CN114033560A

CN114033560A - Grouping control method of engine variable valve device and engine

Info

Publication number: CN114033560A
Application number: CN202110915989.9A
Authority: CN
Inventors: 姬腾飞; 林宗云; 金冬日; 于洪强; 石伟
Original assignee: Suzhou Sanlin Wanteng Automobile Technology Co ltd
Current assignee: Suzhou Sanlin Wanteng Automobile Technology Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-02-11
Anticipated expiration: 2041-08-02
Also published as: CN114033560B

Abstract

The grouping control method of the engine variable valve device can enable the rocker arm roller of the variable valve device with the switchable roller type rocker arm to have larger switching space, reduce the requirement on roller switching speed and better ensure the reliability of roller switching.

Description

Grouping control method of engine variable valve device and engine

Technical Field

The invention relates to a group control method of an engine variable valve device and an engine, and belongs to the technical field of engines.

Background

The variable valve device of the engine is widely applied to various engines, the variable valve device has various structural forms, is common, is usually arranged on a rocker arm mechanism or a camshaft, and is usually controlled by adopting an electromagnetic valve or other control devices, and sometimes the variable valve device is controlled in groups, for example, the variable valve device of several cylinders is controlled by adopting one electromagnetic valve, which is common on an in-cylinder brake device of an engine for a heavy vehicle, and the in-cylinder brake device also belongs to the variable valve device, and the variable valve device can be widely applied to the engine for the heavy vehicle by changing the valve lift of the engine to enable the engine to generate a braking action. The engine for the heavy-duty vehicle is six jars usually, and its in-cylinder arresting gear sets up on the rocking arm usually to generally adopt two solenoid valves to carry out grouping control, the most common grouping mode is for dividing two sets of, and two and three jars are a set of, and four five six jars are a set of, and every group controls with a solenoid valve respectively, can carry out the stepping to braking power like this, only controls a set of arresting gear and carries out work when braking power demand is less, can control two sets of arresting gear simultaneous workings when braking power demand is higher.

Chinese patent CN110080849A discloses a camshaft and a valve driving device of an engine, which is also a variable valve device, and the rocker arm of the device adopts a slidable roller and is provided with a driving device, so that the roller of the rocker arm can be switched from one cam to another cam, thereby realizing two valve lifts. For the switchable roller type rocker arm mechanism, two cams are required to be ensured to be positioned at a base circle part when the rollers are switched, in order to ensure the switching, a unique camshaft structure is designed, a flange is arranged between the two cams and is arranged at a part of the two cams with a lift range, only the two cams are positioned at the base circle part without the flange, and the part without the flange is used as a switching window of the rollers, 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 flange and cannot be switched, and when the other rocker arm rollers enter the switching window along with the rotation of the camshaft, the switching can be smoothly carried out, the unique camshaft structure can ensure that the switching of each roller is carried out at the base circle part, thereby ensuring the switching reliability of the rollers, for a detailed description, reference is made to this patent specification.

With the variable valve apparatus disclosed in CN110080849A, however, in grouping control of the rocker arm mechanisms thereof, for example, with a six-cylinder engine, if in a grouping manner that is currently commonly adopted, namely one group of two cylinders and three cylinders and one group of four cylinders, five cylinders and six cylinders, because the ignition sequence of the six-cylinder engine is usually 1-5-3-6-2-4, the two cam phases of the adjacent ignition sequence are separated by 60 cam angles, namely the total separation angle of the two cam phases and the three cam phases of the two cylinders and the three cam phases is 240 cam angles, the arrangement of the flange therefore also requires at least 240 cam angle degrees, leaving only 120 cam angle degrees for the portion of the roller that can be switched (the switching window), this is a challenge in switching the roller, and the switching speed of the roller needs to be very fast to complete the switching within the limited cam rotation angle, 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 an engine variable valve device.

A group control method of a variable valve apparatus of an engine provided with a variable valve apparatus which is provided on a rocker arm mechanism or a camshaft of each cylinder and controlled by a control element, the variable valve apparatus being controlled in groups of at least two groups, each group being controlled by one control element, the variable valve apparatus including at least two cylinders in each group, the cylinders in each group having an adjacent firing order.

The invention also provides an engine, and the engine adopts the grouping control method of the engine variable valve device.

The invention has the beneficial effects that: the grouping control method of the engine variable valve device provided by the invention can enable the rocker roller of the variable valve device with the switchable roller type rocker arm to have larger switching space, reduce the requirement on the roller switching speed and better ensure the reliability of roller switching.

Drawings

The accompanying drawings 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 principles of the invention. In the drawings:

fig. 1 is a schematic diagram of connections between main components and a packet control method according to a specific embodiment of the present invention;

FIG. 2 is a schematic illustration of the relative positions of a camshaft and rocker arm rollers according to an exemplary embodiment of the present invention;

FIG. 3 is a schematic illustration of the position of the flange between cams in a current common group control mode;

fig. 4 is a schematic diagram showing a position where the flanges are arranged between the cams in the group control method according to the present invention.

Detailed Description

The following detailed description will fully describe the specific technical solutions adopted in the embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 is a schematic diagram showing a connection between main components and a grouping Control method according to an embodiment of the present invention, in which an ecu (electronic Control unit) represents a Control unit of an engine having a variable valve device provided on a rocker mechanism or a camshaft of each cylinder, and in this embodiment, the variable valve device is provided on a rocker arm, the rocker arm is a rocker arm with a roller follower, and the variable valve mode is a switchable roller type, and two different cams are provided on a camshaft of the switchable roller type, and a roller of the rocker arm can slide in an axial direction and is driven by a driving device, so that the rocker arm roller can be switched from one cam to another cam, thereby realizing two valve lifts. Moreover, in order to ensure that the two cams are both located at the base circle part when the roller is switched, the cam shaft is provided with a flange between the two cams, the flange is arranged at the part of the two cams with the lift, only the two cams are both the base circle part and are not provided with the flange, and the part without the flange is used as the switching window of the roller, so that one electromagnetic valve can be adopted to control the driving devices of a plurality of rocker arm rollers, when the first rocker arm roller is located at the switching window, other rocker arm rollers can be blocked by the flange and can not be switched, and when the other rocker arm rollers enter the switching window along with the rotation of the cam shaft, the switching of each roller can be ensured to be carried out at the base circle part, thereby ensuring the reliability of the roller switching, 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 the Chinese patent CN110080849A, the detailed description of the working principle and the process thereof can be referred to the patent specification.

In the present embodiment, as shown in fig. 1, the variable valve devices (i.e., rocker arms) are controlled in groups, the groups being divided into at least two groups, each group being controlled by one control element, the variable valve devices having at least two cylinders in each group, the cylinders in each group having adjacent firing orders. Taking a six-cylinder engine as an example in the embodiment, each cylinder has one rocker arm with a variable valve function, the 6 rocker arms are controlled in two groups, one group is provided for every 3 cylinders, different from the currently common grouping mode, the two groups of cylinders in the embodiment are respectively one cylinder, two cylinders, four cylinders, three cylinders, five cylinders and six cylinders, and the rocker arms of each group of cylinders are respectively controlled by one control element, as shown in fig. 1. Since six-cylinder engines typically have firing orders of 1-5-3-6-2-4, this group control is characterized by the fact that the cylinders in each group have adjacent firing orders, and likewise, when the cylinders in two groups are one, three, five and two, four, six cylinders, respectively, or one, four, five and two, three, six cylinders, respectively, 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 a camshaft, for a roller rocker arm directly driven by the camshaft, the angular 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 angular position of the roller of each cylinder relative to the cam of the cylinder can be embodied on the cam of one cylinder, as shown in fig. 2, the included angle between the rocker arm rollers of each adjacent ignition sequence is 60 degrees of cam rotation angle, and when the camshaft rotates, the rocker arm rollers of each cylinder can be sequentially driven according to the ignition sequence. In the variable valve actuating apparatus disclosed in CN110080849A, when a solenoid valve is used to control a plurality of rocker arm rollers, in this embodiment, taking the rocker arm rollers for controlling three cylinders as an example, to ensure that each rocker arm roller is switched on the base circle portion, it is necessary to provide a flange between two cams to block the roller that does not enter the switching window portion for switching, if the grouping method commonly used at present, i.e. one two and three cylinders are grouped into one group, and four five and six cylinders are grouped into one group, it is necessary to provide a flange between the position of the first cylinder roller relative to the cam and the position of the third cylinder roller relative to the cam in the direction of rotation of the camshaft to block the rocker arm rollers of the two cylinders (i.e. the third and second cylinders when the first cylinder is the first cylinder) that are ignited in the group for 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 in the direction of rotation of the camshaft is 240 degrees of the cam, the flange arrangement therefore also requires at least 240 cam degrees, leaving only 120 cam degrees for the roller to switch (the switching window). Similarly, for the other set (four five six cylinders), the flange arrangement also requires at least 240 cam degrees. When the grouping control method is adopted, the two groups of cylinders in the embodiment are respectively one cylinder, two cylinders, four cylinders and three cylinders, five cylinders and six cylinders, according to the above-described requirement for flange arrangement, it is necessary to provide a flange between the position of the second cylinder roller relative to the cam and the position of the first cylinder roller relative to the cam in the rotational direction of the camshaft to block the rocker arm rollers of the two cylinders (the fourth and first cylinders when the second cylinder is the first cylinder) in the group that are fired after ignition, as shown in fig. 4, since the three cylinders in the group have adjacent firing sequences, the angle between the position of the second cylinder roller relative to the cam and the position of the first cylinder roller relative to the cam in the direction of rotation of the camshaft is 120 cam degrees, the flange arrangement thus requires only 120 cam degrees, leaving a 240 cam degree portion (switching window) for the roller to switch. Similarly, only 120 cam degrees are required for the placement of the other set (three five six cylinders) of flanges. Therefore, when the group control method of the present invention is adopted, in the camshaft of the variable valve driving device disclosed in CN110080849A, the portion between the two cams where the flange needs to be provided has the smallest angular space, and the portion (switching window) left for the roller to be switched has the largest angular space, so that the reliability of roller switching is sufficiently ensured. Similarly, when the grouping control method provided by the invention is adopted for grouping with different numbers (for example, three groups are adopted for a six-cylinder machine, and each group has two cylinders), the advantages are provided.

Obviously, not only for the variable valve driving device disclosed in CN110080849A, but also for variable valve devices of other structural forms designed according to the principle described in CN110080849A, the variable valve device group control method according to the present invention is favorable for the variable valve device to have the largest switching space, and is favorable for the variable valve device to operate more reliably.

It should be noted that the above-mentioned embodiments are only preferred embodiments adopted to illustrate the design and principle of the present invention, and should not be understood as limitations of the present invention, and it should be apparent to those skilled in the art that the technical solutions described in the above-mentioned embodiments can be further modified, or some technical features can be replaced, combined, and the like without departing from the concept of the present invention, and these should be regarded as the protection scope of the present invention.

Claims

1. A group control method of a variable valve apparatus of an engine provided with a variable valve apparatus provided on a rocker arm mechanism or a camshaft of each cylinder and controlled by a control element, characterized in that: the variable valve device is controlled in groups, the groups are at least two groups, 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.

2. An engine, characterized in that: the engine employs the group control method of the engine variable valve device according to claim 1.