Thermal management system, control method and device for hybrid excavator

Abstract

The invention discloses a heat management system, a control method and a device for a hybrid excavator, belongs to the technical field of heat management of hybrid excavators, and aims to solve the problems that in the prior art, a hydraulic motor fan, a low-voltage electronic fan or an air-cooled high-voltage electronic fan is generally adopted, energy consumption is high, design is difficult, and in a high-temperature environment, heat dissipation is poor. And a fan speed reduction protection mechanism can be triggered, so that the heat dissipation efficiency of the radiator is reduced. The system comprises a VCU module and a plurality of heat management modules, and the heat management modules comprise an engine heat management module, an ISG motor electric control heat management module, a rotary motor electric control heat management module, a fan heat management module and a hydraulic system heat management module. The liquid cooling high-pressure fan is adopted, oil consumption of the engine can be reduced, energy recycled by the ISG motor and the rotary motor can be more effectively utilized, the high-pressure electronic fan adopts a liquid cooling heat dissipation mode, the rotating speed of the fan cannot be reduced due to high temperature in a high-temperature environment, and the reliability of a heat management system is improved.

Description

Technical Field

[0001] The present invention relates to a hybrid excavator thermal management system, a control method and a device, and belongs to the technical field of hybrid excavator thermal management. Background Art

[0002] An excavator is a multi-purpose construction machinery. Hybrid excavators add ISG motors and power batteries to traditional excavators, or replace hydraulic swing motors with swing motors. ISG motors are connected in series to the flywheel end of the engine to dynamically adjust the output torque of the engine, or provide power for starting the engine, and can provide electricity for the swing motor and power battery. Compared with traditional excavators, hybrid excavators need to add motors and power battery cooling systems.

[0003] In the prior art, a hydraulic motor is usually used to drive a fan to force air cooling of the radiator core. This solution requires a heat pump to deliver high-pressure hydraulic oil to a hydraulic motor to drive the fan. This has the disadvantages of low energy conversion rate and high energy consumption of the hydraulic system, and requires the layout of complex hydraulic pipelines. The second solution uses a low-voltage electronic fan to force air cooling of the radiator core. This solution uses an ISG motor to send high-voltage electricity to an all-in-one controller, which is then distributed to the DCDC by the all-in-one controller, and then the DCDC provides power to the low-voltage fan. This solution usually requires a large number of low-voltage electronic fans to meet the heat dissipation requirements of the entire machine. Not only the electrical system The system design is difficult, and there are disadvantages such as excessive fan starting current and high energy consumption. The third solution uses an air-cooled high-pressure fan to force air cooling of the radiator core. In this solution, the ISG motor sends high voltage electricity to the all-in-one controller, and then the all-in-one controller provides power to the fan. Since the heat dissipation air outlet temperature of the engine radiator and the intercooler radiator is relatively high, usually exceeding 75°C, it becomes difficult to dissipate heat inside the fan. The high-pressure fan will trigger the fan speed reduction protection mechanism when it is in a high-temperature environment for a long time, resulting in a decrease in the heat dissipation efficiency of the radiator and an increase in the ambient temperature of the fan, which leads to a vicious cycle of further fan speed reduction.

[0004] As can be seen from the above, the thermal management of hybrid excavators in the prior art usually adopts hydraulic motor fans, low-voltage electronic fans or air-cooled high-voltage electronic fans, which have high energy consumption and difficult design. In addition, in high temperature environments, the fan speed reduction protection mechanism will be triggered, resulting in a decrease in the heat dissipation efficiency of the radiator, affecting the stability of the thermal management work of the hybrid excavator. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a hybrid excavator thermal management system, control method and device, which adopts a liquid-cooled high-pressure fan. Compared with the hydraulic motor fan, low-voltage electronic fan and air-cooled high-pressure electronic fan in the prior art, the use of a liquid-cooled high-pressure electronic fan can not only reduce the fuel consumption of the engine, but also more effectively utilize the energy recovered by the ISG motor and the rotary motor. Since the high-voltage electronic fan adopts a liquid-cooled heat dissipation method, the fan will not reduce its speed due to high temperature in a high temperature environment, thereby improving the reliability of the thermal management system and reducing the failure rate of the entire machine.

[0006] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a hybrid excavator thermal management system, including a VCU module and a plurality of thermal management modules, wherein the plurality of thermal management modules include an engine thermal management module, an ISG motor electronic control thermal management module, a swing motor electronic control thermal management module, a fan thermal management module and a hydraulic system thermal management module; The engine thermal management module, the ISG motor electronic control thermal management module, the rotary motor electronic control thermal management module, the fan thermal management module and the hydraulic system thermal management module all include a liquid-cooled high-pressure fan, and a plurality of the liquid-cooled high-pressure fans are electrically connected to the VCU module; The fan thermal management module also includes a high-pressure fan radiator, a water pump and a flow distributor. One end of each of the liquid-cooled high-pressure fans is connected to the flow distributor, and the other ends of each of the liquid-cooled high-pressure fans are connected to the high-pressure fan radiator. The high-pressure fan radiator is connected to the flow distributor through the water pump, and the flow distributor and the water pump are both electrically connected to the VCU module.

[0007] Furthermore, the engine thermal management module also includes a high-temperature radiator, an engine and an intercooler radiator. The engine includes a mechanical water pump and a turbocharger. The mechanical water pump is used to drive the coolant in the engine to flow through the high-temperature radiator. The turbocharger is used to drive the high-temperature air in the engine to flow through the intercooler radiator. The liquid-cooled high-pressure fan in the engine thermal management module is used to force air cooling on the high-temperature radiator and the intercooler radiator.

[0008] Further, the ISG motor electronically controlled thermal management module and the rotary motor electronically controlled thermal management module both include a water pump, and a plurality of the water pumps are electrically connected to the VCU module; The ISG motor electronic control thermal management module also includes an ISG motor, an ISG motor electronic control radiator, and an ISG motor controller. The water pump in the ISG motor electronic control thermal management module is used to drive the coolant to transfer the heat of the ISG motor and the ISG motor controller to the ISG motor electronic control radiator. The liquid-cooled high-pressure fan in the ISG motor electronic control thermal management module is used to force air cooling on the ISG motor electronic control radiator. The rotary motor electronic control thermal management module further comprises a rotary motor electronic control radiator, a rotary motor and a rotary motor controller. The water pump in the rotary motor electronic control thermal management module is used to drive the coolant to transfer the heat of the rotary motor and the rotary motor controller to the rotary motor electronic control radiator. The liquid-cooled high-pressure fan in the rotary motor electronic control thermal management module is used to force air cooling on the rotary motor electronic control radiator. The hydraulic system thermal management module further comprises a hydraulic oil radiator, and the liquid-cooled high-pressure fan in the hydraulic system thermal management module is used for forced air cooling of the hydraulic oil radiator; The liquid-cooled high-pressure fan includes a fan module and a control module. The control module is electrically connected to the VCU module. The control module is used to monitor the fan blower coil temperature and the IGBT module temperature.

[0009] In a second aspect, the present invention provides a control method for a hybrid excavator thermal management system, based on the hybrid excavator thermal management system described in the first aspect, including liquid cooling high-pressure fan speed control; The liquid-cooled high-pressure fan speed control includes the liquid-cooled high-pressure fan speed control of the ISG motor electronic control thermal management module and the high-temperature radiator; The ISG motor electronic control thermal management module and the liquid cooling high pressure fan speed control of the high temperature radiator specifically include: The VCU module obtains the engine coolant temperature, the ISG motor water inlet temperature and the ISG motor controller water inlet temperature, queries the corresponding MAP map according to the engine coolant temperature to obtain the required fan duty cycle signal Duty_EW, queries the corresponding MAP map according to the ISG motor water inlet temperature and the ISG motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_ISG1, takes the larger of Duty_EW and Duty_ISG1 to obtain F_DutyDes_A, and limits F_DutyDes_A between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit F_DutyDes_B, and limits F_DutyDes_B between 0 and 100 through the first algorithm; F_Duty1Des is obtained by taking the smaller of F_DutyDes_A and F_DutyDes_B as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the ISG motor electronic control thermal management module and the high-temperature radiator.

[0010] Further, the liquid-cooled high-pressure fan speed control also includes liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator; The liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator specifically includes: The VCU module obtains the engine intake temperature, the rotary motor water inlet temperature and the rotary motor controller water inlet temperature, queries the corresponding MAP map according to the engine intake temperature to obtain the required fan duty cycle signal Duty_EC, queries the corresponding MAP map according to the rotary motor water inlet temperature and the rotary motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_Slew1, takes the greater of Duty_EC and Duty_Slew1 to obtain F_DutyDes_C, and limits F_DutyDes_C between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit value F_DutyDes_D, and limits F_DutyDes_D between 0 and 100 through the first algorithm; Finally, F_DutyDes_C and F_DutyDes_D are minimized to obtain F_Duty2Des, which is used as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the rotary motor electronically controlled radiator and the intercooler radiator.

[0011] Further, the liquid-cooled high-pressure fan speed control also includes liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module; The liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module specifically includes: The VCU module obtains the oil inlet temperature of the hydraulic oil radiator, queries the corresponding MAP diagram to obtain the required fan duty cycle signal F_DutyDes_E, and limits F_DutyDes_E between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit values ​​Duty_FMW3 and Duty_IGBT3, takes the smaller value of Duty_FMW3 and Duty_IGBT3 to obtain F_DutyDes_F, and limits F_DutyDes_F between 0 and 100 through the first algorithm; Finally, F_Duty3Des is obtained by taking the smaller value of F_DutyDes_E and F_DutyDes_F as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the fan thermal management module and the hydraulic system thermal management module.

[0012] Furthermore, it also includes water pump speed control and flow distributor flow control, wherein the water pump speed control specifically includes water pump speed control of the ISG motor electronic control thermal management module and water pump speed control of the rotary motor electronic control thermal management module: The water pump speed control of the ISG motor electronic control thermal management module includes: the VCU module obtains the ISG motor water inlet temperature and the ISG motor controller water inlet temperature, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_ISG2 and Duty_ISG_MCU, takes the larger of Duty_ISG2 and Duty_ISG_MCU to obtain P_Duty1Des, limits P_Duty1Des between 0 and 100 through the first algorithm, and the limited P_Duty1Des is the speed duty cycle control signal of the water pump of the ISG motor electronic control thermal management module, which controls the water pump speed of the ISG motor electronic control thermal management module; The water pump speed control of the rotary motor electronic control thermal management module includes: the VCU module obtains the rotary motor water inlet temperature and the rotary motor controller water inlet temperature, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_Slew2 and Duty_Slew_MCU, takes the larger of Duty_Slew2 and Duty_Slew_MCU to obtain P_Duty2Des, limits P_Duty2Des between 0 and 100 through the first algorithm, and the limited P_Duty2Des is the speed duty cycle control signal of the water pump of the rotary motor electronic control thermal management module, which controls the water pump speed of the rotary motor electronic control thermal management module.

[0013] Furthermore, the water pump speed control also includes the water pump speed control of the fan thermal management module: The water pump speed control of the fan thermal management module includes: the control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, obtains the Mass Flow by summing the required flow requirements of each fan, queries the corresponding MAP diagram according to the Mass Flow to obtain the required water pump duty cycle signal P_Duty3Des, limits P_Duty3Des between 0 and 100 through a first algorithm, and the limited P_Duty3Des is the water pump speed duty cycle control signal of the high-voltage fan thermal management module, which controls the water pump speed of the fan thermal management module.

[0014] Furthermore, the flow distributor flow control specifically includes: The control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, sends the required flow requirement of each fan to the VCU module, calculates the current value of each solenoid valve at the outlet of the flow distributor through the second algorithm, and controls the flow of the flow distributor.

[0015] In a third aspect, the present invention provides a thermal management device for a hybrid excavator, comprising a shell, in which a high-temperature radiator, an intercooler radiator, a hydraulic oil radiator, an ISG motor electronic control radiator, a rotary motor electronic control radiator and a high-pressure fan radiator are arranged, the high-temperature radiator, the intercooler radiator and the hydraulic oil radiator are installed in parallel, the ISG motor electronic control radiator is located in front of the high-temperature radiator, the rotary motor electronic control radiator is located in front of the intercooler radiator, and the high-pressure fan radiator is located in front of the hydraulic oil radiator.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Since the engine heat dissipation of the hybrid excavator is large and the heat dissipation environment is poor, the present invention adopts a liquid-cooled high-pressure fan. Compared with the hydraulic motor fan, low-voltage electronic fan and air-cooled high-pressure electronic fan in the prior art, the use of a liquid-cooled high-pressure electronic fan can not only reduce the fuel consumption of the engine, but also more effectively utilize the energy recovered by the ISG motor and the rotary motor. Since the high-pressure electronic fan adopts a liquid-cooled heat dissipation method, the fan will not reduce the speed due to high temperature in a high-temperature environment, thereby improving the reliability of the thermal management system and reducing the failure rate of the whole machine; 2. The present invention provides a control method for a hybrid excavator thermal management system, which controls the fan speed based on the coolant temperature of each thermal management module, and sets the upper limit of the fan speed based on the fan blower coil temperature and the fan controller IGBT temperature to avoid damage to the fan due to high temperature inside, thereby ensuring the stability of the liquid-cooled high-pressure fan during operation; the electronic water pump flow of the ISG motor electronic control thermal management module and the rotary motor electronic control thermal management module of the present invention adopts a temperature-based control method to regulate the temperature of each thermal management module; the electronic water pump flow required for heat dissipation of each liquid-cooled high-voltage electronic fan is determined based on the blower coil temperature and the fan controller IGBT module temperature, and the flow distributor performs flow control based on the fan temperature, thereby improving the flow distribution accuracy and the stability of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a system schematic diagram of a hybrid excavator thermal management system provided according to an embodiment of the present invention; Figure 2is a schematic diagram of the three-dimensional structure of a liquid-cooled high-pressure fan provided according to an embodiment of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of a hybrid excavator thermal management device provided according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a hybrid excavator thermal management device provided according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the liquid-cooled high-pressure fan speed control of the ISG motor electronic control thermal management module and the high-temperature radiator according to an embodiment of the present invention; Figure 6 It is a schematic diagram of liquid-cooled high-pressure fan speed control of a rotary motor electronically controlled radiator and an intercooler radiator provided in an embodiment of the present invention; Figure 7 is a schematic diagram of liquid-cooled high-pressure fan speed control of a fan thermal management module and a hydraulic system thermal management module provided in an embodiment of the present invention; Figure 8 is a schematic diagram of water pump speed control of an ISG motor electronic control thermal management module provided according to an embodiment of the present invention; Fig. 9 is a schematic diagram of water pump speed control of a rotary motor electronically controlled thermal management module according to an embodiment of the present invention; Fig.10 is a schematic diagram of water pump speed control of a fan thermal management module provided in an embodiment of the present invention; Fig.11 It is a flow control schematic diagram of a flow distributor provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Embodiment 1:

[0021] like Figure 1 As shown, the present invention provides a hybrid excavator thermal management system, including a VCU module and multiple thermal management modules, the multiple thermal management modules include an engine thermal management module, an ISG motor electronic control thermal management module, a swing motor electronic control thermal management module, a fan thermal management module and a hydraulic system thermal management module; the engine thermal management module, the ISG motor electronic control thermal management module, the swing motor electronic control thermal management module, the fan thermal management module and the hydraulic system thermal management module all include a liquid-cooled high-pressure fan, and multiple liquid-cooled high-pressure fans are electrically connected to the VCU module; the fan thermal management module also includes a high-pressure fan radiator, a water pump and a flow distributor, one end of multiple liquid-cooled high-pressure fans are connected to the flow distributor, the other end of multiple liquid-cooled high-pressure fans are connected to the high-pressure fan radiator, the high-pressure fan radiator is connected to the flow distributor through the water pump, and the flow distributor and the water pump are electrically connected to the VCU module.

[0022] Specifically, the electronic water pump drives the coolant flow, and the flow distributor adjusts the coolant flow of the high-voltage electronic fans of each thermal management module, thereby accurately controlling the temperature of the fan module and control module of each liquid-cooled high-voltage fan to avoid thermal imbalance problems caused by high-temperature speed reduction of the high-voltage fan. The VCU module collects the coolant temperature of each thermal management module through the CAN bus to adjust the speed of the liquid-cooled high-voltage fan and the electronic water pump and the opening of the flow distributor, thereby controlling the coolant temperature of each thermal management module and sending fault information of each module to the instrument.

[0023] Due to the large heat dissipation of the engine of the hybrid excavator and the poor heat dissipation environment, the present invention adopts a liquid-cooled high-pressure fan. Compared with the hydraulic motor fan, low-voltage electronic fan and air-cooled high-pressure electronic fan in the prior art, the use of a liquid-cooled high-pressure electronic fan can not only reduce the fuel consumption of the engine, but also more effectively utilize the energy recovered by the ISG motor and the rotary motor. Since the high-voltage electronic fan adopts a liquid-cooled heat dissipation method, the fan will not reduce its speed due to high temperature in a high temperature environment, thereby improving the reliability of the thermal management system and reducing the failure rate of the entire machine.

[0024] In one embodiment, the engine thermal management module also includes a high-temperature radiator, an engine and an intercooler radiator, the engine includes a mechanical water pump and a turbocharger, the mechanical water pump is used to drive the coolant in the engine to flow through the high-temperature radiator, the turbocharger is used to drive the high-temperature air in the engine to flow through the intercooler radiator, and the liquid-cooled high-pressure fan in the engine thermal management module is used to force air cooling to the high-temperature radiator and the intercooler radiator.

[0025] Specifically, the high-temperature coolant inside the engine is driven by a mechanical water pump to flow through the high-temperature radiator, and then the temperature is adjusted by forced air cooling by a liquid-cooled high-pressure electronic fan. The high-temperature air after being pressurized by the turbocharger flows through the intercooler radiator, and then is cooled by forced air cooling by a liquid-cooled high-pressure electronic fan.

[0026] In one embodiment, the ISG motor electronic control thermal management module and the rotary motor electronic control thermal management module both include water pumps, and a plurality of the water pumps are electrically connected to the VCU module; the ISG motor electronic control thermal management module also includes an ISG motor (integrated starter generator), an ISG motor electronic control radiator, and an ISG motor controller; the water pump in the ISG motor electronic control thermal management module is used to drive the coolant to transfer the heat of the ISG motor and the ISG motor controller to the ISG motor electronic control radiator, and the liquid-cooled high-pressure fan in the ISG motor electronic control thermal management module is used to force air cooling of the ISG motor electronic control radiator; the rotary motor electronic control thermal management module also includes a rotary motor electronic control radiator, a rotary motor electronic control radiator, and a rotary motor electronic control radiator. The rotary motor and rotary motor controller, the water pump in the rotary motor electronic control thermal management module is used to drive the coolant to transfer the heat of the rotary motor and the rotary motor controller to the rotary motor electronic control radiator, and the liquid-cooled high-pressure fan in the rotary motor electronic control thermal management module is used to force air cooling of the rotary motor electronic control radiator; the hydraulic system thermal management module also includes a hydraulic oil radiator, and the liquid-cooled high-pressure fan in the hydraulic system thermal management module is used to force air cooling of the hydraulic oil radiator; the liquid-cooled high-pressure fan includes a fan module and a control module, the control module is electrically connected to the VCU module, and the control module is used to monitor the fan blower coil temperature and the IGBT module (insulated gate bipolar transistor) temperature.

[0027] Specifically, the liquid-cooled high-pressure fan consists of a fan module and a control module. The control module is fixed to the fan module with bolts. The control module receives and sends messages to the VCU module through the CAN line. It can be used to monitor the temperature of the fan stator coil and the IGBT module (insulated gate bipolar transistor), as well as control the fan speed and feedback fan failure; the hydraulic system thermal management module includes a hydraulic oil radiator and a liquid-cooled high-pressure electronic fan. The hydraulic system (that is, the remaining thermal management modules excluding the hydraulic system thermal management module) transfers excess system heat to the hydraulic oil radiator through hydraulic oil, and then the liquid-cooled high-pressure electronic fan cools the heat dissipation core by air cooling. Embodiment 2:

[0028] like Figure 5-Figure 11 As shown, the present invention discloses a control method for a hybrid excavator thermal management system, which is based on the hybrid excavator thermal management system described in Example 1, including liquid-cooled high-pressure fan speed control, water pump speed control and flow distributor flow control; the liquid-cooled high-pressure fan speed control includes liquid-cooled high-pressure fan speed control of the ISG motor electronically controlled thermal management module and the high-temperature radiator, liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator, and liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module.

[0029] Optional, Figure 5-Figure 11 ALG1 is the first algorithm.

[0030] like Figure 5 As shown in one embodiment, the speed control of the liquid-cooled high-pressure fan of the ISG motor electronically controlled thermal management module and the high-temperature radiator specifically includes: The VCU module obtains the engine coolant temperature, the ISG motor water inlet temperature and the ISG motor controller water inlet temperature through the CAN line, queries the corresponding MAP map according to the engine coolant temperature to obtain the required fan duty cycle signal Duty_EW, queries the corresponding MAP map according to the ISG motor water inlet temperature and the ISG motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_ISG1, takes the larger of Duty_EW and Duty_ISG1 to obtain F_DutyDes_A, and limits F_DutyDes_A between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit F_DutyDes_B, and limits F_DutyDes_B between 0 and 100 through the first algorithm; F_Duty1Des is obtained by taking the smaller of F_DutyDes_A and F_DutyDes_B as the speed duty cycle control signal of the liquid-cooled high-pressure fan, that is, the speed duty cycle control signal of liquid-cooled high-pressure fan 1 and liquid-cooled high-pressure fan 2, to control the speed of the liquid-cooled high-pressure fan of the ISG motor electronic thermal management module and the high-temperature radiator.

[0031] like Figure 6 As shown, in one embodiment, the liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator specifically includes: The VCU module obtains the engine intake temperature, the rotary motor water inlet temperature and the rotary motor controller water inlet temperature through the CAN line, queries the corresponding MAP map according to the engine intake temperature to obtain the required fan duty cycle signal Duty_EC, queries the corresponding MAP map according to the rotary motor water inlet temperature and the rotary motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_Slew1, takes the greater of Duty_EC and Duty_Slew1 to obtain F_DutyDes_C, and limits F_DutyDes_C between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit value F_DutyDes_D, and limits F_DutyDes_D between 0 and 100 through the first algorithm; Finally, F_DutyDes_C and F_DutyDes_D are minimized to obtain F_Duty2Des as the speed duty cycle control signal of the liquid-cooled high-pressure fan, that is, the speed duty cycle control signal of liquid-cooled high-pressure fan 3 and liquid-cooled high-pressure fan 4, to control the speed of the liquid-cooled high-pressure fan of the rotary motor electronically controlled radiator and the intercooler radiator.

[0032] like Figure 7 As shown, in one embodiment, the liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module specifically includes: The VCU module obtains the oil inlet temperature of the hydraulic oil radiator through the CAN line, queries the corresponding MAP diagram to obtain the required fan duty cycle signal F_DutyDes_E, and limits F_DutyDes_E between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit values ​​Duty_FMW3 and Duty_IGBT3, takes the smaller value of Duty_FMW3 and Duty_IGBT3 to obtain F_DutyDes_F, and limits F_DutyDes_F between 0 and 100 through the first algorithm; Finally, F_DutyDes_E and F_DutyDes_F are taken as the smaller one to obtain F_Duty3Des as the speed duty cycle control signal of the liquid-cooled high-pressure fan, that is, the speed duty cycle control signal of liquid-cooled high-pressure fan 5, liquid-cooled high-pressure fan 6, liquid-cooled high-pressure fan 7 and liquid-cooled high-pressure fan 8, to control the speed of the liquid-cooled high-pressure fan of the fan thermal management module and the hydraulic system thermal management module.

[0033] In one embodiment, the water pump speed control specifically includes: like Figure 8 As shown, the water pump speed control of the ISG motor electronic control thermal management module includes: the VCU module obtains the ISG motor water inlet temperature and the ISG motor controller water inlet temperature through the CAN line, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_ISG2 and Duty_ISG_MCU, takes the larger of Duty_ISG2 and Duty_ISG_MCU to obtain P_Duty1Des, limits P_Duty1Des between 0 and 100 through the first algorithm, and the limited P_Duty1Des is the speed duty cycle control signal of the water pump of the ISG motor electronic control thermal management module, which controls the water pump speed of the ISG motor electronic control thermal management module; like Fig. 9As shown, the water pump speed control of the rotary motor electronic control thermal management module includes: the VCU module obtains the rotary motor inlet water temperature and the rotary motor controller inlet water temperature through the CAN line, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_Slew2 and Duty_Slew_MCU, takes the larger of Duty_Slew2 and Duty_Slew_MCU to obtain P_Duty2Des, limits P_Duty2Des between 0 and 100 through the first algorithm, and the limited P_Duty2Des is the speed duty cycle control signal of the water pump of the rotary motor electronic control thermal management module, which controls the water pump speed of the rotary motor electronic control thermal management module; like Fig.10 As shown, the water pump speed control of the fan thermal management module includes: the control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, obtains the Mass Flow by summing the required flow requirements of each fan, queries the corresponding MAP diagram according to the Mass Flow to obtain the required water pump duty cycle signal P_Duty3Des, limits P_Duty3Des between 0 and 100 through the first algorithm, and the limited P_Duty3Des is the water pump speed duty cycle control signal of the high-voltage fan thermal management module, which controls the water pump speed of the fan thermal management module.

[0034] like Fig.11 As shown, in one embodiment, the flow control of the flow distributor specifically includes: The control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, sends the required flow requirement of each fan to the VCU module, and calculates the current value of each solenoid valve at the outlet of the flow distributor through the second algorithm to control the flow of the flow distributor; optionally, ALG2 in the attached figure is the first algorithm.

[0035] The present invention controls the fan speed based on the coolant temperature of each thermal management module, and sets the upper limit of the fan speed according to the fan blower coil temperature and the fan controller IGBT temperature, so as to avoid damage due to high temperature inside the fan and ensure the stability of the liquid-cooled high-voltage fan during operation; the electronic water pump flow of the ISG motor electronic control thermal management module and the rotary motor electronic control thermal management module of the present invention adopts a temperature-controlled method to regulate the temperature of each thermal management module; the electronic water pump flow required for heat dissipation of each liquid-cooled high-voltage electronic fan is determined according to the blower coil temperature and the fan controller IGBT module temperature, and the flow distributor performs flow control based on the fan temperature, thereby improving the flow distribution accuracy and the stability of the fan operation. Embodiment three:

[0036] like Figure 2-Figure 4 As shown, the present invention provides a hybrid excavator thermal management device, including a shell, in which a high-temperature radiator, an intercooler radiator, a hydraulic oil radiator, an ISG motor electronic control radiator, a swing motor electronic control radiator and a high-pressure fan radiator are arranged, the high-temperature radiator, the intercooler radiator and the hydraulic oil radiator are installed in parallel, the ISG motor electronic control radiator is located in front of the high-temperature radiator, the swing motor electronic control radiator is located in front of the intercooler radiator, and the high-pressure fan radiator is located in front of the hydraulic oil radiator.

[0037] Specifically, the high-temperature radiator, the intercooler radiator and the hydraulic oil radiator are installed in parallel, the high-temperature radiator and the intercooler radiator share an air guide cover, and the hydraulic oil radiator uses an air guide cover alone; the ISG motor electronic control radiator is connected in series on the front side of the high-temperature radiator, and shares liquid-cooled high-pressure electronic fan 1 and liquid-cooled high-pressure electronic fan 2 with it; the rotary motor electronic control radiator is connected in series on the front side of the intercooler radiator, and shares liquid-cooled high-pressure electronic fan 3 and liquid-cooled high-pressure electronic fan 4 with it; the high-pressure fan radiator is connected in series on the front side of the hydraulic oil radiator, and shares liquid-cooled high-pressure electronic fans 5, 6, 7, and 8; optionally, the control module in the liquid-cooled high-pressure fan is installed on the fan module by bolts.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hybrid excavator thermal management system, characterized in that: It includes a VCU module and multiple thermal management modules, wherein the multiple thermal management modules include an engine thermal management module, an ISG motor electronic control thermal management module, a rotary motor electronic control thermal management module, a fan thermal management module and a hydraulic system thermal management module; The engine thermal management module, the ISG motor electronic control thermal management module, the rotary motor electronic control thermal management module, the fan thermal management module and the hydraulic system thermal management module all include a liquid-cooled high-pressure fan, and a plurality of the liquid-cooled high-pressure fans are electrically connected to the VCU module; The fan thermal management module also includes a high-pressure fan radiator, a water pump and a flow distributor. One end of each of the liquid-cooled high-pressure fans is connected to the flow distributor, and the other ends of each of the liquid-cooled high-pressure fans are connected to the high-pressure fan radiator. The high-pressure fan radiator is connected to the flow distributor through the water pump, and the flow distributor and the water pump are both electrically connected to the VCU module.

2. The hybrid excavator thermal management system according to claim 1, characterized in that: The engine thermal management module also includes a high-temperature radiator, an engine and an intercooler radiator. The engine includes a mechanical water pump and a turbocharger. The mechanical water pump is used to drive the coolant in the engine to flow through the high-temperature radiator. The turbocharger is used to drive the high-temperature air in the engine to flow through the intercooler radiator. The liquid-cooled high-pressure fan in the engine thermal management module is used to force air cooling on the high-temperature radiator and the intercooler radiator.

3. The hybrid excavator thermal management system according to claim 2, characterized in that: The ISG motor electronic control thermal management module and the rotary motor electronic control thermal management module both include a water pump, and a plurality of the water pumps are electrically connected to the VCU module; The ISG motor electronic control thermal management module also includes an ISG motor, an ISG motor electronic control radiator, and an ISG motor controller. The water pump in the ISG motor electronic control thermal management module is used to drive the coolant to transfer the heat of the ISG motor and the ISG motor controller to the ISG motor electronic control radiator. The liquid-cooled high-pressure fan in the ISG motor electronic control thermal management module is used to force air cooling on the ISG motor electronic control radiator. The rotary motor electronic control thermal management module further comprises a rotary motor electronic control radiator, a rotary motor and a rotary motor controller. The water pump in the rotary motor electronic control thermal management module is used to drive the coolant to transfer the heat of the rotary motor and the rotary motor controller to the rotary motor electronic control radiator. The liquid-cooled high-pressure fan in the rotary motor electronic control thermal management module is used to force air cooling on the rotary motor electronic control radiator. The hydraulic system thermal management module further comprises a hydraulic oil radiator, and the liquid-cooled high-pressure fan in the hydraulic system thermal management module is used for forced air cooling of the hydraulic oil radiator; The liquid-cooled high-pressure fan includes a fan module and a control module. The control module is electrically connected to the VCU module. The control module is used to monitor the fan blower coil temperature and the IGBT module temperature.

4. A control method for a hybrid excavator thermal management system, based on the hybrid excavator thermal management system according to claim 3, characterized in that: Includes liquid cooling high pressure fan speed control; The liquid-cooled high-pressure fan speed control includes the liquid-cooled high-pressure fan speed control of the ISG motor electronic control thermal management module and the high-temperature radiator, specifically including: The VCU module obtains the engine coolant temperature, the ISG motor water inlet temperature and the ISG motor controller water inlet temperature, queries the corresponding MAP map according to the engine coolant temperature to obtain the required fan duty cycle signal Duty_EW, queries the corresponding MAP map according to the ISG motor water inlet temperature and the ISG motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_ISG1, takes the larger of Duty_EW and Duty_ISG1 to obtain F_DutyDes_A, and limits F_DutyDes_A between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit F_DutyDes_B, and limits F_DutyDes_B between 0 and 100 through the first algorithm; F_Duty1Des is obtained by taking the smaller of F_DutyDes_A and F_DutyDes_B as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the ISG motor electronic control thermal management module and the high-temperature radiator.

5. The control method of the hybrid excavator thermal management system according to claim 4, characterized in that: The liquid-cooled high-pressure fan speed control also includes the liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator; The liquid-cooled high-pressure fan speed control of the rotary motor electronically controlled radiator and the intercooler radiator specifically includes: The VCU module obtains the engine intake temperature, the rotary motor water inlet temperature and the rotary motor controller water inlet temperature, queries the corresponding MAP map according to the engine intake temperature to obtain the required fan duty cycle signal Duty_EC, queries the corresponding MAP map according to the rotary motor water inlet temperature and the rotary motor controller water inlet temperature to obtain the required fan duty cycle signal Duty_Slew1, takes the greater of Duty_EC and Duty_Slew1 to obtain F_DutyDes_C, and limits F_DutyDes_C between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit value F_DutyDes_D, and limits F_DutyDes_D between 0 and 100 through the first algorithm; Finally, F_DutyDes_C and F_DutyDes_D are minimized to obtain F_Duty2Des, which is used as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the rotary motor electronically controlled radiator and the intercooler radiator.

6. The control method of the hybrid excavator thermal management system according to claim 4, characterized in that: The liquid-cooled high-pressure fan speed control also includes liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module; The liquid-cooled high-pressure fan speed control of the fan thermal management module and the hydraulic system thermal management module specifically includes: The VCU module obtains the oil inlet temperature of the hydraulic oil radiator, queries the corresponding MAP diagram to obtain the required fan duty cycle signal F_DutyDes_E, and limits F_DutyDes_E between 0 and 100 through the first algorithm; The control module collects the fan coil temperature and the IGBT module temperature, queries the corresponding thermal deceleration MAP diagram to obtain the fan duty cycle upper limit values ​​Duty_FMW3 and Duty_IGBT3, takes the smaller value of Duty_FMW3 and Duty_IGBT3 to obtain F_DutyDes_F, and limits F_DutyDes_F between 0 and 100 through the first algorithm; Finally, F_Duty3Des is obtained by taking the smaller value of F_DutyDes_E and F_DutyDes_F as the speed duty cycle control signal of the liquid-cooled high-pressure fan to control the speed of the liquid-cooled high-pressure fan of the fan thermal management module and the hydraulic system thermal management module.

7. The control method of the hybrid excavator thermal management system according to claim 4, characterized in that: It also includes water pump speed control and flow distributor flow control, wherein the water pump speed control specifically includes water pump speed control of the ISG motor electronic control thermal management module and water pump speed control of the rotary motor electronic control thermal management module: The water pump speed control of the ISG motor electronic control thermal management module includes: the VCU module obtains the ISG motor water inlet temperature and the ISG motor controller water inlet temperature, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_ISG2 and Duty_ISG_MCU, takes the larger of Duty_ISG2 and Duty_ISG_MCU to obtain P_Duty1Des, limits P_Duty1Des between 0 and 100 through the first algorithm, and the limited P_Duty1Des is the speed duty cycle control signal of the water pump of the ISG motor electronic control thermal management module, which controls the water pump speed of the ISG motor electronic control thermal management module; The water pump speed control of the rotary motor electronic control thermal management module includes: the VCU module obtains the rotary motor water inlet temperature and the rotary motor controller water inlet temperature, queries the corresponding MAP diagram to obtain the required water pump duty cycle signals Duty_Slew2 and Duty_Slew_MCU, takes the larger of Duty_Slew2 and Duty_Slew_MCU to obtain P_Duty2Des, limits P_Duty2Des between 0 and 100 through the first algorithm, and the limited P_Duty2Des is the speed duty cycle control signal of the water pump of the rotary motor electronic control thermal management module, which controls the water pump speed of the rotary motor electronic control thermal management module.

8. The control method of the hybrid excavator thermal management system according to claim 7, characterized in that: The water pump speed control also includes the water pump speed control of the fan thermal management module: The water pump speed control of the fan thermal management module includes: the control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, obtains the Mass Flow by summing the required flow requirements of each fan, queries the corresponding MAP diagram according to the Mass Flow to obtain the required water pump duty cycle signal P_Duty3Des, limits P_Duty3Des between 0 and 100 through a first algorithm, and the limited P_Duty3Des is the water pump speed duty cycle control signal of the high-voltage fan thermal management module, which controls the water pump speed of the fan thermal management module.

9. The control method of the hybrid excavator thermal management system according to claim 8, characterized in that: The flow distributor flow control specifically includes: The control module simultaneously collects the coil temperature and IGBT module temperature of each fan, queries the corresponding MAP diagram according to the coil temperature and the IGBT module temperature to obtain the required flow Flow_Fan, sends the required flow requirement of each fan to the VCU module, calculates the current value of each solenoid valve at the outlet of the flow distributor through the second algorithm, and controls the flow of the flow distributor.

10. A hybrid excavator thermal management device, characterized in that: It comprises a shell, in which a high-temperature radiator, an intercooler radiator, a hydraulic oil radiator, an ISG motor electronically controlled radiator, a rotary motor electronically controlled radiator and a high-pressure fan radiator are arranged. The high-temperature radiator, the intercooler radiator and the hydraulic oil radiator are installed in parallel, the ISG motor electronically controlled radiator is located in front of the high-temperature radiator, the rotary motor electronically controlled radiator is located in front of the intercooler radiator, and the high-pressure fan radiator is located in front of the hydraulic oil radiator.

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