A Monitoring Method, System and Vehicle for the Discharge Capacity of HEV Power Batteries

Abstract

The present invention provides a method, a system and a vehicle for monitoring the discharging capacity of an HEV power battery. By accurately testing the power boundary required for starting the hybrid engine and the discharging power boundary of the battery, the levels of low battery power of the HEV battery are classified, and the battery power and starting situation are accurately predicted. Through the in-vehicle intelligent remote terminal and the out-of-vehicle remote mobile terminal, remote reminder and control are applied to charge the low-power battery, so that the HEV model can proactively give low-battery reminders to users in advance and control the starting of the engine for charging.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery control for hybrid vehicles, and particularly relates to the monitoring technology of power batteries for hybrid vehicles. Background Art

[0002] Facing increasingly stringent fuel consumption and emission regulations, the automotive industry is facing huge challenges in energy conservation and emission reduction. Using electricity to replace or reduce dependence on fossil fuels has increasingly become the mainstream technical means for various automobile manufacturers, such as pure electric vehicles and hybrid electric vehicles. A non-plug-in hybrid electric vehicle (hereinafter referred to as HEV) can achieve at least 25% fuel economy (WLTC working condition) on the basis of the original fuel vehicle without changing the driving habits of users, without restricting the usage scenarios, and being insensitive to policy fluctuations and the construction process of infrastructure.

[0003] For non-plug-in hybrid electric vehicles, monitoring the discharge capacity of the battery is very important for the normal operation of the vehicle, and there have been some related researches and applications in the prior art. Patent document CN201110007438.9 discloses a method for monitoring a vehicle battery, which includes: running a timer when the vehicle and the control module are in a shutdown state, waking up the control module after a first time increment measured by the timer and setting a second time increment. If necessary, the method samples the first state of charge of the battery and determines whether the battery needs to be charged before the second time increment expires based on the sampled first state of charge. Determining whether the battery needs to be charged may include comparing the first state of charge with a threshold state of charge, or comparing it with a second state of charge measured after the second time increment. Diagnostic messages can be sent from the vehicle via a communication path, and if the battery needs to be charged, a warning message is sent to a receiving point accessible to the vehicle operator. The above technology only uses the state of charge SOC value as the judgment criterion for determining whether the battery needs to be charged. However, since the SOC of the power battery is affected by temperature, the discharge capacity of the battery may vary under different temperature environments and different powers. Therefore, only comparing with the SOC of the power battery, the accuracy is not high, and it is not very accurate to determine the battery discharge capacity.

[0004] In addition, when the power battery of an HEV model is placed for too long, the discharge capacity will be too low. At this time, remote monitoring, actively reminding and controlling the engine to start for charging will bring a better vehicle use experience to users. Summary of the Invention

[0005] In view of the above deficiencies in the prior art, the present invention provides a method, a system and a vehicle for monitoring the discharge capacity of a HEV power battery, aiming to solve the problem of how to more accurately monitor the discharge capacity of the power battery of a HEV vehicle in different temperature environments or when the vehicle has been parked for too long, resulting in too low discharge capacity, and remotely and actively remind and control the engine to start for charging.

[0006] The technical solution of the present invention is as follows:

[0007] In the first aspect, the present invention provides a method for monitoring the discharge capacity of a HEV power battery, the method comprising:

[0008] Regularly detecting the battery temperature and the state of charge;

[0009] Then, according to the detected battery temperature and discharge power parameters, it is judged which level of the weak HEV battery discharge capacity reminder signal BMS_LowSOP is met.

[0010] The unique part of the present invention is that the weak HEV battery discharge capacity reminder signal BMS_LowSOP is obtained by dividing the discharge power boundary Pdch into at least three levels, namely 0, 1, and 2, corresponding to normal power, low power, and extremely low power. The discharge power boundary Pdch is the discharge boundary power required for the minimum starting boundary Pstart of the high-voltage ISG motor and the hybrid engine; the minimum starting boundary Pstart is the minimum starting power boundary required to start the hybrid engine at different temperatures obtained by previously testing the high-voltage ISG motor and the hybrid engine, that is, the temperature-power T-Pstart.

[0011] Finally, according to different weak HEV battery discharge capacity reminder signals BMS_LowSOP, different signals are sent to directly put the whole vehicle to sleep, or give a low-power reminder, or control the engine to start for charging.

[0012] According to an embodiment of the present invention, the above-mentioned judging which level of the weak HEV battery discharge capacity reminder signal BMS_LowSOP is met according to the detected battery temperature and discharge power parameters, the judgment conditions are as follows:

[0013] BMS_LowSOP = 2, (Tbat ≤ -40°C && Pdch ≤ 6kw) or (-39°C ≤ Tbat ≤ -35°C && Pdch ≤ 5.5kw) or (-34°C ≤ Tbat ≤ -29°C && Pdch ≤ 4.5kw) or (-28°C ≤ Tbat ≤ -24°C && Pdch ≤ 4kw) or (-23°C ≤ Tbat ≤ -15°C && Pdch ≤ 3.5kw) or (-14°C ≤ Tbat ≤ -1°C && Pdch ≤ 2.5kw);

[0014] BMS_LowSOP=1, (Tbat≤-40℃&&6.5kw≤Pdch≤8kw) or (-39℃≤Tbat≤-35℃&&5.5kw≤Pdch≤6kw) or (-34℃≤Tbat≤-29℃&&4.5kw≤Pdch≤5kw)o r(-28℃≤Tbat≤-24℃&&3.5kw≤Pdch≤4kw)or(-23℃≤Tbat≤-15℃&&2.5kw≤Pdch≤3kw)or(-14℃≤Tbat≤0℃&&1.5kw≤Pdch≤2kw)or(1℃≤Tbat &&Pdch≤1kw).

[0015] , that is, the parameter range not included in the above levels 2 and 1.

[0016] It can be seen from the above scheme that the present invention mainly obtains the precise performance matching relationship between the two after conducting a preliminary test on the starting requirements of the hybrid system motor and the engine at different temperatures, and conducting a preliminary test on the battery discharge capacity at different temperatures and different powers. That is, after accurately testing the power boundary required for starting the hybrid engine and the discharge power boundary of the battery, the battery management system integrates this signal, accurately predicts the battery power and starting status, and actively sends it to the on-board intelligent remote communication system at a regular time, and finally sends it to the customer's mobile phone APP through the mobile network protocol to issue a low-battery reminder and control the engine start for charging.

[0017] After accurately testing the power boundary required for hybrid engine starting and the discharge power boundary of the battery, the present invention accurately predicts the battery power and starting status through the on-board intelligent remote terminal and the off-board remote mobile terminal application, so that the HEV model actively reminds the user to start the engine in advance to charge the HEV power battery and reminds the user to charge the vehicle, thereby achieving a closed-loop control effect of the entire system.

[0018] Therefore, the present invention not only divides the low-battery level of the HEV battery by accurately testing the power boundary required for hybrid engine starting and the discharge power boundary of the battery, and realizes recharging the low-battery battery through remote reminder and control, but also logically realizes closed-loop control of the entire process of vehicle waking up the engine to start, shut down, and sleep.

[0019] In a second aspect, the present invention provides a HEV power battery discharge capacity monitoring system, the system is used to implement the HEV power battery discharge capacity monitoring method described in the first aspect above, and the system includes an HEV in-vehicle system and an HEV out-vehicle system.

[0020] The HEV in-vehicle system includes an HEV high-voltage power battery (including a battery management system, hereinafter referred to as BMS), a high-voltage ISG motor, a hybrid engine, and an in-vehicle intelligent remote system, which is used to monitor the battery discharge capacity status in real time after the user parks the vehicle, provide the minimum electrical energy required to start the engine, and transmit corresponding reminder signals; the HEV out-of-vehicle system includes a remote mobile terminal application that matches the functions of the in-vehicle intelligent remote system, which is used to remind the user of low battery power and remotely control the engine start and stop functions.

[0021] In a second aspect of the present invention, there is provided a vehicle configured with the HEV power battery discharge capacity monitoring system described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the HEV power battery discharge capacity monitoring system according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic flowchart of the HEV power battery discharge capacity monitoring and remote start method according to an embodiment of the present invention.

[0024] Reference numerals in the figures: 1 - HEV high-voltage power battery (internally integrated with a battery management controller), 2 - high-voltage ISG motor, 3 - hybrid engine, 4 - in-vehicle intelligent remote system, 5 - remote mobile terminal application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the relative arrangements of components, numerical expressions, numerical values, and symbols described in these embodiments are only for illustration and explanation, and do not limit the scope of the present invention.

[0026] As Figure 1 shown, in an embodiment of the present invention, the remote active monitoring of the HEV power battery discharge capacity and control system includes an HEV in-vehicle system and an HEV out-of-vehicle system.

[0027] The HEV in-vehicle system includes an HEV high-voltage power battery 1 (such as a high-rate small-capacity high-voltage ternary lithium-ion battery pack), a high-voltage ISG motor 2, a hybrid engine 3, and an in-vehicle intelligent remote system 4. The in-vehicle system is mainly used to monitor the battery discharge capacity status in real time after the user parks the vehicle, provide the minimum electrical energy required to start the engine, transmit corresponding reminder signals, etc.

[0028] The HEV external system includes a remote mobile terminal application 5 that matches the functions of the in-vehicle intelligent remote system, which mainly integrates and displays low battery power reminders and remotely controls the engine start and stop functions.

[0029] Specifically, when implemented, as Figure 1As shown in the figure, the HEV high-voltage power battery (integrated battery management controller) 1 is connected to the high-voltage ISG motor 2 through a high-voltage wire harness.

[0030] During specific implementation, as Figure 1 shown, the high-voltage ISG motor 2 is fixedly connected to the hybrid engine 3 through a coaxial gear with a certain speed ratio.

[0031] During specific implementation, as Figure 1 shown, the HEV high-voltage power battery (integrated battery management controller) 1 is connected to the vehicle-mounted intelligent remote system 4 through the CAN bus. The reminder signal of the discharge capacity of the power battery system is sent to the vehicle-mounted intelligent remote system 4 through the CAN bus line.

[0032] During specific implementation, as Figure 1 shown, the vehicle-mounted intelligent remote system 4 and the remote mobile terminal application 5 perform information interaction through the mobile 4G / 5G network communication protocol to achieve the closed-loop control of remotely starting and shutting down the engine of the vehicle.

[0033] Another embodiment of the present invention is a method for monitoring the discharge capacity and remotely starting of the power battery of an HEV vehicle. Refer to Figure 2 , which shows the flow for monitoring the state of charge of the HEV vehicle battery, remotely reminding of low battery, starting the engine for charging, and shutting down the engine.

[0034] Step S10: The high-voltage ISG motor 2 and the hybrid engine 3 are tested through a temperature bench, a rotational speed tester, a torque tester, and a power tester to obtain the minimum starting power boundary (temperature - power T - Pstart) required to start the hybrid engine 3 at different temperatures.

[0035] Step S11: The HEV high-voltage power battery (integrated battery management controller) 1 matches the discharge boundary power Pdch required for the minimum starting boundary Pstart required by the high-voltage ISG motor 2 and the hybrid engine 3.

[0036] Step S12: The HEV high-voltage power battery (integrated battery management controller) 1 regularly monitors the battery temperature and discharge power status. The regular monitoring is generally set to 5 days, and the monitoring time is 1 minute.

[0037] Step S13: The HEV high-voltage battery (integrated battery management controller) 1 divides the discharge power boundary Pdch into 3 levels based on the state parameters detected in Step S12 and integrates them into the HEV battery discharge capacity weak reminder signal BMS_LowSOP (0 / 1 / 2). The establishment conditions are as follows:

[0038] BMS_LowSOP = 2, (Tbat ≤ -40°C && Pdch ≤ 6 kw) or (-39°C ≤ Tbat ≤ -35°C && Pdch ≤ 5.5 kw) or (-34°C ≤ Tbat ≤ -29°C && Pdch ≤ 4.5 kw) or (-28°C ≤ Tbat ≤ -24°C && Pdch ≤ 4 kw) or (-23°C ≤ Tbat ≤ -15°C && Pdch ≤ 3.5 kw) or (-14°C ≤ Tbat ≤ -1°C && Pdch ≤ 2.5 kw)

[0039] BMS_LowSOP = 1, (Tbat ≤ -40°C && 6.5 kw ≤ Pdch ≤ 8 kw) or (-39°C ≤ Tbat ≤ -35°C && 5.5 kw ≤ Pdch ≤ 6 kw) or (-34°C ≤ Tbat ≤ -29°C && 4.5 kw ≤ Pdch ≤ 5 kw) or (-28°C ≤ Tbat ≤ -24°C && 3.5 kw ≤ Pdch ≤ 4 kw) or (-23°C ≤ Tbat ≤ -15°C && 2.5 kw ≤ Pdch ≤ 3 kw) or (-14°C ≤ Tbat ≤ 0°C && 1.5 kw ≤ Pdch ≤ 2 kw) or (1°C ≤ Tbat && Pdch ≤ 1 kw).

[0040] , that is, the parameter range not included in level 2 and level 1.

[0041] Through the above steps, accurately test the starting ability of the hybrid system, ISG and engine corresponding to different temperatures and powers of the battery, and integrate the starting ability boundary into the HEV battery low power reminder signal BMS_LowSOP, which can be sent to the remote system for active reminder and diagnostic storage. This is the unique innovation of the present invention. BMS_LowSOP is determined by testing different temperatures and powers. It is more accurate than the prior art that only uses the state of charge SOC value, because the SOC of the power battery is affected by temperature and has a lower algorithm accuracy than SOP power. SOP directly determines the battery discharge ability through testing.

[0042] Step S13, determine that when BMS_lowSOP = 0, go to step S19, and the whole vehicle directly sleeps; determine that when BMS_lowSOP ≠ 0, go to step 14:

[0043] Step S14, the HEV high-voltage battery power battery (integrated battery management controller) 1 wakes up the in-vehicle intelligent remote system 4 through the CAN network management.

[0044] Step S15, when it is determined that BMS_lowSOP = 2, the HEV high-voltage battery power battery (integrated battery management controller) 1 sends the signal of BMS_lowSOP = 2 to the vehicle-mounted intelligent remote system 4 via the CAN bus, and then sends it to the remote mobile terminal application 5 via the 4G / 5G mobile network communication protocol, and enters Step S16;

[0045] When it is determined that BMS_lowSOP = 1, the HEV high-voltage battery power battery (integrated battery management controller) 1 sends the signal of BMS_lowSOP = 1 to the vehicle-mounted intelligent remote system 4 via the CAN bus, and then sends it to the remote mobile terminal application 5 via the 4G / 5G mobile network communication protocol, and enters Step S17.

[0046] In Step S16, the remote mobile terminal application 5 (such as APP) reminds that "the power battery of your beloved car is extremely low, and the vehicle cannot be started. Please contact the local dealer". After 1 minute, it enters Step S19, and the whole vehicle goes to sleep.

[0047] Step S17, the remote mobile terminal application 5 (such as APP) reminds that "the power battery of your beloved car is low. Please start the engine to charge".

[0048] Step S18, the management system EMS of the hybrid engine 3 judges the engine starting conditions.

[0049] Step S19, the whole vehicle goes to sleep.

[0050] Step S20, when the engine starting conditions are met, the engine starts to charge.

[0051] Step S21, when the HEV high-voltage battery power battery (integrated battery management controller) 1 judges that the charging SOP ≥ 10kw, the HEV high-voltage battery power battery (integrated battery management controller) 1 sends the signal of SOP ≥ 10kw to the vehicle-mounted intelligent remote system 4 via the CAN bus, and then sends it to the remote mobile terminal application 5 via the 4G / 5G mobile network communication protocol.

[0052] Step S22, the remote mobile terminal application 5 reminds that "the power battery of your beloved car is normal, and the vehicle is about to turn off". Randomly, after 1 minute, it enters Step S19.

[0053] In this way, the present invention not only actively monitors the state of the battery discharge capacity, actively sends the vehicle starting command and charges the battery. Most importantly, it actively reminds the user after charging is completed. Therefore, the present invention is a closed-loop control.

[0054] As can be seen from the above embodiments, the above method and system for monitoring the discharge capacity of power batteries skillfully utilize in-vehicle network communication technology, and accurately identify the starting boundary of the hybrid power engine and achieve remote control of the engine. The invention solves the problem that there is currently no such function in the existing HEV models on the market. After the vehicle is turned off and parked, the intelligent cloud system of the whole vehicle can cooperate with the battery management system (hereinafter referred to as BMS) to actively and remotely monitor the low battery state, and through the remote mobile terminal software, the user can be informed in advance that the power battery has too low power and request to start the engine to charge in time.

[0055] The uniqueness of the present invention lies in that after accurately testing the power boundary required for starting the hybrid engine and the discharge power boundary of the battery, through the in-vehicle intelligent remote terminal and the application software of the out-of-vehicle remote mobile terminal, the battery power and starting situation can be accurately predicted, so that the HEV model can actively remind the user in advance to start the engine to charge the HEV power battery and remind the user to charge the vehicle, achieving the closed-loop control effect of the whole system.

[0056] Above, we have described in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not used to limit the protection scope of the present application.

[0057] In addition, it should be understood that the various steps recorded in the method embodiments of the present application can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps without departing from the scope of the present application. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods. In addition, any combination can be made between the various different embodiments of the present invention as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A method for monitoring the discharge capacity of an HEV power battery, characterized in that, Including: Timely detecting the battery temperature and state of charge; Judging which level of the weak HEV battery discharge capacity reminder signal BMS_LowSOP is met according to the detected battery temperature and discharge power parameters; the weak HEV battery discharge capacity reminder signal BMS_LowSOP is obtained by dividing the discharge power boundary Pdch into at least 3 levels, namely 0, 1, and 2, corresponding to normal battery power, low battery power, and extremely low battery power; the discharge power boundary Pdch is the discharge boundary power required for the minimum starting boundary Pstart of the high-voltage ISG motor and the hybrid engine; the minimum starting boundary Pstart is the minimum starting power boundary required to start the hybrid engine at different temperatures obtained by pre-testing the high-voltage ISG motor and the hybrid engine, that is, temperature-power T-Pstart; Sending different signals according to different weak HEV battery discharge capacity reminder signals BMS_LowSOP to directly put the whole vehicle to sleep, or giving a low-battery reminder, or controlling the engine to start for charging; The judgment conditions for judging which level of the weak HEV battery discharge capacity reminder signal BMS_LowSOP is met according to the detected battery temperature and discharge power parameters are as follows: BMS_LowSOP = 2, (Tbat ≤ -40°C and Pdch ≤ 6kw) or (-39°C ≤ Tbat ≤ -35°C and Pdch ≤ 5.5kw) or (-34°C ≤ Tbat ≤ -29°C and Pdch ≤ 4.5kw) or (-28°C ≤ Tbat ≤ -24°C and Pdch ≤ 4kw) or (-23°C ≤ Tbat ≤ -15°C and Pdch ≤ 3.5kw) or (-14°C ≤ Tbat ≤ -1°C and Pdch ≤ 2.5kw); BMS_LowSOP = 1, (Tbat ≤ -40°C and 6.5kw ≤ Pdch ≤ 8kw) or (-39°C ≤ Tbat ≤ -35°C and 5.5kw ≤ Pdch ≤ 6kw) or (-34°C ≤ Tbat ≤ -29°C and 4.5kw ≤ Pdch ≤ 5kw) or (-28°C ≤ Tbat ≤ -24°C and 3.5kw ≤ Pdch ≤ 4kw) or (-23°C ≤ Tbat ≤ -15°C and 2.5kw ≤ Pdch ≤ 3kw) or (-14°C ≤ Tbat ≤ 0°C and 1.5kw ≤ Pdch ≤ 2kw) or (1°C ≤ Tbat and Pdch ≤ 1kw); BMS_lowSOP = 0, that is, the parameter range not included in the above two levels 2 and 1; When it is determined that BMS_lowSOP = 0, directly put the whole vehicle to sleep; When it is determined that BMS_lowSOP ≠ 0, wake up the in-vehicle intelligent remote system to give a low-battery reminder, or control the engine to start for charging; When it is judged that BMS_lowSOP = 2, send a signal to the mobile terminal application to remind the user that the battery power is extremely low through the mobile terminal application, and then put the whole vehicle to sleep; When it is judged that BMS_lowSOP = 1, a signal is sent to the mobile terminal application, and a reminder to start the engine for charging is sent to the user through the mobile terminal application; at the same time, the engine starting conditions are judged, and when the conditions are met, the engine is controlled to start charging.

2. The HEV power battery discharge capacity monitoring method according to claim 1, wherein During the process of controlling the engine to start charging, the charging SOP is judged. When it is judged that the charging SOP ≥ 10kw, a signal is sent to the mobile terminal application, and the mobile terminal application is used to remind the user that the power battery has normal power, and then the whole vehicle is put to sleep.

3. The method for monitoring the discharging capacity of the HEV power battery according to claim 1 or 2, characterized in that, After sending a signal to the mobile terminal APP and reminding the user through the mobile terminal application, the set time t is continuously set, t = 0.5 - 1.5 minutes, and then the whole vehicle is put to sleep.

4. A HEV power battery discharge capacity monitoring system, characterized in that, The system is used to implement the HEV power battery discharge capacity monitoring method described in any one of claims 1-3, and includes an in-vehicle system of the HEV and an out-of-vehicle system of the HEV; The in-vehicle system of the HEV includes a high-voltage power battery of the HEV, a high-voltage ISG motor, a hybrid engine, and an in-vehicle intelligent remote system, which is used to monitor the battery discharge capacity status in real time after the user parks the vehicle, provide the minimum electrical energy required to start the engine, and transmit corresponding reminder signals; the out-of-vehicle system of the HEV includes a remote mobile terminal application that matches the functions of the in-vehicle intelligent remote system, which is used to remind the user of low battery and remotely control the engine start and stop functions.

5. The HEV power battery discharge capacity monitoring system according to claim 4, characterized in that The in-vehicle intelligent remote system conducts information interaction with the mobile remote terminal application through 4G / 5G network to achieve closed-loop control of remotely starting and stopping the engine of the vehicle.

6. A vehicle, characterized in that, The vehicle is equipped with the HEV power battery discharge capacity monitoring system described in claim 4 or 5.

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