WO2010017759A1

WO2010017759A1 - A hydraulic camshaft and a hydraulic controlling system thereof

Info

Publication number: WO2010017759A1
Application number: PCT/CN2009/073182
Authority: WO
Inventors: 王建军
Original assignee: 奇瑞汽车股份有限公司
Priority date: 2008-08-13
Filing date: 2009-08-11
Publication date: 2010-02-18
Also published as: EP2325444A1; EP2325444A4

Abstract

A hydraulic camshaft and a hydraulic controlling system thereof include an ECU (14) and a solenoid valve (13). ECU respectively transfers four change signals to the solenoid valve (13) based a cam phase sensor (15) when the engine is running in the high and intermediate load status. The solenoid valve (13) respectively changes the oil pressure of the channels connected to the four hydraulic controlling parts on the camshaft basing on the signal. The statuses of the hydraulic controlling parts of the neighbor two cylinders are reversed. The change means that each cylinder is changed at the base circle position orderly. The invention is simple in structure and applied. The valve stroke is two segments. The engine performance and economical efficiency are improved, while the emission is reduced.

Description

Hydraulic camshaft and hydraulic control system thereof

The present invention relates to a hydraulic camshaft and its hydraulic control system, and more particularly to a hydraulic electromagnetic camshaft of an automobile engine. Background technique

At present, the international technology for two-stage valve lift is relatively mature. There are many technologies for this purpose. Two-stage hydraulic tappets or rocker arms can be selected. The most representative one is Schaeffler. Companies such as Eaton and Delphi can also choose two types of drive cams, such as: Honda i-vtec.

In addition to relying on a separate ECU, the hydraulic system is generally used for the control of these components. Compared with electromagnetic control, the hydraulic system is less difficult to design, but the execution time is longer, and the engine is not required for the instantaneous degree. Said that hydraulic control system is still the first choice. Summary of the invention

The technical problem to be solved by the present invention is to provide a hydraulic camshaft and a hydraulic control system thereof in view of the deficiencies of the prior art, which has a simple structure and can achieve a fast response.

Another technical problem to be solved by the present invention is to provide a hydraulic camshaft and a hydraulic control system thereof for the deficiencies of the prior art, which can change the valve lift and improve the engine performance.

The technical problem to be solved by the present invention is achieved by the following technical solutions:

A hydraulic camshaft includes a camshaft front end and a camshaft body, and a hydraulic control assembly is disposed between the camshaft front end and the camshaft body to move the hydraulic camshaft in the axial direction.

The hydraulic control assembly can move the hydraulic camshaft 10 mm in the axial direction.

It also includes a drive cam and a signal wheel. The drive cam consists of two types of cams that can be selected based on the axial position of the camshaft.

The hydraulic control assembly includes an oil hole, a guiding groove and an oil chamber. The oil hole is connected to the external oil passage and leads to the oil chamber. The oil pressure in the oil chamber determines the axial position of the cam shaft, and the guiding groove connects the cam shaft and limits the cam. Axial movement of the shaft.

It also includes an ECU and a solenoid valve that collectively control the oil pressure in the oil chamber.

A hydraulic electromagnetic camshaft includes a camshaft front end, a camshaft body, a solenoid valve and an electronic control unit ECU, and a hydraulic control assembly is disposed between the camshaft front end and the camshaft body, which moves the hydraulic camshaft along the axial direction , The hydraulic control assembly includes an oil hole, a guiding groove and an oil chamber. The oil hole is connected to the external oil passage and leads to the oil chamber. The oil pressure in the oil chamber determines the axial position of the cam shaft, and the guiding groove connects the cam shaft and limits the cam shaft. The axial movement, the ECU and the solenoid valve jointly control the oil pressure in the oil chamber.

The hydraulic control system of the hydraulic camshaft includes a solenoid valve and an electronic control unit ECU, and the solenoid valve and the electronic control unit ECU jointly control the hydraulic pressure in the hydraulic control assembly.

Each cylinder of the engine in which the hydraulic camshaft is located is provided with an independent hydraulic control system.

The first cylinder, the second cylinder, the third cylinder, and the fourth cylinder are respectively provided with a first cylinder hydraulic pressure control, a second cylinder hydraulic pressure control, a third cylinder hydraulic pressure control, and a fourth cylinder hydraulic pressure control.

The utility model further comprises a sensor, which senses and transmits a signal to the electronic control unit ECU, and the electronic control unit ECU transmits the group switching signal to the electromagnetic valve, and the electromagnetic valve respectively controls the oil connected to the hydraulic circuit of the first to fourth cylinder hydraulic control on the camshaft according to the signal. Pressure.

The sensor is a cam phase sensor that senses the signal of the signal wheel.

The state of the hydraulic control part of the adjacent two cylinders is reversed, that is, when the first cylinder hydraulic control and the third cylinder hydraulic control are turned on, the second cylinder hydraulic control and the fourth cylinder hydraulic control cylinder are closed, and the switches are switched to the respective cylinders in sequence. The base circle position is switched.

In other words, the present invention mainly has the following features:

(1) There is a hydraulic control part between the front end of the camshaft and the camshaft body in the mechanism, which can move the camshaft 10 mm in the axial direction;

(2) The driving cam of the camshaft is composed of two kinds of cams, and the driving cam can be selected according to the axial position of the camshaft;

(3) The axial position of the camshaft is determined by the oil pressure in the oil chamber, which is operated by a separate ECU and solenoid valve;

(4) Fast response process, the most common time is 300 crank angle, which can avoid abnormal combustion such as fire and temper;

(5) The independent hydraulic control system of each cylinder can make the engine select the most suitable switching time when switching, which improves the stability during engine switching.

In the control execution, the invention completes the cam switching of each cylinder in turn by hydraulic control, optimizes the control system to the maximum, and provides a feasible solution for the instantaneous response of the engine. At the same time, the lift of individual cylinders can be changed only in accordance with the needs of the engine operating conditions. This technology can be applied to a cylinder-stopped engine.

Compared with the prior art, the beneficial effects of the invention are as follows: the structure is simple and practical; the valve lift is Two-stage; can improve engine performance, fuel economy, and reduce emissions; specific advantages are: variable valve lift, engine performance is significantly improved; emissions, fuel consumption is significantly lower than the same displacement engine; simple and compact structure, The design is reasonable, the overall volume of the engine does not change significantly; each cylinder is controlled separately, and the control mode is flexible; the torque output of the engine at low speed is enhanced. DRAWINGS

Figure 1 is a partial cross-sectional view showing a hydraulic control portion of the present invention;

Figure 2 is a cross-sectional view showing the hydraulic control closed state of the present invention;

Figure 3 is a cross-sectional view showing the hydraulic control open state of the present invention;

Figure 4 is a schematic diagram of the system of the present invention.

The reference numerals of the main components are:

1 camshaft front end, 2—hydraulic control assembly, 3—drive cam, 4 camshaft body, 5—signal wheel, 6 oil hole, 7—guide groove, 8 oil chamber, 9 first cylinder hydraulic control, 10— Second cylinder hydraulic control, 11 - third cylinder hydraulic control, 12 - fourth cylinder hydraulic control, 13 - solenoid valve, 14 ECU, 15 - camshaft phase sensor. detailed description

The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments described below are preferred embodiments of various embodiments of the present invention.

1 is a partial cross-sectional view of a hydraulic control portion of the present invention; FIG. 2 is a cross-sectional view showing a hydraulic control closed state of the present invention; FIG. 3 is a cross-sectional view showing a hydraulic control open state of the present invention; As shown in Fig. 4 and in conjunction with Figs. 1 to 3, the hydraulic control system provided by the present invention is mainly composed of a hydraulic electromagnetic camshaft, a solenoid valve 13, a camshaft phase sensor 15, and an ECU 14.

When the engine is running at medium and high load conditions, the ECU 14 transmits four sets of switching signals to the solenoid valve 13 according to the cam phase sensor 15, respectively, and the solenoid valve 13 changes the oil pressure of the oil lines connecting the four hydraulic control sections on the camshaft according to the signal. The state of the hydraulic control part of the adjacent two cylinders is reversed, that is, when the first cylinder hydraulic pressure control 9 and the third cylinder hydraulic pressure control 11 are open, the second cylinder hydraulic pressure control 10 and the fourth cylinder hydraulic pressure control 12 are closed, switching For each cylinder to switch in the base circle position in turn, the entire switching procedure is as follows:

The first cylinder hydraulic control 9 is decompressed, and the second cylinder hydraulic control 10 is supercharged to complete the first cylinder cam switching; the second cylinder hydraulic control 10 is decompressed to complete the second cylinder cam switching; The third cylinder hydraulic control 11 is depressurized, and the fourth cylinder hydraulic control 12 is supercharged to complete the third cylinder cam switching; the fourth cylinder hydraulic control 12 is decompressed to complete the fourth cylinder cam switching.

When switching to low lift, the entire process is the opposite of the above.

During the switching of the driving cam state, the oil of the external oil passage enters and exits the oil chamber 8 from the oil hole 6, and the axial movement of the cam shaft is restricted and connected by the guide groove 7.

The technical solution of the present invention is further described in conjunction with the working principle diagram above:

As shown in FIG. 1 to FIG. 3, the present invention also provides a hydraulic electromagnetic camshaft, comprising: a camshaft front end 1, a camshaft body 4, a solenoid valve 13 and an electronic control unit ECU 14, and a hydraulic control assembly 2 is disposed on the cam. Between the front end 1 of the shaft and the camshaft body 4, the hydraulic cam shaft is moved in the axial direction. The hydraulic control assembly 2 includes an oil hole 6, a guiding groove 7 and an oil chamber 8, and the oil hole 6 is connected to the external oil passage. To the oil chamber 8, the oil pressure in the oil chamber 8 determines the axial position of the cam shaft, the guide groove 7 connects the cam shaft and limits the axial movement of the cam shaft, and the ECU 14 and the solenoid valve 13 jointly control the oil pressure in the oil chamber 8. .

The hydraulic control system of the hydraulic camshaft includes a cam phase sensor 15, a solenoid valve 13 and an electronic control unit ECU 14. The solenoid valve 13 and the electronic control unit ECU 14 jointly control the hydraulic pressure in the hydraulic control assembly 2, where the hydraulic camshaft is located Each cylinder of the engine is provided with an independent hydraulic control system, namely: the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are respectively provided with a first cylinder hydraulic control 9, a second cylinder hydraulic control 10, a third cylinder The hydraulic control 11, the fourth cylinder hydraulic control 12, the camshaft phase sensor 15 senses and transmits a signal to the electronic control unit ECU 14, and the electronic control unit ECU 14 transmits four sets of switching signals to the electromagnetic valve 13, and the electromagnetic valve 13 controls the connecting cam according to the signal. The on-shaft first cylinder hydraulic control 9 to the fourth cylinder are hydraulically controlled to the oil pressure of the 12 medium oil passage. The state of the hydraulic control part of the adjacent two cylinders is reversed, that is: when the first cylinder hydraulic pressure control 9 and the third cylinder hydraulic pressure control 11 are open, the second cylinder hydraulic pressure control 10 and the fourth cylinder hydraulic pressure control 12 cylinder are closed, switching The cylinders are sequentially switched at the base circle position.

The present invention has been exemplarily described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited to the above-described manner, as long as various improvements made by the method concept and technical solution of the present invention are adopted, or directly applied to other Occasionally, it is within the scope of the present invention.

Claims

Claim

A hydraulic camshaft, comprising: a camshaft front end (1) and a camshaft body (4), a hydraulic control assembly (2) disposed at a camshaft front end (1) and a camshaft body (4) Between it, the hydraulic camshaft can be moved in the axial direction.

The hydraulic camshaft according to claim 1, wherein the hydraulic control assembly (2) is capable of moving the hydraulic camshaft by 10 mm in the axial direction.

3. The hydraulic camshaft according to claim 1, further comprising a drive cam (3) and a signal wheel (5), the drive cam (3) being composed of two types of cams, which are axially adjustable according to the camshaft Location to choose.

The hydraulic camshaft according to any one of claims 1 or 3, wherein the hydraulic control assembly (2) comprises an oil hole (6), a guiding groove (7) and an oil chamber (8), The oil hole (6) is connected to the external oil passage and leads to the oil chamber (8). The oil pressure in the oil chamber (8) determines the axial position of the cam shaft, and the guide groove (7) connects the cam shaft and limits the axial direction of the cam shaft. motion.

A hydraulic camshaft according to claim 4, further comprising an ECU (14) and a solenoid valve (13) that collectively control the oil pressure in the oil chamber (8).

6. A hydraulic electromagnetic camshaft, comprising: a camshaft front end (1), a camshaft body (4), a solenoid valve (13) and an electronic control unit ECU (14), a hydraulic control assembly (2) Between the front end of the camshaft (1) and the camshaft body (4), which moves the hydraulic camshaft in the axial direction, the hydraulic control assembly (2) includes an oil hole (6), a guide groove (7) and The oil chamber (8), the oil hole (6) is connected to the external oil passage and leads to the oil chamber (8), the oil pressure in the oil chamber (8) determines the axial position of the cam shaft, and the guide groove (7) is connected to the cam shaft and Limiting the axial movement of the camshaft, the ECU (14) and the solenoid valve (13) collectively control the oil pressure in the oil chamber (8).

A hydraulic control system for a hydraulic camshaft according to any one of claims 1 to 4, characterized by comprising a solenoid valve (13) and an electronic control unit ECU (14), said solenoid valve (13) and The electronic control unit ECU (14) collectively controls the hydraulic pressure in the hydraulic control assembly (2).

8. The hydraulic control system according to claim 7, wherein each cylinder of the engine in which the hydraulic camshaft is located is provided with an independent hydraulic control system.

9. The hydraulic control system according to claim 8, wherein the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder are respectively provided with a first cylinder hydraulic pressure control (9), and a second cylinder hydraulic pressure Control (10), third cylinder hydraulic control

(11), fourth cylinder hydraulic control (12).

10. The hydraulic control system according to claim 9, further comprising a sensor that senses and transmits a signal to the electronic control unit ECU (14), and the electronic control unit ECU (14) transmits the four sets of switching signals to the electromagnetic valve (13) The solenoid valve (13) controls the oil pressure of the oil passages in the hydraulic control (9, 10, 11, 12) of the first to fourth cylinders connected to the camshaft according to the signals.

11. Hydraulic control system according to claim 10, characterized in that the sensor is a cam phase sensor (15) which senses the signal transmitted by the signal wheel (5).

12. The hydraulic control system according to any one of claims 10 or 11, wherein the state of the hydraulic control portion of the adjacent two cylinders is reversed, that is, the first cylinder hydraulic control (9) and the third cylinder hydraulic control (11) When it is turned on, the second cylinder hydraulic control (10) and the fourth cylinder hydraulic control (12) cylinder are closed, and the cylinders are switched to the respective base positions in sequence.