Control circuit and vehicle

Abstract

The utility model relates to a control circuit and a vehicle. The control circuit comprises a buck-boost conversion unit, a sampling unit and a control unit. The output end of the sampling unit is electrically connected with the input end of the control unit, the output end of the control unit is electrically connected with the first control end of the buck-boost conversion unit, and the second control end of an electromagnetic valve in the suspension system is electrically connected between the input end of the sampling unit and the output end of the buck-boost conversion unit; the sampling unit is used for outputting sampling voltage to the control unit based on sampling current of the second control end, and the control unit is used for controlling the buck-boost conversion unit to increase or decrease voltage output to the second control end based on the sampling voltage. Based on the scheme, the problem of electromagnetic compatibility is avoided, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control circuit and a vehicle. Background Art

[0002] In order to have a more comfortable riding experience, many vehicles are equipped with more intelligent air suspension systems. For the current control of the suspension multi-cavity solenoid valve, the existing technical solution generally adopts the solution of pre-drive control NMOS output PWM control current. However, this solution requires high-frequency drive of PWM signal, which has electromagnetic compatibility problems. In addition, the high-frequency drive capacity of the pre-drive is limited. If the ideal control effect is required, multiple pre-drives need to be used, which increases the cost of use. Utility Model Content

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a control circuit and a vehicle.

[0004] In a first aspect, the present application provides a control circuit, comprising:

[0005] Buck-boost conversion unit, sampling unit and control unit;

[0006] The output end of the sampling unit is electrically connected to the input end of the control unit, the output end of the control unit is electrically connected to the first control end of the buck-boost conversion unit, and the second control end of the solenoid valve in the suspension system is electrically connected between the input end of the sampling unit and the output end of the buck-boost conversion unit;

[0007] The sampling unit is used to output a sampling voltage to the control unit based on the sampling current of the second control terminal, and the control unit is used to control the buck-boost conversion unit to increase or decrease the voltage output to the second control terminal based on the sampling voltage.

[0008] Optionally, the control unit comprises a first amplifier;

[0009] The first input end of the first amplifier is electrically connected to the output end of the sampling unit, the second input end of the first amplifier is electrically connected to the reference voltage end, and the output end of the first amplifier is electrically connected to the first control end of the buck-boost conversion unit.

[0010] Optionally, the sampling unit includes a second amplifier and a first resistor;

[0011] A first end of the first resistor is electrically connected to the output end of the control end, and a second end of the first resistor is electrically connected to a first fixed level;

[0012] The first input terminal of the second amplifier is electrically connected between the first terminal of the first resistor and the output terminal of the control terminal, and the second input terminal of the second amplifier is electrically connected between the second terminal of the first resistor and the first fixed level terminal.

[0013] Optionally, it also includes a filtering unit;

[0014] The filtering unit is electrically connected between the output end of the sampling unit and the input end of the control unit.

[0015] Optionally, a second resistor is also included;

[0016] The second resistor is electrically connected between the first control terminal and an output terminal of the control unit.

[0017] Optionally, a third resistor and a fourth resistor are further included;

[0018] The first end of the third resistor is electrically connected between the output end of the buck-boost conversion unit and the second control end, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to a second fixed level, and the second end of the second resistor and the first end of the third resistor are both electrically connected between the second resistor and the first control end.

[0019] Optionally, the second control terminal includes a first inductor.

[0020] Optionally, it further includes a first diode;

[0021] The cathode of the first diode is electrically connected between the output end of the buck-boost conversion unit and the second control end.

[0022] Optionally, the buck-boost conversion unit includes a DC-DC conversion circuit.

[0023] In a second aspect, the present application further provides a vehicle, comprising the suspension system and a control circuit as described in any one of the first aspects.

[0024] The present application provides a control circuit and a vehicle, the control circuit includes a buck-boost conversion unit, a sampling unit and a control unit; the output end of the sampling unit is electrically connected to the input end of the control unit, the output end of the control unit is electrically connected to the first control end of the buck-boost conversion unit, and the second control end of the electromagnetic valve in the suspension system is electrically connected between the input end of the sampling unit and the output end of the buck-boost conversion unit; the sampling unit is used to output a sampling voltage to the control unit based on the sampling current of the second control end, and the control unit is used to control the buck-boost conversion unit to increase or decrease the voltage output to the second control end based on the sampling voltage. Based on the above scheme, the present application is different from the PWM high-frequency pre-drive method used in the prior art, and instead uses the buck-boost conversion unit to output a control voltage to the second control end of the electromagnetic valve in the suspension system. The sampling circuit can obtain the sampling current flowing through the second control end in real time and convert it into a sampling voltage. The control unit can control the buck-boost conversion unit to increase or decrease the voltage output to the second control end based on the sampling voltage. After receiving a specific voltage, the second control end can make specific control on the suspension system to ensure the control effect of the suspension system. The present application controls the current flowing through the second control end of the solenoid valve by controlling the output voltage of the buck-boost conversion unit. This is different from using PWM to control the current, avoiding electromagnetic compatibility issues, and no longer requiring the use of multiple pre-drivers, which reduces costs. In addition, the present application uses current sampling at the output end of the second control end. Compared with sampling at the output end of the buck-boost conversion unit, the voltage is lower, so the requirements for devices are lower, which is conducive to reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a control circuit structure provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of another control circuit structure provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of another control circuit structure provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of another control circuit structure provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of another control circuit structure provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of another control circuit structure provided in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of another control circuit structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0034] Figure 1 A schematic diagram of a control circuit structure provided in an embodiment of the present application includes:

[0035] The buck-boost conversion unit 100 , the sampling unit 200 and the control unit 300 .

[0036] The output end of the sampling unit 200 is electrically connected to the input end of the control unit 300, the output end of the control unit 300 is electrically connected to the first control end of the buck-boost conversion unit 100, and the second control end 400 of the solenoid valve in the suspension system is electrically connected between the input end of the sampling unit 200 and the output end of the buck-boost conversion unit 100.

[0037] The sampling unit 200 is used to output a sampling voltage to the control unit 300 based on the sampling current of the second control terminal 400 . The control unit 300 is used to control the buck-boost conversion unit 100 to increase or decrease the voltage output to the second control terminal 400 based on the sampling voltage.

[0038] Specifically, the suspension system is a force transmission connection device between the vehicle frame and the axle or wheel in the vehicle. Its function is to transmit the force and torque acting between the wheel and the frame, and to buffer the impact force transmitted to the frame or body by the uneven road surface, and to attenuate the vibration caused thereby, so as to ensure the smooth driving of the vehicle. During the operation of the suspension system, the solenoid valve controls the relevant components, and the solenoid valve controls the relevant components based on the magnitude of the received voltage (or the current flowing through it).

[0039] In the embodiment of the present application, the buck-boost conversion unit 100 represents a functional element capable of converting the magnitude of voltage and / or the nature of current, such as converting a DC high voltage into a DC low voltage, or converting an AC low voltage into a DC low voltage, etc. In some embodiments, the buck-boost conversion unit 100 may be a DC-DC conversion circuit.

[0040] The sampling unit 200 represents a functional element capable of sampling the current flowing through the second control terminal 400 and converting the current into a voltage to transmit to the control unit 300 .

[0041] The control unit 300 represents a functional element that can determine whether the current buck-boost conversion circuit accurately outputs the voltage based on the sampled voltage. When the output voltage of the buck-boost conversion unit 100 is higher than the ideal voltage of the second control terminal 400, the control signal is output to the first control terminal to control the buck-boost conversion unit 100 to reduce the output voltage. When the output voltage of the buck-boost conversion unit 100 is lower than the ideal voltage of the second control terminal 400, the control signal is output to the first control terminal to control the buck-boost conversion unit 100 to increase the output voltage, so that the voltage output by the buck-boost conversion unit 100 to the second control terminal 400 is equal to the ideal voltage required by the second control terminal 400.

[0042] In summary, based on the above scheme, the embodiment of the present application is different from the PWM high-frequency pre-drive method in the prior art, and instead uses the buck-boost conversion unit 100 to output a control voltage to the second control terminal 400 of the electromagnetic generator in the suspension system. The sampling circuit can obtain the sampling current flowing through the second control terminal 400 in real time and convert it into a sampling voltage. The control unit 300 can control the buck-boost conversion unit 100 based on the sampling voltage to increase or decrease the voltage output to the second control terminal 400. After receiving a specific voltage, the second control terminal 400 can make specific control of the suspension system to ensure the control effect of the suspension system. The embodiment of the present application controls the current flowing through the second control terminal 400 of the electromagnetic valve by controlling the output voltage of the buck-boost conversion unit 100. Different from using PWM to control the current, it avoids the problem of electromagnetic compatibility, no longer needs to use multiple pre-drives, and reduces the cost. In addition, the embodiment of the present application adopts current sampling at the output end of the second control terminal 400. Compared with sampling at the output end of the buck-boost conversion unit 100, the voltage is lower, so the requirements for the device are lower, and the cost is reduced.

[0043] Figure 2 This is another schematic diagram of a control circuit structure provided by an embodiment of the present application. In some embodiments, the control unit 300 includes a first amplifier.

[0044] The first input terminal of the first amplifier is electrically connected to the output terminal of the sampling unit 200 , the second input terminal of the first amplifier is electrically connected to the reference voltage terminal, and the output terminal of the first amplifier is electrically connected to the first control terminal of the buck-boost conversion unit 100 .

[0045] Specifically, the reference voltage terminal outputs a reference voltage Vref to the second input terminal, and the reference voltage Vref corresponds to the ideal current flowing through the second control terminal 400. The first amplifier can compare the sampled voltage with the reference voltage Vref, and if the sampled voltage is not equal to the reference voltage Vref, the first amplifier adjusts the output control signal to control the buck-boost conversion unit 100 to adjust the output voltage, so that the current flowing through the second control terminal 400 is equal to the ideal current of the second control terminal 400 again.

[0046] Based on the above structure, the buck-boost conversion unit 100 can be accurately controlled.

[0047] Figure 3 A schematic diagram of another control circuit structure provided in an embodiment of the present application is shown in FIG.

[0048] A first end of the first resistor 202 is electrically connected to the output end of the control end, and a second end of the first resistor 202 is electrically connected to the first fixed level.

[0049] The first input terminal of the second amplifier 201 is electrically connected between the first terminal of the first resistor 202 and the output terminal of the control terminal, and the second input terminal of the second amplifier 201 is electrically connected between the second terminal of the first resistor 202 and the first fixed level terminal.

[0050] like Figure 3 As shown, the first resistor 202 is a sampling resistor, and together with the second amplifier 201 forms a current sampling circuit. The current flowing through the second control terminal 400 is collected by the first resistor 202 and converted into a sampling voltage and transmitted to the first amplifier.

[0051] Based on the above structure, the sampling voltage can be accurately collected.

[0052] Figure 4 This is another schematic diagram of a control circuit structure provided by an embodiment of the present application. In some embodiments, a filter unit 500 is further included.

[0053] The filter unit 500 is electrically connected between the output terminal of the sampling unit 200 and the input terminal of the control unit 300 .

[0054] Specifically, the filtering unit 500 may include a fifth resistor 501 and a first capacitor 502, and the connection relationship between them is as follows: Figure 4 Through the function of the filtering unit 500, the stray signal interference in the sampled voltage outputted by the sampling unit 200 to the control unit 300 can be filtered out, thereby improving the accuracy of the sampled voltage.

[0055] Figure 5 This is another schematic diagram of a control circuit structure provided by an embodiment of the present application. In some embodiments, a second resistor 601 is further included.

[0056] The second resistor 601 is electrically connected between the first control terminal and the output terminal of the control unit 300 .

[0057] Continue reading Figure 5 In some embodiments, a third resistor 602 and a fourth resistor 603 are also included.

[0058] The first end of the third resistor 602 is electrically connected between the output end of the buck-boost conversion unit 100 and the second control end 400, the second end of the third resistor 602 is electrically connected to the first end of the fourth resistor 603, the second end of the fourth resistor 603 is electrically connected to the second fixed level, and the second end of the second resistor 601 and the first end of the third resistor 602 are both electrically connected between the second resistor 601 and the first control end.

[0059] Specifically, the second resistor 601 can be used to divide the output voltage of the control unit 300 so that the voltage input to the first control terminal reaches the voltage size that it can receive. The third resistor 602 and the fourth resistor 603 are similar to the second resistor 601. The third resistor 602 and the fourth resistor 603 can divide the voltage output by the buck-boost conversion unit 100 and transmit it to the first control terminal. In some embodiments, the second resistor 601, the third resistor 602 and the fourth resistor 603 jointly play a role in dividing the voltage, so that the voltage transmitted to the first control terminal is less than the maximum voltage that the first control terminal can receive.

[0060] Figure 6 Another control circuit structure diagram provided by the embodiment of the present application. In some embodiments, the second control terminal 400 includes a first inductor. In some embodiments, a first diode 604 is also included.

[0061] The cathode of the first diode 604 is electrically connected between the output terminal of the buck-boost converter unit 100 and the second control terminal 400 .

[0062] like Figure 6 As shown, during the operation of the first inductor, current flows through the first inductor. If the buck-boost conversion unit 100 is suddenly powered off, a large amount of charge will accumulate in the first inductor, which may damage some components, because the first inductor is an inductive element. Through the action of the first diode 604, after the buck-boost conversion unit 100 is powered off, the first inductor can continue to form a complete loop, release the charge in the first inductor, and avoid damaging the components in the circuit.

[0063] In summary, the embodiments of the present application are Figures 1 to 6 The functions of various electronic components in the suspension system are achieved to control the solenoid valve in the suspension system. Moreover, each device is separated from each other, and various components can be flexibly replaced. Compared with integrated circuits, it has stronger changeability and a wide range of material selection.

[0064] An embodiment of the present application also provides a vehicle, the vehicle including a suspension system and a control circuit including any one of the control circuit embodiments described above. Figure 7 A schematic diagram of another control circuit structure provided in an embodiment of the present application, wherein the control circuit includes all the technical features of the above control circuit.

[0065] The vehicle provided in the embodiment of the present application includes the control circuit in the above-mentioned control circuit embodiment, and thus can achieve the same technical effect as the above-mentioned control circuit embodiment, which will not be repeated here.

[0066] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0067] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control circuit, characterized in that: include: Buck-boost conversion unit, sampling unit and control unit; The output end of the sampling unit is electrically connected to the input end of the control unit, the output end of the control unit is electrically connected to the first control end of the buck-boost conversion unit, and the second control end of the solenoid valve in the suspension system is electrically connected between the input end of the sampling unit and the output end of the buck-boost conversion unit; The sampling unit is used to output a sampling voltage to the control unit based on the sampling current of the second control terminal, and the control unit is used to control the buck-boost conversion unit to increase or decrease the voltage output to the second control terminal based on the sampling voltage.

2. The control circuit according to claim 1, characterized in that: The control unit includes a first amplifier; The first input end of the first amplifier is electrically connected to the output end of the sampling unit, the second input end of the first amplifier is electrically connected to the reference voltage end, and the output end of the first amplifier is electrically connected to the first control end of the buck-boost conversion unit.

3. The control circuit according to claim 1, characterized in that: The sampling unit includes a second amplifier and a first resistor; A first end of the first resistor is electrically connected to the output end of the control end, and a second end of the first resistor is electrically connected to a first fixed level; The first input terminal of the second amplifier is electrically connected between the first terminal of the first resistor and the output terminal of the control terminal, and the second input terminal of the second amplifier is electrically connected between the second terminal of the first resistor and the first fixed level terminal.

4. The control circuit according to claim 1, characterized in that: Also includes a filtering unit; The filtering unit is electrically connected between the output end of the sampling unit and the input end of the control unit.

5. The control circuit according to claim 1, characterized in that: Also comprising a second resistor; The second resistor is electrically connected between the first control terminal and an output terminal of the control unit.

6. The control circuit according to claim 5, characterized in that: Also comprising a third resistor and a fourth resistor; The first end of the third resistor is electrically connected between the output end of the buck-boost conversion unit and the second control end, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to a second fixed level, and the second end of the second resistor and the first end of the third resistor are both electrically connected between the second resistor and the first control end.

7. The control circuit according to claim 1, characterized in that: The second control terminal includes a first inductor.

8. The control circuit according to claim 7, characterized in that: Also included is a first diode; The cathode of the first diode is electrically connected between the output end of the buck-boost conversion unit and the second control end.

9. The control circuit according to claim 1, characterized in that: The buck-boost conversion unit includes a DC-DC conversion circuit.

10. A vehicle, characterized in that: The vehicle comprises the suspension system and the control circuit according to any one of claims 1-9.

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