A new energy thermal management filling and exhaust intelligent control system and method

Abstract

The present invention discloses a new energy thermal management filling and exhaust intelligent control system and method, which detects the liquid level sensor signal of the expansion tank, the motor water pump and the battery water pump current signal in real time, determines whether liquid replenishment and exhaust are needed according to the detected signals, reminds the driver to stop the car for liquid replenishment when liquid replenishment is needed, and controls the vehicle to perform corresponding actions for exhaust when exhaust is needed. The present invention can automatically identify the vehicle filling and exhaust requirements and feedback to the instrument display, and automatically perform the exhaust action through simple operation by the driver, effectively avoiding system lack of liquid or poor exhaust, improving system performance and service life, and is simple to operate without additional maintenance costs and time.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular relates to a new energy thermal management filling and exhaust intelligent control system and method. Background Art

[0002] New energy vehicles have high and different temperature control requirements for power batteries, drive motors and other assemblies. The thermal management system pipeline design is complex, and coolant filling and exhaust are cumbersome and difficult to empty.

[0003] Existing filling exhaust systems either cannot automatically identify vehicle exhaust needs, and require exhaust refilling treatment with professional diagnostic maintenance equipment at the repair point during vehicle repair or routine maintenance. Some also set up multiple expansion water tanks in the vehicle thermal management system, and set up multiple devices on the vehicle production line for coolant filling; or set up an integrated expansion water tank in the thermal management system and use a filling device, but both require the use of professional equipment for exhaust treatment.

[0004] The above thermal management system filling and exhausting have defects: the thermal management system cannot automatically identify the vehicle filling and exhausting needs, and there is inevitably air in the complex new energy thermal management circuit, which will affect the service life and performance of components such as the water pump in the thermal management system, causing system performance to decline, and may even cause the motor battery to shut down due to overheating; when the vehicle is repaired and maintained, it is necessary to use professional diagnostic equipment to identify whether the thermal management system needs exhaust and rehydration, and control the system exhaust through professional tools, which is inconvenient to operate and will incur additional costs, and the user experience is poor. Exhaust equipment is required on the vehicle production line, which is inconvenient to operate, the vehicle production cost is high, the filling efficiency is low, and the after-sales maintenance efficiency of the vehicle is low. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a new energy thermal management filling and exhaust intelligent control system and method that is easy to operate and highly efficient.

[0006] The technical solution adopted by the present invention is: a new energy thermal management filling exhaust intelligent control system, including

[0007] Motor cooling water circuit, used to cool the battery;

[0008] Battery temperature control circulation water circuit, used to cool the motor;

[0009] The expansion tank is connected to the motor cooling circulating water circuit and the battery temperature control circulating water circuit through a filling pipeline, and is connected to the motor cooling circulating water circuit and the battery temperature control circulating water circuit through a degassing pipeline;

[0010] A four-way valve is provided between the motor cooling circulation water circuit and the battery temperature control circulation water circuit;

[0011] The control module has an input end connected to the output end of the liquid level sensor of the expansion tank, the output end of the motor water pump in the motor cooling circulation water circuit, the current output end of the battery water pump in the battery temperature control circulation water circuit, the status output end of the four-way valve and the vehicle CAN bus, and an output end connected to the instrument, the motor water pump control end in the motor cooling circulation water circuit, the battery water pump control end in the battery temperature control circulation water circuit and the enable end of the four-way valve.

[0012] A new energy thermal management filling and exhaust intelligent control method is implemented based on the new energy thermal management filling and exhaust intelligent control system as mentioned above. The control module detects the liquid level sensor signal of the expansion tank, the motor water pump and the battery water pump current signal in real time, and determines whether liquid replenishment and exhaust are needed according to the detected signals. When liquid replenishment is needed, the driver is reminded to stop the vehicle for liquid replenishment, and when exhaust is needed, the vehicle is controlled to perform corresponding actions to exhaust.

[0013] Further, when it is detected that the liquid level signal of the battery liquid level sensor and / or the liquid level signal of the motor liquid level sensor is lower than the lowest liquid level line, it is determined that liquid replenishment is required.

[0014] Furthermore, the process of stopping the vehicle for rehydration is as follows:

[0015] 1) Keep the vehicle stationary and add coolant in the expansion tank to the highest liquid level;

[0016] 2) Turn the key to the ON position and press the brake pedal n+2 times within T0;

[0017] 3) Control the four-way valve to switch to state S1, control the battery water pump and the motor water pump to start and run at n% speed T P After that, the battery water pump and the motor water pump are turned off, and the four-way valve is controlled to switch to state S0;

[0018] 4) Refill coolant to the maximum liquid level line;

[0019] 5) Repeat 2)-4) until the liquid level stops dropping.

[0020] Furthermore, when the battery water pump current is detected to be lower than I B and / or the motor water pump current is lower than I M , it is determined that the cooling system needs to be vented.

[0021] Furthermore, when the battery water pump current is detected to be lower than I B When the exhaust process is:

[0022] 1) Obtain the current four-way valve state S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust;

[0023] 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0;

[0024] 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the motor water pump is controlled to start running T P Duration, battery water pump delay t seconds to start running T P -t duration;

[0025] 4) T P After that, the motor water pump and battery water pump are stopped, and the four-way valve is switched to state S0; the prompt message "Cooling system needs to be exhausted" is eliminated. If the battery water pump current is lower than I B , forward the prompt message "Battery water pump failure" to the instrument display.

[0026] Furthermore, when the battery water pump current is detected to be lower than I B When the exhaust process is:

[0027] 1) Obtain the current four-way valve state S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust;

[0028] 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0;

[0029] 3) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the battery water pump is controlled to start and run at n% speed T P Shutdown after a certain period of time;

[0030] 4) T P After that, the prompt message of "Cooling system needs to be exhausted" is eliminated. If the battery water pump current is lower than I B , forward the prompt message "Battery water pump failure" to the instrument display.

[0031] Furthermore, when the motor water pump current is detected to be lower than I M When the exhaust process is:

[0032] 1) Obtain the current four-way valve state S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust;

[0033] 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0;

[0034] 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the battery water pump is controlled to start running T P Duration, motor and water pump delay t seconds to start running TP -t duration;

[0035] 4) T P After that, the motor water pump and battery water pump are stopped, and the four-way valve is switched to state S0; the prompt message "Cooling system needs to be exhausted" is eliminated. If the motor water pump current is lower than I M , and forward the prompt message "motor water pump failure" to the instrument display.

[0036] Furthermore, when the motor water pump current is detected to be lower than I M When the exhaust process is:

[0037] 1) Obtain the current four-way valve state S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust;

[0038] 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0;

[0039] 3) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the motor water pump is controlled to start and run at n% speed T P Shutdown after a certain period of time;

[0040] 4) T P After that, the prompt message "Cooling system needs to be exhausted" is eliminated. If the motor water pump current is lower than I M , and forward the prompt message "motor water pump failure" to the instrument display.

[0041] Furthermore, when the battery water pump current is detected to be lower than I B and the motor water pump current is lower than I M When the exhaust process is:

[0042] 1) Obtain the current four-way valve state S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust;

[0043] 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0;

[0044] 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the battery water pump and the motor water pump are controlled to start and run at n% speed T P Duration, T P Then the motor water pump and battery water pump are controlled to stop, and the four-way valve is controlled to switch to state S0;

[0045] 4) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the battery water pump and the motor water pump are controlled to start and run at n% speed TP Duration, T P After that, the motor water pump and battery water pump are stopped.

[0046] 5) Eliminate the prompt message "Cooling system needs to be exhausted"; if the battery water pump current is lower than I B , the prompt message "battery water pump failure" is forwarded to the instrument display; if the motor water pump current is lower than I M , forward the prompt information "motor water pump failure" to the instrument display.

[0047] The beneficial effects of the present invention are:

[0048] The present invention can automatically diagnose whether the thermal management system needs to be filled with liquid and vented, and promptly remind the user to add liquid and vent, thereby effectively improving the performance of the thermal management system and the service life of various components.

[0049] The present invention does not need to go to a professional maintenance point or use after-sales professional equipment for exhaust treatment, and does not need to add buttons or other switches to the whole vehicle, thus saving users' maintenance time and costs, and is easy to operate and provides a good user experience.

[0050] The exhaust filling control method of the present invention, combined with an integrated expansion water tank, only requires one filling device and one person to operate on the automobile production line, thereby reducing the vehicle production cost, improving the coolant filling efficiency and production rhythm of the production line, and improving the vehicle maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Schematic diagram of the cooling system of the present invention for charging exhaust gas.

[0052] Figure 2 Schematic diagram of the control system of the present invention. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] like Figure 1 , Figure 2 As shown, the present invention provides a new energy thermal management filling exhaust intelligent control system, including

[0055] The motor cooling circulation water circuit is used to cool the battery, and the water circuit is respectively provided with filling and degassing pipelines and a motor water pump.

[0056] The battery temperature control circulating water circuit is used to cool the motor, and the water circuit is provided with filling and degassing pipelines and a battery water pump.

[0057] The expansion tank is connected to the motor cooling circulation water circuit and the battery temperature control circulation water circuit through the filling pipeline, and is connected to the motor cooling circulation water circuit and the battery temperature control circulation water circuit through the degassing pipeline; two liquid level sensors are provided on the expansion water tank to detect the liquid level of the motor battery thermal management system respectively; a partition with a height to the highest liquid level line is provided to avoid temperature cross-talk when the motor battery thermal management system works independently; and a filling port is provided for adding coolant.

[0058] The four-way valve is arranged between the motor cooling circulation water circuit and the battery temperature control circulation water circuit, and can conduct the two water circuits in the control box of the control module for liquid injection and exhaust.

[0059] The control module, the input end is connected to the output end of the liquid level sensor of the expansion tank, the output end of the motor water pump in the motor cooling circulation water circuit, the current output end of the battery water pump in the battery temperature control circulation water circuit, the state output end of the four-way valve and the vehicle CAN bus, and the output end is connected to the instrument, the motor water pump control end in the motor cooling circulation water circuit, the battery water pump control end in the battery temperature control circulation water circuit and the enable end of the four-way valve. The control module obtains the motor battery liquid level signal, water pump current signal, key gear signal, vehicle gear signal, hand brake signal, brake pedal position signal, and four-way valve state signal through hard wire or CAN line, and outputs the four-way valve enable signal, motor battery water pump speed signal, and the prompt information and fault information displayed on the instrument through signal analysis and judgment.

[0060] The present invention also provides a new energy thermal management filling and exhaust intelligent control method based on the above-mentioned new energy thermal management filling and exhaust intelligent control system, which detects the liquid level sensor signal of the expansion tank, the motor water pump and the battery water pump current signal in real time, and determines whether fluid replenishment and exhaust are needed according to the detected signals. When fluid replenishment is needed, the driver is reminded to stop the car for fluid replenishment, and when exhaust is needed, the vehicle is controlled to perform corresponding actions to exhaust.

[0061] The present invention can automatically identify the vehicle filling and exhaust requirements and feed back to the instrument display. Through simple operation by the driver, the exhaust action is automatically performed, effectively avoiding system fluid shortage or poor exhaust, improving system performance and service life, and is easy to operate without additional maintenance costs and time. The present invention uses a filling and exhaust control method combined with an integrated expansion water tank. Only one filling device and one person are required on the automobile production line. The vehicle production cost is low, the filling efficiency is high, and the after-sales maintenance efficiency of the vehicle is high.

[0062] The control method for filling and exhausting of the present invention is specifically as follows:

[0063] 1. During normal use of the vehicle:

[0064] 1. The control module reads the liquid level signals of the battery liquid level sensor and the motor liquid level sensor in real time. When it detects that the battery or motor liquid level is lower than the minimum liquid level line, the control module will forward the prompt message "Coolant level is low, please add coolant" to the instrument display to remind the driver to stop and add coolant.

[0065] 2. When the control module detects that the battery water pump current is lower than I B , the motor water pump current is higher than I M When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0066] After parking, the driver performs the following operations in sequence: shifting to neutral gear - pulling the handbrake - turning the key to the ON gear - pressing the brake pedal n times within the T0 time. That is, the exhaust action is performed only after the driver performs these operations (meeting certain conditions).

[0067] 2.1) When the four-way valve state S is S0, switch the four-way valve to state S1, and the motor water pump starts running T P Duration, battery water pump delay t seconds to start running T P -t duration, during which the motor water pump and battery water pump rotate at full speed, exhausting faster;

[0068] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module forwards the prompt message "Battery water pump failure" to the instrument display.

[0069] The motor battery water pump stops and the four-way valve status switches back to S0.

[0070] 2.2) When the four-way valve state S is S1, the four-way valve is switched to state S0, and the battery water pump starts running at n% speed T P Shutdown after a certain period of time.

[0071] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module forwards the prompt message "Battery water pump failure" to the instrument display.

[0072] 3. When the control module detects that the motor water pump current is lower than I M , the battery pump current is higher than I B When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0073] After parking, the driver performs the following steps in sequence: shift to neutral gear - pull the handbrake - turn the key to the ON gear - and press the brake pedal n times within the time T0.

[0074] 3.1) When the four-way valve state S is S0, switch the four-way valve to state S1, and the battery water pump starts running T P Duration, the motor and water pump start running after a delay of t seconds T P -t duration.

[0075] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0076] The motor battery water pump stops and the four-way valve status switches back to S0.

[0077] 3.2) When the four-way valve state S is S1, the four-way valve state is switched to S0, and the motor water pump starts running at n% speed T P Duration.

[0078] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0079] The motor water pump stops.

[0080] 4. When the control module detects that the battery water pump current is lower than I B and the motor water pump current is lower than I M When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0081] After parking, the driver performs the following steps in sequence: shift to neutral gear - pull the handbrake - turn the key to the ON gear - and press the brake pedal n times within the time T0.

[0082] 4.1) When the four-way valve state S is S0, the four-way valve state is switched to S1, and the battery motor water pump starts running at n% speed T P Duration.

[0083] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module will forward the prompt information "battery water pump failure" to the instrument display; if the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0084] The motor battery water pump stops and the four-way valve status switches back to S0.

[0085] 4.2) When the four-way valve state S is S1, the four-way valve state is switched to S0, and the battery motor water pump starts running at n% speed T P Duration.

[0086] T P After that, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module will forward the prompt information "battery water pump failure" to the instrument display; if the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0087] Motor battery water pump shut down.

[0088] The above exhaust process controls the switching of the four-way valve state S, with the purpose of changing the connection state of the water channel to facilitate exhaust.

[0089] 2. When the vehicle is offline or undergoing maintenance and coolant replacement:

[0090] (1) With the vehicle stationary, add coolant to the maximum level.

[0091] (2) Within T0 after the key is turned to the ON position, press the brake pedal n+2 times.

[0092] (3) The control module controls the four-way valve to S1 state - the battery motor water pump starts running at n% speed T P Duration - water pump shuts down - four-way valve switches to S0 state.

[0093] (4) Add coolant to the maximum liquid level.

[0094] (5) Repeat (2) to (4) until the liquid level stops dropping.

[0095] The definitions of the above parameters are as follows:

[0096] S, four-way valve status;

[0097] S0, the initial state of the four-way valve, the independent state of the motor battery thermal management system;

[0098] S1, four-way valve state 1, motor battery thermal management system series state;

[0099] I B , critical current of the battery water pump when idling;

[0100] I M , the critical current of the motor water pump when idling;

[0101] T0, preset driver action time period;

[0102] n, the preset number of driver actions;

[0103] T P , preset the running time of the water pump;

[0104] t, preset water pump delay action time.

[0105] The present invention realizes automatic identification of the filling and exhaust requirements of the new energy thermal management system through intelligent and integrated design ideas. After simple operation by the driver, the filling and exhaust can be automatically performed. The operation is convenient and saves maintenance costs and time. When the vehicle is offline and the coolant is replaced during maintenance, only one filling device and one person are required, which improves the efficiency of coolant filling and production rhythm of the production line, and improves the efficiency of vehicle maintenance.

[0106] Example:

[0107] The present invention can automatically identify the system filling and exhausting needs, and the driver can automatically fill and exhaust after simple operation; when the vehicle is offline and the coolant is replaced during maintenance, only one filling device and one person are needed.

[0108] The specific working scenarios and modes are as follows:

[0109] 1. During normal use of the vehicle:

[0110] 1. The control module reads the liquid level signals of the battery liquid level sensor and the motor liquid level sensor in real time. When it detects that the battery or motor liquid level is lower than the minimum liquid level line, the control module will forward the prompt message "Coolant level is low, please add coolant" to the instrument display to remind the driver to stop and add coolant.

[0111] 2. When the control module detects that the battery water pump current is lower than I B When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0112] The driver stops the car - puts the car in neutral - pulls the handbrake - turns the key to the ON position - and steps on the brake pedal 3 times within 6 seconds.

[0113] 2.1) When the four-way valve state S is S0, the four-way valve state is switched to S1, the motor water pump starts and runs for 2 minutes, and the battery water pump starts and runs for 1 minute and 55 seconds after a delay of 5 seconds.

[0114] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module forwards the prompt message "Battery water pump failure" to the instrument display.

[0115] The motor battery water pump stops and the four-way valve status switches back to S0.

[0116] 2.2) When the four-way valve state S is S1, the four-way valve state is switched to S0, and the battery water pump starts running at 70% speed for 2 minutes and then stops.

[0117] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module forwards the prompt message "Battery water pump failure" to the instrument display.

[0118] The battery water pump is shut down.

[0119] 3. When the control module detects that the motor water pump current is lower than I M When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0120] The driver parks the car - shifts the gear to neutral - pulls the handbrake - turns the key to the ON position - and presses the brake pedal three times within 6 seconds.

[0121] 3.1) When the four-way valve state S is S0, the four-way valve state is switched to S1, the battery water pump starts and runs for 2 minutes, and the motor water pump starts and runs for 1 minute and 55 seconds after a delay of 5 seconds.

[0122] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0123] The motor battery water pump stops and the four-way valve status switches back to S0.

[0124] 3.2) When the four-way valve state S is S1, the four-way valve state is switched to S0, and the motor water pump starts running at 70% speed for 2 minutes.

[0125] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0126] The motor water pump stops.

[0127] 4. When the control module detects that the battery water pump current is lower than I B and the motor water pump current is lower than I M When the four-way valve is turned on, the control module reads the current four-way valve state S and forwards the prompt message "Cooling system needs to be exhausted" to the instrument display to remind the driver to stop the car for exhaust.

[0128] The driver stops the car - puts the car in neutral - pulls the handbrake - turns the key to the ON position - and steps on the brake pedal 3 times within 6 seconds.

[0129] 4.1) When the four-way valve state S is S0, the four-way valve state is switched to S1, and the battery motor water pump starts running at 70% speed for 2 minutes.

[0130] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module will forward the prompt information "battery water pump failure" to the instrument display; if the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0131] The motor battery water pump stops and the four-way valve status switches back to S0.

[0132] 4.2) When the four-way valve state S is S1, the four-way valve state is switched to S0, and the battery motor water pump starts running at 70% speed for 2 minutes.

[0133] After 2 minutes, the prompt message "Cooling system needs to be exhausted" disappears. If the battery water pump current is still lower than I B , the control module will forward the prompt information "battery water pump failure" to the instrument display; if the motor water pump current is still lower than I M , the control module forwards the prompt message "motor water pump failure" to the instrument display.

[0134] Motor battery water pump shut down.

[0135] 2. When the vehicle is offline or undergoing maintenance and coolant replacement:

[0136] (1) With the vehicle stationary, add coolant to the maximum level.

[0137] (2) Within 6 seconds after turning the key to the ON position, press the brake pedal 5 times.

[0138] (3) The control module controls the four-way valve to the S1 state - the battery motor water pump starts running at 80% speed for 2 minutes - the water pump is turned off - the four-way valve is switched to the S0 state.

[0139] (4) Add coolant to the maximum liquid level.

[0140] (5) Repeat (2) to (4) until the liquid level stops dropping.

[0141] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A new energy thermal management filling exhaust intelligent control method based on a new energy thermal management filling exhaust intelligent control system, characterized in that: The new energy thermal management filling and exhaust intelligent control system includes Motor cooling water circuit, used to cool the battery; Battery temperature control circulation water circuit, used to cool the motor; The expansion tank is connected to the motor cooling circulating water circuit and the battery temperature control circulating water circuit through a filling pipeline, and is connected to the motor cooling circulating water circuit and the battery temperature control circulating water circuit through a degassing pipeline; The four-way valve is installed between the motor cooling water circuit and the battery temperature control water circuit. A control module, wherein the input end is connected to the output end of the liquid level sensor of the expansion tank, the output end of the motor water pump in the motor cooling circulating water circuit, the current output end of the battery water pump in the battery temperature control circulating water circuit, the state output end of the four-way valve and the vehicle CAN bus, and the output end is connected to the instrument, the motor water pump control end in the motor cooling circulating water circuit, the battery water pump control end in the battery temperature control circulating water circuit and the enable end of the four-way valve; Real-time detection of the liquid level sensor signal of the expansion tank, the motor water pump and the battery water pump current signal, and determination of whether liquid replenishment and exhaust are required based on the detected signals. When liquid replenishment is required, the driver is reminded to stop the vehicle for liquid replenishment, and when exhaust is required, the vehicle is controlled to perform corresponding actions for exhaust; The process of stopping and refilling fluid is as follows: 1) Keep the vehicle stationary and add coolant in the expansion tank to the highest liquid level; 2) Turn the key to the ON position and press the brake pedal n+2 times within T0; 3) Control the four-way valve to switch to state S1, control the battery water pump and the motor water pump to start and both run at n% speed T P The battery water pump and the motor water pump are then turned off, and the four-way valve is controlled to switch to state S0; the S0 state is the initial state of the four-way valve when the motor-battery thermal management system is in an independent state; the S1 state is the state of the four-way valve when the motor-battery thermal management system is in a series state; 4) Refill coolant to the maximum liquid level line; 5) Repeat 2)-4) until the liquid level stops dropping.

2. The new energy thermal management filling and exhaust intelligent control method according to claim 1 is characterized by: When it is detected that the liquid level signal of the battery liquid level sensor and / or the liquid level signal of the motor liquid level sensor is lower than the lowest liquid level line, it is determined that liquid replenishment is required.

3. The new energy thermal management filling and exhaust intelligent control method according to claim 1 is characterized by: When the battery water pump current is detected to be lower than I B and / or the motor water pump current is lower than I M , it is determined that the cooling system needs to be vented.

4. The new energy thermal management filling and exhaust intelligent control method according to claim 3 is characterized by: When the battery water pump current is detected to be lower than I B When the exhaust process is: 1) Obtain the current four-way valve status S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust; 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0; 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the motor water pump is controlled to start running T P Duration, battery water pump delay t seconds to start running T P -t duration; 4) T P After that, the motor water pump and battery water pump are stopped, and the four-way valve is switched to state S0; the prompt message "Cooling system needs to be exhausted" is eliminated. If the battery water pump current is lower than I B , forward the prompt message "battery water pump failure" to the instrument display.

5. The new energy thermal management filling and exhaust intelligent control method according to claim 3 is characterized by: When the battery water pump current is detected to be lower than I B When the exhaust process is: 1) Obtain the current four-way valve status S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust; 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0; 3) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the battery water pump is controlled to start and run at n% speed T P Shutdown after a certain period of time; 4) T P After that, the prompt message "Cooling system needs to be exhausted" is eliminated. If the battery water pump current is lower than I B , forward the prompt message "battery water pump failure" to the instrument display.

6. The new energy thermal management filling and exhaust intelligent control method according to claim 3 is characterized by: When the motor water pump current is detected to be lower than I M When the exhaust process is: 1) Obtain the current four-way valve status S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust; 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0; 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the battery water pump is controlled to start running T P Duration, motor and water pump delay t seconds to start running T P -t duration; 4) T P After that, the motor water pump and battery water pump are stopped, and the four-way valve is switched to state S0; the prompt message "Cooling system needs to be exhausted" is eliminated. If the motor water pump current is lower than I M , forward the prompt information "motor water pump failure" to the instrument display.

7. The new energy thermal management filling and exhaust intelligent control method according to claim 3 is characterized by: When the motor water pump current is detected to be lower than I M When the exhaust process is: 1) Obtain the current four-way valve status S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust; 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0; 3) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the motor water pump is controlled to start and run at n% speed T P Shutdown after a certain period of time; 4) T P After that, the prompt message "Cooling system needs to be exhausted" is eliminated. If the motor water pump current is lower than I M , forward the prompt information "motor water pump failure" to the instrument display.

8. The new energy thermal management filling and exhaust intelligent control method according to claim 3 is characterized by: When the battery water pump current is detected to be lower than I B and the motor water pump current is lower than I M When the exhaust process is: 1) Obtain the current four-way valve status S, forward the prompt message "cooling system needs to be exhausted" to the instrument display, and remind the driver to stop the car to exhaust; 2) After parking, the driver performs the following steps: shift the car into neutral, apply the handbrake, turn the key to the ON position, and press the brake pedal n times within T0; 3) When the four-way valve state S is S0, the four-way valve is controlled to switch to state S1, and the battery water pump and the motor water pump are controlled to start and run at n% speed T P Duration, T P Then the motor water pump and battery water pump are controlled to stop, and the four-way valve is controlled to switch to state S0; 4) When the four-way valve state S is S1, the four-way valve is controlled to switch to state S0, and the battery water pump and the motor water pump are controlled to start and run at n% speed T P Duration, T P Afterwards, the motor water pump and battery water pump are controlled to stop; 5) Eliminate the prompt message "Cooling system needs to be exhausted"; if the battery water pump current is lower than I B , the prompt message "battery water pump failure" is forwarded to the instrument display; if the motor water pump current is lower than I M , forward the prompt information "motor water pump failure" to the instrument display.

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