WO2023093540A1

WO2023093540A1 - Method for controlling filling and emptying of cooling liquid

Info

Publication number: WO2023093540A1
Application number: PCT/CN2022/131212
Authority: WO
Inventors: 林承伯; 乔艳菊; 吴广权; 张旭; 丘胜强; 何炎迎
Original assignee: 广州汽车集团股份有限公司
Priority date: 2021-11-26
Filing date: 2022-11-10
Publication date: 2023-06-01
Also published as: CN116181475A

Abstract

Disclosed is a method for controlling the filling and emptying of a cooling liquid, comprising: by means of an information interaction between a user and a whole vehicle controller, enabling an EMS to identify a cooling liquid filling behavior of the user, and controlling a water pump module and a temperature control module to ignore a rapid engine heating demand within a short period of time of this driving cycle and act according to a cooling liquid filling and emptying strategy to empty an entire cooling system, so as to ensure that the cooling liquid can be successfully filled. The method specifically comprises the steps of determining the feasibility of the cooling liquid filling and emptying strategy, the EMS identifying a user-set operation, the EMS determining a water pump type, the water pump module and the temperature control module executing the cooling liquid filling and emptying strategy, determining whether the cooling liquid filling and emptying strategy is successfully ended and the like. According to the present invention, subsequent insufficient cooling of an engine or a false failure alarm of an electronic water pump caused by cooling liquid filling failure due to characteristics of an electrified cooling system is avoided.

Description

A method for controlling filling and emptying of coolant

This application claims the priority of the Chinese patent application with the application number 202111423045.6 and the title of the invention "a cooling liquid filling and emptying control method" submitted to the China Patent Office on November 26, 2021, the entire contents of which are incorporated by reference in In this application.

technical field

The invention relates to the technical field of engines, in particular to a method for controlling filling and emptying of coolant.

Background technique

At present, the cooling system scheme used in the whole vehicle on the market is usually a mechanical water pump + thermostat, in which the thermostat is used to realize the adjustment of the two branches of the large circulation of the radiator and the small circulation of the bypass. The thermostat is generally designed to gradually open the large cycle when it reaches 80-90°C, so that the flow enters the radiator for heat dissipation. Neither the mechanical water pump nor the thermostat in the conventional scheme can be actively controlled, but since the thermostat can at least ensure that the small circulation is always open in the cold state, the structure of the entire cooling system is connected. When the coolant is added, the coolant can flow through the to various locations in the system. In addition, the mechanical water pump is driven by the engine, and the mechanical water pump works immediately when the engine is working. It will not stop working due to lack of water in the system or local air bubbles.

Therefore, when leaving the factory, the manufacturer vacuumizes and fills the system, or after-sales, when the user fills the coolant by himself, no special operations are required. It is only necessary to start the engine for 3-5 minutes after filling, and stir the cooling through the mechanical water pump. Liquid, let the air and liquid inside the system fully mix, then circulate to the expansion tank, and then discharge from the expansion tank.

However, after the electrification of the cooling system, mechanical water pumps and thermostats were replaced by electronic water pumps and temperature control modules (electrically controlled ball valves), a series of problems emerged. For example, the electronic water pump is decoupled from the engine speed. In order to achieve rapid warm-up when the engine is cold started, the electronic water pump often does not work, or only works in a small amount, which cannot fully stir the coolant and air. And because the upper part of the volute water chamber is often difficult to fill with water, that is, the air cannot be completely discharged in the initial state. At this time, the electronic water pump is forced to start, because the water chamber is not fully loaded, and the electronic water pump cannot reach the required power at the same speed. , it is easy to be judged by the controller as dry running, so that the work is forcibly stopped. In this state, the electronic water pump actually reports a fault by mistake, but it will not be able to continue the process of filling and emptying, nor can it continue to start the engine. In addition, during the cold start of the engine, the temperature control module usually adjusts the opening to the minimum value, or even closes it completely to completely close the small circulation. At this time, the cooling system branch of the engine is forcibly cut off, and after the coolant enters the engine, It is impossible to flow through every area, and the liquid level has been filled up from the expansion tank, but the actual engine is not filled up at all, and it is easy to have insufficient cooling during the subsequent work process.

A common solution to the above problems on the market is to vacuumize the system and fill the system. After the system air is completely pumped out, the coolant is injected. At this time, the coolant can flow to various positions in the whole system by itself under the action of the pressure difference. , to fill each interval, vacuuming requires specific occasions and tools. However, vacuuming generally uses the Bernoulli effect. First, high-pressure gas is required. When the gas flow rate is high, its internal static pressure drops. Vacuum inside the system. However, whether it is high-pressure gas or vacuum pumping equipment, it is difficult for users to obtain. Coolant filling itself is a relatively routine and simple behavior, and it is not appropriate to require users to obtain high-value and difficult equipment.

Contents of the invention

In view of this, the present invention provides a coolant filling and emptying control method, which avoids the failure of coolant filling due to the characteristics of the electrified cooling system, resulting in insufficient cooling of the subsequent engine, or false alarm failure of the electronic water pump.

A coolant filling and emptying control method provided by the present invention includes: judging the feasibility of the coolant filling and emptying strategy; if it is judged that the coolant filling and emptying strategy can be implemented, then further confirming the coolant filling and emptying The execution intention of the strategy; if it is confirmed that the coolant filling and emptying strategy needs to be implemented, the type of water pump will be judged; then the water pump module and the temperature control module will be controlled to implement the coolant filling and emptying strategy; the water pump module and the temperature control module will complete the coolant filling and emptying strategy. After filling and emptying the strategy, it is judged whether the coolant filling and emptying strategy ends successfully.

Further, judging the feasibility of the coolant filling and emptying strategy includes: initially judging the feasibility of the coolant filling and emptying strategy; and further judging whether the coolant filling and emptying strategy is really feasible.

Further, the preliminary judgment on the feasibility of the coolant filling and emptying strategy includes: judging whether the vehicle is powered on; judging whether the engine cover is open; judging whether the expansion tank cover is open; If all the above conditions are satisfied, it is preliminarily judged that the coolant filling and emptying strategy is feasible.

Further, judging whether the coolant filling and emptying strategy is indeed feasible includes: continue to judge whether the current vehicle speed is equal to 0km/h, whether the current gear is in the P gear, whether the engine speed is equal to 0r/min, and if both are, determine whether the coolant Fill-and-empty strategies do work.

Further, confirming the execution intention of the coolant filling and emptying strategy includes: judging whether the user steps on the brake pedal with both feet and the accelerator pedal to the bottom; judging whether the user turns the steering wheel in one direction to the dead point.

Further, confirming the execution intention of the coolant filling and emptying strategy further includes: judging whether the user turns the steering wheel in another direction to the dead point.

Further, after confirming the need to implement the coolant filling and emptying strategy, it also includes: judging the type of the water pump; after the judgment of the type of the water pump is completed, judging the corresponding follow-up filling execution conditions according to the judgment result of the water pump type, and when the corresponding After filling execution conditions, control the coolant filling and emptying strategy of the water pump module and temperature control module.

Furthermore, when judging the type of water pump, if the water pump is an electronic water pump, it is necessary to further judge the current battery status: whether the battery voltage is higher than the undervoltage threshold, whether the high voltage power is higher than the low power threshold, and if so, start the coolant filling Empty strategy, if not, the filling process is over and prompt; if the water pump is a mechanical water pump, within the set time, further judge whether the engine can be successfully started, and whether the engine speed is within a reasonable range, if both, then start Coolant filling and emptying strategy, if not, the filling process ends and prompts.

Furthermore, in the implementation of the coolant filling and emptying strategy, if the water pump is an electronic water pump, it is necessary to determine whether the speed of the electronic water pump filling state and the time of the filling state reach the set value, and determine the opening of the temperature control module filling state, Whether the filling state time reaches the set value. If both reach the set value, the coolant filling and emptying strategy is completed; if the water pump is a mechanical water pump, it is necessary to judge the temperature control module filling state opening and filling state time Whether it reaches the set value, if both reach the set value, the execution of the coolant filling and emptying strategy is completed.

Further, when judging whether the coolant filling and emptying strategy is successfully completed, if the water pump is an electronic water pump, judge again the electronic water pump filling state speed, filling state time, temperature control module filling state opening, and filling state time Whether they all reach the set value, if yes, the coolant filling and emptying strategy is successfully completed; when the water pump is an electronic water pump, judge again whether the temperature control module filling opening and filling state time reach the set value, if so, Then the coolant filling and emptying strategy ends successfully.

Further, it also includes user detection, which specifically includes: the user observes the liquid level of the expansion kettle, if the liquid level drops, it is necessary to properly replenish the liquid to the appropriate level, and perform a second inspection; if the liquid level remains at the upper scale line, it means that the inside has Completely vented, the cooling system is filled with coolant, and the filling process is complete.

Compared with the prior art, the present invention has the following beneficial technical effects:

The invention provides a coolant filling and emptying control method, through information interaction between the user and the vehicle controller, the engine control system can identify the user's coolant filling behavior, and control the water pump module and temperature control module in the In this driving cycle, the demand for fast heat engine is ignored in a short period of time, and the action is performed according to the coolant filling and emptying strategy, which avoids the failure of coolant filling due to the characteristics of the electrified cooling system, resulting in insufficient cooling of the subsequent engine, or malfunction of the water pump module. In the event of a fault report, it is ensured that the user can successfully complete the refilling behavior in one operation, ensuring the safe operation of the subsequent vehicle.

Description of drawings

FIG. 1 is a flow chart of a cooling liquid filling and emptying control method according to the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated in this description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the It should not be construed as limiting the invention that a device or element must have a particular orientation, be constructed, and operate in a particular orientation.

Please refer to Fig. 1, a coolant filling and emptying control method provided by the present invention, through information interaction between the user and the vehicle controller, the EMS can identify the user's intention to fill the coolant, and control the water pump module, temperature The control module ignores the demand for fast heat engine in a short period of time in this driving cycle, and operates according to the coolant filling and emptying strategy to empty the entire cooling system to ensure that the coolant can be successfully filled, including the following steps:

S1, preliminary judgment on the feasibility of the coolant filling and emptying strategy.

When the engine is working, the water temperature is too high. When the engine is started or the water pump is working, the liquid may splash to the outside and cause burns. Therefore, it is generally recommended to refill in a cold state, so it is necessary to judge whether the water temperature is lower than the threshold; In order to discharge gas when empty, the cover of the expansion kettle needs to be opened; in order to facilitate observation and secondary filling, the engine cover also needs to be kept open. After emptying, wait for the user to further confirm the change of the liquid level and judge whether to continue the secondary filling; The emptying action will be completed by the actuator, so the user needs to power on the whole vehicle.

Based on the above reasons, EMS should make a preliminary judgment on the feasibility of the coolant filling and emptying strategy. First, judge three conditions: a. Power on), otherwise it is Bit_on=0 (the whole vehicle is powered off); b. whether the hood is open, the signal is directly read by the hood sensor, if the hood is open, then Bit_hood1=1 (the hood is open), otherwise it is Bit_hood1=0 (the hood is closed); c. whether the expansion kettle cover is open, the signal is directly read by the expansion kettle cover sensor, if the expansion kettle cover is open, then Bit_hood2=1 (the expansion kettle cover is open), otherwise Bit_hood2=0 (The lid of the expansion kettle is closed); d. Whether the current water temperature is lower than the filling threshold; if the above four conditions are met: Bit_on=1, Bit_hood1=1, Bit_hood2=1 and the previous water temperature is lower than the filling threshold, then the coolant is initially considered The filling and emptying strategy is feasible, start to enter the next step, and mark the progress status bit of the coolant filling and emptying strategy as Bit_s1=1 (preliminary judgment is feasible). During this process, if Bit_on=0 (the whole vehicle is powered off), or Bit_hood1=0 or Bit_hood2=0 (the engine cover or the expansion tank cover is closed), or the water temperature is high and exceeds the threshold, it is considered as non-cold filling , there is a risk, at this time, the status bit of the coolant filling and emptying strategy process is marked as Bit_s1=0 (the filling process ends). Since opening the hood in a cold car state is a routine maintenance action, it is not necessarily caused by adding coolant, so this step is only an initial judgment, and no prompts will be given to the instrument.

S2. In the case where the coolant filling and emptying strategy is preliminarily determined to be feasible, it is further judged whether the coolant filling and emptying strategy is indeed feasible.

Since the set user operation needs to be recognized later, but the user’s operation behavior needs to be carried out under safe conditions, it is necessary to judge whether the current vehicle speed is equal to 0km/h, that is, to ensure that the whole vehicle is static, and whether the current gear is in P gear, it must be in Avoid slipping in the parking state, and whether the engine speed is equal to 0r/min, this step needs to ensure that the follow-up behavior is absolutely safe. The above conditions are in an "AND" relationship. When all are satisfied, it is judged that the coolant filling and emptying strategy is indeed feasible. At this time, the process status of the coolant filling and emptying strategy is changed from Bit_s1=1 (preliminary judgment is feasible) to Bit_s2 = 1 (it is indeed feasible), and mark the filling display status bit as Bit_add_dis = 1. At this time, the instrument starts to display the filling status, and pops up the message "coolant emptying step in progress", and the system officially enters the filling and emptying process During the policy condition identification process, when the status bit Bit_add_dis=0 is added, the vehicle is in the normal startup state, and there is no prompt on the instrument.

S3. After judging that the coolant filling and emptying strategy is indeed feasible, the EMS needs to further confirm the implementation intention of the coolant filling and emptying strategy by identifying the set user operation.

EMS needs to conduct a series of interactions with the user, and the user performs a series of special operations, which are identified by the EMS. When these operations are identified, it is confirmed that the coolant filling and emptying strategy needs to be implemented. In order to avoid misjudgment by the system, the user's operation behavior needs to be significantly different from the normal behavior, and several steps need to be connected with each other. The more steps, the harder it is to misjudgment. There must be a corresponding time constraint between each step. If the countdown is exceeded, the default If the waiting time is too long and the user is unwilling to continue, the system automatically exits the coolant filling and emptying step and enters the normal strategy state.

Specifically, the system needs to identify the following three setting operations performed by the user:

S3.1. Determine whether the user steps on the brake pedal and the accelerator pedal to the bottom at the same time.

On the basis that the coolant filling and emptying strategy process is in the Bit_s2=1 (really feasible) state, the user can start to perform confirmation operations. According to the pre-set confirmation operation action, the user is first required to step on the brake pedal and the accelerator pedal to the bottom at the same time. At this time, the EMS judges whether the stroke of the brake pedal and the stroke of the accelerator pedal are higher than the corresponding threshold (considering that different users have different strengths) , may not be able to step on the bottom, so the threshold is set to "deep step", such as 90-95% of the stroke, not 100%), if the brake pedal stroke and the accelerator pedal stroke are higher than the corresponding threshold, it means the brake pedal Both the pedal and the accelerator pedal are stepped to the bottom, and at this time, the process state of the coolant filling and emptying strategy is changed from Bit_s2=1 (really feasible) to Bit_s3=1 (two pedals have been stepped to the bottom). Then start counting down t_count_s2 (that is, you need to leave enough time for the user, but not too long, generally set to 10-30s), and wait for the next step. For example, when the countdown t_count_s2 ends, the user has not activated the next step, or during this process, due to closing the hood, starting the engine, etc., the process status of the coolant filling and emptying strategy changes to Bit_s1=0 (preliminary judgment is not feasible), or the car appears Abnormal movement, resulting in vehicle speed not equal to 0km/h, or the gear is switched, no longer in P gear, resulting in Bit_s2 = 0 (really not feasible), at this time, mark the status bit of the filling display as Bit_add_dis = 2, indicating that the filling is quit , the instrument pops up the message "coolant emptying step failed".

S3.2, further judge whether the user turns the steering wheel left to the dead point on the basis of stepping on the two pedals to the bottom. In the state of Bit_s3=1 (two pedals have been stepped on to the bottom), the EMS needs to perform double confirmation on the user. At this time, the user is required to turn the steering wheel to the left to the dead point. Within the countdown t_count_s2 time, the EMS continues to confirm the steering wheel angle. The EMS obtains the steering wheel angle signal from the CAN network of the vehicle, and confirms that the left-turn stroke of the steering wheel is not less than the maximum left-turn angle threshold. Hit to the dead point position, but it is required to go to the left at a full 90-95% angle, so the maximum left turn angle threshold is 90-95% of the maximum left turn to dead point angle), then the progress of the coolant filling and emptying strategy The status is set to Bit_s4=1 (the steering wheel has been turned left to the dead point), and enters the countdown t_count_s3 (that is, it needs to leave enough time for the user, but it should not be too long, generally set to 10-30s), if the countdown has not yet finished Activate the next step, or due to various abnormalities, the process state of the coolant filling and emptying strategy becomes Bit_s1=0 (preliminary judgment is not feasible), or Bit_s2=0 (really not feasible), or Bit_s3=0 (double pedals are not feasible). Step to the bottom), then exit the process by default. At this time, set the process state of the coolant filling and emptying strategy to Bit_s4=0 (the steering wheel has not completed the left turn and turn to the dead point), and mark the filling display status bit as Bit_add_dis =2 (exit filling), the instrument pops up a message "coolant emptying step failed".

S3.3. On the basis that the steering wheel has been turned left to the dead point, it is further judged whether the user turns the steering wheel right to the dead point.

As mentioned above, when the progress state of the coolant filling and emptying strategy is Bit_s4=1 (the steering wheel has been turned left to the dead point), the EMS continues to judge whether to enter the next step. At this time, the user holds the steering wheel, Turn right until the steering wheel reaches the dead point. At this time, the EMS interacts with the steering wheel angle signal from the CAN network of the vehicle. After confirming that the steering wheel’s right-turning stroke is not less than the maximum right-turning angle threshold, the coolant will be filled and drained. The state is set to Bit_s5=1 (steering wheel has been turned right to the dead point), and now enters the countdown t_count_s4 (that is, it needs to leave enough time for the user, but it should not be too long, generally set to 10-30s), if the countdown ends When the next step has not been activated, or due to any abnormality, the process status of the coolant filling and emptying strategy changes to Bit_s1=0 (preliminary judgment is not feasible), or Bit_s2=0 (really not feasible), or Bit_s3=0 (two-pedal not stepping on the bottom), or Bit_s4=0 (the steering wheel has not completed the left turn and hits to the end dead point), then the process state of the coolant filling and emptying strategy is set to Bit_s5=0 (the steering wheel has not completed the right turn and hits the end to the end) point), mark the filling display status bit as Bit_add_dis=2 (exit filling), and the instrument pops up the message "coolant emptying step failed".

S4. On the basis of further confirming the implementation of the coolant filling and emptying strategy, the EMS needs to judge the type of the water pump.

When the process state of the coolant filling and emptying strategy is Bit_s5=1 (the steering wheel has been turned right to the dead point), the EMS has fully confirmed the user's behavior and needs to implement the coolant filling and emptying strategy, then The water pump module and the temperature control module can start to implement the coolant filling and emptying strategy. However, due to the variety of engine solutions, there are various situations such as mechanical water pump + temperature control module, electronic water pump + thermostat, and electronic water pump + temperature control module. The coolant filling and emptying strategy first requires the water pump to work to stir and mix the air and coolant in the system evenly, and transport the air to the position of the expansion kettle. Since the expansion kettle is opened during this period, it is directly connected to the atmosphere, so Internal gas can be exhausted. In the case of an electronic water pump, this is the preferred solution since its speed is decoupled from the engine and can be operated without the engine starting. In the case of a mechanical water pump, since its speed is coupled to the engine, the engine must be started for operation. However, the electronic water pump needs to directly consume the energy of the battery. If the vehicle has not been moved for a long time and the battery is running low, this operation may cause the subsequent engine to fail to start. Therefore, the engine must be started for refilling and drainage when the battery is low null. Therefore, before the electronic water pump and the temperature control module execute the coolant filling and emptying strategy, the EMS is in the state of Bit_s5=1 (the steering wheel has completed the right turn and turned to the end dead point) in the progress state of the coolant filling and emptying strategy. It is also necessary to judge the type of water pump.

The EMS reads the status of the engine main cooling water pump preset in the early stage of design, and judges whether it is an electronic water pump or a mechanical water pump. If it is an electronic water pump, it presets CWBit_ewp=1 (electronic water pump), and if it is a mechanical water pump, it presets CWBit_ewp=0 ( mechanical water pump). When CWBit_ewp=1 (electronic water pump), and the progress status of the coolant filling and emptying strategy is Bit_s5=1 (the steering wheel has been turned right to the dead point), the EMS needs to judge the current battery status. Only the 12V battery in the system supplies power to the electronic water pump, so when the battery voltage is higher than the undervoltage threshold, it will directly enter the coolant filling and emptying execution process. For hybrid models, since the 12V battery is connected to the high-voltage battery, the voltage of the 12V battery needs to be higher than the undervoltage threshold, and the high-voltage electric power is higher than the low-battery threshold; therefore, the judging conditions of the battery status need to be preset according to the vehicle model . If the power condition is judged to be yes, that is, the power is sufficient to support the electronic water pump, the system can enter the coolant filling and emptying strategy, and the EMS activates the electronic water pump and temperature control module in the cooling system, and sets the filling working state to Bit_vac1, indicating that Start the coolant filling and emptying strategy, and control the electronic water pump and temperature control module to perform the filling action. If the battery voltage of the conventional model is not higher than the undervoltage threshold, or the hybrid model cannot meet the voltage and SOC of the 12V battery, the EMS waits to enter the next step, and the next step is the same as CWBit_ewp=0 (mechanical water pump) and Bit_s5=1 (steering wheel is turned on). Same when completing the right turn and hitting to the end dead point) state.

When CWBit_ewp=0 (mechanical water pump), and Bit_s5=1 (steering wheel has been turned right to the dead point), the EMS still needs to judge whether to enter the next step. At this time, the EMS system enters the countdown t_count_s5, and the user needs to complete the countdown before the countdown ends. , Ignite and start the engine (It takes a certain process to start the engine to stabilize it at the idle speed level, and it usually takes 3-5s for a single time. To ensure that there are 2-3 times of start-up time, to ensure a successful start, the countdown t_count_s5 is generally set to 20- 30s). During this process, the EMS continues to judge whether the engine speed is within a reasonable range. If the engine speed is within the range of the idle speed threshold ±100r/min before the countdown ends (the idle speed generally fluctuates), the coolant will be filled and drained. The state is set to Bit_s6=1 (the judgment of the water pump type is completed), and the filling work state is set to Bit_vac=1 (the coolant filling and emptying strategy is started), and sent to the electronic water pump and the temperature control module control module. During this process, if the progress status of the coolant filling and emptying strategy changes to Bit_s1=0 (preliminary judgment is not feasible), or Bit_s2=0 (really not feasible), or Bit_s3=0 (two pedals are not pressed to the bottom) or Bit_s4= 0 (steering wheel has not turned left to the dead point), or Bit_s5=0 (steering wheel has not turned right to the dead point), or Bit_s6=0 at the end of the countdown (the judgment of the water pump has not been completed), then the coolant will be added Note: If the display status bit is set to Bit_add_dis=2 (exit filling), the instrument will pop up the message "coolant emptying step failed".

S5, on the basis of completing the determination of the type of the water pump, the water pump module and the temperature control module execute a coolant filling and emptying strategy. Since the actual emptying process generally requires the water pump to work at an appropriate speed (the speed of the electronic water pump can be adjusted, and the speed of the mechanical water pump is fixed considering the idle speed of the engine) to drive the coolant to flow. location, or other locations that can guarantee system-wide connectivity. Therefore, if the engine is designed with an electronic water pump, when the preset CWBit_ewp=1 (electronic water pump), when the electronic water pump control module and the temperature control module control module receive Bit_vac=1 (starting the coolant filling and emptying strategy), they enter the corresponding In the working state of coolant filling, the electronic water pump queries the calibrated filling state speed and filling state time, executes the calibrated filling state speed as the target speed, and lasts for a long time; the temperature control module control module queries the calibrated filling state opening, Filling state time, and start to calibrate the filling state opening as the target opening, and last for a long time. When the electronic water pump is at the set speed and the filling state time is satisfied, it sends a signal ewp_finish=1 (the electronic water pump is completed), otherwise ewp_finish=0 (the electronic water pump is not completed); the temperature control module works at the set opening When the duration meets the filling state time, a signal TMM_finish=1 is sent (the execution of the temperature control module is completed), otherwise TMM_finish=0 (the execution of the temperature control module is not completed).

If the engine is designed as a mechanical water pump, when the preset CWBit_ewp=0 (mechanical water pump), the mechanical water pump is free to work with the ignition of the engine, and only the temperature control module performs corresponding actions internally. When it is at the set opening, the work continues When the time meets the filling state time, send a signal TMM_finish=1 (the execution of the temperature control module is completed), otherwise TMM_finish=0 (the execution of the temperature control module is not completed).

In the above steps, in a system with an electronic water pump, filling and emptying can be carried out without starting the engine, and there is no risk. However, if the battery is low or the system is a mechanical water pump system, the engine needs to be started. During the empty process, the idle speed must be kept at the same place. If the engine speed exceeds the idle speed threshold ±100r/min, the user may have performed a flameout operation, or stepped on the accelerator to make the engine reach a high idle speed. During this process, in order to avoid accidents, the coolant The process status of the filling and emptying strategy is set to Bit_s6=0 (the judgment of the water pump type is not completed), the filling work status bit is set to Bit_vac=0, which means that the coolant filling and emptying strategy is not started, and the filling display status bit is set to Bit_add_dis=2 (exit filling), the instrument pops up the message "coolant emptying step failed".

S6, on the basis that the water pump module and the temperature control module have completed the implementation of the coolant filling and emptying strategy, it is judged whether the coolant filling and emptying strategy is successfully completed. If the powertrain is designed with an electronic water pump, when the preset CWBit_ewp=1 (electronic water pump), the EMS judges whether the electronic water pump execution completion signal ewp_finish and the temperature control module execution completion signal TMM_finish are equal to 1, if ewp_finish=1 (electronic water pump execution completion ) and TMM_finish=1 (the execution of the temperature control module is completed), indicating that the filling and emptying is completed. At this time, the process status of the coolant filling and emptying strategy is set to Bit_s7=1 (successfully completed), otherwise Bit_s7=0 (unsuccessfully completed ); if the preset CWBit_ewp=0 (mechanical water pump), the EMS only judges whether the temperature control module execution completion signal TMM_finish is equal to 1, if TMM_finish=1 (temperature control module execution is completed), indicating that the filling and emptying is completed, at this time The process status of the coolant filling and emptying strategy is set to Bit_s7=1 (successfully completed), otherwise Bit_s7=0 (unsuccessfully completed).

S7, after the coolant filling and emptying strategy is successfully completed, the user still needs to perform detection.

After successfully filling and emptying, the user needs to be reminded. After this step, the user observes the liquid level of the expansion kettle. If the liquid level drops, it means that there is indeed air exhausted inside. examine. If the liquid level remains at the upper scale line, it means that the interior has been completely exhausted, the cooling system is filled with coolant, and the filling process is over. At this time, the expansion tank cover can be covered, and the cabin cover can be closed to enter the normal state.

As mentioned above, during the above full emptying process, if the filling display status bit is Bit_add_dis=0 (normal state), the filling and emptying identification will not be performed at this time, and the instrument will not make any special prompts. When the filling display status When the bit is Bit_add_dis=1 (the system formally enters the identification process of filling and emptying strategy conditions), it means that during the emptying judgment process, the instrument prompts "coolant emptying step in progress". When the filling display status bit is Bit_add_dis=2 (exit filling), it means that a certain step in the process failed, and the indicator will prompt "coolant emptying step failed" for a long time. After the countdown ends, the filling display status bit Change to Bit_add_dis=0 (normal state), restore the normal state again, and wait for the user operation to start again. If and only when the EMS sets the process state of the coolant filling and emptying strategy to Bit_s7=1 (successful end), it means that the filling is successful. When Bit_s7=1 (successful end), Bit_add_dis=0 (normal state), restore regular state. When Bit_s7=1 (successfully completed), the instrument will prompt "coolant emptying process completed" and last for a long time. After the duration is over, the prompt disappears and the whole process is over.

In summary, the present invention provides a coolant filling and emptying control method, through the information interaction between the user and the vehicle controller, the engine control system can recognize the user's coolant filling behavior, and control the water pump module , The temperature control module ignores the demand for rapid heat-up in the short period of this driving cycle, and operates according to the coolant filling and emptying strategy, avoiding the failure of coolant filling due to the characteristics of the electrified cooling system, resulting in insufficient cooling of the subsequent engine , or the water pump module falsely reports a failure, to ensure that the user can successfully complete the refilling behavior in one operation, and to ensure the safety of the subsequent vehicle operation.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A coolant filling and emptying control method, characterized in that it comprises:

Judge the feasibility of the coolant filling and emptying strategy;

If it is judged that the coolant filling and emptying strategy can be implemented, further confirm the implementation intention of the coolant filling and emptying strategy;

If it is confirmed that the coolant filling and emptying strategy needs to be implemented, the water pump module and the temperature control module are controlled to implement the coolant filling and emptying strategy;

After the water pump module and the temperature control module complete the coolant filling and emptying strategy, it is judged whether the coolant filling and emptying strategy is successfully completed.
The cooling liquid filling and emptying control method according to claim 1, wherein judging the feasibility of the cooling liquid filling and emptying strategy comprises:

Preliminary judgment on the feasibility of the coolant filling and emptying strategy;

Further judge whether the coolant filling and emptying strategy is really feasible.
The cooling liquid filling and emptying control method according to claim 2, wherein the preliminary judgment of the feasibility of the cooling liquid filling and emptying strategy includes:

Determine whether the vehicle is powered on;

Determine whether the hood is open;

Determine whether the lid of the expansion tank is open;

Determine whether the current water temperature is lower than the filling threshold;

If the above four conditions are met, it is preliminarily judged that the coolant filling and emptying strategy is feasible.
The cooling liquid filling and emptying control method according to claim 2, wherein further judging whether the cooling liquid filling and emptying strategy is indeed feasible comprises: judging whether the current vehicle speed is equal to 0 km/h, and whether the current gear is in the P gear , Whether the engine speed is equal to 0r/min, if both, it is determined that the coolant filling and emptying strategy is indeed feasible.
The cooling liquid filling and emptying control method according to claim 1, wherein confirming the implementation intention of the cooling liquid filling and emptying strategy comprises:

Determine whether the user steps on the brake pedal and the accelerator pedal to the bottom at the same time;

Determine whether the user turns the steering wheel to the dead point in one direction.
The method for controlling filling and emptying of the coolant according to claim 5, wherein confirming the execution intention of the strategy for filling and emptying the coolant further comprises: judging whether the user turns the steering wheel in another direction to a dead point.
The cooling liquid filling and emptying control method according to claim 1, further comprising:

To judge the type of water pump;

After the water pump type judgment is completed, the corresponding follow-up filling execution conditions are judged according to the water pump type judgment results, and the cooling liquid filling and emptying strategies of the water pump module and the temperature control module are controlled after the corresponding filling execution conditions are met.
The cooling liquid filling and emptying control method according to claim 7, wherein when judging the type of the water pump, if the water pump is an electronic water pump, it is necessary to further judge the current battery state: whether the battery voltage is higher than the undervoltage threshold, high voltage Whether the battery level is higher than the low battery threshold, if so, start the coolant filling and emptying strategy, if not, the filling process is over and prompt;

If the water pump is a mechanical water pump, within the set time, further judge whether the engine can be successfully started, and whether the engine speed is within a reasonable range, if both, start the coolant filling and emptying strategy, if not, the filling process End and prompt.
The cooling liquid filling and emptying control method according to claim 1, characterized in that, in executing the cooling liquid filling and emptying strategy, if the water pump is an electronic water pump, it is necessary to judge the electronic water pump filling state speed and filling state time Whether it reaches the set value, and judge whether the opening of the temperature control module filling state and the time of filling state reach the set value. If both reach the set value, the execution of the coolant filling and emptying strategy is completed;

If the water pump is a mechanical water pump, it is necessary to judge whether the opening of the temperature control module in the filling state and the time in the filling state reach the set value. If both reach the set value, the coolant filling and emptying strategy is executed.
The cooling liquid filling and emptying control method according to claim 1, wherein when judging whether the cooling liquid filling and emptying strategy is successfully completed, if the water pump is an electronic water pump, it is judged again that the electronic water pump is filled with a speed, a Whether the filling state time, temperature control module filling state opening, and filling state time all reach the set value, if so, the coolant filling and emptying strategy ends successfully;

When the water pump is an electronic water pump, it is judged again whether the filling opening of the temperature control module and the filling state time have reached the set value, and if so, the coolant filling and emptying strategy is successfully completed.
The cooling liquid filling and emptying control method according to claim 1, further comprising user detection, specifically comprising:

The user observes the liquid level of the expansion kettle. If the liquid level drops, it is necessary to properly replenish the liquid to the appropriate level and perform a second inspection; if the liquid level remains at the upper scale line, it means that the interior has been completely exhausted and the cooling system is filled with coolant. The filling process is over.