Thermal management control system of small-displacement engine

Abstract

The invention discloses a thermal management control system for a small-displacement engine, belongs to the technical field of thermal management of engines, and solves the technical problem of overheating during operation of the existing small-displacement engine. The system comprises a cylinder body, a cylinder cover, a temperature control module, an air cooling radiator, a water pump, a preheater, an expansion water tank, an exhaust pipe water jacket, a control module, a radiator, a thermostat, an oil tank, a first control valve, a second control valve and a third control valve, a water heat exchanger is arranged in the oil tank, the cylinder body is provided with a first temperature sensor, and the cylinder cover is provided with a second temperature sensor. The thermostat is provided with a third temperature sensor, the oil tank is provided with a fourth temperature sensor, and the control module is electrically connected with the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor. The oil supply temperature management mode and the engine body temperature management mode are determined through the cylinder body temperature, the cylinder cover temperature, the cooling water temperature and the fuel oil temperature, so that the engine body of the small-displacement engine is prevented from being overheated, and the performance of the small-displacement engine is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine thermal management, and more particularly to a thermal management control system for a small-displacement engine. Background Art

[0002] In order to adapt to various small equipment, the miniaturization and lightness of engines are of great significance in modern science and engineering. However, due to the small size and limited surface area of ​​small-displacement engines, the heat dissipation efficiency is relatively low, making it difficult to effectively manage heat.

[0003] Traditional temperature sensors and thermal management systems cannot accurately sense and control changes in the internal temperature of small-displacement engines, which may cause the engine temperature to be too high or too low, thereby affecting the performance and reliability of small-displacement engines. In order to solve the overheating problem during high-load operation or long-term operation, small-displacement engines require an efficient thermal management system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide a thermal management control system for a small-displacement engine, which can effectively solve the overheating problem during high-load operation or long-term operation.

[0005] The technical problem of the present invention is: a small displacement engine thermal management control system, comprising a cylinder body, the cylinder body is equipped with a cylinder head, and also comprises a temperature control module, an air-cooled radiator, a water pump, a preheater, an expansion water tank, an exhaust pipe water jacket, a control module, a radiator, a thermostat, an oil tank, a first control valve, a second control valve, and a third control valve, wherein a water heat exchanger is arranged in the oil tank;

[0006] The first outlet of the water pump is connected to the cylinder cooling water channel of the cylinder body and the cylinder head cooling water channel of the cylinder head respectively through the first water pump outlet pipe, the cylinder cooling water channel is connected to the first inlet of the temperature control module through the cylinder outlet pipe, and the cylinder head cooling water channel is connected to the second inlet of the temperature control module through the cylinder head outlet pipe; the expansion water tank is connected to the preheater and the first inlet of the water pump in sequence through the first water pump inlet pipe, the first outlet of the temperature control module is connected to the air-cooled radiator and the first water pump inlet pipe in sequence through the first temperature control outlet pipe, the second inlet of the water pump is connected to the first outlet of the first control valve through the second water pump inlet pipe, the second outlet of the temperature control module is connected to the second water pump inlet pipe through the second temperature control outlet pipe, the second outlet of the water pump is connected to the inlet of the thermostat through the second water pump outlet pipe, and the first outlet of the thermostat is connected to the first temperature control outlet pipe. The inlet of the first control valve is connected, the inlet of the exhaust pipe water jacket is connected to the second outlet of the first control valve through the exhaust inlet pipe, the outlet of the exhaust pipe water jacket is connected to the first inlet of the second control valve through the exhaust outlet pipe, the second outlet of the thermostat is connected to the second inlet of the second control valve through the second thermostat outlet pipe, the first inlet of the water heat exchanger is connected to the first outlet of the second control valve through the first heat exchange inlet pipe, the second inlet of the water heat exchanger is connected to the second outlet of the radiator through the second heat exchange inlet pipe, the outlet of the water heat exchanger is connected to the first inlet of the third control valve through the heat exchange outlet pipe, the first outlet of the radiator is connected to the second inlet of the third control valve through the heat dissipation outlet pipe, the inlet of the radiator is connected to the second outlet of the second control valve through the heat dissipation inlet pipe, and the first water pump inlet pipe is connected to the outlet of the third control valve through the connecting pipe;

[0007] The cylinder body is provided with a first temperature sensor, the cylinder head is provided with a second temperature sensor, the thermostat is provided with a third temperature sensor, the fuel tank is provided with a fourth temperature sensor, and the control module is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor.

[0008] As a further improvement, the cooling water threshold Ta is set to 80°C and Tb is set to 95°C; the fuel temperature threshold Tc is set to 20°C and Td is set to 40°C; the engine temperature threshold Te is set to 75°C and Tf is set to 95°C; the cylinder head temperature threshold Tg is set to 200°C and Th is set to 250°C;

[0009] The control module predicts the cylinder temperature T1 at the next moment by using a multilayer perceptron according to the temperature currently detected by the first temperature sensor, predicts the cylinder head temperature T2 at the next moment according to the temperature currently detected by the second temperature sensor, predicts the cooling water temperature T3 at the next moment according to the temperature currently detected by the third temperature sensor, and predicts the fuel temperature T4 at the next moment according to the temperature currently detected by the fourth temperature sensor; the control module compares T1 with the engine temperature threshold, T2 with the cylinder head temperature threshold, T3 with the cooling water threshold, and T4 with the fuel temperature threshold to determine the fuel supply temperature management mode and the engine temperature management mode.

[0010] Furthermore, the oil supply temperature management mode includes:

[0011] Fuel supply mode A is suitable for the scenario where both the cooling water temperature T1 and the fuel temperature T2 are relatively low. The cooling water flows out from the thermostat to the first control valve, and then turns to the exhaust pipe water jacket to absorb waste heat, thereby increasing the cooling water temperature. After absorbing the heat, the cooling water flows through the second control valve to the water heat exchanger in the fuel tank to heat the fuel with a lower temperature, thereby increasing the fuel temperature. Then, the cooling water flows to the third control valve, and is pumped back into circulation by the water pump.

[0012] Fuel supply mode B is suitable for the scenario where the cooling water temperature T1 is at the normal working temperature, but the fuel temperature T2 still needs to be heated. The cooling water flows out of the thermostat in two parts; one part flows directly to the second control valve and then enters the water heat exchanger to heat the fuel; the other part flows to the first control valve and then continues to enter the exhaust pipe water jacket for heating. The heated cooling water is directly supplied to the second control valve and enters the water heat exchanger to heat the fuel; after heating the fuel, the cooling water flows to the third control valve and is pumped back into the circulation by the water pump;

[0013] Fuel supply C mode is applicable to the scenario where the cooling water temperature T1 and the fuel temperature T2 are both within the normal operating range, and the cooling water flowing out of the thermostat is directly supplied to the first control valve and then pumped back into circulation by the water pump;

[0014] Fuel supply D mode is suitable for the scenario where both the cooling water temperature T1 and the fuel temperature T2 are higher than the normal operating range. The cooling water flows out of the thermostat, flows through the second control valve and flows to the radiator for cooling, thereby lowering the cooling water temperature. After cooling, the cooling water enters the water heat exchanger in the fuel tank to absorb the heat of the high-temperature fuel and lower the fuel temperature.

[0015] Furthermore, the body temperature management mode includes:

[0016] In the engine body A mode, first, close the ball valve at the outlet of the engine block cooling water channel, then quickly heat the engine block by heating it, and control the pressure loss and flow rate of the system by adjusting the opening degree of the bypass valve of the engine block cooling water channel, so as to achieve the function of rapid warm-up;

[0017] In the engine body B mode, the ball valve at the outlet of the engine block cooling water channel will gradually open, but at this time the large circulation system still remains closed. This configuration allows the engine block and the cylinder head to be cooled separately, so as to achieve more precise temperature control, and is applicable to the situation where the engine block and the cylinder head need to be cooled separately;

[0018] In the engine body C mode, the small circulation system will gradually close, and at the same time the large circulation system will gradually open completely. The overall temperature of the cooling system is reduced by the radiator, so that the function of cooling on demand can be achieved according to actual needs, and it is applicable to the situation where continuous heat dissipation is required during long-term operation; In addition, when the first temperature sensor detects that the engine block is overheated, the control module will send a signal to warn the operator.

[0019] Further, when T1 < Te and T2 < Tg and T3 < Ta and T4 < Tc, the control module selects to execute the engine body A mode and the fuel supply A mode, and the preheater works;

[0020] When T1 < Te and T2 < Tg and Ta < T3 < Tb and T4 < Tc, the control module selects to execute the engine body A mode and the fuel supply B mode, and the preheater does not work.

[0021] Further, when T1 < Te and T2 < Tg and Ta < T3 < Tb and Tc < T4 < Td, the control module selects to execute the engine body A mode and the fuel supply C mode;

[0022] When T1 < Te and T2 < Tg and T3 > Tb and T4 > Td, the control module selects to execute the engine body A mode and the fuel supply C mode.

[0023] Further, when T1 > Tf and T2 < Th and T3 < Ta and T4 < Tc, the control module selects to execute the engine body B mode and the fuel supply A mode;

[0024] When T1 > Tf and T2 < Th and Ta < T3 < Tb and T4 < Tc, the control module selects to execute the engine body B mode and the fuel supply B mode.

[0025] Further, when T1 > Tf and T2 < Th and Ta < T3 < Tb and Tc < T4 < Td, the control module selects to execute the engine body B mode and the fuel supply C mode;

[0026] When T1 > Tf, T2 < Th, T3 > Tb, and T4 > Td, the control module selects to execute the body B mode and the fuel supply D mode.

[0027] Further, when T1 > Tf, T2 > Th, T3 < Ta, and T4 < Tc, the control module selects to execute the body C mode and the fuel supply C mode.

[0028] Further, when T1 > Tf, T2 > Th, T3 > Ta, and T4 > Tc, the control module selects to execute the body C mode and the fuel supply D mode.

[0029] Beneficial Effects

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. The fuel supply heat cycle of the present invention will control the fuel temperature, improve the cold start performance of the engine, and ensure the efficiency of fuel injection and atomization. If the fuel temperature is too high, it may cause premature fuel volatilization and deflagration; if the fuel temperature is too low, it may affect the atomization effect and result in incomplete combustion. By controlling the temperatures of the cooling water and fuel, the thermal efficiency of the engine can be improved, energy loss can be reduced, and thus the overall fuel efficiency can be increased.

[0032] 2. The body heat cycle of the present invention can improve the cold start performance of the engine, monitor the engine temperature while controlling the engine at the optimal operating temperature, and prevent the engine body from overheating.

[0033] 3. The thermal management system of the present invention can reduce the emissions of small-displacement engines. By controlling the fuel temperature, the thermal management system can optimize the combustion process, reduce exhaust emissions, and reduce environmental pollution.

[0034] 4. The thermal management system of the present invention can effectively utilize waste heat, reduce energy waste, and improve the overall energy utilization efficiency of the system. Brief Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the present invention;

[0036] Figure 2 is a flowchart for judging the fuel supply temperature management mode and the body temperature management mode in the present invention.

[0037] Among them: 1-cylinder body, 2-cylinder head, 3-temperature control module, 4-air cooling radiator, 5-water pump, 6-preheater, 7-expansion water tank, 8-exhaust pipe water jacket, 9-control module, 10-radiator, 11-thermostat, 12-fuel tank, 13-first control valve, 14-second control valve, 15-third control valve, 16-water heat exchanger, 17-first water pump outlet pipe, 18-cylinder cooling water channel, 19-cylinder head cooling water channel, 20-cylinder outlet pipe, 21-cylinder head outlet pipe, 22-first water pump inlet pipe , 23-first temperature control outlet pipe, 24-second water pump inlet pipe, 25-second temperature control outlet pipe, 26-second water pump outlet pipe, 27-first section temperature outlet pipe, 28-exhaust inlet pipe, 29-exhaust outlet pipe, 30-second section temperature outlet pipe, 31-first heat exchange inlet pipe, 32-second heat exchange inlet pipe, 33-heat exchange outlet pipe, 34-heat dissipation outlet pipe, 35-heat dissipation inlet pipe, 36-connecting pipe, 37-first temperature sensor, 38-second temperature sensor, 39-third temperature sensor, 40-fourth temperature sensor. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0039] See also Figure 1-2 A thermal management control system for a small-displacement engine includes a cylinder block 1, a cylinder head 2 installed on the cylinder block 1, a temperature control module 3, an air-cooled radiator 4, a water pump 5, a preheater 6, an expansion water tank 7, an exhaust pipe water jacket 8, a control module 9, a radiator 10, a thermostat 11, a fuel tank 12, a first control valve 13, a second control valve 14, and a third control valve 15. A water heat exchanger 16 is arranged in the fuel tank 12.

[0040] The first outlet of the water pump 5 is connected to the cylinder cooling water channel 18 of the cylinder 1 and the cylinder head cooling water channel 19 of the cylinder head 2 respectively through the first water pump outlet pipe 17, the cylinder cooling water channel 18 is connected to the first inlet of the temperature control module 3 through the cylinder outlet pipe 20, and the cylinder head cooling water channel 19 is connected to the second inlet of the temperature control module 3 through the cylinder head outlet pipe 21; the expansion water tank 7 is connected to the preheater 6 and the first inlet of the water pump 5 in sequence through the first water pump inlet pipe 22, the first outlet of the temperature control module 3 is connected to the air-cooled radiator 4 and the first water pump inlet pipe 22 in sequence through the first temperature control outlet pipe 23, the second inlet of the water pump 5 is connected to the first outlet of the first control valve 13 through the second water pump inlet pipe 24, the second outlet of the temperature control module 3 is connected to the second water pump inlet pipe 24 through the second temperature control outlet pipe 25, the second outlet of the water pump 5 is connected to the inlet of the thermostat 11 through the second water pump outlet pipe 26, and the first outlet of the thermostat 11 is connected to the first control valve 13 through the first temperature control outlet pipe 27 13, the inlet of the exhaust pipe water jacket 8 is connected to the second outlet of the first control valve 13 through the exhaust inlet pipe 28, the outlet of the exhaust pipe water jacket 8 is connected to the first inlet of the second control valve 14 through the exhaust outlet pipe 29, the second outlet of the thermostat 11 is connected to the second inlet of the second control valve 14 through the second thermostat outlet pipe 30, the first inlet of the water heat exchanger 16 is connected to the first outlet of the second control valve 14 through the first heat exchange inlet pipe 31, the second inlet of the water heat exchanger 16 is connected to the second outlet of the radiator 10 through the second heat exchange inlet pipe 32, the outlet of the water heat exchanger 16 is connected to the first inlet of the third control valve 15 through the heat exchange outlet pipe 33, the first outlet of the radiator 10 is connected to the second inlet of the third control valve 15 through the heat dissipation outlet pipe 34, the inlet of the radiator 10 is connected to the second outlet of the second control valve 14 through the heat dissipation inlet pipe 35, and the first water pump inlet pipe 22 is connected to the outlet of the third control valve 15 through the connecting pipe 36.

[0041] The cylinder block 1 is provided with a first temperature sensor 37 , the cylinder head 2 is provided with a second temperature sensor 38 , the thermostat 11 is provided with a third temperature sensor 39 , the fuel tank 12 is provided with a fourth temperature sensor 40 , and the control module 9 is electrically connected to the first temperature sensor 37 , the second temperature sensor 38 , the third temperature sensor 39 , and the fourth temperature sensor 40 .

[0042] The control module 9 includes an ECU, a memory, a processor, and a computer program stored in and run on the processor. The multi-layer perceptron (MLP) optimized by the whale optimization algorithm (WOA) in the computer program has been trained using historical engine data and can obtain various temperature control thresholds based on the temperature parameters collected by the sensor. The ECU selects two cyclic thermal management modes based on the temperature control thresholds and outputs control signals to various components.

[0043] The thermostat 11 is an important component in the thermal management system of a small displacement engine. Its main function is to control the flow of coolant to maintain the engine running within a suitable temperature range. The built-in third temperature sensor 39 can measure the temperature T3 of the cooling water and transmit the measured data to the control module.

[0044] The oil supply heat cycle is equipped with three valves, namely the first control valve 13, the second control valve 14 and the third control valve 15, which can realize four different operation modes. The cycle adopts an electromagnetic reversing valve, which changes the position of the valve core by controlling the power on and off of the electromagnetic coil, thereby adjusting the flow direction of the fluid. The temperature control module in the body heat cycle is controlled by a ball valve driven by an electric motor. By adjusting the opening of the ball valve, the flow of the coolant between the cylinder block, the radiator and the bypass pipe can be actively distributed.

[0045] The exhaust pipe water jacket 8 adopts a surround type water jacket arrangement, which not only plays the role of heat insulation and cooling to prevent the exhaust pipe from overheating and causing damage to surrounding components or vehicle structures, but also realizes the recovery of waste heat, reduces the heat dissipation of the engine and improves the heat energy conversion efficiency.

[0046] The water pump 5 is responsible for pushing the cooling water into the circulation of the thermal management system to ensure that the cooling water can circulate effectively and transfer heat.

[0047] The water heat exchanger 16 is located in the fuel tank 12. When the cooling water passes through the water heat exchanger 16, the heat is transferred to the fuel in the fuel tank 12, thereby raising the fuel temperature to a suitable operating temperature range. The fourth temperature sensor 40 built into the fuel tank 12 can measure the temperature T4 of the fuel and transmit the measured data to the control module.

[0048] According to different usage scenarios, the radiator 10 of the thermal management system can be an air-cooled radiator or a sea-fresh water radiator to reduce the excessively high cooling water temperature in a specific mode.

[0049] The temperature control module 3 is a two-input and two-output structure, and its inlet is connected to the cylinder head outlet (the outlet of the cylinder head cooling water channel 19) and the cylinder body outlet (the outlet of the cylinder body cooling water channel 18). Among them, the cylinder head outlet adopts a normally open mode, that is, it always remains open to ensure the cooling effect of the cylinder head. The motor that receives the ECU control signal controls the ball valve at the cylinder body outlet to adjust the opening, thereby accurately controlling the coolant flow to the radiator and bypass pipe.

[0050] In order to better achieve thermal management control, the cooling water threshold Ta is set to 80°C and Tb is set to 95°C; the fuel temperature threshold Tc is set to 20°C and Td is set to 40°C; the engine temperature threshold Te is set to 75°C and Tf is set to 95°C; the cylinder head temperature threshold Tg is set to 200°C and Th is set to 250°C.

[0051] The control module 9 predicts the cylinder temperature T1 at the next moment by using a multi-layer perceptron according to the temperature currently detected by the first temperature sensor 37, predicts the cylinder head temperature T2 at the next moment by using a multi-layer perceptron according to the temperature currently detected by the second temperature sensor 38, predicts the cooling water temperature T3 at the next moment by using a multi-layer perceptron according to the temperature currently detected by the third temperature sensor 39, and predicts the fuel temperature T4 at the next moment by using a multi-layer perceptron according to the temperature currently detected by the fourth temperature sensor 40; the control module 9 compares T1 with the engine temperature threshold, T2 with the cylinder head temperature threshold, T3 with the cooling water threshold, and T4 with the fuel temperature threshold to determine the fuel supply temperature management mode and the engine temperature management mode.

[0052] The computer program built into the control module is trained with historical engine operation data as a data set, and uses a multi-layer perceptron to predict the cylinder temperature T1, cylinder head temperature T2, cooling water temperature T3 and fuel temperature T4 at the next moment, thereby achieving active thermal management. The historical engine operation data is divided into 70% as a training set and 30% as a validation set. The trained prediction model will be evaluated for performance through the validation set.

[0053] The implementation flow chart of each mode of thermal management system is as follows Figure 2 As shown, the oil supply heat cycle ensures that the oil temperature is normal to reduce the heat load of the engine body, and the engine body heat cycle ensures that the engine can operate within the normal temperature range. The engine body heat cycle has a higher priority than the oil supply heat cycle.

[0054] Among them, the oil supply temperature management modes include:

[0055] Fuel supply mode A is suitable for scenarios where both the cooling water temperature T1 and the fuel temperature T2 are relatively low. The cooling water flows out of the thermostat 11 to the first control valve 13, and then turns to the exhaust pipe water jacket 8 to absorb waste heat and increase the cooling water temperature; the cooling water after absorbing the heat flows through the second control valve 14 to the water heat exchanger 16 in the fuel tank 12 to heat the fuel with a lower temperature and increase the fuel temperature; then the cooling water flows to the third control valve 15 and is pumped back into the circulation by the water pump 5.

[0056] Fuel supply mode B is suitable for the scenario where the cooling water temperature T1 is at the normal working temperature, but the fuel temperature T2 still needs to be heated. The cooling water flows out of the thermostat 11 in two parts; one part flows directly to the second control valve 14 and then enters the water heat exchanger 16 to heat the fuel; the other part flows to the first control valve 13 and then continues to enter the exhaust pipe water jacket 8 for heating. The heated cooling water is directly supplied to the second control valve 14 and enters the water heat exchanger 16 to heat the fuel; after heating the fuel, the cooling water flows to the third control valve 15 and is pumped back into the circulation by the water pump 5.

[0057] Fuel supply mode C is applicable to the scenario where both the cooling water temperature T1 and the fuel temperature T2 are within the normal operating range. The cooling water flowing out of the thermostat 11 is directly supplied to the first control valve 13 and then pumped back into the circulation by the water pump 5.

[0058] Fuel supply mode D is applicable to the scenario where both the cooling water temperature T1 and the fuel temperature T2 are higher than the normal operating range. All the cooling water flows out of the thermostat 11, passes through the second control valve 14 and then flows into the radiator 10 for cooling to reduce the cooling water temperature. After cooling, the cooling water enters the water heat exchanger 16 in the fuel tank 12 to absorb the heat of the high-temperature fuel and reduce the fuel temperature.

[0059] The engine body temperature management mode includes:

[0060] Engine body mode A: First, close the ball valve at the outlet of the cylinder block cooling water channel 18, and then quickly raise the temperature of the cylinder block 1 by heating it (i.e., fuel enters the cylinder block 1 for combustion and work). Control the pressure loss and flow rate of the system by adjusting the opening of the bypass valve of the cylinder block cooling water channel 18, so as to achieve the function of rapid warm-up. This mode is mainly used in scenarios where the temperature of the cylinder block needs to be quickly increased, such as cold start.

[0061] Engine body mode B: The ball valve at the outlet of the cylinder block cooling water channel 18 will gradually open, but the large circulation system remains closed at this time. This configuration allows for split cooling of the cylinder block 1 and the cylinder head 2, thus achieving more precise temperature control and is applicable to situations where the cylinder block and the cylinder head need to be cooled separately.

[0062] Engine body mode C: The small circulation system will gradually close, and at the same time, the large circulation system will gradually open completely. The overall temperature of the cooling system is reduced through the radiator 10, so that the function of cooling on demand can be achieved according to actual needs and is applicable to situations where continuous heat dissipation is required during long-term operation; in addition, when the first temperature sensor 37 detects that the cylinder block 1 is overheated, the control module 9 will send a signal to warn the operator.

[0063] Specifically, the judgment processes of the fuel supply temperature management mode and the engine body temperature management mode are as follows:

[0064] When T1 < Te and T2 < Tg and T3 < Ta and T4 < Tc, both the engine body and the fuel supply need to be heated at this time. The control module 9 selects to execute engine body mode A and fuel supply mode A, and the preheater 6 works, which can improve the engine starting performance even in extremely cold environments.

[0065] When T1 < Te and T2 < Tg and Ta < T3 < Tb and T4 < Tc, both the engine body and the fuel supply need to be heated at this time, and in the fuel supply heat circulation, the control module 9 selects to execute engine body mode A and fuel supply mode B, and the preheater 6 does not work.

[0066] When T1 < Te, T2 < Tg, Ta < T3 < Tb, and Tc < T4 < Td, in this case, the fuel supply temperature has entered the normal operating temperature range, but the engine block still needs to be heated. The control module 9 selects to execute the engine block A mode and the fuel supply C mode.

[0067] When T1 < Te, T2 < Tg, T3 > Tb, and T4 > Td, in this case, although the engine block still needs to be heated, the fuel temperature has exceeded the threshold. The control module 9 selects to execute the engine block A mode and the fuel supply C mode, and still maintains the fuel temperature at a relatively high level to increase the engine block heat load and achieve rapid temperature rise.

[0068] When T1 > Tf, T2 < Th, T3 < Ta, and T4 < Tc, in this case, the heat dissipation of the cylinder block and the cylinder head needs to be separated, and the cooling water and fuel temperatures are relatively low. The control module 9 selects to execute the engine block B mode and the fuel supply A mode to heat the fuel and the cooling water.

[0069] When T1 > Tf, T2 < Th, Ta < T3 < Tb, and T4 < Tc, in this case, the heat dissipation of the cylinder block and the cylinder head needs to be separated, and the fuel temperature is relatively low. The control module 9 selects to execute the engine block B mode and the fuel supply B mode to heat the fuel.

[0070] When T1 > Tf, T2 < Th, Ta < T3 < Tb, and Tc < T4 < Td, in this case, the heat dissipation of the cylinder block and the cylinder head needs to be separated, and the cooling water and fuel temperatures are in the normal operating state. The control module 9 selects to execute the engine block B mode and the fuel supply C mode.

[0071] When T1 > Tf, T2 < Th, T3 > Tb, and T4 > Td, in this case, the heat dissipation of the cylinder block and the cylinder head needs to be separated, and both the cooling water and fuel temperatures have exceeded the threshold. The control module 9 selects to execute the engine block B mode and the fuel supply D mode to reduce the oil and water temperatures.

[0072] When T1 > Tf, T2 > Th, T3 < Ta, and T4 < Tc, in this case, the engine block is overheated, and the cooling water and fuel temperatures are relatively low. The control module 9 selects to execute the engine block C mode and the fuel supply C mode to increase the heat dissipation of the engine block while maintaining a relatively low oil and water temperature to transfer the dissipated heat.

[0073] When T1 > Tf, T2 > Th, T3 > Ta, and T4 > Tc, in this case, the engine block is overheated, and the cooling water and fuel temperatures are relatively high. The control module 9 selects to execute the engine block C mode and the fuel supply D mode to increase the heat dissipation of the engine block while transferring the dissipated heat by reducing the oil and water temperatures.

[0074] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A thermal management control system for a small displacement engine, comprising a cylinder block (1), the cylinder block (1) being equipped with a cylinder head (2), characterized in that: It also includes a temperature control module (3), an air-cooled radiator (4), a water pump (5), a preheater (6), an expansion water tank (7), an exhaust pipe water jacket (8), a control module (9), a radiator (10), a thermostat (11), an oil tank (12), a first control valve (13), a second control valve (14), and a third control valve (15); a water heat exchanger (16) is provided in the oil tank (12); The first outlet of the water pump (5) is connected to the cylinder cooling water channel (18) of the cylinder body (1) and the cylinder head cooling water channel (19) of the cylinder head (2) through the first water pump outlet pipe (17); the cylinder cooling water channel (18) is connected to the first inlet of the temperature control module (3) through the cylinder outlet pipe (20); the cylinder head cooling water channel (19) is connected to the second inlet of the temperature control module (3) through the cylinder head outlet pipe (21); the expansion water tank (7) is connected to the preheater (6) and the first inlet of the water pump (5) in sequence through the first water pump inlet pipe (22); the temperature control module ( The first outlet of the water pump (3) is connected to the air-cooled radiator (4) and the first water pump inlet pipe (22) in sequence through the first temperature control outlet pipe (23), the second inlet of the water pump (5) is connected to the first outlet of the first control valve (13) through the second water pump inlet pipe (24), the second outlet of the temperature control module (3) is connected to the second water pump inlet pipe (24) through the second temperature control outlet pipe (25), the second outlet of the water pump (5) is connected to the inlet of the thermostat (11) through the second water pump outlet pipe (26), and the first outlet of the thermostat (11) is connected to the first temperature control outlet pipe (27). ) is connected to the inlet of the first control valve (13), the inlet of the exhaust pipe water jacket (8) is connected to the second outlet of the first control valve (13) through the exhaust inlet pipe (28), the outlet of the exhaust pipe water jacket (8) is connected to the first inlet of the second control valve (14) through the exhaust outlet pipe (29), the second outlet of the thermostat (11) is connected to the second inlet of the second control valve (14) through the second thermostat outlet pipe (30), the first inlet of the water heat exchanger (16) is connected to the first outlet of the second control valve (14) through the first heat exchange inlet pipe (31), and the water heat exchanger (1 The second inlet of the water heat exchanger (16) is connected to the second outlet of the radiator (10) through the second heat exchange inlet pipe (32), the outlet of the water heat exchanger (16) is connected to the first inlet of the third control valve (15) through the heat exchange outlet pipe (33), the first outlet of the radiator (10) is connected to the second inlet of the third control valve (15) through the heat dissipation outlet pipe (34), the inlet of the radiator (10) is connected to the second outlet of the second control valve (14) through the heat dissipation inlet pipe (35), and the first water pump inlet pipe (22) is connected to the outlet of the third control valve (15) through the connecting pipe (36); The cylinder body (1) is provided with a first temperature sensor (37), the cylinder head (2) is provided with a second temperature sensor (38), the thermostat (11) is provided with a third temperature sensor (39), the oil tank (12) is provided with a fourth temperature sensor (40), and the control module (9) is electrically connected to the first temperature sensor (37), the second temperature sensor (38), the third temperature sensor (39), and the fourth temperature sensor (40).

2. A small displacement engine thermal management control system according to claim 1, characterized in that: Set the cooling water threshold Ta to 80°C and Tb to 95°C; set the fuel temperature threshold Tc to 20°C and Td to 40°C; set the engine temperature threshold Te to 75°C and Tf to 95°C; set the cylinder head temperature threshold Tg to 200°C and Th to 250°C; The control module (9) predicts the cylinder temperature T1 at the next moment using a multilayer perceptron according to the temperature currently detected by the first temperature sensor (37), predicts the cylinder head temperature T2 at the next moment according to the temperature currently detected by the second temperature sensor (38), predicts the cooling water temperature T3 at the next moment according to the temperature currently detected by the third temperature sensor (39), and predicts the fuel temperature T4 at the next moment according to the temperature currently detected by the fourth temperature sensor (40); the control module (9) compares T1 with a body temperature threshold, T2 with a cylinder head temperature threshold, T3 with a cooling water threshold, and T4 with a fuel temperature threshold to determine a fuel supply temperature management mode and a body temperature management mode.

3. A small displacement engine thermal management control system according to claim 2, characterized in that: The oil supply temperature management mode includes: Fuel supply mode A is suitable for scenarios where both the cooling water temperature T1 and the fuel temperature T2 are relatively low. The cooling water flows out of the thermostat (11) into the first control valve (13), and then turns to the exhaust pipe water jacket (8) to absorb waste heat, thereby increasing the cooling water temperature. After absorbing the heat, the cooling water flows through the second control valve (14) to the water heat exchanger (16) in the fuel tank (12) to heat the fuel with a lower temperature, thereby increasing the fuel temperature. The cooling water then flows to the third control valve (15), and is pumped back into circulation by the water pump (5). Fuel supply mode B is suitable for the scenario where the cooling water temperature T1 is at the normal operating temperature, but the fuel temperature T2 still needs to be heated. The cooling water flows out of the thermostat (11) in two parts; one part flows directly to the second control valve (14) and then enters the water heat exchanger (16) to heat the fuel; the other part flows to the first control valve (13) and then continues to enter the exhaust pipe water jacket (8) to be heated. The heated cooling water is directly supplied to the second control valve (14) and enters the water heat exchanger (16) to heat the fuel; after heating the fuel, the cooling water flows to the third control valve (15) and is pumped back into the circulation by the water pump (5); Fuel supply mode C is applicable to the scenario where the cooling water temperature T1 and the fuel temperature T2 are both within the normal working range, and the cooling water flowing out of the thermostat (11) is directly supplied to the first control valve (13) and then pumped back into circulation by the water pump (5); The fuel supply D mode is applicable to the scenario where both the cooling water temperature T1 and the fuel temperature T2 are higher than the normal operating range. All the cooling water flows out of the thermostat (11), flows through the second control valve (14), and then flows into the radiator (10) for cooling to reduce the cooling water temperature. After cooling, the cooling water enters the water heat exchanger (16) in the fuel tank (12) to absorb the heat of the high-temperature fuel and reduce the fuel temperature.

4. A small displacement engine thermal management control system according to claim 3, characterized in that: The engine body temperature management mode includes: Engine body A mode: First, close the ball valve at the outlet of the cylinder block cooling water channel (18), then quickly heat the cylinder block (1) to raise its temperature rapidly, and control the pressure loss and flow rate of the system by adjusting the opening of the bypass valve of the cylinder block cooling water channel (18), so as to achieve the function of rapid warm-up. Engine body B mode: The ball valve at the outlet of the cylinder block cooling water channel (18) will gradually open, but the large circulation system remains closed at this time. This configuration allows the cylinder block (1) and the cylinder head (2) to be cooled separately, so as to achieve more precise temperature control, and is applicable to the situation where the cylinder block and the cylinder head need to be cooled separately. Engine body C mode: The small circulation system will gradually close, and at the same time the large circulation system will gradually open completely. The overall temperature of the cooling system is reduced by the radiator (10), so that the function of cooling on demand can be achieved according to actual needs, and it is applicable to the situation where continuous heat dissipation is required during long-term operation. In addition, when the first temperature sensor (37) detects that the cylinder block (1) is overheated, the control module (9) will send a signal to warn the operator.

5. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 < Te and T2 < Tg and T3 < Ta and T4 < Tc, the control module (9) selects to execute engine body A mode and fuel supply A mode, and the preheater (6) works. When T1 < Te and T2 < Tg and Ta < T3 < Tb and T4 < Tc, the control module (9) selects to execute engine body A mode and fuel supply B mode, and the preheater (6) does not work.

6. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 < Te and T2 < Tg and Ta < T3 < Tb and Tc < T4 < Td, the control module (9) selects to execute engine body A mode and fuel supply C mode. When T1 < Te and T2 < Tg and T3 > Tb and T4 > Td, the control module (9) selects to execute engine body A mode and fuel supply C mode.

7. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 > Tf and T2 < Th and T3 < Ta and T4 < Tc, the control module (9) selects to execute engine body B mode and fuel supply A mode. When T1 > Tf and T2 < Th and Ta < T3 < Tb and T4 < Tc, the control module (9) selects to execute engine body B mode and fuel supply B mode.

8. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 > Tf and T2 < Th and Ta < T3 < Tb and Tc < T4 < Td, the control module (9) selects to execute engine body B mode and fuel supply C mode. When T1 > Tf and T2 Tb and T4 > Td, the control module (9) selects to execute engine body B mode and fuel supply D mode.

9. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 > Tf and T2 > Th and T3 < Ta and T4 < Tc, the control module (9) selects to execute the body C mode and the fuel supply C mode.

10. A small displacement engine thermal management control system according to claim 4, characterized in that: When T1 > Tf and T2 > Th and T3 > Ta and T4 > Tc, the control module (9) selects to execute the body C mode and the fuel supply D mode.

Images