Electronic-pump-free gearbox whole-vehicle flameout N-gear keeping control method and related equipment

Abstract

The invention belongs to the field of electronic-pump-free gearbox detection, and discloses an electronic-pump-free gearbox whole-vehicle flameout N-gear keeping control method and related equipment. Safety access authentication is completed based on a diagnosis extension session request sent by production line electric detection equipment; and after success, opening a write-in permission to receive a special mode identifier of the function of forbidding the N-gear flameout and automatically jumping to the P-gear, and outputting a flameout N-gear holding instruction in combination with the flameout state information of the ignition switch and the identifier. A special mode identifier is obtained through security authentication and data interaction, so that a TCU default strategy is changed, and an N-gear holding instruction is accurately output according to the identifier and a flameout state when a vehicle flames out. By adopting the method, the problem that the vehicle without the electronic pump gearbox cannot keep the N gear after the engine flames out is successfully solved, the vehicle is prevented from automatically jumping to the P gear, the production line efficiency is improved, the production line operation time, the fuel consumption and the mechanical wear are reduced, meanwhile, the special working condition requirements of the electronic pump gearbox are met, and the production cost is reduced. And great convenience is brought to specific station operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic pump-free gearbox detection, and particularly relates to a vehicle-free gearbox-free gearbox N gear retention control method and related equipment. Background Art

[0002] During the vehicle production process, many important workstation operations, such as four-wheel alignment on the production line, lighting inspection, electrical inspection and calibration, need to be performed with the engine off, the ignition switch in the ON position, and the transmission gear in the N position.

[0003] However, some transmissions use mechanical oil pumps instead of external electronic pumps for cost reduction and other reasons. However, some transmissions without external electronic pumps (relying only on engine-driven mechanical oil pumps) have the following defects: First, the oil pressure is dependent on the engine running: the mechanical oil pump requires the engine to be running to generate sufficient oil pressure to release the parking gear (P gear). After the vehicle is turned off, the oil pressure drops rapidly, causing the transmission to be unable to maintain N gear and automatically jump to P gear. Second, the production line efficiency is low: traditional solutions require repeated engine restarts to maintain oil pressure, increasing production line operation time and fuel consumption, and frequent starts and stops increase mechanical wear. Third, functional limitations: the existing TCU default strategy forces the vehicle to jump to P gear after all gears (R gear / N gear / D gear) are turned off to ensure that the vehicle is locked and dormant, but it cannot adapt to the special working conditions of transmissions without electronic pumps.

[0004] It can be seen that for vehicles without electronic pump transmissions, when the engine is turned off, it is impossible to maintain N gear, which brings great inconvenience and challenges to operations at specific workstations. Summary of the Invention

[0005] The present invention provides a method and related equipment for controlling the vehicle's N gear retention when the transmission is turned off without an electronic pump. This method controls the automatic shift to P gear function when the vehicle is turned off in N gear under a special TCU mode, thereby enabling the vehicle to maintain N gear when the transmission is turned off, thereby meeting the needs of specific workstation operations during vehicle production.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for controlling the vehicle to maintain N gear when the transmission is turned off without an electronic pump, comprising: Based on the diagnostic extended session request sent by the production line electrical inspection equipment, secure access authentication is performed with the production line electrical inspection equipment; After successful security access authentication, write permission is granted to receive a special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the automatic shift to P gear function when the engine is turned off in N gear; Combined with the ignition switch's flameout status information and special mode identification, a flameout N gear hold instruction is output so that the entire vehicle in the flameout state can always remain in N gear during the diagnosis process.

[0007] Furthermore, the secure access authentication with the production line electrical inspection device based on the diagnostic extension session request sent by the production line electrical inspection device includes: Receive diagnostic extension session requests sent by production line electrical inspection equipment; Generate a random seed based on the diagnostic extended session request and send the random seed to the production line electrical inspection equipment; The security access authentication between the TCU and the production line electrical inspection equipment is completed based on the key sent back by the production line electrical inspection equipment.

[0008] Furthermore, after the security access authentication is successful, the write permission is opened and the special mode identifier transmitted by the production line electrical inspection equipment is received, including: Secure access authentication between TCU and production line electrical inspection equipment; If the security access authentication fails, the diagnostic extension session request is terminated; If the security access authentication is successful, the write permission is opened to receive the special mode identifier written by the production line electrical inspection equipment; among them, the data identifier DID of the special mode identifier is 0x0AF0, and the value is 0x01, which is used to disable the function of automatically jumping to P gear when the engine is turned off in N gear.

[0009] Furthermore, before outputting the flameout N gear holding instruction in combination with the ignition switch flameout status information and the special mode identifier, the method further includes: When the engine is started, the gear is switched from P to N and the mechanical oil pump is used to build up oil pressure. Turn off the vehicle and turn the ignition switch to the ON position. The TCU obtains the ignition switch off status information.

[0010] Furthermore, the outputting of the flameout N gear holding instruction in combination with the ignition switch flameout status information and the special mode identifier includes: Generate a flameout N gear hold instruction based on the ignition switch flameout status information and the special mode identifier; The engine-off N gear hold instruction is transmitted to the TCU, so that the TCU controls the entire vehicle to always maintain the N gear during the diagnosis process; wherein, the special mode identifier is stored in the TCU non-volatile memory.

[0011] Furthermore, after combining the ignition switch off state information and the special mode identifier and outputting the ignition off N gear holding instruction, the method further includes: Based on the diagnosis completion extended session request sent by the production line electrical inspection equipment, security access authentication is performed again with the production line electrical inspection equipment; After the security access authentication is successful, the write permission is opened and the normal mode identifier transmitted by the production line electrical inspection equipment is received; the normal mode identifier is used to enable the function of automatically switching to P gear when the engine is turned off in N gear.

[0012] Furthermore, after the security access authentication is successful, the write permission is opened, and after receiving the normal mode identifier transmitted by the production line electrical inspection equipment, the method further includes: According to the normal mode mark, in the engine-off state, verify the restoration of the automatic shift to P gear function when the engine is off.

[0013] A vehicle-turn-off N gear holding control system for a gearbox without an electronic pump, comprising: The security authentication module is used to perform security access authentication with the production line electrical inspection equipment based on the diagnostic extension session request sent by the production line electrical inspection equipment; A special mode activation module is used to grant write permissions after successful security access authentication and receive a special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the automatic shift to P gear function when the engine is turned off in N gear; The N gear hold module is used to combine the ignition switch's flameout status information and special mode identification to output a flameout N gear hold instruction so that the entire vehicle in the flameout state can always remain in N gear during the diagnosis process.

[0014] An electronic device, comprising: memory for storing computer programs; The processor is used to implement the steps of the above-mentioned method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off when executing the computer program.

[0015] A computer-readable storage medium stores a computer program, which, when executed by a processor, is used to implement the steps of the above-mentioned method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for controlling the N gear retention when the vehicle is turned off for a gearbox without an electronic pump. First, the method completes security access authentication based on the diagnostic extended session request sent by the production line electrical inspection equipment. After success, the method opens the write permission to receive a special mode identifier that disables the function of automatically jumping to P gear when the N gear is turned off. Then, the method outputs the N gear retention instruction when the vehicle is turned off in combination with the ignition switch off status information and the identifier. This method obtains the special mode identifier through security authentication and data interaction, thereby changing the TCU default strategy, and accurately outputs the N gear retention instruction according to this identifier and the off status when the vehicle is turned off. This method successfully solves the problem that vehicles with gearboxes without an electronic pump cannot maintain N gear after the engine is turned off, avoids the vehicle automatically jumping to P gear, improves the efficiency of the production line, reduces the production line operation time, fuel consumption and mechanical wear, and meets the special working condition requirements of gearboxes without an electronic pump, bringing great convenience to specific workstation operations.

[0017] Optimally, the present invention utilizes a secure access authentication process that enhances communication security between the TCU and the production line electrical inspection equipment by receiving a diagnostic extended session request, generating a random seed, and sending it to the production line electrical inspection equipment. This sequence of operations uses the returned key to complete authentication. Only through this secure authentication mechanism can subsequent data interactions and operations be guaranteed to be legal and secure, preventing unauthorized devices or data from interfering with or damaging the vehicle control system, ensuring the effective implementation of the entire control method and ensuring vehicle safety.

[0018] Optimally, in this invention, if authentication fails, the diagnostic extension session request is terminated, avoiding ineffective operations and wasted resources. If authentication succeeds, write permission is granted and the special mode identifier is accepted, ensuring that only legitimate production line electrical inspection equipment can write to the special mode identifier, further ensuring the accuracy and reliability of the control method. Furthermore, the data identifier and value of the special mode identifier are clearly defined, providing a clear basis for the TCU to correctly identify and process the identifier, thereby improving the stability and maintainability of the entire control system.

[0019] Preferably, in the present invention, while the engine is started, the oil pressure is established during the shift from P to N, providing a foundation for subsequent N-range retention. After the vehicle is shut down, the TCU acquires the engine shutdown status information, providing a key state basis for the subsequent output of the N-range retention command. This step ensures that the N-range retention command is issued when the vehicle is under appropriate oil pressure and status conditions, improving the accuracy and stability of the N-range retention function and avoiding N-range retention failures due to state mismatch.

[0020] Preferably, in the present invention, a N-gear hold command is generated and transmitted to the TCU based on the ignition-off status information and the special mode flag. This information allows the TCU to accurately control the vehicle to remain in N-gear during the diagnostic process. The special mode flag is stored in the TCU's non-volatile memory, ensuring it is not lost after a power outage, thus ensuring the continued effectiveness of the N-gear hold function. This step ensures the accurate output and execution of the N-gear hold command, improving the reliability and stability of the N-gear hold function. This meets the operational requirements of specific workstations, ensuring that the vehicle remains in N-gear even when the ignition is off, and providing important support for production line operations.

[0021] Preferably, the present invention combines the engine-off status information with a special mode identifier to output a hold-in-N command, ensuring the vehicle remains in N gear even when the engine is off. This function provides a critical guarantee for specific workstation operations, resolving the issue of N gear shifting caused by insufficient oil pressure in traditional transmissions without electronic pumps. This improves production line efficiency and safety, while also reducing fuel consumption and mechanical wear caused by frequent engine starts and stops.

[0022] Preferably, in the present invention, after the N-range hold function is completed, a diagnostic completion extended session request is sent by the production line electrical inspection equipment, and security access authentication is performed again with the production line electrical inspection equipment. A normal mode flag is received to enable the automatic shift to P-range function upon engine shutdown in N-range. This step ensures that the vehicle can resume normal function after completing a specific workstation operation, avoiding any impact on subsequent vehicle use and ensuring the integrity and reliability of the vehicle's functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of a method for controlling the vehicle to maintain N gear when the vehicle is turned off and has no electronic pump transmission, provided by the present invention; Figure 2 This is a structural schematic diagram of a vehicle-turned-off N gear holding control system for a gearbox without an electronic pump provided by the present invention. DETAILED DESCRIPTION

[0024] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0025] The following is an explanation of the technical terms involved in the present invention: TCU (Transmission Control Unit), automatic transmission control unit, is the core component of the automotive electronic control system, used to control the shifting logic and operation of the automatic transmission.

[0026] Example 1 This embodiment provides a method for controlling the vehicle's N gear retention during engine shutdown with a non-pump transmission. It is suitable for off-line inspection and maintenance of hybrid and conventional fuel vehicles. By setting a special mode in the TCU, this method enables precise control of the automatic shift to P gear function upon engine shutdown in N gear. This method effectively solves the problem of maintaining N gear during engine shutdown in vehicles with non-pump transmissions. It offers significant technical innovation and practical application value, facilitating vehicle manufacturing and improving production efficiency and product quality.

[0027] This embodiment provides a method for controlling the vehicle to maintain the N gear when the vehicle is turned off and does not have an electronic pump. The method is applied to the TCU control end and includes: Step 1: Activate special mode: Send an extended session request to the TCU via the UDS protocol to complete secure access authentication.

[0028] Write a special mode flag to disable the function of switching to P gear after the engine is turned off in N gear.

[0029] Step 2: N gear holding process: When the engine is started, switch from P gear to N gear and use the mechanical oil pump to build up oil pressure.

[0030] After the engine is turned off, keep the ignition switch on and the TCU remains locked in N gear.

[0031] Step 3: Exit special mode: Restore the default mode through the UDS command and restart the P gear function.

[0032] Among them, the communication protocol adopts ISO 14229 standard UDS service and is compatible with mainstream diagnostic equipment.

[0033] Secure access authentication uses seed-key two-way authentication to prevent misoperation.

[0034] The special mode identification is stored in a non-volatile manner to ensure that the mode status is not lost after power failure.

[0035] For example, the more specific steps of this control method are as follows: S1. Diagnostic session initialization and security authentication S101: Receive a diagnosis request The TCU receives the diagnostic extension session request sent by the production line electrical inspection equipment, triggering the diagnostic mode initialization process.

[0036] S102: Generate security authentication seed The TCU generates a random seed based on the diagnostic extended session request and sends the seed to the production line electrical inspection equipment to initiate a two-way security authentication mechanism.

[0037] S103. Complete security access authentication The production line electrical inspection equipment calculates the key based on the random seed and sends it back to the TCU, which verifies the key matching: If the verification fails, end the diagnostic session; If the verification is successful, the TCU opens the write permission and enters the special mode configuration stage.

[0038] S2, Special mode configuration: Disable N gear and automatically jump to P gear S201, receiving special mode identification The TCU, with open write permissions, receives a special mode flag transmitted by the production line's electrical inspection equipment. Its data identifier (DID) is 0x0AF0 and its value is 0x01. This flag is used to disable the automatic shift to P gear when the vehicle is turned off in N gear.

[0039] S202: Mode identification storage The TCU stores the special mode identifier in non-volatile memory to ensure that the configuration information is not lost after the vehicle is powered off.

[0040] S3, N gear maintenance control in the off state S301, shifting and oil pressure establishment When the engine is started, the driver switches the gear from P to N, and the transmission builds up oil pressure through the mechanical oil pump to provide a power basis for subsequent operations.

[0041] S302: Vehicle shutdown and status acquisition Operate the ignition switch to shut down the vehicle and keep it in the ON position. The TCU obtains the flameout status information in real time and confirms that the vehicle enters the flameout condition required for diagnosis.

[0042] S303: Generate and execute a hold instruction The TCU combines the current ignition switch off status information with the stored special mode flag to generate a "hold in N" command and transmits it to the actuator. This command controls the transmission to maintain N during the diagnostic process, preventing diagnostic interruptions caused by automatic shifting to P.

[0043] S4. Diagnosis completion and functional recovery S401, diagnosis session end request After the production line electrical inspection equipment completes the diagnosis, it sends a diagnosis completion extended session request to the TCU, triggering the function recovery process.

[0044] S402, Secondary Security Authentication The TCU and the production line electrical inspection equipment undergo security access authentication again (the process is the same as the first step). After successful authentication, write permission is granted.

[0045] S403, configure normal mode flag The TCU receives the normal mode identifier transmitted by the production line electrical inspection equipment (used to re-enable the function of automatically switching to P gear when the engine is turned off in N gear) and updates the configuration parameters in the non-volatile memory.

[0046] S404, Function Recovery Verification Based on the normal mode indicator, the TCU verifies whether the automatic P gear shift function when the engine is turned off has returned to normal, ensuring that the vehicle control logic returns to the factory settings.

[0047] This embodiment provides a method for maintaining the N gear position when the vehicle is stalled in a transmission without an electronic pump. This method solves the technical problem of maintaining the gear position during stall diagnosis in a transmission without an electronic pump through standardized diagnostic interaction processes and logical control, thereby improving the efficiency and safety of electrical inspections on the production line. The advantages are as follows: First, security and controllability: a two-way security authentication mechanism is used to prevent unauthorized access and ensure the uniqueness and reliability of the diagnostic process.

[0048] Second, precise retention: Using non-volatile memory to store mode identification, combined with real-time control of ignition status, to achieve precision and stability in N gear retention.

[0049] Third, closed-loop process: Mode switching and function verification before and after diagnosis form a complete control chain to ensure that there are no residual configuration risks for the entire vehicle after diagnosis.

[0050] For example, this method is applied to actual special working conditions and implemented as follows: Example 1: N gear hold control in a production line electrical inspection scenario.

[0051] Step 1: Security authentication and special mode activation: During vehicle assembly line testing, the line's electrical inspection equipment sends a diagnostic extended session request (e.g., session $10 03 in the UDS protocol) to the transmission control unit (TCU) via the CAN bus. Upon receiving the request, the TCU generates a random seed (e.g., 0x5A3D) and sends it to the electrical inspection equipment. The equipment generates a key (Key = 0x8E7F) based on a pre-set algorithm (e.g., AES encryption) and returns it. After the TCU verifies the key is correct, security access authentication is passed and write permission is granted.

[0052] The electronic inspection device writes a special mode identifier (DID = 0x0AF0, value = 0x01) to the TCU via the WriteDataByIdentifier command. The TCU stores this identifier in non-volatile memory. At this point, the automatic shift to P gear when the engine is turned off in N gear is disabled.

[0053] Step 2: Execution of flameout control logic: The operator starts the vehicle and shifts from P to N with the engine running. The mechanical oil pump builds up oil pressure to ensure reliable shifting. The engine is then shut down and the ignition switch is turned ON (maintaining power). The TCU detects the ignition switch being off (IG_OFF signal) and, combined with the special mode flag (0x01), generates an ignition-off N hold command, controlling the transmission locking mechanism to maintain N.

[0054] When the production line's electrical inspection equipment performs activation tests on systems such as the chassis and ABS, the vehicle always remains in N gear to avoid test interruptions or equipment communication abnormalities caused by automatic shifting to P gear.

[0055] Step 3: Mode recovery after the test is completed: After the test is complete, the electrical inspection device initiates security authentication again and writes the normal mode flag (DID = 0x0AF0, value = 0x00). The TCU clears the special flag and restores the N-gear shift-to-P function. The operator restarts the vehicle to verify that the gear automatically shifts to P after the engine is turned off, and normal functionality is restored.

[0056] Example 2: Neutral gear hold control in an after-sales diagnosis scenario.

[0057] Step 1: Trigger offline diagnostic mode: After the vehicle arrives at the aftermarket repair station, the repairman connects the diagnostic tool and manually triggers the "Service Mode" option. The diagnostic tool sends an extended session request ($10 03), and the TCU responds and completes a dynamic key exchange (if using a challenge-response mechanism). After authentication, the diagnostic tool writes DID = 0x0AF0 and Value = 0x01, activating the special mode.

[0058] Step 2: Maintain oil pressure and gear position: The maintenance technician starts the vehicle and shifts it into neutral, using the mechanical oil pump to build up oil pressure before shutting off the engine. The TCU detects the special mode indicator and continuously monitors the transmission hydraulic pressure sensor data. If the oil pressure falls below a threshold (e.g., 2 bar), the TCU sends a warning signal to the diagnostic tool via the CAN bus, prompting the system to restart and replenish pressure.

[0059] When replacing the transmission valve body or other operations that require a long power outage, the entire vehicle remains in N gear, avoiding the tedious operation of repeatedly powering on and off to maintain oil pressure in traditional solutions.

[0060] Step 3: Safe Exit Mechanism: After the repair is complete, the diagnostic tool re-authenticates and writes DID = 0x0AF0 value = 0x00. The TCU executes the exit logic: if the current gear is N and the ignition switch is OFF, it automatically switches to P and locks the vehicle. The TCU also records the number of times the special mode is used and the timestamp in the fault log to meet after-sales traceability requirements.

[0061] In the above specific example, dynamic safety authentication and mode identification control accurately achieve N gear retention during engine shutdown in a transmission system without an electronic pump. This resolves equipment compatibility issues caused by automatic P gear shifting during production line inspection and after-sales repair, while also avoiding the increased costs of traditional solutions that rely on electronic pumps. The non-volatile storage design of the special mode identification ensures logical consistency after an abnormal power outage, balancing functionality and safety.

[0062] Example 2 like Figure 1 As shown, this embodiment provides a method for controlling the vehicle to maintain N gear when the transmission is turned off without an electronic pump, including the following steps: Based on the diagnostic extended session request sent by the production line electrical inspection equipment, secure access authentication is performed with the production line electrical inspection equipment; After successful security access authentication, write permission is granted to receive a special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the automatic shift to P gear function when the engine is turned off in N gear; Combined with the ignition switch's flameout status information and special mode identification, a flameout N gear hold instruction is output so that the entire vehicle in the flameout state can always remain in N gear during the diagnosis process.

[0063] In this embodiment, the secure access authentication with the production line electrical inspection device based on the diagnostic extension session request sent by the production line electrical inspection device includes: Receive diagnostic extension session requests sent by production line electrical inspection equipment; Generate a random seed based on the diagnostic extended session request and send the random seed to the production line electrical inspection equipment; The security access authentication between the TCU and the production line electrical inspection equipment is completed based on the key sent back by the production line electrical inspection equipment.

[0064] In this embodiment, after the security access authentication is successful, the write permission is opened, and the special mode identifier transmitted by the production line electrical inspection equipment is received, including: Secure access authentication between TCU and production line electrical inspection equipment; If the security access authentication fails, the diagnostic extension session request is terminated; If the security access authentication is successful, the write permission is opened to receive the special mode identifier written by the production line electrical inspection equipment; among them, the data identifier DID of the special mode identifier is 0x0AF0, and the value is 0x01, which is used to disable the function of automatically jumping to P gear when the engine is turned off in N gear.

[0065] In this embodiment, before outputting the flameout N gear hold instruction in combination with the ignition switch flameout status information and the special mode identifier, the method further includes: When the engine is started, the gear is switched from P to N and the mechanical oil pump is used to build up oil pressure. Turn off the vehicle and turn the ignition switch to the ON position. The TCU obtains the ignition switch off status information.

[0066] In this embodiment, the outputting of the flameout N gear holding instruction in combination with the ignition switch flameout status information and the special mode identifier includes: Generate a flameout N gear hold instruction based on the ignition switch flameout status information and the special mode identifier; The engine-off N gear hold instruction is transmitted to the TCU, so that the TCU controls the entire vehicle to always maintain the N gear during the diagnosis process; wherein, the special mode identifier is stored in the TCU non-volatile memory.

[0067] In this embodiment, after combining the ignition switch off state information and the special mode identifier and outputting the ignition off N gear hold instruction, the method further includes: Based on the diagnosis completion extended session request sent by the production line electrical inspection equipment, security access authentication is performed again with the production line electrical inspection equipment; After the security access authentication is successful, the write permission is opened and the normal mode identifier transmitted by the production line electrical inspection equipment is received; the normal mode identifier is used to enable the function of automatically switching to P gear when the engine is turned off in N gear.

[0068] In this embodiment, after the security access authentication is successful, the write permission is granted, and after receiving the normal mode identifier transmitted by the production line electrical inspection equipment, the following steps are also included: According to the normal mode mark, in the engine-off state, verify the restoration of the automatic shift to P gear function when the engine is off.

[0069] like Figure 2As shown, this embodiment also provides a control system for maintaining the N gear when the vehicle is turned off with a gearbox without an electronic pump, including: a security authentication module, which is used to perform security access authentication with the production line electrical inspection equipment based on the diagnostic extension session request sent by the production line electrical inspection equipment; a special mode activation module, which is used to open write permissions after the security access authentication is successful, and receive the special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the function of automatically jumping to P gear when the N gear is turned off; an N gear holding module, which is used to combine the flameout status information of the ignition switch and the special mode identifier to output a flameout N gear holding instruction, so that the vehicle in the flameout state can always maintain N gear during the diagnosis process.

[0070] The present invention also provides an electronic device, comprising: a memory for storing a computer program; and a processor for implementing the steps of the method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off when executing the computer program.

[0071] When the processor executes the computer program, the steps of controlling the N gear retention when the vehicle with a transmission without an electronic pump is turned off are implemented, for example: based on a diagnostic extension session request sent by the production line electrical inspection equipment, security access authentication is performed with the production line electrical inspection equipment; after successful security access authentication, write permission is opened to receive a special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the function of automatically jumping to P gear when the vehicle is turned off in N gear; in combination with the ignition switch's ignition off status information and the special mode identifier, a ignition off N gear retention instruction is output, so that the vehicle in the ignition off state can always remain in N gear during the diagnosis process.

[0072] Alternatively, when the processor executes the computer program, it implements the functions of each module in the above-mentioned system, for example: a security authentication module, which is used to perform security access authentication with the production line electrical inspection equipment based on the diagnostic extension session request sent by the production line electrical inspection equipment; a special mode activation module, which is used to open write permission after successful security access authentication and receive a special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the function of automatically jumping to P gear when the engine is turned off in N gear; an N gear holding module, which is used to combine the engine off status information of the ignition switch and the special mode identifier to output a flameout N gear holding instruction, so that the entire vehicle in the flameout state can always maintain N gear during the diagnosis process.

[0073] Exemplarily, the computer program can be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments that can complete preset functions, and the instruction segments are used to describe the execution process of the computer program in the electronic pump-free transmission vehicle stall N gear retention control device. For example, the computer program can be divided into a security authentication module, a special mode activation module and an N gear retention module; the specific functions of each module are as follows: the security authentication module is used to perform security access authentication with the production line electrical inspection equipment based on the diagnostic extension session request sent by the production line electrical inspection equipment; the special mode activation module is used to open write permissions after the security access authentication is successful and receive the special mode identifier transmitted by the production line electrical inspection equipment; the special mode identifier is used to disable the automatic jump to P gear function when the N gear is stalled; the N gear retention module is used to combine the ignition switch stall status information and the special mode identifier to output the stall N gear retention instruction so that the vehicle in the stalled state always remains in N gear during the diagnosis process.

[0074] The device for maintaining the N-gear when the vehicle is turned off with a gearbox without an electronic pump can be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The device for maintaining the N-gear when the vehicle is turned off with a gearbox without an electronic pump can include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above is an example of a device for maintaining the N-gear when the vehicle is turned off with a gearbox without an electronic pump, and does not constitute a limitation on the device for maintaining the N-gear when the vehicle is turned off with a gearbox without an electronic pump. It can include more components than the above, or a combination of certain components, or different components. For example, the device for maintaining the N-gear when the vehicle is turned off with a gearbox without an electronic pump can also include input and output devices, network access devices, buses, and the like.

[0075] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or any conventional processor. The processor serves as the control center for the electronic pump-less transmission vehicle stall N gear retention control system, connecting various components of the electronic pump-less transmission vehicle stall N gear retention control system via various interfaces and circuits.

[0076] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the vehicle shutdown N gear holding control device of the electronic pump-free transmission by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory.

[0077] The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as sound playback or image playback); the data storage area may store data generated based on the use of the mobile phone (such as audio data and a phone book). Furthermore, the memory may include high-speed random access memory (RAM) and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0078] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off are implemented.

[0079] If the module / unit integrated in the electronic pump-free transmission vehicle stall N gear holding control system is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0080] Based on this understanding, the present invention implements all or part of the processes in the above-mentioned method for controlling the vehicle's N gear retention during engine shutdown with a non-electronic pump transmission. This can also be accomplished by using a computer program to instruct related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-mentioned method for controlling the vehicle's N gear retention during engine shutdown with a non-electronic pump transmission. The computer program includes computer program code, which can be in source code form, object code form, executable file, or a pre-set intermediate form.

[0081] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0082] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0083] The above embodiment is only one of the embodiments that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment alone, but also includes changes, replacements and other embodiments that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the vehicle to maintain N gear when the transmission is turned off without an electronic pump, characterized in that: include: Based on the diagnostic extended session request sent by the production line electrical inspection equipment, secure access authentication is performed with the production line electrical inspection equipment; After successful security access authentication, write permission is granted to receive special mode identification transmitted by the production line electrical inspection equipment; The special mode identifier is used to disable the function of automatically switching to P gear when the engine is turned off in N gear; Combined with the ignition switch's flameout status information and special mode identification, a flameout N gear hold instruction is output so that the entire vehicle in the flameout state can always remain in N gear during the diagnosis process.

2. The method for maintaining N gear when the vehicle is turned off with a transmission without an electronic pump according to claim 1, characterized in that: The method of performing secure access authentication with the production line electrical inspection device based on the diagnostic extension session request sent by the production line electrical inspection device includes: Receive diagnostic extension session requests sent by production line electrical inspection equipment; Generate a random seed based on the diagnostic extended session request and send the random seed to the production line electrical inspection equipment; The security access authentication between the TCU and the production line electrical inspection equipment is completed based on the key sent back by the production line electrical inspection equipment.

3. The method for maintaining N gear in a vehicle-turned-off state of a transmission without an electronic pump according to claim 1, characterized in that: After the security access authentication is successful, the write permission is opened and the special mode identifier transmitted by the production line electrical inspection equipment is received, including: Secure access authentication between TCU and production line electrical inspection equipment; If the security access authentication fails, the diagnostic extension session request is terminated; If the security access authentication is successful, the write permission is opened to receive the special mode identifier written by the production line electrical inspection equipment; among them, the data identifier DID of the special mode identifier is 0x0AF0, and the value is 0x01, which is used to disable the function of automatically jumping to P gear when the engine is turned off in N gear.

4. The method for maintaining N gear in a vehicle-turned-off state of a transmission without an electronic pump according to claim 1, characterized in that: Before outputting the flameout N gear holding instruction based on the flameout state information of the ignition switch and the special mode identifier, the method further includes: When the engine is started, the gear is switched from P to N and the mechanical oil pump is used to build up oil pressure. Turn off the vehicle and turn the ignition switch to the ON position. The TCU obtains the ignition switch off status information.

5. The method for maintaining N gear in a vehicle-turned-off state of a transmission without an electronic pump according to claim 1, characterized in that: The step of combining the ignition switch off state information and the special mode identifier to output the ignition off N gear hold instruction includes: Generate a flameout N gear hold instruction based on the ignition switch flameout status information and the special mode identifier; The engine-off N gear hold instruction is transmitted to the TCU, so that the TCU controls the entire vehicle to always maintain the N gear during the diagnosis process; wherein, the special mode identifier is stored in the TCU non-volatile memory.

6. The method for maintaining N gear in a vehicle-turned-off state of a transmission without an electronic pump according to claim 1, characterized in that: After combining the ignition switch off state information and the special mode identifier and outputting the ignition off N gear holding instruction, the method further includes: Based on the diagnosis completion extended session request sent by the production line electrical inspection equipment, security access authentication is performed again with the production line electrical inspection equipment; After the security access authentication is successful, the write permission is opened and the normal mode identifier transmitted by the production line electrical inspection equipment is received; the normal mode identifier is used to enable the function of automatically switching to P gear when the engine is turned off in N gear.

7. The method for maintaining N gear when the vehicle is turned off in a gearbox without an electronic pump according to claim 6, characterized in that: After the security access authentication is successful, the write permission is released, and after receiving the normal mode identifier transmitted by the production line electrical inspection equipment, the following steps are also included: According to the normal mode mark, in the engine-off state, verify the restoration of the automatic shift to P gear function when the engine is off.

8. A vehicle-turn-off N gear holding control system without an electronic pump transmission, characterized in that: include: The security authentication module is used to perform security access authentication with the production line electrical inspection equipment based on the diagnostic extension session request sent by the production line electrical inspection equipment; The special mode activation module is used to open write permissions after successful security access authentication and receive special mode identification transmitted by the production line electrical inspection equipment; The special mode identifier is used to disable the function of automatically switching to P gear when the engine is turned off in N gear; The N gear hold module is used to combine the ignition switch's flameout status information and special mode identification to output a flameout N gear hold instruction so that the entire vehicle in the flameout state can always remain in N gear during the diagnosis process.

9. An electronic device, characterized in that: include: memory for storing computer programs; A processor is used to implement the steps of the method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it is used to implement the steps of the method for controlling the vehicle to maintain N gear when the electronic pump-free transmission is turned off as described in any one of claims 1 to 7.

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