CN209855921U

CN209855921U - Gas fuel injection device of gas fuel engine

Info

Publication number: CN209855921U
Application number: CN201920016537.5U
Authority: CN
Inventors: 丁顺良; 彭上; 李朋阳; 高建设
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2019-01-07
Filing date: 2019-01-07
Publication date: 2019-12-27
Anticipated expiration: 2029-01-07

Abstract

The utility model provides a gas fuel engine (including double fuel engine and gas engine) gas injection apparatus. The control system consists of a main controller, a CAN bus and a multi-stage gas injection device; the multistage gas injection device comprises a CAN transceiver, an MCU, an electromagnetic valve drive and an electromagnetic valve group, the multistage gas injection device adopts an integrated structure of the CAN transceiver, the MCU, the electromagnetic valve drive and the electromagnetic valve group, and a plurality of independently controlled small-flow electromagnetic valves are arranged in the electromagnetic valve group. The utility model discloses not only can compromise the small flow accurate control of gas when engine start-up and small load operation, can jointly spray the large-traffic requirement of gas when satisfying high load operation through a plurality of small flow solenoid valves in every electromagnetism valves again, can improve the economic nature and the emission performance of engine to compact structure, control is nimble reliable, and anti-interference is strong, reduce cost.

Description

Gas fuel injection device of gas fuel engine

Technical Field

The utility model relates to a gas fuel engine, concretely relates to gas fuel engine's gas injection apparatus.

Background

The development of the alternative fuel of the internal combustion engine is one of the very effective means for realizing energy conservation and emission reduction, and has great effect on solving the increasingly severe petroleum crisis and environmental pollution conditions. The gas fuel (such as natural gas and petroleum gas) has the advantages of clean combustion, large heat value and the like, and particularly, the natural gas is the first choice for replacing the fuel of the future internal combustion engine due to abundant reserves. However, the types of the existing internal combustion engines are various, the model powers are far from each other, when the internal combustion engines are developed or modified into gas fuel engines on the basis of different types of internal combustion engines, the requirements of the equipped gas fuel injectors are greatly different, the corresponding gas fuel injectors cannot be independently configured according to the requirements of different engines, the parameters and the installation positions of the injectors can greatly influence the service performance of the engines, when the fuel injection quantity range with the excessively small injectors cannot meet the power operation requirement of the high power of the engines, particularly when manifold multi-point injection is adopted, the timeliness of gas injection cannot be met; when the fuel injection quantity range of the injector is too large, the fuel quantity of the start-up injection is too large, particularly a high-power diesel engine is matched with a large-flow injector, and when the engine runs at low load, the fuel injection quantity is inaccurate, so that the waste of fuel and the reduction of dynamic property, economy and emission performance are caused; at present, in order to meet the requirement of the fuel gas supply amount of a high-power gas engine, an engine manufacturer or an engine modification unit mostly installs a plurality of small-flow injectors for each cylinder and individually controls each small-flow electromagnetic valve, but the number of the injectors is limited by the structural size of a manifold, installation far away from an air inlet pipe can cause the reduction of variable working condition jet response speed, and the fuel gas supply of the plurality of small-flow injectors to each cylinder can increase the control difficulty and the unreliability of a system, and can also generate electromagnetic interference, thereby causing the unstable operation of the system.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas fuel engine gas injection apparatus for solve and carry out gas fuel engine research and development and reform transform the in-process on the internal-combustion engine basis of different power ranges, the big, the low problem of reliability of the sprayer performance matching problem and the injection control degree of difficulty. The purpose of the utility model is realized like this: a gas fuel injection device of a gas fuel engine comprises a main controller (2), a CAN bus (3), a piston position sensor (10) and at least six groups of multi-stage gas injection devices (4), wherein the main controller (2) consists of a main MCU (1) and a main controller CAN transceiver (9), and the main MCU (1) is connected to the CAN bus (3) through the main controller CAN transceiver (9); the multi-stage gas injection device (4) consists of an electromagnetic valve group (5), an electromagnetic valve driving device (6), a sub-controller MCU (7) and a sub-controller CAN transceiver (8); the electromagnetic valve group (5) is composed of a plurality of independently controlled small-flow electromagnetic valves (A-14), each small-flow electromagnetic valve (A-14) is controlled by an electromagnetic valve driving device (6), the electromagnetic valve driving device (6) is controlled by a sub-controller MCU (7), the sub-controller MCU (7) is connected to a CAN bus (3) through a sub-controller CAN transceiver (8), and the signal output end of a piston position sensor (10) is connected to one signal input end of a main MCU (1).

The working process of the gas injection device of the gas fuel engine comprises the following steps: the control system adopts a distributed control structure, and six secondary MCUs (7) respectively and independently control 6 electromagnetic valve groups (5). During operation, the main controller (2) collects, processes, analyzes and calculates signals of the piston position sensor (10), the main MCU (1) calculates an air supply cylinder, air injection timing and air injection pulse width at the next moment according to the collected information, the CAN transceiver (8) filters the signals and then respectively controls the six multi-stage gas injection devices (4), so that gas supply is carried out on six cylinders of the six-cylinder diesel engine, and the main controller (2) and the multi-stage gas injection devices (4) are communicated through the CAN bus (3).

The beneficial effects of the utility model are mainly embodied in that: 1. the electromagnetic valve groups of the multistage gas injection device are internally provided with the plurality of independently controlled small-flow electromagnetic valves, so that the small-flow accurate control of the gas during the starting and the small-load running of the engine can be considered, the large-flow requirement of the gas during the high-load running can be met by jointly injecting the plurality of small-flow electromagnetic valves in each electromagnetic valve group, and the economy and the emission performance of the engine can be improved. 2. The multi-valve gas injection device adopts an integrated structure, so that the structure is compact and the cost is reduced. 3. The utility model discloses a control system, main control unit are as signal processing and arithmetic unit, and are not on same control panel with solenoid valve drive unit, only link to each other through the CAN bus between the two, CAN reduce the electromagnetic interference that the solenoid valve drive caused main control unit effectively, guarantee the stability of system's work. Because the main controller is only used as a signal processing and arithmetic unit and outputs through the CAN bus, the expansion of the system is convenient, for example, when the number of the multistage gas injection devices is required to be increased, only the software change is required to be carried out on the control system without changing hardware, the cost CAN be reduced, and the market adaptability of the product is improved. 4. All small-flow electromagnetic valves of the whole device CAN be reasonably managed by adopting a distributed control mode, the CAN bus respectively gives signals to the secondary MCUs in a numbering mode, and the signals are still continuously transmitted downwards until the signals are finally received by a certain secondary MCU, so that the normal work of other injection devices cannot be influenced when a single injection device fails, the robustness and the reliability of a system CAN be improved, and the service life of the device is prolonged.

Drawings

Fig. 1 is a schematic diagram of the control system of the present invention.

Fig. 2 is a schematic view of the multi-valve gas injection device of the present invention.

Fig. 3 is a schematic diagram of the distribution of the small-flow solenoid valves in the solenoid valve group of the present invention.

Detailed Description

The first embodiment is as follows: the present embodiment will be specifically described below with reference to fig. 1 to 3. A gas fuel injection device of a gas fuel engine comprises a main controller (2), a CAN bus (3), a piston position sensor (10) and at least six groups of multi-stage gas injection devices (4), wherein the main controller (2) consists of a main MCU (1) and a main controller CAN transceiver (9), and the main MCU (1) is connected to the CAN bus (3) through the main controller CAN transceiver (9); the multi-stage gas injection device (4) consists of an electromagnetic valve group (5), an electromagnetic valve driving device (6), a sub-controller MCU (7) and a sub-controller CAN transceiver (8); the electromagnetic valve group (5), the electromagnetic valve driving device (6), the sub-controller MCU (7) and the sub-controller CAN transceiver (8) adopt an integrated structure; the electromagnetic valve group (5) is composed of a plurality of independently controlled small-flow electromagnetic valves (A-14), each small-flow electromagnetic valve (A-14) is controlled by an electromagnetic valve driving device (6), the electromagnetic valve driving device (6) is controlled by a sub-controller MCU (7), the sub-controller MCU (7) is connected to a CAN bus (3) through a sub-controller CAN transceiver (8), and the signal output end of a piston position sensor (10) is connected to one signal input end of a main MCU (1).

The gas fuel engine takes a six-cylinder engine as an example, and six small-flow electromagnetic valves are arranged in an electromagnetic valve group as an example.

The electromagnetic valve group (5) comprises a lower valve body (A-10), a pressure stabilizing chamber shell (A-13), a lower shell (A-15), an upper shell (A-16) and an upper valve body (A-18), wherein a plurality of independently controlled small-flow electromagnetic valves (A-14) are arranged in the lower valve body (A-10); the lower valve body (A-10) and the upper valve body (A-18) are positioned by adopting rabbets and sealed by a sealing gasket (A-17), the positioning hole (A-4) is positioned in the lower valve body (A-10), the lower valve body (A-10) and the upper valve body (A-16) are assembled and compressed by a bolt (A-3), a bolt (A-5) and a bolt (A-7), and the pressure stabilizing chamber shell (A-13) is connected with the lower valve body (A-10) by threads and sealed by the sealing gasket (A-8). When the electromagnetic coil of the small-flow electromagnetic valve (A-14) is not electrified, the fuel gas is not injected; when the electromagnetic coil of the small-flow electromagnetic valve (A-14) is electrified, the small-flow electromagnetic valve (A-14) is opened, and the fuel gas enters the engine cylinder through the gas rail (A-1), the fuel gas distributor (A-2), the fuel gas channel (A-6), the pressure stabilizing chamber (A-9) and the outlet (A-12). The gasket (A-11) ensures sealing during installation.

The working process of the gas injection device of the gas fuel engine comprises the following steps: the main controller (2) and the sub-controller MCU (7) adopt a distributed control structure through the CAN bus (3), the main controller (2) collects, processes and analyzes signals of the piston position sensor (10), the main MCU (1) calculates an air supply cylinder, air injection timing and air injection pulse width at the next moment according to the collected information, six multi-stage gas injection devices (4) respectively control six cylinders of a six-cylinder diesel engine to supply gas, and the main controller (2) and the multi-stage gas injection devices (4) communicate through the CAN bus (3).

The second embodiment is as follows: the present embodiment will be specifically described below with reference to fig. 1. Compared with the first embodiment, the first embodiment is added with six top dead center position sensors (11), and each top dead center position sensor (11) is connected to one signal input end of one sub-controller MCU (7). With this arrangement, a problem that communication delay may occur is avoided, and injection timing is ensured. One path of top dead center position signal is independently given to the branch controller MCU (7), and the main MCU (1) and the branch controller MCU (7) jointly calculate an air supply cylinder, air injection timing and air injection pulse width at the next moment according to the acquired information.

The third concrete implementation mode: the present embodiment will be specifically described below with reference to fig. 1 to 3. Compared with the first embodiment, the embodiment specifically provides a working flow of the gas injection device of the gas fuel engine: the main controller (2) and the CAN bus filtering functions of the six multi-stage gas injection devices (4) are all opened, because the CAN bus has the ID filtering function, when the system wants to supply gas to a certain cylinder, the serial number of the multi-stage gas injection device (4) corresponding to the cylinder is used as the ID, the control circuit of each multi-stage gas injection device (4) starts filtering after detecting a signal on the CAN bus (3), if the filtering is passed, the following data bit is received, and the control circuits of other multi-stage gas injection devices (4) continue to receive the data until the last one, so that the problem that the system cannot work due to the fact that a single gas injection device fails to send an error signal is avoided, and the identification management and control of the six multi-stage gas injection devices (4) are realized. And after receiving the information, the MCU (7) of the sub-controller of the multi-stage gas injection device (4) analyzes the data bits according to a predefined mode to obtain the gas injection amount and the gas injection time, and further determines the gas injection pulse width and the number of the electromagnetic valves needing to be opened according to the gas injection amount. And further determining which valves are opened according to the service condition of each electromagnetic valve (14), outputting the air injection timing and air injection pulse width of the control electromagnetic valve (A-14) through the electromagnetic valve driving device (6), completing the current injection, and waiting for entering the next working cycle.

Claims

1. A gas injection device of a gas fuel engine is characterized in that: the device comprises a main controller (2), a CAN bus (3), a piston position sensor (10), a top dead center position sensor (11) and at least six groups of multi-stage gas injection devices (4), wherein the main controller (2) consists of a main MCU (1) and a main controller CAN transceiver (9), and the main MCU (1) is connected to the CAN bus (3) through the main controller CAN transceiver (9); the multi-stage gas injection device (4) consists of an electromagnetic valve group (5), an electromagnetic valve driving device (6), a sub-controller MCU (7) and a sub-controller CAN transceiver (8); the electromagnetic valve group (5) is composed of a plurality of independently controlled small-flow electromagnetic valves (A-14), each small-flow electromagnetic valve (A-14) is controlled by an electromagnetic valve driving device (6), the electromagnetic valve driving device (6) is controlled by a sub-controller MCU (7), the sub-controller MCU (7) is connected to a CAN bus (3) through a sub-controller CAN transceiver (8), and the signal output end of a piston position sensor (10) is connected to one signal input end of a main MCU (1).

2. A gas injection apparatus for a gas fuel engine as set forth in claim 1, wherein: the electromagnetic valve group (5), the electromagnetic valve driving device (6), the sub-controller MCU (7) and the sub-controller CAN transceiver (8) adopt an integrated structure.

3. A gas injection apparatus for a gas fuel engine as set forth in claim 1, wherein: the main controller (2) and the sub-controller MCU (7) adopt a distributed control structure through the CAN bus (3).

4. A gas injection apparatus for a gas fuel engine as set forth in claim 1, wherein: a plurality of small-flow electromagnetic valves (A-14) which can be independently controlled are arranged in the electromagnetic valve group (5); the electromagnetic valve (A-14) is connected with the upper valve body and the lower valve body through pipelines; when the electromagnetic coil of the small-flow electromagnetic valve (A-14) is not electrified, the fuel gas is not injected; when the electromagnetic coil of the small-flow electromagnetic valve (A-14) is electrified, the small-flow electromagnetic valve (A-14) is opened, and the fuel gas enters the engine cylinder through the gas rail (A-1), the fuel gas distributor (A-2), the fuel gas channel (A-6), the pressure stabilizing chamber (A-9) and the outlet (A-12).

5. A gas injection apparatus for a gas fuel engine as set forth in claim 1, wherein: six top dead center position sensors (11) are added, and each top dead center position sensor (11) is connected to one signal input end of one sub-controller MCU (7).