A hybrid vehicle starting control method and device, and a hybrid vehicle

Abstract

The application discloses a hybrid vehicle starting control method and device and a hybrid vehicle. The method comprises the following steps: obtaining preset starting parameters when a motor reverse drives an engine, wherein the preset starting parameters comprise a preset motor reverse driving speed, a preset motor reverse driving engine exit rotating speed and a preset engine starting fuel injection amount; starting the motor reverse driving engine function according to the preset starting parameters, and determining an engine starting state; when the engine starting is successful, the starting is completed and the method is exited; when the engine starting fails, the method enters a motor reverse driving self-learning mode, and starting adjustment parameters are determined according to the preset starting parameters; the motor reverse driving engine function is started again according to the starting adjustment parameters until the engine starting is successful. When the motor reverse driving engine fails, the motor reverse driving self-learning mode is entered, starting adjustment parameters are generated, and the starting success rate of the motor reverse driving engine is ensured.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a hybrid vehicle start-up control method, device, and hybrid vehicle. Background Technology

[0002] Currently, with the promotion of new energy vehicles, the application of range-extended electric vehicles is becoming increasingly widespread. Range-extended electric vehicles refer to pure electric vehicles with the addition of a range extender, which is a system consisting of an engine and an electric motor. This system charges the vehicle's battery or directly drives the motor to increase the driving range, thus overcoming the limitation of pure electric vehicles in terms of driving range.

[0003] Currently, hybrid vehicles have begun to use electric motors to tow the engine for starting. However, when the motor fails to start, the starting torque is usually simply changed to try to start the vehicle successfully without identifying the cause of the starting difficulty, such as the engine not injecting fuel. Furthermore, the starting process is affected not only by the starting torque, but also by various other factors such as the rate of change of the motor torque and the duration of the motor torque being maintained during the starting process. Summary of the Invention

[0004] This invention provides a hybrid vehicle start-up control method, device, and hybrid vehicle to improve the environmental adaptability of the motor-driven reverse drive and increase the success rate of reverse towing.

[0005] In a first aspect, the present invention provides a hybrid vehicle start-up control method, the hybrid vehicle start-up control method comprising:

[0006] Acquire preset starting parameters when the motor is reversing the engine, the preset starting parameters including preset motor reversing speed, preset motor reversing engine exit speed and preset engine start fuel injection quantity;

[0007] The motor is activated to reverse-drive the engine according to the preset start parameters, and the engine start status is determined.

[0008] When the engine starts successfully, the startup process is complete and the process ends.

[0009] When the engine fails to start, it enters the motor reverse drag self-learning mode and determines the start adjustment parameters according to the preset start parameters. The start adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0010] Restart the motor-driven engine function according to the startup adjustment parameters until the engine starts successfully.

[0011] Optionally, after entering the motor reverse self-learning mode, the following are also included:

[0012] Determine the engine start mode, wherein the engine start mode includes a low-temperature cold start mode and a normal-temperature start mode;

[0013] Determining the startup adjustment parameters based on the preset startup parameters includes:

[0014] The start adjustment parameters are determined based on the engine start mode and the preset start parameters.

[0015] Optionally, before determining the engine start mode, the following may also be included:

[0016] Obtain engine coolant temperature, ambient temperature, and ambient pressure values;

[0017] Obtain preset engine coolant temperature, preset ambient temperature, and preset ambient pressure values.

[0018] Optionally, determine the engine start mode, including:

[0019] When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode.

[0020] When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be a low-temperature cold start mode.

[0021] Optionally, the motor reverse speed adjustment value includes a first motor reverse speed adjustment value and a second motor reverse speed adjustment value; the motor reverse engine exit speed adjustment value includes a first motor reverse engine exit speed adjustment value and a second motor reverse engine exit speed adjustment value; the engine initial fuel injection quantity adjustment value includes a first engine initial fuel injection quantity adjustment value and a second engine initial fuel injection quantity adjustment value; the first motor reverse speed adjustment value is greater than the preset motor reverse speed, the preset motor reverse speed is greater than the second motor reverse speed adjustment value, the first motor reverse engine exit speed adjustment value is less than the preset motor reverse engine exit speed, the preset motor reverse engine exit speed is less than the second motor reverse engine exit speed adjustment value, the first engine initial fuel injection quantity adjustment value is less than the preset engine initial fuel injection quantity, and the preset engine initial fuel injection quantity is less than the second engine initial fuel injection quantity adjustment value;

[0022] Determining the startup adjustment parameters based on the preset startup parameters includes:

[0023] When the engine start mode is normal temperature start mode, the adjustment value of the first motor reverse speed, the adjustment value of the first motor reverse engine exit speed, and the adjustment value of the first engine start fuel injection quantity are determined according to the preset start parameters.

[0024] Optionally, determining the startup adjustment parameters based on the preset startup parameters further includes:

[0025] When the engine start mode is low temperature cold start mode, the adjustment value of the second motor reverse speed, the adjustment value of the second motor reverse engine exit speed, and the adjustment value of the second engine start fuel injection quantity are determined according to the preset start parameters.

[0026] Optionally, after restarting the motor-assisted reverse engine function according to the aforementioned start-up adjustment parameters, the function further includes:

[0027] When the engine starts successfully again, the start adjustment parameters are updated and stored as the preset start parameters, then the start-up process is complete and the engine exits.

[0028] Optional, also includes:

[0029] If the engine fails to start again, the starting adjustment parameters are updated and stored as the preset starting parameters, and the number of starts is obtained.

[0030] Get the preset number of launches;

[0031] When the number of starts is less than the preset number of starts, the motor reverse self-learning mode is entered again;

[0032] When the number of starts is greater than or equal to the preset number of starts, an engine start fault information is output.

[0033] Secondly, the present invention provides a hybrid vehicle start-up control device, which performs the hybrid vehicle start-up control method comprising any one of the first aspects, the hybrid vehicle start-up control device comprising:

[0034] A module for acquiring preset starting parameters when the motor is reversing and towing the engine is used to acquire preset starting parameters when the motor is reversing and towing the engine. The preset starting parameters include preset motor reversing speed, preset motor reversing and engine exit speed, and preset engine starting fuel injection quantity.

[0035] The motor-driven engine function start-up and engine start-up status determination module is used to start the motor-driven engine function according to the preset start-up parameters and determine the engine start-up status.

[0036] The startup completion module is used to complete the startup and exit when the engine starts successfully;

[0037] The startup adjustment parameter determination module is used to enter the motor reverse drag self-learning mode when the engine fails to start, and determine the startup adjustment parameters according to the preset startup parameters. The startup adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0038] The motor-driven engine restart module is used to restart the motor-driven engine function according to the start adjustment parameters until the engine starts successfully.

[0039] Thirdly, the present invention provides a hybrid vehicle, including the hybrid vehicle start-up control device described in the second aspect.

[0040] The technical solution of this invention provides a hybrid vehicle start-up control method, which includes: acquiring preset start-up parameters for motor-assisted engine reversing, the preset start-up parameters including a preset motor reversing speed, a preset motor reversing engine exit speed, and a preset engine initial fuel injection quantity; starting the motor-assisted engine reversing function according to the preset start-up parameters and determining the engine start-up status; when the engine starts successfully, the start-up is completed and exited; when the engine starts unsuccessfully, a motor reversing self-learning mode is entered, and start-up adjustment parameters are determined according to the preset start-up parameters, including a motor reversing speed adjustment value, a motor reversing engine exit speed adjustment value, and an engine initial fuel injection quantity adjustment value; the motor reversing engine reversing function is restarted according to the start-up adjustment parameters until the engine starts successfully. By entering the motor reversing self-learning mode when the motor reversing engine fails and generating start-up adjustment parameters, the success rate of motor-assisted engine reversing start-up is guaranteed.

[0041] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A flowchart illustrating a hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0044] Figure 2A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0045] Figure 3 A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0046] Figure 4 A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0047] Figure 5 A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0048] Figure 6 A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0049] Figure 7 A schematic flowchart of another hybrid vehicle start-up control method provided in an embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of a hybrid vehicle start-up control device provided in an embodiment of the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] Figure 1This is a flowchart illustrating a hybrid vehicle start-up control method according to an embodiment of the present invention. This embodiment is applicable to hybrid vehicle start-up control situations. The method can be executed by a hybrid vehicle start-up control device, which can be implemented in hardware and / or software and can be configured in the vehicle. Figure 1 As shown, the method includes:

[0054] S101, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0055] The preset starting parameters can be set according to actual design requirements, and this embodiment of the invention does not impose specific limitations. The preset starting parameters can be those for successful motor-driven engine start-up under normal temperature conditions. These preset starting parameters include a preset motor-driven speed, a preset motor-driven engine exit speed, and a preset engine fuel injection quantity. The motor-driven engine stops reversing when its speed reaches the preset motor-driven engine exit speed.

[0056] S102, start the motor towing engine function according to the preset start parameters, and determine the engine start status.

[0057] When the driver turns the key to start the vehicle, the motor can be activated to reverse the engine according to preset starting parameters, thereby determining the engine starting status, which includes successful engine start and engine starting failure.

[0058] S103: When the engine starts successfully, the start-up process is complete and the process exits.

[0059] When the engine starts successfully, it is considered that the motor has successfully started the engine by pulling it backwards, and the startup process is considered complete and the process ends.

[0060] S104 When the engine fails to start, it enters the motor reverse drag self-learning mode and determines the start adjustment parameters according to the preset start parameters. The start adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0061] When the engine fails to start, it is considered that the motor has failed to drive the engine in reverse. The system then enters the motor reverse driving self-learning mode, adjusts the preset starting parameters accordingly to generate starting adjustment parameters, and uses these parameters to drive the engine in reverse again to determine the engine starting status.

[0062] S105, restart the motor reverse engine function according to the start adjustment parameters until the engine starts successfully.

[0063] After entering the motor-driven reverse self-learning mode, the motor-driven reverse engine function can be restarted using the generated start adjustment parameters. The motor can be entered and exited multiple times to achieve precise adjustment of the start adjustment parameters until the engine starts successfully.

[0064] This invention employs a method to acquire preset starting parameters for a motor-driven engine in reverse; activate the motor-driven engine function according to these preset parameters and determine the engine's starting status; if the engine starts successfully, the startup process is complete and exits; if the engine fails to start, the system enters a motor-driven engine self-learning mode and determines starting adjustment parameters based on the preset starting parameters; the system then restarts the motor-driven engine function according to these adjustment parameters until the engine starts successfully. By entering the motor-driven engine self-learning mode and generating starting adjustment parameters when the motor-driven engine fails to start, the success rate of starting the motor-driven engine in reverse is ensured.

[0065] Optional, Figure 2 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes:

[0066] S201, Obtain the preset starting parameters when the motor is reversing the engine. The preset starting parameters include the preset motor reversing speed, the preset motor reversing engine exit speed, and the preset engine starting fuel injection quantity.

[0067] S202, start the motor towing the engine function according to the preset start parameters, and determine the engine start status.

[0068] S203: When the engine starts successfully, the start-up process is complete and the process ends.

[0069] S204: When the engine fails to start, it enters the electric motor reverse-dragging self-learning mode.

[0070] S205, determine the engine start mode, which includes low temperature cold start mode and normal temperature start mode.

[0071] S206 determines the starting adjustment parameters based on the engine starting mode and preset starting parameters. The starting adjustment parameters include the motor reverse speed adjustment value, the motor reverse engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0072] The engine start mode can include a low-temperature cold start mode and a normal-temperature start mode. It can make judgments based on the engine coolant temperature and the engine's environment, so as to automatically adjust and generate start adjustment parameters according to the engine start mode, thereby improving the engine start success rate when the motor is pulling the engine.

[0073] S207, restart the motor reverse engine function according to the start adjustment parameters until the engine starts successfully.

[0074] This invention embodiment acquires preset starting parameters for motor-driven engine reversing; activates the motor-driven engine reversing function according to the preset starting parameters and determines the engine starting status; when the engine starts successfully, the startup process is completed and exits; when the engine fails to start, it enters a motor-driven engine reversing self-learning mode; determines the engine starting mode; determines starting adjustment parameters based on the engine starting mode and preset starting parameters; and restarts the motor-driven engine reversing function according to the starting adjustment parameters until the engine starts successfully. By entering the motor-driven engine reversing self-learning mode when the motor-driven engine reversing fails and generating starting adjustment parameters based on the engine starting mode, the success rate of motor-driven engine reversing startup is guaranteed.

[0075] Optional, Figure 3 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the method includes:

[0076] S301, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0077] S302, start the motor to reverse the engine function according to the preset start parameters, and determine the engine start status.

[0078] S303: When the engine starts successfully, the start-up process is complete and the process ends.

[0079] S304: When the engine fails to start, it enters the electric motor reverse-dragging self-learning mode.

[0080] S305 obtains engine coolant temperature, ambient temperature, and ambient pressure values.

[0081] Among them, the real-time acquisition of engine coolant temperature, ambient temperature, and ambient pressure values ​​can be obtained using sensors to determine the subsequent engine start-up mode.

[0082] S306, obtain the preset engine coolant temperature value, preset ambient temperature value, and preset ambient pressure value.

[0083] The preset engine coolant temperature, preset ambient temperature, and preset ambient pressure values ​​can be set according to actual design requirements, and the embodiments of the present invention do not impose specific limitations.

[0084] S307 determines the engine start mode based on engine coolant temperature, ambient temperature, ambient pressure, preset engine coolant temperature, preset ambient temperature, and preset ambient pressure. The engine start mode includes a low-temperature cold start mode and a normal-temperature start mode.

[0085] The engine start mode is determined by comparing the engine coolant temperature with the preset engine coolant temperature, the ambient temperature with the preset ambient temperature, and the ambient pressure with the preset ambient pressure.

[0086] S308 determines the starting adjustment parameters based on the engine starting mode and preset starting parameters. The starting adjustment parameters include the motor reverse speed adjustment value, the motor reverse engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0087] S309, restart the motor reverse engine function according to the start adjustment parameters until the engine starts successfully.

[0088] This invention acquires engine coolant temperature, ambient temperature, and ambient pressure values; acquires preset engine coolant temperature, preset ambient temperature, and preset ambient pressure values; and determines the engine start mode based on these values. The engine start mode includes a low-temperature cold start mode and a normal-temperature start mode. The engine start mode is determined by the changes in engine coolant temperature, ambient temperature, and ambient pressure values, so that subsequent start adjustment parameters can be automatically adjusted based on the engine start mode to ensure a high success rate of engine start when the motor drives the engine.

[0089] Optional, Figure 4 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the method includes:

[0090] S401, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0091] S402, start the motor towing the engine function according to the preset start parameters, and determine the engine start status.

[0092] S403: When the engine starts successfully, the start-up process is complete and the engine exits.

[0093] S404: When the engine fails to start, it enters the electric motor reverse-dragging self-learning mode.

[0094] S405 obtains engine coolant temperature, ambient temperature, and ambient pressure values.

[0095] S406, obtain the preset engine coolant temperature value, preset ambient temperature value, and preset ambient pressure value.

[0096] S407: When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode.

[0097] Specifically, when the engine coolant temperature, ambient temperature, and ambient pressure are all greater than or equal to preset values, the engine is considered to be in a normal temperature environment, and the engine starting mode is determined to be the normal temperature starting mode. This allows for the determination of the first starting adjustment parameter based on the normal temperature starting mode and the preset starting parameters.

[0098] S408: When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be the low temperature cold start mode.

[0099] Specifically, when the engine coolant temperature, ambient temperature, and ambient pressure are all lower than preset values, the engine is considered to be in a low-temperature environment, and the engine starting mode is determined to be a low-temperature cold start mode. This allows for the determination of a second starting adjustment parameter that corresponds to the low-temperature cold start mode and preset starting parameters. The first and second starting adjustment parameters differ to ensure a higher success rate for engine starting under different conditions.

[0100] S409 determines the starting adjustment parameters based on the normal temperature start mode, low temperature cold start mode, and preset start parameters. The starting adjustment parameters include the motor reverse speed adjustment value, the motor reverse engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0101] The starting adjustment parameters include a first starting adjustment parameter and a second starting adjustment parameter. The first starting adjustment parameter includes the adjustment value of the first motor's reverse towing speed, the adjustment value of the first motor's reverse towing engine exit speed, and the adjustment value of the first engine's initial fuel injection quantity. The second starting adjustment parameter includes the adjustment value of the second motor's reverse towing speed, the adjustment value of the second motor's reverse towing engine exit speed, and the adjustment value of the second engine's initial fuel injection quantity.

[0102] S410, restart the motor reverse engine function according to the start adjustment parameters until the engine starts successfully.

[0103] This invention determines the engine starting mode as a normal temperature start mode when the engine coolant temperature, ambient temperature, and ambient pressure are all greater than or equal to a preset value; and determines the engine starting mode as a low temperature cold start mode when the engine coolant temperature, ambient temperature, and ambient pressure are all less than a preset value. Starting adjustment parameters are determined based on the normal temperature start mode, the low temperature cold start mode, and preset starting parameters to ensure a high engine starting success rate under different environments when the motor is pulling the engine.

[0104] Optionally, the motor reverse speed adjustment value includes a first motor reverse speed adjustment value and a second motor reverse speed adjustment value; the motor reverse engine exit speed adjustment value includes a first motor reverse engine exit speed adjustment value and a second motor reverse engine exit speed adjustment value; the engine initial fuel injection quantity adjustment value includes a first engine initial fuel injection quantity adjustment value and a second engine initial fuel injection quantity adjustment value; the first motor reverse speed adjustment value is greater than the preset motor reverse speed, the preset motor reverse speed is greater than the second motor reverse speed adjustment value, the first motor reverse engine exit speed adjustment value is less than the preset motor reverse engine exit speed, the preset motor reverse engine exit speed is less than the second motor reverse engine exit speed adjustment value, the first engine initial fuel injection quantity adjustment value is less than the preset engine initial fuel injection quantity, and the preset engine initial fuel injection quantity is less than the second engine initial fuel injection quantity adjustment value; Figure 5 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the method includes:

[0105] S501, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0106] S502, starts the motor towing engine function according to preset start parameters and determines the engine start status.

[0107] S503: When the engine starts successfully, the start-up process is complete and the engine exits.

[0108] S504: When the engine fails to start, it enters the electric motor reverse-drive self-learning mode.

[0109] S505 obtains engine coolant temperature, ambient temperature, and ambient pressure values.

[0110] S506, obtains the preset engine coolant temperature value, preset ambient temperature value, and preset ambient pressure value.

[0111] S507: When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode.

[0112] S508, when the engine start mode is normal temperature start mode, determines the adjustment value of the first motor reverse speed, the adjustment value of the first motor reverse engine exit speed, and the adjustment value of the first engine start fuel injection quantity according to the preset start parameters.

[0113] Specifically, when the engine's pre-automatic mode is the normal temperature start mode, the first motor reverse speed adjustment value is gradually increased based on the preset motor reverse speed, the first motor reverse speed adjustment value is gradually decreased based on the preset motor reverse engine exit speed, and the first engine initiation fuel injection quantity adjustment value is gradually decreased based on the preset engine initiation fuel injection quantity. This allows the step size of the motor drag speed change, the step size of the motor drag engine torque exit speed change, and the step size of the engine initiation fuel injection quantity change to decrease as the temperature rises, thereby achieving fine adjustment of the preset start parameters to ensure the success rate of subsequent engine starts.

[0114] S509: When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be the low-temperature cold start mode.

[0115] S510, when the engine start mode is low temperature cold start mode, determines the adjustment value of the second motor reverse speed, the adjustment value of the second motor reverse engine exit speed, and the adjustment value of the second engine start fuel injection quantity according to the preset start parameters.

[0116] Specifically, when the engine's pre-automatic mode is in low-temperature cold start mode, the second motor's reverse speed adjustment value is gradually reduced based on the preset motor reverse speed, the second motor's reverse speed adjustment value is gradually increased based on the preset motor reverse engine exit speed, and the second engine's initial fuel injection quantity adjustment value is gradually increased based on the preset engine initial injection quantity. This allows the step size of the motor's drag speed change, the step size of the motor's torque exit speed change, and the step size of the engine's initial fuel injection quantity change to increase as the temperature decreases, achieving large step size adjustments. This enables rapid learning of the starting parameters at low temperatures and determines the starting adjustment parameters based on the preset starting parameters to ensure a high success rate for subsequent engine starts.

[0117] S511, the motor-driven engine reversing function is restarted based on the first motor reversing speed adjustment value, the first motor reversing engine exit speed adjustment value, and the first engine starting fuel injection quantity adjustment value, or the motor-driven engine reversing function is restarted based on the second motor reversing speed adjustment value, the second motor reversing engine exit speed adjustment value, and the second engine starting fuel injection quantity adjustment value, until the engine starts successfully.

[0118] Specifically, the motor-driven engine reversing function is restarted by utilizing the first motor reversing speed adjustment value, the first motor reversing engine exit speed adjustment value, and the first engine starting fuel injection quantity adjustment value obtained in the normal temperature start mode, or by utilizing the second motor reversing speed adjustment value, the second motor reversing engine exit speed adjustment value, and the second engine starting fuel injection quantity adjustment value obtained in the low temperature cold start mode, to ensure the engine starting success rate in either the normal temperature start mode or the low temperature cold start mode.

[0119] This invention, in its embodiments, determines the following adjustments based on preset starting parameters when the engine starts in a normal temperature start mode: first motor reverse speed adjustment, first motor reverse engine exit speed adjustment, and first engine initial fuel injection quantity adjustment. When the engine starts in a low temperature cold start mode, it determines the following adjustments based on preset starting parameters: second motor reverse speed adjustment, second motor reverse engine exit speed adjustment, and second engine initial fuel injection quantity adjustment. The motor reverse engine function is then restarted based on these values, either individually or in combination, until the engine starts successfully. This ensures a high engine starting success rate under different environments.

[0120] Optional, Figure 6 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the method includes:

[0121] S601, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0122] S602, starts the motor towing engine function according to preset start parameters and determines the engine start status.

[0123] S603: When the engine starts successfully, the start-up process is complete and the engine exits.

[0124] S604: When the engine fails to start, it enters the electric motor reverse-dragging self-learning mode.

[0125] S605 obtains engine coolant temperature, ambient temperature, and ambient pressure values.

[0126] S606, obtains the preset engine coolant temperature value, preset ambient temperature value, and preset ambient pressure value.

[0127] S607: When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode.

[0128] S608, when the engine start mode is normal temperature start mode, determines the adjustment value of the first motor reverse speed, the adjustment value of the first motor reverse engine exit speed, and the adjustment value of the first engine start fuel injection quantity according to the preset start parameters.

[0129] S609: When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be the low temperature cold start mode.

[0130] S610, when the engine start mode is low temperature cold start mode, determines the adjustment value of the second motor reverse speed, the adjustment value of the second motor reverse engine exit speed, and the adjustment value of the second engine start fuel injection quantity according to the preset start parameters.

[0131] S611, restart the motor-driven engine function based on the first motor's reverse speed adjustment value, the first motor's reverse engine exit speed adjustment value, and the first engine's starting fuel injection quantity adjustment value, or restart the motor-driven engine function based on the second motor's reverse speed adjustment value, the second motor's reverse engine exit speed adjustment value, and the second engine's starting fuel injection quantity adjustment value.

[0132] S612, when the engine starts successfully again, update and store the first motor reverse speed adjustment value, the first motor reverse engine exit speed adjustment value, and the first engine start fuel injection quantity adjustment value as preset start parameters, or update and store the second motor reverse speed adjustment value, the second motor reverse engine exit speed adjustment value, and the second engine start fuel injection quantity adjustment value as preset start parameters, then the start-up and exit are completed.

[0133] Specifically, when the motor-driven engine start function is re-entered using the corresponding start adjustment parameters under different engine start modes, and the engine starts successfully again, the current start adjustment parameters are stored and updated to the preset start parameters so that the motor-driven engine function can be performed with the new preset start parameters next time, thereby improving the engine start success rate.

[0134] In this embodiment of the invention, when the engine restarts successfully, the adjustment values ​​for the first motor's reverse towing speed, the first motor's reverse engine exit speed, and the first engine's initial fuel injection quantity are updated and stored as preset starting parameters; or the adjustment values ​​for the second motor's reverse towing speed, the second motor's reverse engine exit speed, and the second engine's initial fuel injection quantity are updated and stored as preset starting parameters. This completes the start-up and exit process, ensuring an improved engine start-up success rate the next time the motor reverse towing engine function is executed.

[0135] Optional, Figure 7 This is a flowchart illustrating another hybrid vehicle start-up control method provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the method includes:

[0136] S701, obtain the preset starting parameters when the motor is towing the engine. The preset starting parameters include the preset motor towing speed, the preset motor towing engine exit speed, and the preset engine start-up fuel injection quantity.

[0137] S702 starts the motor towing the engine function according to the preset start parameters and determines the engine start status.

[0138] S703: When the engine starts successfully, the start-up process is complete and the engine exits.

[0139] S704: When the engine fails to start, it enters the electric motor reverse-dragging self-learning mode.

[0140] S705 obtains engine coolant temperature, ambient temperature, and ambient pressure values.

[0141] S706, obtains preset engine coolant temperature value, preset ambient temperature value and preset ambient pressure value.

[0142] S707: When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode.

[0143] S708, when the engine start mode is normal temperature start mode, determines the adjustment value of the first motor reverse speed, the adjustment value of the first motor reverse engine exit speed, and the adjustment value of the first engine start fuel injection quantity according to the preset start parameters.

[0144] S709: When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be the low temperature cold start mode.

[0145] S710, when the engine start mode is low temperature cold start mode, determines the adjustment value of the second motor reverse speed, the adjustment value of the second motor reverse engine exit speed, and the adjustment value of the second engine start fuel injection quantity according to the preset start parameters.

[0146] S711, the motor towing engine function is restarted based on the first motor towing speed adjustment value, the first motor towing engine exit speed adjustment value, and the first engine starting fuel injection quantity adjustment value, or the motor towing engine function is restarted based on the second motor towing speed adjustment value, the second motor towing engine exit speed adjustment value, and the second engine starting fuel injection quantity adjustment value.

[0147] S712, when the engine starts successfully again, update and store the first motor reverse speed adjustment value, the first motor reverse engine exit speed adjustment value, and the first engine start fuel injection quantity adjustment value as preset start parameters, or update and store the second motor reverse speed adjustment value, the second motor reverse engine exit speed adjustment value, and the second engine start fuel injection quantity adjustment value as preset start parameters, then the start-up and exit are completed.

[0148] S713, when the engine fails to start again, updates and stores the start adjustment parameters as preset start parameters, and obtains the number of start attempts.

[0149] Specifically, if the engine fails to restart using the self-learned start adjustment parameters, these parameters will also be recorded. In this case, it is considered that the start adjustment parameters cannot enable the motor to successfully reverse-drive the engine. The number of starts also needs to be recorded each time the motor reverse-drives the engine.

[0150] S714, obtain the preset number of startups.

[0151] The preset number of startups can be set according to actual design requirements, and this embodiment of the invention does not impose specific limitations.

[0152] S715: When the number of starts is less than the preset number of starts, it will re-enter the motor reverse drive self-learning mode.

[0153] When the number of starts is less than the preset number of starts, the motor reverse-drive self-learning mode is re-entered with the recorded start adjustment parameters, and self-learning is performed again to obtain new start adjustment parameters, thereby repeating the motor reverse-drive engine function.

[0154] S716: When the number of starts is greater than or equal to the preset number of starts, output engine start fault information.

[0155] When the number of starts is greater than or equal to the preset number of starts, the motor reverse drag self-learning mode will be exited, engine start fault information will be output, a start failure fault will be reported, and the driver will be reminded to troubleshoot the fault to ensure the subsequent engine start effect.

[0156] This invention, in its embodiments, updates and stores the starting adjustment parameters to preset starting parameters after the engine fails to start again, and obtains the number of starts; obtains the preset number of starts; when the number of starts is less than the preset number of starts, it re-enters the motor reverse-dragging self-learning mode; when the number of starts is greater than or equal to the preset number of starts, it outputs engine starting fault information. When the motor reverse-dragging engine function fails to start multiple times, hardware fault diagnosis is required to ensure subsequent engine starting effectiveness.

[0157] Based on the same inventive concept, embodiments of the present invention also provide a hybrid vehicle start-up control device. This hybrid vehicle start-up control device is used to execute the hybrid vehicle start-up control method provided in any embodiment of the present invention. The hybrid vehicle start-up control device can be implemented by software and / or hardware.

[0158] Figure 8 This is a schematic diagram of the structure of a hybrid vehicle start-up control device provided in an embodiment of the present invention, as shown below. Figure 8 As shown, the hybrid vehicle start-up control device includes:

[0159] The preset starting parameter acquisition module 201 for motor towing engine is used to acquire preset starting parameters for motor towing engine. The preset starting parameters include preset motor towing speed, preset motor towing engine exit speed and preset engine start-up fuel injection quantity.

[0160] The motor-driven engine function start-up and engine start-up status determination module 202 is used to start the motor-driven engine function according to preset start-up parameters and determine the engine start-up status.

[0161] The startup completion module 203 is used to complete the startup and exit when the engine starts successfully;

[0162] The starting adjustment parameter determination module 204 is used to enter the motor reverse drag self-learning mode when the engine fails to start, and determine the starting adjustment parameters according to the preset starting parameters. The starting adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value.

[0163] The motor-driven engine re-start module 205 is used to restart the motor-driven engine re-start function according to the start adjustment parameters until the engine starts successfully.

[0164] Therefore, the hybrid vehicle start control device provided in the embodiments of the present invention includes the technical features of the hybrid vehicle start control method provided in any embodiment of the present invention, and can achieve the beneficial effects of the hybrid vehicle start control method provided in any embodiment of the present invention. The similarities can be referred to the above description of the hybrid vehicle start control method provided in the embodiments of the present invention, and will not be repeated here.

[0165] Based on the same inventive concept, this embodiment of the invention also provides a hybrid vehicle, which includes a hybrid vehicle start control device. The hybrid vehicle start control device is used to execute the hybrid vehicle start control method provided in any embodiment of the invention. Therefore, the hybrid vehicle provided in this embodiment of the invention includes the technical features of the hybrid vehicle start control device provided in this embodiment of the invention, and can achieve the beneficial effects of the hybrid vehicle start control device provided in this embodiment of the invention. The similarities can be referred to the above description of the hybrid vehicle start control device provided in this embodiment of the invention, and will not be repeated here.

[0166] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A hybrid vehicle start-up control method, characterized in that, The hybrid vehicle start-up control method includes: Acquire preset starting parameters when the motor is reversing the engine, the preset starting parameters including preset motor reversing speed, preset motor reversing engine exit speed and preset engine start fuel injection quantity; The motor is activated to reverse-drive the engine according to the preset start parameters, and the engine start status is determined. When the engine starts successfully, the startup process is complete and the process ends. When the engine fails to start, it enters the motor reverse drag self-learning mode and determines the start adjustment parameters according to the preset start parameters. The start adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value. Restart the motor-driven engine function according to the startup adjustment parameters until the engine starts successfully; After entering the motor reverse self-learning mode, it also includes: Determine the engine start mode, wherein the engine start mode includes a low-temperature cold start mode and a normal-temperature start mode; The step of determining the startup adjustment parameters based on the preset startup parameters includes: The start adjustment parameters are determined based on the engine start mode and the preset start parameters.

2. The hybrid vehicle start-up control method according to claim 1, characterized in that, Before determining the engine start mode, the following also applies: Obtain engine coolant temperature, ambient temperature, and ambient pressure values; Obtain preset engine coolant temperature, preset ambient temperature, and preset ambient pressure values.

3. The hybrid vehicle start-up control method according to claim 2, characterized in that, Determine the engine start mode, including: When the engine coolant temperature is greater than or equal to the preset engine coolant temperature, the ambient temperature is greater than or equal to the preset ambient temperature, and the ambient pressure is greater than or equal to the preset ambient pressure, the engine start mode is determined to be the normal temperature start mode. When the engine coolant temperature is lower than the preset engine coolant temperature, the ambient temperature is lower than the preset ambient temperature, and the ambient pressure is lower than the preset ambient pressure, the engine start mode is determined to be a low-temperature cold start mode.

4. The hybrid vehicle start-up control method according to claim 3, characterized in that, The motor reverse speed adjustment value includes a first motor reverse speed adjustment value and a second motor reverse speed adjustment value; the motor reverse engine exit speed adjustment value includes a first motor reverse engine exit speed adjustment value and a second motor reverse engine exit speed adjustment value; the engine initial fuel injection quantity adjustment value includes a first engine initial fuel injection quantity adjustment value and a second engine initial fuel injection quantity adjustment value. The first motor's reverse speed adjustment value is greater than the preset motor's reverse speed, the preset motor's reverse speed is greater than the second motor's reverse speed adjustment value, the first motor's reverse engine exit speed adjustment value is less than the preset motor's reverse engine exit speed, the preset motor's reverse engine exit speed is less than the second motor's reverse engine exit speed adjustment value, the first engine's initial fuel injection quantity adjustment value is less than the preset engine's initial fuel injection quantity, and the preset engine's initial fuel injection quantity is less than the second engine's initial fuel injection quantity adjustment value; Determining the startup adjustment parameters based on the preset startup parameters includes: When the engine start mode is normal temperature start mode, the adjustment value of the first motor reverse speed, the adjustment value of the first motor reverse engine exit speed, and the adjustment value of the first engine start fuel injection quantity are determined according to the preset start parameters.

5. The hybrid vehicle start-up control method according to claim 4, characterized in that, Determining the startup adjustment parameters based on the preset startup parameters also includes: When the engine start mode is low temperature cold start mode, the adjustment value of the second motor reverse speed, the adjustment value of the second motor reverse engine exit speed, and the adjustment value of the second engine start fuel injection quantity are determined according to the preset start parameters.

6. The hybrid vehicle start-up control method according to claim 1, characterized in that, After restarting the motor-assisted engine reversing function according to the aforementioned start-up adjustment parameters, the following is also included: When the engine starts successfully again, the start adjustment parameters are updated and stored as the preset start parameters, then the start-up process is complete and the engine exits.

7. The hybrid vehicle start-up control method according to claim 6, characterized in that, Also includes: If the engine fails to start again, the starting adjustment parameters are updated and stored as the preset starting parameters, and the number of starts is obtained. Get the preset number of launches; When the number of starts is less than the preset number of starts, the motor reverse self-learning mode is entered again; When the number of starts is greater than or equal to the preset number of starts, an engine start fault information is output.

8. A hybrid vehicle start-up control device, characterized in that, The hybrid vehicle start control device executes the hybrid vehicle start control method according to any one of claims 1-7, wherein the hybrid vehicle start control device comprises: A module for acquiring preset starting parameters when the motor is reversing and towing the engine is used to acquire preset starting parameters when the motor is reversing and towing the engine. The preset starting parameters include preset motor reversing speed, preset motor reversing and engine exit speed, and preset engine starting fuel injection quantity. The motor-driven engine function start-up and engine start-up status determination module is used to start the motor-driven engine function according to the preset start-up parameters and determine the engine start-up status. The startup completion module is used to complete the startup and exit when the engine starts successfully; The startup adjustment parameter determination module is used to enter the motor reverse drag self-learning mode when the engine fails to start, and determine the startup adjustment parameters according to the preset startup parameters. The startup adjustment parameters include the motor reverse drag speed adjustment value, the motor reverse drag engine exit speed adjustment value, and the engine start fuel injection quantity adjustment value. The motor-driven engine re-start module is used to restart the motor-driven engine re-start function according to the start adjustment parameters until the engine starts successfully. After entering the motor reverse self-learning mode, it also includes: Determine the engine start mode, wherein the engine start mode includes a low-temperature cold start mode and a normal-temperature start mode; The step of determining the startup adjustment parameters based on the preset startup parameters includes: The start adjustment parameters are determined based on the engine start mode and the preset start parameters.

9. A hybrid vehicle, characterized in that, Includes the hybrid vehicle start control device as described in claim 8.

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