Anti-interference motorcycle instrument circuit

Abstract

The utility model provides an anti-interference motorcycle instrument circuit, and the connection mode of the circuit is that a PS1 pin of an MCU circuit is connected with a vehicle speed sampling current signal processing circuit, and the vehicle speed sampling current signal processing circuit is provided with at least one resistor which is connected with the PS1 pin of the MCU circuit; an OILOUT pin of the MCU circuit is connected with an engine oil alarm indicating lamp circuit, and at least one capacitor is arranged in the engine oil alarm indicating lamp circuit and is connected with the OILOUT pin of the MCU circuit; a PS3 pin of the MCU circuit is connected with the vehicle speed sampling voltage signal processing circuit, and the circuit provided by the utility model eliminates link noise in a vehicle speed signal generation process, improves the anti-interference performance of the circuit, and has good expansibility.

Description

Technical Field

[0001] This invention relates to the field of instrument circuits, and more particularly to an anti-interference motorcycle instrument circuit. Background Technology

[0002] With the digital development of motorcycle instrument technology, traditional mechanical instruments are gradually being replaced by integrated and intelligent electronic instruments. Existing technologies, such as patent CN221114223U, propose a motorcycle instrument solution based on a central processing unit. This solution uses a speed sensor to detect vehicle speed in real time and control the color changes of LED lights to intuitively remind the driver of the speed range. While this solution improves driving safety and enriches instrument functions to some extent, its design still has significant limitations.

[0003] First, the existing signal processing modules are relatively basic and lack specific optimization for vehicle speed signals (such as current and voltage signals). Their circuit designs lack consideration for critical aspects such as noise suppression and signal separation, potentially leading to signal interference or insufficient acquisition accuracy, thus affecting system reliability. For example, the absence of a composite circuit structure combining operational amplifiers and filter capacitors makes it difficult to effectively eliminate environmental noise interference with vehicle speed signals.

[0004] Secondly, the integration of functional modules is low, and the coordination between the core processing circuit and peripheral functions (such as oil pressure alarm and voltage detection) is insufficient. Although the existing solution achieves the function of LED lights changing with vehicle speed, it has not been extended to driver assistance scenarios such as oil pressure monitoring and voltage abnormality alarm, thus limiting the multifunctionality of the instrument system. In addition, its circuit design lacks a modular design concept, making it difficult to be compatible with subsequent functional upgrades. Utility Model Content

[0005] The purpose of this utility model is to eliminate noise in the process of generating vehicle speed signals and improve the anti-interference capability of the motorcycle instrument involved in this embodiment.

[0006] Another objective of this invention is to improve the expandability of the MCU circuit in a motorcycle instrument panel through modular circuit design.

[0007] To achieve the above objectives, this utility model provides an anti-interference motorcycle instrument circuit. The circuit connection method includes: the PS1 pin of the MCU circuit is connected to the vehicle speed current signal processing circuit, and at least one resistor in the vehicle speed current signal processing circuit is connected to the PS1 pin of the MCU circuit; the OIL_OUT pin of the MCU circuit is connected to the oil warning indicator circuit, and at least one capacitor in the oil warning indicator circuit is connected to the OIL_OUT pin of the MCU circuit; the PS3 pin of the MCU circuit is connected to the vehicle speed voltage signal processing circuit.

[0008] Furthermore, the connection method of the vehicle speed current signal processing circuit includes: the first end of resistor 6R11 and capacitor 6C10 is connected to the PS1 pin of the MCU circuit; the second end of resistor 6R11 is connected to pin 1 of operational amplifier U2A; and the second end of capacitor 6C4 and the first end of resistor 6R7 are connected to pin 3 of the operational amplifier.

[0009] Furthermore, the connection method of the vehicle speed current signal processing circuit includes: the current inflow terminal of diode 6D1 is connected to the first terminal of capacitor 6C3 and the second terminal of resistor 6R7; the first terminal of resistor 6R9 and capacitor 6C1 is connected to the current outflow terminal of diode 6D1; the second terminals of capacitor 6C3, capacitor 6C1 and resistor 6R9 are all grounded.

[0010] Furthermore, the connection method of the vehicle speed sampling voltage signal processing circuit includes: the first end of resistor 7R4 and capacitor 7C11 is connected to the PS3 pin of the MCU circuit; the third pin of transistor 7Q1 and the second end of capacitor 7C5 are connected to the second end of capacitor 7C11; the second pin of transistor 7Q1 is connected to the second end of resistor 7R4.

[0011] Furthermore, the connection method of the vehicle speed sampling voltage signal processing circuit includes: pin 1 of the transistor 7Q1 is connected to the first end of the resistor 7R1; the second end of the resistor 7R1 is connected to the first end of the capacitor 7C5.

[0012] Furthermore, the connection method of the vehicle speed sampling voltage signal processing circuit includes: pin 1 of the transistor 7Q1 is connected to the second end of the resistor 7R2.

[0013] Furthermore, the connection method of the oil pressure alarm indicator circuit includes: the second end of resistor 5R28 is connected to the OIL_OUT pin of the MCU circuit; the second end of resistor 5R29 and the first end of resistor 5R28 are connected to pin 1 of transistor 5Q6.

[0014] Furthermore, the connection method of the oil pressure alarm indicator circuit includes: the first end of capacitor 5C10, light-emitting diode 5L18 and resistor 5R27 are connected to pin 2 of transistor 5Q6.

[0015] Furthermore, the connection method of the oil pressure alarm indicator circuit includes: pin 3 of the transistor 5Q6 is grounded, and pin 3 of the transistor 5Q6 is connected to the first end of the resistor 5R29.

[0016] Furthermore, the connection method of the oil pressure alarm indicator circuit includes: the first end of the resistor 5R28 is connected to the second end of the capacitor 5C13; the first end of the capacitor 5C13 is connected to the first end of the resistor 5R29.

[0017] The beneficial effects of this invention are that by optimizing the specific connection method of the motorcycle instrument circuit, the signal processing capability and system stability are significantly improved. For example, the claims specify that the vehicle speed current signal processing circuit includes a combination design of resistors, operational amplifiers, and filter capacitors, which can effectively filter out noise and improve signal accuracy; at the same time, the introduction of transistors and resistor networks in the vehicle speed voltage signal processing circuit enhances the dynamic response capability to voltage signals. In addition, the oil warning indicator circuit achieves stable driving of the alarm signal through the coordinated control of capacitors and transistors, avoiding false triggering. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of an MCU.

[0019] Figure 2 This is a circuit diagram for an oil pressure alarm indicator light.

[0020] Figure 3 This is a circuit diagram for processing current signals for vehicle speed measurement.

[0021] Figure 4 This is a circuit diagram for processing voltage signals for vehicle speed measurement. Detailed Implementation

[0022] It should be noted that if a circuit element has only two ports in the diagram, the upper port is designated as the first port and the lower port as the second port; if a circuit element has only two ports in the diagram, the right port is designated as the first port and the left port as the second port.

[0023] Example 1: This example discloses a circuit ground connection method related to this utility model. See details below. Figures 1 to 4 .

[0024] In this embodiment, the connection method of the motorcycle instrument circuit is as follows.

[0025] The PS1 pin of the MCU circuit is connected to the vehicle speed current signal processing circuit, and the PS1 pin of the MCU circuit is connected to the first end of resistor 6R11 and capacitor 6C10 in the vehicle speed current signal processing circuit.

[0026] In this embodiment, the connection method of the vehicle speed current signal processing circuit is as follows.

[0027] The second terminal of resistor 6R11 is connected to the second terminal of resistor 6R6. The first terminal of resistor 6R6 is connected to a 5V operating voltage. The second terminal of resistor 6R11 is also connected to pin 1 of operational amplifier U2A. Pin 4 of operational amplifier U2A, the first terminal of resistor 6R10, and the second terminal of capacitor 6C10 are all grounded. Furthermore, pin 4 of operational amplifier U2A, the first terminal of resistor 6R10, and the second terminal of capacitor 6C10 are connected together.

[0028] Pin 2 of operational amplifier U2A is connected to the first end of resistor 6R8 and the second end of resistor 6R10. The second end of resistor 6R8 is connected to a 5V operating voltage.

[0029] The 8th pin of the operational amplifier is connected to the first end of capacitor 6C5, and the first end of capacitor 6C5 and the 8th pin of the operational amplifier are connected to a 5V operating voltage.

[0030] The operational amplifier's pin 3 is connected to the first terminal of resistor 6R7 and the second terminal of capacitor 6C4. The first terminal of capacitor 6C4 is connected to the second terminal of capacitor 6C5 and both are grounded.

[0031] The second terminal of resistor 6R13, the first terminal of capacitor 6C3, and the current-in terminal of diode 6D1 are connected to the second terminal of resistor 6R7. The second terminals of capacitor 6C3, capacitor 6C1, and resistor 6R9 are connected and all grounded. The first terminals of resistor 6R9 and capacitor 6C1 are connected to the current-out terminal of diode 6D1, and the first terminals of resistor 6R9, ​​capacitor 6C1, and diode 6D1 are connected to interface SPEED2.

[0032] The PS3 pin of the MCU circuit is connected to the vehicle speed voltage signal processing circuit, and the PS3 pin of the MCU circuit is connected to the first end of resistor 7R4 and the first end of capacitor 7C11 in the vehicle speed voltage signal processing circuit.

[0033] In this embodiment, the connection method of the vehicle speed voltage signal processing circuit is as follows.

[0034] The second terminal of resistor 7R3, the second terminal of diode 7D4, the second terminal of capacitor 7C5, and pin 3 of transistor 7Q1 are connected to the second terminal of capacitor 7C11.

[0035] The second terminal of resistor 7R4 is connected to the second terminal of resistor 7R2 and pin 2 of transistor 7Q1. The first terminal of resistor 7R2 is connected to a 5V operating voltage.

[0036] Pin 1 of transistor 7Q1 is connected to the first terminal of resistor 7R1. The first terminal of resistor 7R3, the current-carrying terminal of diode 7D4, and the first terminal of capacitor 7C5 are all connected to the second terminal of resistor 7R1. Resistor 7R3, diode 7D4, and capacitor 7C5 are connected in parallel between the first terminal of resistor 7R1 and pin 3 of transistor 7Q1.

[0037] The first terminal of resistor 7R3, the current output terminal of diode 7D4, the first terminal of capacitor 7C5, and the second terminal of resistor 7R1 are connected to the second terminal of resistor 7R9. The first terminal of resistor 7R9 is connected to the current output terminal of diode 7D3 and the second terminal of resistor 7R5. The first terminal of resistor 7R5 is connected to a 5V operating voltage, and the current input terminal of diode 7D3 is connected to the power supply REV.

[0038] The OIL_OUT pin of the MCU circuit is connected to the oil pressure alarm indicator circuit, and the OIL_OUT pin of the MCU circuit is connected to the second end of the resistor 5R28 in the oil pressure alarm indicator circuit.

[0039] The connection method for the oil pressure alarm indicator circuit is as follows.

[0040] The second terminal of capacitor 5C13, the second terminal of resistor 5R29, and pin 1 of transistor 5Q6 are connected to the first terminal of resistor 5R28. The first terminal of capacitor 5C13, the first terminal of resistor 5R29, and pin 3 of transistor 5Q6 are connected and all grounded. The first terminal of resistor 5R27, the current output terminal of LED 5L18, the current input terminal of diode 5D8, and the first terminal of capacitor 5C10 are connected and all connected to pin 2 of transistor 5Q6. The second terminal of resistor 5R27, the current input terminal of LED 5L18, and the second terminal of capacitor 5C10 are connected and all connected to the first terminals of resistors 5R27 and 5R026. The second terminal of resistor 5R27, the current input terminal of LED 5L18, and the second terminal of capacitor 5C10 are all connected to the first terminal of resistor 5R30.

[0041] The second terminal of resistor 5R30 is connected to a 5V operating voltage, and the current outlet of diode 5D8 is connected to an oil pressure signal.

[0042] Resistor 5R27, LED 5L18 and capacitor 5C10 are connected in parallel between the first terminal of resistor 5R30 and the first terminal of 5R26, or in parallel between the first terminal of resistor 5R30 and the first terminal of 5R26.

[0043] Example 2: This example discloses the working process of the circuit involved in this example based on Example 1.

[0044] When the raw current signal output from the vehicle speed sensor is input through the PS1 pin of the MCU circuit, it first enters a first-order RC filter network consisting of resistor 6R11 and capacitor 6C10. Resistor 6R11 and capacitor 6C10 are connected in parallel to filter out high-frequency noise and stabilize the input signal. Simultaneously, resistor 6R6 provides a bias voltage to the signal through a 5V power supply, ensuring that the signal level is within the effective input range of operational amplifier U2A.

[0045] Operational amplifier U2A is configured in differential mode in this circuit. Pin 1 receives the filtered signal from resistor 6R11, and pin 3 is grounded through a low-pass filter network consisting of resistor 6R7 and capacitor 6C4, further suppressing high-frequency interference. Pin 2 of operational amplifier U2A forms a feedback loop with resistors 6R8 and 6R10 to adjust the amplification factor to meet the requirements of subsequent circuits. Pin 8 is connected to the 5V power supply through capacitor 6C5, providing a stable power supply to the operational amplifier and eliminating the effects of power fluctuations.

[0046] The amplified signal is output from pin 1 of operational amplifier U2A and transmitted via resistor 6R7 to a rectifier-filter network consisting of diode 6D1, capacitors 6C3 and 6C1, and resistor 6R9. Diode 6D1 conducts the signal unidirectionally, eliminating negative interference; capacitors 6C3 and 6C1 are connected in parallel to form a secondary filter, which, together with resistor 6R9, ​​forms an RC charging-discharging circuit, further smoothing the signal waveform. Finally, the processed vehicle speed current signal is output to the MCU or other functional modules through interface SPEED2, completing the accurate acquisition and conditioning of the vehicle speed signal.

[0047] When the raw voltage signal output from the vehicle speed sensor is input through the PS3 pin of the MCU circuit, it first enters the pre-filter network composed of resistor 7R4 and capacitor 7C11. Resistor 7R4 acts as a signal current limiting element, limiting sudden changes in input current, while capacitor 7C11 and 7R4 form a first-order RC low-pass filter structure, which initially filters out high-frequency noise (such as electromagnetic interference or switching noise) to ensure the stability of the input signal. At this time, the second terminal of capacitor 7C11 is connected to resistor 7R3, diode 7D4, capacitor 7C5, and pin 3 of transistor 7Q1, forming a signal shunting and protection path.

[0048] In this circuit, transistor 7Q1 serves as a key unit for processing voltage signals. Its base (pin 2) is connected to a 5V power supply through a voltage divider network of resistors 7R4 and 7R2. Resistor 7R2 provides a bias voltage to the base, ensuring the transistor operates in the amplification region. When the input voltage signal enters the collector (pin 3) of transistor 7Q1 after being filtered from pin PS3, its emitter (pin 1) is grounded through resistor 7R1, forming a common-collector amplifier circuit (emitter follower). This structure is characterized by high input impedance and low output impedance, effectively isolating the preceding filter circuit from the subsequent load and preventing signal attenuation. Simultaneously, the signal output from the emitter is fed back to the base through resistor 7R1, further stabilizing the operating point and suppressing the impact of temperature drift on amplification performance.

[0049] In the emitter circuit, resistor 7R3, diode 7D4 and capacitor 7C5 are connected in parallel between the collector and emitter of transistor 7Q1, forming a multi-layered protection and dynamic adjustment mechanism.

[0050] When current flows through diode 7D4, its cathode (current outflow terminal) is connected to the emitter, and its anode (current inflow terminal) is connected to the collector. When the input signal causes the collector voltage to be higher than the emitter voltage due to transient voltage (such as a surge), diode 7D4 is reverse-biased, protecting the transistor from reverse breakdown. Conversely, when the emitter voltage rises abnormally, the diode conducts in the forward direction, forming a current discharge path and limiting voltage spikes. Capacitor 7C5 is connected in parallel with the diode to absorb high-frequency noise and smooth voltage fluctuations during transistor switching, improving signal purity. Resistor 7R3 acts as a current-limiting resistor, working in conjunction with the diode and capacitor to prevent overcurrent damage to sensitive components.

[0051] The signal, amplified by transistor 7Q1, is output from the emitter and transmitted through resistor 7R1 to the subsequent conditioning circuit, which consists of resistor 7R9, diode 7D3, and resistor 7R5. Resistor 7R9 acts as a load resistor, converting the current signal into a voltage signal and matching the impedance of the subsequent circuit to ensure signal transmission efficiency. The anode (current inflow terminal) of diode 7D3 is connected to the power supply REV, and the cathode (current outflow terminal) is connected in series with resistor 7R5 to the 5V power supply. This design achieves the following functions: Power isolation: Diode 7D3 prevents the voltage from REV from flowing back into the signal conditioning circuit, avoiding interference with the core signal path; Level boosting: Resistor 7R5 and the 5V power supply form a voltage divider network to boost the output signal to a reference voltage, ensuring the signal level matches the MCU's input range (e.g., 0-5V); Synergistic effect of capacitor 7C5: It, along with resistors 7R1 and 7R9, forms an RC filter network to further filter out residual high-frequency noise, ensuring the smoothness of the output signal.

[0052] The MCU (taking PIC16F877 as an example) acts as the "brain" of the system. It digitally samples the pre-processed vehicle speed current and voltage signals via a built-in AD converter and, combined with the time reference provided by Timer 4, calculates vehicle speed and mileage in real time. For the vehicle speed signal, the MCU employs a redundancy check mechanism: the current and voltage signals are fused using a Kalman filter algorithm to eliminate the drift or failure risks that may exist with a single sensor, ensuring data reliability. The calculated vehicle speed value is divided into preset ranges (e.g., 0-60km / h, 60-100km / h, and above 100km / h) to control the color switching (green, yellow, red) of the LED light module.

[0053] The processing of the oil pressure signal focuses on threshold judgment. The MCU compares the real-time oil pressure value with a preset safety range (e.g., 0.1-0.5MPa). If the oil pressure is lower than the lower limit or higher than the upper limit, the alarm logic is immediately triggered: a high-level signal is sent to the oil pressure alarm indicator circuit through the OIL_OUT pin, driving transistor 5Q6 to conduct, illuminating LED 5L18, and accompanied by a buzzer. In addition, the MCU integrates power supply voltage monitoring data from voltage sensor 7. If an abnormal battery voltage is detected (e.g., below 11V or above 15V), the voltage alarm icon on the instrument panel is activated simultaneously, achieving multi-dimensional safety monitoring.

[0054] The MCU's decision-making results drive peripheral devices through various output interfaces. Color commands corresponding to vehicle speed ranges are generated by the PWM module, controlling the RGB light source of the LED lighting module: green LEDs are fully lit at low speeds, yellow LEDs gradually brighten at medium speeds, and red LEDs flash at high frequency when speeding, enhancing visual warning effects. Mileage data is transmitted to a static eight-segment display via the SPI communication protocol, displaying total mileage and single trip information in real time in digital form.

[0055] The oil pressure alarm indicator module emphasizes response speed and reliability. When the MCU issues an alarm signal, transistor 5Q6 quickly saturates and conducts, current flowing through LED 5L18 and current-limiting resistor 5R27, causing it to flash brightly. Simultaneously, capacitor 5C10 generates pulse signals through charge-discharge cycles, driving the buzzer to emit intermittent sounds, creating a dual audible and visual warning. During this process, the delay circuit composed of capacitor 5C13 and resistor 5R29 prevents false alarms caused by short-term pressure fluctuations, improving system fault tolerance.

[0056] To address electromagnetic interference and mechanical vibration under the complex operating conditions of motorcycles, each module incorporates multiple anti-interference measures. In the vehicle speed signal processing circuit, the differential input structure of operational amplifier U2A effectively suppresses common-mode noise, and the low output impedance of transistor 7Q1 emitter follower reduces signal transmission loss. The oil alarm module uses capacitors 5C10 and 5C13 to filter power supply ripple, and diode 5D18 to prevent reverse current surges. Internally, the MCU employs a watchdog timer and software error correction mechanism to periodically reset the external circuit states, preventing program crashes or freezes.

[0057] In terms of power management, the system uses an independent LDO regulator chip to power the MCU and sensors, reducing the impact of main power supply fluctuations. The 7D3 diode in the vehicle speed voltage signal processing module isolates the REV and 5V power supplies, preventing reverse current interference to the core circuitry. All signal lines use shielded cables, and TVS diodes are added to critical nodes (such as MCU pins) to protect against electrostatic discharge (ESD) and surge impacts.

[0058] The modular design of this circuit provides ample room for functional expansion. For example, a temperature sensor can be added via the I2C interface to monitor engine temperature in real time and integrate it into the instrument display; a CAN bus interface can be added to communicate with other vehicle ECUs (such as the ABS controller) for collaborative control. The MCU's spare I / O pins support user-defined functions, such as Bluetooth module connection for smartphone screen mirroring or navigation synchronization. For different models of vehicle speed sensors, only the resistance values ​​of resistors 7R4 and 6R11 or the capacitance values ​​of capacitors 7C11 and 6C10 need to be adjusted to adapt their output characteristics, without requiring a complete redesign of the core circuit.

[0059] This utility model illustrates its purpose, technical solution, and beneficial effects through specific embodiments. However, these embodiments are merely examples to demonstrate the application of the invention and do not constitute a limitation on the scope of protection of this utility model. We explicitly state that any reasonable modifications, equivalent substitutions, or technical improvements guided by the spirit and principles of this utility model should be included within its scope of protection. This means that as long as these changes do not deviate from the core idea and basic function of the invention, they should be protected by patent rights. The scope of protection of this utility model should be broad, including all directly obvious variations as well as non-obvious innovations that a technical expert can reasonably deduce from the disclosure of this utility model. This broad protection aims to promote further research and development based on this utility model, while ensuring that its innovativeness and practicality receive comprehensive legal protection.

Claims

1. An anti-interference motorcycle instrument circuit, characterized in that, The connection mode of the circuit comprises: The PS1 pin of the MCU circuit is connected with the vehicle speed acquisition current signal processing circuit, and at least one resistor in the vehicle speed acquisition current signal processing circuit is connected with the PS1 pin of the MCU circuit; The OIL_OUT pin of the MCU circuit is connected with the oil pressure alarm indicator lamp circuit, and at least one capacitor in the oil pressure alarm indicator lamp circuit is connected with the OIL_OUT pin of the MCU circuit; The PS3 pin of the MCU circuit is connected with the vehicle speed acquisition voltage signal processing circuit.

2. An anti-interference motorcycle instrument circuit according to claim 1, characterized in that, The connection mode of the vehicle speed acquisition current signal processing circuit comprises: The first end of the resistor 6R11 and the capacitor 6C10 is connected with the PS1 pin of the MCU circuit; the second end of the resistor 6R11 is connected with the 1 pin of the operational amplifier U2A; the second end of the capacitor 6C4 and the first end of the resistor 6R7 are connected with the 3 pin of the operational amplifier.

3. An anti-tamper motorcycle instrument circuit according to claim 2, characterised in that, The connection mode of the vehicle speed acquisition current signal processing circuit comprises: The current inflow end of the diode 6D1, the first end of the capacitor 6C3 and the second end of the resistor 6R7 are connected; the first end of the resistor 6R9 and the capacitor 6C1 is connected with the current outflow end of the diode 6D1; the second end of the capacitor 6C3, the capacitor 6C1 and the resistor 6R9 are grounded.

4. An anti-tamper motorcycle instrument circuit according to claim 1, characterised in that, The connection mode of the vehicle speed acquisition voltage signal processing circuit comprises: The first end of the resistor 7R4 and the capacitor 7C11 is connected with the PS3 pin of the MCU circuit; the 3 pin of the triode 7Q1 and the second end of the capacitor 7C5 are connected with the second end of the capacitor 7C11; the 2 pin of the triode 7Q1 is connected with the second end of the resistor 7R4.

5. An anti-tamper motorcycle instrument circuit according to claim 4, characterised in that, The connection mode of the vehicle speed acquisition voltage signal processing circuit comprises: The 1 pin of the triode 7Q1 is connected with the first end of the resistor 7R1; the second end of the resistor 7R1 is connected with the first end of the capacitor 7C5.

6. An anti-tamper motorcycle instrument circuit according to claim 4, wherein, The connection mode of the vehicle speed acquisition voltage signal processing circuit comprises: The 1 pin of the triode 7Q1 is connected with the second end of the resistor 7R2.

7. An anti-interference motorcycle instrument circuit according to any one of claims 1 to 6, characterized in that, The connection mode of the oil pressure alarm indicator lamp circuit comprises: The second end of the resistor 5R28 is connected with the OIL_OUT pin of the MCU circuit; the second end of the resistor 5R29 and the first end of the resistor 5R28 are connected with the 1 pin of the triode 5Q6.

8. An anti-tamper motorcycle instrument circuit according to claim 7, characterised in that, The connection mode of the oil pressure alarm indicator lamp circuit comprises: The first end of the capacitor 5C10, the light emitting diode 5L18 and the resistor 5R27 are connected with the 2 pin of the triode 5Q6.

9. An anti-tamper motorcycle instrument circuit according to claim 7, characterised in that, The connection mode of the oil pressure alarm indicator lamp circuit comprises: The 3 pin of the triode 5Q6 is grounded, and the 3 pin of the triode 5Q6 is connected with the first end of the resistor 5R29.

10. An anti-tamper motorcycle instrument circuit according to claim 7, characterised in that, The connection mode of the oil pressure alarm indicator lamp circuit comprises: The first end of the resistor 5R28 and the second end of the capacitor 5C13 are connected; the first end of the capacitor 5C13 is connected with the first end of the resistor 5R29.

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