CN116181475A

CN116181475A - Cooling liquid filling and emptying control method

Info

Publication number: CN116181475A
Application number: CN202111423045.6A
Authority: CN
Inventors: 林承伯; 乔艳菊; 吴广权; 张旭; 丘胜强; 何炎迎
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2023-05-30
Also published as: WO2023093540A1

Abstract

The invention discloses a control method for filling and emptying cooling liquid, which comprises the steps of enabling an EMS to identify the action of filling the cooling liquid by a user through information interaction between the user and a vehicle controller, controlling a water pump module and a temperature control module to ignore the requirement of a quick heat engine in a short time of the driving cycle, performing actions according to a cooling liquid filling and emptying strategy, and ensuring that the cooling liquid can be successfully filled. The invention avoids the situation that the filling of the cooling liquid fails due to the characteristics of an electrified cooling system, so that the subsequent engine is not cooled enough or the electronic water pump misreports the fault.

Description

Cooling liquid filling and emptying control method

Technical Field

The invention relates to the technical field of engines, in particular to a cooling liquid filling and emptying control method.

Background

At present, a cooling system scheme used by the whole vehicle in the market is usually a mechanical water pump and a thermostat, wherein the thermostat is used for realizing the adjustment of two branches of the large circulation and the bypass small circulation of the radiator. The thermostat is generally designed to gradually open a large cycle when the temperature reaches 80-90 ℃ so that the flow enters the radiator for heat dissipation. The mechanical water pump and the thermostat in the conventional scheme cannot be actively controlled, but as the thermostat at least can ensure that the small circulation is always on in a cold state, the structure of the full cooling system is communicated, and when cooling liquid is filled, the cooling liquid can flow to all positions of the system. In addition, the mechanical water pump is dragged by the engine, and the engine working mechanical water pump works, so that the engine working mechanical water pump can not stop working due to the fact that water is lack in the system or bubbles exist locally and dry in a short time.

Therefore, when leaving the factory, the producer is to the system and take out the vacuum filling, or after selling, when the user is by oneself to fill the coolant liquid, all need not special operation, only need after filling, start the engine 3-5 minutes, stir the coolant liquid through mechanical water pump, let inside air of system, liquid intensive mixing, then circulate to the expansion kettle after, discharge from the expansion kettle.

However, after the cooling system is electrified, a series of problems occur after the mechanical water pump and the thermostat are replaced by the electronic water pump and the temperature control module (the electric control ball valve). For example, in order to realize a rapid heat engine during cold start of an engine, an electronic water pump is often not operated or only operated in a small amount, and cannot fully stir cooling liquid and air. The upper half part of the volute water chamber is difficult to fill water, namely, air cannot be completely discharged in an initial state, at the moment, the electronic water pump is forcibly started, the electronic water pump cannot reach due power at the same rotating speed because the water chamber is not fully loaded, and the electronic water pump is easily judged to be dry by the controller, so that the work is forcibly stopped. In addition, the temperature control module generally adjusts the opening to the minimum value and even completely closes the opening in the cold starting process of the engine, and completely closes the small circulation, at the moment, the cooling system branch of the engine is forcibly cut off, cooling liquid cannot flow through each area after entering the engine, the liquid level is fully filled in the expansion kettle, but the inside of the actual engine is not fully filled at all, and phenomena such as insufficient cooling and the like easily occur in the subsequent working process.

The common solution to the problems in the market is that the system is vacuumized and filled, after the system air is completely pumped out, the cooling liquid is injected, and at the moment, the cooling liquid can automatically flow to each position of the whole system under the action of pressure difference, each interval is filled, and specific occasions and tools are needed for vacuumization. However, the bernoulli effect is generally used for vacuumizing, and high-pressure gas is needed first, when the flow rate of the gas is high, the internal static pressure of the gas is reduced, and at the moment, the pressure difference between the gas and the inside of the cooling system occurs, so that the air in the system is automatically sucked out, and the vacuum in the system is manufactured. However, the high-pressure gas or the equipment corresponding to the vacuumizing is difficult to obtain by a user, the cooling liquid filling is a more conventional and simple action, and the equipment with high value and high difficulty is not suitable for the user.

Disclosure of Invention

In view of the above, the invention provides a control method for filling and emptying cooling liquid, which avoids the situation that the filling of the cooling liquid fails due to the characteristics of an electrified cooling system, so that the cooling of a subsequent engine is insufficient, or an electronic water pump misreports a fault.

The invention provides a cooling liquid filling and emptying control method, which comprises the following steps: judging the feasibility of a cooling liquid filling and emptying strategy; if the cooling liquid filling and emptying strategy can be executed, further confirming the execution intention of the cooling liquid filling and emptying strategy; if the cooling liquid filling and emptying strategy is confirmed to be required to be executed, judging the type of the water pump; the water pump module and the temperature control module are controlled to execute a cooling liquid filling and emptying strategy; and after the water pump module and the temperature control module execute the cooling liquid filling and emptying strategy, judging whether the cooling liquid filling and emptying strategy is finished successfully.

Further, determining the feasibility of the coolant fill and drain strategy includes: preliminarily judging the feasibility of a cooling liquid filling and emptying strategy; further determining whether a coolant fill and drain strategy is indeed viable.

Further, the preliminary determination of the feasibility of the coolant fill and drain strategy includes: judging whether the whole vehicle is electrified; judging whether the engine cover is opened or not; judging whether the expansion kettle cover is opened or not; judging whether the current water temperature is lower than a filling threshold value or not; if all the four conditions are met, the cooling liquid filling and emptying strategy is judged to be feasible preliminarily.

Further, determining whether a coolant fill and drain strategy is truly viable includes: and continuously judging whether the current vehicle speed is equal to 0km/h, whether the current gear is in the P gear and whether the engine speed is equal to 0r/min, and if so, judging that the cooling liquid filling and emptying strategy is truly feasible.

Further, confirming the intent of execution of the coolant fill and drain strategy includes: judging whether a user simultaneously steps on a brake pedal and an accelerator pedal to the bottom or not; it is determined whether the user makes a turn of the steering wheel in one direction to the dead end.

Further, confirming the execution intention of the coolant filling and emptying strategy further includes: it is determined whether the user has paid the steering wheel to the dead end in the other direction.

Further, after confirming that the coolant filling and emptying strategy needs to be executed, the method further comprises the following steps: judging the type of the water pump; and after the water pump type judgment is finished, corresponding follow-up filling execution condition judgment is carried out according to the water pump type judgment result, and the cooling liquid filling and emptying strategy of the water pump module and the temperature control module is controlled after the corresponding filling execution condition is met.

Further, when judging the type of the water pump, if the water pump is an electronic water pump, the current battery state needs to be further judged: whether the battery voltage is higher than an undervoltage threshold value and whether the high-voltage electric quantity is higher than a low-electric quantity threshold value, if so, starting a cooling liquid filling and emptying strategy, and if not, ending and prompting the filling process; if the water pump is a mechanical water pump, whether the engine can be started successfully or not and whether the engine rotating speed is in a reasonable range or not are further judged in a set time, if so, a cooling liquid filling and emptying strategy is started, and if not, the filling process is ended and prompted.

Further, in executing the cooling liquid filling and emptying strategy, if the water pump is an electronic water pump, judging whether the filling state rotating speed and the filling state time of the electronic water pump reach set values, judging whether the filling state opening degree and the filling state time of the temperature control module reach the set values, and if the filling state opening degree and the filling state time reach the set values, executing the cooling liquid filling and emptying strategy; if the water pump is a mechanical water pump, judging whether the opening degree of the filling state of the temperature control module and the filling state time reach set values, and if so, completing the execution of the cooling liquid filling and emptying strategy.

Further, judging whether the cooling liquid filling and emptying strategy is successfully finished, if the water pump is an electronic water pump, judging whether the filling state rotating speed and the filling state time of the electronic water pump, the filling state opening degree and the filling state time of the temperature control module reach set values again, and if so, ending the cooling liquid filling and emptying strategy successfully; when the water pump is an electronic water pump, judging whether the filling opening degree and the filling state time of the temperature control module reach set values again, and if so, ending the cooling liquid filling and emptying strategy successfully.

Further, the method also comprises user detection, and specifically comprises the following steps: the user observes the liquid level of the expansion kettle, if the liquid level is reduced, the liquid needs to be properly supplemented to a proper liquid level, and secondary inspection is carried out; if the liquid level is still kept at the upper scale mark, the internal part is completely exhausted, the cooling system is filled with cooling liquid, and the filling process is finished.

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

according to the cooling liquid filling and emptying control method provided by the invention, through information interaction between a user and the whole vehicle controller, the engine control system recognizes the cooling liquid filling action of the user, and controls the water pump module and the temperature control module to ignore the rapid heat engine requirement in a short time of the driving cycle, and the cooling liquid filling and emptying control method acts according to the cooling liquid filling and emptying strategy, so that the situation that the cooling liquid filling fails due to the characteristics of an electrified cooling system, the cooling of a subsequent engine is insufficient, or the water pump module misreports the fault is avoided, the user can finish the filling action successfully by one-time operation, and the running safety of the subsequent whole vehicle is ensured.

Drawings

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

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated in the present description is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1, according to the control method for filling and emptying cooling liquid provided by the invention, through information interaction between a user and a whole vehicle controller, an EMS identifies the intention of the user to fill cooling liquid, and controls a water pump module and a temperature control module to ignore the requirement of a quick heat engine in a short time of the driving cycle, and the control method performs actions according to a cooling liquid filling and emptying strategy to empty the whole cooling system, so as to ensure that the cooling liquid can be successfully filled, and comprises the following steps:

s1, primarily judging the feasibility of a cooling liquid filling and emptying strategy.

Because the water temperature is too high when the engine works, and liquid can splash to the outside to cause scalding when the engine is started or the water pump works, filling is generally recommended to be carried out in a cold state, and therefore whether the water temperature is lower than a threshold value or not needs to be judged; in order to exhaust the gas during emptying, the expansion kettle cover needs to be opened; in order to facilitate observation and secondary filling, the engine cover is also required to be kept open, and after the engine cover is emptied, a user further confirms the liquid level change and judges whether to continue secondary filling; the emptying operation is completed by the actuator, so that the user needs to power up the whole vehicle.

Based on the above reasons, the EMS needs to primarily determine the feasibility of the cooling liquid filling and emptying strategy, and first determines three conditions: a. whether the whole vehicle is electrified or not, if the whole vehicle is in an electrified and non-started state, bit_on=1 (the whole vehicle is electrified), otherwise, bit_on=0 (the whole vehicle is electrified); b. if the hood is open, the signal is directly read by the hood sensor, if the hood is open, bit_hood=1 (the hood is open), otherwise bit_hood=0 (the hood is closed); c. if the expansion kettle cover is opened, the sensor directly reads the signal, if the expansion kettle cover is opened, the bit_hood=1 (the expansion kettle cover is opened), otherwise, the signal is bit_hood=0 (the expansion kettle cover is closed); d. whether the current water temperature is lower than a filling threshold; the four conditions are satisfied as follows: bit_on=1, bit_hood=1, and bit_hood 2=1, and the previous water temperature is lower than the filling threshold, the coolant filling and draining strategy is primarily considered feasible, the next step is started, and the process state Bit of the coolant filling and draining strategy is marked as bit_s1=1 (primary judgment is feasible). In this process, if bit_on=0 (the whole vehicle is powered down), bit_hood=0 or bit_hood=0 (the engine cover or the expansion kettle cover is closed), or the water temperature is higher, if the water temperature exceeds the threshold value, the process is considered to be non-cold filling, and there is a risk, and at this time, the state Bit of the process of the cooling liquid filling and emptying strategy is marked as bit_s1=0 (the filling process is finished). Because the engine cover is opened in the cold state in the conventional maintenance behavior, the engine cover is not necessarily caused by filling the cooling liquid, the step is only carried out in an initial stage, and no prompt is carried out on the instrument.

And S2, further judging whether the cooling liquid filling and emptying strategy is actually feasible or not under the condition that the cooling liquid filling and emptying strategy is preliminarily judged to be feasible.

Since the user operation is required to be identified and set later, but the operation behavior of the user is required to be performed under a safe condition, whether the current vehicle speed is equal to 0km/h or not needs to be judged, namely, whether the whole vehicle is static or not is ensured, whether the current gear is in a P gear or not, the vehicle is in a parking state and is prevented from slipping backwards, and whether the rotating speed of the engine is equal to 0r/min or not needs to be ensured, so that the follow-up behavior is absolutely safe. When all the conditions are in the AND relationship, namely judging that the cooling liquid filling and emptying strategy is actually feasible, changing the progress state of the cooling liquid filling and emptying strategy from bit_s1=1 (the preliminary judgment is feasible) to bit_s2=1 (the preliminary judgment is actually feasible), marking the filling display state Bit as bit_add_dis=1, at the moment, the instrument starts to display the filling state, and popping up the information of 'the cooling liquid emptying step in progress', the system formally enters the condition identification process of the filling and emptying strategy, the filling display state bit_add_dis=0 is the normal starting state of the vehicle, and no prompt is given to the instrument.

And S3, after judging that the cooling liquid filling and emptying strategy is actually feasible, the EMS further confirms the execution intention of the cooling liquid filling and emptying strategy by identifying the set user operation.

The EMS may be configured to perform a series of specific operations by the user through a series of interactions with the user, and to identify the operations by the EMS, and when identified, to confirm that a coolant fill and drain strategy is to be performed. In order to avoid misjudgment of the system, the operation behaviors of the user are obviously different from the conventional behaviors, a plurality of steps are needed to be mutually connected, misjudgment is difficult to be carried out when the steps are more, corresponding time constraint is needed between each step, the default waiting time is too long when the countdown is exceeded, the user is not willing to continue, and the system automatically exits from the step of filling and emptying the cooling liquid and shifts to the conventional strategy state.

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

and S3.1, judging whether a user simultaneously steps on the brake pedal and the accelerator pedal to the bottom.

The user may start the confirmation operation on the basis that the coolant filling and draining strategy process is in the bit_s2=1 (indeed feasible) state. According to the preset confirmation operation action, the user is required to simultaneously step on the brake pedal and the accelerator pedal to the bottom at first, at this time, the EMS judges whether the brake pedal stroke and the accelerator pedal stroke are higher than the corresponding thresholds (considering that different user forces are different, the user cannot necessarily step on the bottom, so the thresholds are all set to be "deep stepping", for example, 90-95% of the stroke is not 100%), if the brake pedal stroke and the accelerator pedal stroke are higher than the corresponding thresholds, the brake pedal and the accelerator pedal are indicated to be both stepped on the bottom, and at this time, the process state of the cooling liquid filling and emptying strategy is changed from bit_s2=1 (truly feasible) to bit_s3=1 (double pedals are already stepped on the bottom). Thereafter, a count down time t_count_s2 is started (i.e. the user needs to be left with time and cannot be excessively long, typically set to 10-30 s), and the next step is waited. If the user has not activated the next step when the countdown t_count_s2 ends, or the process state of the cooling liquid filling and emptying strategy is changed into bit_s1=0 (preliminary judgment is not feasible) or the automobile is abnormal, the speed is not equal to 0km/h, or the gear is switched and is not in the P gear any more, the bit_s2=0 (indeed not feasible) is caused, at the moment, the filling display state Bit is marked as bit_add_dis=2, the filling is stopped, and the instrument popup information "the cooling liquid emptying step fails".

And S3.2, further judging whether the user turns the steering wheel left to the dead point or not on the basis of finishing stepping the double pedals to the bottom.

In the state of bit_s3=1 (the double pedal has been stepped to the bottom), the EMS needs to double confirm the user, at which point the user is required to turn the steering wheel left to the dead center. And continuously confirming the steering wheel angle in the countdown time t_countdown_s2, wherein the EMS acquires a steering wheel angle signal from the whole vehicle CAN network, confirms that the steering wheel left-turn stroke is not smaller than a left-turn maximum angle threshold (error does not occur when a user acts and is not required to reach a dead point position, but 90-95% of the angle is required to be fully filled to the left, so that the left-turn maximum angle threshold is 90-95% of the maximum left-turn dead point angle), the process state of the cooling liquid filling and draining strategy is set to be bit_s4=1 (the steering wheel is completely left-turned to the dead point position), the countdown time t_countdown_s3 (namely, the time is required to be left for a user and is not longer, and is generally set to be 10-30 s) is entered, if the countdown time is ended, the next step is not activated, or the process state of the cooling liquid filling and draining strategy is changed to be bit_s1=0 (initial judgment is not feasible), or bit_s2=0 (true) is not met, or bit_s3=0=0 is not met (bit_s2=0 is not met), and the step-out state is not met until the step-down time is failed to be reached, and the step state is not is reached.

And S3.3, further judging whether the user turns the steering wheel right to the dead point or not on the basis that the steering wheel finishes turning left to the dead point.

As described above, in the state where the progress state of the cooling liquid filling and draining strategy is bit_s4=1 (the steering wheel has completed making a left turn to dead point), the EMS continues to determine whether to enter the next step, at this time, the user holds the steering wheel, makes a right turn until the steering wheel makes a dead point, at this time, the EMS interactively obtains a steering wheel angle signal from the whole vehicle CAN network, confirms that the steering wheel right turn travel is not less than the right turn maximum angle threshold, sets the progress state of the cooling liquid filling and draining strategy to bit_s5=1 (the steering wheel has completed making a right turn to dead point), enters countdown t_counts4 (i.e. needs to make a left turn to the dead point) and is not longer, and is generally set to 10-30 s), if the countdown is finished, the next step is not activated, or the progress state of the cooling liquid filling and draining strategy becomes bit_s1=0 (preliminary determination is not possible), or bit_s2=0 (indeed not possible), or bit_s3=0 (bit_s4 is not finished to be stepped to the bottom dead point) is a cooling liquid filling and draining strategy is not completed (bit_s2=4 is set to the left turn_dead point is not completed) and the progress state of the cooling liquid filling and draining strategy is set to be the bit_s4 is not completed (is completely_is set to the largest (is no step is actually step is performed).

S4, on the basis of further confirming the execution of the cooling liquid filling and emptying strategy, the EMS needs to judge the type of the water pump.

In the state that the progress state of the cooling liquid filling and draining strategy is bit_s5=1 (the steering wheel is completely turned right to the dead point), the EMS completely confirms the user behavior, and the cooling liquid filling and draining strategy needs to be executed, so that the water pump module and the temperature control module can start executing the cooling liquid filling and draining strategy. However, the engine has various schemes, such as a mechanical water pump, a temperature control module, an electronic water pump, a thermostat, an electronic water pump, a temperature control module and the like. The cooling liquid filling and emptying strategy firstly needs a water pump to work, the air and the cooling liquid in the system are uniformly mixed and transported to the position of the expansion kettle, and the expansion kettle is opened during the period and is directly communicated with the atmosphere, so that the internal gas can be discharged. In the case of an electronic water pump, since its rotational speed is decoupled from the engine, the operation can be performed without the need for engine start-up, which is a preferred option. In the case of a mechanical water pump, the engine side executable operation must be started due to its rotational speed coupled to the engine. However, the electronic water pump needs to directly consume the energy of the storage battery, if the whole vehicle is not moved for a long time, the operation is performed under the state of power shortage of the storage battery, which may cause that the subsequent engine cannot be started, so that the engine must be started for filling and emptying under the condition of low electric quantity. Therefore, before the electronic water pump and the temperature control module execute the cooling liquid filling and draining strategy, the EMS further needs to determine the type of the water pump in a state that the progress state of the cooling liquid filling and draining strategy is bit_s5=1 (the steering wheel has completed turning right to the dead point).

The EMS reads the state of the main cooling water pump of the engine preset in advance in the initial design stage, judges the main cooling water pump to be an electronic water pump or a mechanical water pump, if the main cooling water pump is the electronic water pump, the main cooling water pump is preset with CWBit_ ewp =1 (the electronic water pump), and if the main cooling water pump is the mechanical water pump, the main cooling water pump is preset with CWBit_ ewp =0 (the mechanical water pump). When cwbit_ ewp =1 (electronic water pump) and the progress status of the coolant filling and draining strategy is bit_s5=1 (steering wheel has completed turning right to dead point), the EMS also needs to determine the current battery status, and only 12V storage battery is used to supply power to the electronic water pump in the conventional fuel vehicle type system, so when the battery voltage is higher than the under-voltage threshold, the coolant filling and draining execution progress is directly entered. For the hybrid motor vehicle type, as the 12V storage battery is communicated with the high-voltage battery, the voltage of the 12V battery is required to be higher than an undervoltage threshold value, and the voltage of the high-voltage battery is required to be higher than a low-power threshold value; therefore, it is necessary to set the determination condition of the battery state in advance according to the vehicle type. If the electric quantity condition is judged to be yes, namely the electric quantity is enough to support the operation of the electronic water pump, the system can enter a cooling liquid filling and emptying strategy, the EMS activates the electronic water pump and the temperature control module in the cooling system, the filling operation state is set to be bit_vac1, the cooling liquid filling and emptying strategy is started, and the electronic water pump and the temperature control module are controlled to execute filling actions. If the conventional vehicle battery voltage is not higher than the undervoltage threshold, or the hybrid vehicle cannot meet the voltage and SOC conditions of the 12V battery, the EMS waits for the next step, which is the same as in the cwbit_ ewp =0 (mechanical water pump) and bit_s5=1 (steering wheel has completed turning right to dead end) state.

When cwbit_ ewp =0 (mechanical water pump), and bit_s5=1 (steering wheel has completed turning right to dead end), the EMS also needs to determine whether to enter the next step, at this time, the EMS system enters the countdown t_count_s5, and before the countdown is completed, the user needs to start the engine by igniting (starting the engine to stabilize at idle level requires a certain process, typically 3-5s for a single time, to ensure that 2-3 start times are left to ensure successful start, and the countdown t_count_s5 is typically set to 20-30 s). The EMS continuously judges whether the engine speed is within a reasonable range in the process, if the engine speed is within an idling threshold value ±100deg.r/min (the idling generally has fluctuation) before the countdown is finished, the progress state of the coolant filling and emptying strategy is set to bit_s6=1 (the water pump type judgment is completed), the filling working state is set to bit_vac=1 (the coolant filling and emptying strategy is started), and the coolant filling and emptying strategy is sent to the electronic water pump and the temperature control module. In this process, if the progress status of the coolant filling and draining strategy becomes bit_s1=0 (preliminary determination is not possible) or bit_s2=0 (it is not possible) or bit_s3=0 (double pedal is not stepped to the bottom) or bit_s4=0 (steering wheel is not turned left to dead end) or bit_s5=0 (steering wheel is not turned right to dead end), or bit_s6=0 (no water pump type determination is not performed) at the end of countdown, the coolant filling display status Bit is set to bit_add_dis=2 (exit filling), and the meter pop-up information "the coolant draining step fails".

S5, on the basis of completing the judgment of the type of the water pump, the water pump module and the temperature control module execute a cooling liquid filling and emptying strategy.

Because the actual emptying process generally requires the water pump to work at a proper rotating speed (the electronic water pump can regulate the speed, the mechanical water pump takes the idling of the engine into consideration and is a fixed rotating speed), the cooling liquid is driven to flow, and the temperature control module is required to be opened to a position with large circulation and small circulation staggered or other positions capable of ensuring the communication of the whole system. When the electronic water pump control module and the temperature control module receive bit_vac=1 (start cooling liquid filling and emptying strategies) when the electronic water pump control module and the temperature control module receive bit_vac=1 (the electronic water pump is designed, the electronic water pump respectively enters a corresponding cooling liquid filling working state, and the electronic water pump inquires a calibrated filling state rotating speed, and the filling state time, and takes the calibrated filling state rotating speed as a target rotating speed to execute for a long time; the temperature control module inquires the calibrated filling state opening degree, the filling state time and starts to execute the calibrated filling state opening degree as a target opening degree for a long time. When the filling state time of the electronic water pump is met under the set rotating speed, a signal ewp _finish=1 (the execution of the electronic water pump is finished), otherwise ewp _finish=0 (the execution of the electronic water pump is not finished); when the temperature control module is under the set opening degree and the working 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 cwbit_ ewp =0 (mechanical water pump) is preset, the mechanical water pump freely works along with the ignition of the engine, only the temperature control module performs corresponding actions inside, when the operation duration satisfies the filling state time under the set opening degree, 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 performed without starting the engine, and there is no risk, but if the electric quantity is low, or in a system with a mechanical water pump, the engine needs to be started, and in order to ensure safety, the emptying process must be kept at the in-situ idle speed in the whole course, if the engine speed exceeds the idle speed threshold value ±100deg.r/min, the user may perform a flameout operation, or step down the accelerator to make the engine reach the high idle speed, and in this process, in order to avoid accidents, the progress state of the cooling liquid filling and emptying strategy is set to bit_s6=0 (the judgment of the type of the unfinished water pump), the filling working state is set to bit_vac=0, which indicates that the cooling liquid filling and emptying strategy is not started, the filling display state is set to bit_add_dis=2 (the filling is exited), and the instrument popup information "the cooling liquid emptying step fails".

S6, judging whether the cooling liquid filling and emptying strategy is finished successfully or not on the basis that the water pump module and the temperature control module finish executing the cooling liquid filling and emptying strategy.

If the power assembly is designed with an electronic water pump, when the cwbit_ ewp =1 (electronic water pump) is preset, the EMS determines whether an electronic water pump execution completion signal ewp _finish and a temperature control module execution completion signal tmm_finish are equal to 1, if ewp _finish=1 (electronic water pump execution is completed) and tmm_finish=1 (temperature control module execution is completed), the filling and emptying is finished, at this time, the process state of the coolant filling and emptying strategy is set to bit_s7=1 (successful end), otherwise bit_s7=0 (unsuccessful end); if cwbit_ ewp =0 (mechanical water pump) is preset, the EMS only determines whether the execution completion signal tmm_finish of the temperature control module is equal to 1, if tmm_finish=1 (execution of the temperature control module is completed), it indicates that the filling and draining is completed, at this time, the process state of the coolant filling and draining strategy is set to bit_s7=1 (successful completion), otherwise bit_s7=0 (unsuccessful completion).

S7, after the cooling liquid filling and emptying strategy is successfully finished, the detection is also needed by a user.

After filling and emptying are successfully completed, the user needs to be prompted, after the step is completed, the user observes the liquid level of the expansion kettle, if the liquid level is reduced, the air is truly discharged, and the liquid needs to be properly supplemented to a proper liquid level for secondary inspection. If the liquid level is still kept at the upper scale mark, the cooling system is fully exhausted, the cooling system is filled with cooling liquid, the filling process is finished, an expansion kettle cover can be covered, a cabin cover is covered, and the cooling system is in a common state.

As described above, in the above full drain process, if the filling display status Bit is bit_add_dis=0 (normal state), the filling drain identification is not performed at this time, the meter does not make any special prompt, and when the filling display status Bit is bit_add_dis=1 (the system formally enters the filling drain policy condition identification process), it is indicated that the meter prompts "the coolant drain step is in progress" in the drain judgment process. When the filling display status Bit is bit_add_dis=2 (filling is exited), a certain step fails in the description process, the instrument prompts that the cooling liquid emptying step fails, the time lasts for a long time, after the countdown is finished, the filling display status Bit is bit_add_dis=0 (normal state), the normal state is restored, and the user operation is waited to restart. If and only if the EMS sets the progress state of the coolant filling and draining strategy to bit_s7=1 (successful end), indicating that filling was successful, bit_s7=1 (successful end), bit_add_dis=0 (normal state), and the normal state is restored. When bit_s7=1 (successful end), the instrument prompts that the cooling liquid emptying process is finished, and the duration is long, the prompt disappears after the duration is finished, and the whole process is finished.

In summary, according to the cooling liquid filling and emptying control method provided by the invention, through information interaction between the user and the whole vehicle controller, the engine control system recognizes the action of filling the cooling liquid by the user, controls the water pump module and the temperature control module to ignore the rapid heat engine requirement in the short time of the driving cycle, and acts according to the cooling liquid filling and emptying strategy, so that the situation that the cooling liquid filling fails due to the characteristics of the electrified cooling system, the cooling of the following engine is insufficient, or the water pump module misreports the fault is avoided, the user can finish the filling action by successfully performing one-time operation, and the operation safety of the following whole vehicle is ensured.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cooling liquid filling and emptying control method, characterized by comprising:

judging the feasibility of a cooling liquid filling and emptying strategy;

if the cooling liquid filling and emptying strategy can be executed, further confirming the execution intention of the cooling liquid filling and emptying strategy;

if the cooling liquid filling and emptying strategy is confirmed to be executed, the water pump module and the temperature control module are controlled to execute the cooling liquid filling and emptying strategy;

and after the water pump module and the temperature control module execute the cooling liquid filling and emptying strategy, judging whether the cooling liquid filling and emptying strategy is finished successfully.

2. The coolant fill and drain control method of claim 1, wherein determining the feasibility of a coolant fill and drain strategy comprises:

preliminarily judging the feasibility of a cooling liquid filling and emptying strategy;

further determining whether a coolant fill and drain strategy is indeed viable.

3. The coolant fill and drain control method of claim 2, wherein initially determining the feasibility of the coolant fill and drain strategy comprises:

judging whether the whole vehicle is electrified;

judging whether the engine cover is opened or not;

judging whether the expansion kettle cover is opened or not;

judging whether the current water temperature is lower than a filling threshold value or not;

if all the four conditions are met, the cooling liquid filling and emptying strategy is judged to be feasible preliminarily.

4. The coolant fill and drain control method of claim 2, further comprising determining whether a coolant fill and drain strategy is indeed viable comprises: judging whether the current vehicle speed is equal to 0km/h, whether the current gear is in the P gear and whether the engine speed is equal to 0r/min, and if so, judging that the cooling liquid filling and emptying strategy is truly feasible.

5. The coolant fill and drain control method of claim 1, wherein confirming the intent to execute the coolant fill and drain strategy comprises:

judging whether a user simultaneously steps on a brake pedal and an accelerator pedal to the bottom or not;

it is determined whether the user makes a turn of the steering wheel in one direction to the dead end.

6. The coolant fill and drain control method of claim 5, wherein confirming the intent to execute the coolant fill and drain strategy further comprises: it is determined whether the user has paid the steering wheel to the dead end in the other direction.

7. The coolant fill and drain control method of claim 1, further comprising, after confirming that a coolant fill and drain strategy is required to be performed:

judging the type of the water pump;

and after the water pump type judgment is finished, corresponding follow-up filling execution condition judgment is carried out according to the water pump type judgment result, and the cooling liquid filling and emptying strategy of the water pump module and the temperature control module is controlled after the corresponding filling execution condition is met.

8. The method for controlling filling and emptying of cooling liquid according to claim 7, wherein when the type of the water pump is determined, if the water pump is an electronic water pump, the current battery state needs to be further determined: whether the battery voltage is higher than an undervoltage threshold value and whether the high-voltage electric quantity is higher than a low-electric quantity threshold value, if so, starting a cooling liquid filling and emptying strategy, and if not, ending and prompting the filling process;

if the water pump is a mechanical water pump, whether the engine can be started successfully or not and whether the engine rotating speed is in a reasonable range or not are further judged in a set time, if so, a cooling liquid filling and emptying strategy is started, and if not, the filling process is ended and prompted.

9. The method for controlling the filling and emptying of the cooling liquid according to claim 1, wherein in executing the cooling liquid filling and emptying strategy, if the water pump is an electronic water pump, whether the filling state rotating speed and the filling state time of the electronic water pump reach set values or not is judged, whether the filling state opening degree and the filling state time of the temperature control module reach the set values or not is judged, and if the filling state opening degree and the filling state time reach the set values, the execution of the cooling liquid filling and emptying strategy is completed;

if the water pump is a mechanical water pump, judging whether the opening degree of the filling state of the temperature control module and the filling state time reach set values, and if so, completing the execution of the cooling liquid filling and emptying strategy.

10. The method for controlling the filling and emptying of the cooling liquid according to claim 1, wherein when judging whether the cooling liquid filling and emptying strategy is successfully finished, if the water pump is an electronic water pump, judging whether the filling state rotating speed and the filling state time of the electronic water pump and the filling state opening degree and the filling state time of the temperature control module reach set values again, and if so, ending the cooling liquid filling and emptying strategy successfully;

when the water pump is an electronic water pump, judging whether the filling opening degree and the filling state time of the temperature control module reach set values again, and if so, ending the cooling liquid filling and emptying strategy successfully.

11. The coolant filling and emptying control method as set forth in claim 1, further comprising user detection, specifically comprising:

the user observes the liquid level of the expansion kettle, if the liquid level is reduced, the liquid needs to be properly supplemented to a proper liquid level, and secondary inspection is carried out; if the liquid level is still kept at the upper scale mark, the internal part is completely exhausted, the cooling system is filled with cooling liquid, and the filling process is finished.