An economy vehicle suspension control hardware circuit

Abstract

The utility model relates to the technical field of automobile industry discloses an economic type vehicle suspension control hardware circuit, including power supply control unit, MCU power supply, brake signal unit, battery, be provided with TVS1 in the power supply control unit, be provided with D1, D2 in the power supply control unit, be provided with D3, D4, R1, R2, R3, C2, Q1 in the power supply control unit, the both ends of L1 are electrically connected with D5, the output side of upper circuit is provided with C5, C6, the inside electric connection of upper circuit has LED, R8, the output side of lower circuit is provided with C9, C10, the output of MCU power supply is provided with pressure sensor, height sensor, main control chip, in the utility model, through modularization design and integrated circuit, reduce hardware cost, prevent reverse connection, the system anti -jamming ability of overvoltage protection is improved significantly, ensure that system stable and reliable operation, strengthen system stability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive industry technology, and in particular to a hardware circuit for suspension control of an economy vehicle. Background Technology

[0002] With the rapid development of the automotive industry, vehicle safety, stability, and comfort are receiving increasing attention. Especially for vehicles equipped with air suspension systems, controlling vehicle posture by adjusting the internal air pressure of the airbags has become a crucial technical means. Vehicle posture management not only improves vehicle stability under different operating conditions but also dynamically adjusts according to road conditions and load changes, thereby improving vehicle handling performance and ride comfort.

[0003] Traditional suspension control circuits are redundant and costly, and they lack sufficient protection against abnormal conditions such as reverse power connection and instantaneous surge voltage, resulting in reduced system reliability. Furthermore, existing systems have limitations in the efficiency of multi-sensor signal integration and processing and real-time adjustment of airbag pressure, making it difficult to adapt to the dynamic needs of complex road conditions and load changes. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an economical vehicle suspension control hardware circuit, which aims to improve the problems of redundant and costly control circuit design, insufficient handling of abnormal operating conditions, and the upper limit of efficiency of multi-sensor and airbag pressure regulation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hardware circuit for controlling the suspension of an economical vehicle, comprising a power supply control unit, an MCU power supply, a brake signal unit, and a battery. The power supply control unit includes a TVS1, D1 and D2, D3, D4, R1, R2, R3, C2, and Q1, and a C1. The MCU power supply circuit includes a VDD, with the input of VDD electrically connected to U1. The input of VDD is electrically connected to C3 and C4. The pins of U1 are electrically connected to PO1 and L1. The two ends of L1 are electrically connected to D5. The output side of the upper circuit is provided with C5 and C6. The upper circuit is electrically connected to LED and R8. The input part of the MCU power supply lower circuit is electrically connected to U2 and L2. The VDD is electrically connected to C7 and C8. The VDD of the lower circuit is provided with PO2. R9, Q3, and R10 are provided on PO2. The two ends of L2 are provided with D6. The output side of the lower circuit is provided with C9 and C10. The output terminal of the MCU power supply is provided with a pressure sensor, a height sensor, and a main control chip.

[0006] Through the above technical solution: TVS1 suppresses surges, D1 prevents reverse connection, D2 regulates voltage, Q1 controls on / off switching, C1 filters, the upper half of the MCU power supply circuit, VDD is filtered into U1, PO1 controls, L1, D5, C5, C6 filter, LED indicator, the lower half of the circuit, PO2 controls U2 through R9, Q3, R10, L2, D6, C9, C10 ensure output, the output terminal is connected to the sensor and the main control chip.

[0007] As a further description of the above technical solution:

[0008] Preferably, the pressure sensor includes J2, J3, and J4. J2 is electrically connected to the output terminal of the MCU power supply and has three pins for grounding to form a power loop. The MCU power supply includes resistor R19, which is electrically connected to capacitor C18 for filtering and stabilizing the sensor power supply voltage. C18 is electrically connected to resistor R20, which is also connected to C19 for filtering. R20 is electrically connected to PT1-AD. J3 has three pins for grounding to form a power loop. The MCU power supply includes resistor R21, which is electrically connected to capacitor C20 for filtering and stabilizing the sensor power supply voltage. C20 is electrically connected to resistor R22, which is also connected to C21 for filtering. R22 is electrically connected to PT2-AD. J4 has three pins for grounding to form a power loop. The MCU power supply includes... R23 is electrically connected to C22 for filtering and stabilizing the sensor power supply voltage. C22 is electrically connected to R24, which in turn is connected to C23 for filtering. R24 is also electrically connected to PT3-AD. The MCU power supply includes the main control chip. The +5V power supply from the MCU is electrically connected to the main control chip pins via R12 and R11. C11, C12, and C13 are connected in parallel with the +5V power supply from the MCU for filtering. The pins of the main control chip are electrically connected to the +5V power supply from the MCU via R15. Y1 is electrically connected to the main control chip pins, which are connected to C11 and C12. C11 and C12 ensure the stability of Y1. The +5V power supply from the MCU is electrically connected to R14 and R13. D7 and C14 are electrically connected to the main control chip for filtering. The PA7 pin of the main control chip is electrically connected to SBK. EN, the PA8 pin of the main control chip is electrically connected to HT1-AD, the PA9 pin of the main control chip is electrically connected to HT2-AD, the PA10 pin of the main control chip is electrically connected to PT1-AD, the PA11 pin of the main control chip is electrically connected to PT2-AD, the PA12 pin of the main control chip is electrically connected to PT3-AD, the PB4, PB5, and PB6 pins of the main control chip are electrically connected to PO2, OF-VCC, and JK-IO respectively, and the PB9 and PB10 pins of the main control chip are electrically connected to CAN1-RX and CAN1 respectively. -TX is used for data communication. The PC9 and PC7 pins of the main control chip are electrically connected to the programming port CN1 for debugging. The main control chip has an RST pin. The programming port CN1 is electrically connected to the +5V power supply of the MCU. C17 is electrically connected to the programming port CN1 for filtering. The height sensor includes HT1-IN and HT2-IN. HT1-IN is electrically connected to resistors R41 and R42. The other end of R41 is grounded. C27 is electrically connected to R41 for filtering, and C28 is electrically connected to R42 for secondary filtering.The HT1-AD is electrically connected to one end of R42. The HT2-IN is electrically connected to R43 and R44. The other end of R43 is grounded. R43 is electrically connected to C29 for filtering. R44 is electrically connected to C30 for secondary filtering. The HT2-AD is electrically connected to one end of R44. The output of the main control chip is electrically connected to a valve coil drive circuit, a relay drive circuit, and a voltage detection circuit.

[0009] Through the above technical solution: the +5VA power supply of the MCU is electrically connected to pin 3 of U5, pin 2 of U5 is grounded, C33 is connected in parallel across the power supply for filtering, pins 4 and 1 of U5 are electrically connected to CAN1-RX and CAN1-TX respectively for data reception, pins 6 and 7 of U5 are connected to CAN1L and CAN1H respectively, pin 8 of U5 is grounded through R46, CAN1L is electrically connected to pin 2 of PDS1, CAN1L and CAN1H are connected in parallel with C31 and C32 for filtering, and R45 is electrically connected to U5 to ensure data integrity.

[0010] As a further description of the above technical solution:

[0011] Preferably, the +5VA power supply of the MCU is electrically connected to pin 3 of U5, pin 2 of U5 is grounded, C33 is connected in parallel across the power supply for filtering, pins 4 and 1 of U5 are electrically connected to CAN1-RX and CAN1-TX respectively for data reception, pins 6 and 7 of U5 are connected to CAN1L and CAN1H respectively, pin 8 of U5 is grounded through R46, CAN1L is electrically connected to pin 2 of PDS1, CAN1L and CAN1H are connected in parallel with C31 and C32 for filtering, and R45 is electrically connected to U5 to ensure data integrity.

[0012] The above technical solution uses C31, C32, C33, PDS1, U5, R45, and R46 to form a CAN communication circuit. External communication is achieved through this circuit with the MCU via the CAN line. U3 is the main control MCU. Together with the crystal oscillator circuits C11, C12, Y1, and R11, the reset circuits D7, C14, and R12, the MCU filter capacitors C13, C15, and C16, and the bias resistors R12, R14, R15, and R16, it forms a central control circuit. This circuit processes and judges the input signals and makes corresponding output control based on the MCU algorithm.

[0013] As a further description of the above technical solution:

[0014] Preferably, the brake signal unit includes SBK SIN, SBK SIN is electrically connected to R4, one end of R4 is electrically connected to one end of Q2 and R5, the other end of R5 is grounded, the +5V power supply of the MCU is electrically connected to R6, one end of R6 is electrically connected to the other end of Q2, R7, and C34, the other end of C34 is grounded, and R7 is electrically connected to SBK EN.

[0015] The above technical solution involves a brake signal unit consisting of SBK SIN, resistors R4, R5, R6, and R7, MOSFET Q2, and capacitor C34. SBK SIN is connected to the gate of Q2 via R4 and to grounded R5. +5V is connected to the drain of Q2 via R6, R7, and grounded C34. R7 is connected to the SBKEN output. The brake signal is switched by the on / off state of Q2.

[0016] As a further description of the above technical solution:

[0017] Preferably, the valve coil drive circuit includes R25, R26, Q4, D8, R27, R28, Q5, D9, R29, R30, Q6, D10, R31, R32, Q7, D11, which form 4 sets of solenoid valve coil drives for controlling the opening or closing of the solenoid valve.

[0018] The above technical solution involves a valve coil drive circuit consisting of four circuits. Each circuit comprises a +12V source, a solenoid valve coil, a diode, a MOSFET, and a resistor. The +12V source is connected to the coil and the anode of D8. The other end of the coil is connected to the drain of Q4, and the source of Q4 is grounded. The control signal JKD1 is connected to the gate of Q4 via R25. One end of R26 is connected to the gate, and the other end is grounded. D8 is connected to +12V. The remaining three circuits consist of R27, R28, Q5, and D9; R29, R30, Q6, and D10; and R31, R32, Q7, and D11, respectively. These four circuits work together to control the opening or closing of the four solenoid valves.

[0019] As a further description of the above technical solution:

[0020] Preferably, the relay drive circuit includes R33, R34, F1, Q8, C24, and D12, which are used as power switches for the external air pump to control whether it is inflated.

[0021] The above technical solution consists of resistors R33 and R34, resistor F1, MOSFET Q8, capacitor C24, and diode D12. The control signal is connected to the gate of Q8 via R33, grounded via R34, and the drain of Q8 is connected to F1. C24 and D12 are connected in parallel to control whether the air pump power switch is filled with air.

[0022] As a further description of the above technical solution:

[0023] Preferably, the voltage detection circuit includes R35, R36, R37, and C25, which together form an ignition power supply voltage divider bias circuit. The voltage detection circuit also includes R38, R39, R40, and C26, which together form a battery power supply voltage bias circuit.

[0024] The above technical solution involves a voltage detection circuit consisting of two parts: ignition power detection is input via SUP, which is divided by R35 and R36, and processed by R37 and C25 to output SUP-AD; battery power detection is input via VCC, which is divided by R38 and R39, and processed by R40 and C26 to output VCC-AD.

[0025] As a further description of the above technical solution:

[0026] Preferably, the battery includes a positive terminal, a negative terminal, and a JC interface. The positive terminal includes F2, one end of which is electrically connected to JK1 for powering the air pump M1, and the other end of which is electrically connected to J1. The negative terminal is used for grounding. Pins 8 and 9 of J1 are electrically connected to the altitude sensor, pin 10 of J1 is electrically connected to the brake sensor, and pins 6 and 7 of J1 are electrically connected to CAN communication. One end of the air pump M1 is electrically connected to JK1, and the other end is grounded. Pins A4, B9, A13, and B4 of the JC interface provide +5VA USB power. Pin 3 of J1 is electrically connected to the ignition power supply, pin 4 of J1 is connected to a relay, pins 5 and 12 of J1 are used for grounding, and multiple GND pins of the JC interface are used for grounding.

[0027] The above technical solution involves a battery consisting of positive and negative terminals and a JC interface. One end of the positive terminal F2 is connected to JK1 to power the air pump M1. The other end of M1 is grounded and connected to J1. Pins 8 and 9 of J1 are connected to the height sensor, pin 10 is connected to the brake signal input SBK SIN, pins 6 and 7 are connected to CAN communication, pin 3 is connected to the ignition power supply SUP, pin 4 is connected to the relay JK-ON, and pins 5 and 12 are grounded. Pins A4, B9, A13, and B4 of the JC interface provide +5VA power, and multiple GND pins are grounded, thus achieving power distribution and signal connection.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the hardware cost is reduced through modular design and integrated circuit, and the reverse connection protection and overvoltage protection significantly improve the system's anti-interference capability, ensuring stable and reliable system operation and enhancing system stability and reliability.

[0030] 2. In this utility model, by combining multi-sensor data fusion with MCU high-efficiency algorithms, changes in operating conditions can be quickly sensed and airbag pressure can be adjusted in a timely manner, achieving millisecond-level response of airbag pressure, improving vehicle comfort and safety, and ensuring driving safety. Attached Figure Description

[0031] Figure 1 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0032] Figure 2 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0033] Figure 3 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0034] Figure 4 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0035] Figure 5 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0036] Figure 6 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0037] Figure 7 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0038] Figure 8 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0039] Figure 9 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0040] Figure 10 The circuit diagram of an economical vehicle suspension control hardware circuit proposed in this utility model;

[0041] Figure 11 This invention provides a circuit diagram of an economical vehicle suspension control hardware circuit. Detailed Implementation

[0042] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] Reference Figure 1 , Figure 2 This utility model provides an embodiment of an economical vehicle suspension control hardware circuit, including a power supply control unit, an MCU power supply, a brake signal unit, and a battery. The power supply control unit includes a TVS1, D1, D2, D3, D4, R1, R2, R3, C2, Q1, and C1. The MCU power supply circuit includes a VDD, with its input portion electrically connected to U1. The input portions of VDD are electrically connected to C3, C4, and U1. The pins are electrically connected to PO1 and L1. D5 is electrically connected to both ends of L1. C5 and C6 are set on the output side of the upper circuit. LED and R8 are electrically connected inside the upper circuit. U2 and L2 are electrically connected to the input part of the MCU power supply lower circuit. C7 and C8 are electrically connected to VDD. PO2 is set inside VDD of the lower circuit. R9, Q3 and R10 are set on PO2. D6 is set at both ends of L2. C9 and C10 are set on the output side of the lower circuit. The pressure sensor, height sensor and main control chip are set at the output end of the MCU power supply.

[0044] Specifically, TVS1 effectively suppresses surge voltage to protect the circuit; D1 prevents reverse connection to ensure power input; D2 regulates voltage; D3, D4, R1, R2, R3, C2, and Q1 form the control circuit, controlling power supply switching through the conduction and cutoff of Q1; C1 filters; the MCU power supply is divided into upper and lower parts. In the upper part of the circuit, VDD input is filtered by C3 and C4 before being connected to U1; the output is filtered by L1 and D5, and further filtered by C5 and C6; LED, along with R8, displays the power supply status. In the lower part of the circuit, VDD is connected to C7 and C8 for filtering; PO2 controls U2's operation through R9, R10, and Q3; L2 and D6 filter; C9 and C10 further filter the output; finally, the MCU power supply output is connected to the pressure and height sensors and the main control chip.

[0045] Reference Figure 3 , Figure 5 , Figure 9The pressure sensor includes J2, J3, and J4. J2 is electrically connected to the output of the MCU power supply and has three pins for grounding to form a power loop. The MCU power supply includes resistor R19, which is electrically connected to capacitor C18 for filtering and stabilizing the sensor power supply voltage. C18 is electrically connected to resistor R20, which is also connected to C19 for filtering. R20 is also connected to PT1-AD. J3 has three pins for grounding to form a power loop. The MCU power supply includes resistor R21, which is electrically connected to capacitor C20 for filtering and stabilizing the sensor power supply voltage. C20 is electrically connected to resistor R22, which is also connected to C21 for filtering. R22 is also connected to PT2-AD. J4 has three pins for grounding to form a power loop. The MCU power supply includes resistor R23. R23 is electrically connected to C22 for filtering and stabilizing the sensor power supply voltage. C22 is electrically connected to R24, which in turn is connected to C23 for filtering. R24 is also electrically connected to PT3-AD. The MCU power supply includes the main control chip. The +5V MCU power supply is electrically connected to the main control chip pins via R12 and R11. C11, C12, and C13 are connected in parallel with the +5V MCU power supply for filtering. The main control chip pins are electrically connected to the +5V MCU power supply via R15. Y1 is electrically connected to the main control chip pins, which are connected to C11 and C12. C11 and C12 ensure the stability of Y1. The +5V MCU power supply is electrically connected to R14 and R13. The main control chip is electrically connected to D7 and C14 for filtering. The PA7 pin of the main control chip is electrically connected to SBK. The main control chip's PA8 pin is electrically connected to HT1-AD, PA9 pin is electrically connected to HT2-AD, PA10 pin is electrically connected to PT1-AD, PA11 pin is electrically connected to PT2-AD, PA12 pin is electrically connected to PT3-AD, PB4, PB5, and PB6 pins are electrically connected to PO2, OF-VCC, and JK-IO respectively, PB9 and PB10 pins are electrically connected to CAN1-RX and CAN1-TX respectively for data communication, and PC9 and PC7 pins are electrically connected to the programming port CN1 for debugging. The control chip has an RST pin. The programming port CN1 is electrically connected to the +5V power supply of the MCU. C17 is connected to programming port CN1 for filtering. The height sensor includes HT1-IN and HT2-IN. HT1-IN is connected to resistors R41 and R42. The other end of R41 is grounded. C27 is connected to R41 for filtering. C28 is connected to R42 for secondary filtering. HT1-AD is connected to one end of R42. HT2-IN is connected to resistors R43 and R44. The other end of R43 is grounded. C29 is connected to R43 for filtering. C30 is connected to R44 for secondary filtering. HT2-AD is connected to one end of R44.The output of the main control chip is electrically connected to a valve coil drive circuit, a relay drive circuit, and a voltage detection circuit.

[0046] Specifically, the pressure sensor is connected via J2, J3, and J4. Each interface is equipped with resistors R19, C18, R20, and C19 for voltage stabilization and filtering, ensuring that the signal can be input to the main control chip. The MCU power supply is connected to the main control chip via resistors R12 and R11. C11, C12, and C13 connected in parallel with the MCU are used for filtering, working with the Y1 crystal oscillator and C11 and C12 to ensure its stability. D7 and C14 further filter the signal. The HT1-IN and HT2-IN of the height sensor are filtered by resistors R41, C27, R42, and C28 to improve its reliability. The PA7 to PA12 pins of the main control chip collect brake, height, and pressure signals. PB9 and PB10 enable data communication. PC9 and PC7 are connected to CN1 of the programming port. C17 is used for filtering, and its output is connected to the valve coil, relay drive, and voltage detection circuit, enhancing the stability and reliability of signal transmission and optimizing the overall vehicle performance.

[0047] Reference Figure 10 The +5VA power supply for the MCU is connected to pin 3 of U5, pin 2 of U5 is grounded, C33 is connected in parallel across the power supply for filtering, pins 4 and 1 of U5 are connected to CAN1-RX and CAN1-TX respectively for data reception, pins 6 and 7 of U5 are connected to CAN1L and CAN1H respectively, pin 8 of U5 is grounded through R46, CAN1L is connected to pin 2 of PDS1, CAN1L and CAN1H are connected in parallel with C31 and C32 for filtering, and R45 is connected to U5 to ensure data integrity;

[0048] Specifically, the MCU's +5VA supplies power to pin 3 of U5, pin 2 is grounded, C33 is connected in parallel across the power supply for filtering, pins 4 and 1 are connected to CAN1-RX and CAN1-TX respectively to transmit and receive data, pins 6 and 7 are connected to the bus, pin 8 is grounded through R46, CAN1L is connected to pin 2 of PDS1 for electrostatic protection, C31 and C32 filter the bus, and R45 ensures complete data transmission.

[0049] Reference Figure 11 The brake signal unit includes SBK SIN, which is electrically connected to R4. One end of R4 is electrically connected to one end of Q2 and R5. The other end of R5 is grounded. The +5V power supply for the MCU is electrically connected to R6. One end of R6 is electrically connected to the other end of Q2, R7, and C34. The other end of C34 is grounded. R7 is electrically connected to SBK EN.

[0050] Specifically, SBK SIN is the input signal, which is connected to Q2 and R5 via R4. R5 ensures that Q2 is not falsely triggered. The +5V power supply of the MCU is connected to Q2, R7 and C34 via R6. C34 is grounded for filtering, and R7 acts as a current limiter to ensure stable output of SBK EN signal.

[0051] Reference Figure 6 The valve coil drive circuit includes R25, R26, Q4, D8, R27, R28, Q5, D9, R29, R30, Q6, D10, R31, R32, Q7, D11, which form 4 sets of solenoid valve coil drives to control the solenoid valve to open or close.

[0052] Specifically, the circuit consists of four sets of drive units, which work together to precisely control the opening or closing of the solenoid valve, improving the response speed and stability of the suspension control and ensuring reliable system operation.

[0053] Reference Figure 7 The relay drive circuit includes R33, R34, F1, Q8, C24, and D12, which are used as the power switch for the external air pump to control whether it is inflated.

[0054] Specifically, the JK-ON signal controls Q8 via R33, and R34 pulls down the circuit. When Q8 is on, the circuit is open. C24 filters the circuit, and D12 prevents reverse voltage. This precisely controls the power switch of the air pump, avoiding unnecessary operation of the air pump and reducing energy consumption.

[0055] Reference Figure 8 The voltage detection circuit includes R35, R36, R37, and C25. R35, R36, R37, and C25 form an ignition power supply voltage divider bias circuit. The voltage detection circuit includes R38, R39, R40, and C26. R38, R39, R40, and C26 form a battery power supply voltage bias circuit.

[0056] Specifically, the voltage detection circuit has two sets: R35, R36, R37, and C25 detect the ignition power supply, and R38, R39, R40, and C26 detect the battery power supply. They are divided and filtered respectively, and then output SUP-AD and VCC-AD signals to ensure that the voltage can be monitored in real time and to ensure the stable operation of the vehicle suspension system.

[0057] Reference Figure 4The battery includes a positive terminal, a negative terminal, and a JC interface. The positive terminal includes F2, one end of which is electrically connected to JK1 to power the air pump M1. The other end of F2 is electrically connected to J1. The negative terminal is used for grounding. Pins 8 and 9 of J1 are electrically connected to the altitude sensor, pin 10 of J1 is electrically connected to the brake sensor, and pins 6 and 7 of J1 are electrically connected to CAN communication. One end of the air pump M1 is electrically connected to JK1, and the other end is grounded. Pins A4, B9, A13, and B4 of the JC interface provide +5VA USB power. Pin 3 of J1 is electrically connected to the ignition power supply, pin 4 of J1 is connected to the relay, pins 5 and 12 of J1 are used for grounding, and multiple GND pins of the JC interface are used for grounding.

[0058] Specifically, the positive terminal of the battery is connected to JK1 via F2 to power the air pump M1, and the other end is connected to J1, with the negative terminal grounded. J1 connects to the altitude and brake sensors and communicates with the CAN bus. It also connects to the ignition power supply and the relay. The JC interface provides +5VA power and multiple GND pins are grounded. The power supply and wiring harness are clearly distributed, making installation and maintenance convenient.

[0059] Working principle: The VCC input is protected against surge by TVS1, and D1 and D2 provide reverse connection and overvoltage protection. Q1, the MOSFET, is controlled by the gate signal. R1 adjusts the gate current. When the control signal turns on Q1, VDD is powered on and output. D3 and D4 provide voltage regulation protection, and C1 is used for filtering to ensure stable and reliable power supply. The U1 input voltage in the MCU power supply enters the chip through VIN. After being filtered by L1, C3, etc., the chip internally adjusts and outputs a stable +5V from OUT. The FEEDBACK pin monitors the output voltage in real time. The LED serves as a power indicator. R8 and C6 form a loop. When powered on, the LED lights up to indicate normal power supply. The VIN input voltage of U2 enters the chip after being filtered by L2. Q3, R9, and R10 form a control circuit, which controls the chip through the ON / OFF pin. C9 and C10 filter the circuit to ensure a stable +5V output.

[0060] The main control chip's reset circuit ensures normal chip initialization. The signal processing pins are connected to the height and pressure sensors, valve coils, and relays to acquire and process signals in real time before outputting control commands. The programming port uses a resistor to ensure signal stability for chip function debugging. The pressure sensor section is powered by a power pin, and the signal pins are filtered by resistors and capacitors to convert the pressure physical quantity into an electrical signal, which is then input to the main control chip for analysis and processing. The height sensor section converts height changes into an electrical signal, which is then filtered and input to the main control chip for measuring height parameters. The CAN communication circuit uses a CAN transceiver to convert the main control chip's voltage level to the CAN bus voltage level, enabling reliable data communication with other devices. The brake signal unit uses SBK SIN as input, and Q2 is used to turn the SBK SIN signal on or off to convert it to SBK. The high and low level outputs of EN enable brake status detection and signal transmission. The valve coil drive circuit uses MOSFETs such as Q4 as its core. The main control signal controls the MOSFETs to turn on or off, allowing the 12V power supply to drive the valve coil. A freewheeling diode protects the circuit. The relay drive circuit uses Q7 to control the relay coil. When the main control signal turns on Q7, the relay closes, realizing the circuit's on / off state. The voltage detection circuit uses resistors to divide the voltage, converting high voltage into a low voltage signal suitable for the main control chip to acquire, and monitors the power supply status in real time. The wiring harness and battery connectors connect to the positive and negative terminals of the battery to power the system. Grounding ensures the circuit loop is normal. The positive terminal of the battery provides power to the module through relays, etc.

[0061] 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 hardware circuit for controlling the suspension of an economical vehicle, comprising a power supply control unit, an MCU power supply, a brake signal unit, a battery, and a C33, characterized in that: The power supply control unit is equipped with TVS1, D1, D2, D3, D4, R1, R2, R3, C2, Q1, and C1. The MCU power supply upper circuit includes VDD, with U1 electrically connected to its input. C3 and C4 are also electrically connected to the input of VDD. PO1 and L1 are electrically connected to the pins of U1. D5 is electrically connected to both ends of L1. C5 and C6 are provided on the output side of the upper circuit. LED and R8 are electrically connected within the upper circuit. U2 and L2 are electrically connected to the input of the MCU power supply lower circuit. C7 and C8 are electrically connected to VDD. PO2 is located within VDD of the lower circuit. R9, Q3, and R10 are provided on PO2. D6 is provided to both ends of L2. C9 and C10 are provided on the output side of the lower circuit. A pressure sensor, a height sensor, and a main control chip are located at the output of the MCU power supply.

2. The suspension control hardware circuit for an economical vehicle according to claim 1, characterized in that: The pressure sensor includes J2, J3, and J4. J2 is electrically connected to the output terminal of the MCU power supply and has three pins for grounding to form a power loop. The MCU power supply includes resistor R19, which is electrically connected to capacitor C18 for filtering and stabilizing the sensor power supply voltage. C18 is electrically connected to resistor R20, which is also connected to C19 for filtering. R20 is electrically connected to PT1-AD. J3 has three pins for grounding to form a power loop. The MCU power supply includes resistor R21, which is electrically connected to capacitor C20 for filtering and stabilizing the sensor power supply voltage. C20 is electrically connected to resistor R22, which is also connected to C21 for filtering. R22 is electrically connected to PT2-AD. J4 has three pins for grounding to form a power loop. The MCU power supply includes resistor R21.

3. R23 is electrically connected to C22 for filtering and stabilizing the sensor power supply voltage. C22 is electrically connected to R24, which in turn is connected to C23 for filtering. R24 is also electrically connected to PT3-AD. The MCU power supply includes the main control chip. The +5V power supply from the MCU is electrically connected to the main control chip pins via R12 and R11. The +5V power supply from the MCU is connected in parallel with C11, C12, and C13 for filtering. The pins of the main control chip are electrically connected to the +5V power supply from the MCU via R15. The pins of the main control chip are electrically connected to Y1, which is connected to C11 and C12. C11 and C12 ensure the stability of Y1. The +5V power supply from the MCU is electrically connected to R14 and R13. The main control chip is electrically connected to D7 and C14 for filtering. The PA7 pin of the main control chip is electrically connected to SBK. EN, the PA8 pin of the main control chip is electrically connected to HT1-AD, the PA9 pin of the main control chip is electrically connected to HT2-AD, the PA10 pin of the main control chip is electrically connected to PT1-AD, the PA11 pin of the main control chip is electrically connected to PT2-AD, the PA12 pin of the main control chip is electrically connected to PT3-AD, the PB4, PB5, and PB6 pins of the main control chip are electrically connected to PO2, OF-VCC, and JK-IO respectively, and the PB9 and PB10 pins of the main control chip are electrically connected to CAN1-RX and CAN1 respectively. -TX is used for data communication. The PC9 and PC7 pins of the main control chip are electrically connected to the programming port CN1 for debugging. The main control chip has an RST pin. The programming port CN1 is electrically connected to the +5V power supply of the MCU. C17 is electrically connected to the programming port CN1 for filtering. The height sensor includes HT1-IN and HT2-IN. HT1-IN is electrically connected to resistors R41 and R42. The other end of R41 is grounded. C27 is electrically connected to R41 for filtering, and C28 is electrically connected to R42 for secondary filtering.The HT1-AD is electrically connected to one end of R42. The HT2-IN is electrically connected to R43 and R44. The other end of R43 is grounded. R43 is electrically connected to C29 for filtering. R44 is electrically connected to C30 for secondary filtering. The HT2-AD is electrically connected to one end of R44. The output of the main control chip is electrically connected to a valve coil drive circuit, a relay drive circuit, and a voltage detection circuit.

3. The suspension control hardware circuit for an economical vehicle according to claim 1, characterized in that: The +5VA power supply to the MCU is electrically connected to pin 3 of U5. Pin 2 of U5 is grounded. C33 is connected in parallel across the power supply for filtering. Pins 4 and 1 of U5 are electrically connected to CAN1-RX and CAN1-TX respectively for data reception. Pins 6 and 7 of U5 are connected to CAN1L and CAN1H respectively. Pin 8 of U5 is grounded through R46. CAN1L is electrically connected to pin 2 of PDS1. CAN1L and CAN1H are connected in parallel to C31 and C32 for filtering. U5 is electrically connected to R45 to ensure data integrity.

4. The hardware circuit for controlling the suspension of an economical vehicle according to claim 1, characterized in that: The brake signal unit includes SBK SIN, which is electrically connected to R4. One end of R4 is electrically connected to one end of Q2 and R5, and the other end of R5 is grounded. The +5V power supply for the MCU is electrically connected to R6, one end of which is electrically connected to the other end of Q2, R7, and C34. The other end of C34 is grounded, and R7 is electrically connected to SBK EN.

5. The suspension control hardware circuit for an economical vehicle according to claim 2, characterized in that: The valve coil drive circuit includes R25, R26, Q4, D8, R27, R28, Q5, D9, R29, R30, Q6, D10, R31, R32, Q7, and D11, which form 4 sets of solenoid valve coil drives to control the opening or closing of the solenoid valve.

6. The suspension control hardware circuit for an economical vehicle according to claim 2, characterized in that: The relay drive circuit includes R33, R34, F1, Q8, C24, and D12, which are used as the power switch for the external air pump to control whether it is inflated.

7. The suspension control hardware circuit for an economical vehicle according to claim 2, characterized in that: The voltage detection circuit includes R35, R36, R37, and C25, which together form an ignition power supply voltage divider bias circuit. The voltage detection circuit also includes R38, R39, R40, and C26, which together form a battery power supply voltage bias circuit.

8. The suspension control hardware circuit for an economical vehicle according to claim 1, characterized in that: The battery includes a positive terminal, a negative terminal, and a JC interface. The positive terminal includes F2, one end of which is electrically connected to JK1 for powering the air pump M1, and the other end of which is electrically connected to J1. The negative terminal is used for grounding. Pins 8 and 9 of J1 are electrically connected to the altitude sensor, pin 10 of J1 is electrically connected to the brake sensor, and pins 6 and 7 of J1 are electrically connected to CAN communication. One end of the air pump M1 is electrically connected to JK1, and the other end is grounded. Pins A4, B9, A13, and B4 of the JC interface provide +5VA USB power. Pin 3 of J1 is electrically connected to the ignition power supply, pin 4 of J1 is connected to a relay, pins 5 and 12 of J1 are used for grounding, and multiple GND pins of the JC interface are used for grounding.

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