A water leakage diagnosis method, device, equipment and storage medium

Abstract

The present application relates to a kind of water leakage diagnostic method, device, equipment and storage medium, method includes: in the case where oil-electric hybrid vehicle is powered on and vehicle meets first preset condition, control electronic water pump in cooling system in vehicle to operate, to drive the cooling liquid flow of cooling system in heating ventilation and air conditioning cycle;First preset condition includes the one or more of the following conditions: the shutdown duration of vehicle is greater than preset duration, the temperature of cooling liquid is less than preset temperature threshold, upper cycle water leakage fault flag is true;In the case where the first operating parameter of electronic water pump obtained meets second preset condition, determine that cooling system appears cooling liquid leakage;Second preset condition is that the speed in first operating parameter is greater than first preset speed threshold, and the current in first operating parameter is less than first preset current threshold.The present application carries out cooling liquid leakage diagnosis by the operating parameter of original electronic water pump in cooling system, does not need to increase additional component, and can be executed in advance after vehicle is powered on, can foresee the cooling liquid leakage of cooling system in time, improves the timeliness of water leakage diagnosis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a water leakage diagnosis method, device, equipment and storage medium. BACKGROUND

[0002] With the increasing emphasis on energy and emissions, hybrid power has become one of the important ways to effectively solve carbon balance in the field of automobiles. The monitoring method of the cooling system leakage of hybrid power usually follows the method of traditional fuel vehicles, specifically, through the over-limit of the cooling liquid temperature of the engine (patent CN203939548U) to monitor or the driver to strengthen the inspection. This method has hysteresis and time-consuming. When the fault is missed or monitored, the engine and other critical components have already been in serious thermal runaway. When the driver stops the engine for processing, it may have caused irreversible damage. Accordingly, patent CN114562365A proposes to increase flow meters on both sides of the heat exchanger to monitor whether the flow is abnormal. However, this method requires additional components. SUMMARY

[0003] One of the purposes of the present application is to provide a water leakage diagnosis method to solve the problem of hysteresis in the prior art for water leakage diagnosis and the need to add components. The second purpose is to provide a water leakage diagnosis device. The third purpose is to provide a water leakage diagnosis equipment.

[0004] In order to achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows: in the case that the vehicle is powered on and the vehicle meets the first preset condition, the electronic water pump in the cooling system of the vehicle is controlled to operate to drive the cooling liquid of the heating and cooling cycle in the cooling system to circulate; the first preset condition includes one or more of the following conditions: the shutdown time of the vehicle is longer than the preset time, the temperature of the cooling liquid is less than the preset temperature threshold, and the upper cycle water leakage fault flag is true; in the case that the first operating parameter of the electronic water pump obtained meets the second preset condition, it is determined that the cooling system has a cooling liquid leakage; the second preset condition is that the rotating speed in the first operating parameter is greater than the first preset rotating speed threshold, and the current in the first operating parameter is less than the first preset current threshold.

[0005] According to the above technical means, the present application directly uses the operating parameters of the original electronic water pump in the cooling system to diagnose whether the cooling liquid in the cooling system leaks, without the need to add components. Moreover, the present application can detect whether the cooling liquid in the cooling system leaks in advance after the vehicle is powered on, thereby improving the timeliness of water leakage diagnosis.

[0006] Further, in a case where the first operating parameter does not satisfy the second preset condition, a heater in the cooling system is controlled to heat for a first preset time period; in a case where a temperature variation of a water outlet of the heater is greater than a first preset temperature variation threshold in the first preset time period, it is determined that the cooling system has a cooling liquid leakage.

[0007] According to the above technical means, the present application can also determine whether the cooling liquid of the cooling system leaks by the temperature variation of the original heater in the cooling system, which also does not need to increase parts, and can further determine whether the cooling liquid leaks based on the temperature variation of the heater in a case where it is determined that the cooling liquid of the cooling system does not leak based on the electronic water pump, which can improve the accuracy of the cooling liquid leakage.

[0008] Further, in a case where the vehicle is powered on and the vehicle does not satisfy the first preset condition, or the temperature variation is not greater than the preset temperature variation threshold, it is determined whether a driving object driving the vehicle has a warm air demand; in a case where the driving object has the warm air demand, the heater is controlled to heat; in a case where the temperature variation of the water outlet of the heater is greater than a preset temperature variation threshold, it is determined that the cooling system has a cooling liquid leakage.

[0009] According to the above technical means, the present application provides a case where the driving object has a warm air demand, and determines whether the cooling system has a cooling liquid leakage based on the temperature variation of the water outlet of the heater, which distinguishes the determination method of the cooling liquid leakage in different scenarios, and improves the timeliness and reliability of the cooling liquid determination.

[0010] Further, after the water leakage diagnosis device determines that the cooling system has a cooling liquid leakage, the following steps can be further performed: the vehicle is controlled to support only pure electric driving, and a first prompt information for checking the cooling liquid is sent to the driving object.

[0011] According to the above technical means, once the cooling system has a cooling liquid leakage, the vehicle is controlled to support only pure electric driving, i.e. the engine is prohibited from running, which can effectively avoid the heat damage of the engine caused by the cooling liquid leakage.

[0012] Further, after the water leakage diagnosis device determines that the cooling system has a cooling liquid leakage, the water leakage diagnosis device can further execute the following steps: obtaining a number of operations of the electronic water pump after the cooling system has a failure; in a case where the number of operations is less than a preset number of operation threshold, waiting for a preset waiting time length and then controlling the electronic water pump to operate, and updating the number of operations to obtain an updated number of operations; in a case where a second operation parameter of the electronic water pump does not satisfy a third preset condition, controlling the heater to heat for a second preset time period; the third preset condition is that a rotating speed in the second operation parameter is greater than a second preset rotating speed threshold, and a current in the second operation parameter is less than a second preset current threshold; in a case where a temperature variation of a water outlet of the heater in the second preset time period is not greater than a second preset temperature variation threshold, controlling the vehicle to support oil-electric hybrid driving, and sending second prompt information that the cooling system has returned to normal to the driver.

[0013] According to the above technical means, in the present application, after determining that the cooling system has a cooling liquid leakage, the operation parameter of the electronic water pump and the temperature variation of the outlet of the heater are combined to determine whether the cooling liquid leakage in the cooling system has recovered, and if it has recovered, the vehicle is controlled to support oil-electric hybrid driving, that is, the engine is allowed to operate, and second prompt information that the cooling system has returned to normal is sent to the driver.

[0014] Further, in a case where the number of operations is not less than the preset number of operation threshold, the control of the electronic water pump is stopped.

[0015] According to the above technical means, in the present application, in a case where the number of operations is greater than or equal to the preset number of operation threshold, it is indicated that the recovery has not been achieved after multiple attempts, and therefore, by setting the preset number of operation threshold, endless attempts due to water leakage are avoided, and the power supply of the vehicle is prevented from being exhausted or related components from being damaged.

[0016] Further, in a case where the second operation parameter satisfies the third preset condition and the updated number of operations is less than the preset number of operation threshold, the electronic water pump is controlled to continue operating after the preset waiting time length.

[0017] According to the above technical means, in the present application, in a case where the second operation parameter does not satisfy the third preset condition and the number of operations is less than the preset number of operation threshold, the electronic water pump is controlled to continue operating after the preset waiting time length to determine whether the cooling liquid leakage in the cooling system has recovered, thereby avoiding endless attempts to consume the power supply of the vehicle and damage related components.

[0018] The present application has the following beneficial effects:

[0019] (1) The present application directly uses the operating parameters of the original electronic water pump in the cooling system and the outlet temperature change characteristics of the heater to diagnose whether the coolant in the cooling system leaks, without the need to add parts.

[0020] (2) The present application can detect whether the coolant in the cooling system leaks before the vehicle is powered on, improving the timeliness of the water leakage diagnosis.

[0021] (3) The present application uses the vehicle's warm air demand scenario to monitor whether the cooling system leaks in real time, enhancing the redundancy of the water leakage diagnosis. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A flowchart of a water leakage diagnosis method provided for an embodiment of the present application;

[0023] Figure 2 A structural schematic diagram of an exemplary hybrid cooling system provided for an embodiment of the present application;

[0024] Figure 3 A flowchart of an exemplary water leakage diagnosis method provided for an embodiment of the present application Figure 1 ;

[0025] Figure 4 A flowchart of an exemplary water leakage diagnosis method provided for an embodiment of the present application Figure 2 ;

[0026] Figure 5 A flowchart of an exemplary method for determining that the cooling system has coolant leakage provided for an embodiment of the present application;

[0027] Figure 6 A flowchart of an exemplary method for recovering coolant leakage provided for an embodiment of the present application;

[0028] Figure 7 A flowchart of an exemplary method for recovering coolant leakage in the cooling system provided for an embodiment of the present application;

[0029] Figure 8 A structural schematic diagram of a water leakage diagnosis device provided for an embodiment of the present application;

[0030] Figure 9 A structural schematic diagram of a water leakage diagnosis device provided for an embodiment of the present application. DETAILED DESCRIPTION

[0031] Other advantages and embodiments of the application will be more readily appreciated from the following description, with reference to the accompanying drawings, in which:

[0032] The application provides a water leakage diagnosis method, which is realized by a water leakage diagnosis device, as shown in the following steps S101 to S103: Figure 1

[0033] In step S101, when the vehicle is powered on and the vehicle meets the first preset condition, the electronic water pump in the cooling system of the vehicle is controlled to operate to drive the coolant in the heating, ventilation and air conditioning (HVAC) cycle of the cooling system to flow; the first preset condition includes one or more of that the shutdown duration of the vehicle is greater than a preset duration, the temperature of the coolant is less than a preset temperature threshold, and the water leakage fault flag is true.

[0034] In the embodiment of the application, the vehicle is a hybrid vehicle, and after the vehicle is powered on, it can be judged whether the vehicle meets the first preset condition. For the first preset condition that the shutdown duration of the vehicle is greater than a preset duration, the application considers that the water leakage diagnosis should reduce other performance influences as much as possible. If the diagnosis is entered due to frequent power-on and power-off, it will inevitably cause an increase in power consumption and a reduction in the service life of parts. Therefore, a certain shutdown time (shutdown duration) is set to balance the diagnosis and performance. At the same time, a certain shutdown time is set to ensure that the whole vehicle is in a cold state, which can improve the reliability of the subsequent diagnosis based on temperature rise. The preset duration can be 8 hours or any other duration, and the specific preset duration can be set according to the actual situation and application requirements, which is not limited in the application. For the first preset condition that the temperature of the coolant is less than a preset temperature threshold, the application considers that if the temperature of the coolant is too high, such as close to 50 degrees, the temperature in the cooling cycle is relatively high, and the reliability of the diagnosis based on the temperature rise of the positive temperature coefficient (PTC) heater will be reduced.

[0035] Figure 2 An exemplary structure diagram of a hybrid cooling system is provided for the embodiment of the application. As shown in Figure 2 ​As shown, the hybrid cooling system includes a PTC heater 20, a water temperature sensor 21 of a PTC heater outlet, a warm air chip 22, an electronic water pump 23, a three-way valve 24, a three-way connector 25, an engine-side cooling related component 26, a mechanical water pump 27, and an engine body 28. The cooling system mainly includes two parts of circulation. The first part is a warm air cooling circulation. When the driver (driving object) has a warm air demand and the engine water temperature is low, the electronic water pump 23 works, the AB of the three-way valve 24 is turned on, the PTC heater 20 is started, the coolant is heated, and the cooling circulation flows from the electronic water pump 23, the three-way valve 24, the PTC heater 20, the temperature sensor 21 of the PTC heater outlet, and then flows through the warm air chip 22 to warm the driver. The second part is an engine-side cooling circulation. When the engine works, the cooling circulation flows through the mechanical water pump 27, the engine body 28, and the engine-side cooling related component 26. If the cooling water temperature of the engine side is high and there is a warm air demand at this time, the BC of the three-way valve 24 is turned on, and the coolant introduced from the engine side flows into the warm air circulation.

[0036] In the embodiment of the present application, as shown in Figure 2 If the hybrid electric vehicle is powered on and the vehicle meets the first preset condition, the water leakage diagnosis device controls the electronic water pump 23 in the cooling system of the vehicle to operate to drive the coolant flow in the warm air cooling circulation of the cooling system.

[0037] In step S102, if the first operating parameter of the electronic water pump meets the second preset condition, it is determined that the cooling system has a coolant leakage. The second preset condition is that the rotating speed in the first operating parameter is greater than the first preset rotating speed threshold, and the current in the first operating parameter is less than the first preset current threshold.

[0038] In the embodiment of the present application, if there is water leakage in the electronic water pump or other parts of the pipeline, the rotating speed of the electronic water pump will be relatively high and the current will be relatively small because the electronic water pump has almost no load. Based on this principle, the second preset condition is set in the present application. The first preset rotating speed threshold and the first preset current threshold in the second preset condition can be set according to actual needs and application scenarios, which are not limited in the present application. If the operating parameter of the electronic water pump meets the second preset condition, it is considered that the cooling system has a water leakage.

[0039] Compared with the existing technology, the coolant temperature and the driving object are detected, and the existing lag and time-consuming are overcome. The present application can determine whether the cooling system has a coolant leakage based on the operating parameter of the electronic water pump after the vehicle is powered on, which improves the timeliness and efficiency of the water leakage diagnosis. In addition, the operating parameter of the electronic water pump in the cooling system is directly used, without the need to increase parts, thereby reducing the cost.

[0040] In some embodiments, the water leakage diagnosis device determines that the cooling system has a coolant leakage in the following steps S301-S302:

[0041] Step S301: If the first operating parameter does not satisfy the second preset condition, the heater in the cooling system is controlled to heat for a first preset time period.

[0042] In the embodiments of the present application, if the first operating parameter does not satisfy the second preset condition, i.e., the speed of the electronic water pump is small or the current is large, it indicates that the cooling system determined based on the electronic water pump does not have a coolant leakage, and at this time the heating device in the cooling system is further controlled to heat for a first preset time period. The first preset time period can be set according to actual needs and application scenarios, and the present application does not limit this.

[0043] Step S302: If the temperature change amount of the outlet of the heater in the first preset time period is greater than a first preset temperature change amount threshold, it is determined that the cooling system has a coolant leakage.

[0044] In the embodiments of the present application, after the heating and cooling cycle, if there is water leakage near the PTC heater, when the PTC heater heats, there is no coolant flowing through, which is equivalent to heating air, and at this time the temperature change amount of the outlet of the PTC heater monitored by the PTC heater outlet temperature sensor is high, and then the cooling system circulation anomaly is diagnosed based on this principle. If the temperature change amount of the outlet of the heater in the first preset time period is greater than the first preset temperature change amount threshold, it indicates that the cooling system has a coolant leakage. The first preset temperature change amount threshold can be set according to actual needs and application scenarios, and the present application does not limit this.

[0045] In the embodiments of the present application, the water leakage diagnosis device determines that the cooling system has a coolant leakage in the following steps S401-S403:

[0046] Step S401: If the vehicle is powered on and the vehicle does not satisfy the first preset condition, or the temperature change amount is not greater than the preset temperature change amount threshold, it is determined whether the driver of the vehicle has a demand for warm air.

[0047] In the embodiments of the present application, if the vehicle is powered on and the first preset condition is not satisfied, and the temperature change amount of the outlet of the heater in the first preset time period is not greater than the first preset temperature change amount threshold, it indicates that the cooling system does not have a coolant leakage, and at this time it is determined whether the driver has a demand for warm air.

[0048] Step S402: If the driver has a demand for warm air, the heater is controlled to heat according to the demand for warm air.

[0049] In the embodiment of the present application, if the driver has a demand for warm air, the heater is controlled to heat according to the demand for warm air, and the temperature variation range of the water outlet of the heater is monitored in real time.

[0050] Step S403, if the temperature variation range of the water outlet of the heater is greater than the preset temperature variation range threshold, it is determined that the cooling system has a cooling liquid leakage.

[0051] In the embodiment of the present application, the temperature variation range of the water outlet of the heater is the temperature variation size of the current time compared with the starting time. For example, if the starting temperature of the PTC heater when heating is 15 degrees, and the temperatures at multiple times are 15 degrees, 18 degrees, 19 degrees, 26 degrees and 24 degrees, the temperature variation range in the whole process is 0 degrees, 3 degrees, 4 degrees, 11 degrees and 9 degrees. Here, it is mainly considered that in the case of having a demand for warm air, the temperature variation range of the cooling circulating water after being heated by the PTC heater is much smaller than the temperature variation range of the heated air. Then, if the temperature variation range of the water outlet of the heater is greater than the preset temperature variation range threshold, it can also indicate that the cooling system has a cooling liquid leakage.

[0052] In some embodiments, after the water leakage diagnosis device determines that the cooling system has a cooling liquid leakage, the following steps can be further performed: controlling the vehicle to support only pure electric driving, and sending a first prompt information to the driver to check the cooling liquid.

[0053] In the embodiment of the present application, if the water leakage diagnosis device determines that the cooling system has a cooling liquid leakage, if the engine is running at this time, the engine will have a problem of thermal damage caused by the cooling liquid leakage. Therefore, after the water leakage diagnosis device controls the cooling system to have a cooling liquid leakage, the vehicle is controlled to support only pure electric driving, that is, the engine is prohibited to run, and a first prompt information is sent to the driver to check the cooling liquid.

[0054] Figure 5 An exemplary flowchart for determining that the cooling system has a cooling liquid leakage is provided for the embodiment of the present application. As shown in Figure 5 The implementation of the water leakage diagnosis device for determining that the cooling system has a cooling liquid leakage includes the following steps S501 to S512.

[0055] Step S501, the whole vehicle KL15 is powered on.

[0056] Here, the vehicle is powered on.

[0057] Step S502, one or more preconditions or upper cycle water leakage fault flags F1 or F2 are true.

[0058] Here, if the vehicle satisfies the preconditions including the stop time, the environmental conditions, and the like, or one or more of the above-mentioned cycle leakage failure flag F1 or F2 is true (first predetermined condition), step S503 is executed, and if the preconditions are not satisfied, step S507 is executed.

[0059] Step S503, the electronic water pump is driven to operate, and the heating and cooling cycle is controlled to flow.

[0060] Here, the leakage diagnosis device drives the electronic water pump to operate to allow the coolant in the heating and cooling cycle to flow.

[0061] Step S504, it is determined whether the electronic water pump rotation speed exceeds a threshold value and the electronic water pump current is less than a threshold value.

[0062] Here, it is determined whether the electronic water pump rotation speed (rotation speed in the first operating parameter) exceeds a threshold value (first predetermined rotation speed threshold value) and the electronic water pump current (current in the first operating parameter) is less than a threshold value (first predetermined current threshold value). If the electronic water pump rotation speed exceeds the threshold value and the electronic water pump current is less than the threshold value, step S511 is executed, and if the electronic water pump rotation speed does not exceed the threshold value or the electronic water pump current is not less than the threshold value, step S505 is executed.

[0063] Step S505, the PTC heater is controlled to heat work.

[0064] Here, the leakage diagnosis device controls the PTC heater to heat work for a period of time (first predetermined time period).

[0065] Step S506, it is determined whether the PTC heater outlet water temperature change is higher than a threshold value.

[0066] Here, if the PTC heater outlet water temperature change (temperature change amount of the outlet) is higher than a threshold value (first temperature change amount threshold value), step S511 is executed. If the PTC heater outlet water temperature change is not higher than the threshold value, step S507 is executed.

[0067] Step S507, whether there is a demand for heating.

[0068] Here, the leakage diagnosis device determines whether the driver of the vehicle has a demand for heating, and if there is a demand for heating, step S508 is executed, and if there is no demand for heating, step S507 is continued.

[0069] Step S508, the PTC heater outlet temperature is monitored.

[0070] Here, the leakage diagnosis device detects the outlet temperature of the PTC heater in real time.

[0071] Step S509, it is determined whether the PTC heater outlet temperature change rate is higher than a threshold value.

[0072] Here, the water leakage diagnosis device determines whether the temperature change rate (temperature change amplitude) of the outlet water temperature of the PTC heater is higher than a threshold value (preset temperature change amplitude threshold value). If the temperature change rate of the outlet water temperature of the PTC heater is higher than the threshold value, step S510 is performed. If the temperature change rate of the outlet water temperature of the PTC heater is not higher than the threshold value, step S507 is performed.

[0073] Step S510, the fault water leakage flag F2 is set to true.

[0074] Here, the water leakage diagnosis device sets the fault water leakage flag to true, indicating that the cooling system has a cooling liquid leakage problem.

[0075] Step S511, the fault water leakage flag F1 is set to true.

[0076] Here, the water leakage diagnosis device sets the fault water leakage flag to true, indicating that the cooling system has a cooling liquid leakage problem.

[0077] Step S512, support pure electric driving, prohibit engine operation, and prompt the driver to check the cooling liquid.

[0078] Here, after the water leakage diagnosis device diagnoses that the cooling system has a cooling liquid leakage, the engine operation is prohibited to avoid damage caused by engine thermal failure due to insufficient cooling liquid, and the first prompt information for checking the cooling liquid is sent to the driver.

[0079] In some embodiments, after the water leakage diagnosis device determines that the cooling system has a cooling liquid leakage, the following steps S601 to S604 can also be performed:

[0080] Step S601, obtain the number of operations of the electronic water pump after the cooling system fails.

[0081] In the embodiments of the present application, after the cooling system has a cooling liquid leakage, the water leakage diagnosis device will attempt to run the electronic water pump multiple times to run the cooling liquid in the heating and cooling cycle to diagnose whether the cooling liquid leakage in the cooling system has been restored. Here, the water leakage diagnosis device obtains the number of operations of the electronic water pump after the cooling system fails.

[0082] Step S602, in the case where the number of operations is less than a preset number of operation threshold, the electronic water pump is controlled to operate after waiting for a preset waiting time, and the number of operations is updated to obtain an updated number of operations.

[0083] In the embodiment of the present application, if the number of operations is less than the preset number of operation threshold, the water leakage diagnosis device waits for a preset waiting time and then controls the electronic water pump to operate. Here, the water leakage diagnosis device sets the preset number of operation threshold, which can avoid endless attempts due to water leakage, and can prevent the vehicle power supply from being exhausted or related components from being damaged. The preset number of operation threshold can be set according to actual needs and application scenarios, and the present application is not limited in this regard.

[0084] In step S603, the heater is controlled to heat for a second preset time period when the second operation parameter of the electronic water pump does not meet a third preset condition. The third preset condition is that the rotational speed in the second operation parameter is greater than a second preset rotational speed threshold, and the current in the second operation parameter is less than a second preset current threshold.

[0085] In the embodiment of the present application, if the second operation parameter of the electronic water pump does not meet the third preset condition, it indicates that the cooling liquid leakage of the cooling system represented based on the first operation parameter of the electronic water pump may have recovered, and at this time, the heater is further controlled to heat for a second preset time. The first preset time period can be the same as or different from the second preset time period, the first preset rotational speed threshold can be the same as or different from the second preset rotational speed threshold, and the first preset current threshold can be the same as or different from the second preset current threshold. That is, the second preset time period, the second preset rotational speed threshold, and the second preset current threshold can be set according to actual needs and application scenarios, and the present application is not limited in this regard.

[0086] In step S604, the vehicle is controlled to support oil-electric hybrid driving, and a second prompt information that the cooling system has recovered to normal is sent to the driver when the temperature change amount of the water outlet of the heater in the second preset time period is not greater than a second preset temperature change amount threshold.

[0087] In the embodiment of the present application, if the temperature change amount of the water outlet of the heater in the second preset time period is not greater than the second preset temperature change amount threshold, it indicates that the cooling liquid leakage of the cooling system has recovered. At this time, the water leakage diagnosis device controls the vehicle to support oil-electric hybrid driving, that is, the vehicle can run the engine at this time, and sends a second prompt information that the cooling system has recovered to normal to the driver. The second preset temperature change amount threshold can be the same as or different from the first preset temperature change amount threshold. That is, the second preset temperature change amount threshold can be set according to actual needs and application scenarios, and the present application is not limited in this regard.

[0088] In some embodiments, the water leakage diagnosis device stops controlling the electronic water pump to operate when the number of operations is not less than the preset number of operation threshold.

[0089] In the embodiment of the present application, if the number of operation times is not less than the preset number of operation times threshold, it indicates that the water leakage diagnosis device has been tried many times and still fails to recover, at this time, the water leakage diagnosis device stops controlling the electronic water pump to operate, so as to avoid the vehicle power being exhausted or the related components being damaged due to endless attempts.

[0090] In some embodiments, in the case that the second operation parameter meets the third preset condition and the updated number of operation times is less than the preset number of operation times threshold, the water leakage diagnosis device waits for a preset waiting time and then continues to control the electronic water pump to operate.

[0091] In the embodiment of the present application, in the case that the second operation parameter meets the third preset condition and the updated number of operation times is less than the preset number of operation times threshold, the water leakage diagnosis device waits for a preset waiting time, controls the electronic water pump to operate again, and then executes step S603.

[0092] Figure 7 An exemplary flowchart for recovering the leakage of the coolant in the cooling system is provided in the embodiment of the present application. As shown in Figure 7 The recovery process can be directly connected to step S512, and the recovery of the leakage of the coolant in the cooling system includes steps S701 to S707 as follows:

[0093] Step S701, the number of attempts to run the heating cycle is less than a threshold value.

[0094] Here, the water leakage diagnosis device waits for t0 time (a preset waiting time) to attempt to run the heating cycle, if the number of attempts (the number of operation times) is less than the threshold value (the preset number of operation times threshold), step S702 is executed, and if the number of attempts is not less than the threshold value, the flow is directly ended.

[0095] Step S702, control the heating cycle to circulate and drive the water pump to operate.

[0096] Here, if the number of attempts is less than the threshold value, the water leakage diagnosis device controls the heating cycle to circulate and drives the electronic water pump to operate.

[0097] Step S703, judge whether the rotation speed of the electronic water pump is higher than a threshold value and the current is less than a threshold value.

[0098] Here, it is judged that the rotation speed of the electronic water pump (the rotation speed in the second operation parameter) is higher than a threshold value (the second preset rotation speed threshold value), and the current of the electronic water pump (the current in the second operation parameter) is less than a threshold value (the second preset current threshold value). If the rotation speed of the electronic water pump exceeds the threshold value and the current of the electronic water pump is less than the threshold value, step S705 is executed; if the rotation speed of the electronic water pump does not exceed the threshold value or the current of the electronic water pump is not less than the threshold value, step S704 is executed.

[0099] Step S704, control the PTC heater to heat.

[0100] Here, the water leakage diagnosis device controls the PTC heater to heat up in the case where the rotation speed of the electric water pump does not exceed the threshold value or the electric current of the electric water pump is not less than the threshold value.

[0101] Step S705, determine whether the temperature change of the PTC heater outlet is higher than the threshold value.

[0102] Here, if the temperature change (temperature change amount) of the PTC heater outlet is higher than the threshold value (second preset temperature change amount threshold value), step S701 is continued to be executed, and if the temperature change of the PTC heater outlet is not higher than the threshold value, step S706 is executed.

[0103] Step S706, restore the water leakage flag bits F1 and F2.

[0104] Here, if the rotation speed of the electric water pump does not exceed the threshold value or the electric current is not less than the threshold value, and the temperature change of the PTC heater outlet is not higher than the threshold value, it is indicated that the leakage of the coolant of the cooling system has been restored, and at this time the water leakage diagnosis device restores the water leakage flag bits F1 and F2.

[0105] Step S707, hybrid driving is performed, the engine is allowed to operate, and the driver and passenger are prompted that the cooling system has returned to normal.

[0106] Here, the water leakage diagnosis device controls the vehicle to support oil-electric hybrid driving, and sends the second prompt information that the cooling system has returned to normal to the driver and passenger (driving object).

[0107] The present application provides a water leakage diagnosis method, the method comprising: in the case where the oil-electric hybrid vehicle is powered on and the vehicle meets the first preset condition, controlling the electric water pump in the cooling system of the vehicle to operate to drive the coolant of the heating, ventilation and air conditioning cycle in the cooling system to flow; the first preset condition comprises one or more of the following: the shutdown time length of the vehicle is greater than a preset time length, the temperature of the coolant is less than a preset temperature threshold value, and the upper cycle water leakage fault flag bit is true; in the case where the first operating parameter of the electric water pump obtained meets the second preset condition, determining that the cooling system has a coolant leakage; the second preset condition is that the rotation speed in the first operating parameter is greater than a first preset rotation speed threshold value, and the electric current in the first operating parameter is less than a first preset electric current threshold value. At the same time, by actively controlling the heater, monitoring whether the temperature change amount of the water outlet of the heater in the first preset time period is greater than a first preset temperature change amount threshold value, or passively controlling the heater, monitoring whether the temperature change amplitude of the water outlet of the heater is greater than a preset temperature change amplitude threshold value. The present application diagnoses the coolant leakage by using the operating parameters of the original electric water pump in the cooling system and the outlet temperature change characteristics caused by the heater, without adding additional components, and can be executed in advance after the vehicle is powered on, so as to timely foresee the coolant leakage of the cooling system and improve the timeliness of the water leakage diagnosis.

[0108] This invention provides a leak diagnosis device, such as... Figure 8 As shown, it includes:

[0109] The control module 801 is used to control the operation of the electronic water pump in the cooling system of the vehicle when the hybrid vehicle is powered on and the vehicle meets the first preset conditions, so as to drive the flow of coolant in the HVAC cooling cycle of the cooling system; the first preset conditions include one or more of the following: the vehicle's downtime is longer than a preset time, the coolant temperature is lower than a preset temperature threshold, and the upper circulation water leakage fault flag is true.

[0110] The determination module 802 is used to determine that the cooling system has a coolant leak when the first operating parameters of the acquired electronic water pump meet the second preset condition; the second preset condition is that the rotational speed in the first operating parameters is greater than the first preset rotational speed threshold, and the current in the first operating parameters is less than the first preset current threshold.

[0111] In one embodiment of the present invention, the determining module 802 is further configured to control the heater in the cooling system to heat for a first preset time period when the first operating parameters do not meet the second preset conditions; and to determine that the cooling system has a coolant leak when the temperature change at the outlet of the heater is greater than the first preset temperature change threshold during the first preset time period.

[0112] In one embodiment of the present invention, the determining module 802 is further configured to determine whether the driver of the vehicle has a need for heating when the vehicle is powered on and the vehicle does not meet the first preset condition, or the temperature change is not greater than the preset temperature change threshold; control the heater to heat when the driver has a need for heating; and determine that the cooling system has a coolant leak when the temperature change at the outlet of the heater is greater than the preset temperature change threshold.

[0113] In one embodiment of the present invention, the leak diagnosis device further includes a sending module (not shown in the figure) for controlling the vehicle to support only pure electric driving and sending a first prompt message to the driver to check the coolant.

[0114] In an embodiment of the present application, the control module 801 is further configured to acquire a running number of the electronic water pump after the cooling system fails; in a case where the running number is less than a preset running number threshold, the electronic water pump is controlled to run after a preset waiting duration, and the running number is updated to obtain an updated running number; in a case where the second running parameter of the electronic water pump does not satisfy a third preset condition, the heater is controlled to heat for a second preset time period; the third preset condition is that a rotating speed in the second running parameter is greater than a second preset rotating speed threshold, and a current in the second running parameter is less than a second preset current threshold; in a case where a temperature variation of the water outlet of the heater in the second preset time period is not greater than a second preset temperature variation threshold, the vehicle is controlled to support hybrid driving, and a second prompt information that the cooling system is back to normal is sent to the driver.

[0115] In an embodiment of the present application, the control module 801 is further configured to, in a case where the running number is not less than the preset running number threshold, stop controlling the electronic water pump to run.

[0116] In an embodiment of the present application, the control module 801 is further configured to, in a case where the second running parameter satisfies the third preset condition and the updated running number is less than the preset running number threshold, continue to control the electronic water pump to run after a preset waiting duration.

[0117] An embodiment of the present application provides a water leakage diagnosis device, as shown in the accompanying drawings, the vehicle includes a first processor 901, a first memory 902 and a first communication bus 903. Figure 9

[0118] The first communication bus 903 is configured to realize communication connection between the first processor 901 and the first memory 902.

[0119] The first processor 901 is configured to execute a computer program stored in the first memory 902 to realize the above-mentioned water leakage diagnosis method.

[0120] ​The embodiment of the present application provides a computer readable storage medium, characterized in that the computer readable storage medium stores one or more computer programs, and the one or more computer programs can be executed by one or more processors to implement the water leakage diagnosis method. The computer readable storage medium can be a volatile memory (volatile memory), such as a random access memory (Random-Access Memory, RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (Read-Only Memory, ROM), a flash memory, a hard disk (Hard Disk Drive, HDD) or a solid state disk (Solid-State Drive, SSD); or a device including one or any combination of the above memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc.

[0121] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage, etc.) containing computer-usable program code.

[0122] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device implemented in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flow or flows and / or block or blocks.

[0123] These computer program instructions can also be stored in a computer readable memory that can direct the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including instruction apparatus, which implements the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flow or flows and / or block or blocks.

[0124] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are generated to realize the computer-implemented processes in the computer or other programmable devices, and the instructions executed in the computer or other programmable devices provide the steps for implementing the functions specified in the flowchart Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0125] The above description is merely one specific implementation of the application. However, one of ordinary skill in the art should, in light of the above description, appreciate changes and modifications made in the scope of the technology disclosed by the present application. Therefore, the protective scope of the present application should be subject to the protection scope of the claims.

Claims

1. A water leakage diagnosing method characterized by comprising: The method comprises: In the case that the vehicle is powered on and the vehicle meets the first preset condition, the electronic water pump in the cooling system of the vehicle is controlled to operate to drive the coolant of the heating, ventilation and air conditioning (HVAC) cycle in the cooling system to flow; the first preset condition comprises one or more of the following conditions: the vehicle has been stopped for more than a preset time length, the temperature of the coolant is less than a preset temperature threshold, and a water leakage fault flag of the HVAC cycle is true; In the case that the first operating parameter of the electronic water pump meets the second preset condition, it is determined that the cooling system has a coolant leakage; the second preset condition is that the rotating speed in the first operating parameter is greater than a first preset rotating speed threshold, and the current in the first operating parameter is less than a first preset current threshold; The number of operations of the electronic water pump after the cooling system has a fault is obtained; In the case that the number of operations is less than a preset number of operation threshold, the electronic water pump is controlled to operate after a preset waiting time length, and the number of operations is updated to obtain an updated number of operations; In the case that the second operating parameter of the electronic water pump does not meet the third preset condition, the heater in the cooling system is controlled to heat for a second preset time period; the third preset condition is that the rotating speed in the second operating parameter is greater than a second preset rotating speed threshold, and the current in the second operating parameter is less than a second preset current threshold; In the case that the temperature change amount of the water outlet of the heater in the second preset time period is not greater than a second preset temperature change amount threshold, the vehicle is controlled to support hybrid electric driving, and second prompt information that the cooling system has returned to normal is sent to a driver of the vehicle.

2. The method of claim 1, wherein, The method further comprises: In the case that the first operating parameter does not meet the second preset condition, the heater in the cooling system is controlled to heat for a first preset time period; In the case that the temperature change amount of the water outlet of the heater in the first preset time period is greater than a first preset temperature change amount threshold, it is determined that the cooling system has a coolant leakage.

3. The method of claim 2, wherein, The method further comprises: In the case that the vehicle is powered on and the vehicle does not meet the first preset condition, or the temperature change amount is not greater than the first preset temperature change amount threshold, it is determined whether a driver of the vehicle has a demand for heating; In the case that the driver has the demand for heating, the heater is controlled to heat according to the demand for heating; In the case that the temperature change range of the water outlet of the heater is greater than a preset temperature change range threshold, it is determined that the cooling system has a coolant leakage.

4. The method of claim 3, wherein, After the cooling system is determined to have a coolant leakage, the method further comprises: The vehicle is controlled to support only pure electric driving, and first prompt information that the coolant is checked is sent to the driver.

5. The method of claim 1, wherein, The method further comprises: In the case that the number of operations is not less than the preset number of operation threshold, the electronic water pump is stopped from being controlled to operate.

6. The method of claim 1, wherein, The method further comprises: In a case where the second operation parameter meets the third preset condition and the updated operation frequency is less than the preset operation frequency threshold, the electronic water pump is controlled to continue operating after waiting for a preset waiting duration.

7. A water leakage diagnosing apparatus characterized by comprising: The method comprises the following steps: The control module is configured to control an electronic water pump in a cooling system of a hybrid vehicle to operate to drive cooling liquid of a heating, ventilation and air conditioning (HVAC) cycle in the cooling system to flow when the hybrid vehicle is powered on and meets a first preset condition; the first preset condition comprises one or more of the following conditions: a shutdown duration of the hybrid vehicle is greater than a preset duration, a temperature of the cooling liquid is less than a preset temperature threshold, and a water leakage fault flag of the HVAC cycle is true. The determination module is configured to determine that the cooling system has a cooling liquid leakage in a case where a first operation parameter of the electronic water pump meets a second preset condition. The second preset condition is that a rotational speed in the first operation parameter is greater than a first preset rotational speed threshold and a current in the first operation parameter is less than a first preset current threshold. The determination module is further configured to obtain an operation frequency of the electronic water pump after the cooling system has a fault. In a case where the operation frequency is less than a preset operation frequency threshold, the electronic water pump is controlled to operate after waiting for a preset waiting duration, and the operation frequency is updated to obtain an updated operation frequency. In a case where a second operation parameter of the electronic water pump does not meet a third preset condition, a heater in the cooling system is controlled to heat for a second preset time period; the third preset condition is that a rotational speed in the second operation parameter is greater than a second preset rotational speed threshold and a current in the second operation parameter is less than a second preset current threshold. In a case where a temperature change amount of a water outlet of the heater in the second preset time period is not greater than a second preset temperature change amount threshold, the hybrid driving of the vehicle is supported, and second prompt information that the cooling system has returned to normal is sent to a driver of the vehicle.

8. A water leakage diagnosing apparatus characterized by comprising: The method comprises the following steps: The processor, the memory and the communication bus; The communication bus is configured to realize communication connection between the processor and the memory; The processor is configured to execute a computer program stored in the memory to realize the water leakage diagnosis method in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores one or more computer programs, and the one or more computer programs can be executed by one or more processors to realize the water leakage diagnosis method in any one of claims 1 to 6.

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