CN114033560B - Grouping control method of variable valve device of engine and engine - Google Patents
Grouping control method of variable valve device of engine and engine Download PDFInfo
- Publication number
- CN114033560B CN114033560B CN202110915989.9A CN202110915989A CN114033560B CN 114033560 B CN114033560 B CN 114033560B CN 202110915989 A CN202110915989 A CN 202110915989A CN 114033560 B CN114033560 B CN 114033560B
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- Prior art keywords
- variable valve
- engine
- group
- rocker arm
- cam
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0257—Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
- F02D41/0082—Controlling each cylinder individually per groups or banks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention provides a grouping control method of an engine variable valve device, wherein the engine is provided with the variable valve device, the variable valve device is arranged on a rocker arm mechanism or a cam shaft of each cylinder and is controlled by a control element, the variable valve device adopts grouping control, each group is at least two groups, each group is controlled by one control element, each group comprises at least two variable valve devices of cylinders, and the cylinders in each group have adjacent ignition sequences.
Description
Technical Field
The invention relates to a grouping control method of a variable valve device of an engine and the engine, and belongs to the technical field of engines.
Background
Engine variable valve devices are widely used in various engines, and various structures are common, the variable valve devices are usually arranged on a rocker arm mechanism or a cam shaft, a control mode of the variable valve devices is usually electromagnetic valves or other control devices, and sometimes the variable valve devices are controlled in groups, for example, one electromagnetic valve is used for controlling variable valve devices of a plurality of cylinders, so that the in-cylinder brake devices are common in-cylinder brake devices of heavy-duty vehicle engines, and the in-cylinder brake devices also belong to the variable valve devices, and are widely used in the heavy-duty vehicle engines by changing valve lift of the engines to enable the engines to generate braking action. The engine for the heavy-duty vehicle is usually six cylinders, the in-cylinder braking devices are usually arranged on the rocker arms, two electromagnetic valves are generally adopted for grouping control, the most common grouping mode is that the engine is divided into two groups, one group is divided into two groups and three groups, one group is divided into four groups, five groups and six groups, one electromagnetic valve is respectively used for controlling each group, thus the braking power can be graded, when the braking power requirement is smaller, only one group of braking devices is controlled to work, and when the braking power requirement is higher, the two groups of braking devices can be controlled to work simultaneously.
Chinese patent CN110080849a discloses a camshaft and valve driving device for an engine, which is also a variable valve device itself, in which a rocker arm employs a slidable roller, and is provided with a driving device that can switch the rocker arm roller from one cam to the other, thereby achieving two valve lifts. For such switchable roller type rocker arm mechanisms, it is necessary to ensure that both cams are located at a base circle portion when the roller is switched, in order to ensure that a unique camshaft structure is designed, a flange is arranged between the two cams, the flange is arranged at a portion where the two cams have lift, only the two cams are all base circle portions without the flange, the portion without the flange is used as a switching window of the roller, thus a driving device of a plurality of rocker arm rollers can be controlled by adopting one electromagnetic valve, when the first rocker arm roller is located at the switching window, other rocker arm rollers can be blocked by the flange and cannot be switched, and when the other rocker arm rollers enter the switching window along with the rotation of the camshaft, the unique camshaft structure can ensure that the switching of each roller is carried out at the base circle portion, thereby ensuring the reliability of roller switching, and a detailed description can be seen in the patent specification.
However, in the case of the variable valve gear disclosed in CN110080849a, when the rocker arm mechanism is controlled in groups, for example, in the case of a six-cylinder engine, if the rocker arm mechanism is controlled in groups according to the currently commonly used grouping mode, that is, a group of two cylinders and three cylinders, a group of four cylinders and five cylinders and six cylinders, since the firing order of the six-cylinder engine is usually 1-5-3-6-2-4, two cam phase intervals of adjacent firing orders are 60 cam angles, that is, the total interval angle of three cam phases of two cylinders and three cylinders is 240 cam angles, the setting of the flange also requires at least 240 cam angles, the portion (switching window) where the roller can be switched is left with only 120 cam angles, which is a challenge for switching the roller, and the switching speed of the roller is required to be very fast to meet the switching within the defined cam angles, which increases the difficulty of switching.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a grouping control method of a variable valve device of an engine.
A grouping control method of an engine variable valve device, the engine is provided with the variable valve device, the variable valve device is arranged on a rocker arm mechanism or a cam shaft of each cylinder and controlled by a control element, the variable valve device adopts grouping control, the number of the variable valve device is at least two, each group is controlled by one control element, each group comprises variable valve devices of at least two cylinders, and the cylinders in each group have adjacent ignition sequences.
The invention also provides an engine, which adopts the grouping control method of the variable valve device of the engine.
The beneficial effects of the invention are as follows: the grouping control method of the variable valve device of the engine can enable the rocker arm roller of the variable valve device with the switchable roller rocker arm to have larger switching space, reduce the requirement on the switching speed of the roller and better ensure the switching reliability of the roller.
Drawings
The drawings are included to provide a better understanding of the invention, and are used in conjunction with the following detailed description to describe and explain, but are not to be construed as limiting the invention. In the accompanying drawings:
FIG. 1 is a schematic diagram of the connections between the main components and the packet control method according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the relative positions between a camshaft and rocker arm rollers in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of the flange set-up position between cams in a presently common group control mode;
fig. 4 is a schematic view of the flange setting position between cams in the grouping control method according to the present invention.
Detailed Description
The following detailed description of the specific technical solutions adopted in the embodiments of the present invention will be given in detail and fully with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of the connection between the main components and the grouping control method according to an embodiment of the invention, in which ECU (Electronic Control Unit) represents a control unit of an engine with a variable valve device arranged on the rocker mechanism or the camshaft of each cylinder, in this embodiment on the rocker arm, which is a rocker arm with a roller follower, in particular in the form of a switchable roller, on the camshaft of which two different cams are arranged, the rollers of which can slide in the axial direction and are driven by a driving device, so that the rocker roller can be switched from one cam to the other, thus achieving two valve lifts. In addition, in order to ensure that two cams are positioned at the base circle part during roller switching, the cam shaft is provided with flanges between the two cams, the flanges are arranged at the parts with lift of the two cams, only the two cams are not provided with flanges at the base circle part, and the part without flanges is used as a switching window of the roller, so that a solenoid valve can be adopted to control a driving device of a plurality of rocker arm rollers, when the first rocker arm roller is positioned at the switching window, other rocker arm rollers can be blocked by the flanges and cannot be switched, and the switching of each roller can be smoothly performed when the other rocker arm rollers enter the switching window along with the rotation of the cam shaft, so that the reliability of roller switching is ensured, and the variable valve device described in the embodiment is the same as the cam shaft and the valve driving device of the engine disclosed in China patent CN110080849A, and the detailed description of the working principle and the process can be seen in the patent specification.
As shown in fig. 1, in this embodiment, the variable valve devices (i.e., rocker arms) are controlled in groups, and the groups are at least divided into two groups, each group is controlled by a control element, and each group has at least two variable valve devices of cylinders, and the cylinders in each group have adjacent firing sequences. In this embodiment, a six-cylinder engine is taken as an example, each cylinder is provided with a rocker arm with a variable valve function, and the rocker arms of the 6 cylinders are controlled in two groups, one group of each 3 cylinders, unlike the current common grouping mode, the two groups of cylinders in this embodiment are respectively one, two, four cylinders and three, five and six cylinders, and the rocker arms of each group of cylinders are respectively controlled by a control element, as shown in fig. 1. Since the firing order of a six-cylinder engine is typically 1-5-3-6-2-4, the group control is characterized in that the cylinders in each group have adjacent firing orders, and likewise, when the cylinders in the two groups are respectively one, three, five and two, four, six or respectively one, four, five and two, three, six cylinders, the cylinders in each group also have adjacent firing orders.
In this embodiment, the rocker arm with the variable valve function is directly driven by the camshaft, for the roller rocker arm directly driven by the camshaft, the angle position of the cam of each cylinder relative to the roller has different included angles according to the ignition sequence, for a six-cylinder engine with the ignition sequence of 1-5-3-6-2-4, for convenience of understanding, the angle position of the roller of each cylinder relative to the cam of the cylinder can be embodied on the cam of a certain cylinder, as shown in fig. 2, the included angle between the rocker arm rollers of each adjacent ignition sequence is 60-degree cam angle, and the rocker arm rollers of each cylinder can be sequentially driven according to the ignition sequence when the camshaft rotates. In the variable valve driving device disclosed in CN110080849a, when a driving device for controlling a plurality of rocker arm rollers by using one solenoid valve is used as an example, in order to ensure that each rocker arm roller is switched between the base circle portion, a flange needs to be provided between two cams to block the roller which does not enter the switching window portion for switching, if a grouping mode which is currently commonly used, i.e., a group of two cylinders and three cylinders and a group of four and five cylinders, is used, a flange needs to be provided between the position of the first cylinder roller relative to the cam and the position of the third cylinder roller relative to the cam along the rotation direction of the cam shaft to block the rocker arm roller of two cylinders which are in the group and are in post ignition (when the first cylinder is used as the first cylinder, i.e., the third cylinder and the second cylinder) from switching, as shown in fig. 3, since the included angle between the position of the first cylinder roller relative to the cam and the position of the third cylinder roller relative to the cam along the rotation direction of the cam is 240 cam angle, the flange also needs to be provided with at least 240 cam angle, and the portion (switching window angle) which is left for switching the roller can be switched by 120 degrees. Similarly, for the other set (four five six cylinders), the flange arrangement also requires at least 240 cam angle degrees. When the grouping control method according to the present invention is adopted, the two cylinders in the present embodiment are respectively one, two, four cylinders and three, five and six cylinders, and according to the above-mentioned flange setting requirement, it is necessary to set the flange between the position of the second cylinder roller opposite to the cam and the position of the first cylinder roller opposite to the cam in the rotation direction of the cam shaft to block the rocker arm roller of the two cylinders in the grouping (the first cylinder is the fourth cylinder when the second cylinder is the first ignition), and as shown in fig. 4, since the three cylinders in the grouping have adjacent ignition sequences, the included angle between the position of the second cylinder roller opposite to the cam and the position of the first cylinder roller opposite to the cam in the rotation direction of the cam shaft is 120 degrees of cam angle, so the flange setting only needs 120 degrees of cam angle, and the part (switching window) reserved for the roller to be switchable has 240 degrees of cam angle. Similarly, only 120 cam angles are required for the arrangement of the other set of (three, five and six cylinder) flanges. Therefore, when the grouping control method of the invention is adopted, for the cam shaft of the variable valve driving device disclosed in CN110080849A, the part between the two cams, where the flange is required to be arranged, has the smallest angle space, and the part (switching window) reserved for the roller to be switched has the largest angle space, so that the reliability of roller switching is fully ensured. Similarly, when the grouping control method provided by the invention is used for grouping with different numbers (such as grouping three groups of two cylinders for a six-cylinder machine), the grouping control method has the advantages.
It is apparent that, not only for the variable valve driving device disclosed in CN110080849a, for variable valve devices of other structural forms designed according to the principle described in CN110080849a, the group control method of the variable valve device according to the present invention is advantageous for the variable valve device to have the largest switching space, and for the variable valve device to operate more reliably.
The invention also provides an engine, which adopts the grouping control method of the variable valve device of the engine.
It should be noted that the foregoing embodiments are merely preferred embodiments for illustrating the design and principles of the present invention, and are not to be construed as limiting the invention, and those skilled in the art to which the present invention pertains may still further modify the technical scheme described in the foregoing embodiments or replace and combine some of the technical features without departing from the spirit of the present invention, and these should be regarded as the scope of the present invention.
Claims (2)
1. The grouping control method of the variable valve gear of the engine, the said engine is provided with the variable valve gear, the said variable valve gear is switchable roller type, there are two different cams on the camshaft of the said engine, the gyro wheel of the rocker arm can slide axially, and drive through the actuating device, make the gyro wheel of the rocker arm can switch over from one cam to another cam, the said camshaft has flanges between two cams, the said flange is used for guaranteeing the switching of the gyro wheel of the rocker arm is carried on in the cam base circle part, the said variable valve gear is controlled by the control element, characterized by: the variable valve device adopts grouping control, the grouping is at least two groups, each group is controlled by a control element, each group comprises at least two variable valve devices of air cylinders, and the air cylinders in each group have adjacent ignition sequences.
2. An engine, characterized in that: the engine employs the group control method of the engine variable valve device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915989.9A CN114033560B (en) | 2021-08-02 | 2021-08-02 | Grouping control method of variable valve device of engine and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915989.9A CN114033560B (en) | 2021-08-02 | 2021-08-02 | Grouping control method of variable valve device of engine and engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114033560A CN114033560A (en) | 2022-02-11 |
| CN114033560B true CN114033560B (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110915989.9A Active CN114033560B (en) | 2021-08-02 | 2021-08-02 | Grouping control method of variable valve device of engine and engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004251200A (en) * | 2003-02-20 | 2004-09-09 | Nissan Motor Co Ltd | Variable valve system device for internal combustion engine |
| CN103201466A (en) * | 2010-11-08 | 2013-07-10 | 丰田自动车株式会社 | Variable valve device for internal combustion engine |
| CN104358600A (en) * | 2014-11-10 | 2015-02-18 | 上海尤顺汽车部件有限公司 | Engine valve motion conversion device |
| CN107035450A (en) * | 2015-10-16 | 2017-08-11 | 现代自动车株式会社 | Changeable air valve opens duration/variable valve lift system and engine |
| CN110080849A (en) * | 2019-05-21 | 2019-08-02 | 姬腾飞 | The camshaft and valve actuator of engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11181013B2 (en) * | 2009-07-22 | 2021-11-23 | Eaton Intelligent Power Limited | Cylinder head arrangement for variable valve actuation rocker arm assemblies |
| JP6384389B2 (en) * | 2015-04-02 | 2018-09-05 | アイシン精機株式会社 | Internal combustion engine control unit |
-
2021
- 2021-08-02 CN CN202110915989.9A patent/CN114033560B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004251200A (en) * | 2003-02-20 | 2004-09-09 | Nissan Motor Co Ltd | Variable valve system device for internal combustion engine |
| CN103201466A (en) * | 2010-11-08 | 2013-07-10 | 丰田自动车株式会社 | Variable valve device for internal combustion engine |
| CN104358600A (en) * | 2014-11-10 | 2015-02-18 | 上海尤顺汽车部件有限公司 | Engine valve motion conversion device |
| CN107035450A (en) * | 2015-10-16 | 2017-08-11 | 现代自动车株式会社 | Changeable air valve opens duration/variable valve lift system and engine |
| CN110080849A (en) * | 2019-05-21 | 2019-08-02 | 姬腾飞 | The camshaft and valve actuator of engine |
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| Publication number | Publication date |
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| CN114033560A (en) | 2022-02-11 |
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