Gearbox shift control strategy test system
Patent Information
- Application Number
- CN202522310720.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-31
AI Technical Summary
Existing testing methods for transmission control strategies cannot accurately evaluate the impact and slippage work during gear shifting, and real-vehicle verification is costly and time-consuming, making it difficult to fully cover test conditions.
A simulation model was used to replace the physical object to construct a test system for the gearbox shift control strategy. The system includes a gearbox control unit, a real-time simulator, a shift solenoid valve, a current acquisition board, a speed simulation board, and an analog output board. The simulation model simulates the impact and slip work during the shift process, and the strategy is optimized by combining it with a host computer.
It enables efficient simulation of tractor gear shifting in a virtual environment, shortens the testing cycle, accurately calculates impact and slip work, improves gearbox performance and adaptability, and reduces testing costs.
Smart Images
Figure CN224934342U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tractor testing technology, specifically a gearbox shift control strategy testing system. Background Technology
[0002] In recent years, some high-end tractors have been equipped with gearboxes capable of maintaining uninterrupted power transmission during gear shifts. These gearboxes typically employ electro-hydraulic controlled wet multi-plate clutch technology. During gear shifts, the electro-hydraulic system controls the disengagement of the clutch for the current gear while simultaneously controlling the engagement of the clutch for the target gear, thus ensuring uninterrupted power transmission. The core of this type of gearbox lies in the shift control strategy loaded into the gearbox control unit. If the shift control strategy is inappropriate, excessive shock or severe clutch slippage may occur during gear shifts. Therefore, it is necessary to thoroughly test and verify the gearbox control strategy to ensure that the shock and slippage are controlled within a reasonable range.
[0003] Currently, the testing and verification of transmission control strategies mainly employs bench testing or vehicle-based verification methods. Bench testing, limited by its testing principles, cannot obtain the impact and slippage work generated during gear shifts, thus failing to accurately evaluate shift quality and easily leading to transmission damage and lengthy verification cycles. Vehicle-based verification primarily evaluates shift impact or smoothness through instrument-collected acceleration data or driver subjective experience, but it cannot collect or evaluate the slippage work generated by the clutch during gear shifts. Furthermore, it is time-consuming, costly, and limited by testing conditions, making it difficult to comprehensively cover all test conditions. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a gearbox shift control strategy testing system. It uses a simulation model to replace most of the physical objects and can simulate and calculate the shifting process of a tractor under various conditions, as well as the impact and slip work generated. This enables the testing and evaluation of the shift control strategy and can effectively solve the problems in the background technology.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a transmission shift control strategy testing system, comprising:
[0006] The transmission control unit is the carrier of the shift control strategy. It is used to store and run the shift control strategy, receive driving signals and issue control signals.
[0007] A real-time simulator is a carrier of simulation models. It loads simulation models internally and can run them in real time, outputting the calculation results of the simulation models.
[0008] The shift solenoid valve is connected to the transmission control unit via a hard wire and is used to receive the drive signal from the transmission control unit and generate current.
[0009] The current acquisition board is connected to the shift solenoid valve and the real-time simulator via hardwired connections. It is used to acquire the current of the shift solenoid valve and convert the current into a digital signal for transmission to the real-time simulator.
[0010] The speed simulation board is used to simulate the speed sensor of a real vehicle, receive the speed signal output by the simulation model, output the corresponding electrical signal, and transmit it to the transmission control unit.
[0011] Analog output board, used to convert the analog signals output by the simulation model into voltage signals and transmit them to the gearbox control unit;
[0012] The host computer is electrically connected to both the real-time simulator and the gearbox control unit. It is used to edit the simulation model and load it into the real-time simulator, write the shift control strategy into the gearbox control unit, and perform test management functions.
[0013] As a preferred technical solution of this utility model, the simulation model includes an interface model and a tractor model;
[0014] The interface model is used for signal mapping and connection between the simulation model and the current acquisition board, the speed simulation board, and the analog output board.
[0015] The tractor model includes a driver command model, an engine model, a gearbox model, and a chassis model. The driver command model is used to input driving commands during testing. The engine model is used to simulate the torque output of a real engine. The gearbox model is used to simulate the shifting process of a real gearbox and to simulate and calculate the impact and slip work during the shifting process. The chassis model is used to simulate the tractor load and can simulate and calculate the driving speed.
[0016] As a preferred embodiment of this utility model, the host computer is equipped with a model editing tool, an experiment management tool, and a shift control strategy writing tool.
[0017] As a preferred embodiment of this utility model, the model editing tool is used to build and debug simulation models;
[0018] The test management tool is used to build test projects, control the test process, and view test results.
[0019] The shift control strategy writing tool is used to write the shift control strategy into the transmission control unit.
[0020] As a preferred technical solution of this utility model, the simulation signals output by the simulation model include accelerator pedal signals, brake pedal signals and gear shift signals.
[0021] Compared with the prior art, the beneficial effects of this utility model are: (1) By introducing a simulation model to replace most of the physical objects, the shifting process of the tractor can be efficiently simulated in a virtual environment, avoiding the time consumption and high cost of actual vehicle testing, and the test cycle is greatly shortened; (2) The simulation model can accurately calculate the impact and slip work generated during the shifting process, providing a scientific basis for the optimization of the shifting control strategy; (3) By reasonably setting different preset working conditions, the shifting process of the tractor under various actual use scenarios can be fully simulated, making the test more comprehensive and helping to improve the performance and adaptability of the gearbox. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the system of this utility model;
[0023] Figure 2 This is a planar schematic diagram of the simulation model. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0025] Please see Figure 1-2 This utility model provides a technical solution: a gearbox shift control strategy testing system, including a gearbox control unit, a shift solenoid valve, a current acquisition board, a speed simulation board, an analog output board, a real-time simulator, and a host computer. The gearbox control unit, the shift solenoid valve, and the host computer are physical objects, and data interaction between the physical objects and the simulation model is achieved through the boards.
[0026] The transmission control unit is the carrier of the shift control strategy. It is used to store and run the shift control strategy, receive driving signals and issue control signals.
[0027] A real-time simulator is a carrier of simulation models. It loads simulation models into its internal components and can run them in real time, outputting the calculation results of the simulation models.
[0028] The simulation model includes an interface model and a tractor model. The interface model is used for signal mapping and connection between the simulation model and the board.
[0029] The tractor model includes a driver command model, an engine model, a gearbox model, and a chassis model. The driver command model is used to input driving commands during testing. The engine model is used to simulate the torque output of a real engine. The gearbox model includes a detailed clutch and control oil circuit model, which can simulate the engagement and disengagement of the clutch during gear shifting and can simulate and calculate the impact and slip work during gear shifting. The chassis model includes a vehicle longitudinal dynamics model and a tractor traction load model, which are used to simulate tractor loads and can simulate and calculate travel speed.
[0030] The host computer is equipped with a model editing tool, an experiment management tool, and a shift control strategy writing tool. The model editing tool is used to build and debug the simulation model, the experiment management tool is used to build test projects, control the test process, and view test results, and the shift control strategy writing tool is used to write the shift control strategy into the gearbox control unit. The model editing tool and the experiment management tool are mainly used to operate the simulation model in the real-time simulator, and the shift control strategy writing tool is mainly used to transmit the shift control strategy to the gearbox control unit.
[0031] The shift solenoid valve is connected to the transmission control unit via a hard wire and is used to receive the drive signal from the transmission control unit and generate current.
[0032] The current acquisition board is connected to the shift solenoid valve and the real-time simulator via hardwired connections. It is used to acquire the current of the shift solenoid valve and convert the current into a digital signal for transmission to the real-time simulator.
[0033] The speed simulation board is used to simulate the speed sensor of a real vehicle, receive the speed signal output by the simulation model, output the corresponding electrical signal, and transmit it to the transmission control unit.
[0034] The analog output board is used to convert the analog signals output by the simulation model into voltage signals and transmit them to the transmission control unit. The analog signals include accelerator pedal signals, brake pedal signals, and shift signals.
[0035] First, the shift control strategy to be tested is written into the transmission control unit using a shift control strategy writing tool. Then, the tractor's preset operating conditions are set using a test management tool. Next, the driver's operation commands are input using the test management tool to simulate the shifting process of the tractor under the preset operating conditions. Then, the impact and sliding friction work generated by each shift are recorded using the test management tool. The impact and sliding friction work data are evaluated. If they are considered acceptable, the shift control strategy is considered effective. If they are considered unacceptable, the shift control strategy is adjusted and optimized using a shift control strategy calibration tool, and the strategy is rewritten.
[0036] Among them, the preset working conditions are multiple test conditions composed of different parameters such as traction load and road adhesion coefficient, which are reasonably set according to various working conditions that the tractor may encounter in actual use.
[0037] This invention addresses the testing and verification of clutch engagement and disengagement in shift control strategies. It also tests and verifies the response of the control strategy under extreme conditions such as overload. By combining a simulation model, physical solenoid valves, and physical control units, a complete tractor system is constructed. This system simulates the shifting process of a tractor under various operating conditions and calculates the impact and slippage work during the shifting process using the simulation model. This calculation serves as a basis for judging the suitability of the shifting strategy. Finally, through a cyclical testing process of "test → optimize → test," rapid iterative testing of the shift control strategy is achieved. A comprehensive test and evaluation of the shift control performance of a gearbox employing electro-hydraulic controlled wet multi-plate clutch technology is conducted.
[0038] The parts of the utility model not described in detail are prior art. Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A transmission shift control strategy testing system, characterized in that: include: The transmission control unit is the carrier of the shift control strategy. It is used to store and run the shift control strategy, receive driving signals and issue control signals. A real-time simulator is a carrier of simulation models. It loads simulation models internally and can run them in real time, outputting the calculation results of the simulation models. The shift solenoid valve is connected to the transmission control unit via a hard wire and is used to receive the drive signal from the transmission control unit and generate current. The current acquisition board is connected to the shift solenoid valve and the real-time simulator via hardwired connections. It is used to acquire the current of the shift solenoid valve and convert the current into a digital signal for transmission to the real-time simulator. The speed simulation board is used to simulate the speed sensor of a real vehicle, receive the speed signal output by the simulation model, output the corresponding electrical signal, and transmit it to the transmission control unit. Analog output board, used to convert the analog signals output by the simulation model into voltage signals and transmit them to the gearbox control unit; The host computer is electrically connected to both the real-time simulator and the gearbox control unit. It is used to edit the simulation model and load it into the real-time simulator, write the shift control strategy into the gearbox control unit, and perform test management functions.
2. The gearbox shift control strategy testing system according to claim 1, characterized in that: The simulation model includes an interface model and a tractor model; The interface model is used for signal mapping and connection between the simulation model and the current acquisition board, the speed simulation board, and the analog output board. The tractor model includes a driver command model, an engine model, a gearbox model, and a chassis model. The driver command model is used to input driving commands during testing. The engine model is used to simulate the torque output of a real engine. The gearbox model is used to simulate the shifting process of a real gearbox and to simulate and calculate the impact and slip work during the shifting process. The chassis model is used to simulate the tractor load and can simulate and calculate the driving speed.
3. The gearbox shift control strategy testing system according to claim 1, characterized in that: The host computer is equipped with model editing tools, test management tools, and shift control strategy writing tools.
4. The gearbox shift control strategy testing system according to claim 3, characterized in that: The model editing tool is used to build and debug simulation models; The test management tool is used to build test projects, control the test process, and view test results. The shift control strategy writing tool is used to write the shift control strategy into the transmission control unit.
5. The gearbox shift control strategy testing system according to claim 1, characterized in that: The simulation signals output by the simulation model include accelerator pedal signals, brake pedal signals, and gear shift signals.