Degassing control system for new energy automobile cooling liquid filling

Abstract

The utility model discloses a degassing control system for new energy automobile cooling liquid filling. The degassing control system comprises a degassing signal output terminal, a vehicle-mounted controller, a cooling system water pump controller and a sensor system. The degassing signal output terminal is connected with the vehicle-mounted controller and is used for sending a degassing control signal for filling cooling liquid to the vehicle-mounted controller; the input end of the vehicle-mounted controller is connected with the sensor system, and the vehicle-mounted controller is used for acquiring a state signal of a vehicle through the sensor system; the output end of the vehicle-mounted controller is connected with the cooling system water pump controller and used for controlling and driving the cooling system water pump controller to work according to the obtained vehicle state signal, and the output end of the cooling system water pump controller is connected with the cooling system water pump and used for controlling the cooling system water pump to work. According to the scheme, gas in the cooling system can be automatically exhausted when the cooling liquid is injected.

Description

Technical Field

[0001] The utility model relates to the field of automobile electronic control, in particular to a degassing control system when refilling coolant of a new energy automobile. Background Art

[0002] With the rapid development of the automobile industry, new energy vehicles are becoming more and more popular, and battery liquid cooling technology is gradually maturing. Liquid-cooled batteries can control the battery temperature within a certain range, so that the battery has the best performance during charging and discharging, and at the same time extend the battery life. Therefore, liquid-cooled batteries have been widely used in new energy electric vehicles. For example, a power battery cooling system for a new energy bus with patent application number 201510126569.7 includes a battery box and a circulating air duct connected to the battery box. The battery box and the circulating air duct form a closed cavity, and the cavity is filled with cooling medium. A radiator for heat exchange is arranged on the circulating air duct, and the radiator is arranged close to the evaporator of the external air conditioning system. A driving fan is arranged on the circulating air duct and located between the battery box and the radiator.

[0003] The battery cooling system disclosed in the above patent can complete the liquid cooling control of the car and ensure the reliable operation of the vehicle. It can be seen that the battery cooling system has become a standard configuration for new energy vehicles, and newly launched models have gradually been equipped with battery cooling systems. The number of liquid cooling components and cooling pipes in the entire cooling system has increased. When the liquid cooling components need to be replaced after sales, the coolant needs to be manually refilled after it is emptied. When refilling, there are many liquid cooling components and cooling pipes in the system, and the system is difficult to degas. The coolant is difficult to refill, and it is usually impossible to refill to the rated filling amount. Insufficient coolant filling will cause high temperature failures in liquid cooling components such as motors and batteries. Traditional degassing is relatively complicated and costly. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a degassing control system for filling coolant in new energy vehicles, which can quickly exhaust gas by controlling the vehicle's cooling system to start when filling coolant.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a degassing control system for filling coolant in new energy vehicles, including a degassing signal output terminal, an on-board controller, a cooling system water pump controller and a sensor system; the degassing signal output terminal is connected to the on-board controller, for sending a degassing control signal for filling coolant to the on-board controller; the input end of the on-board controller is connected to the sensor system, for obtaining a vehicle status signal through the sensor system; the output end of the on-board controller is connected to the cooling system water pump controller, for controlling the operation of the cooling system water pump controller according to the obtained vehicle status signal, and the output end of the cooling system water pump controller is connected to the cooling system water pump, for controlling the operation of the cooling system water pump.

[0006] The degassing signal output terminal is a vehicle diagnostic instrument, which is connected to the vehicle network through the vehicle OBD port and is connected to the vehicle controller.

[0007] The vehicle-mounted controller is a vehicle controller VCU.

[0008] The sensor system includes a vehicle stationary detection module, a vehicle gear detection module, and a vehicle charging gun insertion status detection module. The vehicle stationary detection module, the vehicle gear detection module, and the vehicle charging gun insertion status detection module are used to respectively detect the vehicle's stationary state, the vehicle gear state, and the vehicle charging gun insertion state, and are respectively connected to the input end of the vehicle-mounted controller.

[0009] The cooling system water pump includes a motor cooling system water pump and a battery cooling system water pump.

[0010] The on-board controller is connected to a timer, and the timer is used to provide a timing signal for the on-board controller; the on-board controller controls the cooling system water pump to perform intermittent operation according to the timing signal.

[0011] The sensor system further comprises a fault signal acquisition module, and the fault signal acquisition module is used to acquire a fault signal of the cooling system.

[0012] The advantages of the utility model are: when the new energy vehicle is filled with coolant, the gas in the cooling system is discharged by controlling the automatic operation of the vehicle's water pump, thereby reducing the time for coolant filling, and the exhaust can be automatically carried out while the liquid is filled, and the start control can be achieved by only giving an open control signal. The VCU can automatically control the exhaust according to the detected vehicle status. The system structure is simple and reliable, and can ensure that the gas is quickly discharged during filling, avoiding the defect that the coolant cannot be filled to the set level due to the presence of gas in the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0014] Figure 1 This is a schematic diagram of the exhaust control system of the utility model. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0016] When a new energy vehicle is filled with coolant without exhausting, the added liquid cannot meet the most set requirements, which may result in less coolant liquid, affecting the safety of the vehicle. If some professional instruments and equipment are used for exhaust, it will be time-consuming and labor-intensive, and it is impossible to perform automatic exhaust control while filling the coolant. Therefore, the existing technologies all have certain defects. Therefore, this embodiment provides an exhaust gas degassing control system when the coolant of a new energy vehicle is filled. The specific scheme is as follows:

[0017] like Figure 1 As shown, a degassing control system for refilling coolant of a new energy vehicle includes a degassing signal output terminal, an on-board controller, a cooling system water pump controller, and a sensor system;

[0018] The degassing signal output terminal is connected to the vehicle-mounted controller, and is used to send a degassing control signal for adding coolant to the vehicle-mounted controller; the input end of the vehicle-mounted controller is connected to the sensor system, and is used to obtain the vehicle status signal through the sensor system; the output end of the vehicle-mounted controller is connected to the cooling system water pump controller, and is used to control the operation of the cooling system water pump controller according to the obtained vehicle status signal, and the output end of the cooling system water pump controller is connected to the cooling system water pump, and is used to control the operation of the cooling system water pump.

[0019] In this embodiment, the degassing signal output terminal is a vehicle diagnostic instrument, which is connected to the vehicle network through the vehicle-mounted OBD port and connected to the vehicle-mounted controller. The vehicle-mounted controller, as a control device in the vehicle, is also connected to the CAN network. Therefore, the vehicle diagnostic instrument can complete the communication and interactive connection with the vehicle-mounted controller by connecting to the vehicle's CAN network through the OBD port; the vehicle-mounted controller is implemented by the vehicle controller VCU. Since the vehicle controller VCU has higher authority, the vehicle's cooling system water pump can be controlled through the controller.

[0020] The sensor system includes a vehicle stationary detection module, a vehicle gear detection module, and a vehicle charging gun insertion state detection module. The vehicle stationary detection module, the vehicle gear detection module, and the vehicle charging gun insertion state detection module are used to detect the stationary state of the vehicle, the gear state of the vehicle, and the vehicle charging gun insertion state, respectively, and are connected to the input end of the vehicle controller respectively. Among them, the vehicle stationary detection module can be implemented by a vehicle speed / wheel speed sensor. When the vehicle speed or wheel speed is detected to be 0, the vehicle is judged to be in a stationary state. The stationary state of the vehicle can be judged according to the vehicle speed or wheel speed. The vehicle speed or wheel speed sensor here can reuse the vehicle-mounted vehicle speed or wheel speed sensor, thereby saving costs. The vehicle gear detection module is used to detect the vehicle's gear position, high-voltage power-on and other status signals. These signals are parameter data existing in the vehicle network system for electric vehicles, so they can be obtained by reading the CAN signal on the vehicle, that is, the VCU only needs to read the data in the vehicle CAN network through the CAN module or the CAN unit built into the VCU to obtain the gear position and power-on and power-off status signals to realize the gear detection module. The charging gun insertion status detection module is used to detect whether the vehicle is plugged into the charging gun. It can use an external detection sensor or the vehicle's own sensor. Therefore, the insertion status of the charging gun can be determined by reading the charger's CC, CP and other signals.

[0021] In the present application, the cooling system water pump includes the motor cooling system water pump and the battery cooling system water pump. When controlling the operation of the water pump motor, the motor cooling system water pump and the battery cooling system water pump need to be controlled simultaneously.

[0022] The sensor system also includes a fault signal acquisition module, which is used to acquire fault signals of the cooling system. When the system fails, especially when the water pump fails, exhaust cannot be performed, and automatic exhaust control cannot be performed. At the same time, the fault signal can be fed back through the diagnostic instrument. The VCU controls whether the automatic control system of this embodiment works according to the fault status signal, and stops working when a fault signal is received during operation.

[0023] The working principle corresponding to the above embodiment is: when the vehicle is powered off, the vehicle diagnostic instrument is connected to the vehicle through the OBD port, and then the coolant is manually added. At this time, the ignition is turned on to the ON gear or HV_Ready; then the coolant filling and exhaust start instruction is sent through the diagnostic instrument; the signal is transmitted to the VCU through the OBD port, and when the vehicle is in a stationary state, the vehicle is in the ON gear and is in a non-driving state, and the vehicle is in a non-plugged state, the diagnostic instrument sends an opening instruction to the VCU at this time; the VCU controls the water pump of the cooling system to work, that is, the motor cooling system water pump and the battery cooling system water pump are started at the same time, and the water pump starts running to discharge the gas, and the gas is discharged at the expansion pot. Bubbles can be seen coming out, and the gas is discharged at this time. When the VCU issues an instruction, it will detect the state of the vehicle through the sensor system. When the state of the vehicle meets the conditions, the water pump will be controlled to run, otherwise the water pump will not be controlled to run, that is, the following conditions are met at the same time, the VCU feedbacks a positive response instruction, and the motor cooling system water pump and the battery cooling system water pump are started at the same time, otherwise the VCU feedbacks a negative response instruction and does not start. The conditions met include the vehicle being stationary as detected by the sensor, the vehicle being in HV_Ready, the vehicle being unplugged, and there being no water pump-related faults.

[0024] When the coolant is filled, the exhaust control system can be shut down through the diagnostic instrument, or it can run to the set time or there is a fault, etc., including: Condition 1: receiving the exit command of the diagnostic equipment; Condition 2: the water pump working time reaches 3 minutes; Condition 3: the vehicle is in a non-high pressure state; Condition 4: there is a water pump-related fault.

[0025] A manual filling and degassing strategy for coolant in new energy vehicles in the above-mentioned embodiment has the advantages of simple operation, good degassing effect of manual filling of coolant after sales, smooth coolant filling, high manual filling efficiency, and effective avoidance of high temperature failures of liquid-cooled components such as motors and batteries caused by insufficient manual filling of coolant after sales.

[0026] In a preferred embodiment, the on-board controller is connected to a timer, and the timer is used to provide a timing signal for the on-board controller; the on-board controller controls the cooling system water pump to run intermittently according to the timing signal. Its working principle is: when exhaust is needed, the water pump is controlled to work, and the work of the water pump is not continuous, but intermittent. Through the interaction with the VCU through the diagnostic instrument, the motor cooling system water pump and the battery cooling system water pump are forced to start, so that they run at full speed intermittently, and the water circulation is forced to be carried out to exhaust the air in the cooling system, so as to facilitate the manual filling of the coolant. The purpose of doing this is to speed up the exhaust speed and the filling of the coolant. In order to improve the efficiency of manual filling of the coolant, the motor cooling system water pump and the battery cooling system water pump adopt an intermittent operation strategy, such as: the water pump runs for 10 seconds, stops for 3 seconds, and cycles.

[0027] 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, they are all within the protection scope of the present invention.

Claims

1. A degassing control system for filling coolant of new energy vehicles, characterized in that: It includes a degassing signal output terminal, a vehicle-mounted controller, a cooling system water pump controller and a sensor system; the degassing signal output terminal is connected to the vehicle-mounted controller, and is used to send a degassing control signal for filling coolant to the vehicle-mounted controller; the input end of the vehicle-mounted controller is connected to the sensor system, and is used to obtain a vehicle status signal through the sensor system; the output end of the vehicle-mounted controller is connected to the cooling system water pump controller, and is used to control the operation of the cooling system water pump controller according to the obtained vehicle status signal; the output end of the cooling system water pump controller is connected to the cooling system water pump, and is used to control the operation of the cooling system water pump.

2. A degassing control system for filling coolant of new energy vehicles as claimed in claim 1, characterized in that: The degassing signal output terminal is a vehicle diagnostic instrument, which is connected to the vehicle network through the vehicle OBD port and is connected to the vehicle controller.

3. A degassing control system for filling coolant of new energy vehicles as claimed in claim 1, characterized in that: The on-board controller is a vehicle controller VCU.

4. A degassing control system for filling coolant of a new energy vehicle as claimed in claim 1, characterized in that: The sensor system includes a vehicle stationary detection module, a vehicle gear detection module, and a vehicle charging gun insertion status detection module. The vehicle stationary detection module, the vehicle gear detection module, and the vehicle charging gun insertion status detection module are used to respectively detect the vehicle's stationary state, the vehicle gear state, and the vehicle charging gun insertion state, and are respectively connected to the input end of the vehicle-mounted controller.

5. A degassing control system for filling coolant of new energy vehicles as claimed in claim 1, characterized in that: The cooling system water pump includes a motor cooling system water pump and a battery cooling system water pump.

6. A degassing control system for filling coolant of new energy vehicles as claimed in claim 1, characterized in that: The on-board controller is connected to a timer, and the timer is used to provide a timing signal for the on-board controller; the on-board controller controls the cooling system water pump to perform intermittent operation according to the timing signal.

7. A degassing control system for filling coolant of a new energy vehicle according to any one of claims 1 to 6, characterized in that: The sensor system further comprises a fault signal acquisition module, and the fault signal acquisition module is used to acquire a fault signal of the cooling system.

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