CN215333081U

CN215333081U - Engine coolant flow control system and test bench

Info

Publication number: CN215333081U
Application number: CN202121132827.XU
Authority: CN
Inventors: 董效彬; 李鑫; 王平; 王炳刚; 郭利升; 韩俊楠
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-12-28
Anticipated expiration: 2031-05-25

Abstract

The utility model belongs to the technical field of engine testing, and particularly relates to an engine coolant flow adjusting system and a test bench. One end of the first circulation branch is communicated with the water outlet of the engine, and the other end of the first circulation branch is communicated with the water inlet of the water pump of the engine; the second circulation branch is connected in parallel with the first circulation branch and comprises a variable frequency water pump and a heat exchanger, the variable frequency water pump is used for adjusting the flow of cooling liquid of the second circulation branch, and the heat exchanger is connected with an external circulation water path; one end of the thermostat is communicated with a water outlet of the engine, and the other end of the thermostat is communicated with the first circulating branch and the second circulating branch; the controller is used for controlling the rotating speed of the variable-frequency water pump. The engine coolant flow regulating system can carry out stepless regulation on the coolant circulating flow, and meets the requirement of engine testing; the test bench can comprehensively simulate the real working condition of the engine on the whole vehicle, has simple structure, easy operation and accurate test result, and does not damage the engine.

Description

Engine coolant flow control system and test bench

Technical Field

The utility model relates to the technical field of engine testing, in particular to an engine coolant flow adjusting system and a test bench.

Background

In the engine development stage, in order to verify that the design target is achieved, parameters such as actual dynamic performance and economical efficiency of the engine need to be tested, and the test is usually carried out on an engine test bench. In the process of an engine bench test, the temperature of engine coolant is difficult to control by directly adopting an automobile water tank radiator, because the automobile water tank radiator is air-cooled on a vehicle, and a device for simulating the speed and the wind speed is difficult to arrange in the limited space force of an engine test room. At present, the temperature control device of engine coolant with a water-cooled heat exchanger is widely adopted in the industry to replace a radiator of an automobile water tank. In the engine coolant temperature control device, the water-cooling heat exchanger has smaller volume, larger flow resistance and longer pipeline, so the external circulation resistance of the engine is larger than the external circulation resistance of the automobile, and the flow of the engine coolant cannot reach the designed value and cannot be adjusted. For an engine cooling system, besides the influence of water temperature on the engine cooling system, the circulation flow of engine coolant is also an important control parameter, the circulation flow of the engine coolant is important for the performance and the abrasion of engine parts, and the insufficient circulation flow of the engine coolant can cause local overheating of the engine, boiling of the coolant, poor heat exchange effect, uncontrollable water temperature and the like, aggravate corrosion of the parts, shortened service life of the parts and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an engine coolant circulation flow regulating system and a test bed, wherein the engine coolant flow regulating system can carry out stepless regulation on the coolant flow of an engine, and meets the requirements of engine tests on the flow and the temperature of the coolant; the test bench can comprehensively simulate the real working condition of the engine on the whole vehicle, has simple structure, easy operation and accurate test result, and does not damage the engine.

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

in one aspect, an engine coolant flow regulation system is provided, comprising:

one end of the first circulation branch is communicated with a water outlet of the engine, and the other end of the first circulation branch is communicated with a water inlet of a water pump of the engine;

the second circulation branch is connected in parallel with the first circulation branch and comprises a variable frequency water pump and a heat exchanger, the variable frequency water pump is configured to adjust the flow of the cooling liquid of the second circulation branch, and the heat exchanger is connected with an external circulation water path;

the thermostat is provided with one end communicated with a water outlet of the engine and the other end communicated with the first circulation branch and the second circulation branch, and is configured to regulate the flow of the cooling liquid flowing through the first circulation branch and the second circulation branch; and

a controller communicatively coupled to the variable frequency water pump, the controller configured to control a rotational speed of the variable frequency water pump.

As a preferable structure of the present invention, the second circulation branch further includes a flow meter, and the flow meter is connected to a water outlet of the variable frequency water pump.

As a preferred structure of the present invention, the controller is communicatively connected to the flow meter, and the flow meter feeds back flow data to the controller.

As a preferable structure of the present invention, the external circulation water path includes a proportional valve configured to adjust a flow rate of the coolant in the external circulation water path.

In a preferred configuration of the present invention, the controller is communicatively connected to the proportional valve, and the controller is configured to control the proportional valve.

As a preferable structure of the present invention, the second circulation branch further includes a first temperature sensor and a first pressure sensor, and the first temperature sensor and the first pressure sensor are disposed between the thermostat and the heat exchanger; the first temperature sensor is used for measuring the water outlet temperature of the engine, and the first pressure sensor is used for measuring the water outlet pressure of the engine.

As a preferable structure of the present invention, the second circulation branch further includes a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are disposed between the flow meter and the engine water pump; the second temperature sensor is used for measuring the water inlet temperature of the engine, and the second pressure sensor is used for measuring the water inlet pressure of the engine.

As a preferable structure of the utility model, the engine comprises an engine cylinder cover, and a water outlet of the engine cylinder cover is communicated with the thermostat.

The engine water inlet device is characterized by further comprising an expansion water tank, wherein one end of the expansion water tank is communicated with a water inlet of the engine, and the other end of the expansion water tank is communicated with a water outlet of the engine cylinder cover.

In another aspect, a test rig is provided that includes the engine coolant flow regulation system described above.

The utility model has the beneficial effects that: the engine coolant flow regulating system comprises a first circulation branch and a second circulation branch, wherein coolant passing through the second circulation branch can be cooled through a heat exchanger, so that the working requirement of an engine is met; the thermostat is convenient for controlling the cooling liquid to flow through the first circulation branch or the second circulation branch, so that the water inlet temperature of the engine is controlled; the flow regulation of the second circulation branch is realized by controlling the rotating speed of the variable frequency water pump through the controller, so that the variable frequency water pump is matched with the flow requirements of cooling liquid in different states of starting, normal working and the like of the engine to carry out stepless rotating speed regulation, the test requirements of the engine are met, and the damage to the engine in the test process is avoided.

Drawings

FIG. 1 is a schematic diagram of an engine coolant flow regulation system provided by an embodiment of the present invention.

In the figure:

1. an engine water pump; 11. a first temperature sensor; 12. a first pressure sensor; 13. a second temperature sensor; 14. a second pressure sensor; 2. a variable frequency water pump; 3. a heat exchanger; 4. a thermostat; 5. a controller; 6. a flow meter; 7. a proportional valve; 8. an expansion tank;

100. an engine; 101. an engine cylinder head.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, an embodiment of the present invention provides an engine coolant flow rate adjustment system, which includes a first circulation branch, a second circulation branch, a thermostat 4, and a controller 5. One end of the first circulation branch is communicated with a water outlet of the engine 100, and the other end of the first circulation branch is communicated with a water inlet of the engine water pump 1. The second circulation branch is connected in parallel with the first circulation branch and comprises a variable frequency water pump 2 and a heat exchanger 3, the variable frequency water pump 2 is configured to adjust the flow of the cooling liquid of the second circulation branch, and the heat exchanger 3 is connected with an external circulation water path; when the coolant passes through the second circulation branch, the heat exchanger 3 can cool the coolant to meet the working requirement of the engine 100. The variable frequency water pump 2 increases the water inlet pressure of the engine 100 in the second circulation branch, makes up the pressure drop of the heat exchanger 3 and the pipeline, and improves the circulation flow, so that the circulation flow of the cooling liquid passing through the engine 100 is the same as the working condition of the whole vehicle. One end of the thermostat 4 is communicated with a water outlet of the engine 100, and the other end of the thermostat is communicated with the first circulation branch and the second circulation branch; through thermostat 4, the coolant can be controlled to flow through first circulation branch or second circulation branch, and the temperature of the inlet water of engine 100 is convenient to control. The controller 5 is in communication connection with the variable frequency water pump 2, and the controller 5 is configured to control the rotating speed of the variable frequency water pump 2, so that the flow regulation of the variable frequency water pump 2 on the second circulation branch is realized, the variable frequency water pump 2 is made to perform stepless regulation in cooperation with the cooling liquid flow requirements of different states of starting, normal working and the like of the engine 100, the test requirement of the engine 100 is met, and the damage to the engine 100 in the test process is avoided.

Further, the second circulation branch also comprises a flow meter 6, and the flow meter 6 is connected to a water outlet of the variable frequency water pump 2; the controller 5 is in communication with the flow meter 6, and the flow meter 6 feeds back flow data to the controller 5. The flow meter 6 is used for measuring the flow of the second circulation branch and feeding data back to the controller 5, so that the controller 5 can control the rotating speed of the variable frequency water pump 2 according to the working condition of the engine 100.

Further, the external circulation water circuit includes a proportional valve 7, the proportional valve 7 is configured to regulate the flow rate of the coolant of the external circulation water circuit; the controller 5 is communicatively connected to the proportional valve 7, and the controller 5 is configured to control the proportional valve 7. The proportional valve 7 is used for controlling the flow of the coolant in the external circulation water path, so as to adjust the cooling capacity of the heat exchanger 3 and realize the control of the outlet water temperature of the engine 100.

Further, the second circulation branch also comprises a first temperature sensor 11 and a first pressure sensor 12, and the first temperature sensor 11 and the first pressure sensor 12 are arranged between the thermostat 4 and the heat exchanger 3; the first temperature sensor 11 is used for measuring the outlet water temperature of the engine 100, and the first pressure sensor 12 is used for measuring the outlet water pressure of the engine 100.

Further, the second circulation branch also comprises a second temperature sensor 13 and a second pressure sensor 14, and the second temperature sensor 13 and the second pressure sensor 14 are arranged between the flow meter 6 and the engine water pump 1; the second temperature sensor 13 is used to measure the temperature of the intake water of the engine 100, and the second pressure sensor 14 is used to measure the pressure of the intake water of the engine 100.

Further, the engine 100 comprises an engine cylinder head 101, and a water outlet of the engine cylinder head 101 is communicated with the thermostat 4. In this way, in the first circulation branch, the engine water pump 1 is connected to the water inlet of the engine 100, and then is communicated with the thermostat 4 through the water outlet of the engine cylinder head 101.

Further, the expansion water tank 8 is further included, one end of the expansion water tank 8 is communicated with a water inlet of the engine 100, and the other end of the expansion water tank 8 is communicated with a water outlet of the engine cylinder cover 101, so that the cooling liquid is provided for the circulation branch.

The working process of the engine coolant flow regulating system of the embodiment is as follows: 1. starting the engine 100, when the temperature of the outlet water of the engine 100 is lower than the opening temperature of the thermostat 4, the first circulation branch works, and the resistance cannot change because no external pipeline is arranged, so that the circulation flow does not need to be adjusted; 2. when the water temperature of the engine 100 is higher than the opening temperature of the thermostat 4 and lower than the full opening temperature of the thermostat 4, the thermostat 4 is in a half-open state, the first circulation branch and the second circulation branch are simultaneously opened, and the state is a heat engine state at the moment, and the flow of the cooling liquid does not need to be controlled by the variable frequency water pump 2; 3. when the outlet water temperature of the engine 100 is higher than the full-open temperature of the thermostat 4, the first circulation branch is closed, the second circulation branch is opened, the cooling liquid forcibly flows through the second circulation branch, and the resistance is larger because the resistance of the heat exchanger 3 connected in series with the second circulation branch is larger than that of a radiator on the whole vehicle and the added pipeline is longer than that of the whole vehicle; at this time, the water inlet pressure of the engine 100 can be increased by adjusting the rotation speed of the variable frequency water pump 2, so that the circulation flow of the coolant of the engine 100 is increased.

The embodiment of the utility model also provides a test bed, which comprises the engine coolant flow regulating system; the regulating system can regulate the circulating flow of the cooling liquid of the engine 100, simulate the real working condition of the engine 100 and meet the test requirement of the engine 100. The test bench of this embodiment can adopt three kinds of methods to realize coolant liquid circulation flow through variable frequency water pump 2 and adjust:

according to a circulation flow MAP diagram of a whole vehicle, the rotating speed of the variable frequency water pump 2 is automatically adjusted through the controller 5, so that the circulation flow of the engine 100 on a test bench is equal to the circulation flow of the engine 100 on each working condition of the whole vehicle, and the engine 100 is tested;

secondly, the engine 100 is in a rated point working condition, the rotating speed of the variable frequency water pump 2 is adjusted, the circulating flow of the engine 100 is equal to the circulating flow of the whole vehicle, the rotating speed of the variable frequency water pump 2 is fixed, and the engine 100 is tested;

and thirdly, enabling the engine 100 to be in a rated point working condition, adjusting the rotating speed of the variable frequency water pump 2 to enable the circulating flow of the engine 100 to be equal to the circulating flow of the whole vehicle, reading the water inlet pressure of the second pressure sensor 14, fixing the water inlet pressure in the controller 5, and testing the engine 100.

The adjusting method is various, operators can select different methods to adjust and test according to the test requirements of the engine 100, the operation is convenient, and the engine 100 is not damaged in the test process.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An engine coolant flow regulation system, comprising:

one end of the first circulation branch is communicated with a water outlet of the engine (100), and the other end of the first circulation branch is communicated with a water inlet of the engine water pump (1);

the second circulation branch is connected with the first circulation branch in parallel and comprises a variable frequency water pump (2) and a heat exchanger (3), the variable frequency water pump (2) is configured to adjust the flow of the cooling liquid of the second circulation branch, and the heat exchanger (3) is connected with an external circulation water path;

a thermostat (4), one end of the thermostat (4) is communicated with a water outlet of the engine (100), and the other end of the thermostat is communicated with the first circulation branch and the second circulation branch, and the thermostat (4) is configured to regulate the flow of the cooling liquid flowing through the first circulation branch and the second circulation branch; and

a controller (5), the controller (5) being communicatively connected to the variable frequency water pump (2), the controller (5) being configured to control a rotational speed of the variable frequency water pump (2).

2. The engine coolant flow regulation system of claim 1, characterized in that the second circulation branch further comprises a flow meter (6), the flow meter (6) being connected to an outlet of the variable frequency water pump (2).

3. The engine coolant flow regulation system of claim 2, wherein the controller (5) is communicatively coupled to the flow meter (6), and the flow meter (6) feeds flow data back to the controller (5).

4. The engine coolant flow regulation system of claim 1, characterized in that the external circulation water circuit includes a proportional valve (7), the proportional valve (7) being configured to regulate the coolant flow of the external circulation water circuit.

5. The engine coolant flow regulation system of claim 4, wherein the controller (5) is communicatively connected to the proportional valve (7), the controller (5) being configured to control the proportional valve (7).

6. The engine coolant flow regulation system of claim 1, characterized in that the second circulation branch further comprises a first temperature sensor (11) and a first pressure sensor (12), the first temperature sensor (11) and the first pressure sensor (12) being disposed between the thermostat (4) and the heat exchanger (3); the first temperature sensor (11) is used for measuring the water outlet temperature of the engine (100), and the first pressure sensor (12) is used for measuring the water outlet pressure of the engine (100).

7. The engine coolant flow regulation system according to claim 2, characterized in that the second circulation branch further includes a second temperature sensor (13) and a second pressure sensor (14), the second temperature sensor (13) and the second pressure sensor (14) being provided between the flow meter (6) and the engine water pump (1); the second temperature sensor (13) is used for measuring the water inlet temperature of the engine (100), and the second pressure sensor (14) is used for measuring the water inlet pressure of the engine (100).

8. The engine coolant flow regulation system of claim 1, characterized in that the engine (100) comprises an engine head (101), and a water outlet of the engine head (101) communicates with the thermostat (4).

9. The engine coolant flow regulation system of claim 8, further comprising an expansion tank (8), wherein one end of the expansion tank (8) is communicated with a water inlet of the engine (100), and the other end is communicated with a water outlet of the engine cylinder head (101).

10. A test rig comprising the engine coolant flow regulation system of any one of claims 1-9.