CN109667638B

CN109667638B - Valve control device and engine

Info

Publication number: CN109667638B
Application number: CN201811628857.2A
Authority: CN
Inventors: 周龙; 王金东; 高磊; 张天亮
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-06-02
Anticipated expiration: 2038-12-28
Also published as: CN109667638A

Abstract

The invention discloses a valve control device and an engine, wherein the valve control device comprises a valve bridge, a temperature control device, a cam shaft and a push rod, wherein two ends of the push rod are respectively connected with the cam shaft and the valve bridge, a shape memory alloy component is arranged on the push rod, and the temperature control device is used for supplying heat and cold to the shape memory alloy component. When the engine works, the push rod moves, and cold or heat is provided for the shape memory alloy component through the temperature control device according to the requirement. In the air valve control device provided by the application, the shape memory alloy assembly is arranged on the push rod, and the temperature control device is used for providing cold or heat for the shape memory alloy assembly to accurately control displacement change, so that continuous change of an air valve lift is optimized, and the working performance of an engine is improved.

Description

Valve control device and engine

Technical Field

The invention relates to the technical field of valve lift control, in particular to a valve control device. The invention also relates to an engine comprising the valve control device.

Background

The parameters of a valve actuating mechanism in a traditional engine are fixed values, the optimal performance of the engine in a range of a standard working condition is mainly ensured, and a valve control device is used as an important part of the engine and is mainly used for inputting air into the engine and discharging combusted waste gas.

Traditional valve control device includes valve bridge, camshaft and both ends respectively with camshaft and the push rod of valve bridge connection, wherein, during engine operation, the one end and the camshaft butt of push rod, the camshaft rotates and drives the push rod motion, the push rod drives the motion of valve bridge.

Disclosure of Invention

The invention aims to provide a valve control device to realize valve lift control. Another object of the present invention is to provide an engine including the above valve control apparatus.

In order to achieve the purpose, the invention provides a valve control device which comprises a valve bridge, a cam shaft, a push rod and a temperature control device, wherein the two ends of the push rod are respectively connected with the cam shaft and the valve bridge, the push rod is provided with a shape memory alloy component, and the temperature control device is used for supplying heat and cold to the shape memory alloy component.

Preferably, the temperature control device comprises a plurality of temperature control layers and a controller for controlling the temperature control layers to work, and the temperature control layers are sequentially overlapped along the motion direction of the push rod.

Preferably, a heat insulation layer is arranged between every two adjacent temperature control layers.

Preferably, the temperature control layer comprises a layer body, a cooling module for providing cold and a heating module for providing heat, and the cooling module and the heating module are both arranged on the layer body.

Preferably, the heating module is a microwave heating module or an electromagnetic heating module or a resistance heating module.

Preferably, the cooling module includes the shower and pass through the shower to the push rod sprays cooling medium's spray set, the shower is a plurality of, and is a plurality of the shower sets up along push rod circumference, just the export of shower faces the push rod, the shower sets up on the layer body.

Preferably, the number of the heating modules is multiple, and one heating module is arranged between two adjacent cooling modules.

Preferably, the temperature control layer is sleeved outside the push rod, and the temperature control layer is in clearance fit with the push rod.

Preferably, the shape memory alloy component comprises a plurality of memory alloy layers which are sequentially overlapped along the movement direction of the push rod, and two adjacent memory alloy layers are connected through a limiting protrusion and a limiting groove which are inserted.

Preferably, the temperature control module is fixed relative to the engine housing.

An engine comprising a valve control device according to any one of the preceding claims.

In the technical scheme, the valve control device provided by the invention comprises a valve bridge, a temperature control device, a cam shaft and a push rod, wherein two ends of the push rod are respectively connected with the cam shaft and the valve bridge, the push rod is provided with a shape memory alloy component, and the temperature control device is used for providing heat and cold for the shape memory alloy component. When the engine works, the push rod moves, and cold or heat is provided for the shape memory alloy component through the temperature control device according to the requirement.

According to the air valve control device, the shape memory alloy assembly is arranged on the push rod, and the temperature control device provides cold or heat for the shape memory alloy assembly to accurately control displacement change, so that continuous change of an air valve lift is optimized, and working performance of an engine is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a valve control apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a shape memory alloy element disposed outside a temperature control device according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a shape memory alloy element partially inserted into a temperature control device according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a shape memory alloy element fully inserted into a temperature control device according to an embodiment of the present invention;

FIG. 5 is a three-dimensional structural view of a shape memory alloy element and a temperature control device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a shape memory alloy device and a temperature control device according to an embodiment of the present invention;

FIG. 7 is a side cross-sectional view of the shape memory alloy element and temperature control device of FIG. 6;

FIG. 8 is a top cross-sectional view of the shape memory alloy element and temperature control device shown in FIG. 6;

FIG. 9 is a schematic diagram of a shape memory alloy element according to an embodiment of the present invention;

FIG. 10 is a schematic view of a memory alloy layer according to an embodiment of the present invention;

FIG. 11 is a left side view of the memory alloy layer of FIG. 10;

FIG. 12 is a top view of the memory alloy layer of FIG. 10;

FIG. 13 is a graph comparing lift control of the present application with conventional lift control provided by an embodiment of the present invention;

FIG. 14 is a table illustrating variable valve lift versus timing according to an embodiment of the present invention.

Wherein in FIGS. 1-12: 1-push rod, 11-shape memory alloy component, 111-memory alloy layer, 112-limit projection, 113-limit groove, 2-camshaft, 3-valve bridge, 4-temperature control device, 41-layer body, 42-heating module, 43-heat insulation layer, 44-spray pipe and 45-module containing cavity.

Detailed Description

The core of the invention is to provide a valve control device to realize valve lift control. Another core of the present invention is to provide an engine including the above valve control apparatus.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 14, in an embodiment, a valve control apparatus according to an embodiment of the present invention includes a valve bridge 3, a temperature control device 4, a camshaft 2, and a push rod 1 having two ends respectively connected to the camshaft 2 and the valve bridge 3, wherein the push rod 1 is provided with a shape memory alloy component 11, and the temperature control device 4 is configured to provide heat and cooling energy to the shape memory alloy component 11. In particular, the thermostat 4 may be mounted on a shape memory alloy component 11, the thermostat module being fixed relative to the engine casing for the purpose of assembling the valve control device.

When the engine works, the push rod 1 moves, and cold or heat is provided for the shape memory alloy component 11 through the temperature control device 4 according to requirements.

As can be seen from the above description, in the valve control device provided in the embodiment of the present application, by disposing the shape memory alloy component 11 on the push rod 1, since the shape memory alloy is a metal material based on the shape memory effect, the basic principle is based on the constraint and recovery characteristics of the memory alloy, when the shape of the memory alloy connecting member is recovered, the shape of the memory alloy connecting member is limited by the displacement of the connected member, and the shape of the memory alloy connecting member cannot reach the size of the free recovery, and the shape memory alloy generates a large stress to resist the deformation. For example, Ti-Ni shape memory alloys, when arrested, can produce a resistance of 700MPa, resulting in a certain tensile and compressive stresses in the memory alloy connection, which can be applied directly or indirectly to the driving member, thereby driving the moving member into relative displacement.

The valve Lift and Timing VLT (Variable Lift and Timing) is changed, that is, the Timing and the opening duration are changed while the Lift is changed, the valve Lift curve is shown in fig. 14, the shape memory alloy is a functional material for realizing the shape function of the memory component based on martensite-austenite transformation, and when the component with a certain shape formed by the shape memory alloy is cooled to a certain temperature, the component is subjected to martensite phase transformation. The shape of the member is modified in this state for the purpose of facilitating assembly and the like. When heated to a certain temperature, the material undergoes a reverse transformation and returns to its original shape as shown in fig. 14. The valve lift and the phase are flexibly controllable by changing the valve phase or the timing, so that the discharge amount is reduced, the new technology of optimizing the fuel economy is realized, the cold or heat is provided for the shape memory alloy component 11 through the temperature control device 4 to accurately control the displacement change, the continuous change of the valve lift is further optimized, and the working performance of an engine is improved.

On the other hand, the valve control device that this application provided, structural change is less, only need to change push rod 1 and increase temperature control device 4 can, specific, temperature control device 4 can be installed on the cylinder head, need not great structural change, and temperature control device 4 and push rod 1 separation control are convenient for install and reform transform.

In order to facilitate accurate temperature control of the shape memory alloy component 11, preferably, the temperature control device 4 includes a plurality of temperature control layers and a controller for controlling the temperature control layers to work, and the temperature control layers are sequentially stacked along the moving direction of the push rod 1. In order to facilitate the disassembly and assembly, the adjacent two temperature control layers are preferably detachably connected.

In order to avoid mutual interference of heat or cold between two adjacent temperature control layers, a heat insulation layer 43 is preferably arranged between the two adjacent temperature control layers. Specifically, the opposite ends of the thermal insulation layer 43 may be respectively bonded to two adjacent temperature control layers.

Preferably, the control by temperature change layer includes layer body 41, a cooling module for providing cold volume and a heating module 42 for providing heat, cooling module adopts the mode of spraying, spray media can be water, machine oil, diesel oil, liquid nitrogen, dry ice and other multiple cooling media, can form the orifice in control by temperature change group multiple directions and spray, realize even cooling, cooling module includes shower 44 and sprays the spray set of cooling media to push rod 1 through shower 44, shower 44 is a plurality ofly, a plurality of shower 44 set up along push rod 1 circumference, and shower 44's export is towards push rod 1, shower 44 sets up on layer body 41, in order to reduce the equipment degree of difficulty, machining efficiency is improved, shower 44 is a plurality ofly, a plurality of shower 44 set up along push rod 1 circumference, and shower 44's export orientation can be for opening the hole on layer body 41. Specifically, the control range of-50 ℃ to 600 ℃ of the shape memory alloy component 11 can be realized through the temperature control layer.

Specifically, the heating module 42 is a microwave heating module, an electromagnetic heating module, or a resistance heating module, and specifically, preferably, a module accommodating cavity for accommodating the heating module 42 is formed on the layer body 41. The plurality of heating modules 42 is provided, and the plurality of heating modules 42 is arranged along the circumferential direction of the shape memory alloy component 11. Specifically, the heating module 42 and the cooling module may be stacked in the moving direction of the push rod 1.

Further, it is preferable that one heating module 42 is provided between two adjacent cooling modules. Uniform heating can be formed in multiple directions of the temperature control layer. Specifically, the shape memory alloy elements 11 are sequentially arranged crosswise in the circumferential direction.

In order to reduce the friction between the temperature control layer and the push rod 1, preferably, the temperature control layer is sleeved outside the push rod 1, and the temperature control layer is in clearance fit with the push rod 1. More preferably, the heat insulation layer 43 is sleeved outside the push rod 1.

Further, as shown in fig. 9 to 13, where a in fig. 13 is a lift curve of the deformed push rod 1 of the present application, and b is a lift curve of the driven push rod 1, the shape memory alloy component 11 includes a plurality of memory alloy layers 111 sequentially stacked along the moving direction of the push rod 1, and two adjacent memory alloy layers 111 are connected by a limit protrusion 112 and a limit groove 113 which are inserted. Specifically, for the convenience of assembly, the memory alloy layer 111 at the intermediate position is preferably identical in shape. Specifically, the plurality of memory alloy layers 111 are directly connected through the limiting protrusions 112 and the limiting grooves 113, and the stacked group of the shape memory alloy components 11 is finally connected with the push rod 1 at other positions. The shape memory alloy component 11 can realize the deformation control in the lift range of-200 mm to 200 mm.

Of course, the two adjacent memory alloy layers 111 can also be connected by the form of a guide rail and a sliding groove.

Specifically, the number and the arrangement shape of the memory alloy layer 111 and the temperature control layer are determined according to actual requirements, and the application is not particularly limited.

By embedding the shape memory alloy component 11, which is the main body part of the scheme, into the engine push rod 1, the memory alloy layer 111 and the shape memory alloy component 11 are connected with other parts of the push rod 1 into a whole, and the temperature control layer can control the required temperature in different temperature control modes, so that a stacking group of a plurality of temperature control layers can be formed, such as a first temperature control layer, a second temperature control layer and the like. The shape memory alloy component 11 is mainly composed of shape memory alloy, and it can also be formed by stacking a plurality of memory alloy layers 111, such as memory alloy layer one, memory alloy layer, etc., and different memory alloy layers 111 can form different deformation displacements according to the temperature change.

The stacking mode can effectively avoid displacement mutation caused by the change of the shape memory alloy along with the temperature, forms a similar grating structure, accurately controls the displacement change, can basically realize the continuous change of the valve lift, can effectively avoid the problem of slow response of the temperature control type shape memory alloy, and finally realizes that the continuous control of the valve lift adopts the stacking mode.

The control logic is as follows, with reference to fig. 2 to 4:

when the cam is ready to enter a lift range, the preheating of the 1 st-level temperature control layer of the temperature control layer stack is started, when the 1 st-level memory alloy layer 111 and the 1 st-level temperature control layer start to contact, the memory alloy layer 111 starts to deform, the valve lift is changed from Y0 to X0 to Y1 to X1, and then the preheating of the 2 nd-level temperature control layer is started;

with the lifting of the push rod 1, the temperature control layer 1 maintains a certain heating temperature and is in contact with the memory alloy layer 111 of the layer 2, the memory of the second layer is deformed, and the contribution to the valve lift is X2, so that the valve lift is changed from Y1-X1 to Y2-X1 + X2, wherein X1 and X2 are actually the integral values of the displacement lift of the memory alloy layer 111 at a certain cam angle.

By analogy, the temperature control layers are respectively contacted with the memory alloy layer 111, and the valve lift Yn is marked as X1+ X2+ X3+ … … Xn-1+ Xn by calibrating the temperature change of the temperature control layers and the corresponding time. Yn here can be determined according to the stacking of the memory alloy layer 111 and the temperature control layer, and Yn-1 or lower valve lift can be determined according to the specific working layer number and the set temperature of the temperature control layer, so that the continuous variable of the valve lift can be realized, wherein the layer number of the temperature control layer determines the accumulated lift amount of the push rod 1, and the temperature of the temperature control layer determines the lift amount of deformation in the single memory alloy layer 111.

In the descending stage of the cam, the same principle is implemented by cutting off the heating source of the temperature control layer and introducing the cooling source, so that the memory alloy layer 111 is rapidly cooled and contracted and deformed, and further description is omitted. Specifically, the plurality of heating modules 42 and the plurality of cooling modules are sequentially heated or cooled along the direction in which the memory alloy layer 111 enters the temperature control layer.

The application provides an engine, including valve control device, wherein valve control device is any kind of above-mentioned valve control device, and the aforesaid has narrated concrete structure and effect about valve control mechanism, and the engine that this application provided includes above-mentioned valve control device, and is specific above-mentioned effect equally, and this text is no longer repeated.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a valve control device, including valve bridge (3), camshaft (2) and both ends respectively with camshaft (2) with push rod (1) that valve bridge (3) are connected, its characterized in that, be equipped with shape memory alloy subassembly (11) on push rod (1), still including be used for to shape memory alloy subassembly (11) provide heat and cold volume temperature control device (4), temperature control device (4) include a plurality of control by temperature change layers and control the controller of control by temperature change layer work, the control by temperature change layer is followed push rod (1) direction of motion superposes in proper order.

2. A valve control device according to claim 1, characterized in that a thermal insulation layer (43) is provided between two adjacent temperature control layers.

3. Valve control device according to claim 1, characterized in that the temperature control layer comprises a layer body (41), a cooling module for providing cooling energy and a heating module (42) for providing heating energy, both the cooling module and the heating module (42) being arranged on the layer body (41).

4. Valve control device according to claim 3, characterized in that the heating module (42) is a microwave heating module or an electromagnetic heating module or a resistance heating module.

5. A valve control apparatus according to claim 3, wherein the cooling module comprises a plurality of spray pipes (44) and a spray device for spraying a cooling medium to the push rod (1) through the spray pipes (44), the plurality of spray pipes (44) are arranged along the circumference of the push rod (1), the outlets of the spray pipes (44) face the push rod (1), and the spray pipes (44) are arranged on the layer body (41).

6. A valve control apparatus according to claim 5, characterized in that the heating module (42) is plural, and one heating module (42) is provided between adjacent two of the cooling modules.

7. A valve control device as claimed in claim 1, characterized by said temperature control layer being sleeved outside said push rod (1), said temperature control layer being in clearance fit with said push rod (1).

8. A valve control device according to claim 1, characterized in that the shape memory alloy component (11) comprises a plurality of memory alloy layers (111) which are sequentially overlapped along the motion direction of the push rod (1), and two adjacent memory alloy layers (111) are connected through a limit protrusion (112) and a limit groove (113) which are inserted.

9. A valve control device according to any one of claims 1-8, characterized in that the temperature control device (4) is fixed in relation to the engine house.

10. An engine comprising a valve control device, characterized in that the valve control device is the valve control device according to any one of claims 1-9.