阅读说明：本技术 发动机配气系统、发动机及车辆 (Engine air distribution system, engine and vehicle ) 是由 王斌 从东锋 李阳 于 2019-11-15 设计创作，主要内容包括：本发明提供了一种发动机配气系统、发动机及车辆,涉及气门控制的技术领域,发动机配气系统包括控制机构、执行机构和检测机构；检测机构包括活塞位置传感器和曲轴转速传感器,控制机构与活塞位置传感器、曲轴转速传感器和执行机构分别电连接。本发明采用活塞位置传感器,结构简单,且控制更加灵活；并且由于气缸的活塞位置能够直接反应气缸的燃烧室内的状态,并结合发动机的曲轴的转速,更加贴合实际发动机的运行需求,进而提高了发动机的燃油经济性,并改善了排放。(The invention provides an engine gas distribution system, an engine and a vehicle, and relates to the technical field of valve control, wherein the engine gas distribution system comprises a control mechanism, an actuating mechanism and a detection mechanism; the detection mechanism comprises a piston position sensor and a crankshaft rotation speed sensor, and the control mechanism is electrically connected with the piston position sensor, the crankshaft rotation speed sensor and the execution mechanism respectively. The invention adopts the piston position sensor, has simple structure and more flexible control; and because the piston position of the cylinder can directly reflect the state in the combustion chamber of the cylinder and combine the rotating speed of the crankshaft of the engine, the running requirement of the actual engine is better fitted, and then the fuel economy of the engine is improved, and the emission is improved.)

1. The engine air distribution system is characterized by comprising a control mechanism (9), an actuating mechanism (300) and a detection mechanism;

the detection mechanism comprises a piston position sensor (5) and a crankshaft rotating speed sensor (1), the piston position sensor (5) is used for detecting piston position information of a piston (2) of an engine cylinder (17), and the crankshaft rotating speed sensor (1) is used for detecting crankshaft rotating speed information;

the control mechanism (9) is electrically connected with the piston position sensor (5), the crankshaft rotation speed sensor (1) and the actuating mechanism (300) respectively, and the control mechanism (9) is used for receiving piston position information of a piston (2) of an engine cylinder (17) detected by the piston position sensor (5) and crankshaft rotation speed information detected by the crankshaft rotation speed sensor (1) and controlling the actuating mechanism (300) to act according to the crankshaft rotation speed information and the piston position information so as to realize the opening or closing of the valve (3).

2. The engine valve system according to claim 1, characterized in that the actuator (300) comprises a hydraulic cylinder (7), a hydraulic oil circuit, a solenoid valve (8) and a rocker arm (6);

the hydraulic oil way comprises an oil inlet way (13) and an oil outlet way (10), and the oil inlet way (13) is communicated with an oil inlet of the hydraulic cylinder (7); the oil outlet path (10) is communicated with an oil outlet of the hydraulic cylinder (7), the electromagnetic valve (8) is arranged on the oil outlet path (10), and the control mechanism (9) controls the electromagnetic valve (8) to be closed or opened according to the opening time and the opening maintaining duration of the air valve (3) so as to control the extension and contraction of a piston rod of the hydraulic cylinder (7);

the middle part of rocking arm (6) is used for rotating to be connected on engine cylinder (17), the first end of rocking arm (6) be used for with valve (3) butt, the second end of rocking arm (6) be used for with the piston rod of pneumatic cylinder (7) is connected, the piston rod is flexible can drive rocking arm (6) rotate, so that the opening or closing of first end control valve (3) of rocking arm (6).

3. The engine air distribution system according to claim 1, characterized in that the actuator (300) comprises a hydraulic cylinder (7), a hydraulic oil circuit and a solenoid valve (8), and a piston rod of the hydraulic cylinder (7) is matched with the valve (3);

the hydraulic oil way comprises an oil inlet way (13) and an oil outlet way (10), and the oil inlet way (13) is communicated with an oil inlet of the hydraulic cylinder (7); the oil outlet path (10) is communicated with an oil outlet of the hydraulic cylinder (7), the electromagnetic valve (8) is arranged on the oil outlet path (10), and the control mechanism (9) controls the electromagnetic valve (8) to be closed or opened according to the opening time and the opening maintaining duration of the valve (3) so as to open or close the valve (3).

4. The engine air distribution system of claim 2 or 3, characterized in that an oil inlet of the oil inlet path (13) is communicated with the main lubricating oil path (14) and is fed by using the pressure of the main lubricating oil path (14);

an oil outlet of the oil outlet path (10) is communicated with an oil pan (11).

5. An engine air distribution system according to claim 2 or 3, characterized in that a pressure limiting valve (12) is arranged on the oil inlet path (13).

6. The engine valve train according to claim 1, characterized in that the actuator (300) comprises an electromagnetic relay and a rocker arm (6);

the middle part of the rocker arm (6) is used for being rotatably connected to an engine cylinder (17), the first end of the rocker arm (6) is used for being abutted to the valve (3), and the second end of the rocker arm (6) is used for being matched with the electromagnetic relay;

the control mechanism (9) controls the electromagnetic relay to be connected with or disconnected from the second end of the rocker arm (6) according to the opening time and the opening maintaining duration of the valve (3), so that the first end of the rocker arm (6) controls the valve (3) to be opened or closed.

7. Engine air distribution system according to claim 1, characterized in that the actuator (300) comprises an electromagnetic relay cooperating with the valve (3);

the control mechanism (9) controls the electromagnetic relay to be connected with or disconnected from the valve (3) according to the opening time and the opening maintaining duration of the valve (3) so as to control the valve (3) to be opened or closed.

8. An engine comprises an engine cylinder (17) and a crankcase (15), wherein a valve (3) is arranged on the engine cylinder (17), the valve (3) is opened or closed through lifting, and a crankshaft (16) of the engine is arranged in the crankcase (15); wherein the engine further comprises an engine air distribution system according to any one of claims 1-7;

the piston position sensor (5) is arranged on a cylinder cover (18) of the engine cylinder (17), and the crankshaft speed sensor (1) is arranged on the crankcase (15).

9. The engine according to claim 8, characterized in that the actuator (300) comprises a hydraulic cylinder (7), a hydraulic circuit, a solenoid valve (8) and a rocker arm (6), or the actuator (300) comprises a hydraulic cylinder (7), a hydraulic circuit and a solenoid valve (8);

the hydraulic oil circuit is arranged on a cylinder cover (18) of the engine cylinder (17).

10. A vehicle comprising an ECU, characterized in that the vehicle further comprises an engine valve train according to any one of claims 1-7, or the vehicle further comprises an engine according to claim 8 or 9; the control mechanism (9) is the ECU.

Technical Field

The invention relates to the technical field of valve control, in particular to an engine gas distribution system, an engine and a vehicle.

Background

The valve of the engine is one of important accessories of the engine, and the valve mainly has the function of supplying air into a combustion chamber of the engine or discharging exhaust gas after combustion.

The control of the air valve is realized by an engine air distribution system, and the existing engine air distribution system generally adopts a camshaft to drive the air valve to realize air inlet and exhaust control. The working principle is as follows: the engine wheel train (timing gear) drives the camshaft to rotate, the air inlet cam and the air outlet cam on the camshaft synchronously rotate and are contacted with the push rod according to a design state, and the push rod pushes the tappet to drive the valve so as to control the opening and closing time and the valve lift of the air inlet valve and the air outlet valve, so that the air inlet and the air outlet of the engine are realized. The mode that the mechanical structures such as the timing gear, the tappet, the push rod, the double cam shaft and the like are adopted to realize the opening or closing of the valve is realized by the mechanical action process that the timing gear and the cam shaft drive the tappet to be in intermittent contact with the valve, the variable timing control of the valve realized by the mechanical structures, the opening and opening time of the valve and the like can only depend on the operation intermittent process of mechanical equipment, and the flexibility is insufficient.

In order to overcome the defects, in the prior art, an ECU (electronic control unit) is adopted to control an electric control direct drive valve such as a hydraulic drive component, and in the mode, the opening or closing of the valve depends on the hydraulic drive component, the action of the hydraulic drive component is realized according to the automatic control of the ECU, and the problem of insufficient flexibility of mechanical control is solved. The existing ECU controls a hydraulic driving component of a valve by combining rotation speed information of a crankshaft and piston position information of a cylinder, wherein the piston position information is obtained by judging the position of the piston by using a traditional timing gear, a camshaft and other mechanisms, and the existing ECU is complex in structure and insufficient in flexibility.

Disclosure of Invention

The invention aims to provide an engine air distribution system to solve the technical problems that in the prior art, the position of a piston needs to be judged by means of mechanisms such as a timing gear, a cam shaft and the like in an air valve electric control process, the structure is complex, and the flexibility is insufficient.

The second purpose of the invention is to provide an engine, so as to solve the technical problems that the position of a piston needs to be judged by means of mechanisms such as a timing gear, a camshaft and the like in the valve electric control process in the prior art, the structure is complex, and the flexibility is insufficient.

The third purpose of the invention is to provide a vehicle, so as to solve the technical problems that the position of a piston needs to be judged by means of mechanisms such as a timing gear, a camshaft and the like in the valve electric control process in the prior art, the structure is complex, and the flexibility is insufficient.

The invention provides an engine valve system, which comprises a control mechanism, an actuating mechanism and a detection mechanism;

the detection mechanism comprises a piston position sensor and a crankshaft rotating speed sensor, the piston position sensor is used for detecting piston position information of a piston of an engine cylinder, and the crankshaft rotating speed sensor is used for detecting crankshaft rotating speed information;

the control mechanism is electrically connected with the piston position sensor, the crankshaft rotation speed sensor and the actuating mechanism respectively, and is used for receiving piston position information of a piston of an engine cylinder detected by the piston position sensor and crankshaft rotation speed information detected by the crankshaft rotation speed sensor and controlling the actuating mechanism to act according to the crankshaft rotation speed information and the piston position information so as to open or close the valve.

Further, the actuating mechanism comprises a hydraulic cylinder, a hydraulic oil way, an electromagnetic valve and a rocker arm;

the hydraulic oil way comprises an oil inlet way and an oil outlet way, and the oil inlet way is communicated with an oil inlet of the hydraulic cylinder body; the oil outlet path is communicated with an oil outlet of the hydraulic cylinder body, the electromagnetic valve is arranged on the oil outlet path, and the control mechanism controls the electromagnetic valve to be closed or opened according to the opening time and the opening maintaining duration of the valve so as to control the extension and contraction of a piston rod of the hydraulic cylinder;

the middle part of rocking arm is used for rotating to connect on engine cylinder, the first end of rocking arm be used for with the valve butt, the second end of rocking arm be used for with the piston rod of pneumatic cylinder is connected, the flexible of piston rod can drive the rocking arm rotates, so that the first end control valve of rocking arm opens or closes.

Further, the actuating mechanism comprises a hydraulic cylinder, a hydraulic oil circuit and an electromagnetic valve, and a piston rod of the hydraulic cylinder is matched with the valve;

the hydraulic oil way comprises an oil inlet way and an oil outlet way, and the oil inlet way is communicated with an oil inlet of the hydraulic cylinder body; the oil outlet path is communicated with an oil outlet of the hydraulic cylinder body, the electromagnetic valve is arranged on the oil outlet path, and the control mechanism controls the electromagnetic valve to be closed or opened according to the opening time and the opening maintaining duration of the valve, so that the valve is opened or closed.

Further, an oil inlet of the oil inlet path is communicated with the main lubricating oil path, and oil is fed by using the pressure of the main lubricating oil path;

and an oil outlet of the oil outlet path is communicated with the oil pan.

Furthermore, a pressure limiting valve is arranged on the oil inlet pipeline.

Further, the actuating mechanism comprises an electromagnetic relay and a rocker arm;

the middle part of the rocker arm is used for being rotatably connected to an engine cylinder, the first end of the rocker arm is used for being abutted against a valve, and the second end of the rocker arm is used for being matched with the electromagnetic relay;

the control mechanism controls the electromagnetic relay to be connected with or disconnected from the second end of the rocker arm according to the opening time and the opening maintaining duration of the valve, so that the first end of the rocker arm controls the valve to be opened or closed.

Further, the actuator comprises an electromagnetic relay cooperating with the valve;

the control mechanism controls the electromagnetic relay to be connected with or disconnected from the valve according to the opening time and the opening maintaining duration of the valve so as to control the opening or closing of the valve.

The invention provides an engine, which comprises an engine cylinder and a crankcase, wherein the engine cylinder is provided with an air valve, the air valve is opened or closed through lifting, and a crankshaft of the engine is arranged in the crankcase; the engine further comprises an engine valve system according to any one of the above items;

the piston position sensor is arranged on a cylinder cover of the engine cylinder, and the crankshaft rotating speed sensor is arranged on the crankcase.

Preferably, the executing mechanism comprises a hydraulic cylinder, a hydraulic oil path, an electromagnetic valve and a rocker arm, or the executing mechanism comprises a hydraulic cylinder, a hydraulic oil path and an electromagnetic valve;

the hydraulic oil circuit is arranged on a cylinder cover of the engine cylinder.

The invention provides a vehicle, which comprises an ECU (electronic control Unit), and further comprises the engine air distribution system, or further comprises the engine; the control mechanism is the ECU.

The invention provides an engine gas distribution system which comprises a control mechanism, an actuating mechanism and a detection mechanism, wherein the detection mechanism comprises a piston position sensor and a crankshaft rotating speed sensor, the piston position sensor is used for detecting piston position information of a piston of an engine cylinder, and the crankshaft rotating speed sensor is used for detecting crankshaft rotating speed information. The control mechanism controls the actuating mechanism to be piston position information and crankshaft rotating speed information, namely the opening or closing of the valve is controlled by taking the piston position information of the position detection and detection mechanism and the crankshaft rotating speed information of the crankshaft rotating speed sensor as parameters, so that the opening or closing of the valve of the engine is selectively and flexibly controlled according to the running state of the engine. Compared with the existing mode that the position information of the piston is judged by mechanisms such as a timing gear, a cam shaft and the like, the piston position sensor is adopted in the embodiment, the structure is simple, and the control is more flexible; and because the piston position of the cylinder can directly reflect the state in the combustion chamber of the cylinder and combine the rotating speed of the crankshaft of the engine, the running requirement of the actual engine is better fitted, and then the fuel economy of the engine is improved, and the emission is improved.

The engine and the vehicle provided by the invention comprise the engine air distribution system provided by the invention, and have the same beneficial effects as the engine air distribution system provided by the invention.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of an engine air distribution system provided by an embodiment of the invention;

fig. 2 is a schematic diagram of an actuator of an engine valve timing system according to an embodiment of the present invention.

Icon: 1-crankshaft speed sensor; 2-a piston; 3-air valve; 4-a valve spring; 5-a piston position sensor; 6-rocker arm; 7-a hydraulic cylinder; 8-an electromagnetic valve; 9-a control mechanism; 10-oil outlet path; 11-oil sump; 12-a pressure limiting valve; 13-oil inlet path; 14-main oil circuit of lubricating oil; 15-a crankcase; 16-a crankshaft; 17-an engine cylinder; 18-cylinder cover; 300-an actuator.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to fig. 2, an engine valve timing system according to an embodiment of the present invention includes a control mechanism 9, an actuator 300, and a detection mechanism.

The detection mechanism comprises a piston position sensor 5 and a crankshaft rotating speed sensor 1, wherein the piston position sensor 5 is used for detecting piston position information of a piston 2 of an engine cylinder 17, and the crankshaft rotating speed sensor 1 is used for detecting crankshaft rotating speed information.

The control mechanism 9 is electrically connected with the piston position sensor 5, the crankshaft rotation speed sensor 1 and the actuating mechanism 300 respectively, the control mechanism 9 is used for receiving piston position information of the piston 2 of the engine cylinder 17 detected by the piston position sensor 5 and crankshaft rotation speed information detected by the crankshaft rotation speed sensor 1, determining opening time and opening maintaining duration of the valve 3 according to the crankshaft rotation speed information of the crankshaft 16 of the engine when the piston 2 of the engine cylinder 17 moves to a preset position, and controlling the actuating mechanism 300 to act according to the opening time and the opening maintaining duration of the valve 3 to realize opening or closing of the valve 3.

The piston position sensor 5 may be a distance sensor, a touch sensor, or the like. Taking a contact sensor as an example, the contact sensor may be disposed on the cylinder head 18 of the engine cylinder 17, and the detection portion of the contact sensor faces the inside of the engine cylinder 17, when the piston 2 of the engine cylinder 17 moves to a preset position, the piston 2 contacts the detection portion of the contact sensor, at this time, the contact sensor sends piston position information of the piston 2 to the control mechanism 9, and when the control mechanism 9 receives the piston position information, it may be determined that the piston 2 of the engine cylinder 17 moves to the preset position. The working principle and the component structure of the contact sensor or the distance sensor can adopt the existing sensors, and the details are not repeated herein.

It should be noted that the preset position of the piston 2 is generally a position where the piston 2 moves to a maximum stroke or a position close to the maximum stroke.

The crankshaft speed sensor 1 is arranged on the crankcase 15, a corresponding sensing part is arranged on the crankshaft 16, and the crankshaft speed sensor 1 is matched with the sensing part to detect the rotating speed of the crankshaft 16. The working principle of the crankshaft speed sensor 1 is the same as that of the existing speed sensor and speed counting sensor and the action process, and the description is omitted here.

The Control mechanism 9 may be a controller with signal receiving, sending and processing functions, or may be an ECU (Electronic Control Unit) of the vehicle itself (also called "driving computer", "on-board computer", etc.). The control mechanism 9 in the present embodiment is preferably the ECU of the vehicle itself.

In the present embodiment, the valve 3 may be an exhaust valve or an intake valve unless otherwise specified.

The engine air distribution system of the embodiment comprises a control mechanism 9, an actuating mechanism 300 and a detection mechanism, wherein the detection mechanism comprises a piston position sensor 5 and a crankshaft speed sensor 1, the piston position sensor 5 is used for detecting piston position information of a piston 2 of an engine cylinder 17, and the crankshaft speed sensor 1 is used for detecting crankshaft speed information. The control mechanism 9 controls the actuator 300 according to the piston position information and the crankshaft rotation speed information, that is, the opening or closing of the valve 3 is controlled by using the piston position information of the position detection mechanism and the crankshaft rotation speed information of the crankshaft rotation speed sensor 1 as parameters, so that the opening or closing of the valve 3 of the engine is selectively and flexibly controlled according to the running state of the engine. Compared with the existing mode that the position information of the piston is judged by mechanisms such as a timing gear, a cam shaft and the like, the piston position sensor 5 is adopted in the embodiment, the structure is simple, and the control is more flexible; and because the piston position of the engine cylinder 17 can directly reflect the state in the combustion chamber of the engine cylinder 17, and the rotating speed of the crankshaft 16 of the engine is combined, the running requirement of the actual engine is better met, the fuel economy of the engine is further improved, and the emission is improved.

The valve 3 of the engine is generally opened in a lifting mode, and at present, as shown in fig. 2, the valve 3 is opened when the valve 3 moves downwards (that is, the valve 3 and an intake hole on the cylinder head 18 form an intake passage), and the valve 3 is closed when the valve 3 moves upwards (that is, the valve 3 seals the intake hole on the cylinder head 18). The valve 3 is typically driven to move downward by the actuator 300, while the upward movement of the valve 3 is typically automatically reset upward by the valve spring 4. The actuator 300 of the present embodiment may be in various forms with respect to the valve 3 of such a conventional general form, and several specific structural forms of the actuator 300 are given below.

First embodiment of the actuator 300: as shown in fig. 2, the actuator 300 includes a hydraulic cylinder 7, a hydraulic oil passage, an electromagnetic valve 8, and a rocker arm 6.

The hydraulic oil path comprises an oil inlet path 13 and an oil outlet path 10, and the oil inlet path 13 is communicated with an oil inlet of the hydraulic cylinder 7; the oil outlet path 10 is communicated with an oil outlet of the hydraulic cylinder 7, the oil outlet path 10 is provided with an electromagnetic valve 8, and the control mechanism 9 controls the electromagnetic valve 8 to be opened or closed according to the opening time and the maintaining opening duration of the valve 3 so as to control the extension of a piston rod of the hydraulic cylinder 7. The middle part of rocking arm 6 is used for rotating to connect on engine cylinder 17, and the first end of rocking arm 6 is used for with valve 3 butt, and the second end of rocking arm 6 is used for being connected with the piston rod of pneumatic cylinder 7, and the flexible rocking arm 6 that can drive of piston rod removes to make the opening or closing of the first end control valve 3 of rocking arm 6.

The hydraulic oil of the hydraulic cylinder 7 is preferably lubricating oil of an engine, specifically, an oil inlet of the oil inlet path 13 is communicated with the main lubricating oil path 14, and oil is fed by using the pressure of the main lubricating oil path 14; an oil outlet of the oil outlet passage 10 communicates with the oil pan 11.

The specific control process is that the inlet valve and the exhaust valve are similar, and the inlet valve is taken as an example for explanation: when the piston 2 moves to a preset position, a control mechanism 9(ECU) determines the opening time and the opening maintaining duration of an intake valve according to the crankshaft speed information of a crankshaft 16 of the engine at the moment; then, the control mechanism 9 controls the electromagnetic valve 8 of the intake valve to close at the opening time of the intake valve, at this time, because the oil inlet path 13 continuously takes oil under the effect of the pressure of the main oil path 14 of the lubricating oil, at this time, the oil outlet path 10 is closed, the pressure in the hydraulic cylinder 7 is increased, the piston rod of the hydraulic cylinder 7 extends outwards and drives the second end forming the rocker arm 6 to move upwards, at this time, the middle part of the rocker arm 6 is rotatably connected to the engine cylinder 17, so the first end of the rocker arm 6 moves downwards to flap the intake valve, and the intake. The solenoid valve 8 is kept in the closed state for the period of the intake valve maintenance opening. When the opening duration of the air inlet valve is reached, the control mechanism 9 controls the electromagnetic valve 8 of the air inlet valve to be opened, and the oil outlet passage 10 starts to discharge oil into the oil pan 11; the pressure of the hydraulic cylinder 7 is reduced, the piston rod retracts, the second end of the rocker arm 6 moves downwards, the second end of the rocker arm 6 is not forced upwards any more, the first end of the rocker arm 6 is jacked up under the action of the valve spring 4, and the valve 3 is closed.

The control mechanism 9 controls the opening or closing of the electromagnetic valve 8, which is realized by controlling an actuating mechanism of the electromagnetic valve 8, and belongs to the conventional control technology of the existing electromagnetic valve, and is not described herein again.

In the mode, the hydraulic oil of the hydraulic cylinder 7 adopts the pressure of lubricating oil of the engine as a power source, an oil storage tank is not required to be additionally arranged, and the structural arrangement is simple. And the electromagnetic valve 8 is used for controlling the on-off of the oil path, so that the hydraulic driving of opening or closing of the intake valve and the exhaust valve is realized. Further, the rocker arm 6 of the existing valve 3 can be used, and the modification of the engine cylinder 17 is not large. Furthermore, the pressure oil in the main oil gallery of the lubricating oil is directly used as a power source, and devices such as an oil pump, an oil rail and the like are not needed to be arranged additionally, so that the structure is simple.

Wherein, as an optimal mode, be provided with pressure limiting valve 12 on the oil inlet way 13, pressure limiting valve 12 can improve the stability of oil feed pressure in oil inlet way 13, guarantees that the oil pressure of the oil inlet of pneumatic cylinder 7 is stable.

Second embodiment of the actuator 300: the actuator 300 comprises a hydraulic cylinder 7, a hydraulic oil circuit and an electromagnetic valve 8, and a piston rod of the hydraulic cylinder 7 is matched with the valve 3. The hydraulic oil path comprises an oil inlet path 13 and an oil outlet path 10, and the oil inlet path 13 is communicated with an oil inlet of the hydraulic cylinder 7 body; the oil outlet path 10 is communicated with an oil outlet of the hydraulic cylinder 7, the oil outlet path 10 is provided with an electromagnetic valve 8, and the controller controls the electromagnetic valve 8 to be opened or closed according to the opening time and the opening maintaining duration of the valve 3, so that the valve 3 is opened or closed.

That is, the second embodiment, compared to the first embodiment, eliminates the rocker arm 6 and directly drives the valve 3 using the piston of the hydraulic cylinder 7. In this embodiment, the operation process of the actuator 300 can be participated in the first embodiment, and still when the electromagnetic valve 8 is closed, the piston rod of the engine cylinder 17 is extended, the valve 3 is moved downward and opened, and when the electromagnetic valve 8 is opened, the piston rod of the engine cylinder 17 is retracted, the difference is that at this time, the piston directly pushes the valve 3 to move downward.

This embodiment firstly has the advantages of the first embodiment and secondly the reduced space occupation of the rear part of the rocker arm 6 is omitted.

Third embodiment of actuator 300: the actuator 300 includes an electromagnetic relay and a rocker arm 6;

the middle part of rocker arm 6 is used for rotating to be connected on engine cylinder 17, and the first end of rocker arm 6 is used for with valve 3 butt, the second end of rocker arm 6 be used for with the electromagnetic relay cooperation. The controller controls the electromagnetic relay to be connected with or disconnected from the second end of the rocker arm 6 according to the opening time and the maintaining opening time of the valve 3, so that the first end of the rocker arm 6 controls the opening or closing of the valve 3.

In this embodiment, the valve 3 is directly driven by the electromagnetic relay without using the hydraulic cylinder 7 as compared with the first embodiment. The structure and the operation principle of the electromagnetic relay refer to the prior conventional art.

The basic components of an electromagnetic relay include a control circuit, an electromagnet, an armature and a return spring, and the implementation of the actuator 300 is realized by using the armature to have two different positions when the electromagnet is powered on and off.

In the specific control process, the intake valve and the exhaust valve are similar, and the intake valve is also taken as an example in the present embodiment, and the example is described as an example in which when the armature is attracted by the electromagnet in the energized state of the electromagnetic relay, the armature abuts against the second end of the rocker arm 6. When the piston moves to a preset position, a control mechanism 9(ECU) determines the opening time and the opening maintaining duration of an intake valve according to the crankshaft speed information of the engine at the moment; then, the control mechanism 9 controls an electromagnetic relay of the air inlet valve to be electrified at the opening time of the air inlet valve, at the moment, an electromagnet adsorbs an armature, the armature pushes the second end of the rocker arm 6 to move upwards, the first end of the rocker arm 6 beats the air inlet valve downwards, and the air inlet valve is opened; the electromagnetic relay maintains the electrified state in the maintaining and opening duration of the inlet valve. When the opening duration of the air inlet valve is maintained, the control mechanism 9 controls the electromagnetic relay to be powered off, the armature is far away from the electromagnet under the action of the reset spring and is separated from the second end of the rocker arm 6, the second end of the rocker arm 6 does not bear upward force any more at the moment, the first end of the rocker arm 6 is jacked up under the action of the valve spring 4, and the valve 3 is closed.

The structure of the implementation mode is simple.

Fourth embodiment of the actuator 300: the actuator 300 comprises an electromagnetic relay cooperating with the valve 3. The controller controls the electromagnetic relay to be connected with or disconnected from the valve 3 according to the opening time and the maintaining opening time of the valve 3 so as to control the opening or closing of the valve 3.

That is, the fourth embodiment is compared with the third embodiment in that the rocker arm 6 is eliminated and the electromagnetic relay acts directly on the valve 3.

The control method of the engine valve timing system in the embodiment of the invention is similar to the control method of confirming the position of the existing piston by adopting the timing gear and the camshaft, and when the control program is actually set, the control method can refer to the existing method of confirming the position of the piston by adopting the timing gear and the camshaft, and specifically comprises the following steps:

step 1: piston position information of a piston 2 of the engine and crankshaft rotational speed information of a crankshaft 16 of the engine are acquired.

The step is that corresponding information is obtained by the piston position sensor 5 and the crankshaft rotation speed sensor 1 and is sent to the ECU.

Step 2: the opening time and the sustained opening period of the intake valve and the opening time and the sustained opening period of the exhaust valve are determined based on the crankshaft rotational speed information of the crankshaft 16 of the engine when the piston 2 moves to the preset position.

This step is realized by the processing of the ECU according to a preset program. The crankshaft speed information should be crankshaft speed information when the piston moves to a preset position, for example, at the time of the first second, the ECU judges that the piston moves to a large preset position according to the piston position information detected by the piston position sensor, and at the moment, the opening time and the opening maintaining duration of the intake valve and the opening time and the opening maintaining duration of the exhaust valve should be determined according to the crankshaft speed information at the time of the first second.

And step 3: the actuator 300 that controls the intake valve opens the intake valve at the opening time of the intake valve and closes the intake valve after the maintenance opening period of the intake valve; the actuator 300 that controls the exhaust valve opens the exhaust valve for the opening time of the exhaust valve and closes the exhaust valve after the maintenance opening period of the exhaust valve.

The step is realized by automatically sending out a control signal by the ECU.

For a specific control process of the actuator 300, reference may be made to the description of the engine valve train. It should be specially noted that the opening time of the valve 3 of the intake valve and the opening time of the valve 3 of the exhaust valve may be the same or different, and correspondingly, the maintaining opening time of the intake valve and the maintaining opening time of the exhaust valve may be the same or different; the specific opening time and the relation between the maintained opening time and the crankshaft rotating speed information can be obtained through actual experience or experiments and actually determined according to different vehicle types. Since the piston 2 of the engine cylinder 17 is intermittently reciprocated during the engine operation, the control of the actuator 300 is performed once each time the piston position detecting means detects the piston. That is, the above process is repeated during the reciprocating movement of the piston.

In the control method of the engine valve timing system of the embodiment, when the piston moves to the preset position, the opening time and the opening maintaining duration of the intake valve and the opening time and the opening maintaining duration of the exhaust valve are determined according to the rotating speed of the crankshaft of the engine, and then the actuating mechanisms 300 of the intake valve and the exhaust valve are respectively controlled according to the opening time and the opening maintaining duration to control the actuating mechanisms 300 to act according to the corresponding opening time and the corresponding opening maintaining duration, so that the opening or the closing of the valve 3 is realized. The engine air distribution method of the embodiment of the invention enables the opening or closing of the valve 3 of the engine to be selectively and flexibly controlled according to the running state of the engine, and compared with a mode of only depending on mechanical control, the control is more flexible; and because the position of the piston 2 of the engine cylinder can directly reflect the state in the combustion chamber of the engine cylinder, the piston reaches the preset position to be used as the reference basis for opening the valve 3, and the rotating speed of the crankshaft of the engine is combined to better meet the running requirement of the actual engine, thereby improving the fuel economy of the engine and improving the emission.

In conclusion, the engine air distribution system in the embodiment of the invention omits components such as the engine timing gear, the camshaft, the tappet, the push rod and the like, reduces the mechanical friction loss and reduces the noise. And the flexible control of the gas distribution phase can be realized by the electromagnetic valve 8 or the electromagnetic relay according to different working conditions of the engine, the fuel economy is further improved, the emission is reduced, and the power performance of the engine is improved.

The embodiment of the invention also provides an engine, which comprises an engine cylinder 17, a crankcase 15 and the engine air distribution system provided by the embodiment of the invention. Wherein, the engine cylinder 17 is provided with a valve 3, the valve 3 is opened or closed by lifting, and the crank shaft 16 of the engine is arranged in the crank case 15; the piston position sensor 5 is provided on a head 18 of the engine cylinder 17, and the crank speed sensor 1 is provided on the crankcase 15.

Specifically, when the actuator 300 includes the hydraulic cylinder 7, the hydraulic oil passage, the solenoid valve 8, and the rocker arm 6, or when the actuator 300 includes the hydraulic cylinder 7, the hydraulic oil passage, and the solenoid valve 8, the hydraulic oil passage is preferably provided in the head 18 of the engine cylinder 17.

The description of the engine air distribution system of the embodiment can be referred to for the component arrangement, the control process and the beneficial effects of the engine of the embodiment of the invention.

The embodiment of the invention also provides a vehicle, which comprises the ECU and the engine gas distribution system provided by the embodiment of the invention; alternatively, it is understood that the vehicle includes the ECU and the engine provided by the embodiment of the invention. The control mechanism 9 of the engine valve timing system is an ECU, namely, a corresponding control program is added on the existing ECU to realize the control.

The description of the engine air distribution system of the embodiment can be referred to for the component arrangement, the control process and the beneficial effects of the vehicle.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.