Multi-way valve execution control circuit for new energy vehicle

Abstract

The utility model discloses a multi-way valve execution control circuit for a new energy vehicle, which relates to the field of circuits and comprises an MCU (Microprogrammed Control Unit) controller, an interface communication circuit connected with the MCU controller, a magnetic control angle control circuit, a motor driving circuit and a temperature detection circuit, the Hall sensor is arranged on the driving motor and used for collecting the rotation angle of the magnetic control multi-way valve; the power supply circuit is connected with an external power supply and provides working voltage for the MCU controller. The interface communication circuit receives external serial port input and inputs a bus control signal to the MCU controller; the magnetic control angle control circuit is connected with the driving motor, collects the rotation angle of the magnetic control multi-way valve, determines the magnetic control rotation angle through the MCU controller, and outputs a digital PWM signal. And the motor driving circuit controls the driving motor to rotate by a target angle according to the digital PWM signal. According to the scheme, control over the rotation angle of the multi-way valve is more accurate, digital PWM signals are detected, and the anti-interference capacity is higher.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of circuits, and in particular to a multi-way valve execution control circuit for new energy vehicles. Background Art

[0002] The multi-way valve of the thermal management system of new energy vehicles uses a motor to drive and control the opening and closing of each valve to achieve different hot and cold modes of the thermal management system. The multi-way valve includes a variety of valve core structures such as three-way valves and five-way valves. The multi-way valve is equipped with a rotating plug, which can control the opening and closing of the channel by changing the angle. When there are more valve passages, the motor needs to have higher control accuracy on the rotating plug to achieve more thermal management modes.

[0003] In the related technology, the rotation angle of the multi-way valve is mainly detected and identified by the ring-type carbon film potentiometer. Due to the low precision, limited detection range and poor consistency of the carbon film potentiometer, it is impossible to achieve precise control and can only meet the application requirements of 3-4-way valves, and cannot meet the increasingly complex thermal management system (maximum demand for 8-way valves). At the same time, the detection result is an analog quantity, which is easily disturbed during the transmission process, and the system stability is poor. Utility Model Content

[0004] An embodiment of the present application provides a multi-way valve execution control circuit for new energy vehicles, which solves the problem of inaccurate detection and identification of the rotation angle of the multi-way valve using a ring-shaped carbon film potentiometer.

[0005] The multi-way valve execution control circuit for new energy vehicles includes an MCU controller, an interface communication circuit connected to the MCU controller, a magnetic control angle control circuit including a magnetic angle sensor chip, and a motor drive circuit voltage detection circuit; wherein the Hall sensor is arranged on the drive motor to collect the rotation angle of the magnetic control multi-way valve;

[0006] The interface communication circuit receives external serial port input and inputs bus control signals to the MCU controller; the voltage detection circuit detects the voltage of the input external power supply and inputs it to the MCU controller;

[0007] The magnetic control angle control circuit is connected to the drive motor, collects the rotation angle of the magnetic control multi-way valve, determines the magnetic control rotation angle through the MCU controller and outputs a digital PWM signal; the motor drive circuit controls the drive motor to rotate to a target angle according to the digital PWM signal.

[0008] Specifically, the magnetically controlled angle control circuit includes a magnetic angle sensor chip, the VDD pin of the magnetic angle sensor chip is connected to the input power supply through the current limiting resistor R10, and both ends of R10 are grounded through capacitors C13 and C14 respectively; the CN / T0 pin and the SCK pin are connected to the ground ends of the capacitors C13 and C14; the VSS and SDAT / T2 pins are grounded, and the sampling input circuit is connected between the SWO / T1 and OUT pins.

[0009] Specifically, the sampling input circuit includes resistors R11, R12 and R17, capacitors C15, C16 and C19; the SWO / T1 pin is connected in cascade with resistor R17 and capacitor C19 in sequence, the OUT pin is connected to one end of the resistor R11, the other end of the resistor R11 is connected to capacitor C16 and pull-up resistor R12, and the Hall input signal is derived, and the Hall input signal is connected to the MCU controller; the pull-up resistor R12 is connected to the input power supply;

[0010] The OUT pin is also externally connected to a capacitor C15, and capacitors C15, C16 and C19 are commonly grounded.

[0011] Specifically, the interface communication circuit includes a LIN bus interface chip, the VBAT pin of the LIN bus interface chip is connected to one end of a capacitor C9, and the other end of C9 and a GND pin are grounded together; the LIN pin passes through one end of a resistor R5, and the other end is an interface signal input end; an external power supply VCC is connected to a diode D, and the output of the diode D is connected to the VBAT pin;

[0012] The TXD and RXD pins of the LIN bus interface chip are respectively connected to the MCU controller for receiving and sending control signals; a resistor R6 is connected between the VCC pin and the RSTN pin, and an external power supply is connected to the VCC pin. The end connected to the resistor R6 is also connected to one end of the capacitor C10 in turn, and the other end of the capacitor C10 is grounded.

[0013] Specifically, the IN1 and IN2 pins of the motor driving chip in the motor driving circuit are connected to the MCU controller to receive the digital PWM signal of the MCU controller; a capacitor C8 and a transient suppression diode are connected in parallel between the OUT1 and OUT2 pins, and terminals are drawn out at both ends of the transient suppression diode to connect the driving motor.

[0014] Specifically, the VCC pin of the motor drive circuit is connected to the external power supply VCC, the VCC pin is externally connected to one end of two parallel capacitors C6 and C7, and the other ends of the capacitors C6 and C7 are connected to the PAD pin and grounded;

[0015] The CS pin of the motor drive circuit leads to a current detection signal end, which is connected to the MCU controller; the CS pin is also externally connected to one end of a resistor R3, the other end of the resistor R3 is connected to the PAD pin, and a capacitor C20 is connected in parallel at both ends of the resistor R3.

[0016] Specifically, the voltage detection circuit draws an input end from an external power supply VCC, cascades resistors R13 and R14 in sequence, and is grounded through resistor R14; a Schottky diode Z2 and a capacitor C17 are connected in parallel at both ends of resistor R14, and a voltage detection signal end is drawn out at the output of resistor R13, and the voltage detection signal end is connected to the MCU controller.

[0017] Specifically, the voltage end of the temperature detection circuit is connected to one end of the resistor R15, the other output end of the resistor R15 is respectively connected to one end of the NTC thermistor and one end of the resistor R6, the other end of the NTC thermistor is output to ground, the other output end of the resistor R16 is connected to one end of the capacitor C18, and the other end of the capacitor C18 is output to ground; a temperature detection signal end is led out between the resistor R16 and the capacitor C18, and the temperature detection signal end is connected to the MCU control chip.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least: the present application replaces the annular carbon film potentiometer in the traditional multi-way valve with a Hall sensor, and the Hall sensor is used to collect, detect and control the rotation angle of the multi-way valve. The voltage detection circuit can safely monitor VCC to ensure the stability of the circuit; the interface communication circuit is used to change the working mode of the thermal management system of the new energy vehicle, and the magnetic control angle control circuit detects the rotation angle in real time. The MCU controller determines the output digital PWM signal, which is driven after encoding by the motor drive circuit to achieve high-precision magnetic control. The detection range can reach 1 degree wide, and the full range detection from 0 to 360 degrees can be achieved. The detection result is a digital PWM signal with strong anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a multi-way valve execution control circuit for new energy vehicles provided in an embodiment of the present application;

[0020] Figure 2 is a circuit diagram of a magnetic control angle control circuit provided in an embodiment of the present application;

[0021] Figure 3 is a circuit schematic diagram of an interface communication circuit;

[0022] Figure 4 It is a circuit structure diagram of the motor drive circuit;

[0023] Figure 5 This is the connection diagram of the MCU controller chip;

[0024] Figure 6 is a schematic diagram of the structure of a voltage detection circuit provided in an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of the structure of the temperature detection circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0027] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0028] Figure 1 It is a circuit structure diagram of the multi-way valve execution control circuit for new energy vehicles provided in the embodiment of the present application; the system includes an MCU controller, a power supply circuit, an interface communication circuit, a magnetic control angle control circuit and a motor drive circuit. The power supply circuit, the interface communication circuit, the magnetic control angle control circuit and the motor drive circuit are respectively connected to the MCU controller. The system still uses a Hall sensor, which is arranged on the drive motor to collect the rotation angle of the magnetic control multi-way valve in real time. The purpose of the drive motor control is also to control the rotation angle of the multi-way valve and achieve precise control. The magnetic control angle control circuit includes a magnetic angle sensor chip, which is specifically used to process the collected data of the Hall sensor. It collects the rotation angle of the magnetic control multi-way valve, determines the magnetic control rotation angle through the MCU controller and outputs a digital PWM signal. The motor drive circuit controls the target angle of rotation of the drive motor according to the digital PWM signal. The power supply circuit is connected to an external power supply, mainly for voltage conversion, to provide a normal working voltage to the MCU controller. The interface communication circuit receives external serial port input and inputs bus control signals to the MCU controller, such as controlling the magnetic control angle according to the external input, that is, changing the different hot and cold modes of the thermal management system, which is manifested as specific control logic and control mode for the magnetic control angle.

[0029] Figure 2 This is a circuit diagram of the magnetically controlled angle control circuit provided in an embodiment of the present application. The magnetically controlled angle control circuit includes a magnetic angle sensor chip U4 (MIT6501). The chip is implemented based on the magnetic detection principle of the Hall sensor, replacing the original ring-type carbon film potentiometer detection principle. The magnetic control method has higher detection accuracy and can be well applied to multi-way valves. Figure 2In the embodiment, the input power supply is a +5V power supply, and the +5V power supply is connected to the current limiting resistor R10 and connected to the VDD pin of U4. The two ends of the resistor R10 are grounded through capacitors C13 and C14 respectively. The CN / T0 pin and the SCK pin are connected to the ground terminals of capacitors C13 and C14. The VSS and SDAT / T2 pins are grounded, and the sampling input circuit is connected between the SWO / T1 and OUT pins. In a possible implementation, the resistance of R10 is 10Ω, and the capacitance of C13 and C14 is 100nF / 50V.

[0030] In a possible implementation, the sampling input circuit includes resistors R11, R12 and R17, capacitors C15, C16 and C19. The SWO / T1 pin of U4 is cascaded with resistor R17 and capacitor C19 in sequence, the OUT pin is externally connected to one end of resistor R11, the other end of resistor R11 is connected to capacitor C16 and pull-up resistor R12, and the Hall input signal HALL_IO is derived, the Hall input signal is connected to the MCU controller, and the pull-up resistor R12 is connected to the +5V input power supply. The OUT pin is also externally connected to capacitor C15, and capacitors C15, C16 and C19 are grounded together. This structure is mainly for signal filtering to obtain stable input. In some embodiments, the resistance values ​​of resistors R17 and R11 are selected to be 50Ω, the resistance value of R12 is selected to be 2.2KΩ, the capacity of C15 is 100pF / 50V, the capacity of C16 is 1nF / 50V, and the capacity of C19 is 4.7nF / 50V.

[0031] Figure 3 It is a circuit diagram of an interface communication circuit, which includes a LIN bus interface chip U3 (STM8S103), a VBAT pin of the LIN bus interface chip is connected to one end of a capacitor C9, and the other end of C9 is grounded together with a GND pin. The LIN pin is used as a communication interface, and an external resistor R5 is connected, and an external communication signal is input to U3 through R5. The VBAT pin is also connected to an external power supply VCC, and VCC is connected to a diode D, and the output of the diode D is connected to the VBAT pin. The TXD and RXD pins of the LIN bus interface chip U3 are respectively connected to the MCU controller, and are mainly used to receive and send control signals, that is, to change the hot and cold mode of the thermal management system. A resistor R6 is connected between the VCC pin and the RSTN pin, and an external power supply is connected to the VCC pin, and one end connected to the resistor R6 is also connected to one end of a capacitor C10 in sequence, and the other end of the capacitor C10 is grounded. In this embodiment, the resistance of the resistor R5 is 62Ω, the resistance of the R6 is 10KΩ, and the capacity of the capacitor C9 is 100nF / 50V.

[0032] Figure 4It is a circuit structure diagram of a motor drive circuit. The IN1 and IN2 pins of the motor drive chip U1 (FC7706) in the motor drive circuit are connected to the MCU controller. The pins are used to receive the digital PWM signal of the MCU controller, and the precise control of the drive motor M is mainly achieved based on this digital signal. OUT1 and OUT2 of U1 are pins connected to the drive motor to control the specific rotation of the motor. Capacitor C8 and a transient suppression diode are connected in parallel between the OUT1 and OUT2 pins. Terminals Motor+ and Motor- are drawn at both ends of the transient suppression diode and connected to the M+ and M- terminals of the motor. In some embodiments, the resistance value of capacitor C8 is selected as 2.2nF / 50V, and the transient suppression diode is TVS2 SMBJ24CA.

[0033] The VCC pin of the motor drive circuit is connected to the external power supply VCC, and the VCC pin is connected to one end of two parallel capacitors C6 and C7. The other ends of capacitors C6 and C7 are connected to the PAD pin and grounded. In this structure, the capacity of C6 is 10uF / 35V, and the capacity of C6 is 100nF / 50V. The CS pin of the motor drive circuit leads to the current detection signal end, which is connected to the MCU controller, mainly for current detection. The CS pin is also connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the PAD pin, and the two ends of the resistor R3 are connected in parallel with a capacitor C20, the capacity of capacitor C20 is 100nF / 50V, and the resistance of resistor R3 is 100mΩ.

[0034] Figure 5 This is the connection diagram of the MCU controller chip, where pins 10 and 11 are used to communicate with the U2 (ST1028Q) chip, pins 4 and 6 output PWM waves and input them to the U1 chip. Pin 16 of U3 receives the HALL_IO output of U4.

[0035] In addition, in order to ensure the stability and safety of the system, the present application also additionally provides a power supply circuit and a temperature detection circuit.

[0036] Figure 6 It is a structural diagram of a voltage detection circuit provided in an embodiment of the present application, and the voltage detection circuit leads to an input terminal from an external power supply VCC, and VCC is cascaded with resistors R13 and R14 in sequence, and is grounded through a resistor R14. The resistance of R13 is 510K, and the resistance of R14 is 51K. In addition, a Schottky diode Z2 and a capacitor C17 are connected in parallel at both ends of the resistor R14, and a voltage detection signal terminal VBAT_TEST is outputted from the resistor R13, and the voltage detection signal terminal is connected to the 15 pin of the MCU controller U3. The capacity of the Schottky diode Z2 is 5.1 / 0.5W, and the capacity of the capacitor C17 is 10nF / 50V.

[0037] Figure 7It is a schematic diagram of the structure of the temperature detection circuit provided in the embodiment of the present application, wherein the +5V voltage end of the temperature detection circuit is connected to one end of the resistor R15, the other output end of the resistor R15 is respectively connected to one end of the NTC thermistor and one end of the resistor R6, the other end of the NTC thermistor is output to ground, the other output end of the resistor R16 is connected to one end of the capacitor C18, and the other end of the capacitor C18 is output to ground; a temperature detection signal end is drawn between the resistor R16 and the capacitor C18, and the temperature detection signal end is connected to the MCU control chip. In some embodiments, the resistance value of the resistor R15 can be selected as 2KΩ, the resistance value of the R16 can be selected as 5.1KΩ, the resistance value of the NTC thermistor can be selected as 10KΩ, and the capacity of the capacitor C18 can be selected as 1nF / 50V.

[0038] In summary, this application replaces the annular carbon film potentiometer in the traditional multi-way valve with a Hall sensor. The Hall sensor collects, detects and controls the rotation angle of the multi-way valve. The voltage detection circuit can safely monitor VCC to ensure the stability of the circuit. The interface communication circuit is used to change the working mode of the thermal management system of new energy vehicles. The magnetic control angle control circuit detects the rotation angle in real time. The MCU controller determines the output digital PWM signal, which is driven after encoding by the motor drive circuit to achieve high-precision magnetic control. The detection range can reach 1 degree wide, and the full range detection from 0 to 360 degrees can be achieved. The detection result is a digital PWM signal with strong anti-interference ability.

[0039] The preferred embodiments of the present invention are described above; it should be understood that the present invention is not limited to the above-mentioned specific implementation modes, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention; therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-way valve execution control circuit for new energy vehicles, characterized in that: It includes an MCU controller, an interface communication circuit connected to the MCU controller, a magnetically controlled angle control circuit including a magnetic angle sensor chip, and a motor drive circuit voltage detection circuit; wherein the Hall sensor is arranged on the drive motor to collect the rotation angle of the magnetically controlled multi-way valve; The interface communication circuit receives external serial port input and inputs bus control signals to the MCU controller; the voltage detection circuit detects the voltage of the input external power supply and inputs it to the MCU controller; The magnetic control angle control circuit is connected to the drive motor, collects the rotation angle of the magnetic control multi-way valve, determines the magnetic control rotation angle through the MCU controller and outputs a digital PWM signal; the motor drive circuit controls the drive motor to rotate to a target angle according to the digital PWM signal.

2. The multi-way valve execution control circuit for new energy vehicles according to claim 1 is characterized in that: The magnetically controlled angle control circuit includes a magnetic angle sensor chip, the VDD pin of the magnetic angle sensor chip is connected to the input power supply through a current limiting resistor R10, and both ends of R10 are grounded through capacitors C13 and C14 respectively; the CN / T0 pin and the SCK pin are connected to the ground ends of capacitors C13 and C14; the VSS and SDAT / T2 pins are grounded, and a sampling input circuit is connected between the SWO / T1 and OUT pins.

3. The multi-way valve execution control circuit for new energy vehicles according to claim 2 is characterized in that: The sampling input circuit includes resistors R11, R12 and R17, capacitors C15, C16 and C19; the SWO / T1 pin is connected in cascade with resistor R17 and capacitor C19 in sequence, the OUT pin is connected to one end of the resistor R11, the other end of the resistor R11 is connected to capacitor C16 and pull-up resistor R12, and the Hall input signal is led out, and the Hall input signal is connected to the MCU controller; the pull-up resistor R12 is connected to the input power supply; The OUT pin is also externally connected to a capacitor C15, and capacitors C15, C16 and C19 are commonly grounded.

4. The multi-way valve execution control circuit for new energy vehicles according to claim 1 is characterized in that: The interface communication circuit includes a LIN bus interface chip, the VBAT pin of the LIN bus interface chip is connected to one end of a capacitor C9, and the other end of C9 and a GND pin are grounded together; the LIN pin passes through one end of a resistor R5, and the other end is an interface signal input end; an external power supply VCC is connected to a diode D, and the output of the diode D is connected to the VBAT pin; The TXD and RXD pins of the LIN bus interface chip are respectively connected to the MCU controller for receiving and sending control signals; a resistor R6 is connected between the VCC pin and the RSTN pin, and an external power supply is connected to the VCC pin. The end connected to the resistor R6 is also connected to one end of the capacitor C10 in turn, and the other end of the capacitor C10 is grounded.

5. The multi-way valve execution control circuit for new energy vehicles according to claim 1 is characterized in that: The IN1 and IN2 pins of the motor drive chip in the motor drive circuit are connected to the MCU controller to receive the digital PWM signal of the MCU controller; a capacitor C8 and a transient suppression diode are connected in parallel between the OUT1 and OUT2 pins, and terminals are drawn at both ends of the transient suppression diode to connect the drive motor.

6. The multi-way valve execution control circuit for new energy vehicles according to claim 5 is characterized in that: The VCC pin of the motor drive circuit is connected to the external power supply VCC, the VCC pin is externally connected to one end of two parallel capacitors C6 and C7, and the other ends of the capacitors C6 and C7 are connected to the PAD pin and grounded; The CS pin of the motor drive circuit leads to a current detection signal terminal, and the current detection signal terminal is connected to the MCU controller; The CS pin is also externally connected to one end of a resistor R3, the other end of the resistor R3 is connected to the PAD pin, and a capacitor C20 is connected in parallel across both ends of the resistor R3.

7. The multi-way valve execution control circuit for new energy vehicles according to claim 1 is characterized in that: The voltage detection circuit is connected to an external power supply VCC, and the input terminal is connected in cascade with resistors R13 and R14 in sequence, and is grounded through the resistor R14; a Schottky diode Z2 and a capacitor C17 are connected in parallel at both ends of the resistor R14, and a voltage detection signal terminal is output from the resistor R13, and the voltage detection signal terminal is connected to the MCU controller.

8. The multi-way valve execution control circuit for new energy vehicles according to claim 1 is characterized in that: The MCU controller is also connected to a temperature detection circuit, wherein a voltage end of the temperature detection circuit is connected to one end of a resistor R15, the other output end of the resistor R15 is respectively connected to one end of an NTC thermistor and one end of a resistor R6, the other end of the NTC thermistor is output to ground, the other output end of the resistor R16 is connected to one end of a capacitor C18, and the other end of the capacitor C18 is output to ground; a temperature detection signal end is drawn between the resistor R16 and the capacitor C18, and the temperature detection signal end is connected to the MCU control chip.

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