1. A movable engine starting and loading test rig, comprising:

the testing system comprises a constant hydraulic pump (1) and a pressure limiting valve (8), wherein the constant hydraulic pump (1) is connected with an engine (2) to be tested, and the pressure limiting valve (8) is used for adjusting the output pressure of the constant hydraulic pump (1);

and the feedback system is used for detecting the pressure and the flow of the constant hydraulic pump (1) and adjusting the opening of the pressure limiting valve (8).

2. The movable engine starting and loading test bench of claim 1, characterized in that the feedback system comprises a pressure sensor (7), the pressure sensor (7) being used to detect the pressure of the constant hydraulic pump (1).

3. The mobile engine start and load test rig according to claim 2, wherein the feedback system further comprises a flow meter (9), the flow meter (9) being adapted to detect the flow of the constant hydraulic pump (1).

4. The mobile engine starting and loading test bench according to claim 3, characterized in that the feedback system further comprises a collection control unit (10), the collection control unit (10) being connected with the pressure limiting valve (8), the pressure sensor (7) and the flow meter (9), respectively, the collection control unit (10) being able to regulate the pressure limiting valve (8) according to the pressure and flow of the constant hydraulic pump (1).

5. The movable engine start and load test rig according to claim 1, wherein the test system further comprises a hydraulic oil tank (4), the hydraulic oil tank (4) being adapted to supply hydraulic oil to the constant hydraulic pump (1).

6. The mobile engine starting and loading test bench of claim 5, characterized in that the test system further comprises an overflow valve (11) in communication with the hydraulic oil tank (4), the overflow valve (11) being arranged between the constant hydraulic pump (1) and the pressure limiting valve (8).

7. The movable engine starting and loading test bench of claim 1 further comprising a combination radiator (3), said combination radiator (3) comprising a first radiator for radiating the test system, a second radiator for radiating the air circuit of the engine under test (2), and a third radiator for radiating the air circuit of the engine under test (2).

8. The mobile engine start and load test bench of claim 1 further comprising a fuel tank (5), said fuel tank (5) being used to supply fuel to said engine under test (2).

9. The mobile engine starting and loading test bench of claim 1 further comprising a battery (6), said battery (6) being used to supply power to the starter of the engine under test (2).

10. The movable engine starting and loading test bench according to any of claims 1-9, characterized in that the output of the constant hydraulic pump (1) is connected to the flywheel of the engine under test (2).

Background

The traditional engine test bench comprises an engine to be tested, an engine base, a torque flange, a dynamometer base, a dynamometer control system, a fuel supply system and a cooling system, and a set of complete engine test bench is formed by reasonable arrangement in a test room. In the whole test bench, the components such as a torque flange and a dynamometer are expensive, and the test cost is high. The existing movable engine test bench is usually arranged in a container to form a container test bench, and the container test bench is pulled to a designated test site by a container tractor to carry out engine test work. The movable engine test bench is complex in composition structure and expensive in equipment cost, and a special container for a pull-load test of a special tractor is needed.

Disclosure of Invention

Based on the above problems, the present invention aims to provide a movable engine starting and loading test bench, which does not need expensive components such as a torque flange and a dynamometer, and has low equipment cost.

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

a movable engine start and load test rig comprising:

the testing system comprises a constant hydraulic pump and a pressure limiting valve, wherein the constant hydraulic pump is used for being connected with an engine to be tested, and the pressure limiting valve is used for adjusting the output pressure of the constant hydraulic pump;

and the feedback system is used for detecting the pressure and the flow of the constant hydraulic pump and adjusting the opening of the pressure limiting valve.

As a preferred aspect of the movable engine starting and loading test rig of the present invention, the feedback system includes a pressure sensor for sensing the pressure of the constant hydraulic pump.

As a preferable aspect of the movable engine starting and loading test bench of the present invention, the feedback system further includes a flow meter for detecting a flow rate of the constant hydraulic pump.

As a preferable scheme of the movable engine starting and loading test bench, the feedback system further comprises an acquisition control unit, the acquisition control unit is respectively connected with the pressure limiting valve, the pressure sensor and the flowmeter, and the acquisition control unit can adjust the pressure limiting valve according to the pressure and the flow of the constant hydraulic pump.

As a preferable aspect of the movable engine starting and loading test bench of the present invention, the test system further includes a hydraulic oil tank for supplying hydraulic oil to the constant hydraulic pump.

As a preferred scheme of the movable engine starting and loading test bench, the test system further comprises an overflow valve communicated with the hydraulic oil tank, and the overflow valve is arranged between the constant hydraulic pump and the pressure limiting valve.

The test bench comprises a test system, a movable engine starting and loading test bench, a test system and a combined radiator, wherein the test system comprises a test system, a test system and a test system, the movable engine starting and loading test bench comprises a movable engine starting and loading test bench, the movable engine starting and loading test bench comprises a first radiator, a second radiator and a third radiator, the first radiator is used for radiating the test system, the second radiator is used for radiating a gas circuit of the engine to be tested, and the third radiator is used for radiating a water circuit of the engine to be tested.

The movable engine starting and loading test bench preferably further comprises a fuel tank for supplying fuel to the engine to be tested.

The test bench for starting and loading the movable engine further comprises a storage battery, and the storage battery is used for supplying electric power to the starter of the engine to be tested.

As a preferable scheme of the movable engine starting and loading test bench, the output end of the constant hydraulic pump is connected with a flywheel of the engine to be tested.

The invention has the beneficial effects that:

the movable engine starting and loading test bench provided by the invention can be used for carrying out engine on-load starting performance test, engine loading and unloading rotating speed stability test and other engine performance related tests, the constant hydraulic pump is connected with an engine to be tested, the pressure and the flow of the constant hydraulic pump are detected through the feedback system, the opening of the pressure limiting valve is adjusted, the output pressure of the constant hydraulic pump is adjusted through the pressure limiting valve, namely, the load applied to the engine is changed, and the test power is changed. The movable engine starting and loading test bench provided by the invention has the advantages of strong universality, simple operation, quick installation, convenience in carrying, no need of expensive components such as a torque flange and a dynamometer and the like, low equipment cost, capability of being loaded and transported to a specified test place by a truck after the components are disassembled, and capability of developing related tests by quick assembly.

Drawings

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

FIG. 1 is a schematic diagram of a mobile engine start and load test rig according to an embodiment of the present invention.

In the figure:

1-a constant hydraulic pump; 2-the engine to be tested; 3-a combined radiator; 4-a hydraulic oil tank; 5-a fuel tank; 6-storage battery; 7-a pressure sensor; 8-a pressure limiting valve; 9-a flow meter; 10-an acquisition control unit; 11-overflow valve.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a movable engine starting and loading test bench for performing engine on-load starting performance tests, engine loading and unloading rotational speed stability tests, and other engine performance related tests, the movable engine starting and loading test bench comprising a test system and a feedback system. The testing system comprises a constant hydraulic pump 1 and a pressure limiting valve 8, wherein the constant hydraulic pump 1 is used for being connected with the engine 2 to be tested, and the pressure limiting valve 8 is used for adjusting the output pressure of the constant hydraulic pump 1; the feedback system is used for detecting the pressure and the flow of the constant hydraulic pump 1 and regulating the opening of the pressure limiting valve 8.

The constant hydraulic pump 1 is connected with the engine 2 to be tested, the pressure and the flow of the constant hydraulic pump 1 are detected through a feedback system, the opening degree of the pressure limiting valve 8 is adjusted, the output pressure of the constant hydraulic pump 1 is adjusted through the pressure limiting valve 8, namely, the load applied to the engine is changed, and the test power is changed. The movable engine starting and loading test bench has the advantages of strong universality, simple operation, quick installation, convenient carrying, no need of expensive components such as a torque flange and a dynamometer, low equipment cost, capability of being loaded and transported to a specified test site by a truck after the components are split, and capability of performing related tests by means of quick assembly.

Optionally, the feedback system comprises a pressure sensor 7, the pressure sensor 7 being adapted to detect the pressure of the constant hydraulic pump 1. In the present embodiment, the pressure sensor 7 is provided downstream of the constant hydraulic pump 1 and upstream of the pressure reducing valve. That is, the pressure sensor 7 is used to detect the pressure of the hydraulic oil in the pipeline between the constant hydraulic pump 1 and the pressure reducing valve, and indirectly obtain the pressure of the hydraulic oil of the constant hydraulic pump 1. The pressure sensor 7 works on the principle that pressure directly acts on the diaphragm of the sensor to make the diaphragm generate micro-displacement proportional to the pressure of the medium, so that the resistance of the sensor changes, the change is detected by an electronic circuit, and a standard signal corresponding to the pressure is converted and output.

Optionally, the feedback system further comprises a flow meter 9, and the flow meter 9 is used for detecting the flow rate of the constant hydraulic pump 1. In the present embodiment, the flow meter 9 is provided downstream of the pressure reducing valve. That is, the flow meter 9 is used to detect the flow rate of the hydraulic oil in the line downstream of the pressure reducing valve, and indirectly obtain the flow rate of the constant hydraulic pump 1. The flowmeter 9 can be an electromagnetic flowmeter, which has the following advantages: electromagnetic flow meters can be used to measure industrial conductive liquids or slurries; no pressure loss; the measuring range is large, and the caliber of the electromagnetic flow transmitter is from 2.5mm to 2.6 m; the electromagnetic flowmeter measures the volume flow of the measured fluid in a working state, and the measuring principle does not involve the influence of the temperature, the pressure, the density and the viscosity of the fluid. The flow meter 9 may also be an ultrasonic flow meter, which is a non-contact type measuring instrument and can be used to measure a fluid flow rate and a large-diameter flow rate that are not easy to contact and observe. It does not change the flowing state of the fluid, does not generate pressure loss, and is convenient for installation. The ultrasonic flowmeter can measure the flow of a strong corrosive medium and a non-conductive medium. The ultrasonic flowmeter has a large measuring range, and the pipe diameter range is from 20mm to 5 m. Ultrasonic flow meters can measure various liquid and sewage flows. The volume flow measured by the ultrasonic flowmeter is not affected by thermophysical parameters such as the temperature, pressure, viscosity and density of the measured fluid. The ultrasonic flowmeter can be made into a fixed type and a portable type.

Optionally, the feedback system further includes an acquisition control unit 10, the acquisition control unit 10 is respectively connected with the pressure limiting valve 8, the pressure sensor 7 and the flowmeter 9, and the acquisition control unit 10 can adjust the pressure limiting valve 8 according to the pressure and the flow of the constant hydraulic pump 1. The acquisition control unit 10 can be respectively connected with the pressure limiting valve 8, the pressure sensor 7 and the flowmeter 9 in a wired or wireless communication mode to complete signal transmission. Through pressure and flow feedback, the output pressure of the constant hydraulic pump 1 is calibrated in real time, and more accurate test is realized.

The test system may further comprise a hydraulic oil tank 4, the hydraulic oil tank 4 being adapted to supply hydraulic oil to the constant hydraulic pump 1. In order to improve the safety performance of the test system, the test system can further comprise an overflow valve 11 communicated with the hydraulic oil tank 4, the overflow valve 11 is arranged between the constant hydraulic pump 1 and the pressure limiting valve 8, when the pressure of hydraulic oil in a pipeline is too large, a part of hydraulic oil flows back to the hydraulic oil tank 4 through the overflow valve 11, the pressure of the hydraulic oil in the pipeline can be reduced in time, and the safety of the system is ensured.

In order to improve the heat dissipation performance and facilitate assembly and carrying, the movable engine starting and loading test bench can further comprise a combined radiator 3, the combined radiator 3 comprises a first radiator, a second radiator and a third radiator, the first radiator is used for radiating a test system, the second radiator is used for radiating the air circuit of the engine 2 to be tested, and the third radiator is used for radiating the water circuit of the engine 2 to be tested. Because the hydraulic oil in the test system does work and can generate heat, the temperature of the hydraulic oil is increased, the temperature of the hydraulic oil in the system can be effectively reduced through the first radiator, and the test system is prevented from influencing the performance of the test system due to overhigh oil temperature. Because the atmospheric pressure in the engine 2 that awaits measuring compresses tightly the production of heat, makes the air temperature rise in the gas circuit, can effectively reduce temperature through the second radiator, prevents that the engine 2 that awaits measuring from influencing its performance because of the high temperature. Because the heat exchange of the cooling liquid in the engine 2 to be tested can generate heat, the temperature of water in the cooling pipeline is increased, the water temperature can be effectively reduced through the third radiator, and the influence of the overhigh water temperature on the performance of the engine 2 to be tested is prevented.

The mobile engine starting and loading test rig may further comprise a fuel tank 5, the fuel tank 5 being adapted to supply fuel to the engine 2 under test. The movable engine starting and loading test bench can further comprise a storage battery 6, wherein the storage battery 6 is used for supplying power to the starter of the engine 2 to be tested, and the starter can run normally when the engine is started conveniently. In order to improve the transmission efficiency, optionally, the output end of the constant hydraulic pump 1 is connected with a flywheel of the engine 2 to be tested.

The movable engine starting and loading test bench provided by the embodiment has the advantages of strong universality, simplicity in operation, rapidness in installation, convenience in carrying, no need of expensive components such as a torque flange and a dynamometer, low equipment cost, capability of being loaded and transported to a specified test site by a truck after the components are disassembled, and capability of performing related tests by means of rapid assembly.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.