Energy-saving thermal management method and system for engine

Abstract

The invention relates to the field of engines, and discloses an engine energy-saving thermal management method and system.The system comprises an electric control unit and a cooling device, and the cooling device comprises a cylinder sleeve water heater, a first temperature adjusting valve, a fresh water pump and a sea water pump; the method comprises the steps that the temperature of internal circulating water is obtained, after an engine operates normally, the cylinder sleeve water heater is controlled to stop, the temperature of the internal circulating water is compared with the preset temperature of the internal circulating water, and according to the comparison result, the opening degree of the first temperature adjusting valve is controlled, the fresh water pump is controlled to operate at different rotating speeds, and the sea water pump is controlled to operate at different rotating speeds or an alarm is triggered. Therefore, the temperature of the internal circulating water is detected in real time in the operation process of the engine, and the fresh water pump and the sea water pump are matched with corresponding different rotating speeds according to the temperature of the internal circulating water, so that the energy consumption in the operation process is effectively reduced, and the internal circulating water is within the use temperature range; and the influence on the service life of the engine caused by over-high or over-low temperature of the internal circulating water of the engine is also reduced.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine energy-saving thermal management method and system. Background Technology

[0002] In cold conditions, increased oil viscosity, low internal coolant temperature, and insufficient intake air temperature can all lead to difficulty in engine ignition or unstable operation, or even failure to start cold, severely impacting the user experience. In addition, repeated cold start failures can also damage engine reliability. During operation, the existing engine thermal management system uses the same cooling power for water at different temperatures, resulting in significant energy waste and increasing user operating costs.

[0003] Existing water boilers typically use manual control to heat the internal circulating water. Although the heated internal circulating water can heat the engine oil to a certain extent, it cannot automatically stop after reaching the specified temperature, and it is difficult to achieve independent and efficient circulation preheating of the engine oil.

[0004] Current intake systems typically use a fixed-power heating grille to heat the cold air entering the cylinder; this one-size-fits-all heating method results in unnecessary energy waste.

[0005] In existing cooling systems, freshwater pumps and seawater pumps typically operate at a constant speed, making it impossible to adjust the flow rate in real time according to changes in the internal circulating water temperature and seawater temperature. This results in a large amount of ineffective energy waste under low load or low temperature conditions. Summary of the Invention

[0006] To address the aforementioned shortcomings, the technical problem to be solved by this invention is to provide an engine energy-saving thermal management method and system, which can effectively reduce energy consumption during engine operation by real-time detection of the internal circulating water temperature and matching the freshwater pump and seawater pump with corresponding different speeds based on the internal circulating water temperature.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] An engine energy-saving thermal management method is applied to an engine energy-saving thermal management system, the engine energy-saving thermal management system including a cooling device, the cooling device including a cylinder liner water heater, a first temperature regulating valve, a fresh water pump and a seawater pump; the thermal management method includes the following steps:

[0009] S10, Obtain the internal circulating water temperature;

[0010] S20. After the engine is running normally, control the cylinder liner water heater to stop heating, determine whether the internal circulating water temperature is less than T1, determine whether the internal circulating water temperature is within the range of [T1, T2), determine whether the internal circulating water temperature is within the range of [T2, T3), and determine whether the internal circulating water temperature is greater than or equal to T3, where T1 < T2 < T3.

[0011] S30. If the internal circulating water temperature is less than T1, generate the corresponding first water temperature control signal.

[0012] If the internal circulating water temperature is within the range of [T1, T2), a corresponding second water temperature control signal is generated;

[0013] If the internal circulating water temperature is within the range of [T2, T3), a corresponding third water temperature control signal is generated;

[0014] If the internal circulating water temperature is greater than or equal to T3, a corresponding internal circulating water alarm signal will be generated.

[0015] S40. Based on the first water temperature control signal, control the first temperature regulating valve to open the small circulation, control the freshwater pump to run at a slow speed V1, and control the seawater pump to stop running.

[0016] Based on the second water temperature control signal, control the first temperature regulating valve to be in a half-open state, control the freshwater pump to run at medium speed V2, and control the seawater pump to run at slow speed V4.

[0017] Based on the third water temperature control signal, control the first temperature regulating valve to be fully open, control the freshwater pump to run at high speed V3, and control the seawater pump to run at medium speed V5.

[0018] Based on the internal circulation water alarm signal, control the freshwater pump to run at high speed V3 and control the seawater pump to run at high speed V6, triggering the internal circulation water temperature alarm.

[0019] In a preferred embodiment, the thermal management method further includes the following steps:

[0020] S50, obtain seawater temperature;

[0021] S60. Determine whether the seawater temperature is less than T4, determine whether the seawater temperature is within the range [T4, T5), and determine whether the seawater temperature is greater than or equal to T5.

[0022] S70. If the seawater temperature is less than T4, generate the corresponding first revision signal;

[0023] If the seawater temperature is within the range of [T4, T5), a corresponding sustaining signal is generated;

[0024] If the seawater temperature is greater than or equal to T5, a corresponding second revision signal is generated;

[0025] S80. Based on the first revision signal, control the seawater pump speed to decrease by n1;

[0026] Based on the maintenance signal, control the seawater pump to maintain its speed;

[0027] Based on the second revised signal, the speed of the seawater pump is increased by n2.

[0028] A preferred embodiment includes the following step after step S10:

[0029] When the engine is in standby mode, check if the internal circulating water temperature is lower than T1;

[0030] If the internal circulating water temperature is less than T1, the cylinder liner water heater will be started to heat until the internal circulating water temperature reaches T1 and then heating will stop.

[0031] In a preferred embodiment, the engine energy-saving thermal management system further includes a lubrication device, which includes an oil heater, a second temperature regulating valve, and an electric pre-supply oil pump.

[0032] S10 further includes: acquiring the engine oil temperature;

[0033] S20 further includes: when the engine is running normally, controlling the oil heater to stop heating;

[0034] Between S10 and S20, the following step is also included:

[0035] S12. When the engine is in standby mode, control the electric pre-supply oil pump to start, determine whether the oil temperature is less than t1, determine whether the oil temperature is within the range of [t1, t2), determine whether the oil temperature is within the range of [t2, t3), and determine whether the oil temperature is greater than or equal to t3.

[0036] S14. If the oil temperature is less than t1, generate the corresponding first oil temperature control signal;

[0037] If the oil temperature is within the range of [t1, t2), a corresponding second oil temperature control signal is generated;

[0038] If the oil temperature is within the range of [t2, t3), a corresponding third oil temperature control signal is generated;

[0039] If the oil temperature is greater than or equal to t3, a corresponding oil alarm signal will be generated.

[0040] S16. Based on the first oil temperature control signal, control the second temperature regulating valve to allow the oil to flow to the oil heater to preheat the oil;

[0041] Based on the second oil temperature control signal, the second temperature regulating valve is controlled to be in a half-open state, and the oil is divided into two paths. One path of oil is heated by the oil heater and then flows back to the internal oil passage of the engine, while the other path of oil flows directly back to the internal oil passage of the engine.

[0042] Based on the third oil temperature control signal, the second temperature regulating valve is controlled to be fully open, so that the oil flows directly back to the internal oil passage of the engine and the oil heater is controlled to stop heating.

[0043] Based on the oil alarm signal, the oil heater is controlled to stop heating, triggering the oil alarm.

[0044] In a preferred embodiment, the engine energy-saving thermal management system further includes an intake device, which includes an air filter and an intake heater.

[0045] S10 further includes: acquiring the intake air temperature;

[0046] The S20 further includes: the engine is running normally, determining whether the intake air temperature is less than H1, determining whether the intake air temperature is within the range of [H1, H2), determining whether the intake air temperature is within the range of [H2, H3), and determining whether the intake air temperature is greater than or equal to H3.

[0047] The S30 further includes:

[0048] If the intake air temperature is less than H1, a corresponding first temperature control signal is generated;

[0049] If the intake air temperature is within the range of [H1, H2), a corresponding second air temperature control signal is generated;

[0050] If the intake air temperature is within the range of [H2, H3), a corresponding third temperature control signal is generated;

[0051] If the intake air temperature is greater than or equal to H3, a corresponding stop signal is generated;

[0052] The S40 further includes:

[0053] Based on the first temperature control signal, control the intake heater to heat according to the preset intake power P1;

[0054] Based on the second temperature control signal, control the intake heater to heat according to the preset intake power P2;

[0055] According to the third temperature control signal, the intake heater is controlled to heat according to the preset intake power P3, where P1>P2>P3;

[0056] Based on the stop signal, control the intake air heater to stop heating.

[0057] In a preferred embodiment, the thermal management method further includes the following steps:

[0058] When the engine starts, if the intake air temperature is less than H1, the intake air heater is activated; if the intake air temperature is greater than or equal to H3, the intake air heater is deactivated.

[0059] In a preferred embodiment, the engine energy-saving thermal management system further includes a human-machine interaction unit;

[0060] The thermal management method further includes the following steps:

[0061] Acquire human-computer interaction signals;

[0062] Determine whether the human-computer interaction signal is a low ambient temperature signal, a medium ambient temperature signal, or a high ambient temperature signal;

[0063] Based on the comparison results, the cooling device, the lubrication device, and / or the air intake device are controlled according to a preset mode.

[0064] An engine energy-saving thermal management system includes an electronic control unit (ECU) and a cooling device connected in communication. The cooling device includes a cylinder liner water heater, a first temperature regulating valve, a freshwater pump, a heat exchanger, a seawater pump, an internal circulating water temperature detection unit, and a seawater temperature detection unit, all connected to the engine. The internal circulating water temperature detection unit detects the internal circulating water temperature and transmits it to the ECU. The seawater temperature detection unit detects the seawater temperature and transmits it to the ECU. After the engine is running normally, the ECU compares the internal circulating water temperature with a preset internal circulating water temperature. Based on the comparison result, it controls the first temperature regulating valve, the freshwater pump to operate at different speeds, and the seawater pump to operate at different speeds. The ECU also compares the seawater temperature with a preset seawater temperature. Based on the comparison result, it controls the seawater pump to reduce, maintain, or increase its normal operating speed.

[0065] A preferred embodiment further includes a lubrication device communicatively connected to the electronic control unit. The lubrication device includes an oil heater, a second temperature regulating valve, an electric pre-supply oil pump, and an oil temperature detection unit. The oil temperature detection unit detects the oil temperature and transmits it to the electronic control unit. After the engine is running normally, the electronic control unit controls the oil heater to stop heating. When the engine is in standby mode, the electronic control unit compares the oil temperature with a preset oil temperature. Based on the comparison result, it controls the oil heater to heat according to the preset oil power or controls the oil heater to stop heating and triggers an oil alarm.

[0066] A preferred embodiment further includes an intake device communicatively connected to the electronic control unit (ECU). The intake device includes an air filter, an intake heater, and an intake temperature detection unit. The intake temperature detection unit detects the intake temperature and transmits the data to the ECU. When the engine starts, the ECU controls the intake heater to start heating when the intake temperature is lower than a preset intake temperature H1, and controls the intake heater to stop heating when the intake temperature is greater than or equal to the preset intake temperature H3. When the engine is running normally, the ECU compares the intake temperature with the preset intake temperature and, based on the comparison result, controls the intake heater to heat at a preset intake power or controls the intake heater to stop heating.

[0067] After adopting the above technical solution, the beneficial effects of the present invention are:

[0068] The engine energy-saving thermal management method and system of the present invention, wherein the thermal management system includes an electronic control unit and a cooling device connected in communication, the cooling device including a cylinder liner water heater, a first temperature regulating valve, a freshwater pump and a seawater pump connected to the engine; wherein the thermal management method first acquires the internal circulating water temperature; after the engine is running normally, the cylinder liner water heater is controlled to stop heating, and then the internal circulating water temperature is compared with a preset internal circulating water temperature, and then, based on the comparison result, the opening degree of the first temperature regulating valve is controlled, the freshwater pump is controlled to operate at different speeds, the seawater pump is controlled to operate at different speeds or an internal circulating water temperature alarm is triggered. It can be seen that the present invention effectively reduces energy consumption during engine operation by real-time detection of the internal circulating water temperature and matching the freshwater pump and seawater pump to corresponding different speeds based on the internal circulating water temperature, thereby reducing user operating costs, keeping the internal circulating water within the operating temperature range, and also reducing the impact on engine life caused by excessively high or low internal circulating water temperatures. Attached Figure Description

[0069] Figure 1 This is a flowchart of the engine energy-saving thermal management method in this invention;

[0070] Figure 2 This is a logic block diagram of the engine energy-saving thermal management system in this invention;

[0071] Figure 3 This is a flowchart of the engine oil temperature control in the engine standby state according to the present invention;

[0072] Figure 4 This is a flowchart illustrating the automatic temperature rise of low-temperature internal circulating water to a specified temperature in this invention.

[0073] Figure 5 This is a flowchart illustrating the internal circulating water temperature control during normal engine operation in this invention.

[0074] Figure 6This is a flowchart of the seawater pump speed revision process in this invention;

[0075] Figure 7 This is a flowchart of the intake air temperature control in the engine standby state according to the present invention;

[0076] Figure 8 This is a flowchart illustrating the intake air temperature control during normal engine operation in this invention.

[0077] In the diagram: 10-First temperature control valve, 11-Second temperature control valve, 20-Fresh water pump, 21-Seawater pump, 22-Electric pre-fuel pump, 30-Heat exchanger, 31-Cylinder liner water heater, 32-Oil heater, 33-Intake air heater, 40-Internal circulation water temperature sensor, 41-Seawater temperature sensor, 42-Oil temperature sensor, 43-Intake air temperature sensor. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0079] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0080] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0081] Example 1:

[0082] like Figure 1 As shown, an engine energy-saving thermal management method is applied to the engine energy-saving thermal management system described in Embodiment 2. The engine energy-saving thermal management system includes an electronic control unit and a cooling device connected in communication. The cooling device includes a cylinder liner water heater 31 connected to the engine, a first temperature regulating valve 10, a freshwater pump 20, a seawater pump 21, and a heat exchanger 30. The first temperature regulating valve 10 is an electrically operated three-way valve that electrically controls the flow path of the internal circulating water. See [link to documentation]. Figure 2 ;

[0083] The engine energy-saving thermal management method of the present invention includes the following steps:

[0084] Step S10: Obtain the internal circulating water temperature; the internal circulating water temperature is the real-time temperature of the fresh water inside the engine detected by the internal circulating water temperature sensor.

[0085] Step S20: After the engine is running normally, control the cylinder liner water heater to stop heating;

[0086] Determine if the internal circulating water temperature is lower than T1.

[0087] Determine whether the internal circulating water temperature is within the range [T1, T2).

[0088] Determine whether the internal circulating water temperature is within the range [T2, T3).

[0089] Determine whether the internal circulating water temperature is greater than or equal to T3, where T1 < T2 < T3;

[0090] Step S30: If the internal circulating water temperature is less than T1, i.e., the internal circulating water temperature < T1, generate the corresponding first water temperature control signal.

[0091] If the internal circulating water temperature is within the range [T1, T2), that is, T1≤internal circulating water temperature<T2, a corresponding second water temperature control signal is generated;

[0092] If the internal circulating water temperature is within the range of [T2, T3), that is, T2≤internal circulating water temperature<T3, the corresponding third water temperature control signal is generated;

[0093] If the internal circulating water temperature is greater than or equal to T3, i.e., T3 ≤ internal circulating water temperature, a corresponding internal circulating water alarm signal is generated.

[0094] It should be noted that: T1 is the initial opening temperature of the first temperature regulating valve, T2 is the fully opening temperature of the first temperature regulating valve, and T3 is the high temperature alarm value of the internal circulating water.

[0095] Step S40: Based on the first water temperature control signal, control the first temperature regulating valve to open the small circulation, control the freshwater pump to run at a slow speed V1 (to reduce energy consumption), and control the seawater pump to stop running.

[0096] According to the second water temperature control signal, the first temperature regulating valve is controlled to be in a half-open state. Specifically, one path flows back to the engine internal pipeline through the fresh water pump, and the other path flows back to the engine internal pipeline after heat exchange through the heat exchanger. The fresh water pump is controlled to run at medium speed V2, and the seawater pump is controlled to run at slow speed V4 to reduce the energy consumption of the seawater pump.

[0097] Based on the third water temperature control signal, control the first temperature regulating valve to be fully open, control the freshwater pump to run at high speed V3, and control the seawater pump to run at medium speed V5.

[0098] Based on the internal circulation water alarm signal, the freshwater pump is controlled to run at high speed V3, and the seawater pump is controlled to run at high speed V6, triggering the internal circulation water temperature alarm, where V1 < V2 < V3; v4 < v5 < v6, and all are preset values.

[0099] The engine energy-saving thermal management method of the present invention, when a marine engine is operating in an extremely cold environment, detects the real-time internal circulating water temperature during engine operation and matches the electromagnetic freshwater pump and electromagnetic seawater pump with corresponding different speeds according to the internal circulating water temperature, effectively reducing energy waste during operation, thereby reducing the user's operating costs, and keeping the internal circulating water within the operating temperature range, reducing the impact on engine life caused by excessively high or low internal circulating water temperature.

[0100] like Figure 1 As shown, the engine energy-saving thermal management method in this embodiment further includes the following steps:

[0101] Step S50: Obtain seawater temperature; detect seawater temperature in real time using a seawater temperature sensor.

[0102] Step S60: Determine if the seawater temperature is less than T4.

[0103] Determine whether the seawater temperature is within the range [T4, T5).

[0104] Determine if the seawater temperature is greater than or equal to T5;

[0105] Step S70: If the seawater temperature is less than T4, i.e., the seawater temperature < T4, generate the corresponding first revision signal. T4 can be, but is not limited to, 5°C.

[0106] If the seawater temperature is within the range [T4, T5), i.e., T4 ≤ seawater temperature < T5, a corresponding sustaining signal is generated. T5 can be, but is not limited to, 15℃.

[0107] If the seawater temperature is greater than or equal to T5, i.e., T5 ≤ seawater temperature, a corresponding second revision signal is generated;

[0108] Step S80: According to the first revision signal, control the seawater pump speed to decrease by n1 rpm / min, where n1 can be, but is not limited to, 100;

[0109] Based on the maintenance signal, the seawater pump is controlled to maintain its speed, that is, to continue operating in the current state.

[0110] According to the second revised signal, the speed of the seawater pump is increased by n2 rpm / min, where n2 can be, but is not limited to, 100.

[0111] This invention modifies the operating status of an electromagnetic seawater pump by collecting real-time seawater temperature data. Through performance calibration, the operating speed of the electromagnetic seawater pump is adjusted within different seawater temperature ranges. For example, when the seawater temperature is <5℃, the electromagnetic seawater pump operates at 100 rpm / min below its normal speed; when 5℃ ≤ seawater temperature <15℃, the electromagnetic seawater pump operates at its normal speed; and when 15℃ ≤ seawater temperature, the electromagnetic seawater pump operates at 100 rpm / min above its normal speed.

[0112] As can be seen, this invention adjusts the speed of the electromagnetic seawater pump by detecting the real-time seawater temperature during engine operation, effectively reducing the energy waste of the seawater pump during operation, keeping the internal circulating water within the operating temperature range, and further reducing the impact on engine life caused by excessively high or low internal circulating water temperature.

[0113] like Figure 4 As shown, in some embodiments of the present invention, the following step is further included between step S10 and step S20:

[0114] When the engine is in standby mode (e.g., in extremely cold environments where the ambient temperature is ≤-10℃), determine whether the internal circulating water temperature is lower than T1;

[0115] If the internal circulating water temperature is less than T1, i.e., the internal circulating water temperature < T1, the cylinder liner water heater is started until the internal circulating water temperature reaches T1, i.e., the internal circulating water temperature = T1, at which point the cylinder liner water heater stops heating.

[0116] When marine engines operate in extremely cold environments, this invention effectively improves the engine's starting performance by heating the internal circulating water before starting via a cylinder liner water heater.

[0117] like Figure 2 and Figure 3 As shown, the engine energy-saving thermal management system of the present invention also includes a lubrication device that is communicatively connected to the electronic control unit. The lubrication device includes an oil heater 32, a second temperature regulating valve 11, and an electric pre-supply oil pump 22, wherein the second temperature regulating valve 11 is an electric three-way valve that electrically controls the oil flow path.

[0118] Step S10 further includes: acquiring the engine oil temperature; the engine oil temperature is the real-time temperature of the lubricating oil inside the engine detected by the engine oil temperature sensor.

[0119] Step S20 also includes: the engine is running normally, and the oil heater is controlled to stop heating;

[0120] Between step S10 and step S20, the following steps are also included:

[0121] Step S12: When the engine is in standby mode, control the electric pre-fuel pump to start.

[0122] Determine if the engine oil temperature is less than t1.

[0123] Determine if the engine oil temperature is within the range [t1, t2).

[0124] Determine if the engine oil temperature is within the range [t2, t3).

[0125] Determine if the engine oil temperature is greater than or equal to t3;

[0126] Step S14: If the oil temperature is less than t1, i.e., the oil temperature < t1, generate the corresponding first oil temperature control signal.

[0127] If the oil temperature is within the range [t1, t2), i.e. t1≤oil temperature<t2, a corresponding second oil temperature control signal is generated;

[0128] If the oil temperature is within the range [t2, t3), i.e. t2≤oil temperature<t3, a corresponding third oil temperature control signal is generated;

[0129] If the oil temperature is greater than or equal to t3, i.e. t3 ≤ oil temperature, a corresponding oil alarm signal is generated.

[0130] Step S16: Based on the first oil temperature control signal, control the second temperature regulating valve to allow the oil to flow to the oil heater to preheat the oil;

[0131] Based on the second oil temperature control signal, the second temperature regulating valve is controlled to be in a half-open state, and the oil is controlled to flow back to the engine internal oil passage after being heated by the oil heater, and the other oil flows back to the engine internal oil passage.

[0132] Based on the third oil temperature control signal, the second temperature regulating valve is controlled to be fully open, so that the oil flows directly back to the internal oil passage of the engine and the oil heater is controlled to stop heating.

[0133] Based on the oil alarm signal, the oil alarm is triggered, and the oil heater is stopped from heating.

[0134] It should be noted that: t1 is the initial opening temperature of the second temperature regulating valve, t2 is the fully open temperature of the second temperature regulating valve, and t3 is the high oil temperature alarm temperature.

[0135] When the marine engine operates in an extremely cold environment, the present invention heats the engine oil through an engine oil heater before starting, effectively improving the starting performance of the engine; and can control the opening degree of the second temperature regulating valve according to the real-time temperature of the engine oil, while ensuring that the engine oil is within the preset temperature range, further reducing the energy consumption.

[0136] As Figure 2 and Figure 8 shown, in some embodiments of the present invention, the engine energy-saving thermal management system further includes an intake device communicatively connected to the electronic control unit. The intake device includes an air filter and an intake heater 33;

[0137] Step S10 further includes: obtaining the intake air temperature; the intake air temperature is the real-time temperature of the air at the engine intake pipe (for in-cylinder combustion) detected by the intake air temperature sensor.

[0138] Step S20 further includes: when the engine is running normally, judging whether the intake air temperature is less than H1,

[0139] judging whether the intake air temperature is within the range of [H1, H2),

[0140] judging whether the intake air temperature is within the range of [H2, H3),

[0141] judging whether the intake air temperature is greater than or equal to H3;

[0142] Step S30 further includes:

[0143] If the intake air temperature is less than H1, that is, the intake air temperature < H1, generating a corresponding first air temperature control signal;

[0144] If the intake air temperature is within the range of [H1, H2), that is, H1 ≤ intake air temperature < H2, generating a corresponding second air temperature control signal;

[0145] If the intake air temperature is within the range of [H2, H3), that is, H2 ≤ intake air temperature < H3, generating a corresponding third air temperature control signal;

[0146] If the intake air temperature is greater than or equal to H3, that is, H3 ≤ intake air temperature, generating a corresponding stop signal;

[0147] Step S40 further includes:

[0148] According to the first air temperature control signal, controlling the intake heater to heat at a preset intake power P1;

[0149] According to the second air temperature control signal, controlling the intake heater to heat at a preset intake power P2;

[0150] According to the third air temperature control signal, controlling the intake heater to heat at a preset intake power P3, where P1 > P2 > P3;

[0151] It should be noted that the preset intake power is the operating power of the heating device (intake heater) at the intake manifold for heating the intake air (used for in-cylinder combustion).

[0152] Based on the stop signal, control the intake air heater to stop heating.

[0153] During engine operation, the ambient temperature can be determined by detecting the intake air temperature. Based on the temperature range of the intake air, the intake air heater is controlled to select the appropriate power to heat the air, thereby reducing energy consumption.

[0154] like Figure 2 and Figure 7 As shown, in some other embodiments of the present invention, the engine energy-saving thermal management method further includes the following steps:

[0155] When the engine starts, if the intake air temperature is less than H1 (H1 is the minimum starting limit temperature for cold start, i.e., intake air temperature < H1), the intake air heater is activated. If the intake air temperature is greater than or equal to H3 (i.e., H3 ≤ intake air temperature), the intake air heater is deactivated and heating is carried out directly by water or oil.

[0156] When marine engines operate in extremely cold environments, this invention further improves the engine's starting performance by heating it with different powers according to the intake air temperature before starting.

[0157] like Figure 2 As shown, in some other embodiments of the present invention, the engine energy-saving thermal management system further includes a human-machine interface unit communicatively connected to the electronic control unit; therefore, the engine energy-saving thermal management method of the present invention further includes the following steps:

[0158] Acquire human-computer interaction signals;

[0159] Determine whether the human-computer interaction signal is a low ambient temperature signal, a medium ambient temperature signal, or a high ambient temperature signal;

[0160] Based on the comparison results, the cooling device, lubrication device, and / or intake device are controlled according to the preset mode, wherein the preset mode may be the thermal management method for internal circulating water temperature, intake air temperature, and engine oil temperature described above.

[0161] The human-machine interface unit communicates with the ECU and can be set with low temperature, medium temperature and high temperature control settings. If the automatic mode fails, it can be switched to manual mode to achieve control redundancy.

[0162] In summary, the engine energy-saving thermal management method of the present invention can automatically or manually heat the engine oil, internal circulating water, and intake air to a specified temperature in low-temperature environments, and match different cooling powers for internal circulating water and seawater at different temperature ranges, which is conducive to normal engine operation, energy saving and consumption reduction, and improved economic efficiency.

[0163] Example 2:

[0164] like Figure 2 As shown, an engine energy-saving thermal management system includes an electronic control unit and a cooling device connected in communication. The cooling device includes a cylinder liner water heater 31, a first temperature regulating valve 10, a fresh water pump 20, a heat exchanger 30, a seawater pump 21, an internal circulating water temperature detection unit, and a seawater temperature detection unit that are connected to the engine. In this embodiment, the internal circulating water temperature detection unit includes an internal circulating water temperature sensor 40, and the seawater temperature detection unit includes a seawater temperature sensor 41.

[0165] After the engine is running normally, the electronic control unit compares the internal circulating water temperature with the preset internal circulating water temperature. Based on the comparison result, it controls the opening of the first temperature regulating valve 10, controls the fresh water pump 20 to run at different speeds, and controls the seawater pump 21 to run at different speeds. The electronic control unit compares the seawater temperature with the preset seawater temperature. Based on the comparison result, it controls the seawater pump 21 to reduce its normal speed, maintain its normal speed, or increase its normal speed.

[0166] Specifically, when the internal circulating water temperature is <T1, the electronic control unit controls the first temperature regulating valve 10 to open the small circulation, controls the freshwater pump 20 to run at a slow speed V1, and controls the seawater pump 21 to stop running; when T1 ≤ internal circulating water temperature <T2, the electronic control unit controls the first temperature regulating valve 10 to be in a half-open state, controls the freshwater pump 20 to run at a medium speed V2, and controls the seawater pump 21 to run at a slow speed v4; when T2 ≤ internal circulating water temperature <T3, the electronic control unit controls the first temperature regulating valve 10 to be in a fully open state, controls the freshwater pump 20 to run at a high speed V3, and controls the seawater pump 21 to run at a medium speed v5; when T3 ≤ internal circulating water temperature, the electronic control unit controls the freshwater pump 20 to run at a high speed V3, and controls the seawater pump 21 to run at a high speed v6, triggering an internal circulating water temperature alarm, where V1 < V2 < V3, v4 < v5 < v6, and T1 < T2 < T3 are all preset values.

[0167] When the seawater temperature is <T4, T4=5℃, the electromagnetic seawater pump 21 operates at 100 rpm / min less than its normal speed; when T4≤seawater temperature<T5, T5=15℃, the electromagnetic seawater pump 21 operates at its normal speed; when T5≤seawater temperature, the electromagnetic seawater pump 21 operates at 100 rpm / min more than its normal speed.

[0168] Freshwater circulation path: The internal water circuit of the engine leads to the internal circulating water temperature sensor 40, which then leads to the first temperature regulating valve 10 (electric three-way valve); one path of the first temperature regulating valve 10 returns directly to the engine via the electromagnetic freshwater pump 20 (small circulation), while the other path returns to the engine via the heat exchanger 30 after heat exchange (large circulation).

[0169] The internal circulating water temperature sensor 40, the electromagnetic freshwater pump 20, and the first temperature regulating valve 10 are respectively connected to the electronic control unit (ECU). The internal circulating water temperature sensor 40 sends the detected internal circulating water temperature to the ECU, the ECU transmits the speed signal to the electromagnetic freshwater pump 20, and the ECU transmits the opening signal to the first temperature regulating valve 10.

[0170] During seawater circulation, the electromagnetic seawater pump 21 sends seawater to the heat exchanger 30 via the seawater temperature sensor 41. After heat exchange, the seawater is discharged. The seawater temperature sensor 41 and the electromagnetic seawater pump 21 are respectively connected to the ECU. The seawater temperature sensor 41 transmits the detected seawater temperature to the ECU, and the ECU transmits the speed signal to the electromagnetic seawater pump 21.

[0171] In this embodiment, the engine energy-saving thermal management system also includes a lubrication device that is communicatively connected to the electronic control unit. The lubrication device includes an oil heater 32, a second temperature regulating valve 11, an electric pre-supply oil pump 22, and an oil temperature detection unit. After the engine is running normally, the electronic control unit controls the oil heater 32 to stop heating. In this embodiment, the oil temperature detection unit includes an oil temperature sensor 42.

[0172] In standby mode, the electric pre-supply oil pump 22 draws oil from the engine oil passage, flows through the oil temperature sensor 42, and then sends it to the second temperature regulating valve 11. The second temperature regulating valve 11 is an electric three-way valve. One path directly sends the oil into the engine, and the other path is heated by the oil heater 32 before being sent into the engine.

[0173] The oil temperature sensor 42, the electric pre-supply oil pump 22, and the second temperature regulating valve 11 are respectively connected to the ECU for communication. The oil temperature sensor 42 sends the detected oil temperature to the ECU. The ECU transmits a run or stop signal to the electric pre-supply oil pump 22 and transmits an opening signal to the second temperature regulating valve.

[0174] When the engine is in standby mode, the electronic control unit compares the oil temperature with the preset oil temperature. Based on the comparison result, it controls the oil heater 32 to heat the oil according to the preset oil power, or controls the oil heater 32 to stop heating and triggers the oil alarm. The electronic control unit also controls the opening degree of the second temperature regulating valve 11 based on the comparison result.

[0175] Specifically, when the oil temperature is less than t1, the electronic control unit controls the second temperature regulating valve 11 to allow the oil to flow to the oil heater 32 for preheating. When t1 ≤ oil temperature < t2, the electronic control unit controls the second temperature regulating valve 11 to be in a half-open state, controlling the oil to flow back to the engine internal oil passage after being heated by the oil heater 32, and the other path to flow back to the engine internal oil passage. When t2 ≤ oil temperature < t3, the electronic control unit controls the second temperature regulating valve 11 to be in a fully open state, allowing the oil to flow directly back to the engine internal oil passage, and also controls the oil heater 32 to stop heating. When t3 ≤ oil temperature, the system triggers the oil alarm and controls the oil heater 32 to stop heating.

[0176] In this embodiment, the engine energy-saving thermal management system also includes an intake device that is communicatively connected to the electronic control unit. The intake device includes an air filter, an intake heater 33, and an intake temperature detection unit. In this embodiment, the intake temperature detection unit includes an intake temperature sensor 43.

[0177] After being filtered by the air filter, the air temperature is first detected by the intake air temperature sensor 43, then heated by the intake air heater 33, and finally sent to the engine. The intake air temperature sensor 43 and the intake air heater 33 are respectively connected to the ECU for communication. The intake air temperature sensor 43 transmits the detected intake air temperature to the ECU, and the ECU transmits a heating signal to the intake air heater 33.

[0178] When the engine starts, the electronic control unit controls the intake air heater 33 to start heating when the intake air temperature is less than the preset intake air temperature H1, that is, when the intake air temperature is < preset intake air temperature H1. When the intake air temperature is greater than or equal to the preset intake air temperature H3, that is, when the intake air temperature is ≥ preset intake air temperature H3, the electronic control unit controls the intake air heater 33 to stop heating.

[0179] When the engine is running normally, the electronic control unit compares the intake air temperature with the preset intake air temperature. Based on the comparison result, it controls the intake air heater 33 to heat according to the preset intake air power, or controls the intake air heater 33 to stop heating.

[0180] Specifically, when the intake air temperature is less than H1, the electronic control unit controls the intake heater 33 to heat according to the preset intake power P1; when H1 ≤ intake air temperature < H2, the electronic control unit controls the intake heater 33 to heat according to the preset intake power P2; when H2 ≤ intake air temperature < H3, the electronic control unit controls the intake heater 33 to heat according to the preset intake power P3; when H3 ≤ intake air temperature, the electronic control unit controls the intake heater 33 to stop heating, where P1 > P2 > P3.

[0181] In other embodiments of the present invention, a manual control device is also included. The manual control device includes a human-machine interaction unit that is communicatively connected to the ECU. The human-machine interaction unit may include, but is not limited to, three buttons, specifically a low ambient temperature button, a medium ambient temperature button, and a high ambient temperature button. If the automatic mode fails, it can be switched to manual mode to achieve control redundancy.

[0182] like Figure 2 As shown, the engine energy-saving thermal management system of the present invention mainly includes a cooling device, a lubrication device, an intake device, and a manual control device. When the marine engine is operating in an extremely cold environment, the oil heater 32 heats the oil before starting, the cylinder liner water heater 31 preheats the internal circulating water before starting, and the intake heater 33 heats the air at different power according to the real-time temperature of the intake air, which effectively improves the starting performance of the engine.

[0183] During normal engine operation, this invention can detect the real-time internal circulating water temperature and seawater temperature, and match different speeds for the electromagnetic freshwater pump 20 according to the internal circulating water temperature, and match different speeds for the electromagnetic seawater pump 21 according to the seawater temperature. This reduces energy consumption during operation, lowers user operating costs, and effectively keeps the internal circulating water within the operating temperature range, reducing the impact on engine life caused by excessively high or low internal circulating water temperatures.

[0184] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent improvements to an engine energy-saving thermal management method and system 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 energy-saving thermal management method, applied to an engine energy-saving thermal management system, the engine energy-saving thermal management system comprising a cooling device, the cooling device comprising a cylinder liner water heater, a first temperature regulating valve, a freshwater pump, and a seawater pump; characterized in that, The thermal management method includes the following steps: S10, Obtain the internal circulating water temperature; S20. After the engine is running normally, control the cylinder liner water heater to stop heating, determine whether the internal circulating water temperature is less than T1, determine whether the internal circulating water temperature is within the range of [T1, T2), determine whether the internal circulating water temperature is within the range of [T2, T3), and determine whether the internal circulating water temperature is greater than or equal to T3, where T1 < T2 < T3. S30. If the internal circulating water temperature is less than T1, generate the corresponding first water temperature control signal. If the internal circulating water temperature is within the range of [T1, T2), a corresponding second water temperature control signal is generated; If the internal circulating water temperature is within the range of [T2, T3), a corresponding third water temperature control signal is generated; If the internal circulating water temperature is greater than or equal to T3, a corresponding internal circulating water alarm signal will be generated. S40. Based on the first water temperature control signal, control the first temperature regulating valve to open the small circulation, control the freshwater pump to run at a slow speed V1, and control the seawater pump to stop running. Based on the second water temperature control signal, control the first temperature regulating valve to be in a half-open state, control the freshwater pump to run at medium speed V2, and control the seawater pump to run at slow speed V4. Based on the third water temperature control signal, control the first temperature regulating valve to be fully open, control the freshwater pump to run at high speed V3, and control the seawater pump to run at medium speed V5. Based on the internal circulation water alarm signal, control the freshwater pump to run at high speed V3 and control the seawater pump to run at high speed V6, triggering the internal circulation water temperature alarm.

2. The engine energy-saving thermal management method according to claim 1, characterized in that, The thermal management method further includes the following steps: S50, obtain seawater temperature; S60. Determine whether the seawater temperature is less than T4, determine whether the seawater temperature is within the range [T4, T5), and determine whether the seawater temperature is greater than or equal to T5. S70. If the seawater temperature is less than T4, generate the corresponding first revision signal; If the seawater temperature is within the range of [T4, T5), a corresponding sustaining signal is generated; If the seawater temperature is greater than or equal to T5, a corresponding second revision signal is generated; S80. Based on the first revision signal, control the seawater pump speed to decrease by n1; Based on the maintenance signal, control the seawater pump to maintain its speed; Based on the second revised signal, the speed of the seawater pump is increased by n2.

3. The engine energy-saving thermal management method according to claim 1, characterized in that, Following S10, the following steps are also included: When the engine is in standby mode, check if the internal circulating water temperature is lower than T1; If the internal circulating water temperature is less than T1, the cylinder liner water heater will be started to heat until the internal circulating water temperature reaches T1 and then heating will stop.

4. The engine energy-saving thermal management method according to claim 1, characterized in that, The engine energy-saving thermal management system also includes a lubrication device, which includes an oil heater, a second temperature control valve, and an electric pre-supply oil pump. S10 further includes: acquiring the engine oil temperature; S20 further includes: when the engine is running normally, controlling the oil heater to stop heating; Between S10 and S20, the following step is also included: S12. When the engine is in standby mode, control the electric pre-supply oil pump to start, determine whether the oil temperature is less than t1, determine whether the oil temperature is within the range of [t1, t2), determine whether the oil temperature is within the range of [t2, t3), and determine whether the oil temperature is greater than or equal to t3. S14. If the oil temperature is less than t1, generate the corresponding first oil temperature control signal; If the oil temperature is within the range of [t1, t2), a corresponding second oil temperature control signal is generated; If the oil temperature is within the range of [t2, t3), a corresponding third oil temperature control signal is generated; If the oil temperature is greater than or equal to t3, a corresponding oil alarm signal will be generated. S16. Based on the first oil temperature control signal, control the second temperature regulating valve to allow the oil to flow to the oil heater to preheat the oil; Based on the second oil temperature control signal, the second temperature regulating valve is controlled to be in a half-open state, and the oil is divided into two paths. One path of oil is heated by the oil heater and then flows back to the internal oil passage of the engine, while the other path of oil flows directly back to the internal oil passage of the engine. Based on the third oil temperature control signal, the second temperature regulating valve is controlled to be fully open, so that the oil flows directly back to the internal oil passage of the engine and the oil heater is controlled to stop heating. Based on the oil alarm signal, the oil heater is controlled to stop heating, triggering the oil alarm.

5. The engine energy-saving thermal management method according to claim 4, characterized in that, The engine energy-saving thermal management system also includes an air intake device, which includes an air filter and an air intake heater. S10 further includes: acquiring the intake air temperature; The S20 further includes: the engine is running normally, determining whether the intake air temperature is less than H1, determining whether the intake air temperature is within the range of [H1, H2), determining whether the intake air temperature is within the range of [H2, H3), and determining whether the intake air temperature is greater than or equal to H3. The S30 further includes: If the intake air temperature is less than H1, a corresponding first temperature control signal is generated; If the intake air temperature is within the range of [H1, H2), a corresponding second air temperature control signal is generated; If the intake air temperature is within the range of [H2, H3), a corresponding third temperature control signal is generated; If the intake air temperature is greater than or equal to H3, a corresponding stop signal is generated; The S40 further includes: Based on the first temperature control signal, control the intake heater to heat according to the preset intake power P1; Based on the second temperature control signal, control the intake heater to heat according to the preset intake power P2; According to the third temperature control signal, the intake heater is controlled to heat according to the preset intake power P3, where P1>P2>P3; Based on the stop signal, control the intake air heater to stop heating.

6. The engine energy-saving thermal management method according to claim 5, characterized in that, The thermal management method further includes the following steps: When the engine starts, if the intake air temperature is less than H1, the intake air heater is activated; if the intake air temperature is greater than or equal to H3, the intake air heater is deactivated.

7. The engine energy-saving thermal management method according to claim 5, characterized in that, The engine energy-saving thermal management system also includes a human-machine interaction unit; The thermal management method further includes the following steps: Acquire human-computer interaction signals; Determine whether the human-computer interaction signal is a low ambient temperature signal, a medium ambient temperature signal, or a high ambient temperature signal; Based on the comparison results, the cooling device, the lubrication device, and / or the air intake device are controlled according to a preset mode.

8. An engine energy-saving thermal management system, comprising an electronic control unit and a cooling device connected in communication, wherein the cooling device includes a cylinder liner water heater, a first temperature regulating valve, a freshwater pump, a heat exchanger, a seawater pump, an internal circulating water temperature detection unit, and a seawater temperature detection unit connected in communication with the engine; wherein the internal circulating water temperature detection unit detects the internal circulating water temperature and transmits it to the electronic control unit, and the seawater temperature detection unit detects the seawater temperature and transmits it to the electronic control unit; characterized in that, After the engine is running normally, the electronic control unit compares the internal circulating water temperature with the preset internal circulating water temperature. Based on the comparison result, it controls the first temperature regulating valve, controls the fresh water pump to run at different speeds, and controls the seawater pump to run at different speeds. The electronic control unit compares the seawater temperature with the preset seawater temperature, and controls the seawater pump to reduce, maintain, or increase its normal rotation speed based on the comparison result.

9. The engine energy-saving thermal management system according to claim 8, characterized in that, It also includes a lubrication device that is communicatively connected to the electronic control unit. The lubrication device includes an oil heater, a second temperature regulating valve, an electric pre-supply oil pump, and an oil temperature detection unit. The oil temperature detection unit detects the oil temperature and transmits it to the electronic control unit. After the engine is running normally, the electronic control unit controls the oil heater to stop heating; When the engine is in standby mode, the electronic control unit compares the oil temperature with the preset oil temperature. Based on the comparison result, it controls the oil heater to heat the oil according to the preset oil power or controls the oil heater to stop heating and trigger the oil alarm.

10. The engine energy-saving thermal management system according to claim 8, characterized in that, It also includes an air intake device that is communicatively connected to the electronic control unit. The air intake device includes an air filter, an air intake heater, and an air intake temperature detection unit. The air intake temperature detection unit detects the air intake temperature and transmits it to the electronic control unit. When the engine starts, the electronic control unit controls the intake heater to start heating when the intake air temperature is lower than the preset intake air temperature H1, and controls the intake heater to stop heating when the intake air temperature is greater than or equal to the preset intake air temperature H3. When the engine is running normally, the electronic control unit compares the intake air temperature with the preset intake air temperature. Based on the comparison result, it controls the intake air heater to heat according to the preset intake air power or controls the intake air heater to stop heating.

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