Self-checking speed-adjustable adaptive fuzzy control motor vehicle speed-limiting system

Abstract

The application relates to the field of motor vehicle technology, in particular to a self-checking adjustable-speed adaptive fuzzy control motor vehicle speed limiting system, which comprises a speed limiter main body, the speed limiter main body is internally integrated with a microcomputer control module, a speed limiting control unit with built-in fusion adaptive control algorithm and fuzzy control algorithm, which is used for receiving real-time vehicle speed pulse signals and performing dynamic closed-loop operation to output a graded linear control instruction. A vehicle speed signal acquisition module is electrically connected with a vehicle speed sensor and is used for acquiring real-time vehicle speed pulse signals and transmitting the signals to the microcomputer control module. An actuator module is electrically connected with the microcomputer control module and is driven by the graded linear control instruction to control the throttle opening degree of the motor vehicle through telescopic pull wires. In the application, high-precision smooth control of the maximum vehicle speed is realized, and the problems of low control precision of the fixed parameter speed limiter and sudden speed limiting leading to vehicle driving jerk in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of motor vehicle technology, and in particular to a motor vehicle speed limiting system with self-testing adjustable speed adaptive fuzzy control. Background Technology

[0002] A vehicle speed limiter is a safety device that limits a vehicle's maximum speed using electronic or mechanical means. The most common type is the electronic speed limiter, while a few use mechanical structures. Electronic speed limiters monitor the vehicle's speed through the onboard ECU and, when a set threshold is reached, control the engine's fuel injection, ignition system, or transmission shifting logic to cut off excess power output. Mechanical speed limiters, on the other hand, physically limit the accelerator pedal travel. They effectively prevent traffic accidents caused by speeding and are mandatory standard equipment on commercial vehicles such as buses and trucks. Some passenger cars also come pre-installed with them for safety and regulatory requirements.

[0003] In existing technologies, speed limits for motor vehicles mostly employ fixed-parameter electronic control or simple mechanical structures. They simply cut off or significantly reduce the engine fuel supply when the vehicle speed reaches a preset value, without incorporating a dynamic adjustment algorithm that combines adaptive and fuzzy control, or adopting a graded linear throttle adjustment strategy. Furthermore, these speed limiters are often vehicle-specific designs, lacking a universal DIP switch-type speed pulse matching unit. They only have basic fault alarm functions, and the hardware mostly uses civilian-grade components. They lack integrated dual self-checking and multi-fault type identification mechanisms, as well as industrial-grade wide-temperature vibration-resistant structures. This results in low speed limit control accuracy, sudden speed limits causing vehicle jerking, poor vehicle compatibility, high failure rates under harsh conditions, and difficulties in fault location. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides the following technical solution: A self-testing, adjustable-speed, adaptive fuzzy control vehicle speed limiting system includes: a speed limiter body, wherein the speed limiter body integrates: The microcomputer control module has a built-in speed limit control unit that integrates adaptive control algorithm and fuzzy control algorithm. It is used to receive real-time vehicle speed pulse signals, perform dynamic closed-loop calculations, and output hierarchical linear control commands.

[0005] The vehicle speed signal acquisition module is electrically connected to the original vehicle speed sensor and is used to acquire real-time vehicle speed pulse signals and transmit them to the microcomputer control module.

[0006] The actuator module is electrically connected to the microcomputer control module and is driven by the hierarchical linear control command. It controls the throttle opening of the motor vehicle through a telescopic cable.

[0007] The dual self-test module is electrically connected to the microcomputer control module and includes a power-on self-test unit and a real-time operation self-test unit. The power-on self-test unit is used to detect the electrical connection and functional integrity of each hardware module when the system is powered on and started. The real-time operation self-test unit is used to monitor the validity of the vehicle speed signal and the position status of the actuator throughout the entire operation cycle.

[0008] The audible and visual alarm module is electrically connected to the microcomputer control module. When the dual self-test module detects an abnormal state, it receives the trigger command from the microcomputer control module and simultaneously sends out light and sound warning signals to the driver.

[0009] The power management module is electrically connected to the vehicle's original DC power supply and is used to power all modules.

[0010] The above technical solution employs a modular integrated design, consolidating core control, signal acquisition, and execution drive functions within the speed limiter body, resulting in a compact structure and convenient installation. By integrating adaptive and fuzzy control algorithms into dynamic closed-loop calculations, it can accurately output hierarchical linear control commands, avoiding the abrupt intervention of traditional mechanical speed limiting and achieving smooth speed limiting.

[0011] As an improvement to the above technical solution: The speed limit control unit built into the microcomputer control module has a continuously adjustable speed limit range of 60 to 120 kilometers per hour, and gradually reduces the engine fuel supply only when the vehicle speed reaches 90% to 95% of the preset speed limit value, so as to control the final speed limit deviation to not exceed ±2 kilometers per hour.

[0012] The above technical solution covers the mainstream speed limit requirements for commercial vehicles, supporting continuous adjustment from 60 to 120 kilometers per hour. It intervenes gradually only when the vehicle speed approaches the speed limit, ensuring complete freedom of operation of the accelerator pedal within the speed limit range while controlling the speed limit deviation within plus or minus 2 kilometers per hour, thus balancing driving experience and road safety.

[0013] As an improvement to the above technical solution: The vehicle speed signal acquisition module integrates a vehicle speed pulse matching unit. The vehicle speed pulse matching unit adjusts the pulse counting parameters through a DIP switch to adapt to the vehicle speed pulse output characteristics of different types of motor vehicles.

[0014] The above technical solution, by physically adjusting the pulse counting parameters through a DIP switch, can quickly adapt to the speed pulse output characteristics of different brands and models of motor vehicles without modifying the original vehicle circuit or flashing the software, greatly reducing the difficulty and time cost of installation and debugging, and significantly improving the vehicle versatility of the system.

[0015] As an improvement to the above technical solution: The microcomputer control module also has a built-in software watchdog unit, which is used to monitor the running status of the speed limit control program in real time, automatically filter electromagnetic interference signals, and automatically reset and restart when the program malfunctions.

[0016] The above technical solution uses a software watchdog unit to monitor the program's running status in real time, automatically filtering out interference signals such as electromagnetic radiation and noise inside the vehicle. When the program malfunctions and runs out of control, it immediately resets and restarts automatically, preventing accidental triggering of speed limits or system crashes, and ensuring stable operation of the system around the clock.

[0017] As an improvement to the above technical solution: All electronic components of the speed limiter body are of industrial grade, the core control chip is an original imported microcomputer chip, and the overall structure has been designed to resist vibration and strengthen it to meet the wide temperature working environment of -40 degrees to +85 degrees, as well as the vibration resistance requirements of 20 to 50 Hz frequency and 1 gram acceleration.

[0018] The above technical solution adopts industrial-grade electronic components and a reinforced structural design, and can work normally under extreme temperatures ranging from -40 degrees Celsius to +85 degrees Celsius and vibration conditions with frequencies of 20 to 50 Hz and accelerations equal to the force of gravity, making it perfectly suited for various complex operating scenarios of commercial vehicles.

[0019] As an improvement to the above technical solution: The microcomputer control module has a built-in fault diagnosis unit, which is used to identify fault types including fuse blowout, loose cable, broken cable, missing vehicle speed signal, and actuator failure, and controls the audible and visual alarm module to output audible and visual combination signals of different frequencies according to different fault types.

[0020] The above technical solution has a built-in standardized fault diagnosis database, which can accurately identify a variety of common fault types and distinguish them through a combination of sound and light signals of different frequencies, helping drivers to quickly understand the fault status and significantly shortening the fault diagnosis and repair time for maintenance personnel.

[0021] As an improvement to the above technical solution: The actuator module's cable output end is connected to the vehicle's original throttle cable via a detachable cable locking block, which is equipped with an anti-loosening fastening structure.

[0022] The above technical solution adopts a detachable cable locking block structure, which eliminates the need to replace the original throttle cable during installation and removal, making the operation simple and efficient. The matching anti-loosening fastening structure can effectively resist continuous vibration during vehicle operation, prevent cable displacement or detachment, and ensure long-term reliability of throttle control.

[0023] As an improvement to the above technical solution: The power management module has a 5A fuse connected in series at its power input terminal, and the power management module has a wide voltage input adaptation range of 20 to 28 volts. It also integrates a low-power control unit, with a system standby current of no more than 40 mA and a maximum operating current of no more than 1 A.

[0024] The above technical solution uses a five-amp fuse to achieve overcurrent protection, preventing damage to the original vehicle circuitry. The 20 to 28 volt wide voltage input adapts to vehicle voltage fluctuations, and the low power consumption design controls the standby current to within 40 milliamps, completely solving the problem of battery depletion caused by long-term vehicle parking.

[0025] As an improvement to the above technical solution: It also includes a vehicle speed warning indicator that is electrically connected to the microcomputer control module.

[0026] When the real-time vehicle speed reaches 90% of the preset speed limit, the vehicle speed warning indicator light will remain on.

[0027] When the real-time vehicle speed reaches the preset speed limit, the vehicle speed warning indicator flashes, and at the same time, the sound and light alarm module is triggered to issue an audible warning.

[0028] The aforementioned technical solution adds an independent speed warning indicator light to implement a tiered warning mechanism. The light stays constantly on to remind the driver to slow down, and when the speed limit is reached, it switches to flashing lights accompanied by an audible warning, preventing panic caused by sudden speed limits and further improving driving safety.

[0029] The beneficial effects of this invention are: 1. In this invention, a speed limit control unit with built-in integrated adaptive control algorithm and fuzzy control algorithm is used to gradually reduce the engine fuel supply when the vehicle speed approaches the preset speed limit value. This achieves high-precision and stable control of the vehicle's maximum speed, solving the problems of low control accuracy and sudden speed limit causing vehicle jerking in the prior art.

[0030] 2. In this invention, by integrating a DIP switch-adjustable vehicle speed pulse matching unit, a dual self-test module for power-on and real-time operation, and a fault diagnosis unit for fault type identification, combined with an industrial-grade wide-temperature and vibration-resistant hardware structure, rapid adaptation to multiple vehicle models and reliable operation throughout the entire system cycle are achieved. This solves the problems of poor vehicle model compatibility, high failure rate during operation, and unclear fault type indication in the prior art. Attached Figure Description

[0031] Figure 1 This is a diagram of the installation system of the present invention; Figure 2 This is a schematic diagram of the speed limiter in this invention; Figure 3This is a system architecture diagram of the present invention; Figure 4 This is a system flowchart of the present invention. Detailed Implementation

[0032] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0033] See appendix Figure 1 To be continued Figure 4 A self-testing, adjustable-speed, adaptive fuzzy control vehicle speed limiting system includes: a speed limiter body, which integrates the following: The microcomputer control module has a built-in speed limit control unit that integrates adaptive control algorithm and fuzzy control algorithm. It is used to receive real-time vehicle speed pulse signals, perform dynamic closed-loop calculations, and output hierarchical linear control commands.

[0034] The vehicle speed signal acquisition module is electrically connected to the vehicle speed sensor and is used to acquire real-time vehicle speed pulse signals and transmit them to the microcomputer control module.

[0035] The actuator module is electrically connected to the microcomputer control module and is driven by hierarchical linear control commands. It controls the throttle opening of the motor vehicle through a telescopic cable.

[0036] The dual self-test module is electrically connected to the microcomputer control module. The dual self-test module includes a power-on self-test unit and a real-time operation self-test unit. The power-on self-test unit is used to detect the electrical connection of each hardware module when the system is powered on and started. The real-time operation self-test unit is used to monitor the validity of the vehicle speed signal and the position status of the actuator throughout the entire operation cycle.

[0037] The audible and visual alarm module is electrically connected to the microcomputer control module. When the dual self-test module detects an abnormal state, it receives the trigger command from the microcomputer control module and simultaneously sends out light and sound warning signals to the driver.

[0038] The power management module is electrically connected to the vehicle's original DC power supply and is used to power all modules.

[0039] In one embodiment, after system startup, the vehicle speed signal acquisition module acquires real-time vehicle speed pulse signals and transmits them to the microcomputer control module. The microcomputer control module integrates adaptive control algorithms and fuzzy control algorithms to perform dynamic closed-loop calculations and outputs hierarchical linear control commands. After receiving the commands, the actuator module controls the throttle opening of the vehicle via a telescopic cable to limit the vehicle's maximum speed. The dual self-test module detects the electrical connections of each hardware module when the system is powered on and continuously monitors the validity of the vehicle speed signal and the position status of the actuators throughout the entire operating cycle. If an abnormal state is detected, the microcomputer control module triggers the light and sound alarm module to simultaneously issue light and sound warning signals. The power management module provides a stable power supply to all modules of the system. The following is the system's adaptive fuzzy output formula: .

[0040] Formula Explanation: The throttle opening adjustment amount output by the controller. Speed ​​error To preset the speed limit, For real-time vehicle speed, , The adaptive proportional and integral coefficients are dynamically adjusted based on vehicle speed errors.

[0041] : Fuzzy control output item, input is error and Output compensation amount The formula, which uses fuzzy weighting factors, indicates that the output command integrates linear PID and nonlinear fuzzy logic to achieve hierarchical closed-loop control.

[0042] See appendix Figure 1 To be continued Figure 4 The speed limit control unit built into the microcomputer control module has a continuously adjustable speed limit range of 60 to 120 kilometers per hour, and gradually reduces the engine fuel supply only when the vehicle speed reaches 90% to 95% of the preset speed limit value, so as to control the final speed limit deviation to not exceed ±2 kilometers per hour.

[0043] In one embodiment, the speed limit control unit supports a continuously adjustable speed limit range of 60 to 120 kilometers per hour. When the vehicle speed rises to 90% to 95% of the preset speed limit value, the speed limit control unit begins to gradually reduce the engine fuel supply and stabilizes the vehicle's maximum speed near the preset value by linearly adjusting the throttle opening. Ultimately, it controls the deviation between the actual vehicle speed and the preset speed limit value to not exceed ±2 kilometers per hour, while ensuring free operation of the accelerator pedal within the speed limit range.

[0044] See appendix Figure 1 To be continued Figure 4The vehicle speed signal acquisition module integrates a vehicle speed pulse matching unit. The vehicle speed pulse matching unit adjusts the pulse counting parameters through a DIP switch to adapt to the vehicle speed pulse output characteristics of different vehicle models.

[0045] In one embodiment, the vehicle speed pulse matching unit adjusts the pulse counting parameters via a DIP switch to adapt to the vehicle speed pulse output characteristics of different vehicle models. This enables the vehicle speed signal acquisition module to accurately identify and convert the pulse signal output by the original vehicle speed sensor, ensuring that the real-time vehicle speed data acquired by the microcomputer control module is completely consistent with the actual vehicle speed. The following is the pulse-vehicle speed conversion and adaptation formula: .

[0046] Formula Explanation: Calculated real-time vehicle speed During the sampling time window The number of pulses collected within (seconds) Vehicle characteristic parameters, number of pulses per kilometer.

[0047] See appendix Figure 1 To be continued Figure 4 The microcomputer control module also has a built-in software watchdog unit, which is used to monitor the running status of the speed limit control program in real time, automatically filter electromagnetic interference signals, and automatically reset and restart when the program malfunctions.

[0048] In one embodiment, the software watchdog unit monitors the running status of the speed limit control program in real time and continuously scans the program execution flow. When it detects program abnormalities, instruction errors, or infinite loops caused by electromagnetic interference, it automatically filters out invalid interference signals and triggers an automatic program reset and restart, enabling the system to quickly return to normal operation and ensuring the continuity and reliability of the speed limit control function. The following is the watchdog reset timing constraint formula: .

[0049] Formula Explanation: The time interval for the periodic "feeding the dog" operation in the main program loop. The overflow reset cycle of the watchdog timer. This formula defines the maximum blocking time caused by electromagnetic interference, preventing program crashes or infinite loops. It ensures the system won't reset incorrectly under normal conditions and can withstand abnormal events. Internal forced reset, filtering out invalid interference signals.

[0050] See appendix Figure 1 To be continued Figure 4All electronic components of the speed limiter are of industrial grade, and the core control chip is an original imported microcomputer chip. The overall structure has been designed to be vibration-resistant and reinforced to meet the wide temperature range of -40 degrees to +85 degrees Celsius, as well as the vibration resistance requirements of 20 to 50 Hz frequency and 1 gram acceleration.

[0051] In one embodiment, the speed limiter body is manufactured using industrial-grade electronic components, and the core control chip is an original imported microcomputer chip. The overall structure has undergone vibration-resistant reinforcement design. The system can operate stably in a wide temperature range of -40℃ to +85℃, and can withstand vibration impacts with frequencies of 20 to 50 Hz and accelerations of 1 gram, adapting to the long-term use requirements of various complex roads and harsh working conditions.

[0052] See appendix Figure 1 To be continued Figure 4 The microcomputer control module has a built-in fault diagnosis unit, which is used to identify fault types including fuse blowout, loose cable, broken cable, missing vehicle speed signal, and actuator failure, and controls the audible and visual alarm module to output audible and visual combination signals of different frequencies according to different fault types.

[0053] In one embodiment, the fault diagnosis unit continuously monitors the operating status of each component of the system and can automatically identify various fault types, such as blown fuses, loose cables, broken cables, missing vehicle speed signals, and actuator malfunctions. For different fault types, the fault diagnosis unit sends corresponding fault codes to the microcomputer control module. The microcomputer control module then controls the audible and visual alarm module to output combined audible and visual signals of different frequencies based on the fault codes, providing a clear indication of the specific fault type to the driver.

[0054] See appendix Figure 1 To be continued Figure 4 The actuator module's cable output end is connected to the vehicle's original throttle cable via a detachable cable locking block, which has an anti-loosening fastening structure.

[0055] In one embodiment, the cable output end of the actuator module is connected to the original throttle cable of the vehicle through a detachable cable locking block. The cable locking block is equipped with an anti-loosening fastening structure, which can withstand continuous tension and vibration during vehicle operation, prevent the cable connection from loosening, and ensure the accuracy and stability of throttle opening control.

[0056] See appendix Figure 1 To be continued Figure 4 The power management module has a 5A fuse connected in series at its power input terminal. It also has a wide voltage input range of 20 to 28 volts and integrates a low-power control unit. The system standby current is no more than 40 mA and the maximum operating current is no more than 1 A.

[0057] In one embodiment, the power management module is connected to the vehicle's original DC power supply, with a 5-amp fuse connected in series at the input for overcurrent protection. The module supports a wide voltage input range of 20 to 28 volts, making it compatible with the power systems of different vehicle models. It also integrates a low-power control unit, ensuring that the system's standby current does not exceed 40 mA and its maximum operating current does not exceed 1 amp, effectively reducing the vehicle's static and operational power consumption.

[0058] See appendix Figure 1 To be continued Figure 4 It also includes a vehicle speed warning indicator that is electrically connected to the microcomputer control module; When the real-time vehicle speed reaches 90% of the preset speed limit, the speed warning indicator light will remain on. When the real-time vehicle speed reaches the preset speed limit, the speed warning indicator light flashes, and at the same time, the sound and light alarm module is triggered to issue an audible warning.

[0059] In one embodiment, the vehicle speed warning indicator light is linked with the microcomputer control module. When the vehicle's real-time speed reaches 90% of the preset speed limit, the indicator light remains constantly on to remind the driver in advance that the speed limit is about to be reached. When the vehicle speed reaches the preset speed limit, the indicator light switches to a flashing state and triggers the light and sound alarm module to emit an audible warning, thereby enhancing the speed limit reminder effect for the driver.

[0060] The above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit it. Anyone skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A self-checking, adjustable speed, adaptive fuzzy control motor vehicle speed limiting system, characterized in that, include: Speed ​​limiter body, wherein the speed limiter body integrates: The microcomputer control module has a built-in speed limit control unit that integrates adaptive control algorithm and fuzzy control algorithm. It is used to receive real-time vehicle speed pulse signal and perform dynamic closed-loop calculation, and output hierarchical linear control command. The vehicle speed signal acquisition module is electrically connected to the vehicle speed sensor and is used to acquire real-time vehicle speed pulse signals and transmit them to the microcomputer control module. The actuator module is electrically connected to the microcomputer control module and is driven by the hierarchical linear control command. It controls the throttle opening of the motor vehicle through a telescopic cable. The dual self-test module is electrically connected to the microcomputer control module. The dual self-test module includes a power-on self-test unit and a real-time operation self-test unit. The power-on self-test unit is used to detect the electrical connection of each hardware module when the system is powered on and started. The real-time operation self-test unit is used to monitor the validity of the vehicle speed signal and the position status of the actuator throughout the entire operation cycle. The audible and visual alarm module is electrically connected to the microcomputer control module and is used to receive the trigger command from the microcomputer control module when the dual self-test module detects an abnormal state, and at the same time send out light and sound warning signals to the driver. The power management module is electrically connected to the vehicle's original DC power supply and is used to power all modules.

2. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The speed limit control unit built into the microcomputer control module has a continuously adjustable speed limit range of 60 to 120 kilometers per hour, and gradually reduces the engine fuel supply only when the vehicle speed reaches 90% to 95% of the preset speed limit value, so as to control the final speed limit deviation to not exceed ±2 kilometers per hour.

3. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The vehicle speed signal acquisition module integrates a vehicle speed pulse matching unit. The vehicle speed pulse matching unit adjusts the pulse counting parameters through a DIP switch to adapt to the vehicle speed pulse output characteristics of different types of motor vehicles.

4. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The microcomputer control module also has a built-in software watchdog unit, which is used to monitor the running status of the speed limit control program in real time, automatically filter electromagnetic interference signals, and automatically reset and restart when the program malfunctions.

5. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: All electronic components of the speed limiter body are of industrial grade, the core control chip is an original imported microcomputer chip, and the overall structure has been designed to resist vibration and strengthen it to meet the wide temperature working environment of -40 degrees to +85 degrees, as well as the vibration resistance requirements of 20 to 50 Hz frequency and 1 gram acceleration.

6. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The microcomputer control module has a built-in fault diagnosis unit, which is used to identify fault types including fuse blowout, loose cable, broken cable, missing vehicle speed signal, and actuator failure, and controls the audible and visual alarm module to output audible and visual combination signals of different frequencies according to different fault types.

7. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The actuator module's cable output end is connected to the vehicle's original throttle cable via a detachable cable locking block, which is equipped with an anti-loosening fastening structure.

8. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: The power management module has a 5A fuse connected in series at its power input terminal, and the power management module has a wide voltage input adaptation range of 20 to 28 volts. It also integrates a low-power control unit, with a system standby current of no more than 40 mA and a maximum operating current of no more than 1 A.

9. The self-testing adjustable speed adaptive fuzzy control motor vehicle speed limiting system according to claim 1, characterized in that: It also includes a vehicle speed warning indicator that is electrically connected to the microcomputer control module; When the real-time vehicle speed reaches 90% of the preset speed limit, the vehicle speed warning indicator light will remain on. When the real-time vehicle speed reaches the preset speed limit, the vehicle speed warning indicator flashes, and at the same time, the sound and light alarm module is triggered to issue an audible warning.

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