Semi-active suspension control system

Abstract

The invention discloses a semi-active suspension control system. The system comprises a main control module, and a signal output module, a signal detection module, a CAN module and a driving module which are electrically connected with the main control module, the signal output module is used for outputting an inductance response signal according to the inductance signal and the trigger inductance signal; the signal detection module is used for detecting acceleration signals of all axes on the semi-active suspension; the CAN module is used for reading vehicle motion parameters; the main control module is used for determining height signals of all shafts on the semi-active suspension according to the time of the inductance response signals and outputting current driving instructions according to the height signals, the acceleration signals and the vehicle motion parameters; and the driving module is used for controlling the opening degree of an electromagnetic valve in the shock absorber according to the current driving instruction. According to the scheme, the damping parameters are adjusted by sensing the semi-active suspension parameters and the vehicle body motion parameters, and therefore the vehicle running smoothness and stability are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of automobile technology, and in particular to a semi-active suspension control system. Background Art

[0002] Semi-active suspension is a kind of controllable suspension. It does not change the suspension stiffness but only changes the suspension damping to adjust the suspension performance. Therefore, it is also called damping controllable suspension. Its structure is relatively simple, low cost, excellent performance, and has a wide range of application prospects. With the development of technology and the improvement of manufacturing process, the application of controllable suspension in automobiles has become possible. The intelligent control of the suspension system can make it have different performance according to different road conditions, thereby coordinating the contradiction between smoothness and stability, and also providing the possibility of expanding the functions of traditional suspension.

[0003] Once the traditional suspension parameters are selected, they are difficult to change, so in the design process, an optimal compromise is usually sought to determine the parameters. That is, the performance of the car is optimal only under certain working conditions; once the working conditions change (such as changes in the road surface, changes in the acceleration, braking, and steering state of the car), its performance will deteriorate, which means that traditional suspension is difficult to meet the requirements of comfort and stability at the same time, thus limiting the further improvement of car performance. Summary of the invention

[0004] The present invention provides a semi-active suspension control system, which can adjust damping parameters by sensing semi-active suspension parameters and vehicle body motion parameters, thereby improving the driving smoothness and stability of the vehicle.

[0005] To achieve the above objectives, an embodiment of the present invention provides a semi-active suspension control system, which includes: a main control module and a signal output module, a signal detection module, a CAN module and a drive module electrically connected to the main control module;

[0006] The signal output module is used to output an inductance response signal according to the inductance signal and the trigger inductance signal; the signal detection module is used to detect the acceleration signal of each axis on the semi-active suspension; the CAN module is used to read the vehicle motion parameters;

[0007] The main control module is used to determine the height signal of each axle on the semi-active suspension according to the time of the inductance response signal, and output the current drive instruction according to the height signal, the acceleration signal and the vehicle motion parameter; the drive module is used to control the opening of the solenoid valve in the shock absorber according to the current drive instruction.

[0008] Optionally, the system further comprises: a height adjustment switch detection module and a height adjustment control module; the height adjustment switch detection module and the height adjustment control module are electrically connected to the main control module;

[0009] The height adjustment switch detection module is used to detect different switch states output under the user's height adjustment command; the main control module is also used to receive and output height adjustment control commands to the height adjustment control module according to the different switch states; the height adjustment control module is used to control the airbag inflation size according to the height adjustment control command.

[0010] Optionally, the signal output module includes a signal output unit and a first ADC sampling unit; the signal output unit is electrically connected to the first ADC sampling unit; the first ADC sampling unit is electrically connected to the main control module;

[0011] The signal output unit is used to output an inductance response analog signal according to the inductance signal and the trigger inductance signal; the first ADC sampling unit is used to convert the inductance response analog signal into an inductance response digital signal and output it to the main control module.

[0012] Optionally, the signal output unit includes a first inductance signal trigger unit, a second inductance signal trigger unit, a first inductance signal input unit, a second inductance signal input unit, an isolation unit and an inductance response signal output unit;

[0013] The first inductance signal input unit is used to output a first inductance signal;

[0014] The first inductance signal trigger unit is used to output a first inductance signal trigger signal so that the first inductance signal is sent to the inductance response signal output unit;

[0015] The second inductance signal input unit is used to output a second inductance signal;

[0016] The second inductance signal trigger unit is used to output a second inductance signal trigger signal so that the second inductance signal is sent to the inductance response signal output unit;

[0017] The inductance response signal output unit is used to output an inductance response signal according to the first inductance signal, the second inductance signal and the negative voltage input protection signal;

[0018] The isolation unit is used to isolate the first inductance signal from the second inductance signal.

[0019] Optionally, the negative voltage input protection circuit includes a fifth transistor, a constant voltage source, a third pull-up resistor and a third pull-down resistor;

[0020] The first end of the fifth transistor is electrically connected to the second input end of the comparator; the second end of the fifth transistor is electrically connected to the ground end of the main control module through the third pull-down resistor; and the control end of the fifth transistor is electrically connected to the ground end of the main control module through the third pull-up resistor.

[0021] Optionally, the signal detection module includes an accelerator signal detection unit and a second ADC sampling unit; the accelerator signal detection unit and the second ADC sampling unit are electrically connected; the second ADC sampling unit is electrically connected to the main control module;

[0022] The accelerator signal detection unit is used to detect the acceleration analog signal of each axis on the semi-active suspension; the second ADC sampling unit is used to convert the acceleration analog signal into an acceleration digital signal and output it to the main control module.

[0023] Optionally, the accelerator signal detection unit includes: an acceleration signal detection control chip and an acceleration signal sensor;

[0024] The main control module is electrically connected to the SPI pin of the acceleration signal detection control chip; the PSI5 pin of the acceleration signal detection control chip is electrically connected to the accelerator signal sensor; and the accelerator signal sensor is electrically connected to the main control module through the second ADC sampling unit.

[0025] Optionally, the CAN module includes a CAN transceiver and a CAN controller; the CAN transceiver is electrically connected to the CAN controller; the CAN controller is electrically connected to the main control module; the CAN controller is used to read the vehicle motion parameters through the CAN transceiver and send the vehicle motion parameters to the main control module.

[0026] Optionally, the driving module includes a first IO unit and a shock absorber driving unit; and the main control module is electrically connected to the shock absorber driving unit through the first IO unit.

[0027] Optionally, the height adjustment switch detection module includes a height adjustment switch detection unit and a second IO unit; the height adjustment control module includes a third IO unit and a height adjustment control unit;

[0028] The height adjustment switch detection unit is connected to the main control module through the second IO unit;

[0029] The main control module is connected to the height adjustment control unit through the third IO unit.

[0030] Optionally, the height adjustment switch detection unit includes: a level signal adjustment circuit and a switch state output circuit; the switch state output circuit is used to output different switch states when the level signal adjustment circuit outputs different level states.

[0031] Optionally, the height adjustment control module includes an airbag drive circuit.

[0032] In an embodiment of the present invention, the signal output module outputs an inductance response signal according to the inductance signal and the trigger inductance signal; the signal detection module detects the acceleration signal of each axis on the semi-active suspension; the CAN module reads the vehicle motion parameters; the main control module determines the height signal of each axis on the semi-active suspension according to the time of the inductance response signal, and outputs a current drive instruction according to the height signal, the acceleration signal and the vehicle motion parameter; the drive module controls the opening of the solenoid valve in the shock absorber according to the current drive instruction, so as to adjust the damping parameters by sensing the semi-active suspension parameters and the vehicle body motion parameters, thereby improving the driving smoothness and stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a structural schematic diagram of a semi-active suspension control system provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of another semi-active suspension control system provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of another semi-active suspension control system provided by an embodiment of the present invention;

[0036] Figure 4 is a specific circuit diagram of a signal output module provided by an embodiment of the present invention;

[0037] Figure 5 is another specific circuit diagram of the signal output module provided by an embodiment of the present invention;

[0038] Figure 6 is a schematic structural diagram of another semi-active suspension control system provided by an embodiment of the present invention;

[0039] Figure 7 is a schematic structural diagram of another semi-active suspension control system provided by an embodiment of the present invention;

[0040] Figure 8 is a schematic structural diagram of another semi-active suspension control system provided by an embodiment of the present invention;

[0041] Fig. 9 It is a specific circuit diagram of a height adjustment switch detection module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] Figure 1 is a schematic diagram of the structure of a semi-active suspension control system provided by an embodiment of the present invention, such as Figure 1 As shown, the semi-active suspension control system includes: a main control module 10 and a signal output module 20, a signal detection module 30, a CAN module 40 and a drive module 50 electrically connected to the main control module 10; the signal output module 20 is used to output an inductance response signal according to the inductance signal and the trigger inductance signal; the signal detection module 30 is used to detect the acceleration signal of each axis on the semi-active suspension; the CAN module 40 is used to read the vehicle motion parameters;

[0044] The main control module 10 is used to determine the height signal of each axis on the semi-active suspension according to the time of the inductance response signal, and output the current drive instruction according to the height signal, acceleration signal and vehicle motion parameters; the drive module 50 is used to control the opening of the solenoid valve in the shock absorber according to the current drive instruction.

[0045] Among them, the vehicle motion parameters may include speed parameters, throttle parameters and braking parameters; the inductance signal is a signal corresponding to the height of each shaft on the semi-active suspension; when the height of each shaft on the semi-active suspension is sensed to change, the inductance signal changes; the trigger inductance signal is a signal that enables the inductance signal to be energized; the inductance response signal is a signal after the inductance signal changes in response to a preset time through the signal output module 20; the time of the inductance response signal is the preset time; when the height of each shaft on the semi-active suspension is sensed to change, the inductance signal changes, and the preset time for the inductance signal to respond through the signal output module 20 also changes, that is, the time of the inductance response signal changes, and the main control module 10 can determine the height signal of each shaft (I axis, II axis and III axis) on the semi-active suspension according to the time of the inductance response signal;

[0046] In this embodiment, the signal output module 20 outputs an inductance response signal; the signal detection module 30 detects the acceleration signal of each axis on the semi-active suspension; the CAN module 40 reads the vehicle motion parameters; the main control module 10 determines the height signal of each axis on the semi-active suspension according to the time of the inductance response signal, and outputs a current drive instruction according to the height signal, the acceleration signal and the vehicle motion parameters; the drive module 50 controls the opening of the solenoid valve in the shock absorber according to the current drive instruction, so as to adjust the damping parameters by sensing the semi-active suspension parameters and the vehicle body motion parameters, thereby improving the driving smoothness and stability of the vehicle.

[0047] Optionally, based on the above embodiment, further optimization is performed: Figure 2 is a schematic diagram of the structure of another semi-active suspension control system provided by an embodiment of the present invention. Figure 2 As shown, the semi-active suspension control system further includes: a height adjustment switch detection module 60 and a height adjustment control module 70; the height adjustment switch detection module 60 and the height adjustment control module 70 are electrically connected to the main control module 10;

[0048] The height adjustment switch detection module 60 is used to detect different switch states output under the user's height adjustment command; the main control module 10 is also used to receive and output the height adjustment control command to the height adjustment control module 70 according to the different switch states; the height adjustment control module 70 is used to control the airbag inflation size according to the height adjustment control command. Among them, the height adjustment control module 70 can include an airbag driving circuit; the height adjustment control module 70 can control the airbag inflation size according to the height adjustment control command, thereby adjusting the height of the semi-active suspension, thereby completing the switching of the vehicle standard, sports and comfort modes; thus, on the basis of the above embodiment, the height adjustment of the semi-active suspension is further realized, thereby switching the vehicle mode, providing users with multiple modes.

[0049] Optional, Figure 3 is a schematic diagram of the structure of another semi-active suspension control system provided by an embodiment of the present invention. Figure 3 As shown, the signal output module 20 in the system includes a signal output unit 21 and a first ADC sampling unit 22; the signal output unit 21 is electrically connected to the first ADC sampling unit 22; the first ADC sampling unit 22 is electrically connected to the main control module 10; the signal output unit 21 is used to output an inductance response analog signal according to the inductance signal and the trigger inductance signal; the first ADC sampling unit 22 is used to convert the inductance response analog signal into an inductance response digital signal and output it to the main control module 10; the main control module 10 thereby resolves the height signal of each axis according to the time of the inductance response digital signal.

[0050] Optional, continue to refer to Figure 3The signal output unit 21 includes a first inductance signal trigger unit 211, a second inductance signal trigger unit 212, a first inductance signal input unit 213, a second inductance signal input unit 214, an isolation unit 215 and an inductance response signal output unit 216; the first inductance signal input unit 213 is used to output a first inductance signal; the first inductance signal trigger unit 211 is used to output a first inductance signal trigger signal so that the first inductance signal is sent to the inductance response signal output unit 216;

[0051] The second inductance signal input unit 214 is used to output the second inductance signal; the second inductance signal trigger unit 212 is used to output the second inductance signal trigger signal so that the second inductance signal is sent to the inductance response signal output unit 216;

[0052] The inductance response signal output unit 216 is used to output the inductance response signal according to the first inductance signal, the second inductance signal and the negative pressure signal; the isolation unit 215 is used to isolate the first inductance signal and the second inductance signal. The first inductance signal and the second inductance signal are signals corresponding to the height of the left and right sides of any axle on the semi-active suspension; the isolation unit 215 can isolate the first inductance signal and the second inductance signal to prevent the crosstalk of the two inductance signals, thereby affecting the output of the inductance response signal; specifically, this embodiment uses the two inductance signals corresponding to the height of the left and right sides of any axle on the semi-active suspension to accurately measure the height signal of any axle on the semi-active suspension.

[0053] Optional, Figure 4 is a specific circuit diagram of the signal output module provided by an embodiment of the present invention; Figure 4 As shown, the first inductor signal input unit 213 includes a first inductor L1, a first diode D1, a first transistor K1, a first pull-up resistor R11 and a first pull-down resistor R21; the second inductor signal input unit 214 includes a second inductor L2, a second diode D2, a second transistor K2, a second pull-up resistor R12 and a second pull-down resistor R22;

[0054] The first inductance signal trigger unit 211 includes a first resistor R01 and a third transistor K3; the second inductance signal trigger unit 212 includes a second resistor R02 and a fourth transistor K4;

[0055] The isolation unit 215 includes a first reverse diode F1, a second reverse diode F2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6;

[0056] The inductance response signal output unit 216 includes a comparator U;

[0057] The first end of the first inductor L1 receives the first inductor signal High-sensor1; the first end of the first inductor L1 is electrically connected to the first end of the first reverse diode F1;

[0058] The first end of the second inductor L2 receives the second inductor signal High-sensor2; the first end of the second inductor L2 is electrically connected to the first end of the second reverse diode F2; the second end of the first reverse diode F2 and the second end of the second reverse diode F1 are both grounded, and the first end of the third diode D3 is electrically connected to the first end of the fourth diode D4;

[0059] The second end of the third diode D3 is electrically connected to the first end of the fifth diode D5; the second end of the fifth diode D5 is electrically connected to the second end of the first inductor L1 and the first end of the first diode D1; the second end of the first diode D1 is electrically connected to the first end of the first transistor K1; the second end of the first transistor K1 is electrically connected to the first end of the first pull-up resistor R11; the second end of the first pull-up resistor R11 is electrically connected to the control end of the first transistor K1 and the first end of the first pull-down resistor R21;

[0060] The second end of the first pull-down resistor R21 is electrically connected to the first end of the third triode K3; the second end of the third triode K3 is electrically connected to the first end of the fourth triode K4 and both are grounded; the second end of the fourth triode K4 is electrically connected to the first end of the second pull-down resistor R22; the second end of the second pull-down resistor R22 is electrically connected to the first end of the second pull-up resistor R12 and the control end of the second triode K2;

[0061] The second end of the fourth diode D4 is electrically connected to the first end of the sixth diode D6; the second end of the sixth diode D6 is electrically connected to the second end of the second inductor L2 and the first end of the second diode D2; the second end of the second diode D2 is electrically connected to the first end of the second transistor K2; the second end of the second transistor K2 is electrically connected to the first end of the second pull-up resistor R12 and the second end of the first transistor K1; the second end of the second transistor K2 is also electrically connected to the first input end of the comparator U; the second input end of the comparator U is electrically connected to the negative voltage input protection circuit; the output end of the comparator U outputs the inductance response signal High-sensor-ST;

[0062] The control end of the third transistor K3 receives the first inductance signal trigger signal High-sensor-select1; the control end of the fourth transistor K4 receives the second inductance signal trigger signal High-sensor-select2.

[0063] Specifically, the working principle of the signal output module 20 is as follows: the first end of the first inductor L1 receives the first inductor signal High-sensor1 as a low level; at the same time, the control end of the third transistor K3 receives the first inductor signal trigger signal High-sensor-select1 as a high level, so that the third transistor K3 is turned on, and the third transistor K3 is turned on to pull down the control end of the first transistor K1, so that the first transistor K1 is turned on, so that the first inductor signal High-sensor1 received by the first end of the first inductor L1 is transmitted to the first input end of the comparator U; at the same time, the first end of the second inductor L2 receives the second inductor signal High-sensor2 as a low level, and at the same time, the control end of the fourth transistor K4 receives the second inductor signal trigger signal High-sensor-select2 as a high level, so that the fourth transistor K4 is turned on, and the fourth transistor K4 is turned on to pull The control end of the second transistor K2 is low, so that the second transistor K2 is turned on, so that the second inductance signal High-sensor2 received by the first end of the second inductor L2 is transmitted to the first input end of the comparator U; so that the comparator U outputs the inductance response signal according to the first inductance signal, the second inductance signal and the negative voltage input protection signal; specifically, when the first input end of the comparator U receives the first inductance signal and the second inductance signal at the same time, and the second input end receives the negative voltage input protection signal, the inductance response signal output by the comparator U is low level; the main control module 10 can determine the height signal of each axis according to the receiving time t2 of the inductance response signal; the receiving time t2 of the inductance response signal is the first inductance signal, or the second inductance signal, or the first inductance signal trigger signal, or the second inductance signal trigger signal as the starting time t1, the first inductance signal, or the second inductance signal After the inductance signal passes through the signal output module, the output time of the inductance signal. The first inductance L1 and the second inductance L2 both play a filtering role; each pull-up resistor and each pull-down resistor can ensure the normal operation of the corresponding transistors. The first diode D1 and the second diode D2 play a role in preventing reverse connection; the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 play a role in isolating the two inductance signals after passing through the inductors; the first reverse diode F1 and the second reverse diode F2 play a role in isolating the first inductance signal and the second inductance signal.

[0064] It should also be noted that in this embodiment, the comparator U will output the inductance response signal based on the first inductance signal, the second inductance signal and the negative voltage input protection signal at the same time, rather than directly outputting the inductance response signal based on the first inductance signal and the negative voltage signal, or directly outputting the inductance response signal based on the second inductance signal and the negative voltage signal; this can make the inductance response signal output more accurate.

[0065] Optional, Figure 5is another specific circuit diagram of the signal output module provided by an embodiment of the present invention, such as Figure 5 As shown, refer to Figure 5 The negative voltage input protection circuit A includes a fifth transistor K5, a constant voltage source VCC, a third pull-up resistor R13 and a third pull-down resistor R23; the first end of the fifth transistor K5 is electrically connected to the second input end of the comparator U; the second end of the fifth transistor K5 is electrically connected to the ground end of the main control module 10 through the third pull-down resistor R23; the control end of the fifth transistor K5 is electrically connected to the ground end of the main control module 10 through the third pull-up resistor R13.

[0066] Among them, the control end of the fifth triode K5 is electrically connected to the ground end of the main control module 10 through the third pull-up resistor R13, so that the fifth triode K5 is often in a disconnected state, so that the voltage source VCC can maintain a high level state, so that the second input end of the comparator U can maintain a high level state, so that the inductance response signal output by the comparator U remains in a low level state. The third pull-up resistor R13 and the third pull-down resistor R23 can ensure that the fifth triode K5 works normally. Of course, in some embodiments, the negative voltage input protection circuit A also includes a filter capacitor C.

[0067] Optional, Figure 6 is a schematic diagram of the structure of another semi-active suspension control system provided by an embodiment of the present invention. Figure 6 As shown, the signal detection module 30 in the system includes an accelerator signal detection unit 31 and a second ADC sampling unit 32; the accelerator signal detection unit 31 and the second ADC sampling unit 32 are electrically connected; the second ADC sampling unit 32 is electrically connected to the main control module 10; the accelerator signal detection unit 31 is used to detect the acceleration analog signal of each axis on the semi-active suspension; the second ADC sampling unit 32 is used to convert the acceleration analog signal into an acceleration digital signal and output it to the main control module 10. The main control module 10 thus parses the acceleration signal of each axis according to the acceleration digital signal.

[0068] Optional, continue to refer to Figure 6The accelerator signal detection unit 31 includes: an acceleration signal detection control chip 311 and an acceleration signal sensor 312; the main control module 10 is electrically connected to the SPI pin of the acceleration signal detection control chip 311; the PSI5 pin of the acceleration signal detection control chip 311 is electrically connected to the accelerator signal sensor 312; the accelerator signal sensor 312 is electrically connected to the main control module 10 through the second ADC sampling unit 32. Specifically, the main control module 10 can control the acceleration signal detection control chip 311 to work through SPI communication; the acceleration signal detection control chip 311 controls the acceleration sensor 3112 to collect the corresponding acceleration analog signal through the PSI5 protocol, and the accelerator signal sensor 312 sends the acceleration analog signal to the second ADC sampling unit 32. The model of the acceleration signal detection control chip 311 can be L9663.

[0069] Optional, Figure 7 is a schematic diagram of the structure of another semi-active suspension control system provided by an embodiment of the present invention. Figure 7 As shown, the CAN module 40 in the system includes a CAN transceiver 41 and a CAN controller 42; the CAN transceiver 41 is electrically connected to the CAN controller 42; the CAN controller 42 is electrically connected to the main control module 10; the CAN controller 42 is used to read the vehicle motion parameters through the CAN transceiver 41, and send the vehicle motion parameters to the main control module 10, so that the main control module 10 reads the vehicle motion parameters.

[0070] Optional, continue to refer to Figure 7 , the CAN controller 42 includes: a CAN chip 421; a wake-up terminal of the CAN chip 421 and a signal terminal of the CAN chip 421 are electrically connected to the CAN transceiver 41; a power supply terminal VDD of the CAN chip 421 is electrically connected to a voltage circuit VDD (19V); a signal power supply terminal VIO (3.3V) of the CAN chip is electrically connected to a first voltage source; and a working power supply terminal VS (V) of the CAN chip 421 is electrically connected to a second voltage source. Among them, the CAN chip 421 can be ATA6570H.

[0071] Optional, Figure 8 is a schematic diagram of the structure of another semi-active suspension control system provided by an embodiment of the present invention. Figure 8 As shown, the driving module 50 in the system includes a first IO unit 51 and a shock absorber driving unit 52; the main control module 10 is electrically connected to the shock absorber driving unit 52 through the first IO unit 51; in this way, the main control module 10 sends the current control instruction to the shock absorber driving unit 52 through the first IO unit 51 so that the shock absorber driving unit 52 drives the opening size of the electromagnetic valve in the shock absorber, thereby realizing the shock absorber damping adjustment and improving the vehicle's passability, smoothness and stability.

[0072] Optional, continue to refer to Figure 8 , the height adjustment switch detection module 60 includes a height adjustment switch detection unit 61 and a second IO unit 62; the height adjustment control module 70 includes a third IO unit 71 and a height adjustment control unit 72; the height adjustment switch detection unit 61 is connected to the main control module 10 through the second IO unit 62; the main control module 10 is connected to the height adjustment control unit 72 through the third IO unit 71. In this way, the height adjustment switch detection unit 61 detects different switch states output under the user's height adjustment command; and sends the different switch states to the main control module 10 through the second IO unit 62; the main control module 10 outputs the height control command to the height adjustment control unit through the third IO unit 71 so that it controls the airbag inflation size according to the height adjustment control command.

[0073] Optional, continue to refer to Figure 8 The height adjustment switch detection unit 61 includes: a level signal adjustment circuit 611 and a switch state output circuit 612; the switch state output circuit 612 is used to output different switch states when the level signal adjustment circuit outputs different level states. Among them, the level signal adjustment circuit 611 can output different level states, and the different level states can include grounding, disconnection and power supply level states. The switch state output circuit 612 can output different switch states in different level states; different switch states correspond to different height control instructions.

[0074] Optional, Fig. 9 is a specific circuit diagram of a height adjustment switch detection module provided by an embodiment of the present invention, such as Fig. 9 As shown, the level signal adjustment circuit 611 includes a first level signal adjustment circuit and a second level signal adjustment circuit; the switch state output circuit 612 includes a first switch state output circuit, a second switch state output circuit, a third switch state output circuit and a fourth switch state output circuit;

[0075] The first switch state output circuit includes a sixth transistor K6, a fourth pull-down resistor R24 ​​and a first current limiting resistor R1; the second switch state output circuit includes a seventh transistor K7, a fifth pull-down resistor R25 and a second current limiting resistor R2; the third switch state output circuit includes an eighth transistor K8, a sixth pull-down resistor R26 and a third current limiting resistor R3; the fourth switch state output circuit includes a ninth transistor K9, a seventh pull-down resistor R27 and a fourth current limiting resistor R4;

[0076] The control end of the sixth transistor K6 and the control end of the seventh transistor K7 receive the first level adjustment signal Hight-switch1; the first end of the sixth transistor K6 and the first end of the seventh transistor K7 are connected to the voltage source VCC (3.3V); the second end of the sixth transistor K6 is grounded through the fourth pull-down resistor R24; the second end of the sixth transistor K6 outputs the first switch state signal through the first current limiting resistor R1; the second end of the seventh transistor K7 is grounded through the fifth pull-down resistor R25; the second end of the seventh transistor K7 outputs the second switch state signal through the second current limiting resistor R2;

[0077] The control end of the eighth transistor K8 and the control end of the ninth transistor K9 receive the second level adjustment signal Hight-switch2; the first end of the eighth transistor K8 and the first end of the ninth transistor K9 are connected to the voltage source VCC (3.3V); the second end of the eighth transistor K8 is grounded through the sixth pull-down resistor R26; the second end of the eighth transistor K8 outputs the third switch state signal through the third current limiting resistor R3; the second end of the ninth transistor K9 is grounded through the seventh pull-down resistor R27; the second end of the ninth transistor K9 outputs the fourth switch state signal through the fourth current limiting resistor R4.

[0078] The specific principle of the height adjustment switch detection module 60 is as follows: when the first level adjustment signal Hight-switch1 received by the control end of the sixth transistor K6 and the control end of the seventh transistor K7 is at a high level, and at the same time, the second level adjustment signal Hight-switch2 received by the control end of the eighth transistor K8 and the control end of the ninth transistor K9 is at a high level, each transistor is in a closed state, and then each switch state signal is a low level signal, and the low level signal corresponds to the highest height; when the first level adjustment signal Hight-switch1 received by the control end of the sixth transistor K6 and the control end of the seventh transistor K7 is at a low level, and at the same time, the control end of the eighth transistor K8 and the control end of the ninth transistor K9 are at a high level, each transistor is in a closed state, and then each switch state signal is a low level signal, and the low level signal corresponds to the highest height; When the second level adjustment signal Hight-switch2 received by the control end of 9 is low level, each transistor is in the on state, then each switch state signal is a high level signal, and the corresponding height of the low level signal is the lowest position; when the first level adjustment signal Hight-switch1 received by the control end of the sixth transistor K6 and the control end of the seventh transistor K7 is suspended, and the second level adjustment signal Hight-switch2 received by the control end of the eighth transistor K8 and the control end of the ninth transistor K9 is suspended, each transistor control end is grounded, then each switch state signal is a low level signal, and the corresponding height of the low level signal is the middle position; in this way, different heights can be adjusted by using the combination of each switch state signal. Among them, each current limiting resistor plays a role of current limiting; each pull-down resistor plays a role in ensuring the normal operation of each transistor. Of course, in some embodiments, the first level signal adjustment circuit also includes a fifth current limiting resistor R5 and a sixth current limiting resistor R6; the fifth current limiting resistor R5 and the sixth current limiting resistor R6 play a role of current limiting; the second level signal adjustment circuit also includes a seventh current limiting resistor R7 and a seventh current limiting resistor R8. The seventh current limiting resistor R7 and the seventh current limiting resistor R8 play a role in current limiting.

[0079] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A semi-active suspension control system, characterized in that: include: A main control module and a signal output module, a signal detection module, a CAN module and a drive module electrically connected to the main control module; The signal output module is used to output an inductance response signal according to the inductance signal and the trigger inductance signal; the signal detection module is used to detect the acceleration signal of each axis on the semi-active suspension; the CAN module is used to read the vehicle motion parameters; The main control module is used to determine the height signal of each axle on the semi-active suspension according to the time of the inductance response signal, and output the current drive instruction according to the height signal, the acceleration signal and the vehicle motion parameter; the drive module is used to control the opening of the solenoid valve in the shock absorber according to the current drive instruction.

2. The semi-active suspension control system according to claim 1, characterized in that: Also includes: A height adjustment switch detection module and a height adjustment control module; the height adjustment switch detection module and the height adjustment control module are electrically connected to the main control module; The height adjustment switch detection module is used to detect different switch states output under the user's height adjustment command; the main control module is also used to receive and output height adjustment control commands to the height adjustment control module according to the different switch states; the height adjustment control module is used to control the airbag inflation size according to the height adjustment control command.

3. The semi-active suspension control system according to claim 1, characterized in that: The signal output module includes a signal output unit and a first ADC sampling unit; the signal output unit is electrically connected to the first ADC sampling unit; the first ADC sampling unit is electrically connected to the main control module; The signal output unit is used to output an inductance response analog signal according to the inductance signal and the trigger inductance signal; the first ADC sampling unit is used to convert the inductance response analog signal into an inductance response digital signal and output it to the main control module.

4. The semi-active suspension control system according to claim 3, characterized in that: The signal output unit includes a first inductance signal trigger unit, a second inductance signal trigger unit, a first inductance signal input unit, a second inductance signal input unit, an isolation unit and an inductance response signal output unit; The first inductance signal input unit is used to output a first inductance signal; The first inductance signal trigger unit is used to output a first inductance signal trigger signal so that the first inductance signal is sent to the inductance response signal output unit; The second inductance signal input unit is used to output a second inductance signal; The second inductance signal trigger unit is used to output a second inductance signal trigger signal so that the second inductance signal is sent to the inductance response signal output unit; The inductance response signal output unit is used to output an inductance response signal according to the first inductance signal, the second inductance signal and the negative voltage input protection signal; The isolation unit is used to isolate the first inductance signal from the second inductance signal.

5. The semi-active suspension control system according to claim 4, characterized in that: The first inductor signal input unit includes a first inductor, a first diode, a first transistor, a first pull-up resistor and a first pull-down resistor; the second inductor signal input unit includes a second inductor, a second diode, a second transistor, a second pull-up resistor and a second pull-down resistor; The first inductance signal trigger unit includes a first resistor and a third transistor; the second inductance signal trigger unit includes a second resistor and a fourth transistor; The isolation unit includes a first reverse diode, a second reverse diode, a third diode, a fourth diode, a fifth diode and a sixth diode; The inductance response signal output unit includes a comparator; The first end of the first inductor receives a first inductor signal; the first end of the first inductor is electrically connected to the first end of the first reverse diode; The first end of the second inductor receives a second inductor signal; the first end of the second inductor is electrically connected to the first end of the second reverse diode; the second end of the first reverse diode and the second end of the second reverse diode are both grounded, and the first end of the third diode is electrically connected to the first end of the fourth diode; The second end of the third diode is electrically connected to the first end of the fifth diode; the second end of the fifth diode is electrically connected to the second end of the first inductor and the first end of the first diode; the second end of the first diode is electrically connected to the first end of the first transistor; the second end of the first transistor is electrically connected to the first end of the first pull-up resistor; the second end of the first pull-up resistor is electrically connected to the control end of the first transistor and the first end of the first pull-down resistor; The second end of the first pull-down resistor is electrically connected to the first end of the third triode; the second end of the third triode is electrically connected to the first end of the fourth triode and both are grounded; the second end of the fourth triode is electrically connected to the first end of the second pull-down resistor; the second end of the second pull-down resistor is electrically connected to the first end of the second pull-up resistor and the control end of the second triode; The second end of the fourth diode is electrically connected to the first end of the sixth diode; the second end of the sixth diode is electrically connected to the second end of the second inductor and the first end of the second diode; the second end of the second diode is electrically connected to the first end of the second transistor; the second end of the second transistor is electrically connected to the first end of the second pull-up resistor and the second end of the first transistor; the second end of the second transistor is also electrically connected to the first input end of the comparator; the second input end of the comparator is electrically connected to the negative voltage input protection circuit; the output end of the comparator outputs the inductance response signal; The control end of the third transistor receives a first inductance signal trigger signal; the control end of the fourth transistor receives a second inductance signal trigger signal.

6. The semi-active suspension control system according to claim 5, characterized in that: The negative voltage input protection circuit includes a fifth transistor, a constant voltage source, a third pull-up resistor and a third pull-down resistor; The first end of the fifth transistor is electrically connected to the second input end of the comparator; the second end of the fifth transistor is electrically connected to the ground end of the main control module through the third pull-down resistor; and the control end of the fifth transistor is electrically connected to the ground end of the main control module through the third pull-up resistor.

7. The semi-active suspension control system according to claim 1, characterized in that: The signal detection module includes an accelerator signal detection unit and a second ADC sampling unit; the accelerator signal detection unit and the second ADC sampling unit are electrically connected; the second ADC sampling unit is electrically connected to the main control module; The accelerator signal detection unit is used to detect the acceleration analog signal of each axis on the semi-active suspension; the second ADC sampling unit is used to convert the acceleration analog signal into an acceleration digital signal and output it to the main control module.

8. The semi-active suspension control system according to claim 7, characterized in that: The accelerator signal detection unit includes: an acceleration signal detection control chip and an acceleration signal sensor; The main control module is electrically connected to the SPI pin of the acceleration signal detection control chip; the PSI5 pin of the acceleration signal detection control chip is electrically connected to the accelerator signal sensor; and the accelerator signal sensor is electrically connected to the main control module through the second ADC sampling unit.

9. The semi-active suspension control system according to claim 1, characterized in that: The CAN module includes a CAN transceiver and a CAN controller; the CAN transceiver is electrically connected to the CAN controller; the CAN controller is electrically connected to the main control module; the CAN controller is used to read the vehicle motion parameters through the CAN transceiver and send the vehicle motion parameters to the main control module.

10. The semi-active suspension control system according to claim 9, characterized in that: The CAN controller comprises: a CAN chip; The wake-up end of the CAN chip and the signal end of the CAN chip are electrically connected to the CAN transceiver; the power supply end of the CAN chip is electrically connected to the voltage circuit; the signal power supply end of the CAN chip is electrically connected to the first voltage source; and the working power supply end of the CAN chip is electrically connected to the second voltage source.

11. The semi-active suspension control system according to claim 1, characterized in that: The driving module includes a first IO unit and a shock absorber driving unit; the main control module is electrically connected to the shock absorber driving unit through the first IO unit.

12. The semi-active suspension control system according to claim 2, characterized in that: The height adjustment switch detection module includes a height adjustment switch detection unit and a second IO unit; the height adjustment control module includes a third IO unit and a height adjustment control unit; The height adjustment switch detection unit is connected to the main control module through the second IO unit; The main control module is connected to the height adjustment control unit through the third IO unit.

13. The semi-active suspension control system according to claim 12, characterized in that: The height adjustment switch detection unit includes: a level signal adjustment circuit and a switch state output circuit; the switch state output circuit is used to output different switch states when the level signal adjustment circuit outputs different level states.

14. The semi-active suspension control system according to claim 13, characterized in that: The level signal adjustment circuit includes a first level signal adjustment circuit and a second level signal adjustment circuit; the switch state output circuit includes a first switch state output circuit, a second switch state output circuit, a third switch state output circuit and a fourth switch state output circuit; The first switch state output circuit includes a sixth transistor, a fourth pull-down resistor and a first current limiting resistor; The second switch state output circuit includes a seventh transistor, a fifth pull-down resistor and a second current limiting resistor; The third switch state output circuit includes an eighth transistor, a sixth pull-down resistor and a third current limiting resistor; The fourth switch state output circuit includes a ninth transistor, a seventh pull-down resistor and a fourth current limiting resistor; The control end of the sixth transistor and the control end of the seventh transistor receive a first level adjustment signal; the first end of the sixth transistor and the first end of the seventh transistor are connected to a voltage source; the second end of the sixth transistor is grounded through the fourth pull-down resistor; the second end of the sixth transistor outputs a first switch state signal through the first current limiting resistor; the second end of the seventh transistor is grounded through the fifth pull-down resistor; the second end of the seventh transistor outputs a second switch state signal through the second current limiting resistor; The control end of the eighth transistor and the control end of the ninth transistor receive a second level adjustment signal; the first end of the eighth transistor and the first end of the ninth transistor are connected to a voltage source; the second end of the eighth transistor is grounded through the sixth pull-down resistor; the second end of the eighth transistor outputs a third switch state signal through the third current limiting resistor; the second end of the ninth transistor is grounded through the seventh pull-down resistor; the second end of the ninth transistor outputs a fourth switch state signal through the fourth current limiting resistor.

15. The semi-active suspension control system according to claim 2, characterized in that: The height adjustment control module includes an airbag driving circuit.

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