An engine starting method of a hybrid vehicle, a vehicle controller, and a vehicle

Abstract

The application provides an engine starting method, a vehicle controller and a vehicle for a hybrid vehicle. The engine starting method comprises the following steps: obtaining battery information, DC / DC current information and engine information of the vehicle; inputting the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine information; determining a battery discharge current according to the battery information and a starting number of the engine; determining a target battery discharge current according to an actual battery discharge current in the battery information and the battery discharge current; and triggering a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter if the target battery discharge current, the DC / DC current information and the engine starting current meet a preset 12V starting condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid electric vehicles, in particular to an engine starting method for a hybrid electric vehicle, a vehicle controller and a vehicle. BACKGROUND

[0002] With the continuous development of new energy technology, hybrid electric vehicles are being used more and more widely, and the engine starting method of hybrid electric vehicles is also attracting more and more attention.

[0003] At present, the engine starting method of hybrid electric vehicles is mainly through the battery to start the engine; but relying on the battery to start the engine not only shortens the service life of the battery, but also has the problem of engine starting failure when the battery is low. SUMMARY

[0004] Therefore, the present application provides an engine starting method for a hybrid electric vehicle, a vehicle controller and a vehicle to improve the service life of the battery and avoid the problem of engine starting failure when the battery is low.

[0005] The first aspect of the present application provides an engine starting method for a hybrid electric vehicle, applied to a vehicle controller, the method comprising:

[0006] obtaining battery information, DC / DC current information and engine information of the vehicle;

[0007] inputting the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts the engine starting current according to the engine information;

[0008] determining the battery discharge current according to the battery information and the number of engine starts;

[0009] determining the target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current;

[0010] if the target battery discharge current, the DC / DC current information and the engine starting current meet the preset 12V starting condition, triggering the 12V starter on the vehicle to start the engine of the vehicle through the 12V starter.

[0011] Optionally, the engine information includes engine temperature and engine resistance torque, and the engine information is input into the engine starting current prediction model, so that the engine starting current prediction model predicts the engine starting current according to the engine information, comprising:

[0012] inputting the engine temperature and the engine resistance torque into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine temperature and the engine resistance torque;

[0013] The engine starting current prediction model is obtained by training a neural network using historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information.

[0014] Optionally, the engine starting current prediction model is obtained by training a neural network using historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information, comprising:

[0015] obtaining historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information at the same time;

[0016] calculating historical engine actual starting current according to the historical battery discharge current and the historical DC / DC current information;

[0017] inputting the historical engine temperature, the historical engine resistance torque and the historical engine actual starting current into the neural network;

[0018] predicting corresponding historical engine starting current according to the historical engine temperature and the historical engine resistance torque by using the neural network, adjusting parameters of the neural network until the neural network converges, and obtaining an engine starting current prediction model, with the historical engine starting current tending to the historical engine actual starting current as a training target.

[0019] Optionally, the historical DC / DC current information comprises historical DC / DC low-voltage end output current and historical DC / DC low-voltage load consumption current, and the historical engine actual starting current is calculated according to the historical battery discharge current and the historical DC / DC current information, comprising:

[0020] determining historical DC / DC actual supply current according to the historical DC / DC low-voltage end output current and the historical DC / DC low-voltage load consumption current;

[0021] calculating historical engine actual starting current according to the historical battery discharge current and the historical DC / DC actual supply current.

[0022] Optionally, the battery information comprises battery SOC and battery temperature, and the battery discharge current is determined according to the battery information and the number of engine starting times, comprising:

[0023] inputting the battery SOC, the battery temperature and the number of engine starts into a battery discharge current prediction model;

[0024] predicting, by using the battery discharge current prediction model, according to the battery SOC and the battery temperature, and correcting the prediction result of the battery discharge current prediction model by using the number of engine starts, to obtain a battery discharge current; wherein the battery discharge current prediction model is obtained by training a neural network by using historical battery SOC and historical battery temperature.

[0025] Optionally, the method further comprises:

[0026] determining an engine actual start current according to the target battery discharge current and the current information of the DC / DC;

[0027] determining a target engine start current according to the engine start current and a preset target value;

[0028] determining whether the engine actual start current is greater than the target engine start current;

[0029] if the engine actual start current is greater than the target engine start current, determining that the target battery discharge current, the current information of the DC / DC and the engine start current satisfy a preset 12V start condition;

[0030] if the engine actual start current is not greater than the target engine start current, determining that the target battery discharge current, the current information of the DC / DC and the engine start current do not satisfy the preset 12V start condition.

[0031] Optionally, the current information of the DC / DC includes an output current of a low-voltage end of the DC / DC and a low-voltage load consumption current of the DC / DC, and determining an engine actual start current according to the target battery discharge current and the current information of the DC / DC comprises:

[0032] determining a DC / DC actual supply current according to the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC;

[0033] calculating the engine actual start current according to the target battery discharge current and the DC / DC actual supply current.

[0034] Optionally, before triggering the 12V starter on the vehicle, the method further comprises:

[0035] real-time detecting whether a current working condition is a target working condition;

[0036] if the current working condition is a target working condition, generating an activation signal;

[0037] triggering a 12V starter on the vehicle based on the activation signal to start an engine of the vehicle by the 12V starter.

[0038] The second aspect of the present application provides a vehicle controller, comprising: a data acquisition module, an engine database module, a battery database module and a starting judgment module.

[0039] The data acquisition module is configured to acquire battery information of the vehicle, current information of the DC / DC and engine information.

[0040] The engine database module is configured to input the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine information.

[0041] The battery database module is configured to determine a battery discharge current according to the battery information and the number of engine starting times, and determine a target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current.

[0042] The starting judgment module is configured to trigger a 12V starter on the vehicle to start an engine of the vehicle by the 12V starter if the target battery discharge current, the current information of the DC / DC and the engine starting current meet a preset 12V starting condition.

[0043] The third aspect of the present application provides a vehicle comprising the vehicle controller provided in the second aspect of the present application.

[0044] The fourth aspect of the present application provides an electronic device, comprising: a processor and a memory, which are connected through a communication bus; wherein the processor is configured to call and execute a program stored in the memory; and the memory is configured to store a program, which is used to implement the engine starting method of the hybrid vehicle provided in the first aspect of the present application.

[0045] The fifth aspect of the present application provides a computer readable storage medium, which stores computer executable instructions for implementing the engine starting method of the hybrid vehicle provided in the first aspect of the present application.

[0046] This application provides an engine starting method, a vehicle controller, and a vehicle for a hybrid electric vehicle. The method, applied to the vehicle controller, acquires vehicle battery information, DC / DC current information, and engine information. Based on the engine information, it predicts the engine starting current using an engine starting current prediction model. It determines the battery discharge current based on the battery information and the number of engine starts. It determines the target battery discharge current based on the actual battery discharge current and the battery discharge current in the battery information. If the target battery discharge current, DC / DC current information, and engine starting current meet preset 12V starting conditions, it triggers the 12V starter motor on the vehicle to start the vehicle's engine. The technical solution provided by this invention accurately determines the battery discharge current, DC / DC current information, and the engine starting current required by the engine. It triggers the 12V starter motor on the vehicle when the target battery discharge current, DC / DC current information, and engine starting current meet a preset 12V starting condition. This not only effectively improves situations where low voltage fluctuations occur during engine starting or engine starting failure occurs when the battery is low, but also avoids affecting the low-voltage power supply, preventing controller restarts and malfunctions. Furthermore, starting the engine together with the DC / DC current information and the battery discharge current can extend the battery's lifespan. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0048] Figure 1 An engine starting system for a hybrid electric vehicle is provided as an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of a vehicle controller provided in an embodiment of the present invention;

[0050] Figure 3 A schematic flowchart of an engine starting method for a hybrid electric vehicle provided in an embodiment of the present invention;

[0051] Figure 4 A connection structure diagram of a vehicle controller, a DC / DC controller, a DC / DC low-voltage load, a 12V starter, an engine, a motor, a power coupling device, and wheels provided for an embodiment of the present invention;

[0052] Figure 5Another flowchart of an engine starting method of a hybrid vehicle is provided in the embodiments of the present application.

[0053] Figure 6 A structural diagram of an electronic device is provided in the embodiments of the present application. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0055] The term "comprising" and variations thereof as used in the present document are open-ended, that is, "comprising but not limited to". The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Related definitions of other terms will be given in the following description.

[0056] It should be noted that the concepts of "first", "second", etc. mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0057] It should be noted that the modification of "one" or "multiple" mentioned in the present disclosure is illustrative but not limiting, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0058] Referring to Figure 1 , a hybrid vehicle engine starting system provided by the embodiments of the present application is shown, which comprises an engine controller, a battery sensor, a DC / DC controller (for convenience, hereinafter referred to as DC / DC) and a vehicle controller.

[0059] The vehicle controller is connected to the engine controller, the battery sensor and the DC / DC, respectively.

[0060] Referring to Figure 2 , a structural diagram of a vehicle controller provided by the embodiments of the present application is shown, which comprises a data acquisition module, an engine database module, a battery database module, a starting judgment module and a starting function triggering module.

[0061] The data collection module is configured to acquire battery information, DC / DC current information and engine information of the vehicle.

[0062] The engine database module is configured to input the engine information into an engine start current prediction model, so that the engine start current prediction model predicts the engine start current according to the engine information.

[0063] The battery database module is configured to determine a battery discharge current according to the battery information and the number of engine starts, and determine a target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current.

[0064] The start judgment module is configured to trigger a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter if the target battery discharge current, the DC / DC current information and the engine start current meet a preset 12V starting condition.

[0065] Optionally, the engine information includes engine temperature and engine resistance torque, and the engine database module configured to input the engine information into the engine start current prediction model so that the engine start current prediction model predicts the engine start current according to the engine information, specifically configured to:

[0066] input the engine temperature and the engine resistance torque into the engine start current prediction model so that the engine start current prediction model predicts the engine start current according to the engine temperature and the engine resistance torque.

[0067] The engine start current prediction model is obtained by training a neural network using historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information.

[0068] Optionally, the engine database module configured to obtain the engine start current prediction model by training a neural network using historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information, specifically configured to:

[0069] The historical engine temperature, the historical engine resistance torque, the historical battery discharge current and the historical DC / DC current information at the same time are acquired; the historical engine actual starting current is calculated according to the historical battery discharge current and the historical DC / DC current information; the historical engine temperature, the historical engine resistance torque and the historical engine actual starting current are input into the neural network; the corresponding historical engine starting current is predicted according to the historical engine temperature and the historical engine resistance torque by using the neural network, and the parameters of the neural network are adjusted until the neural network reaches convergence, so as to obtain the engine starting current prediction model.

[0070] The historical DC / DC current information includes the output current of the historical DC / DC low-voltage end and the low-voltage load consumption current of the historical DC / DC.

[0071] Optionally, the engine database module for calculating the historical engine actual starting current according to the historical battery discharge current and the historical DC / DC current information is specifically used for:

[0072] The historical DC / DC actual supply current is determined according to the output current of the historical DC / DC low-voltage end and the low-voltage load consumption current of the historical DC / DC; and the historical engine actual starting current is calculated according to the historical battery discharge current and the historical DC / DC actual supply current.

[0073] Optionally, the battery information includes a battery SOC and a battery temperature, and the battery database module for determining the battery discharge current according to the battery information and the number of engine starts is specifically used for:

[0074] The battery SOC, the battery temperature and the number of engine starts are input into the battery discharge current prediction model; the battery discharge current is predicted according to the battery SOC and the battery temperature by using the battery discharge current prediction model, and the prediction result of the battery discharge current prediction model is corrected by using the number of engine starts, so as to obtain the battery discharge current; wherein the battery discharge current prediction model is obtained by training the neural network by using the historical battery SOC and the historical battery temperature.

[0075] Optionally, the starting judgment module is further used for:

[0076] The engine actual starting current is determined according to the battery discharge current and the current information of the DC / DC, the target engine starting current is determined according to the engine starting current and the preset target value, whether the engine actual starting current is greater than the target engine starting current is judged, the battery discharge current, the current information of the DC / DC and the engine starting current are determined to meet the preset 12V starting condition if the engine actual starting current is greater than the target engine starting current, and the battery discharge current, the current information of the DC / DC and the engine starting current are determined not to meet the preset 12V starting condition if the engine actual starting current is not greater than the target engine starting current.

[0077] The current information of the DC / DC includes the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC.

[0078] Optionally, the starting judgment module for determining the engine actual starting current according to the target battery discharge current and the current information of the DC / DC is specifically used for: determining the DC / DC actual supply current according to the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC; and calculating the engine actual starting current according to the target battery discharge current and the DC / DC actual supply current.

[0079] Optionally, the vehicle controller provided by the embodiment of the application further comprises a starting function triggering module.

[0080] The starting function triggering module is used for detecting whether the current working condition is the target working condition in real time.

[0081] If the current working condition is the target working condition, an activation signal is generated, and the generated activation signal is sent to the starting judgment module, so that the starting judgment module triggers the 12V starter on the vehicle to start the engine of the vehicle through the 12V starter based on the activation signal.

[0082] The application provides a vehicle controller, which obtains battery information, DC / DC current information and engine information of a vehicle; predicts an engine starting current according to the engine information through an engine starting current prediction model; determines a battery discharge current according to the battery information and the number of engine starting times; determines a target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current; triggers a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter if the target battery discharge current, the DC / DC current information and the engine starting current meet preset 12V starting conditions. The technical scheme provided by the application can accurately determine the battery discharge current of the battery, the DC / DC current information and the engine starting current currently required by the engine, and trigger the 12V starter on the vehicle when the target battery discharge current, the DC / DC current information and the engine starting current meet the preset 12V starting conditions, thereby effectively improving the situation that low-voltage fluctuation occurs during engine starting or engine starting failure occurs when the battery has low power, avoiding the influence on low-voltage power supply, causing the controller to restart and malfunction, and prolonging the service life of the battery by starting the engine through the DC / DC current information and the battery discharge current.

[0083] Based on the engine starting system and the vehicle controller of the hybrid electric vehicle shown in the above embodiments, the application provides an engine starting method of a hybrid electric vehicle, as shown in the figure. Figure 3 The engine starting method of the hybrid electric vehicle is applied to the vehicle controller in the engine starting system of the hybrid electric vehicle, and specifically includes the following steps:

[0084] S301: Obtain battery information, DC / DC current information and engine information of a vehicle.

[0085] In the embodiment of the application, the battery information of the battery on the vehicle can be collected in real time through a battery sensor, so that the battery information collected by the battery sensor is obtained through a data collection module, and the obtained battery information is transmitted to a battery database module, so that the battery data module stores the received battery information.

[0086] It should be noted that the battery information can include the battery SOC, the battery temperature and the actual battery discharge current of the battery.

[0087] In the embodiment of the present application, the engine information can be collected by the engine controller in real time, so as to obtain the engine information collected by the engine controller through the data collection module, and transmit the obtained engine information to the engine database module, so that the engine module stores the received engine information.

[0088] It should be noted that the engine information can include engine temperature and engine resistance torque.

[0089] In the embodiment of the present application, when the high voltage of the whole vehicle is high, the DC / DC can convert the high voltage of the whole vehicle into low voltage to supply power to each controller and battery on the vehicle; and the current information of the DC / DC can be collected through the DC / DC, so as to obtain the current information of the DC / DC collected by the DC / DC through the data collection module.

[0090] It should be noted that the current information of the DC / DC includes the output current of the low voltage end of the DC / DC and the low voltage load consumption current of the DC / DC. The low voltage load consumption current of the DC / DC is the sum of the power supply currents of each controller on the vehicle.

[0091] S302: input the engine information into the engine start current prediction model, so that the engine start current prediction model predicts the engine start current according to the engine information.

[0092] In the embodiment of the present application, the neural network can be trained in advance by using historical engine temperature, historical engine resistance torque, historical battery discharge current and historical current information of the DC / DC to obtain the engine start current prediction model.

[0093] It should be noted that the neural network (Artificial Neural Networks, ANNs) is a mathematical model that simulates the behavior characteristics of animal neural networks and performs distributed parallel information processing. The relationship between a large number of nodes inside can be adjusted to achieve the purpose of processing information, and has the ability of self-learning and self-adaptation.

[0094] Optionally, the engine database module can obtain historical engine temperature, historical engine resistance torque, historical battery discharge current and historical DC / DC current information at the same time; calculate the historical engine actual starting current according to the historical battery discharge current and the historical DC / DC current information; input the historical engine temperature, the historical engine resistance torque and the historical engine actual starting current into the neural network; use the neural network to predict the corresponding historical engine starting current according to the historical engine temperature and the historical engine resistance torque, and adjust the parameters of the neural network until the neural network converges, so as to obtain an engine starting current prediction model, with the historical engine starting current tending to the historical engine actual starting current as the training target.

[0095] The historical DC / DC current information includes the output current of the low-voltage end of the historical DC / DC and the low-voltage load consumption current of the historical DC / DC.

[0096] It should be noted that the historical DC / DC actual supply current is the actual current supplied by the DC / DC to the engine.

[0097] Optionally, the engine database module can determine the historical DC / DC actual supply current according to the output current of the low-voltage end of the historical DC / DC and the low-voltage load consumption current of the historical DC / DC; and calculate the historical engine actual starting current according to the historical battery discharge current and the historical DC / DC actual supply current.

[0098] In the embodiments of the present application, the difference between the output current of the low-voltage end of the historical DC / DC and the low-voltage load consumption current of the historical DC / DC can be calculated to obtain the historical DC / DC actual supply current; and the sum of the historical DC / DC actual supply current and the historical battery discharge current can be calculated to obtain the historical engine actual starting current.

[0099] In actual application, the historical engine starting current under different historical engine temperature and historical engine resistance torque can be fitted by using the neural network. As the number of engine starting times of the truck 12V starter increases, the cumulative value of the historical DC / DC actual supply current and the historical battery discharge current at the same time during the starting process of the truck 12V starter can be used as the historical engine actual starting current of the engine this time, and finally the historical engine actual starting current is used as the target value of the neural network. The parameters of the neural network are adjusted until the neural network converges, so as to obtain an engine starting current prediction model, so that a more accurate engine starting current can be predicted by using the engine starting current prediction model.

[0100] In the process of specifically executing step S302, after the engine temperature and the engine resistance torque are acquired, the engine database module can be used to predict the engine starting current according to the engine temperature and the engine resistance torque by using an engine starting current prediction model.

[0101] Optionally, the engine temperature and the engine resistance torque are input into the engine starting current prediction model by the engine database module, so that the engine starting current prediction model predicts the engine starting current according to the engine temperature and the engine resistance torque.

[0102] S303: determining the battery discharge current according to the battery information and the number of engine starts.

[0103] In the embodiments of the present application, the neural network can be trained in advance by using historical battery SOC and historical battery temperature to obtain a battery discharge current prediction model.

[0104] In actual application, the historical battery discharge current corresponding to the historical battery temperature and the battery SOC at different moments can be fitted by the battery database module by using the neural network, and the historical battery discharge current is corrected by using the number of engine starts at the moment, and the training target is to make the corrected historical battery discharge current approach the target battery discharge current at the corresponding moment, and the parameters of the neural network are adjusted until the neural network converges, and the battery discharge current prediction model is obtained.

[0105] It should be noted that the initial values of the battery SOC, the battery temperature and the battery discharge current in the battery database module are the initial values of the database from the battery factory data, and the initial value of the number of engine starts is 0.

[0106] It should be further noted that according to the number of engine starts, the battery life of the battery can be calculated, and the more the number of engine starts, the shorter the battery life of the battery, so the predicted battery discharge current is corrected by using the number of engine starts to improve the accuracy of the obtained battery discharge current.

[0107] In the process of specifically executing step S303, after the battery information is acquired, the data acquisition module can send the acquired battery information to the battery database module, so that the battery database module determines the battery discharge current according to the battery information and the number of engine starts by using the battery discharge current prediction model.

[0108] It should be noted that the battery information can include the battery SOC, the battery temperature and the actual battery discharge current.

[0109] Optionally, the battery database module inputs the battery SOC, the battery temperature and the number of engine starts into the battery discharge current prediction model; the battery discharge current prediction model is used to make a prediction according to the battery SOC and the battery temperature, and the number of engine starts is used to correct the prediction result of the battery discharge current prediction model, so as to obtain the battery discharge current.

[0110] In the embodiment, the battery discharge current is affected by the number of engine starts by the running 12V starter, so the correction coefficient corresponding to each number of engine starts can be determined according to the historical battery discharge current and the number of engine starts, so that when the battery discharge current prediction model is corrected by the number of engine starts in the subsequent prediction, the correction coefficient corresponding to the number of engine starts can be used to correct the prediction result of the battery discharge current prediction model, so that a more accurate battery discharge current can be obtained.

[0111] S304: determining the target battery discharge current according to the battery actual discharge current and the battery discharge current in the battery information.

[0112] In the process of specifically executing step S304, after the battery database module predicts the battery discharge current, it can further judge whether the battery discharge current is greater than the battery actual discharge current; if the battery discharge current is greater than the battery actual discharge current, the battery discharge current can be determined as the target battery discharge current.

[0113] If the battery discharge current is not greater than the battery actual discharge current, the battery actual discharge current can be determined as the target battery discharge current.

[0114] It should be noted that in the case that the battery discharge current is not greater than the battery actual discharge current, the battery database module can replace the predicted battery discharge current with the battery actual discharge current to complete the update of the data stored in the battery database, and at the same time, the replaced battery discharge current can be used as the historical battery discharge current to optimize the battery discharge current prediction model.

[0115] S305: judging whether the target battery discharge current, the current information of the DC / DC and the engine start current meet the preset 12V starting condition; if the target battery discharge current, the current information of the DC / DC and the engine start current do not meet the preset 12V starting condition, step S306 is executed; if the target battery discharge current, the current information of the DC / DC and the engine start current meet the preset 12V starting condition, step S307 is executed.

[0116] In the embodiment of the present application, the engine actual starting current can be determined by the starting judgment module according to the target battery discharge current and the current information of the DC / DC; the target engine starting current can be determined according to the engine starting current and the preset target value; it is determined whether the engine actual starting current is greater than the target engine starting current; if the engine actual starting current is greater than the target engine starting current, it is determined that the battery discharge current, the current information of the DC / DC and the engine starting current meet the preset 12V starting condition, and step S307 is performed; if the engine actual starting current is not greater than the target engine starting current, it is determined that the battery discharge current, the current information of the DC / DC and the engine starting current do not meet the preset 12V starting condition, and step S306 is performed.

[0117] It should be noted that the corresponding preset target value can be set in advance, so as to add the determined engine starting current and the preset target value to obtain the target engine starting current, thereby avoiding the situation of reducing the redundant value of the voltage setting. For example, the preset target value can be 8A, 10A, 11A, etc., which can be set according to actual application, and the embodiment of the present application is not limited.

[0118] In the embodiment of the present application, the current information of the DC / DC includes the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC.

[0119] Optionally, the DC / DC actual supply current can be determined according to the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC; the engine actual starting current can be calculated according to the target battery discharge current and the DC / DC actual supply current.

[0120] In the embodiment of the present application, the difference between the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC can be calculated to obtain the DC / DC actual supply current; the sum of the DC / DC actual supply current and the battery discharge current can be calculated to obtain the engine actual starting current.

[0121] S306: Inhibit triggering the 12V starter.

[0122] In the process of specifically performing S306, the starting judgment module inhibits triggering the 12V starter in the case that the battery discharge current, the output current of the low-voltage end of the DC / DC and the engine starting current do not meet the preset 12V starting condition, to prevent starting the engine of the vehicle by the 12V starter.

[0123] In actual application, if the actual engine starting current is not greater than the target engine starting current, it indicates that the discharging capacity of the current battery and the discharging capacity of the DC / DC controller are low, and if the engine of the vehicle is started by the 12V starter, low voltage fluctuation or engine starting failure may occur during the starting process, and the low voltage supply may also be affected, causing the controller to restart and malfunction. Therefore, in the case where the actual engine starting current is not greater than the target engine starting current, triggering the 12V starter is prohibited to prevent the engine of the vehicle from being started by the 12V starter.

[0124] S307: Triggering the 12V starter on the vehicle to start the engine of the vehicle by the 12V starter.

[0125] In the process of specifically executing step S307, the starting judgment module triggers the 12V starter on the vehicle to start the engine of the vehicle by the 12V starter in the case where the battery discharging current, the output current of the DC / DC low voltage end and the engine starting current meet the preset 12V starting condition.

[0126] In actual application, if the actual engine starting current is greater than the target engine starting current, it indicates that the discharging capacity of the current battery and the discharging capacity of the DC / DC controller are sufficient to start the engine, and at this time, the 12V starter on the vehicle can be triggered to start the engine of the vehicle by the 12V starter, thereby avoiding low voltage fluctuation or engine starting failure during the engine starting process, and avoiding affecting the low voltage supply, causing the controller to restart and malfunction.

[0127] Further, in the embodiment of the application, after the vehicle controller triggers the 12V starter on the vehicle, the engine can be started by the 12V starter to start the motor, so that the motor drives the wheels to run through the power coupling device, thereby achieving the purpose of normal driving of the vehicle. The connection structure of the vehicle controller, the DC / DC controller, the DC / DC low voltage load, the 12V starter, the engine, the motor, the power coupling device and the wheels is as shown in Figure 4 .

[0128] It should be noted that, referring to Figure 4 , the vehicle controller, the DC / DC controller, the DC / DC low voltage load, the 12V starter and the power battery are parallel circuits, and the negative pole is connected to the ground. The engine, the motor, the power coupling device and the wheels are series circuits.

[0129] The application provides an engine starting method of a hybrid vehicle, which is applied to a vehicle controller, and the engine starting method comprises the following steps: obtaining battery information, DC / DC current information and engine information of the vehicle; predicting an engine starting current according to the engine information through an engine starting current prediction model; determining a battery discharge current according to the battery information and the number of engine starting times; determining a target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current; triggering a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter if the target battery discharge current, the DC / DC current information and the engine starting current meet preset 12V starting conditions. The technical scheme provided by the application can accurately determine the battery discharge current of the battery, the DC / DC current information and the engine starting current currently required by the engine, and trigger the 12V starter on the vehicle when the target battery discharge current, the DC / DC current information and the engine starting current meet the preset 12V starting conditions, so that the situation that low voltage fluctuation occurs during the engine starting process or the situation that the engine starting fails when the battery has low power can be effectively improved, the influence on low-voltage power supply can be avoided to cause the controller to restart and malfunction, and the service life of the battery can be prolonged by starting the engine through the DC / DC current information and the battery discharge current.

[0130] Further, refer to Figure 5 , which shows a flowchart of another engine starting method of a hybrid vehicle provided by the embodiment of the application. The engine starting method of the hybrid vehicle is applied to a vehicle controller in an engine starting system of the hybrid vehicle, and the engine starting method of the hybrid vehicle specifically comprises the following steps:

[0131] S501: obtaining battery information, DC / DC current information and engine information of the vehicle.

[0132] S502: inputting the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine information.

[0133] S503: determining a battery discharge current according to the battery information and the number of engine starting times.

[0134] S504: determining a target battery discharge current according to the actual battery discharge current in the battery information and the battery discharge current.

[0135] S505: Determine whether the target battery discharge current, the current information of the DC / DC and the engine starting current meet the preset 12V starting condition; if the target battery discharge current, the current information of the DC / DC and the engine starting current meet the preset 12V starting condition, execute step S506; if the target battery discharge current, the current information of the DC / DC and the engine starting current do not meet the preset 12V starting condition, execute step S507.

[0136] In the specific execution of steps S501 to S505, the specific execution process and implementation principle of steps S501 to S505 are the same as the specific execution process and implementation principle of steps S301 to S305 shown in the above Figure 3 , and the corresponding parts can be referred to in the above Figure 3 , which will not be described here in detail.

[0137] S506: Real-time detect whether the current working condition is the target working condition; if the current working condition is not the target working condition, execute step S507; if the current working condition is the target working condition, execute step 508.

[0138] In the specific execution of step S506, under the condition that the battery discharge current, the current information of the DC / DC and the engine starting current meet the preset 12V starting condition, it can be further determined whether the current working condition of the vehicle is the target working condition; if the current working condition is not the target working condition, execute step S507; if the current working condition is the target working condition, execute step 508.

[0139] It should be noted that the target working condition can be that the accelerator pedal opening degree of the vehicle is greater than 90 degrees, or the P2 motor fails to start the engine 3 times, etc.

[0140] S507: Inhibit triggering the 12V starter.

[0141] In the specific execution of step S507, under the condition that the battery discharge current, the current information of the DC / DC and the engine starting current do not meet the preset 12V starting condition, or the current working condition is not the target working condition, the 12V starter can be inhibited from being triggered.

[0142] S508: Generate an activation signal, and trigger the 12V starter on the vehicle based on the activation signal to start the engine of the vehicle through the 12V starter.

[0143] In the embodiment of the present application, the activation signal is generated in the case that the target battery discharge current, the current information of the DC / DC and the engine starting current meet the preset 12V starting condition and the current working condition is the target working condition, and the 12V starter on the vehicle is triggered based on the activation signal to start the engine of the vehicle through the 12V starter, so that the low voltage fluctuation in the engine starting process or the engine starting failure in the case that the battery power is low can be effectively avoided, and the influence on the low-voltage power supply, the controller restart and the fault can also be avoided.

[0144] The embodiment of the present application provides a vehicle, and the vehicle comprises the engine starting system and the vehicle controller of the hybrid vehicle in the above embodiment.

[0145] The embodiment of the present application provides an electronic device, such as Figure 6 As shown in the figure, the electronic device comprises a processor 601 and a memory 602, the memory 602 is used for storing the program code and data of the engine starting method of the hybrid vehicle, and the processor 601 is used for calling the program instructions in the memory to execute the steps shown in the engine starting method of the hybrid vehicle in the above embodiment.

[0146] The embodiment of the present application provides a storage medium, and the storage medium comprises a storage program, wherein, when the program runs, the device where the storage medium is located executes the engine starting method of the hybrid vehicle shown in the above embodiment.

[0147] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts of each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. Especially, for the system or system embodiment, since it is basically similar to the method embodiment, it is described more simply, and the related parts can be referred to the part of the method embodiment. The system and system embodiment described above are only schematic, and the units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to the actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0148] Those skilled in the art will further appreciate that the units and algorithms described in connection with the examples disclosed herein can be embodied directly in hardware, in software, or in a combination of the two. For the sake of brevity, descriptions of a functional nature will generally be used throughout this disclosure to describe the various examples. Those skilled in the art will appreciate that the functionality described can be implemented in either hardware or software, or a combination of the two. Depending upon the particular application, the implementation of the described functionality can vary. Those skilled in the art will recognize the interchangeability of hardware and software under these circumstances, and will appreciate the various ways in which software might be implemented in a particular application. Those skilled in the art will also appreciate that the various forgoing examples are illustrative in nature, and are not intended to limit the scope, applicability, or configuration of the claimed application in any manner. Various changes can be made in the function and arrangement of elements without departing from the scope of the claimed application.

[0149] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0150] The preferred embodiments of the present application have been disclosed above. A person of ordinary skill in the art will be able to make various modifications and improvements without departing from the spirit of the present application. These modifications and improvements also should be considered within the scope of the present application.

Claims

1. An engine starting method for a hybrid vehicle, characterized by, The method is applied to a vehicle controller, and comprises the following steps: Obtaining battery information, DC / DC current information and engine information of a vehicle; Inputting the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine information; Determining a battery discharge current according to the battery information and the number of engine starts; Determining a target battery discharge current according to an actual battery discharge current in the battery information and the battery discharge current; If the target battery discharge current, the DC / DC current information and the engine starting current meet preset 12V starting conditions, triggering a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter; The engine information comprises an engine temperature and an engine resistance torque, and inputting the engine information into the engine starting current prediction model so that the engine starting current prediction model predicts an engine starting current according to the engine information comprises: Inputting the engine temperature and the engine resistance torque into the engine starting current prediction model so that the engine starting current prediction model predicts an engine starting current according to the engine temperature and the engine resistance torque; The engine starting current prediction model is obtained by training a neural network using historical engine temperatures, historical engine resistance torques, historical battery discharge currents and historical DC / DC current information.

2. The method of claim 1, wherein, The engine starting current prediction model is obtained by training a neural network using historical engine temperatures, historical engine resistance torques, historical battery discharge currents and historical DC / DC current information, which comprises the following steps: Obtaining historical engine temperatures, historical engine resistance torques, historical battery discharge currents and historical DC / DC current information at the same time; Calculating a historical engine actual starting current according to the historical battery discharge current and the historical DC / DC current information; Inputting the historical engine temperature, the historical engine resistance torque and the historical engine actual starting current into the neural network; Using the neural network to predict a corresponding historical engine starting current according to the historical engine temperature and the historical engine resistance torque, and adjusting parameters of the neural network until the neural network converges, so as to obtain an engine starting current prediction model.

3. The method of claim 2, wherein, The historical DC / DC current information comprises a historical DC / DC low-voltage end output current and a historical DC / DC low-voltage load consumption current, and calculating a historical engine actual starting current according to the historical battery discharge current and the historical DC / DC current information comprises: Determining a historical DC / DC actual supply current according to the historical DC / DC low-voltage end output current and the historical DC / DC low-voltage load consumption current; According to the historical battery discharge current and the historical DC / DC actual supply current, a historical engine actual starting current is calculated.

4. The method of claim 1, wherein, The battery information includes a battery SOC and a battery temperature, and the battery discharge current is determined according to the battery information and the number of engine starts, including: The battery SOC, the battery temperature and the number of engine starts are input into a battery discharge current prediction model; The battery discharge current is predicted according to the battery SOC and the battery temperature by using the battery discharge current prediction model, and the prediction result of the battery discharge current prediction model is corrected by using the number of engine starts, so as to obtain the battery discharge current; wherein the battery discharge current prediction model is obtained by training a neural network by using historical battery SOC and historical battery temperature.

5. The method of claim 1, wherein, The method further includes: According to the target battery discharge current and the current information of the DC / DC, an engine actual starting current is determined; According to the engine starting current and a preset target value, a target engine starting current is determined; It is judged whether the engine actual starting current is greater than the target engine starting current; If the engine actual starting current is greater than the target engine starting current, it is determined that the target battery discharge current, the current information of the DC / DC and the engine starting current meet a preset 12V starting condition; If the engine actual starting current is not greater than the target engine starting current, it is determined that the target battery discharge current, the current information of the DC / DC and the engine starting current do not meet the preset 12V starting condition.

6. The method of claim 5, wherein, The current information of the DC / DC includes an output current of a low-voltage end of the DC / DC and a low-voltage load consumption current of the DC / DC, and according to the target battery discharge current and the current information of the DC / DC, an engine actual starting current is determined, including: According to the output current of the low-voltage end of the DC / DC and the low-voltage load consumption current of the DC / DC, a DC / DC actual supply current is determined; According to the target battery discharge current and the DC / DC actual supply current, an engine actual starting current is calculated.

7. The method of claim 1, wherein, Before triggering the 12V starter on the vehicle, the method further includes: Real-time detection is performed on whether a current working condition is a target working condition; If the current working condition is the target working condition, an activation signal is generated; Based on the activation signal, the 12V starter on the vehicle is triggered to start the engine of the vehicle by the 12V starter.

8. A vehicle control unit, characterized by, The vehicle controller includes a data acquisition module, an engine database module, a battery database module and a starting judgment module; The data acquisition module is used to acquire battery information of the vehicle, current information of the DC / DC and engine information; The engine database module is used to input the engine information into an engine starting current prediction model, so that the engine starting current prediction model predicts an engine starting current according to the engine information; The battery discharge current prediction model is obtained by training a neural network by using historical battery SOC and historical battery temperature. The battery database module is configured to determine a battery discharge current according to the battery information and the number of engine starts, and determine a target battery discharge current according to an actual battery discharge current in the battery information and the battery discharge current; The start judgment module is configured to trigger a 12V starter on the vehicle to start the engine of the vehicle through the 12V starter if the target battery discharge current, the current information of the DC / DC and the engine start current meet a preset 12V starting condition. The engine information includes an engine temperature and an engine resistance torque, and the engine information is input into an engine start current prediction model, so that the engine start current prediction model predicts the engine start current according to the engine information. The engine temperature and the engine resistance torque are input into an engine start current prediction model, so that the engine start current prediction model predicts the engine start current according to the engine temperature and the engine resistance torque. The engine start current prediction model is obtained by training a neural network using historical engine temperatures, historical engine resistance torques, historical battery discharge currents and historical current information of the DC / DC.

9. A vehicle characterized by comprising: The vehicle controller of claim 8 is included.

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