CN216207568U

CN216207568U - Multi-performance testing device for high-pressure system of fuel engine

Info

Publication number: CN216207568U
Application number: CN202122936273.5U
Authority: CN
Inventors: 蒋理明
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-27
Filing date: 2021-11-27
Publication date: 2022-04-05
Anticipated expiration: 2031-11-27

Abstract

The utility model relates to a multi-performance test device for a high-pressure system of a fuel engine, which comprises an oil tank, a coarse filter, a high-pressure fine filter, a motor, an oil pump assembly, a common rail assembly and an oil injector assembly, wherein the coarse filter is arranged on the oil tank; the motor is connected with the oil pump assembly; the oil pump assembly comprises an electric control low-pressure oil pump and an electric control high-pressure oil pump. The oil tank is internally provided with a coarse filter, the outlet of the coarse filter is connected with the inlet of an electric control low-pressure oil pump through an oil pipe, the outlet of the electric control low-pressure oil pump is connected with the inlet of a high-pressure fine filter, the outlet of the high-pressure fine filter is connected with the inlet of an electric control high-pressure oil pump, the outlet of the electric control high-pressure oil pump is connected with the inlet of a common rail assembly, and the outlet of the common rail assembly is connected with the inlet of an oil sprayer assembly. The device can test the reliability of key parts in the fuel engine system and verify the result obtained by solving the technical scheme model.

Description

Multi-performance testing device for high-pressure system of fuel engine

Technical Field

The utility model relates to the technical field of fuel engine system testing, in particular to a multi-performance testing device for a high-pressure system of a fuel engine.

Background

With the further acceleration of the technological innovation of the fuel engine, particularly the deep integration of the fields of solving the electric control technology and the technical scheme model and the increasingly deep understanding of people on ecological and environmental protection, the fuel system has novel components such as electronic speed regulation, an electric control monoblock pump, an electric control pump nozzle, an electric control common rail system and the like from the traditional mechanical pump in sequence, so that the fuel system of the diesel engine is developed to a brand new height. The existing common performance test device can only test items such as power, torque, rotating speed, oil consumption, oil pressure, oil temperature and the like, the types of the test items are limited, and the test requirements of a fuel engine system cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-performance test device for a high-pressure system of a fuel engine, which can be used for performing reliability test on key parts in the fuel engine system and verifying a result obtained by solving a technical scheme model.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a multi-performance test device for a high-pressure system of a fuel engine comprises an oil tank, a high-pressure fine filter, a motor, an oil pump assembly, a common rail assembly and an oil injector assembly; the motor is connected with the oil pump assembly; the oil pump assembly comprises an electric control low-pressure oil pump and an electric control high-pressure oil pump.

The oil tank is internally provided with a coarse filter, the outlet of the coarse filter is connected with the inlet of an electric control low-pressure oil pump through an oil pipe, the outlet of the electric control low-pressure oil pump is connected with the inlet of a high-pressure fine filter, the outlet of the high-pressure fine filter is connected with the inlet of an electric control high-pressure oil pump, the outlet of the electric control high-pressure oil pump is connected with the inlet of a common rail assembly, and the outlet of the common rail assembly is connected with the inlet of an oil sprayer assembly.

Further, an oil level indicator is installed on the oil tank.

Furthermore, an overflow valve, an oil temperature sensor, an electromagnetic valve and a throttle valve are arranged on the oil pump assembly.

Further, a pressure sensor, a flow limiter and a pressure limiting valve are mounted on the common rail assembly.

Furthermore, the oil tank, the high-pressure fine filter, the motor, the oil pump assembly, the common rail assembly and the oil injection assembly are all arranged on the supporting frame; the oil pump assembly is arranged on the support frame through a support frame; the motor is connected with the oil pump assembly through a coupler.

Further, the device also comprises an electric control unit.

Furthermore, an air filter is installed at an air inlet of the oil tank.

According to the technical scheme, the reliability test method can be used for not only performing reliability test on key parts in the existing system, but also verifying the processing of each physical quantity by combining with actual conditions, finding out a potential relation building model among a plurality of variables, and then solving the problem to obtain a result, thereby better providing strong data support for technical research and development.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the electronic control unit;

fig. 3 is a schematic diagram of the operation of the electronic control unit.

Wherein:

1. the oil tank comprises an oil tank body, 2, a coarse filter, 3, an oil level gauge, 4, an air filter, 5, an oil pipe, 6, a high-pressure fine filter, 7, a motor, 8, a coupler, 9, a support frame, 10, an oil pump assembly, 11, a high-pressure oil pipe, 12, a common rail assembly, 13, an oil injector assembly, 14, an electronic control unit, 10a, an electronic control low-pressure oil pump, 10b, an overflow valve, 10c, an oil temperature sensor, 10d, an electromagnetic valve, 10e, a throttling valve, 10f, an electronic control high-pressure oil pump, 12a, a pressure sensor, 12b, a flow limiter, 12c and a pressure limiting valve.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

the multi-performance testing device for the high-pressure system of the fuel engine shown in fig. 1-2 comprises a fuel tank 1, a high-pressure fine filter 6, a motor 7, a fuel pump assembly 10, a common rail assembly 12 and a fuel injector assembly 13; the motor 7 is connected with an oil pump assembly 10; the oil pump assembly 10 includes an electrically controlled low-pressure oil pump 10a and an electrically controlled high-pressure oil pump 10 f. The oil pump assembly, the common rail assembly and the oil injector assembly form a high-pressure common rail system.

Install strainer 2 in the oil tank 1, the export of strainer 2 links to each other with the entry of automatically controlled low pressure oil pump 10a through oil pipe 5, and the export of automatically controlled low pressure oil pump 10a links to each other with the entry of high pressure fine filter 6, and the export of high pressure fine filter 6 links to each other with the entry of automatically controlled high pressure oil pump 10f, and the export of automatically controlled high pressure oil pump 10f links to each other with the entry of common rail assembly 12, and the export of common rail assembly 12 links to each other with the entry of sprayer assembly 13.

Further, an oil level gauge 3 is installed on the oil tank 1.

Further, the oil pump assembly 10 is provided with an overflow valve 10b, an oil temperature sensor 10c, an electromagnetic valve 10d and a throttle valve 10 e. The throttle valve 10e is screwed to the electrically controlled low-pressure oil pump. The fuel flows from the electrically controlled low pressure pump through the orifice into the pressure chamber, and when the fuel pressure exceeds, the throttle valve 10e is pushed up and the fuel is delivered to the inlet and outlet valves. The pressure of the pressure chamber is decreased and the throttle valve 10e throttles the fuel passage by the spring force.

Further, the common rail assembly 12 is mounted with a pressure sensor 12a, a flow limiter 12b, and a pressure limiting valve 12 c. Wherein, pressure sensor 12a installs the left end at common rail assembly 12, and pressure sensor 12a links to each other through the external screw thread of its one end and the internal screw thread of common rail assembly left side end. The pressure sensor 12a picks up the fuel pressure inside the common rail, converts the fuel pressure into an electric signal, and transmits the electric signal to the electronic control unit 14. The flow restrictor 12b has a metal housing with external threads at both ends that are screwed into the inlet pipes of the common rail assembly 12 and the injector assembly 13, respectively. The flow restrictor 12b functions to prevent a continuous spray of oil that may occur with the fuel injector assembly. When the amount of oil discharged from the common rail assembly 12 exceeds the maximum flow rate, the flow limiter 12b automatically closes the oil inlet flowing to the corresponding oil injector to prevent oil from being injected continuously. A pressure limiting valve 12c is mounted at the left end of the common rail assembly 12. The pressure limiting valve 12c is connected with the internal thread of the left side end of the common rail assembly 12 through the external thread of one end thereof. The pressure limiting valve 12c returns the fuel to the tank to prevent an abnormal pressure rise when the common rail assembly 12 pressure exceeds a certain value.

Furthermore, the oil tank 1, the high-pressure fine filter 6, the motor 7, the oil pump assembly 10, the common rail assembly 12 and the oil injection assembly 13 are all mounted on the support frame.

Further, the device also comprises an electronic control unit 14. As shown in fig. 2 and 3, information picked up by the electronic control unit connected to various sensors and switches through a wire harness is input to the microprocessor controlling the slave microprocessor according to their internal units. The information content is converted into a driving signal to send a command, and each actuator on the system is controlled. The electric control unit hardware mainly comprises five modules, namely controller hardware signal processing, a micro control unit, a power drive, a power supply module and a communication module. The fuel metering unit driving circuit adopts a BTN960 chip, and the power supply module adopts a reasonably designed protection circuit. The signal processing module adopts a circuit design with unified specification according to the type of signal input. The communication module adopts the CAN bus which is most widely applied at present.

Further, an air filter 4 is installed at an air inlet of the oil tank 1.

The working principle of the utility model is as follows:

when the starting switch is turned on, the motor 7 starts, the motor 7 drives the electric control low-pressure oil pump 10a to suck fuel oil out of the oil tank 1, during the process of sucking fuel oil out of the oil tank 1, coarse filtration is carried out through the coarse filter 2 with a filter screen, then the fuel oil is sent to the high-pressure fine filter 6 through the oil pipe 5 to be subjected to fine filtration, and after the fine filtration in the high-pressure fine filter 6 is finished, the fuel oil is input into the electric control high-pressure oil pump 10 f. In a plunger cavity of the electric control high-pressure oil pump 10f, the fuel oil is pressurized to obtain pressure oil, and the pressure oil is sent to the common rail assembly 12 through the high-pressure oil pipe 11. The pressurized oil from the common rail assembly 12 is injected into the combustion chamber by the injector assembly 13 at a desired injection quantity and at a desired injection start timing under the control of the electronic control unit. By means of improved control of the electronic control unit, the fuel pressurized by the plunger in the common rail system is injected into the respective cylinders of the engine at an optimum fuel injection timing and fuel injection quantity.

The high-pressure oil pipe 11, the common rail assembly 12 and the fuel injector assembly 13 jointly form a common rail system. The common rail assembly 12 stores the pressure oil from the electrically controlled high-pressure oil pump 10f and distributes it to the injector assemblies 13. In response to a signal from the electronic control unit, the injector assembly 13 injects the pressurized oil from the common rail assembly 12 into the combustion chamber of the engine at a desired injection quantity and at a desired injection start timing. When the common rail assembly 12 stores high-pressure fuel, pressure fluctuation generated by fuel supply and fuel injection of the electrically controlled high-pressure fuel pump 10f is buffered by the volume of the common rail assembly. When a large amount of fuel is output, the common rail pressure shared by the cylinders is kept constant, so that the opening time of the fuel injector and the fuel injection pressure can be kept constant. The common rail assembly is also provided with a pressure sensor 12c for measuring the pressure of the common rail, a flow limiter 12b for measuring the flow of the common rail, and a pressure limiting valve 12 a. The flow limiter shuts off the fuel passage to prevent abnormal fuel flow when the nozzle fuel leaks or excessive fuel is injected by the injector. When the common rail pressure exceeds a certain value, the pressure limiting valve returns the fuel to the fuel tank to prevent an abnormal pressure rise.

The electric control system is composed of an electric control unit, various sensors such as an electric control low-pressure pump 10a and an oil temperature 10 c. The electronic control unit adjusts the pressure of the common rail measured by the pressure sensor 12c and the requirement, the fuel oil in the high-pressure common rail passes through the high-pressure oil pipe, and the electronic control unit determines the appropriate oil injection timing and oil injection duration according to the running state of the machine and injects the fuel oil into the cylinder by the electronic oil injector controlled by the electro-hydraulic, so that the consumption of the fuel oil is lower and the output power is higher. An oil inlet metering unit is arranged in the electric control high-pressure oil pump 10f and used for adjusting the high-pressure fuel quantity. The electromagnetic valve 10d is controlled by an electronic control unit, the common rail pressure is controlled by metering the flow of fuel injected into the oil chamber of the electronic control high-pressure oil pump 10f by the electronic control low-pressure pump 10a, and excess fuel returns to the oil tank 1 through the overflow valve 10 b. The common rail assembly is equipped with a pressure sensor 12a capable of transmitting the measured pressure value to the electronic control unit. The high-pressure pump, the pressure sensor and the electric control unit form a closed-loop control circuit of the oil rail pressure. The electronic control unit compares the measured actual value of the rail pressure with a set value according to the rotational speed and the injected fuel quantity of the diesel engine, and adjusts the pumping quantity of the electronically controlled high-pressure pump 10f accordingly so as to keep the rail pressure within a minimum deviation range.

The utility model can be tested as follows:

oil supply efficiency at a certain common rail pressure; the oil supply flow and the oil supply pressure of the high-pressure oil pump; the pressure resistance and the sealing performance of the high-pressure common rail pipe; the relationship between the volume of the high-pressure common rail pipe and rail pressure fluctuation; limiting flow of a high-pressure common rail pipe upper flow limiter; measuring the flow characteristic of the injected fuel quantity by adjusting the control pulse width (injection time) and the injection pressure; measuring the oil injection quantity and the oil return quantity of the high-pressure common-rail oil injector; the results obtained by solving the technical scheme model are tested and verified by the uniformity and the like of the oil sprayer spraying to each cylinder, such as a time pressure control method of a pump-pipe-nozzle type or a pump nozzle, an optimal high-pressure oil pipe pressure stabilizing control method based on difference and the like. The test procedure is in accordance with the requirements of GB/T25367-2010.

The utility model can test the power, torque, rotating speed, oil consumption, oil pressure, oil temperature and other items of the fuel engine, and can also adjust the parameters of main injection pulse width, pilot injection pulse width, oil injection advance angle, main injection pilot injection interval, high-pressure oil pump electromagnetic valve opening pulse width, common rail oil pressure and the like by adopting the existing mode through the electric control system, so that the acquisition becomes convenient, fast and high in precision, the ECU can be calibrated on the test bed, and the characteristics of accurate control of oil injection quantity and continuous multiple injection can be realized. The utility model can also utilize the data comparison of the matched adapter and the built-in various oil injectors, common rail pumps and pump nozzles to check which part of the system has problems. When a system malfunction occurs in the engine and the cause cannot be found, the entire system can be mounted on a test bed, and a problem can be quickly checked out in which portion. In addition, the method also has the advantages that the defects in the model and the codes thereof can be detected and corrected by verifying the result obtained by solving the technical scheme model and combining with corresponding tool software through the designed test case, so that accurate tracking is realized.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. The utility model provides a many performance test device of fuel engine high pressure system which characterized in that: the device comprises an oil tank, a high-pressure fine filter, a motor, an oil pump assembly, a common rail assembly and an oil injector assembly; the motor is connected with the oil pump assembly; the oil pump assembly comprises an electric control low-pressure oil pump and an electric control high-pressure oil pump;

2. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: and an oil level indicator is arranged on the oil tank.

3. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: and the oil pump assembly is provided with an overflow valve, an oil temperature sensor, an electromagnetic valve and a throttle valve.

4. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: and the common rail assembly is provided with a pressure sensor, a flow limiter and a pressure limiting valve.

5. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: the oil tank, the high-pressure fine filter, the motor, the oil pump assembly, the common rail assembly and the oil injection assembly are all arranged on the supporting frame; the oil pump assembly is arranged on the support frame through a support frame; the motor is connected with the oil pump assembly through a coupler.

6. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: the device also includes an electronic control unit.

7. The multi-performance test device for the high-pressure system of the oil engine as recited in claim 1, wherein: and an air filter is arranged at an air inlet of the oil tank.