Cooling water circulation temperature control system in engine pedestal

Abstract

The utility model discloses a cold water circulation temperature control system in an engine pedestal, which comprises an intercooler, an engine communicated with an air path of the intercooler through a connecting pipeline, and a water circulation pipeline connected to a water path of the intercooler, the water circulation pipeline comprises a heat exchanger, a proportional valve, a water pump connected between a primary side water outlet of the heat exchanger and a water inlet of the proportional valve, and a temperature sensor connected to a pipeline of a water outlet of the intercooler and a secondary side water inlet of the heat exchanger. A first water outlet of the proportional valve is connected with a water inlet of the intercooler, and a heater is connected between a second water outlet of the proportional valve and the water inlet of the intercooler; the temperature sensor, the heater and the proportional valve are all connected to the control circuit. And the temperature control precision is high and the adaptability is strong.

Description

Technical Field

[0001] This utility model relates to the field of cooling water circulation technology in engine test benches, and in particular to a cooling water circulation temperature control system for engine test benches. Background Technology

[0002] In engine bench testing, temperature control of the intercooler cooling circulation system is a crucial step in ensuring the accuracy of test data and evaluating engine performance. Current engine bench testing methods employ an intercooler and a circulating water pump for the intercooler cooling circulation. The engine's intake and exhaust ends are connected to the intercooler's exhaust and intake ends, respectively. Cooling water at 10°C circulates through the intercooler's inlet pipe under the action of the circulating water pump. Alternatively, the "A Cooling Circulation Device for an Intercooler of a Turbocharged Direct Injection Engine" disclosed in application number 202221436186.1 can be used.

[0003] However, the existing structure has the following problems:

[0004] 1. Because the inlet water temperature of the intercooler is fixed, it is impossible to achieve precise temperature control through flow rate or heat compensation. This results in a large fluctuation range in the air temperature entering the engine after intercooling, which can reach ±3℃ to ±5℃, and cannot meet the ±1℃ accuracy.

[0005] 2. Poor adaptability and lack of dynamic adjustment capability. When the ambient temperature or engine load changes suddenly, such as in high-temperature conditions or rapid acceleration, the temperature regulation is lagging and frequent manual intervention is required. Utility Model Content

[0006] To overcome the shortcomings of existing technologies in terms of low accuracy and poor adaptability in engine temperature control, a cooling water circulation temperature control system for an engine test bench is provided.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] This utility model provides an intercooler water circulation temperature control system for an engine bench, including an intercooler, an engine connected to the intercooler via a connecting pipe, and a water circulation pipe connected to the intercooler. The water circulation pipe includes a heat exchanger, a proportional valve, a water pump connected between the primary outlet of the heat exchanger and the inlet of the proportional valve, and a temperature sensor connected between the intercooler outlet and the secondary inlet of the heat exchanger. The first outlet of the proportional valve is connected to the intercooler inlet, and a heater is connected between the second outlet of the proportional valve and the intercooler inlet.

[0009] The temperature sensor, heater, and proportional valve are all connected to the control circuit.

[0010] In one possible design, a manual valve is installed on the connecting pipe between the intercooler inlet and the primary side outlet of the heat exchanger.

[0011] In one possible design, a pressure sensor is installed on the pipe of the intercooler inlet, and the pressure sensor is connected to the control circuit.

[0012] This utility model has the following advantages:

[0013] 1. In this solution, the primary side chilled water of the heat exchanger is directly connected to the intercooler via a proportional valve on the water circulation pipeline of the intercooler, and another part is connected to the intercooler via a heater. The opening degree of the proportional valve and the power of the heater can be adjusted through temperature feedback from the temperature sensor, thereby achieving precise temperature control. Compared with the existing technology, its temperature control accuracy is greatly improved.

[0014] 2. This solution uses a temperature sensor installed at the intercooler outlet to monitor the temperature in real time. The opening of the proportional valve is adjusted according to the real-time temperature to achieve temperature regulation. It has strong adaptability, fast temperature regulation response, and reduces the impact of sudden changes in ambient temperature or engine load on the test. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the principle of the present invention.

[0017] Figure 2 This is the circuit diagram for the heater and water pump section;

[0018] Figure 3 This is the circuit diagram of a proportional valve;

[0019] Figure 4 This is the circuit diagram of the heater. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] To improve the temperature control accuracy of engine testing, such as Figure 1As shown, this utility model provides an intercooler water circulation temperature control system for an engine bench. Specifically, the system includes an intercooler 1, an engine connected to the intercooler 1 via a connecting pipe, and a water circulation pipe connected to the intercooler 1. The water circulation pipe includes a heat exchanger 7, a proportional valve 5, a water pump 6 connected between the primary outlet of the heat exchanger 7 and the inlet of the proportional valve 5, and a temperature sensor 2 connected between the outlet of the intercooler 1 and the secondary inlet of the heat exchanger 7. The first outlet of the proportional valve 5 is connected to the inlet of the intercooler 1, and a heater 4 is connected between the second outlet of the proportional valve 5 and the inlet of the intercooler 1. The temperature sensor 2, the heater 4, and the proportional valve 5 are all connected to the control circuit.

[0027] The water pump 6 serves as the power source for maintaining the circulation of coolant and ensuring a stable flow rate; the proportional valve 5 adjusts the water supply ratio between the cold water branch and the heater branch.

[0028] Using the above system, the primary side chilled water of the heat exchanger in the water circulation pipeline of the intercooler is directly connected to the intercooler via a proportional valve, and another part is connected to the intercooler via a heater. The opening degree of the proportional valve and the power of the heater can be adjusted by the temperature feedback of the temperature sensor, which not only expands the temperature regulation range, but also achieves precise control of the inlet temperature of the intercooler.

[0029] The above system monitors the temperature in real time by installing a temperature sensor at the outlet of the intercooler. The temperature is then adjusted according to the real-time temperature, thereby regulating the opening of the proportional valve and the power of the heater. This system is highly adaptable, has a fast temperature regulation response, and reduces the impact of sudden changes in ambient temperature or engine load on the test.

[0030] By using the above system, the heat of the hot water from the intercooler is utilized through a heat exchanger in the water circuit, thereby improving energy efficiency.

[0031] A manual valve 3 is installed on the connecting pipeline between the inlet of the intercooler 1 and the primary side outlet of the heat exchanger 7. The branch where the manual valve is located serves as a bypass, providing auxiliary support to the proportional valve and the heat exchanger.

[0032] A pressure sensor is installed on the pipe at the inlet of the intercooler 1, and the pressure sensor is connected to the control circuit.

[0033] Pressure sensors are used to monitor the pressure inside the pipeline. When the pressure is too high, an alarm is triggered and pressure relief measures are taken to improve the safety of the system.

[0034] The water supply for heat exchanger 7 is preferably the same as in the existing method, using 10℃ cold water. Therefore, the primary side inlet of heat exchanger 7 is connected to the outlet of the 10℃ cold water supply equipment, and the secondary side outlet of heat exchanger 7 is connected to the inlet of the 10℃ cold water supply equipment. With this structure, the 10℃ cold water supply equipment - primary side of the heat exchanger - water pump - proportional valve - intercooler - secondary side of the heat exchanger - 10℃ cold water supply equipment form a closed loop.

[0035] Based on the above structure, a ball valve and a filter are connected between the primary side inlet of heat exchanger 7 and the outlet of the 10℃ cold water supply equipment. The ball valve can be a manual ball valve, such as DN25; the filter can be a 20 to 40 mesh Y-type filter to prevent impurities from clogging it.

[0036] Based on the above structure, in order to improve the rapid switching in case of failure, the heater and heat exchanger of this solution realize dual-branch switching. Specifically, the proportional valve is connected to the heater through the first three-way pipe, and the outlet of the heater is connected to the inlet of the intercooler through the second three-way pipe. The outlet and inlet of the 10℃ cold water supply equipment are redundantly provided with interfaces for connection to the heat exchanger. The water pump 6 is connected to the primary side outlet of the heat exchanger 7 through the third three-way pipe, and the inlet of the intercooler 1 is connected to the secondary side inlet of the heat exchanger 7 through the fourth three-way pipe.

[0037] A T-junction is used to connect the water circuits. When the heater and heat exchanger are functioning properly, one end of the T-junction is not closed. If the heater and / or heat exchanger fails, a new heater and / or heat exchanger can be connected to the closed end, enabling rapid switching between fault states. A dual-branch redundancy configuration ensures system availability of 99.9%.

[0038] By using the above system and coordinating cold and heat sources, the amount of cold water used can be greatly reduced, resulting in energy savings of ≥25%.

[0039] To better demonstrate the technical advantages of this solution, for example, the following method is adopted. Figure 1 The system structure shown, compared with the existing structure that only uses an intercooler and a circulating water pump, was bench tested and its temperature control accuracy was improved from ±3℃ to ±0.3℃, and its coefficient of performance (COP) was improved from 2.5 to 4.2, an improvement of 68%.

[0040] To facilitate system control, water pumps and heat exchangers can also be connected to the control circuit, providing the hardware foundation for the intelligent control system. There are many ways to implement the circuit structure using the above system architecture. For example, please refer to... Figures 2 to 4 ,in, Figure 2 This is the circuit diagram for the heater and water pump section; Figure 3 This is the circuit diagram of a proportional valve; Figure 4This is the circuit diagram of the heater. The remaining circuits of the system are not shown and can be implemented using existing mature technologies, so they will not be described in detail here.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An engine bench intercooler water circulation temperature control system, comprising an intercooler (1), an engine connected to the intercooler (1) via a connecting pipe, and a water circulation pipe connected to the intercooler (1), characterized in that, The water circulation pipeline includes a heat exchanger (7), a proportional valve (5), a water pump (6) connected between the primary outlet of the heat exchanger (7) and the inlet of the proportional valve (5), and a temperature sensor (2) connected between the outlet of the intercooler (1) and the secondary inlet of the heat exchanger (7). The first outlet of the proportional valve (5) is connected to the inlet of the intercooler (1), and a heater (4) is connected between the second outlet of the proportional valve (5) and the inlet of the intercooler (1). The temperature sensor (2), heater (4) and proportional valve (5) are all connected to the control circuit.

2. The engine stand cold water circulation temperature control system of claim 1, wherein: A manual valve (3) is installed on the connecting pipeline between the inlet of the intercooler (1) and the primary outlet of the heat exchanger (7).

3. The engine stand cold water circulation temperature control system of claim 1, wherein: A pressure sensor is installed on the pipeline of the inlet of the intercooler (1), and the pressure sensor is connected to the control circuit.

4. The engine stand cold water circulation temperature control system of claim 1, wherein: The primary inlet of the heat exchanger (7) is connected to the outlet of the 10℃ cold water supply equipment, and the secondary outlet of the heat exchanger (7) is connected to the inlet of the 10℃ cold water supply equipment.

5. The engine stand cold water circulation temperature control system of claim 4, wherein: A ball valve and a filter are connected between the primary inlet of the heat exchanger (7) and the outlet of the 10°C cold water supply equipment.

6. The engine stand cold water circulation temperature control system of claim 4, wherein: The proportional valve is connected to the heater through a first three-way pipe, and the outlet of the heater is connected to the inlet of the intercooler through a second three-way pipe. The outlet and inlet of the 10℃ cold water supply equipment are redundantly provided with interfaces for connecting to the heat exchanger. The water pump (6) is connected to the primary outlet of the heat exchanger (7) through the third three-way pipe. The inlet of the intercooler (1) is connected to the secondary inlet of the heat exchanger (7) through the fourth three-way pipe.

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