Method, device for controlling engine cooling water flow and engine cooling water system

Abstract

The present application relates to a method, device and engine cooling water system for controlling the flow direction of engine cooling water, and belongs to the technical field of gas heat pumps. The method for controlling the flow direction of engine cooling water comprises: detecting the engine cooling water temperature during refrigeration / heating operation; and controlling the real-time opening degree of the first and second execution units according to the refrigeration / heating operation and the detected engine cooling water temperature during refrigeration / heating operation. The present application actively controls the real-time opening degree of the first and second execution units according to the refrigeration / heating operation and the detected engine cooling water temperature during refrigeration / heating operation by sending signals from the control unit, so as to actively control the flow and flow direction of engine cooling water under different operating conditions, to maximize heat utilization and achieve more accurate and reasonable adjustment under the premise of ensuring the reliable and stable operation of the whole system.

Description

Technical Field

[0001] This invention relates to a method, apparatus, and engine cooling water system for controlling the flow direction of engine cooling water, belonging to the field of gas heat pump technology. Background Technology

[0002] Gas heat pumps are a type of air source heat pump. Compared to conventional electric air source heat pumps, gas heat pumps do not require electricity to drive the compressor. Instead, the compressor is driven by a gas engine via a pulley.

[0003] Since natural gas is a primary energy source, using gas to directly drive a heat pump can not only reduce the losses caused by energy conversion, but also improve energy efficiency by allowing the waste heat generated by the combustion of gas in the engine cylinder liner during winter heating to be transported to the end via a cooling water heat exchanger. How to control the flow direction of engine cooling water is one of the important research topics of gas heat pumps.

[0004] Currently, the mainstream method for controlling the flow of engine coolant is to use a thermostat. The thermostat contains a temperature-sensing component that can open / close the valve by means of thermal expansion and contraction, thereby controlling the flow of engine coolant. However, the thermostat is a mechanical three-way valve with a simple structure and no active opening adjustment function. Therefore, the thermostat cannot actively control the flow rate and direction of engine coolant under different operating conditions. In fact, thermostat oscillation may even occur when the engine is cold-started in winter. Frequent opening and closing in a short period of time will also affect the stability of the system and increase fuel consumption.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, device and engine cooling water system for controlling the flow direction of engine cooling water, so as to solve the technical problem that the thermostat does not have the function of actively adjusting the opening, which makes it impossible for the thermostat to actively control the flow rate and direction of engine cooling water under different operating conditions.

[0007] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0008] On one hand, the present invention provides a method for controlling the flow direction of engine cooling water, comprising:

[0009] When operating in cooling / heating mode, monitor the engine coolant temperature.

[0010] The real-time opening degree of the first and second execution units is controlled based on the engine coolant temperature detected during cooling / heating operation and the cooling / heating operation.

[0011] Furthermore, during the cooling operation, the real-time opening degree of the first and second execution units is 100% before the engine starts;

[0012] Tfw is checked every t2 seconds 1 minute after engine start;

[0013] If Tfw > T4, then the real-time opening degree of the first and second execution units is kept at 100%.

[0014] If T4≥Tfw>T3, then control the real-time opening degree of the first execution unit to be c%, and keep the real-time opening degree of the second execution unit at 100%.

[0015] If T3≥Tfw>T2, then control the real-time opening degree of the first execution unit to be b%, and keep the real-time opening degree of the second execution unit at 100%.

[0016] If T2≥Tfw>T1, then control the real-time opening degree of the first execution unit to a%, and keep the real-time opening degree of the second execution unit at 100%.

[0017] If Tfw≤T1, then the real-time opening degree of the first execution unit is controlled to be 0%, and the real-time opening degree of the second execution unit is kept at 100%.

[0018] Where Tfw is the engine coolant temperature; T4 > T3 > T2 > T1, and has a hysteresis value; 100% > c% > b% > a% > 0%.

[0019] Furthermore, during the heating operation, Tfw is detected before the engine starts. If Tfw < Tfl, the real-time opening degree of the first execution unit is controlled to be 0%.

[0020] Tfw is checked every t2 seconds 1 minute after engine start;

[0021] If Tfw > T8, then the real-time opening degree of the first execution unit is controlled to be 100%, and the real-time opening degree of the second execution unit is f%.

[0022] If T8≥Tfw>T7, then the real-time opening degree of the first execution unit is kept at 100%, and the real-time opening degree of the second execution unit is 0%.

[0023] If T7≥Tfw>T6, then control the real-time opening degree of the first execution unit to be e%, and keep the real-time opening degree of the second execution unit at 0%.

[0024] If T6≥Tfw>T5, then control the real-time opening degree of the first execution unit to be d%, and keep the real-time opening degree of the second execution unit at 0%.

[0025] If Tfw≤T5, then the real-time opening degree of the first execution unit is 0%, and the real-time opening degree of the second execution unit is 0%.

[0026] Where Tfl is the preset minimum cooling water temperature; T8 > T7 > T6 > T5, and has a hysteresis value; 100% > e% > d% > 0%; 100% > f% > 0%.

[0027] On the other hand, the present invention provides an apparatus for controlling the flow direction of engine cooling water, the apparatus for controlling the flow direction of engine cooling water being used to perform the above-described method for controlling the flow direction of engine cooling water, comprising:

[0028] The detection unit is used to detect the engine coolant temperature when the engine is in cooling / heating mode.

[0029] The control unit, electrically connected to the detection unit, the first execution unit, and the second execution unit, is used to control the real-time opening degree of the first execution unit and the second execution unit based on the cooling / heating conditions and the engine coolant temperature detected during the operation of the cooling / heating conditions.

[0030] Furthermore, the detection unit employs a coolant temperature sensor, which is installed inside the engine.

[0031] Furthermore, the first execution unit and the second execution unit employ a first electric three-way valve and a second electric three-way valve.

[0032] Furthermore, the control unit sends 0V to 10V control signals to control the real-time opening degree of the first execution unit and the second execution unit, respectively.

[0033] On the other hand, the present invention also provides an engine cooling water system, the engine cooling water system including a memory and a device for controlling the flow direction of engine cooling water, the memory storing instructions for a method of controlling the flow direction of engine cooling water, including:

[0034] The system comprises an engine, a first actuator, a second actuator, a finned radiator, a water pump, a flue gas heat recovery unit, and a cooling water heat recovery unit. Both the first and second actuators have an inlet A, an outlet B, and an outlet C. The inlet A of the first actuator is connected to the cooling water outlet of the engine. The outlet C of the first actuator is connected to the inlet A of the second actuator. The outlet B of the second actuator is connected to the inlet of the cooling water heat recovery unit. The outlet C of the second actuator is connected to the first end of the finned radiator. The second end of the finned radiator, the outlet of the cooling water heat recovery unit, and the outlet B of the first actuator are all connected to the inlet of the water pump. The outlet of the water pump is connected to the first inlet of the flue gas heat recovery unit. The first outlet of the flue gas heat recovery unit is connected to the cooling water inlet of the engine. The flue gas outlet of the engine is connected to the second inlet of the flue gas heat recovery unit. The second outlet of the flue gas heat recovery unit is connected to the atmosphere.

[0035] Furthermore, a fan is provided above the finned heat sink, and the fan rotates clockwise.

[0036] Furthermore, the cooling water heat recovery unit is connected to the user-side water system, and the return water from the user-side water system passes through the cooling water heat recovery unit.

[0037] Compared with the prior art, the beneficial effects achieved by the present invention include:

[0038] This invention uses a control unit to send signals to actively control the real-time opening of the first and second execution units based on the engine coolant temperature detected during cooling / heating operation and the cooling / heating operation. This allows for active control of the engine coolant flow rate and direction under different operating conditions, maximizing heat utilization while ensuring reliable and stable operation of the entire system under various conditions, and making the adjustment more precise and reasonable. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the engine cooling water system provided by the present invention;

[0040] In the diagram: 1: Engine; 2: First electric three-way valve; 3: Second electric three-way valve; 4: Finned radiator; 5: Fan; 6: Water pump; 7: Flue gas heat recovery unit; 8: Cooling water heat recovery unit; 9: Cooling water temperature sensor. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1 As shown, this embodiment provides an engine cooling water system, including an engine 1, a first execution unit 2, a second execution unit 3, a finned radiator 4, a fan 5, a water pump 6, a flue gas heat recovery unit 7, and a cooling water heat recovery unit 8.

[0044] In this embodiment, the first execution unit 2 and the second execution unit 3 adopt a first electric three-way valve and a second electric three-way valve. The first electric three-way valve and the second electric three-way valve can automatically control the opening degree of the valve according to the signal of the adjustment part.

[0045] In this embodiment, both the first execution unit 2 and the second execution unit 3 have an inlet A, an outlet B and an outlet C. The inlet A of the first execution unit 2 is connected to the cooling water outlet of the engine 1, the outlet B of the first execution unit 2 is connected to the inlet of the water pump 6, and the outlet C of the first execution unit 2 is connected to the inlet A of the second execution unit 3.

[0046] Specifically, the outlet B of the first execution unit 2 is used to return the cooling water from the cooling water outlet of the engine 1 directly to the cooling water inlet of the engine 1 when the cooling water temperature of the engine 1 is lower than the minimum cooling water temperature, so as to quickly increase the cooling water temperature of the engine 1.

[0047] In this embodiment, the outlet B of the second execution unit 3 is connected to the inlet of the cooling water heat recovery unit 8. The cooling water heat recovery unit 8 is connected to the user-side water system, which is a circulating water system that provides cooling and heating to the user. The circulating water returning from the user side passes through the cooling water heat recovery unit 8, and the outlet of the cooling water heat recovery unit 8 is connected to the inlet of the water pump 6.

[0048] Specifically, the outlet B of the second execution unit 3 is used to introduce cooling water into the cooling water heat recovery unit 8 during heating operation, thereby transferring the heat in the cooling water to the user-side water system to increase the water temperature and increase the heating capacity.

[0049] In this embodiment, the outlet C of the second execution unit 3 is connected to the first end of the finned radiator 4. A fan 5 is provided above the finned radiator 4. The fan 5 can rotate clockwise. The outlet of the cooling water heat recovery unit 8 is connected to the inlet of the water pump 6. The outlet of the water pump 6 is connected to the first inlet of the flue gas heat recovery unit 7. The first outlet of the flue gas heat recovery unit 7 is connected to the cooling water inlet of the engine 1. The flue gas outlet of the engine 1 is connected to the second inlet of the flue gas heat recovery unit 7. The second outlet of the flue gas heat recovery unit 7 is connected to the atmosphere.

[0050] Specifically, the outlet C of the second execution unit 3 is used to introduce cooling water into the finned radiator 4 during the cooling operation, and transfer the heat in the cooling water to the atmosphere through the finned radiator 4 and the fan 5 when heat recovery is not required.

[0051] Example 2:

[0052] This embodiment provides a method for controlling the flow direction of engine cooling water. The control method is used to control the flow direction of engine cooling water in the engine cooling water system described in Embodiment 1, including:

[0053] When operating in cooling / heating mode, monitor the engine coolant temperature.

[0054] The real-time opening degree of the first and second execution units is controlled based on the engine coolant temperature detected during cooling / heating operation and the cooling / heating operation.

[0055] In this embodiment, when the cooling condition is running, before the engine starts, the real-time opening degree of the first execution unit and the second execution unit is controlled to be 100%, and the engine's cooling water flows completely from the inlet A of the first execution unit to the outlet C of the second execution unit.

[0056] Tfw is checked every t2 seconds 1 minute after engine start;

[0057] If Tfw > T4, then the real-time opening degree of the first and second execution units is kept at 100%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a 100% ratio.

[0058] If T4≥Tfw>T3, then the real-time opening degree of the first execution unit is controlled to be c%, and the real-time opening degree of the second execution unit is kept at 100%. The engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of c%, and flows to the outlet B of the first execution unit at a ratio of 100%-c%.

[0059] If T3≥Tfw>T2, then the real-time opening degree of the first execution unit is b%, and the real-time opening degree of the second execution unit is kept at 100%. The engine's cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of b%, and flows to the outlet B of the first execution unit at a ratio of 100%-b%.

[0060] If T2≥Tfw>T1, then the real-time opening degree of the first execution unit is controlled to be a%, and the real-time opening degree of the second execution unit is kept at 100%. The engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of a%, and flows to the outlet B of the first execution unit at a ratio of 100%-a%.

[0061] If Tfw≤T1, then the real-time opening degree of the first execution unit is 0%, the real-time opening degree of the second execution unit is kept at 100%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the first execution unit at a 100% ratio.

[0062] Where Tfw is the engine coolant temperature; T4 > T3 > T2 > T1, and has a hysteresis value; 100% > c% > b% > a% > 0%.

[0063] In this embodiment, when the heating mode is running, Tfw is detected before the engine starts. If Tfw < Tfl, the real-time opening degree of the first execution unit is controlled to be 0%, and the engine's cooling water flows completely from the inlet A of the first execution unit to the outlet B of the first execution unit.

[0064] Tfw is checked every t2 seconds 1 minute after engine start;

[0065] If Tfw > T8, then the real-time opening degree of the first execution unit is 100%, the real-time opening degree of the second execution unit is f%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of f% and to the outlet B of the second execution unit at a ratio of 100%-f%.

[0066] If T8≥Tfw>T7, then the real-time opening degree of the first execution unit is kept at 100%, the real-time opening degree of the second execution unit is 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a 100% ratio.

[0067] If T7≥Tfw>T6, then the real-time opening degree of the first execution unit is e%, the real-time opening degree of the second execution unit is kept at 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a ratio of e%, and flows to the outlet B of the first execution unit at a ratio of 100%-e%.

[0068] If T6≥Tfw>T5, then the real-time opening degree of the first execution unit is controlled to be d%, and the real-time opening degree of the second execution unit is kept at 0%. The engine cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a ratio of d%, and flows to the outlet B of the first execution unit at a ratio of 100%-d%.

[0069] If Tfw≤T5, then the real-time opening degree of the first execution unit is 0%, the real-time opening degree of the second execution unit is 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the first execution unit at a 100% ratio.

[0070] Where Tfl is the preset minimum cooling water temperature; T8 > T7 > T6 > T5, and has a hysteresis value; 100% > e% > d% > 0%; 100% > f% > 0%.

[0071] In a specific embodiment:

[0072] When operating in cooling mode, before the engine starts, the real-time opening degree of the first and second execution units is controlled to be 100%. After the engine starts, the cooling water flows from the water pump outlet through the flue gas heat recovery unit, the engine, the first execution unit, the second execution unit, and the finned radiator before returning to the water pump. The heat in the engine and the flue gas heat recovery unit is finally transferred to the atmosphere through the fan and the finned radiator.

[0073] Five minutes after the engine starts, the engine coolant temperature (Tfw) is checked every three seconds.

[0074] If Tfw > 96, the real-time opening degree of the first and second execution units is kept at 100%, and the engine's cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a 100% ratio.

[0075] If 96≥Tfw>89, then the real-time opening degree of the first execution unit is controlled to be 75%, the real-time opening degree of the second execution unit is kept at 100%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of 75% and to the outlet B of the first execution unit at a ratio of 25%.

[0076] If 89≥Tfw>78, then the real-time opening degree of the first execution unit is controlled to be 50%, the real-time opening degree of the second execution unit is kept at 100%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of 50% and to the outlet B of the first execution unit at a ratio of 50%.

[0077] If 78≥Tfw>66, then the real-time opening degree of the first execution unit is controlled to be 25%, the real-time opening degree of the second execution unit is kept at 100%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of 25% and to the outlet B of the first execution unit at a ratio of 75%.

[0078] If Tfw≤66, the real-time opening of the first execution unit is controlled to be 0%, and the real-time opening of the second execution unit is kept at 100%. The engine's cooling water flows from the inlet A of the first execution unit to the outlet B of the first execution unit at a 100% ratio, so that all the high-temperature cooling water flows directly back to the engine to increase the engine's cooling water temperature.

[0079] In this embodiment, the hysteresis values ​​of T4, T3, T2 and T1 are all 1. For example, when Tfw = 67, the real-time opening degree of the first execution unit changes from 0% to 25%; when Tfw = 66, the real-time opening degree of the first execution unit changes from 25% to 0%.

[0080] When running in heating mode, Tfw is detected before the engine starts. If the ambient temperature is too low and Tfw < Tfl, the real-time opening of the first execution unit is controlled to 0%. The engine's cooling water flows completely from the inlet A of the first execution unit to the outlet B of the first execution unit, so that all the high-temperature cooling water flows directly back to the engine to increase the engine's cooling water temperature.

[0081] Five minutes after the engine starts, the engine coolant temperature (Tfw) is checked every three seconds.

[0082] If Tfw > 96, then the real-time opening degree of the first execution unit is controlled to be 100%, the real-time opening degree of the second execution unit is 40%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet C of the second execution unit at a ratio of 40% and to the outlet B of the second execution unit at a ratio of 60%.

[0083] If 96 ≥ Tfw > 89, the real-time opening of the first execution unit is maintained at 100%, and the real-time opening of the second execution unit is 0%. The engine's cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a 100% ratio. The cooling water exits the water pump and passes sequentially through the flue gas heat recovery unit, the engine, the first execution unit, the second execution unit, and the cooling water heat recovery unit before returning to the water pump. The heat in the engine and the flue gas heat recovery unit is finally transferred to the user's side water system through the cooling water heat recovery unit.

[0084] If 89≥Tfw>78, then the real-time opening degree of the first execution unit is controlled at 60%, the real-time opening degree of the second execution unit is kept at 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a ratio of 60% and to the outlet B of the first execution unit at a ratio of 40%.

[0085] If 78≥Tfw>66, then the real-time opening degree of the first execution unit is controlled to be 30%, the real-time opening degree of the second execution unit is kept at 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the second execution unit at a ratio of 30% and to the outlet B of the first execution unit at a ratio of 70%.

[0086] If Tfw≤66, the real-time opening degree of the first execution unit is controlled to be 0%, the real-time opening degree of the second execution unit is controlled to be 0%, and the engine cooling water flows from the inlet A of the first execution unit to the outlet B of the first execution unit at a 100% ratio, so that all the high-temperature cooling water flows directly back to the engine to increase the engine cooling water temperature.

[0087] In this embodiment, the hysteresis values ​​of T8, T7, T6 and T5 are all 1. For example, when Tfw = 67, the real-time opening degree of the first execution unit changes from 0% to 30%; when Tfw = 66, the real-time opening degree of the first execution unit changes from 30% to 0%.

[0088] Example 3:

[0089] This embodiment provides a device for controlling the flow direction of engine cooling water. The device is used to execute the method for controlling the flow direction of engine cooling water described in Embodiment 2, characterized in that it includes:

[0090] Detection unit 9 is used to detect the engine coolant temperature when the engine is in cooling / heating mode.

[0091] The control unit is electrically connected to the detection unit 9, the first execution unit 2, and the second execution unit 3, and is used to control the real-time opening degree of the first execution unit 2 and the second execution unit 3 according to the cooling / heating conditions and the engine coolant temperature detected during the operation of the cooling / heating conditions.

[0092] In this embodiment, the detection unit 9 is a coolant temperature sensor, which is installed inside the engine 1.

[0093] In this embodiment, the control unit sends a 0V to 10V control signal to control the real-time opening degree of the first execution unit 2 and the second execution unit 3 respectively.

[0094] Specifically, the first execution unit 2 and the second execution unit 3 have a proportional adjustment function, which can automatically control the opening degree of the valve according to the signal sent by the control unit.

[0095] In this embodiment, the control unit is a control motherboard, which is installed in an external electrical control box and electrically connected to the first execution unit 2 and the second execution unit 3.

[0096] Specifically, when the control motherboard sends a 0V control signal to the first execution unit 2, the real-time opening degree of the first execution unit 2 is 0%, and the cooling water of the engine 1 flows completely from the inlet A of the first execution unit 2 to the outlet B of the first execution unit 2.

[0097] When the control motherboard sends a control signal between 0V and 10V to the first execution unit 2, the first execution unit 2 adjusts the real-time opening between 0% and 100%, and the cooling water of the engine 1 flows from the inlet A of the first execution unit 2 to the outlets B and C of the first execution unit 2 in proportion.

[0098] When the control motherboard sends a 10V control signal to the first execution unit 2, the real-time opening degree of the first execution unit 2 is 100%, and the cooling water of the engine 1 flows completely from the inlet A of the first execution unit 2 to the outlet C of the first execution unit 2.

[0099] Similarly, when the control motherboard sends a 0V control signal to the second execution unit 3, the real-time opening degree of the second execution unit 3 is 0%, and the cooling water of the engine 1 flows completely from the inlet A of the second execution unit 3 to the outlet B of the second execution unit 3.

[0100] When the control motherboard sends a control signal between 0V and 10V to the second execution unit 3, the second execution unit 3 adjusts the corresponding real-time opening between 0% and 100%, and the cooling water of the engine 1 flows proportionally from the inlet A of the second execution unit 3 to the outlets B and C of the second execution unit 3.

[0101] When the control motherboard sends a 10V control signal to the second execution unit 3, the real-time opening degree of the second execution unit 3 is 100%, and the cooling water of the engine 1 flows completely from the inlet A of the second execution unit 3 to the outlet C of the second execution unit 3.

[0102] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0103] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlling the flow direction of engine cooling water, characterized in that, Based on the engine cooling water system, the engine cooling water system includes: The system comprises an engine (1), a first actuator (2), a second actuator (3), a finned radiator (4), a water pump (6), a flue gas heat recovery unit (7), and a cooling water heat recovery unit (8). Both the first actuator (2) and the second actuator (3) have an inlet A, an outlet B, and an outlet C. The inlet A of the first actuator (2) is connected to the cooling water outlet of the engine (1), the outlet C of the first actuator (2) is connected to the inlet A of the second actuator (3), the outlet B of the second actuator (3) is connected to the inlet of the cooling water heat recovery unit (8), and the outlet C of the second actuator (3) is connected to the outlet of the finned radiator (4). At the first end, the second end of the finned radiator (4), the outlet of the cooling water heat recovery unit (8), and the outlet B of the first execution unit (2) are all connected to the inlet of the water pump (6). The outlet of the water pump (6) is connected to the first inlet of the flue gas heat recovery unit (7). The first outlet of the flue gas heat recovery unit (7) is connected to the cooling water inlet of the engine (1). The flue gas outlet of the engine (1) is connected to the second inlet of the flue gas heat recovery unit (7). The second outlet of the flue gas heat recovery unit (7) is connected to the atmosphere. The cooling water heat recovery unit (8) is connected to the user-side water system, and the return water of the user-side water system passes through the cooling water heat recovery unit (8). The method includes: detecting the engine coolant temperature during operation in cooling / heating mode; The real-time opening degree of the first and second execution units is controlled based on the engine coolant temperature detected during the cooling / heating operation and the cooling / heating operation. When the engine is running in the cooling mode, the real-time opening degree of the first and second execution units is 100% before the engine starts. Tfw is checked every t2 seconds 1 minute after engine start; If Tfw > T4, then the real-time opening degree of the first and second execution units is kept at 100%. If T4≥Tfw>T3, then control the real-time opening degree of the first execution unit to be c%, and keep the real-time opening degree of the second execution unit at 100%. If T3≥Tfw>T2, then control the real-time opening degree of the first execution unit to be b%, and keep the real-time opening degree of the second execution unit at 100%. If T2≥Tfw>T1, then control the real-time opening degree of the first execution unit to a%, and keep the real-time opening degree of the second execution unit at 100%. If Tfw≤T1, then the real-time opening degree of the first execution unit is controlled to be 0%, and the real-time opening degree of the second execution unit is kept at 100%. Where Tfw is the engine coolant temperature; T4 > T3 > T2 > T1, and has a hysteresis value; 100% > c% > b% > a% > 0%; When the heating mode is running, Tfw is detected before the engine starts. If Tfw < Tfl, the real-time opening degree of the first execution unit is controlled to be 0%. Tfw is checked every t2 seconds 1 minute after engine start; If Tfw > T8, then the real-time opening degree of the first execution unit is controlled to be 100%, and the real-time opening degree of the second execution unit is f%. If T8≥Tfw>T7, then the real-time opening degree of the first execution unit is kept at 100%, and the real-time opening degree of the second execution unit is 0%. If T7≥Tfw>T6, then control the real-time opening degree of the first execution unit to be e%, and keep the real-time opening degree of the second execution unit at 0%. If T6≥Tfw>T5, then control the real-time opening degree of the first execution unit to be d%, and keep the real-time opening degree of the second execution unit at 0%. If Tfw≤T5, then the real-time opening degree of the first execution unit is 0%, and the real-time opening degree of the second execution unit is 0%. Where Tfl is the preset minimum cooling water temperature; T8 > T7 > T6 > T5, and has a hysteresis value; 100% > e% > d% > 0%; 100% > f% > 0%.

2. The method for controlling the flow direction of engine cooling water according to claim 1, characterized in that, A fan (5) is provided above the finned radiator (4), and the fan (5) rotates clockwise.

3. A device for controlling the flow direction of engine cooling water, said device for performing the method for controlling the flow direction of engine cooling water as described in claim 1 or 2, characterized in that, include: The detection unit (9) is used to detect the engine coolant temperature when the engine is running in cooling / heating mode. The control unit is electrically connected to the detection unit (9), the first execution unit (2), and the second execution unit (3) and is used to control the real-time opening degree of the first execution unit (2) and the second execution unit (3) according to the cooling / heating conditions and the engine coolant temperature detected during the operation of the cooling / heating conditions.

4. The device for controlling the flow direction of engine cooling water according to claim 3, characterized in that, The detection unit (9) uses a cooling water temperature sensor, which is installed inside the engine.

5. The device for controlling the flow direction of engine cooling water according to claim 3, characterized in that, The first execution unit (2) and the second execution unit (3) adopt a first electric three-way valve and a second electric three-way valve.

6. The device for controlling the flow direction of engine cooling water according to claim 3, characterized in that, The control unit sends 0V to 10V control signals to control the real-time opening degree of the first execution unit (2) and the second execution unit (3) respectively.

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