Heat dissipation system based on hydraulic mechanical transmission of heavy-duty vehicle

Abstract

The invention relates to a heat dissipation system based on a hydraulic mechanical transmission of a heavy-duty vehicle, belongs to the technical field of heat dissipation systems of heavy-duty vehicles, solves the technical problem of low heat dissipation efficiency of the heavy-duty vehicles, and comprises a whole vehicle radiator, a torque converter radiator, an electronic fan, a water tank, a water pump, a thermostat, an oil cooler, a one-way valve, a bypass valve and a controller. The controller is used for controlling the thermostat, the bypass valve and the electronic fan to work. The electronic fan is installed on the whole vehicle radiator and the torque converter radiator and used for accelerated heat dissipation of the whole vehicle radiator and the torque converter radiator. The working process of the heat dissipation system comprises water way heat dissipation, torque converter oil way heat dissipation and rear retarder oil way heat dissipation. The heat dissipation system is used for heat dissipation of a hydraulic mechanical transmission, an engine and a rear retarder of a heavy-duty vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation systems for heavy-loaded vehicles, and in particular relates to a heat dissipation system based on a hydromechanical transmission of a heavy-loaded vehicle. Background Art

[0002] Heavy-loaded special vehicles, mining vehicles and other large-tonnage vehicles require a large starting torque when starting, and the torque provided by the engine alone is not enough to start such vehicles in a short time in most cases. Therefore, it is necessary to integrate a locked torque converter on the vehicle to increase the starting torque of the vehicle. The torque converter of such vehicles only works when the vehicle starts and goes uphill, and the torque converter itself only has heat dissipation requirements when working. However, most of the current domestic vehicle cooling systems directly connect the heat dissipation of the torque converter with the heat dissipation of the whole vehicle in series. As long as the vehicle's cooling system is working, the torque converter will continue to cool. This cooling system wastes the vehicle's heat dissipation efficiency to a certain extent and increases power loss.

[0003] Large-tonnage and heavy-loaded vehicles also need to be equipped with a rear retarder for auxiliary braking to ensure the safety of vehicle driving. Summary of the invention

[0004] In order to overcome the disadvantage of low heat dissipation efficiency of heavy-loaded vehicles, the present invention proposes a heat dissipation system based on a hydromechanical transmission of a heavy-loaded vehicle.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A heat dissipation system based on a heavy-duty vehicle hydromechanical transmission is used for heat dissipation of the hydromechanical transmission, engine, and rear retarder of the heavy-duty vehicle, and includes a vehicle radiator, a torque converter radiator, an electronic fan, a water tank, a water pump, a thermostat, an oil cooler, a one-way valve, a bypass valve, and a controller.

[0007] The hydromechanical transmission comprises a torque converter and a mechanical transmission. The engine, the torque converter, the mechanical transmission and the rear retarder are connected in sequence.

[0008] The controller is used to control the operation of the electronic fan. The electronic fan is installed on the vehicle radiator and the torque converter radiator to accelerate the heat dissipation of the vehicle radiator and the torque converter radiator.

[0009] The working process of the cooling system includes water cooling, torque converter air cooling, rear retarder water cooling plus electronic fan accelerated cooling.

[0010] The working process of water cooling is:

[0011] When the water pump is working, the coolant in the water tank flows through the water pump, engine, oil cooler and enters the thermostat in sequence; the coolant flowing out of the thermostat either flows through the vehicle radiator to dissipate heat and returns to the water tank, or directly returns to the water tank.

[0012] The working process of torque converter air cooling is as follows:

[0013] The oil flowing out of the torque converter either flows through the torque converter oil cooler (5) and then flows back to the torque converter through the one-way valve after being cooled by the electronic fan. Alternatively, the oil flows back to the torque converter directly through the bypass valve.

[0014] The working process of heat dissipation of the rear retarder oil circuit is as follows:

[0015] The coolant flowing out of the rear retarder flows back to the rear retarder through the oil cooler.

[0016] In the above cooling system, the controller controls the electronic fan installed on the vehicle radiator to work. When the retarder is working, under the control of the controller, the coolant enters the vehicle radiator through the thermostat, and the electronic fan installed on the vehicle radiator works to speed up the heat dissipation of the vehicle radiator. When the retarder is not working, under the control of the controller, the electronic fan installed on the vehicle radiator does not work.

[0017] In the above cooling system, the controller controls the electronic fan installed on the torque converter radiator to work. When the oil temperature in the torque converter reaches or exceeds the set threshold, the electronic fan installed on the torque converter radiator works under the control of the controller to speed up the heat dissipation of the torque converter radiator. When the oil temperature in the torque converter is lower than the set threshold, the electronic fan installed on the torque converter radiator does not work under the control of the controller.

[0018] The above heat dissipation system, the water channel heat dissipation working process further includes:

[0019] When the coolant temperature in the water circuit heat dissipation reaches or exceeds the temperature threshold of the thermostat, the coolant flowing out of the thermostat flows through the vehicle radiator for heat dissipation and returns to the water tank; when the coolant temperature is lower than the temperature threshold of the thermostat, the coolant flowing out of the thermostat directly returns to the water tank.

[0020] In the above-mentioned heat dissipation system, the water circuit heat dissipation is a combination of coolant cooling and electronic fan cooling. When the coolant flowing out of the thermostat flows through the vehicle radiator for heat dissipation, the electronic fan installed on the vehicle radiator works under the control of the controller to accelerate the heat dissipation of the vehicle radiator.

[0021] The above heat dissipation system, the heat dissipation working process of the torque converter oil circuit further includes:

[0022] When the pressure in the torque converter radiator is lower than the threshold, the bypass valve is closed, and the coolant flowing out of the torque converter flows through the torque converter radiator for heat dissipation, and then flows back to the torque converter through the one-way valve. When the pressure in the torque converter radiator reaches or exceeds the threshold, the bypass valve is opened, and the coolant flowing out of the torque converter flows directly back to the torque converter.

[0023] In the above heat dissipation system, the heat dissipation of the torque converter oil circuit is an electronic fan cooling method. When the coolant temperature in the torque converter reaches or exceeds the bypass valve temperature threshold, the electronic fan installed on the torque converter radiator starts to work under the control of the controller, and the working speed of the electronic fan is adjusted according to the oil temperature in the torque converter. When the oil temperature in the torque converter is lower than the bypass valve temperature threshold, the electronic fan installed on the torque converter radiator does not work under the control of the controller.

[0024] In the above-mentioned cooling system, the water circuit is used for heat dissipation, and the coolant flowing through the engine is water. The torque converter oil circuit is used for heat dissipation, which is the so-called air cooling and oil heat exchange. The retarder is used for heat exchange between oil and cooling water, and the electronic fan accelerates the cooling of the cooling water.

[0025] In the above heat dissipation system, the oil cooler is used for heat dissipation of the rear retarder, and an oil circuit and a water circuit that are not connected are provided. The coolant of the oil circuit of the oil cooler is oil, which flows into the oil cooler from the rear retarder and flows back to the rear retarder. The coolant of the water circuit of the oil cooler is water, which flows into the oil cooler through the engine and flows out to the thermostat.

[0026] The beneficial effects of the present invention are:

[0027] A heat dissipation system based on a hydromechanical transmission of a heavy-duty vehicle, wherein the heat dissipation of the torque converter is separated from the heat dissipation of the entire vehicle, and the heat dissipation power is adjusted according to the oil temperature to save energy.

[0028] A heat dissipation system based on a heavy-duty vehicle hydromechanical transmission has a wide range of cooling power adjustment and high precision.

[0029] A heat dissipation system based on a heavy-duty vehicle hydromechanical transmission, wherein a bypass valve can prevent abnormal pressure increase caused by reasons such as blockage of a circulation loop, and the circuit is safe and reliable.

[0030] When the rear retarder is working, the electronic fan accelerates cooling, with high heat dissipation reliability and obvious cooling effect, which greatly improves the safety of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the heat dissipation system of the second embodiment of the present invention.

[0032] Figure numerals: 1. hydromechanical transmission, 2. engine, 3. rear retarder, 4. vehicle radiator, 5. torque converter radiator, 6. electronic fan, 7. water tank, 8. water pump, 9. thermostat, 10. oil cooler, 11. torque converter, 12. mechanical transmission, 13. one-way valve, 14. bypass valve. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Embodiment 1

[0035] The function of the heat dissipation circulation system of the present invention is mainly realized by a cooling water (liquid) and electronic fan cooling combination.

[0036] When the vehicle's engine is started, the water pump starts working, pumping cooling water (liquid) from the water tank into the engine to cool the engine directly; then the cooling water (liquid) reaches the oil cooler through the pipeline under the action of the water pump pressure, and the retarder oil is cooled in the oil cooler; the cooling water (liquid) passes through the oil cooler and reaches the thermostat, and the thermostat chooses to open different pipelines according to the temperature of the cooling water (liquid) at this time: if the cooling water (liquid) does not reach the set temperature at this time, the thermostat will open the vehicle radiator bypass pipeline, and the cooling water (liquid) will not pass through the vehicle radiator directly to the next cycle, and this cycle is also called a small cycle; if the retarder is working at this time, and the cooling water (liquid) temperature has reached the set value, the thermostat will open the vehicle radiator pipeline, and the controller will control the opening of the electronic fan according to the operation of the retarder. The cooling water (liquid) is cooled through the vehicle radiator before circulating, and this cycle is also called a large cycle.

[0037] When the vehicle starts or goes uphill, the torque converter starts to work. The temperature sensor on the torque converter can monitor the temperature rise of the torque converter in real time. When the set temperature is reached, the controller (TCU) controls the electronic fan to start working and adjust the cooling power. The torque converter and the radiator are connected through the torque converter oil outlet pipeline, and the radiator and the oil pan are connected through the torque converter oil return pipeline. A bypass valve is connected between the torque converter oil outlet pipeline and the torque converter oil return pipeline, and a check valve is connected to the torque converter oil return pipeline. The oil in the torque converter enters the radiator through the torque converter oil outlet pipeline, and the radiator cools the oil and returns it to the oil pan through the torque converter oil return pipeline. When the oil pressure in the radiator increases abnormally, the bypass valve opens, allowing the oil to return directly to the oil pan through the torque converter oil return pipeline.

[0038] Embodiment 2

[0039] The heat dissipation circulation system is composed of the engine, torque converter, mechanical transmission, rear retarder, vehicle radiator, torque converter radiator, electronic fan, water tank, water pump, thermostat, oil cooler, water pipe, oil pipe and other parts. Figure 1 shown.

[0040] The water circuit circulation: after the engine is started, it drives the water pump to work, and the water pump draws out the cooling water (liquid) in the water tank. The water pump pumps the cooling water (liquid) from the water outlet into the engine for cooling. The water pipe is connected in series to the oil cooler. The water (liquid) coming out of the oil cooler enters different pipes through the thermostat according to the cooling water (liquid) temperature. When the temperature is not high, it continues to circulate directly through the pipe beside the vehicle radiator (this cycle is also called the small cycle). If the temperature is too high, the thermostat opens, and the controller controls the opening of the electronic fan according to the operation of the retarder. The water (liquid) circuit passing through the thermostat is cooled through the radiator of the vehicle and then circulated in sequence (this cycle is also called the large cycle).

[0041] Torque converter oil circuit and heat dissipation cooling: one end of the oil outlet pipe is connected to the torque converter, and the other end is connected to the torque converter radiator. A bypass valve is connected to the middle of the oil outlet pipe. When the pressure in the radiator increases, or there is an unexpected blockage on the torque converter oil outlet pipe, oil return pipe and radiator circuit, resulting in a sudden pressure increase, the bypass valve opens, and the torque converter oil outlet circuit is directly connected to the torque converter oil return circuit, so that the oil flows directly back to the oil pan; one end of the return pipe is connected to the radiator, and the other end is connected to the torque converter assembly. A one-way valve is connected to the return pipe to adjust the pressure and flow entering the radiator, so that the oil and the radiator (electronic fan cooling) have sufficient heat exchange, thereby cooling; the pressure of the one-way valve is much smaller than the bypass valve opening pressure, and will not cause the bypass valve to open by mistake; the oil outlet of the torque converter is connected to a temperature sensor and a controller (TCU), which can monitor the temperature of the torque converter oil outlet in real time. If the temperature exceeds the set temperature, the controller (TCU) adjusts the speed and cooling power of the electronic fan according to the temperature range. The heat dissipation power of the torque converter radiator can be accurately adjusted.

[0042] When the torque converter is not working, that is, locked, the required heat dissipation is very small, the temperature is not high, and the electronic fan stops working.

Claims

1. A heat dissipation system based on a heavy-duty vehicle hydromechanical transmission, characterized in that: Used for heat dissipation of a hydromechanical transmission (1), an engine (2), and a rear retarder (3) of a heavy-duty vehicle, comprising a vehicle radiator (4), a torque converter radiator (5), an electronic fan (6), a water tank (7), a water pump (8), a thermostat (9), an oil cooler (10), a check valve (13), a bypass valve (14), and a controller; The hydromechanical transmission (1) comprises a torque converter (11) and a mechanical transmission (12); the engine (2), the torque converter (11), the mechanical transmission (12) and the rear retarder (3) are connected in sequence; The controller is used to control the operation of the electronic fan (6); the electronic fan (6) is installed on the vehicle radiator (4) and the torque converter radiator (5) and is used to accelerate the heat dissipation of the vehicle radiator (4) and the torque converter radiator (5); The working process of the heat dissipation system includes water cooling, air cooling of the torque converter (11), and accelerated heat dissipation of the rear retarder (3); The working process of water channel heat dissipation is: The water pump (8) works, and the coolant in the water tank (7) flows through the water pump (8), the engine (2), the oil cooler (10) in sequence, and enters the thermostat (9); the coolant flowing out of the thermostat (9) either flows through the vehicle radiator (4) to dissipate heat and returns to the water tank (7), or directly returns to the water tank (7); The heat dissipation process of the torque converter (11) is as follows: The oil flowing out of the torque converter (11) either flows through the torque converter oil cooler (5) and is cooled by the electronic fan 6, then flows back to the torque converter (11) through the one-way valve; or flows directly back to the torque converter (11) through the bypass valve (14); The heat dissipation process of the rear retarder (3) is as follows: The oil flowing out of the rear retarder (3) flows back to the rear retarder (3) through the oil cooler (10), and at this time, the electronic fan (6) on the vehicle radiator (4) works to accelerate the cooling of the oil.

2. The heat dissipation system according to claim 1, characterized in that: The controller controls the electronic fan (6) installed on the vehicle radiator (4) to work; when the rear retarder (3) is working and the coolant flows through the vehicle radiator (4), the electronic fan (6) installed on the vehicle radiator (4) works under the control of the controller to accelerate the heat dissipation of the vehicle radiator (4); when the rear retarder (3) is not working, the electronic fan (6) installed on the vehicle radiator (4) does not work under the control of the controller.

3. The heat dissipation system according to claim 1, characterized in that: The controller controls the electronic fan (6) installed on the torque converter radiator (5) to work; when the oil temperature in the torque converter (11) reaches or exceeds a set threshold value, the electronic fan (6) installed on the torque converter radiator (5) works under the control of the controller to accelerate the heat dissipation of the torque converter radiator (5); when the oil temperature in the torque converter (11) is lower than the set threshold value, the electronic fan (6) installed on the torque converter radiator (5) does not work under the control of the controller.

4. The heat dissipation system according to claim 1, characterized in that: The water circuit heat dissipation working process further includes: when the temperature of the coolant in the water circuit heat dissipation reaches or exceeds the set temperature of the thermostat (9), the coolant flowing out of the thermostat (9) flows through the vehicle radiator (4) to dissipate heat and returns to the water tank (7); when the coolant temperature is lower than the set temperature of the thermostat (9), the coolant flowing out of the thermostat (9) directly returns to the water tank (7).

5. The heat dissipation system according to claim 4, characterized in that: The water circuit heat dissipation is a combination of coolant cooling and electronic fan accelerated cooling. When the rear retarder (3) is working, the coolant flowing out of the thermostat (9) flows through the vehicle radiator (4) to dissipate heat. Under the control of the controller, the electronic fan (6) installed on the vehicle radiator (4) works to accelerate the heat dissipation of the vehicle radiator (4).

6. The heat dissipation system according to claim 1, characterized in that: The torque converter (11) oil circuit heat dissipation working process further includes: When the pressure in the torque converter radiator (5) is lower than the set pressure, the bypass valve (14) is closed, and the oil flowing out of the torque converter (11) flows through the torque converter radiator (5) to dissipate heat, and then flows back to the torque converter (11) through the one-way valve (13); when the pressure in the torque converter radiator (5) reaches or exceeds the set pressure, the bypass valve (14) is opened under the control of the controller, and the coolant flowing out of the torque converter (11) directly flows back to the torque converter (11).

7. The heat dissipation system according to claim 6, characterized in that: The oil circuit heat dissipation of the torque converter (11) is a combination of oil cooling and electronic fan cooling. When the temperature of the coolant in the torque converter (11) reaches or exceeds the set temperature of the bypass valve (14), the electronic fan (6) installed on the torque converter radiator (5) starts to work under the control of the controller, and the working speed of the electronic fan (6) is adjusted according to the coolant temperature in the torque converter (11); when the temperature of the coolant in the torque converter (11) is lower than the set temperature of the bypass valve (14), the electronic fan (6) installed on the torque converter radiator (5) does not work under the control of the controller.

8. The heat dissipation system according to claim 1, characterized in that: The water circuit dissipates heat, and the coolant flowing through the engine (2) is water; the torque converter (11) dissipates heat by air cooling; the rear retarder (3) also dissipates heat by water cooling, and the coolant flowing through the rear retarder (3) is oil.

9. The heat dissipation system according to claim 1, characterized in that: The oil cooler (10) is used for heat dissipation of the rear retarder (3), and is provided with an oil circuit and a water circuit which are not connected to each other; the coolant of the oil circuit of the oil cooler (10) is oil, which flows in from the rear retarder (3) and flows back to the rear retarder (3); the coolant of the water circuit of the oil cooler (10) is water, which flows in through the engine (2) and flows out to the thermostat (9).

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