Vehicle-mounted control system based on motor home unilateral space expansion device

Abstract

The invention discloses a vehicle-mounted control system based on a motor home single-side space expansion device. The vehicle-mounted control system comprises a main controller, a remote controller, an external key, a first driving motor, a second driving motor, a power circuit and a sound-light alarm unit. By means of the unilateral directional extension design, the single-side directional extension device adapts to limited scenes such as narrow camps, is light in structure, greatly reduces the influence on the running balance of the motor home, and is particularly suitable for a pull-type motor home; by means of a single-side three-rail guide structure and a dual-motor synchronous control mechanism, the levelness deviation of the expanded cabin body is effectively reduced, and the stability is remarkably improved; manual inching precise fine adjustment and automatic one-key complete stretching and retracting are supported, any distance expansion can be achieved, the multi-scene space requirements of resting, storage and the like are met, and the operation flexibility is high; meanwhile, complete safety protection systems including motor state monitoring, power supply overvoltage and undervoltage protection, intelligent anti-pinch and anti-collision, long-time standing child lock and the like are integrated, and the risks of short circuit, pinch injury, misoperation and the like can be recognized and avoided in real time.

Description

Technical Field

[0001] This invention relates to the field of RV single-side space expansion device technology, and more particularly to an on-board control system based on RV single-side space expansion device. Background Technology

[0002] Existing RV space expansion systems mostly adopt a dual-sided expansion structure. This structure has problems such as complex design and limited applicable scenarios. Dual-sided expansion requires expansion mechanisms to be set on both sides of the RV, which not only increases the overall weight of the RV, but also affects the balance performance during the RV's movement. Moreover, it is difficult to deploy smoothly in narrow campsites, roads, and other scenarios. In addition, the stability, safety, and operational flexibility of existing expansion control systems need to be improved. They lack a complete fault detection and safety protection mechanism, and are prone to equipment damage or safety hazards due to abnormal voltage, motor failure, or misoperation. In view of the above, this application proposes an on-board control system based on a single-sided RV space expansion device. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes an on-board control system based on a single-sided space expansion device for motorhomes.

[0004] The present invention proposes an on-board control system based on a single-sided space expansion device for RVs, comprising a main controller, a remote controller, external buttons, a first drive motor, a second drive motor, a power circuit, and an audible and visual alarm unit. The main controller has a built-in main control board, and two motor control interfaces, a pairing button, an external button interface, and a power interface are led out from the main controller. The two motor control interfaces are respectively connected to the first drive motor and the second drive motor, the external button interface is connected to the external button, the power interface is connected to the power circuit, and the pairing button is paired with the remote controller.

[0005] The audible and visual alarm unit includes a buzzer and an indicator light.

[0006] Preferably, the power supply circuit includes a power supply, a reverse connection protection unit, and a two-stage DC step-down unit. The power supply is a vehicle-mounted 12V battery. The reverse connection protection unit adopts a PMOS transistor design and is connected to the power input terminal to prevent reverse power supply from damaging the main control board components. The two-stage DC step-down unit includes a first-stage chip and a second-stage chip. The first stage uses an XL1509-5.0 chip to convert the 12V input voltage to 5V, and the second stage uses an AMS1117-3.3 chip to further convert the 5V voltage to 3.3V to adapt to the different voltage requirements of various functional modules of the system and provide a stable operating voltage.

[0007] Preferably, the main control board uses a control chip of model GD32F103C8T6, and integrates a crystal oscillator circuit, a detection circuit and a motor drive control circuit; the crystal oscillator circuit is composed of an external passive crystal oscillator of model X32258MOB4S and a matching peripheral starting capacitor, which provides a stable clock signal for the main control board.

[0008] The detection circuit includes two motor current detection branches and one power supply voltage detection branch. Each detection branch uses an LM324DT multiplex operational amplifier. When the motor current detection branch detects the motor current, it acquires the driving motor operating current signal through a sampling resistor. After being amplified by the operational amplifier, the output voltage range is limited by a clamping diode circuit, and finally input to the analog signal acquisition interface of the control chip to achieve real-time monitoring of the motor operating current. When the power supply voltage detection branch detects the power supply voltage, it divides the supply voltage through a voltage divider resistor to obtain a small-amplitude voltage signal. After being amplified by an operational amplifier and clamped, the signal is input to the control chip to achieve real-time monitoring of the supply voltage.

[0009] The motor drive control circuit is adapted to a 28W brushless DC motor. It controls the motor power by adjusting the PWM duty cycle through the on / off state of the MOSFET, and controls the forward and reverse rotation of the motor by switching four relays. When the system is in full-power operation, the rated operating current of a single brushless DC motor is about 5A, and the maximum operating current can reach about 15A.

[0010] Preferably, the main control board also integrates a voltage detection module. The voltage detection module is used to continuously collect the voltage signal of the power supply circuit and monitor it in real time. When the power supply voltage exceeds the preset normal operating range, the main control board automatically outputs a stop command for the extension mechanism, prohibiting the extension operation. At the same time, it triggers the action of the sound and light alarm unit, which realizes the abnormal status warning through a combination of buzzer sound and red indicator light illumination, so as to prevent the extension mechanism from malfunctioning or the core components from being damaged due to abnormal voltage.

[0011] Preferably, the remote control has a built-in control board, which is powered by two 1.5V dry batteries. The remote control is equipped with wake-up, pairing, jog extension, jog retraction, one-key extension, one-key retraction, stop, and unlock function buttons. The remote control has a built-in intelligent sleep mechanism, which automatically enters a low-power sleep state after 10 seconds of no button operation. Pressing the wake-up button can activate the device and restore normal control functions.

[0012] Preferably, a stable wireless communication link is established between the main controller board and the remote controller board using a WL500B RF chip, supporting an effective communication distance of up to approximately 8 meters. Control commands can only be transmitted and executed after the remote controller board and the main controller board have completed pairing and authentication.

[0013] Preferably, the system has three operating modes: manual mode, automatic mode, and emergency mode, specifically:

[0014] Manual mode is activated by pressing and holding the external button or the jog button on the remote control. The system stops immediately when the button is released, enabling precise and controllable step-by-step operation.

[0015] In automatic mode, the extension mechanism will automatically operate by pressing the one-button extension or retraction command button. When the extension mechanism reaches the preset position, it will be stopped by detecting the motor stall current.

[0016] The emergency mode can be activated by pressing the configuration button 5 times consecutively. When activated, the buzzer will prompt the operator at the set frequency. This mode uses a momentary control method and does not execute the synchronous command of the two motors. The motors run at full power output, which is suitable for emergency operation needs in special scenarios.

[0017] Preferably, the system also includes a safety protection system, which comprises a motor status monitoring module, a power protection module, an intelligent anti-pinch and anti-collision control module, and a child lock module. The motor status monitoring module collects motor current and communication signals, identifies short circuits, open circuits, and communication interruption faults, and triggers shutdown protection upon detecting abnormalities. The power protection module monitors the power supply circuit voltage, presets overvoltage and undervoltage thresholds, and cuts off the drive power to the expansion mechanism when the voltage exceeds the normal range. Simultaneously, it links with the main control system to prohibit the output of operation commands, preventing abnormal voltage from impacting the main control chip and sensor core components, and ensuring the stability of the circuit system. The intelligent anti-pinch and anti-collision control module samples and monitors the current along the operating path of the expansion mechanism. In case of abnormalities, it immediately executes an emergency stop command, effectively avoiding collision damage or personnel pinching risks, and improving personal and equipment safety during operation. The child lock module automatically activates the child lock function when the expansion mechanism has not been operated for a long time, locking all operation commands.

[0018] Compared with existing technologies, the beneficial effects of this invention are:

[0019] This invention features a unilateral directional expansion design, adaptable to confined environments such as narrow campsites, and boasts a lightweight structure, significantly reducing its impact on the RV's driving balance, making it particularly suitable for towable RVs. Utilizing a unilateral three-rail guide structure and a dual-motor synchronous control mechanism, the horizontal deviation of the expanded cabin is effectively reduced, significantly improving stability. It supports precise manual adjustment and automatic one-button full extension, enabling expansion to any distance to meet various space needs such as rest and storage, offering high operational flexibility. Simultaneously, it integrates a comprehensive safety protection system including motor status monitoring, power over / under voltage protection, intelligent anti-pinch and anti-collision features, and a child lock for prolonged static periods. This system can identify and mitigate risks such as short circuits, pinching injuries, and misoperation in real time, effectively ensuring equipment and personnel safety. Compared to traditional dual-sided expansion control systems, it offers significant advantages in scene adaptability, operational stability, operational flexibility, and safety protection. Attached Figure Description

[0020] Figure 1 This is a block diagram of an onboard control system based on a single-sided space extension device for a motorhome, as proposed in this invention.

[0021] Figure 2 This is a flowchart of an onboard control system based on a single-sided space expansion device for motorhomes, as proposed in this invention. Detailed Implementation

[0022] The present invention will be further explained below with reference to specific embodiments.

[0023] Example

[0024] Reference Figure 1-2 This embodiment proposes an onboard control system based on a single-sided space extension device for RVs, including a main controller, a remote control, external buttons, drive motor one, drive motor two, a power supply circuit, and an audible and visual alarm unit. The main controller has a built-in main control board.

[0025] The main control board uses a control chip of model GD32F103C8T6. The main control board integrates a crystal oscillator circuit, a detection circuit and a motor drive control circuit. The crystal oscillator circuit is composed of an external passive crystal oscillator of model X32258MOB4S and a matching peripheral starting capacitor, which provides a stable clock signal for the main control board.

[0026] The detection circuit includes two motor current detection branches and one power supply voltage detection branch. Each detection branch uses an LM324DT multiplex operational amplifier. When the motor current detection branch detects the motor current, it acquires the driving motor operating current signal through a sampling resistor. After being amplified by the operational amplifier, the output voltage range is limited by a clamping diode circuit, and finally input to the analog signal acquisition interface of the control chip to achieve real-time monitoring of the motor operating current. When the power supply voltage detection branch detects the power supply voltage, it divides the supply voltage through a voltage divider resistor to obtain a small-amplitude voltage signal. After being amplified by an operational amplifier and clamped, the signal is input to the control chip to achieve real-time monitoring of the supply voltage.

[0027] The motor drive control circuit is compatible with a 28W brushless DC motor. It adjusts the PWM duty cycle by switching the on and off states of the MOSFET to achieve motor power control, and controls the forward and reverse rotation of the motor by switching four relays. When the system is in full-power operation, the rated operating current of a single brushless DC motor is about 5A, and the maximum operating current can reach about 15A.

[0028] The main controller has two motor control interfaces, one pairing button, one external button interface, and one power interface. The two motor control interfaces are connected to drive motor one and drive motor two respectively. The external button interface is connected to the external button. The power interface is connected to the power circuit. The pairing button is paired with the remote control.

[0029] The main control board also integrates a voltage detection module, which is used to continuously collect the voltage signal of the power supply circuit and monitor it in real time. When the power supply voltage exceeds the preset normal operating range, the main control board automatically outputs a stop command for the extension mechanism, prohibiting the extension operation. At the same time, it triggers the action of the sound and light alarm unit, which uses a combination of buzzer sound and red indicator light to realize the abnormal status warning, so as to prevent the extension mechanism from malfunctioning or the core components from being damaged due to abnormal voltage.

[0030] The audible and visual alarm unit includes a buzzer and an indicator light;

[0031] The power supply circuit includes a power supply, a reverse connection protection unit, and a two-stage DC step-down unit. The power supply is a 12V vehicle battery. The reverse connection protection unit uses a PMOS transistor design and is connected to the power input terminal to prevent reverse power supply from damaging the main control board components. The two-stage DC step-down unit includes a first-stage chip and a second-stage chip. The first stage uses an XL1509-5.0 chip to convert the 12V input voltage to 5V, and the second stage uses an AMS1117-3.3 chip to further convert the 5V voltage to 3.3V to adapt to the different voltage requirements of various functional modules of the system and provide a stable operating voltage.

[0032] The remote control has a built-in control board, which is powered by two 1.5V dry batteries. The remote control is equipped with wake-up, pairing, jog extension, jog retraction, one-key extension, one-key retraction, stop and unlock function buttons. The remote control has a built-in intelligent sleep mechanism. After stopping button operation for 10 seconds, it will automatically enter a low-power sleep state. Pressing the wake-up button will activate the device and restore normal control functions.

[0033] The main controller board and the remote controller board use a WL500B RF chip to build a stable wireless communication link, supporting an effective communication distance of up to about 8 meters. Control commands can only be transmitted and executed after the remote controller board and the main controller board have completed pairing and authentication.

[0034] The system has three operating modes: manual mode, automatic mode, and emergency mode, as follows:

[0035] Manual mode is activated by pressing and holding the external button or the jog button on the remote control. The system stops immediately when the button is released, enabling precise and controllable step-by-step operation.

[0036] In automatic mode, the extension mechanism will automatically operate by pressing the one-button extension or retraction command button. When the extension mechanism reaches the preset position, it will be stopped by detecting the motor stall current.

[0037] The emergency mode can be switched and activated by pressing the configuration button 5 times in a row. When activated, the buzzer will prompt the operator at the set frequency. This mode adopts the inching control method and does not execute the synchronous command of the two motors. The motors run at full power output, which is suitable for emergency operation needs in special scenarios.

[0038] This embodiment features a unilateral directional expansion design, adaptable to confined scenarios such as narrow campsites. Its lightweight structure significantly reduces the impact on the RV's balance, making it particularly suitable for towable RVs. Utilizing a unilateral three-rail guide structure and a dual-motor synchronous control mechanism, the horizontal deviation of the expanded cabin is effectively reduced, significantly improving stability. It supports precise manual adjustment and automatic one-button full extension, enabling expansion to any distance to meet various space needs such as rest and storage, offering high operational flexibility. Simultaneously, it integrates a comprehensive safety protection system including motor status monitoring, power over / under voltage protection, intelligent anti-pinch and anti-collision features, and a child lock for prolonged static periods. This system can identify and mitigate risks such as short circuits, pinching injuries, and misoperation in real time, effectively ensuring equipment and personnel safety. Compared to traditional dual-sided expansion control systems, it offers significant advantages in scenario adaptability, operational stability, operational flexibility, and safety protection.

[0039] This embodiment also includes a safety protection system, which comprises a motor status monitoring module, a power protection module, an intelligent anti-pinch and anti-collision control module, and a child lock module. The motor status real-time monitoring module is used to collect motor current and communication signals, identify short circuit, open circuit, and communication interruption faults, and trigger shutdown protection upon detection of abnormalities. The power protection module is used to monitor the voltage of the power supply circuit, preset overvoltage and undervoltage thresholds, and cut off the drive power of the expansion mechanism when the voltage exceeds the normal range. At the same time, it links with the main control system to prohibit the output of operation commands, preventing abnormal voltage from impacting the main control chip and sensor core components, and ensuring the stability of the circuit system. The intelligent anti-pinch and anti-collision control module is used to sample and monitor the current along the operating path of the expansion mechanism. In case of abnormality, it immediately executes an emergency stop command, effectively avoiding collision damage or personnel pinching risks, and improving personal and equipment safety during operation. The child lock module automatically activates the child lock function when the expansion mechanism has not been operated for a long time, locking all operation commands.

[0040] In this embodiment, after the control system is powered on, it is powered by the vehicle's 12V battery. After reverse connection protection and two-stage voltage reduction, it powers each module. First, it enters the initialization stage. The main control board starts up, the crystal oscillator circuit starts working, providing a stable clock signal. At the same time, the detection circuit is initialized, and the continuity of the two motor current detection branches and the one power supply voltage detection branch is checked to ensure that the subsequent parameter acquisition is valid. The motor drive circuit performs a self-test, and the main control board sends a test signal to the relay to verify whether the motor forward and reverse control link is normal. At the same time, the connection status between the extended motor and the controller is checked. Then, the wireless communication link is initialized, the WL500B RF chip starts up, and the pairing of the controller and remote control is checked. The audible and visual alarm unit performs a self-test, briefly triggering the buzzer and lights to confirm that the alarm function is normal. If any fault is found during the initialization process, the system directly enters the "fault stop" state and triggers the audible and visual alarm; if there is no abnormality, it enters the "standby state" and waits for operation instructions.

[0041] In standby mode, the system monitors the source of two types of operation commands in real time to determine whether to trigger subsequent actions. When there is no button operation, if no signal is detected from the remote control or external button, the system remains in standby mode and starts the "child lock timer". When there is button operation, if a button signal is detected, the system first verifies the legality of the command. If the command is legal, it enters the "mode judgment" stage, and if the command is illegal, it is ignored and a prompt is displayed.

[0042] The system determines whether to enter manual mode, automatic mode, or emergency mode based on the type of button signal. The core judgment logic is as follows:

[0043] 1. Emergency mode trigger: The system will be in emergency mode only when the configuration button is pressed 5 times in a row. At this time, the buzzer will sound at the set frequency and the "emergency mode control logic" will be executed.

[0044] 2. Automatic mode trigger: Except for emergency mode, all other button signals correspond to normal mode, and the "normal mode control logic" will be executed subsequently;

[0045] In normal mode, manual and automatic drives are synchronized. Manual mode is suitable for scenarios requiring fine-tuning of the extension distance. Its operating logic is "press to start, release to stop." The main control board receives the "extend / retract" button signal and sends drive commands to the two extension motors. The motor drive circuit adjusts the PWM duty cycle through MOSFETs and switches the direction via relays to drive the motors. Hall sensors collect the speed and rotation count of the two motors in real time and feed this data back to the main control board. The main control board compares the travel data of both motors and dynamically adjusts the motor power to ensure that the extension range error on both sides is <1°. If the operator releases the button, the main control board immediately cuts off the motor drive signal, the motor stops, and the extension mechanism stops. If an abnormality is detected during operation (such as a sudden current surge), a "fault shutdown" is directly triggered. Automatic mode is suitable for scenarios requiring complete extension and retraction. Its operating logic is "one-button start, automatic stop." The main control board receives the "one-button extend / retract" button signal. The button signal sends a "continuous drive" command to the two motors, which operate at a preset power. The extension mechanism continuously extends and retracts, and "synchronous control" is executed simultaneously to ensure that the cabin's level deviation is ≤1°. When the extension mechanism reaches its limit position, the motors "lock" due to mechanical limit, and the motor current rises from the rated 5A to about 15A. The motor current detection branch captures the lock current signal and feeds it back to the main control board. The main control board determines that "the preset position has been reached" and immediately outputs a stop command to cut off the motor power supply, completing the automatic shutdown. The emergency mode is suitable for emergency scenarios where the normal mode fails. The working logic is "prioritize action and simplify control". The main control board receives the "jog extension / retraction" button signal and sends a "full power drive" command to the two motors. It does not execute the "synchronous control" logic and only retains the "current abnormality emergency stop" function. Releasing the button stops the motor operation, ensuring that the operator can manually control the emergency extension and retraction of the extension mechanism.

[0046] Regardless of whether it's in normal or emergency mode, the system monitors core parameters in real time throughout the entire process. Once an anomaly is detected, protection is immediately triggered. The specific monitoring dimensions are as follows:

[0047] 1. Motor status monitoring: The motor current is collected through the current detection branch to identify faults such as "short circuit (current surge > 15A), open circuit (current is 0), stall (current continuously > 10A)" and trigger shutdown.

[0048] 2. Power status monitoring: The voltage detection module continuously collects the power supply voltage. If it exceeds the normal range (undervoltage <10.5V, overvoltage >13.5V), the motor drive will be immediately cut off and operation will be prohibited.

[0049] 3. Anti-pinch and anti-collision monitoring: If the motor current rises abnormally due to an obstacle during the operation of the extension mechanism (such as the current rising from 5A to 8A due to a pinched hand), the main control board will execute an emergency stop command within 100ms.

[0050] 4. Communication Status Monitoring: In normal mode, monitor the wireless communication between the remote control and the controller. If the communication is interrupted, immediately stop the machine and issue a prompt.

[0051] Upon detecting any fault, the system cuts off all drive signals and triggers the audible and visual alarm unit until the fault is cleared and the system is restarted. If there is no operation for an extended period of time, the child lock module will automatically lock all commands. You will need to press and hold the "unlock" button to reset before you can operate again.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vehicle-mounted control system based on a RV single-sided space extension device, characterized in that, The system includes a main controller, a remote control, external buttons, a first drive motor, a second drive motor, a power circuit, and an audible and visual alarm unit. The main controller has a built-in main control board with two motor control interfaces, a pairing button, an external button interface, and a power interface. The two motor control interfaces are connected to the first drive motor and the second drive motor, respectively. The external button interface is connected to the external button, the power interface is connected to the power circuit, and the pairing button is paired with the remote control. The audible and visual alarm unit includes a buzzer and an indicator light.

2. The vehicle-mounted control system based on a single-sided space expansion device for a motorhome according to claim 1, characterized in that, The power supply circuit includes a power supply, a reverse connection protection unit, and a two-stage DC step-down unit. The power supply is a 12V vehicle battery. The reverse connection protection unit uses a PMOS transistor design and is connected to the power input terminal to prevent reverse power supply from damaging the main control board components. The two-stage DC step-down unit includes a first-stage chip and a second-stage chip. The first stage uses an XL1509-5.0 chip to convert the 12V input voltage to 5V, and the second stage uses an AMS1117-3.3 chip to further convert the 5V voltage to 3.3V to adapt to the different voltage requirements of various functional modules of the system and provide a stable operating voltage.

3. The vehicle-mounted control system based on a single-sided space expansion device for a motorhome according to claim 1, characterized in that, The main control board uses a control chip of model GD32F103C8T6. The main control board integrates a crystal oscillator circuit, a detection circuit, and a motor drive control circuit. The crystal oscillator circuit is composed of an external passive crystal oscillator of model X32258MOB4S and a matching peripheral starting capacitor, which provides a stable clock signal for the main control board. The detection circuit includes two motor current detection branches and one power supply voltage detection branch. Each detection branch uses an LM324DT multiplex operational amplifier. When the motor current detection branch detects the motor current, it acquires the driving motor operating current signal through a sampling resistor. After being amplified by the operational amplifier, the output voltage range is limited by a clamping diode circuit, and finally input to the analog signal acquisition interface of the control chip to achieve real-time monitoring of the motor operating current. When the power supply voltage detection branch detects the power supply voltage, it divides the supply voltage through a voltage divider resistor to obtain a small-amplitude voltage signal. After being amplified by an operational amplifier and clamped, the signal is input to the control chip to achieve real-time monitoring of the supply voltage. The motor drive control circuit is adapted to a 28W brushless DC motor. It controls the motor power by adjusting the PWM duty cycle through the on / off state of the MOSFET, and controls the forward and reverse rotation of the motor by switching four relays. When the system is in full-power operation, the rated operating current of a single brushless DC motor is about 5A, and the maximum operating current can reach about 15A.

4. The vehicle-mounted control system based on a single-sided space extension device for a motorhome according to claim 1, characterized in that, The main control board also integrates a voltage detection module, which is used to continuously collect the voltage signal of the power supply circuit and monitor it in real time. When the power supply voltage exceeds the preset normal operating range, the main control board automatically outputs a stop command for the extension mechanism, prohibiting the extension operation. At the same time, it triggers the action of the sound and light alarm unit, which uses a combination of buzzer sound and red indicator light to realize the abnormal state warning, so as to prevent the extension mechanism from malfunctioning or the core components from being damaged due to abnormal voltage.

5. The vehicle-mounted control system based on a single-sided space expansion device for a motorhome according to claim 1, characterized in that, The remote control has a built-in control board, which is powered by two 1.5V dry batteries. The remote control is equipped with wake-up, pairing, jog extension, jog retraction, one-key extension, one-key retraction, stop and unlock function buttons. The remote control has a built-in intelligent sleep mechanism. After stopping button operation for 10 seconds, it will automatically enter a low-power sleep state. Pressing the wake-up button will activate the device and restore normal control functions.

6. The vehicle-mounted control system based on a single-sided space extension device for a motorhome according to claim 1, characterized in that, The main controller board and the remote controller board use a WL500B RF chip to build a stable wireless communication link, supporting an effective communication distance of up to about 8 meters. The remote controller board can transmit and execute control commands only after it has completed pairing and authentication with the main controller board.

7. The vehicle-mounted control system based on a single-sided space expansion device for a motorhome according to claim 1, characterized in that, The system has three operating modes: manual mode, automatic mode, and emergency mode. Manual mode is activated by pressing and holding the external button or the jog button on the remote control. The system stops immediately when the button is released, enabling precise and controllable step-by-step operation. In automatic mode, the extension mechanism will automatically operate by pressing the one-button extension or retraction command button. When the extension mechanism reaches the preset position, it will be stopped by detecting the motor stall current. The emergency mode can be activated by pressing the configuration button 5 times consecutively. When activated, the buzzer will prompt the operator at the set frequency. This mode uses a momentary control method and does not execute the synchronous command of the two motors. The motors run at full power output, which is suitable for emergency operation needs in special scenarios.

8. The vehicle-mounted control system based on a single-sided space extension device for a motorhome according to claim 1, characterized in that, It also includes a safety protection system, which comprises a motor status monitoring module, a power protection module, an intelligent anti-pinch and anti-collision control module, and a child lock module. The motor status monitoring module collects motor current and communication signals, identifies short circuits, open circuits, and communication interruption faults, and triggers shutdown protection upon detection of abnormalities. The power protection module monitors the power supply circuit voltage, presets overvoltage and undervoltage thresholds, and cuts off the drive power to the expansion mechanism when the voltage exceeds the normal range. Simultaneously, it links with the main control system to prohibit the output of operation commands, preventing abnormal voltage from impacting the main control chip and core sensor components, and ensuring the stability of the circuit system. The intelligent anti-pinch and anti-collision control module samples and monitors the current along the operating path of the expansion mechanism. In case of abnormalities, it immediately executes an emergency stop command, effectively avoiding collision damage or personnel pinching risks, and improving personal and equipment safety during operation. The child lock module automatically activates the child lock function when the expansion mechanism has not been operated for a long time, locking all operation commands.

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