Electronic tipping switch for a motorcycle

Abstract

The utility model relates to the field of motorcycle parts, concretely relates to a motorcycle electronic dump switch, including dump sensor shell, low voltage line and multichannel electric connection plug assembly, be equipped with with dump sensor shell fixed connection's switch subassembly in dump sensor shell, switch subassembly includes electronic dump sensor module, MCU control module, CAN communication module and peripheral auxiliary circuit, peripheral auxiliary circuit includes power management unit and reset circuit, multichannel electric connection plug assembly includes a pair of differential signal tab CAN L / CAN H of adopting twisted pair structure, dump angle debugging instruction tab, 12V DC power input tab VIN and ground tab GND, and the tab of multichannel electric connection plug assembly is all through low voltage line with switch subassembly electricity links, this technical scheme provides a kind of motorcycle electronic dump switch with high measurement accuracy, dynamic response is fast, and can real-time transmission motorcycle inclination angle, motorcycle dump protection angle can be dynamically adjusted according to need.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle parts, specifically to an electronic tilt switch for motorcycles. Background Technology

[0002] When a motorcycle is involved in an accident or when a rider accidentally falls over while cornering, it is dangerous if the engine controller cannot be immediately shut off, and the motorcycle engine is allowed to continue running at high speed. Motorcycle Engine Management Systems (EMS) are widely installed on motorcycles. Currently, they integrate electronic fuel injection, intelligent ignition, and multi-sensor data (tilt angle, temperature, etc.). EMS supports automatic engine shutdown protection in case of a fall. It monitors the motorcycle's posture in real time using a tilt sensor. When a fall or rollover is detected, it immediately triggers the EDU (Execution Unit) to cut off the ignition or fuel supply, forcibly shutting down the engine to prevent it from idling and causing a fire or mechanical damage. The EDU balances safety and reliability, effectively reducing the risk of secondary accidents.

[0003] Currently, tilt sensors for motorcycles that detect tipping signals are either mechanical or electronic. Mechanical tilt sensors primarily rely on a conductor or a ring sliding within the sensor to connect or disconnect two contacts, thus achieving tilt detection. However, mechanical tilt sensors are prone to wear and jamming during long-term operation and vibration, resulting in low reliability; common examples include ball-bearing tilt sensors. Electronic tilt sensors mainly include inductive and Hall effect sensors. Inductive tilt sensors detect tilt by detecting the position of a steel ball inside the sensor using two inductor coils; this method is complex and costly. Hall effect tilt sensors, on the other hand, detect tilt by detecting a magnetic pendulum using a Hall element. This contactless detection eliminates wear and jamming, but it cannot accurately determine the tilt angle. In the existing technology, Hall effect sensors are widely used, but their disadvantages are: (1) their magnets are easily demagnetized by engine heat or ambient heat sources, which limits their installation position; (2) strong magnetic fields (such as high-voltage lines, motors, horns, etc.) around the motorcycle may cause false triggering. At the same time, the residual magnetism or magnetization effect of the frame or metal modification parts may interfere with the sensor signal, and a filter circuit is required to resist electromagnetic interference; (3) long-term vibration or collision may cause the magnet or sensor position to shift, requiring frequent calibration and increasing maintenance costs; (4) insufficient dynamic response and response delay. Because Hall element signal processing relies on the filter circuit, the dynamic response time is usually 10~50ms, which cannot meet the real-time requirements of high-speed tipping (such as racing car crashes on curves). Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a motorcycle electronic tilt switch that offers high measurement accuracy, fast dynamic response, and the ability to transmit the motorcycle tilt angle in real time and dynamically adjust the motorcycle tilt protection angle.

[0005] To achieve this objective, the technical solution adopted by this utility model is: An electronic tilt switch for motorcycles includes a tilt sensor housing, a low-voltage wire, and a multi-channel electrical connector assembly. A switch assembly is housed within the tilt sensor housing and is fixedly connected to it. The switch assembly includes an electronic tilt sensor module, an MCU control module, a CAN communication module, and peripheral auxiliary circuitry. The peripheral auxiliary circuitry includes a power management unit and a reset circuit. The multi-channel electrical connector assembly includes a pair of twisted-pair differential signal contacts (CAN_L / CAN_H), a tilt angle adjustment command contact, a 12V DC power input contact (VIN), and a ground contact (GND). All contacts of the multi-channel electrical connector assembly are electrically connected to the switch assembly via the low-voltage wire. The electronic tilt sensor module is a high-precision digital triaxial accelerometer chip.

[0006] By adopting the above technical solution, a motorcycle electronic tilt switch equipped with a high-precision digital triaxial acceleration sensor chip is provided. It can realize the real-time output of the tilt angle during the motorcycle's operation and timely judgment of the risk of tipping over. It has high measurement accuracy and fast dynamic response. Furthermore, through the connection with the motorcycle's CAN bus, it can realize data interaction with the motorcycle's electronic control unit (EDU). When tipping or overturning is detected, it immediately triggers the EDU to cut off the ignition or fuel supply, forcibly shutting off the engine to avoid the engine running idle and causing fire or mechanical damage.

[0007] Furthermore, the electronic tilt sensor module is a high-precision digital triaxial accelerometer chip SC7A20H.

[0008] By adopting the above technical solution, the sensor can measure the triaxial acceleration data of the motorcycle with high precision and wide range, and output a low-noise, high-precision digital acceleration signal. This is more conducive to outputting high-precision real-time attitude signals of the motorcycle to the MCU control module. At the same time, it can make a faster dynamic response to the real-time changes in the motorcycle's attitude, and better meet the real-time requirements for handling tipping and racing car crashes when the motorcycle is traveling at high speed.

[0009] Further specified, the multi-channel electrical connection plug assembly has a TVS diode connected in parallel between VIN and GND, and a resettable fuse connected in series. An external 12V DC power supply is input through the external power input interface formed by VIN and GND of the multi-channel electrical connection plug assembly, passes through the fuse and TVS diode in sequence, and is then connected to the power management unit of the switching assembly via a low-voltage line. The power management unit includes an MCU control module that shares an LDO regulator with the electronic tilt sensor module and the CAN communication module via GPIO pins. The external 12V DC power supply is connected to the VIN pin of the LDO regulator, and the LDO regulator output is VOUT. The power supply pins VDD_SENSOR of the electronic tilt sensor module, VDD_MCU of the MCU control module, and VDD_CAN of the CAN communication module are connected in a star topology. Decoupling capacitors are placed close to ground between the power supply pins of the electronic tilt sensor module, the MCU control module, and the CAN communication module. An input filter capacitor is connected in parallel between VIN and GND of the LDO regulator. The ground pins GND_SENSOR, GND_MCU, and GND_CAN of the electronic tilt sensor module, the MCU control module, and the CAN communication module are all connected to the system common ground plane through independent traces. The common ground plane and the grounding plate GND of the multi-channel electrical connection plug assembly 3 are connected in a single-point star ground.

[0010] By adopting the above technical solutions, the design solves the problems of power integrity and EMC compatibility of motorcycle electronic tilt switches under complex working conditions through hierarchical input protection, low-noise power distribution, clean ground circuit, and high-reliability voltage regulation. It significantly improves the robustness of motorcycle electronic tilt switches in harsh environments such as motorcycle vibration, humidity and heat, and power surges, while reducing maintenance costs and failure rates.

[0011] Further defined, the reset circuit includes a reset voltage monitoring chip. The power supply pin VCC of the reset voltage monitoring chip is connected to the 3.3V output terminal VOUT of the LDO regulator. The ground pin GND of the reset voltage monitoring chip is connected to the system common ground. The reset signal output pin RESET of the reset voltage monitoring chip is connected in series with a DC low-impedance ferrite bead and then connected to the reset input pin NRST of the MCU control module, and in parallel to the reset pins of the electronic tilt sensor and the CAN communication module. At the same time, a pull-up resistor is connected in parallel to the output terminal VOUT of the LDO regulator.

[0012] By adopting the above technical solution, logic errors in the MCU control module caused by power fluctuations are effectively avoided, ensuring that the system can still be stably reset under transient interference and ignition surges in the motorcycle power supply, thus improving the reliability of the tilt protection function. Furthermore, the reset circuit solves the pain points of traditional motorcycle reset circuits being prone to false triggering and chaotic reset timing under complex working conditions through precise power monitoring, hierarchical anti-interference design, and multi-module collaboration. It provides a highly reliable and low-cost reset solution for motorcycle electronic tilt switches, significantly improving the overall performance of the motorcycle safety protection system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is the front view of the motorcycle's electronic tilt switch; Figure 2 This is a schematic diagram of a multi-channel electrical connection plug assembly; Figure 3 This is a functional structure diagram of a motorcycle electronic tilt switch; Figure 4 This is a pinout diagram of the SC7A20H sensor chip; Figure 5 This is an internal block diagram of the SC7A20H sensor chip.

[0015] Legend: 1. Tilting sensor housing; 2. Low-voltage wire; 3. Multi-channel electrical connection plug assembly. Detailed Implementation

[0016] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can still modify the technical solutions described in these embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0017] like Figure 1 — Figure 5The motorcycle electronic tilt switch shown includes a tilt sensor housing 1, a low-voltage wire 2, and a multi-channel electrical connector assembly 3. A switch assembly is housed inside the tilt sensor housing 1 and is fixedly connected to it. The switch assembly includes an electronic tilt sensor module, an MCU control module, a CAN communication module, and peripheral auxiliary circuitry. The peripheral auxiliary circuitry includes a power management unit and a reset circuit. The multi-channel electrical connector assembly 3 includes a pair of twisted-pair differential signal contacts CAN_L / CAN_H, a tilt angle adjustment command contact, a 12V DC power input contact VIN, and a ground contact GND. All contacts of the multi-channel electrical connector assembly 3 are electrically connected to the switch assembly via the low-voltage wire 2. The electronic tilt sensor module is a high-precision digital triaxial accelerometer chip SC7A20H.

[0018] In the switching assembly, the electronic tilt sensor module SC7A20H is connected to the MCU control module via an I²C / SPI digital interface, outputting triaxial acceleration and tilt angle data in real time. The MCU control module receives the raw attitude signal from the electronic tilt sensor module SC7A20H, performs filtering algorithms and dynamic threshold judgment, and generates calibrated attitude parameters. The MCU control module is connected to the CAN communication module via an SPI interface, and the CAN communication module transmits the processed signals of the MCU control module to the outside via CAN_H / CAN_L differential signal lines.

[0019] The switch assembly is connected to the motorcycle CAN bus network via the low-voltage line 2 and the plug-in connector 3, and then interacts with the motorcycle electronic control unit (EDU) via the motorcycle CAN bus network.

[0020] In the switching assembly, the MCU control module is connected to relevant peripheral auxiliary circuits, including a power management unit and a reset circuit: 1) Power Management Unit: The multi-channel electrical connector assembly 3 has a TVS diode connected in parallel between VIN and GND, and a self-resetting fuse connected in series. An external 12V DC power supply is input through the external power input interface formed by VIN and GND of the multi-channel electrical connector assembly 3, and then passes through the fuse and TVS diode in sequence, before being connected to the power management unit of the switching assembly through the low-voltage line 2. The power management unit includes an MCU control module that shares an LDO regulator with the electronic tilt sensor module and the CAN communication module through GPIO pins. The external 12V DC power supply is connected to the VIN pin of the LDO regulator, and the LDO regulator output is VOUT. The power supply pins VDD_SENSOR of the electronic tilt sensor module, VDD_MCU of the MCU control module, and VDD_CAN of the CAN communication module are connected in a star topology. Decoupling capacitors are placed near ground on the power supply pins of the electronic tilt sensor module, MCU control module, and CAN communication module. An input filter capacitor is connected in parallel between VIN and GND of the LDO regulator. The ground pins GND_SENSOR, GND_MCU, and GND_CAN of the electronic tilt sensor module, MCU control module, and CAN communication module are all connected to the system common ground plane via independent traces. The common ground plane and the grounding plate GND of the multi-channel electrical connection plug assembly 3 are connected using a single-point star ground. 2) Reset circuit: Includes a reset voltage monitoring chip. The power supply pin VCC of the reset voltage monitoring chip is connected to the 3.3V output terminal VOUT of the LDO regulator. The ground pin GND of the reset voltage monitoring chip is connected to the system common ground. The reset signal output pin RESET of the reset voltage monitoring chip... A series low-impedance DC ferrite bead is connected to the reset input pin NRST of the MCU control module, and in parallel to the reset pins of the electronic tilt sensor and the CAN communication module. At the same time, a pull-up resistor is connected in parallel to the output terminal VOUT of the LDO regulator.

[0021] In use, the operator installs the component in a designated location on the motorcycle. During operation, the switch assembly mainly undergoes the following stages: Initialization Phase: 1) Power-on reset: After the LDO output stabilizes at 3.3V, the reset voltage monitoring chip detects a voltage ≥3.0V and releases the RESET signal. The MCU control module then starts the initialization program. 2) Sensor configuration: The MCU control module sends an initialization command to the electronic tilt sensor module SC7A20H via the SPI / I²C bus, loads the preset acceleration threshold (e.g., tilt angle range of 65°±10°) and sampling frequency parameters, completes the setting of the working mode of the electronic tilt sensor module SC7A20H, and completes the initialization of the CAN communication module, configuring the CAN controller baud rate and message ID, activating the standard frame format, and ensuring data transmission compatibility with the vehicle EDU.

[0022] Real-time attitude detection stage: 1) Data acquisition: The electronic tilt sensor SC7A20H outputs triaxial acceleration at a certain frequency; 2) Signal processing: The MCU control module applies a filter to the raw attitude data transmitted by the electronic tilt sensor SC7A20H to perform low-pass filtering to suppress high-frequency vibration noise; 3) Tilt angle calculation and real-time output: The MCU control module outputs the lateral tilt angle θ in real time according to the tilt angle calculation formula; 4) Threshold judgment: If θ continuously exceeds the safety threshold (e.g., 65°±10°) for 1 second, it is judged as a tipping risk.

[0023] Emergency Control Phase: 1) Engine Shutdown Control: After the CAN communication module receives the tipping risk signal from the MCU control module, the CAN communication module sends a low level through the CAN_L differential signal line and interacts with the motorcycle electronic control unit (EDU) through the CAN bus network to cut off the power supply to the ignition relay and force the engine to shut down; 2) CAN Alarm Broadcast: Encapsulates an emergency status message, the data field of which includes tilt angle, acceleration and fault code, and notifies the ECU to activate the instrument alarm through the CAN bus.

[0024] Recovery phase; 1) Tilt release detection: When θ recovers to the safe range (θ<65°±10°), the reset pin of the MCU control module reinitializes each module according to the power-on procedure, releases the brake and restores the ignition circuit.

[0025] Threshold Adjustment: In this embodiment, the tilt protection angle of the vehicle can be dynamically adjusted as needed. Ensuring the CAN communication module's terminal resistor is matched and its baud rate is consistent with the MCU (e.g., 500kbps), a complete CAN frame containing the desired tilt protection angle information is sent to the MCU control module via the host computer software. This CAN frame, based on the ISO 11898 standard, converts the target tilt threshold (e.g., 45°) into a hexadecimal value (e.g., 0x2D), fills it into the specified position in the CAN data field according to the MCU protocol requirements, and is formed using a standard CAN frame (11-bit identifier), with the identifier matching the MCU's receive filter. After successfully receiving the instruction, the MCU returns an ACK confirmation frame via the CAN bus, with the data field containing the currently effective threshold value. Through the aforementioned operations, the tilt protection angle of the motorcycle's electronic tilt switch can be adjusted to adapt to different vehicle models, weather conditions, and road conditions, providing wider compatibility.

[0026] The SC7A20H electronic tilt sensor module is a compact, low-power, digital output, LGA-packaged, three-axis linear accelerometer. The complete circuit chip includes a mechanical sensing unit and an integrated circuit interface. The integrated circuit interface interfaces with the mechanical sensing unit, reads its sensor information, and provides it to an external MCU via an I²C / SPI interface. The mechanical sensing unit consists of a suspended mass and a silicon frame. The frame is the fixed end of the mass, and the suspended mass is fixed to the frame by anchor points. The suspended mass can move freely in three-dimensional space. When the sensor accelerates, the mass will displace relative to the fixed part, causing an imbalance in the differential capacitance. The integrated circuit interface integrates the voltage pulse applied to the differential capacitor using a charge integration circuit. The integration result measures the magnitude of the differential capacitance, which in turn measures the magnitude of the displacement, ultimately measuring the corresponding acceleration value. The SC7A20H electronic tilt sensor module incorporates a high-precision calibration module. Its circuitry includes sensitivity (So), zero-drift (TyOff) calibration compensation functions and a self-test function, enabling precise compensation for sensor offset and gain errors. It achieves a minimum resolution of 0.00098 g / LSB (±2g range), capable of detecting micro-vibrations (e.g., early warning of mechanical faults) or minute attitude changes (e.g., tilt angle adjustments in the 0.1° range). Furthermore, it boasts a wide measurement range: supporting a dynamic range from ±2g to ±16g, balancing high sensitivity with the ability to detect large impact signals. Therefore, it can achieve high-precision, wide-range measurements and output low-noise, high-precision digital acceleration signals, facilitating the output of high-precision real-time motorcycle attitude signals to the MCU control module.

[0027] The electronic tilt sensor module SC7A20H provides access to an external MCU via an I²C / SPI interface. The I²C interface supports both standard mode (100kHz) and fast mode (400kHz) I²C standards. The SPI interface has a maximum clock frequency of 10MHz and can transmit three-axis (X / Y / Z) acceleration data (6 bytes in total) every 2.5ms at a 400Hz output data rate (ODR). Furthermore, the SC7A20H features low-latency interrupt triggering. Through the INT1 / INT2 interrupt pins, the interrupt response delay is ≤1ms when free fall, single / double click, or other events are detected, ensuring rapid system response. Compared to Hall element signal processing, which relies on filtering circuits and has a dynamic response time of typically 10-50ms, the motorcycle electronic tilt switch in this embodiment can make a faster dynamic response to real-time changes in motorcycle posture, and is more suitable for the real-time requirements of handling tilting (such as racing car crashes) at high speeds.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: This invention provides an electronic tilt switch for motorcycles that features high measurement accuracy, fast dynamic response, and the ability to transmit the motorcycle tilt angle in real time and dynamically adjust the motorcycle tilt protection angle.

[0029] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described below simultaneously. Contents not described in detail in this specification are prior art known to those skilled in the art.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection. It can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motorcycle electronic tilt switch, comprising a tilt sensor housing, a low-voltage wire, and a multi-channel electrical connection plug assembly, wherein a switch assembly is disposed within the tilt sensor housing, characterized in that: The switch assembly is fixedly connected to the tilt sensor housing. The switch assembly includes an electronic tilt sensor module, an MCU control module, a CAN communication module, and peripheral auxiliary circuitry. The peripheral auxiliary circuitry includes a power management unit and a reset circuit. The multi-channel electrical connector assembly includes a pair of differential signal contacts CAN_L / CAN_H with a twisted-pair structure, a tilt angle adjustment command contact, a 12V DC power input contact VIN, and a ground contact GND. All contacts of the multi-channel electrical connector assembly are electrically connected to the switch assembly via the low-voltage wire. The electronic tilt sensor module is a high-precision digital triaxial accelerometer chip.

2. The motorcycle electronic tilt switch according to claim 1, characterized in that: The electronic tilt sensor module is a high-precision digital triaxial accelerometer chip SC7A20H.

3. The motorcycle electronic tilt switch according to claim 1, characterized in that: The multi-channel electrical connector assembly has a TVS diode connected in parallel between VIN and GND, and a resettable fuse connected in series. An external 12V DC power supply is input through the external power input interface formed by VIN and GND of the multi-channel electrical connector assembly, passing through the fuse and TVS diode, and then connected to the power management unit of the switching assembly via a low-voltage line. The power management unit includes an MCU control module that shares an LDO regulator with the electronic tilt sensor module and the CAN communication module via GPIO pins. The external 12V DC power supply is connected to the VIN pin of the LDO regulator. The output terminal VOUT of the LDO regulator is connected in a star topology to the power pins VDD_SENSOR of the electronic tilt sensor module, VDD_MCU of the MCU control module, and VDD_CAN of the CAN communication module. Decoupling capacitors are placed close to ground between the power pins of the electronic tilt sensor module, the MCU control module, and the CAN communication module. An input filter capacitor is connected in parallel between VIN and GND of the LDO regulator. The grounding pins GND_SENSOR, GND_MCU, and GND_CAN of the control module and CAN communication module are all connected to the system common ground plane through independent wiring. The common ground plane and the grounding plate GND of the multi-channel electrical connection plug assembly (3) are grounded in a single-point star configuration.

4. The motorcycle electronic tilt switch according to claim 3, characterized in that: The reset circuit includes a reset voltage monitoring chip. The power supply pin VCC of the reset voltage monitoring chip is connected to the 3.3V output terminal VOUT of the LDO regulator. The ground pin GND of the reset voltage monitoring chip is connected to the system common ground. The reset signal output pin RESET of the reset voltage monitoring chip is connected in series with a DC low-impedance ferrite bead and then connected to the reset input pin NRST of the MCU control module, and in parallel to the reset pins of the electronic tilt sensor and the CAN communication module. At the same time, a pull-up resistor is connected in parallel to the output terminal VOUT of the LDO regulator.

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