Motor protection circuit for automobile shock absorber

Abstract

The utility model discloses a motor protection circuit for automobile shock absorbers, which is used for controlling four shock absorbers respectively mounted corresponding to four wheels of an automobile, and comprises a power supply module, a control module, four motor speed detection modules and a motor overcurrent protection module, the power supply module is used for supplying power to the control module, the motor speed detection module and the motor overcurrent protection module; each motor overcurrent protection module comprises a field effect transistor and an overcurrent protection relay; drain electrodes of the field-effect transistors are connected with the corresponding motor speed detection modules, grid electrodes of the field-effect transistors are connected with the control module, and source electrodes of the field-effect transistors are connected with the corresponding overcurrent protection relays; the motor speed detection module is used for detecting the corresponding motor running speed; and the control module is used for controlling the on-off of the overcurrent protection relay according to the detection result of the motor speed detection module so as to realize the motor overcurrent protection of the shock absorber. According to the utility model, the service lives of the motor and the shock absorber are prolonged.

Description

[Technical field]

[0001] The utility model relates to the technical field of shock absorbers, in particular to a motor protection circuit for automobile shock absorbers. [Background technology]

[0002] The suspension system of a vehicle generates certain vibrations during driving due to the impact of elastic elements. In order to improve the smoothness of the car's driving, the suspension system and hydraulic / nitrogen shock absorbers work as follows: when the frame (or body) and the axle are vibrated and move relative to each other, the motor controls the piston in the shock absorber to move up and down according to the vibration amplitude, so that the oil in the shock absorber cavity repeatedly flows from one cavity to another through different pores. At this time, the friction between the pore wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into oil heat energy, which is then absorbed by the shock absorber and dissipated into the atmosphere.

[0003] However, when the car vibrates with a large amplitude, it may cause the motor to run too fast, resulting in excessive current in the motor, which may damage the motor and cause the adverse consequence of shock absorber failure.

[0004] In view of this, it is necessary to provide a motor protection circuit for an automobile shock absorber to overcome the above-mentioned defects. [Contents of the utility model]

[0005] The utility model aims to provide a motor protection circuit for automobile shock absorbers, aiming to improve the problem that the motor of the existing shock absorber may be damaged due to overcurrent and to increase the service life of the automobile shock absorber.

[0006] In order to achieve the above-mentioned object, the utility model provides a motor protection circuit for automobile shock absorbers, which is used to control four shock absorbers respectively installed corresponding to four wheels of the automobile, including: a power supply module, a control module, four motor speed detection modules and a motor overcurrent protection module connected to the motor speed detection modules one by one;

[0007] The power supply module is used to supply power to the control module, the motor speed detection module and the motor overcurrent protection module; each of the motor overcurrent protection modules includes a field effect tube and an overcurrent protection relay; the drain of the field effect tube is connected to the corresponding motor speed detection module, the gate is connected to the control module, and the source is connected to the corresponding overcurrent protection relay;

[0008] The motor speed detection module is used to detect the corresponding motor running speed; the control module is used to control the on and off of the overcurrent protection relay according to the detection result of the motor speed detection module to achieve overcurrent protection for the shock absorber motor.

[0009] In a preferred embodiment, the control module includes four motor power control pins Dx_EN and four current detection pins A_DET_x;

[0010] Each of the motor speed detection modules includes a first processor and an OUT pin and an IN+ pin provided on the first processor; the OUT pin is connected to the corresponding current detection pin A_DET_x, the drain of the field effect transistor is connected to the corresponding IN+ pin, the gate is connected to the corresponding motor power control pin Dx_EN, and the source is connected to the corresponding interface Dx- of the overcurrent protection relay.

[0011] In a preferred embodiment, it also includes a driving protection module; the driving protection module includes a second processor and a BSG1-IN1 pin, a BSG1-IN2 pin, a BSG2-IN1 pin, and a BSG2-IN2 pin which are arranged on the second processor and are respectively connected to an interface of the four overcurrent protection relays, and a BSG1- pin, a BSG1+ pin, a BSG2- pin, and a BSG2+ pin which are respectively connected to four pins of the control module.

[0012] In a preferred embodiment, the control module is connected to a NC relay with four interfaces; the control module includes a UART-RX interface and a UART-TX interface; the first interface of the NC relay is connected to the power supply module, the second interface and the third interface are respectively connected to the UART-RX interface and the UART-TX interface, and the fourth interface is grounded.

[0013] In a preferred embodiment, the power supply module further includes a power supply protection unit; the power supply protection unit is electrically connected to the control module and the power supply module.

[0014] In a preferred embodiment, the power supply module is an independent power supply or a vehicle-mounted power supply.

[0015] In a preferred embodiment, it further includes a display module, the display module includes a CON relay with four interfaces; the control module includes an OLED-RX interface and an OLED-TX interface; two interfaces of the CON relay are respectively connected to the OLED-RX interface and the OLED-TX interface.

[0016] The motor protection circuit for automobile shock absorbers provided by the utility model detects the corresponding motor running speed through the motor speed detection module, and the control module controls the on and off of the overcurrent protection relay according to the detection result of the motor speed detection module to realize the motor overcurrent protection of the shock absorber, thereby improving the service life of the motor and the shock absorber. In addition, the control module can control each motor individually, thereby improving the precise control of each shock absorber.

Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A circuit diagram of a control module in a motor protection circuit for an automobile shock absorber;

[0019] Figure 2 The circuit diagram of the power supply module outputs D1_POWER and D2_POWER in the motor protection circuit for automobile shock absorbers;

[0020] Figure 3 This is a circuit diagram for outputting 5V_POWER from the power supply module in the motor protection circuit for automobile shock absorbers;

[0021] Figure 4 A connection circuit diagram of a power protection unit and a power supply module in a motor protection circuit for an automobile shock absorber;

[0022] Figure 5 The circuit diagram of four motor speed detection modules in the motor protection circuit for automobile shock absorber;

[0023] Figure 6 The circuit diagram is a circuit diagram of the field effect transistors of four motor overcurrent protection modules in the motor protection circuit of the automobile shock absorber;

[0024] Figure 7 A circuit diagram of an overcurrent protection relay for four motor overcurrent protection modules in a motor protection circuit for an automobile shock absorber;

[0025] Figure 8 A circuit diagram of a drive protection module in a motor protection circuit for an automobile shock absorber;

[0026] Fig. 9 The figure is a circuit diagram of a display module in a motor protection circuit for an automobile shock absorber.

[0027] Fig.10 This is a connection diagram of relay J12 in the motor protection circuit for automobile shock absorbers. [Specific implementation method]

[0028] In order to make the purpose, technical solution and beneficial technical effect of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the utility model, and are not intended to limit the utility model.

[0029] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] In an embodiment of the utility model, a motor protection circuit for automobile shock absorbers is provided, which is used to control four shock absorbers respectively installed corresponding to the four wheels of the automobile. Among them, the motor protection circuit for automobile shock absorbers includes: a power supply module, a control module, four motor speed detection modules and a motor overcurrent protection module connected to the motor speed detection modules in a one-to-one correspondence. Specifically, each motor speed detection module and its corresponding motor overcurrent protection module control a motor. In this embodiment, the motor can be a BSG servo with a maximum supply voltage of 7.4V.

[0032] like Figure 1 As shown, the control module U4 can be an electronic component such as a chip or a microprocessor, including: four motor power control pins Dx_EN, four current detection pins A_DET_x (x is 1, 2, 3, and 4, corresponding to the four shock absorbers of four cars respectively), a power adjustment pin DC-DET, a BSG1-IN1 pin, a BSG1-IN2 pin, a BSG2-IN1 pin, a BSG2-IN2 pin, a UART-RX pin, a UART-TX pin, an OLED-RX pin, and an OLED-TX pin, and is connected to a 3.3V power supply output by a power supply module.

[0033] Furthermore, if Fig.10As shown, the control module is connected to a four-interface NC relay J12. The first interface of the NC relay J12 is connected to the power supply module (5V_POWER), the second interface and the third interface are connected to the UART-RX interface and the UART-TX interface respectively, and the fourth interface is grounded.

[0034] The power supply module is used to supply power to the control module, motor speed detection module and motor overcurrent protection module. The power supply module is an independent power supply or a vehicle-mounted power supply. Figure 2 As shown, the power supply module outputs two interfaces D1_POWER and D2_POWER from the PCDD interface through two sets of identical electronic components, and another set of electronic components outputs the 5V_POWER power interface. For example, a set of electronic components that output D1_POWER includes: processor U10, capacitors C1 / C8 / C11 / C23, electrolytic capacitor C9, resistors R19 / R20, Schottky diode D7, inductor L1. The specific connection relationship can be referred to Figure 2 In addition, a group of electronic components that output the 5V_POWER power interface include processor U9, capacitors C33 / C34 / C32, electrolytic capacitor C35, Schottky diode D5, resistors R5 / R6 / R21, and inductor L6. The specific connection relationship can be referred to Figure 3 , I will not go into details here.

[0035] Furthermore, the power supply module also includes a power supply protection unit. The power supply protection unit is electrically connected to the control module and the power supply module. Figure 4 The power protection unit includes relay CON2, processor L40, capacitor C24 / C22 / C21, electrolytic capacitor C7, Schottky diode D1 / D1 / D3 / D4, resistor F1 / R31 / R32, resistor R31 and R32 are connected to the power adjustment pin DC-DET, the connection relationship of the above electronic components can be referred to Figure 4 The protection current of the power protection unit can be set to about 10A, considering the current of each motor, DC / DC loss, and the current of components such as the display panel.

[0036] In an embodiment of the utility model, each motor overcurrent protection module includes a field effect tube (Q1\Q2\Q3\Q4) and an overcurrent protection relay (J1\J2\J3\J4). The drain of the field effect tube is connected to the corresponding motor speed detection module, the gate is connected to the control module, and the source is connected to the corresponding overcurrent protection relay. The motor speed detection module is used to detect the corresponding motor running speed; the control module is used to control the on and off of the overcurrent protection relay according to the detection result of the motor speed detection module, so as to realize the motor overcurrent protection of the shock absorber.

[0037] Specifically, Figure 5 As shown, each motor speed detection module includes a first processor (U2\U3\U6\U7) and an OUT pin and an IN+ pin provided on the first processor. The OUT pin is connected to the corresponding current detection pin A_DET_x, the drain of the field effect tube is connected to the corresponding IN+ pin, the gate is connected to the corresponding motor power control pin Dx_EN, and the source is connected to the interface Dx- of the corresponding overcurrent protection relay.

[0038] Take one of the motor speed detection modules as an example, including: a first processor U2, a capacitor C28, and resistors R7 / R8. The specific connection relationship can be referred to Figure 5 , I will not go into details here. Take one of the motor overcurrent protection modules as an example, including: field effect tube Q1, resistor R9, relay J1, resistor R1, capacitor C10 / C12, and its specific connection relationship can be referred to Figure 6 and Figure 7 , I will not go into details here.

[0039] Furthermore, the circuit also includes a driving protection module. The driving protection module includes a second processor and BSG1-IN1 pin, BSG1-IN2 pin, BSG2-IN1 pin, BSG2-IN2 pin, which are arranged on the second processor and are respectively connected to one interface of four overcurrent protection relays, and BSG1- pin, BSG1+ pin, BSG2- pin, BSG2+ pin, which are respectively connected to four pins of the control module. Figure 8 As shown, the drive protection module includes a second processor U5 and its multiple pins, a capacitor C6 and an inductor L9. The specific layout and connection relationship can be referred to Figure 8 , I will not go into details here.

[0040] Furthermore, the circuit also includes a display module. Fig. 9 As shown, the display module includes a four-interface CON relay J5. Two of the interfaces of the CON relay J5 are respectively connected to the OLED-RX interface and the OLED-TX interface. Specifically, the display module includes a relay J5, capacitors C2 / C20 / C26 / C27, an electrolytic capacitor C19, an inductor L7, and resistors R56 / R55. The specific connection relationship can be referred to Fig. 9 , I will not go into details here.

[0041] It should be noted that in order to focus on the circuit diagram of each module, the above Figure 1-Figure 10 In the diagram, when the labels of the interfaces, pins, and nodes are consistent, they represent corresponding electrical connections. Figure 5 Contains the circuit diagram of four motor speed detection modules, Figure 6 and Figure 7 Contains circuit diagrams of four motor overcurrent protection modules.

[0042] In addition, the processor involved in the utility model can be a microcontroller unit (MCU, also known as a single chip microcomputer (Single Chip Microcomputer) or a single chip microcomputer, which appropriately reduces the frequency and specifications of the central processing unit, and integrates memory (memory), counter (Timer), USB, A / D conversion, UART, PLC, DMA and other peripheral interfaces, and even LCD drive circuits on a single chip to perform different combination controls for different application scenarios. It can be understood that in this embodiment, the processor can be an FPGA or a PLC controller, and the model and structure of the microcontroller unit are not specifically limited here.

[0043] In summary, the motor protection circuit for automobile shock absorbers provided by the utility model detects the corresponding motor running speed through the motor speed detection module, and the control module controls the on and off of the overcurrent protection relay according to the detection result of the motor speed detection module to realize the motor overcurrent protection of the shock absorber, thereby improving the service life of the motor and the shock absorber. In addition, the control module can control each motor individually, thereby improving the precise control of each shock absorber.

[0044] The present invention is not limited to what is described in the specification and implementation modes, and therefore, additional advantages and modifications can be easily realized by those familiar with the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A motor protection circuit for automobile shock absorbers, used to control four shock absorbers respectively installed corresponding to four wheels of the automobile, characterized in that: include: A power supply module, a control module, four motor speed detection modules, and a motor overcurrent protection module connected to the motor speed detection modules in a one-to-one correspondence; The power supply module is used to supply power to the control module, the motor speed detection module and the motor overcurrent protection module; each of the motor overcurrent protection modules includes a field effect tube and an overcurrent protection relay; the drain of the field effect tube is connected to the corresponding motor speed detection module, the gate is connected to the control module, and the source is connected to the corresponding overcurrent protection relay; The motor speed detection module is used to detect the corresponding motor running speed; the control module is used to control the on and off of the overcurrent protection relay according to the detection result of the motor speed detection module to achieve overcurrent protection for the shock absorber motor.

2. The motor protection circuit for automobile shock absorber according to claim 1, characterized in that: The control module includes four motor power control pins Dx_EN and four current detection pins A_DET_x; Each of the motor speed detection modules includes a first processor and an OUT pin and an IN+ pin provided on the first processor; the OUT pin is connected to the corresponding current detection pin A_DET_x, the drain of the field effect transistor is connected to the corresponding IN+ pin, the gate is connected to the corresponding motor power control pin Dx_EN, and the source is connected to the corresponding interface Dx- of the overcurrent protection relay.

3. The motor protection circuit for automobile shock absorber according to claim 2, characterized in that: It also includes a driving protection module; the driving protection module includes a second processor and a BSG1-IN1 pin, a BSG1-IN2 pin, a BSG2-IN1 pin, and a BSG2-IN2 pin which are arranged on the second processor and are respectively connected to an interface of the four overcurrent protection relays, and a BSG1- pin, a BSG1+ pin, a BSG2- pin, and a BSG2+ pin which are respectively connected to four pins of the control module.

4. The motor protection circuit for automobile shock absorber according to claim 3, characterized in that: The control module is connected to a NC relay with four interfaces; the control module includes a UART-RX interface and a UART-TX interface; the first interface of the NC relay is connected to the power supply module, the second interface and the third interface are respectively connected to the UART-RX interface and the UART-TX interface, and the fourth interface is grounded.

5. The motor protection circuit for automobile shock absorber according to claim 1, characterized in that: The power supply module also includes a power supply protection unit; the power supply protection unit is electrically connected to the control module and the power supply module.

6. The motor protection circuit for automobile shock absorber according to claim 1, characterized in that: The power supply module is an independent power supply or a vehicle-mounted power supply.

7. The motor protection circuit for automobile shock absorber according to claim 1, characterized in that: It also includes a display module, which includes a CON relay with four interfaces; the control module includes an OLED-RX interface and an OLED-TX interface; two interfaces of the CON relay are respectively connected to the OLED-RX interface and the OLED-TX interface.

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