Drive circuit, inductive position sensor, automotive electronic clutch and automobile

Abstract

The application discloses a driving circuit, an inductive position sensor, an automobile electronic clutch and an automobile. The circuit comprises a semiconductor field effect transistor H-bridge circuit arranged between an MCU controller and an inductive position sensor of an electromagnetic clutch, and a position sensor inductive coil. The MCU controller is used to generate a PWM signal and input the PWM signal into the semiconductor field effect transistor H-bridge circuit, and input a current into the position sensor inductive coil, so that the PWM signal is periodically cleared. The application can significantly improve the stability of the input current, thereby improving the position detection accuracy and response speed of the clutch.

Description

Technical Field

[0001] This application relates to the field of inductive position sensor technology, and more particularly to a drive circuit, an inductive position sensor, an automotive electronic clutch, and an automobile. Background Technology

[0002] The driving scheme of the position sensor may have unstable feedback current, which will lead to unstable clutch position values. Utility Model Content

[0003] This application provides a drive circuit, an inductive position sensor, an automotive electronic clutch, and an automobile. The drive circuit can significantly improve the stability of the input current, thereby increasing the position detection accuracy and response speed of the clutch.

[0004] The embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, embodiments of this application provide a driving circuit, wherein the circuit includes: a semiconductor field-effect transistor H-bridge circuit disposed between an MCU controller and an inductive position sensor of an electromagnetic clutch, and a position sensor inductor coil. The MCU controller is used to generate a PWM signal and input it to the semiconductor field-effect transistor H-bridge circuit, and input current to the position sensor inductor coil to periodically clear the PWM signal to zero.

[0006] In some embodiments, a current sampling resistor circuit is also included for use in order to

[0007] Sample pulse current signal.

[0008] In some embodiments, the MCU controller is used to

[0009] The engagement position information of the electromagnetic clutch is determined based on the magnitude of the current value in the pulse current signal.

[0010] In some embodiments, the clutch inductance value in the inductive position sensor is determined based on the inductance of the magnetic device itself and the clutch engagement clearance.

[0011] In some embodiments, the semiconductor field-effect transistor H-bridge circuit includes at least four MOSFET devices: Q1, Q2, Q3, and Q4.

[0012] In some embodiments, the MCU controller is further configured to...

[0013] When the first PWM signal is high or low, Q1 and Q4 are turned on, Q2 and Q3 are turned off, and voltage is injected into the inductor L1 through Q1 and Q4.

[0014] In some embodiments, the MCU controller is further configured to...

[0015] When the first PWM signal is low and the second PWM signal is high, Q1 and Q4 are turned off, and Q2 and Q3 are turned on. Current is fed back to the power supply through Q2 and Q3, causing the current to drop to zero.

[0016] Secondly, embodiments of this application also provide an inductive position sensor, wherein the inductive position sensor includes: a driving circuit as described in the first aspect.

[0017] Thirdly, embodiments of this application also provide an automotive electronic clutch, wherein the automotive electronic clutch includes an inductive position sensor as described in the second aspect.

[0018] Fourthly, embodiments of this application also provide an automobile, which includes: an electronic clutch as described in the third aspect.

[0019] The at least one technical solution adopted in this application embodiment can achieve the following beneficial effects: The drive circuit includes a semiconductor field-effect transistor H-bridge circuit and a position sensor inductor coil disposed between the MCU controller and the inductive position sensor of the electromagnetic clutch. Furthermore, the MCU controller generates a PWM signal and inputs it to the semiconductor field-effect transistor H-bridge circuit, and inputs current to the position sensor inductor coil to periodically clear the PWM signal. By using the H-bridge circuit to replace the original single switching circuit, the problem of unstable sampling signal of the electromagnetic clutch position signal is solved, further improving the accuracy and reliability of the electromagnetic clutch operation. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the internal structure of the driving circuit in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the driving circuit in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The commonly used inductive position detection drive circuit is a unipolar switching circuit. Although a freewheeling circuit is added, the current waveform of the inductor coil excitation pulse still cannot be reduced to zero in each cycle, resulting in unstable feedback current value. Therefore, the detected position signal has a large deviation.

[0025] To address the aforementioned shortcomings, this application provides a driving circuit that uses an H-bridge to periodically reset the excitation current pulse sequence. Simultaneously, a sampling resistor is used to detect the magnitude of the excitation current pulses, thereby accurately calculating the engagement position of the electromagnetic clutch.

[0026] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0027] This application provides a driving circuit 100, such as... Figure 1 The diagram shows the internal structure of the drive circuit in this embodiment of the application. The circuit includes a semiconductor field-effect transistor H-bridge circuit 1010 and a position sensor inductor coil 1011 disposed between the MCU controller 200 and the inductive position sensor 300 of the electromagnetic clutch. The MCU controller 200 generates a PWM signal and inputs it to the semiconductor field-effect transistor H-bridge circuit 1010, and inputs current to the position sensor inductor coil 1011 to periodically clear the PWM signal.

[0028] In new energy vehicles, electromagnetic clutches are primarily used to connect the electric motor and the transmission. The vehicle control unit (VCU) adjusts the motor's torque and speed based on the vehicle's torque and speed, ensuring that the speed and torque at both ends of the electronic clutch are consistent or nearly identical, guaranteeing successful engagement and disengagement. Typically, the engagement and disengagement of the electronic clutch rely on the full-bridge circuit in the controller to provide operating current. The engagement and disengagement states are determined by the position sensing coil in the clutch and the coil excitation signal and current feedback signal in the controller.

[0029] Specifically, the MCU controller is used to generate PWM signals and input them into the semiconductor field-effect transistor H-bridge circuit, and to input pulse excitation current to the inductive position sensor. The H-bridge is used to realize the periodic clearing of the excitation current pulse sequence.

[0030] like Figure 2 As shown, the excitation signal is a PWM signal issued by the MCU controller, which passes through an H-bridge circuit composed of four MOSFETs and inputs pulse excitation power to the inductive position sensor of the electromagnetic clutch.

[0031] As you can understand, PWM signal is short for Pulse Width Modulation signal, which is a digital encoding method that controls the level of an analog signal by adjusting the pulse width (duty cycle).

[0032] As you can understand, MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is an important semiconductor device that is widely used in analog and digital circuits.

[0033] In one embodiment of this application, a current sampling resistor circuit is also included for sampling pulse current signals.

[0034] like Figure 2 As shown, the current sampling resistor R1 is responsible for sampling the pulse current signal I_fb, and the MCU controller determines the clutch engagement position information based on the magnitude of the current value.

[0035] In one embodiment of this application, the MCU controller is used to determine the engagement position information of the electromagnetic clutch based on the magnitude of the current value in the pulse current signal.

[0036] The MCU controller uses a sampling resistor to detect the magnitude of the excitation current pulse, thereby accurately calculating the engagement position of the electromagnetic clutch.

[0037] In one embodiment of this application, the clutch inductance value in the inductive position sensor is determined based on the inductance of the magnetic device itself and the clutch engagement clearance.

[0038] The clutch inductance value in the inductive position sensor is determined by the inductance of the magnetic device itself and the clutch engagement clearance. Here, the clearance is equivalent to the air pressure in the magnetic device; the greater the air pressure, the greater the magnetic resistance, and the smaller the inductance value.

[0039] It should be noted that inductance includes, but is not limited to, the permeability of magnetic devices, the number of turns of coils, cross-sectional area, etc., and is not specifically limited in the embodiments of this application.

[0040] In one embodiment of this application, the semiconductor field-effect transistor H-bridge circuit includes at least four MOSFET devices: Q1, Q2, Q3, and Q4.

[0041] like Figure 2 As shown, the drive circuit for the electronic clutch inductive position sensor includes MOSFETs Q1, Q2, Q3, and Q4. The position sensor inductor coil is L1.

[0042] In one embodiment of this application, the MCU controller is further configured to turn on Q1 and Q4, turn off Q2 and Q3, and inject current into the inductor L1 through Q1 and Q4 when the first PWM signal is high or low.

[0043] When entering the first half of the cycle, when PWM1 is high and PWM2 is low, Q1 and Q4 are turned on, and Q2 and Q3 are turned off. Voltage injects current into the inductor coil through Q1 and Q4.

[0044] In one embodiment of this application, the MCU controller is further configured to turn off Q1 and Q4 and turn on Q2 and Q3 when the first PWM signal is low and the second PWM signal is high, so that the current is fed back to the power supply through Q2 and Q3, thereby reducing the current to zero.

[0045] When entering the second half of the cycle, PWM1 is low and PWM2 is high. Q1 and Q4 are off and Q2 and Q3 are on. Since the current in coil L1 remains in the same direction, the current is fed back to the power supply through Q2 and Q3. Since the current direction is opposite to the voltage polarity, the current can be quickly reduced to 0.

[0046] This application embodiment also provides an inductive position sensor, wherein the inductive position sensor includes: the aforementioned driving circuit,

[0047] The circuit includes: a semiconductor field-effect transistor H-bridge circuit disposed between the MCU controller and the inductive position sensor of the electromagnetic clutch, and a position sensor inductor coil. The MCU controller is used to generate a PWM signal and input it to the semiconductor field-effect transistor H-bridge circuit, and input current to the position sensor inductor coil to periodically clear the PWM signal to zero.

[0048] In some embodiments, a current sampling resistor circuit is also included for use in order to

[0049] Sample pulse current signal.

[0050] In some embodiments, the MCU controller is used to

[0051] The engagement position information of the electromagnetic clutch is determined based on the magnitude of the current value in the pulse current signal.

[0052] In some embodiments, the clutch inductance value in the inductive position sensor is determined based on the inductance of the magnetic device itself and the clutch engagement clearance.

[0053] In some embodiments, the semiconductor field-effect transistor H-bridge circuit includes at least four MOSFET devices: Q1, Q2, Q3, and Q4.

[0054] In some embodiments, the MCU controller is further configured to...

[0055] When the first PWM signal is high or low, Q1 and Q4 are turned on, Q2 and Q3 are turned off, and voltage is injected into the inductor L1 through Q1 and Q4.

[0056] In some embodiments, the MCU controller is further configured to...

[0057] When the first PWM signal is low and the second PWM signal is high, Q1 and Q4 are turned off, and Q2 and Q3 are turned on. Current is fed back to the power supply through Q2 and Q3, causing the current to drop to zero.

[0058] This application also provides an automotive electronic clutch, wherein the automotive electronic clutch includes: the aforementioned inductive position sensor.

[0059] This application also provides a vehicle, which includes: the aforementioned vehicle electronic clutch.

[0060] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A driving circuit, wherein, The circuit includes: a semiconductor field-effect transistor H-bridge circuit disposed between the MCU controller and the inductive position sensor of the electromagnetic clutch, and a position sensor inductor coil. The MCU controller is used to generate a PWM signal and input it to the semiconductor field-effect transistor H-bridge circuit, and input current to the position sensor inductor coil to periodically clear the PWM signal to zero.

2. The circuit as described in claim 1, wherein, It also includes a current sampling resistor circuit, used to... Sample pulse current signal.

3. The circuit as described in claim 2, wherein, The MCU controller is used to The engagement position information of the electromagnetic clutch is determined based on the magnitude of the current value in the pulse current signal.

4. The circuit as described in claim 1, wherein, The clutch inductance value in the inductive position sensor is determined based on the inductance of the magnetic device itself and the clutch engagement clearance.

5. The circuit as described in claim 1, wherein, The semiconductor field-effect transistor H-bridge circuit includes at least four MOSFET devices: Q1, Q2, Q3, and Q4.

6. The circuit as described in claim 5, wherein, The MCU controller is also used for When the first PWM signal is high or low, Q1 and Q4 are turned on, Q2 and Q3 are turned off, and voltage is injected into the inductor L1 through Q1 and Q4.

7. The circuit as described in claim 5, wherein, The MCU controller is also used for When the first PWM signal is low and the second PWM signal is high, Q1 and Q4 are turned off, and Q2 and Q3 are turned on. Current is fed back to the power supply through Q2 and Q3, causing the current to drop to zero.

8. An inductive position sensor, wherein, The inductive position sensor includes: a driving circuit as described in any one of claims 1 to 7.

9. An electronic clutch for automobiles, wherein, The automotive electronic clutch includes: the inductive position sensor as described in claim 8.

10. A type of automobile, wherein, include: The automotive electronic clutch as described in claim 9.

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