Control system and control method for central heat management integrated module of new energy automobile

Abstract

The invention provides a new energy automobile central heat management integrated module control system and method, and belongs to the technical field of automobile heat management control. The system comprises a sensor module, a control module, a driving module and an execution module. The sensor module inputs automobile state information to the control module, the control module outputs a control instruction to the driving module, and the driving module outputs the converted control instruction to the execution module. After the automobile is powered on, the control module controls the water pump to work, and state information of the automobile is collected through the sensor module; the control module generates a control instruction through a control algorithm according to the state information of the automobile and outputs the control instruction to the driving module; and the driving module outputs the converted control instruction to the execution module, and the execution module executes the instruction. The automobile thermal management efficiency is improved, and meanwhile the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile thermal management control, and in particular, relates to a central thermal management integrated module control system and a control method for a new energy automobile. Background Art

[0002] With the rapid development of the new energy vehicle industry, the requirements for vehicle thermal management systems are getting higher and higher. The thermal management system of traditional new energy vehicles is often composed of multiple independent control units. The information interaction and coordinated control between these units are relatively complex and costly. Therefore, it is particularly important to develop an efficient and integrated central thermal management control module.

[0003] Chinese patent 103448561A discloses a thermal management device for an electric vehicle system, including a coolant pump, several subsystems, a first heat dissipation pipeline, at least two multi-way valves and a controller, wherein: the first heat dissipation pipeline includes a cooling pipeline and a recovery pipeline, the coolant pump is connected to each subsystem through the cooling pipeline, and the coolant pump is connected to the recovery pipeline connected to each subsystem to form a circulation pipeline; the at least two multi-way valves are respectively arranged on the cooling pipeline and the recovery pipeline; the controller is electrically connected to the at least two multi-way valves and each subsystem respectively; in this way, the controller detects the temperature and temperature control state of each subsystem, and controls the opening sequence of the at least two multi-way valves according to the temperature and temperature control state of each subsystem, so that the coolant flows to each subsystem in sequence to perform cooling work.

[0004] The thermal management of the prior art is divided into multiple subsystems, which complicates the thermal management control of the vehicle, reduces the efficiency of the thermal management of the vehicle, and increases the cost. Summary of the invention

[0005] The present invention aims to provide a central thermal management integrated module control system and a control method for a new energy vehicle, so as to improve the thermal management efficiency of the vehicle and reduce the cost.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a new energy vehicle central thermal management integrated module control system, comprising a sensor module, a control module, a drive module and an execution module, wherein the output end of the sensor module is connected to the input end of the control module, the output end of the control module is connected to the input end of the drive module, and the output end of the drive module is connected to the input end of the execution module.

[0008] The sensor module inputs the vehicle status information to the control module, the control module outputs the control instruction to the drive module, and the drive module outputs the converted control instruction to the execution module.

[0009] The sensor module includes a refrigerant pressure sensor, an in-vehicle temperature sensor and a coolant temperature sensor.

[0010] The control module adopts a microcontroller.

[0011] The driving module includes a brushless DC motor driving chip, a brushed DC motor driving chip and a bipolar stepper motor driving chip, and the output end of the control module is respectively connected to the input end of the brushless DC motor driving chip, the input end of the brushed DC motor driving chip and the input end of the bipolar stepper motor driving chip.

[0012] The execution module includes a water pump, a multi-way valve and an electronic expansion valve.

[0013] The output end of the brushless DC motor driving chip is connected to the input end of the water pump, the output end of the brushed DC motor driving chip is connected to the input end of the multi-way valve, and the output end of the bipolar stepping motor driving chip is connected to the input end of the electronic expansion valve.

[0014] The present invention provides a control method for a central thermal management integrated module control system of a new energy vehicle, which is characterized by:

[0015] Step 1: After the car is powered on, the control module controls the water pump to work and collects the car's status information through the sensor module;

[0016] Step 2: The control module generates control instructions based on the vehicle status information and outputs them to the drive module through the control algorithm;

[0017] Step 3: The driver module outputs the converted control instructions to the execution module, and the execution module executes the instructions.

[0018] In step 1, the control module controls the operation of the water pump through the brushless DC motor driver chip.

[0019] In step 2, the control module adjusts the opening of the multi-way valve and the electronic expansion valve in real time through a control algorithm according to the detected vehicle status information and the target value of the vehicle status information in the control module.

[0020] The technical effects of the present invention are:

[0021] (1) The present invention provides a microcontroller to realize the control of multiple actuators and coordinate them with each other, thereby improving the efficiency of automobile thermal management and reducing costs.

[0022] (2) The vector control algorithm is integrated into the brushless DC motor driver chip. The water pump controlled by the brushless DC motor driver chip has the advantage of maintaining high-efficiency operation under different load conditions while reducing the load on the microcontroller.

[0023] (3) The microcontroller exchanges information with other on-board control modules at a high rate through the CAN FD communication interface, providing a basis for the intelligent control of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] This specification includes the following drawings, which show the following contents:

[0025] Figure 1 This is a logical structure diagram of a central thermal management integrated module control system and control method for a new energy vehicle of the present invention;

[0026] Figure 2 A water pump driving circuit diagram of a central thermal management integrated module control system and control method for a new energy vehicle of the present invention;

[0027] Figure 1 Marked as: 1. sensor module; 2. control module; 3. drive module; 4. execution module. DETAILED DESCRIPTION

[0028] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0029] The present invention provides a new energy vehicle central thermal management integrated module control system, comprising a sensor module 1, a control module 2, a drive module 3 and an execution module 4, wherein the output end of the sensor module 1 is connected to the input end of the control module 2, the output end of the control module 2 is connected to the input end of the drive module 3, and the output end of the drive module 3 is connected to the input end of the execution module 4. The sensor module 1 inputs vehicle status information to the control module 2, the control module 2 outputs control instructions to the drive module 3, and the drive module 3 outputs the converted control instructions to the execution module 4.

[0030] The sensor module 1 includes a refrigerant pressure sensor, an in-vehicle temperature sensor and a coolant temperature sensor. The control module 2 uses a microcontroller. The drive module 3 includes a brushless DC motor drive chip, a DC brush motor drive chip and a bipolar stepper motor drive chip. The output end of the control module 2 is respectively connected to the input end of the brushless DC motor drive chip, the input end of the DC brush motor drive chip and the input end of the bipolar stepper motor drive chip. The execution module 4 includes a water pump, a multi-way valve and an electronic expansion valve. The output end of the brushless DC motor drive chip is connected to the input end of the water pump, the output end of the DC brush motor drive chip is connected to the input end of the multi-way valve, and the output end of the bipolar stepper motor drive chip is connected to the input end of the electronic expansion valve.

[0031] The present invention provides a control method for a central thermal management integrated module control system of a new energy vehicle, which is characterized by:

[0032] Step 1: After the car is powered on, the control module 2 controls the water pump to work and collects the state information of the car through the sensor module 1;

[0033] Step 2: The control module 2 generates a control instruction based on the vehicle status information and outputs it to the drive module 3 through a control algorithm;

[0034] Step 3: The driving module 3 outputs the converted control instruction to the execution module 4, and the execution module 4 executes the instruction.

[0035] In step 1, the control module 2 controls the water pump to work through the brushless DC motor driver chip. In step 2, the control module 2 adjusts the opening of the multi-way valve and the electronic expansion valve in real time through the control algorithm according to the detected vehicle status information and the target value of the vehicle status information in the control module 2.

[0036] The following describes in detail a control system and a control method for a central thermal management integrated module of a new energy vehicle according to the present invention.

[0037] The central thermal management integrated module control system of a new energy vehicle of the present invention comprises a sensor module 1, a control module 2, a drive module 3 and an execution module 4, wherein the sensor module 1 comprises a refrigerant pressure sensor, an in-vehicle temperature sensor and a coolant temperature sensor, and the refrigerant pressure sensor is used to detect the pressure of the refrigerant so as to take measures in advance to protect the safety of the vehicle and people when the refrigerant pressure is too high. The in-vehicle temperature sensor is used to detect the temperature in the vehicle. The coolant temperature sensor detects the temperature of the coolant, and the cooling demand of the vehicle battery can be reflected by the coolant temperature.

[0038] The control module 2 uses a microcontroller, which is used to collect the state information of the car through the sensor module 1, and send control instructions to the drive module 3 according to the state information of the car, and control the execution module 4 to execute the control instructions through the signal conversion of the drive module 3. The microcontroller exchanges information with other vehicle control modules at a high rate through the CAN FD communication interface, providing a basis for the intelligent control of the whole vehicle. In the embodiment of the present invention, the microcontroller uses the Z20K series MCU of Zhixin Semiconductor.

[0039] The drive module 3 includes a brushless DC motor drive chip, a brushed DC motor drive chip and a bipolar stepper motor drive chip. The brushless DC motor drive chip is a pre-drive chip used to drive the brushless DC motor in the water pump. The brushed DC motor drive chip is used to drive the brushed DC motor in the multi-way valve. The bipolar stepper motor drive chip is used to drive the bipolar stepper motor in the electronic expansion valve.

[0040] The execution module 4 includes a water pump, a multi-way valve and an electronic expansion valve. The water pump is used to promote the circulation of the coolant in the whole system. The multi-way valve is used to connect different flow channels to control the pipelines through which the coolant flows. At the same time, the rotation angle of the multi-way valve core determines the degree of interconnection between different pipelines and the flow rate of the coolant. The electronic expansion valve is used to control the flow rate of the refrigerant to achieve the purpose of regulating the temperature. The multi-way valve is connected to a Hall sensor, which accurately reflects the opening change of the multi-way valve to accurately control the control module 2.

[0041] The output of the refrigerant pressure sensor, the output of the in-vehicle temperature sensor, and the output of the coolant temperature sensor in the sensor module 1 are connected to the input of the microcontroller through the CAN bus, and the output of the microcontroller is connected to the input of the brushless DC motor driver chip through the IIC bus. The output of the brushless DC motor driver chip is connected to the brushless DC motor in the water pump through 6 NMOS. Figure 2 As shown, the output terminals 101, 102, 103, 104, 105 and 106 of the BLDC motor driver chip are respectively connected to the gate of the NMOS tube 201, the gate of the NMOS tube 202, the gate of the NMOS tube 203, the gate of the NMOS tube 204, the gate of the NMOS tube 205 and the gate of the NMOS tube 206, the output terminal 107 of the BLDC motor driver chip is respectively connected to the source of the NMOS tube 204, the source of the NMOS tube 205 and the source of the NMOS tube 206, the source of the NMOS tube 204, the source of the NMOS tube 205 and the source of the NMOS tube 206 are respectively grounded through the resistor R1, and the source of the NMOS tube 201, the source of the NMOS tube 202 and the source of the NMOS tube 203 are respectively connected to the U, V and W phases of the brushless DC motor in the water pump. There are three water pumps in the embodiment of the present invention, including two 120W water pumps and one 80W water pump. The output end of the microcontroller is connected to the input end of the DC brush motor driver chip through the SPI bus, and the output end of the DC brush motor driver chip is connected to the input end of the DC brush motor in the multi-way valve. The output end of the microcontroller is connected to the input end of the bipolar stepper motor driver chip through the SPI bus, and the output end of the bipolar stepper motor driver chip is connected to the input end of the bipolar stepper motor in the electronic expansion valve. In the embodiment of the present invention, there are two groups of electronic expansion valves.

[0042] A control method of a central thermal management integrated module control system for a new energy vehicle of the present invention is as follows:

[0043] After the car is powered on, the control module 2 sends a control instruction to control the water pump. Specifically, the control module 2 sends a control instruction to the brushless DC motor driver chip, and the brushless DC motor driver chip controls 6 NMOS tubes to drive the brushless DC motor in the water pump to achieve the purpose of controlling the water pump. The brushless DC motor driver chip integrates a vector control algorithm. The water pump controlled by the brushless DC motor driver chip has the advantage of maintaining high efficiency under different load conditions, while reducing the load of the microcontroller.

[0044] The refrigerant pressure sensor, in-vehicle temperature sensor and coolant temperature sensor in the sensor module 1 detect the refrigerant pressure, in-vehicle temperature and coolant temperature respectively, and transmit these vehicle status information to the microcontroller. The microcontroller adjusts the opening of the multi-way valve and the opening of the electronic expansion valve through the PID algorithm according to these vehicle status information and the target refrigerant pressure, target in-vehicle temperature and target coolant temperature in the microcontroller. Specifically, the control module 2 outputs control instructions to the DC brush motor driver chip and the bipolar stepper motor driver chip respectively. The DC brush motor driver chip controls the DC brush motor in the multi-way valve, and the bipolar stepper motor driver chip controls the bipolar stepper motor in the electronic expansion valve.

[0045] The present invention provides a microcontroller to realize the control of multiple actuators and to coordinate with each other, thereby improving the efficiency of automobile thermal management and reducing the cost.

[0046] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A central thermal management integrated module control system for new energy vehicles, characterized in that: It includes a sensor module, a control module, a driving module and an execution module, wherein the output end of the sensor module is connected to the input end of the control module, the output end of the control module is connected to the input end of the driving module, and the output end of the driving module is connected to the input end of the execution module.

2. A new energy vehicle central thermal management integrated module control system as claimed in claim 1, characterized in that: The sensor module inputs the vehicle status information to the control module, the control module outputs the control instruction to the drive module, and the drive module outputs the converted control instruction to the execution module.

3. A new energy vehicle central thermal management integrated module control system as claimed in claim 1, characterized in that: The sensor module includes a refrigerant pressure sensor, an in-vehicle temperature sensor and a coolant temperature sensor.

4. A new energy vehicle central thermal management integrated module control system as claimed in claim 1, characterized in that: The control module adopts a microcontroller.

5. A new energy vehicle central thermal management integrated module control system as claimed in claim 1, characterized in that: The driving module includes a brushless DC motor driving chip, a brushed DC motor driving chip and a bipolar stepper motor driving chip, and the output end of the control module is respectively connected to the input end of the brushless DC motor driving chip, the input end of the brushed DC motor driving chip and the input end of the bipolar stepper motor driving chip.

6. A new energy vehicle central thermal management integrated module control system as claimed in claim 1, characterized in that: The execution module includes a water pump, a multi-way valve and an electronic expansion valve.

7. A new energy vehicle central thermal management integrated module control system as claimed in claim 5 or 6, characterized in that: The output end of the brushless DC motor driving chip is connected to the input end of the water pump, the output end of the brushed DC motor driving chip is connected to the input end of the multi-way valve, and the output end of the bipolar stepping motor driving chip is connected to the input end of the electronic expansion valve.

8. A control method for a central thermal management integrated module control system for a new energy vehicle according to any one of claims 1 to 7, characterized in that: Step 1: After the car is powered on, the control module controls the water pump to work and collects the car's status information through the sensor module; Step 2: The control module generates control instructions based on the vehicle status information and outputs them to the drive module through the control algorithm; Step 3: The driver module outputs the converted control instructions to the execution module, and the execution module executes the instructions.

9. A control method for a central thermal management integrated module control system for a new energy vehicle as claimed in claim 8, characterized in that: In step 1, the control module controls the operation of the water pump through the brushless DC motor driver chip.

10. A control method for a central thermal management integrated module control system for a new energy vehicle as claimed in claim 8, characterized in that: In step 2, the control module adjusts the opening of the multi-way valve and the electronic expansion valve in real time through a control algorithm according to the detected vehicle status information and the target value of the vehicle status information in the control module.

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