sensor 20 is configured to detect the scale teeth 11 and the detection mark 12 passing through a detection region thereof.

In the above embodiment, the engine system detects the position of the piston in each cylinder of the engine and the rotation speed of the engine through one laser sensor 20, which not only reduces the manufacturing cost of the engine, but also reduces the risk of sensor failure, and improves the control accuracy and response speed of the engine. Specifically, in the above embodiment, the signal panel 10 is provided with a plurality of scale teeth 11, and the detection mark 12 is provided between the plurality of scale teeth 11 corresponding to the top dead center of the designated piston, the laser sensor 20 detects the rotation speed and the rotation position of the signal panel 10 by detecting the plurality of scale teeth 11 by using the principle of laser diffuse reflection, and determines the operation position of the piston in each cylinder of the engine according to the rotation speed and the rotation position of the signal panel 10, thereby determining the ignition time of each cylinder of the engine and the injection time of the injector 40.

It should be noted that, in the above embodiments, the designated piston may be any piston in the engine, and in the six-cylinder engine as an example, the designated piston may be a piston in a first cylinder, and the engine system of the present invention is capable of determining the positions of the pistons in the remaining cylinders in the engine system according to the position of the designated piston (described in detail below).

With continued reference to fig. 1, according to an embodiment of the present invention, one detection mark 12 is a characteristic tooth located between two adjacent graduation marks 11, and the width of one characteristic tooth is greater than the width of each of the plurality of graduation teeth 11.

In the above embodiment, since the width of the characteristic tooth is greater than the width of each of the plurality of scale teeth 11, when the signal dial 10 is rotated to locate the characteristic tooth in the detection area of the laser sensor 20, the laser sensor 20 transmits the detected characteristic tooth signal to the ECU30 of the engine, and the ECU30 of the engine can determine that the designated piston in the engine is located at the top dead center position based on the characteristic tooth signal and determine the positions of the remaining pistons in the engine based on the number of detected scale teeth 11.

Specifically, the tooth period ratio of two adjacent scale teeth is calculated, and the characteristic tooth is determined according to the fact that the tooth period ratio of the characteristic tooth to the adjacent scale is different from the tooth period ratio of the two adjacent scale teeth.

With continued reference to fig. 1, further, according to an embodiment of the present invention, one of the detection marks 12 is a detection gap having a designated width and located between two adjacent graduation marks 11.

In the above embodiment, the prescribed width of the detection gap is larger than the width of the gap between the other scale teeth 11 of the plurality of scale teeth 11, and therefore, when the signal disc 10 is rotated to position the detection gap in the detection region of the laser sensor 20, the ECU30 of the engine can determine that the prescribed piston in the engine is at the top dead center position, and thereby determine the operating positions of the other pistons in the engine, and thereby control the injection timing of the other pistons.

With continuing reference to fig. 1 and with continuing reference to fig. 2, a second aspect of the present invention also provides a control method of an engine system, the control method of the engine system being implemented according to the engine system of the first aspect of the present invention, the control method of the engine system including the steps of: s10, acquiring a detection mark signal and a plurality of scale tooth signals detected by the laser sensor 20; s12, determining the top dead center of a designated piston in the engine according to the detection mark signal; and S14, determining the ignition advance angle of the appointed cylinder corresponding to the appointed piston according to the scale tooth signals.

In the above embodiment, the engine system detects the position of the piston in each cylinder of the engine and the rotation speed of the engine through one laser sensor 20, which not only reduces the manufacturing cost of the engine, but also reduces the risk of sensor failure, and improves the control accuracy and response speed of the engine. Specifically, in the above embodiment, the plurality of scale teeth 11 are provided at equal intervals around the signal panel 10, the detection mark 12 is provided between the plurality of scale teeth 11 corresponding to the top dead center of the designated piston, the laser sensor 20 detects the rotation speed and the rotation position of the signal panel 10 by detecting the plurality of scale teeth 11 by using the principle of laser diffuse reflection, and determines and calculates the operation position of each cylinder of the engine according to the rotation speed and the rotation position of the signal panel 10, thereby determining the ignition time of each cylinder of the engine and the injection time of the injector 40.

With continued reference to fig. 1 and 2, the method of controlling the engine system according to the embodiment of the present invention further includes the steps of: determining the position of each piston in the engine according to the detection mark signal and the plurality of scale tooth signals; and controlling the oil injection time of each cylinder corresponding to each piston according to the position of each piston.

In the present embodiment, the ECU30 of the engine stores a lookup table of the number of scale teeth 11 and the position of each piston in the engine, and when the plurality of scale teeth 11 and the detection marks 12 on the signal panel 10 pass through the detection area of the laser sensor 20, the ECU30 determines the number of scale teeth between the plurality of scale teeth 11 and the detection marks 12 according to the plurality of scale teeth signals, and determines the position of each piston in the engine by querying the lookup table according to the number of scale teeth.

With continued reference to fig. 1 and 2, a method of controlling an engine system according to an embodiment of the present invention further includes: the rotational speed of the engine is determined from the plurality of tick mark signals.

In this example, the ECU30 of the engine detects a plurality of scale tooth signals on the signal panel 10 by the laser sensor 20, for example, the ECU30 calculates the number of scale teeth passing through the detection area of the laser sensor 20 per unit time, and determines the rotation speed of the engine according to the number of scale teeth passing through the detection area of the laser sensor 20 per unit time.

With continued reference to fig. 1 and 2, a method of controlling an engine system according to an embodiment of the present invention further includes: determining a detection mark as a detection initial point; determining the detection mark 12 as a detection initial point, and recording the detection number of the plurality of scale teeth 11 detected in one detection period; it is determined that the plurality of scale teeth signals are normal based on the detected number being equal to the actual number of the plurality of scale teeth 11.

In this example, counting is started from the preliminarily determined feature teeth, and by using the scale tooth signals of the preset number (i.e., the actual number of the scale teeth), if the detected teeth are confirmed again as the feature teeth, the scale tooth signals and the feature tooth signals are synchronized successfully, and if the feature teeth are confirmed unsuccessfully, the feature teeth are searched again and counted.

To describe the control method of the engine system of the present invention in detail, which is described in detail by the embodiment in fig. 3, the control method of the engine system includes the steps of:

s20, electrifying the T15, and initializing the ECU;

s21, the camshaft signal disc rotates, and the camshaft sensor (namely the laser sensor 20) generates a pulse signal;

s22, the timing processing unit records the time interval of the falling edges of two adjacent pulses as a scale tooth period;

s23, calculating the ratio of adjacent scale tooth periods;

s24, calculating the tooth period ratio of adjacent scale teeth, comparing the tooth period ratio of the scale teeth prestored in the first comparison unit with the tooth period ratio of the characteristic teeth prestored in the second comparison unit, and determining the characteristic teeth according to the comparison result;

s25, determining whether the characteristic tooth is determined for the first time, when the characteristic tooth is determined for the first time, proceeding to step S26, preliminarily positioning the characteristic tooth, then counting from the preliminarily determined characteristic tooth in step S27, step S28, comparing a preset number of scale tooth numbers (i.e., actual number of scale tooth numbers) with the detected number of the plurality of scale teeth by a third comparing unit, if the detected number of the plurality of scale teeth is equal to the actual number of the plurality of scale teeth, it is indicated that the synchronization between the characteristic tooth signal and the scale signal is successful, if the detected number of the plurality of scale teeth is not equal to the actual number of the plurality of scale teeth, returning to step S24, re-searching for the characteristic tooth, further, returning to step S22, and re-determining the tooth period ratio of the scale teeth and the tooth period ratio of the characteristic tooth.

Further, if it is determined in step S25 that the characteristic tooth is not the first time determined, the engine system is determined to be in the normal detection routine, and in this case, the routine proceeds to step S29 to determine the position of the characteristic tooth, determine the engine phase from the detected characteristic tooth signal and the plurality of scale tooth signals, and check the engine phase every operation cycle in step S30.

It should be noted that, the above embodiments only illustrate the technical features of the engine system related to the present invention, and do not represent that the engine system only has the technical features, and the technical features of the engine system not related to the present invention are not described herein.

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.