Circuit for detecting heart rate by using electrocardiogram waveform for vehicle-mounted intelligent cabin

Abstract

The utility model relates to the technical field of intelligent cabins, and discloses a vehicle-mounted intelligent cabin heart rate detection circuit by using an electrocardio waveform, which comprises a power supply module for providing 5V and 3.3 V stable electric energy for the electrocardio waveform heart rate detection circuit; the MCU control module is used for detecting electrocardiosignals and calculating the heart rate; an electrocardio lead interface module; the electrocardiosignal amplifying and filtering module is used for improving the signal-to-noise ratio and anti-interference performance of the electrocardiosignal; the Bluetooth communication module transmits the heart rate information to the vehicle-mounted display screen through a Bluetooth protocol; the heart rate information is transmitted to a CAN communication module of a vehicle-mounted electric control system through a CAN bus; according to the utility model, a driver does not need to wear the device, measurement can be carried out only by holding the steering wheel with a hand, the display screen can be controlled in the center, electrocardiogram waveform changes can be observed, the heart rate can be displayed, the accuracy of monitoring data is improved, corresponding safety early warning is provided, more convenient and safer driving experience is provided for the driver, and the risk of traffic accidents is reduced to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of intelligent cockpit technology, specifically to a circuit for detecting heart rate using electrocardiogram waveforms in an in-vehicle intelligent cockpit. Background Technology

[0002] The intelligent cockpit, hailed as the "third space" of the car, is more than just a simple driving environment; it's an important living space for both driver and passengers during the journey. In this space, people expect to enjoy a more intelligent and personalized service experience. An intelligent cockpit incorporating a "health" dimension represents a new direction that can meet this demand.

[0003] Traditional methods for detecting heart rate include: portable electronic bracelets and watches; and home-use non-portable electronic blood pressure monitors.

[0004] The above-mentioned traditional methods of heart rate detection require drivers to wear wristbands or watches, require the subjective willingness of drivers and passengers, and require them to keep them safe after use to avoid loss;

[0005] Therefore, we need to propose an in-vehicle intelligent cockpit circuit that uses electrocardiogram waveforms to detect heart rate. This circuit does not require the driver to wear a mask; the driver only needs to hold the steering wheel to measure the heart rate. The changes in the electrocardiogram waveform can be observed and the heart rate can be displayed on the central control screen, providing the driver with a more convenient and safer driving experience. Utility Model Content

[0006] The purpose of this invention is to provide a vehicle-mounted intelligent cockpit circuit that uses electrocardiogram (ECG) waveforms to detect heart rate. This circuit does not require the driver to wear a mask; the driver only needs to hold the steering wheel to measure the heart rate. The ECG waveform changes can be observed and the heart rate can be displayed on the central control screen, improving the accuracy of the monitoring data and providing corresponding safety warnings. This provides the driver with a more convenient and safer driving experience and reduces the risk of traffic accidents to a certain extent, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a vehicle-mounted intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms, comprising:

[0008] A power supply module that provides stable 5V and 3.3V power to the ECG waveform detection heart rate circuit;

[0009] An MCU control module used to detect electrocardiogram signals and calculate heart rate;

[0010] The ECG lead interface module is used to transmit human ECG signals to the ECG waveform detection and heart rate circuit.

[0011] ECG signal amplification and filtering module used to improve the signal-to-noise ratio and anti-interference of ECG signals;

[0012] The Bluetooth communication module transmits heart rate information to the vehicle's display screen via Bluetooth protocol.

[0013] Heart rate information is transmitted to the CAN communication module of the vehicle's electronic control system via the CAN bus.

[0014] The power supply module includes a 9-26V input module, a 5V output module, a 3.3V output module, and an external interface module. The 3.3V output module and the ECG lead interface module are electrically connected to the ECG signal amplification and filtering module. The 3.3V output module is also electrically connected to the Bluetooth communication module and the MCU control module. The ECG signal amplification and filtering module is electrically connected to the MCU control module. The 5V output module and the MCU control module are both electrically connected to the CAN communication module. The CAN communication module is electrically connected to the external interface module.

[0015] Preferably, the 5V output module includes a chip U14, with a surface-mount ferrite bead FB10 connected to pin 8 of the chip U14. One end of the surface-mount ferrite bead FB10 is connected to a 24V input voltage. A resistor R119, a capacitor C112, an inductor L6 connected in parallel, and a diode D14 are connected sequentially to pin 1 of the chip U14. The terminals of the inductor L6 and the diode D14 output a 5V voltage.

[0016] Preferably, the 3.3V output module includes a chip U2, with pin 4 of the chip U2 connected to a 5V input voltage, and pin 3 of the chip U2 connected in series with an inductor L3 and a surface mount ferrite bead FB4, with one end of the surface mount ferrite bead FB4 outputting a 3.3V voltage.

[0017] Preferably, the MCU control module includes an MCU main control unit, a storage unit electrically connected to the MCU main control unit, a reset unit, a programming port unit, an external input detection unit, and a crystal oscillator unit;

[0018] The MCU main control unit includes a chip U3, with pins 1 and 27 of the chip U3 both connected to a 3.3V voltage. The external input detection unit includes a transistor Q1, with a capacitor C38, a resistor R34, a series resistor R33, and a diode Z2 connected to pin 1 of the transistor Q1. Pin 3 of the transistor Q1 is connected to pin 15 of the chip U3, and a resistor R32 connected to pin 1 of the chip U3 is also connected to pin 3 of the transistor Q1.

[0019] Preferably, the ECG lead interface module includes a lead wire interface J3, and the ECG signal amplification and filtering module includes a protection filter unit, a first-stage filter follower unit, a differential amplification unit, a second-stage amplification and filtering unit, a third-stage amplification and filtering unit, a fourth-stage amplification and filtering unit, a fifth-stage filter follower unit, and a lead drop detection unit connected between the first-stage filter follower unit and the differential amplification unit, wherein the protection filter unit is electrically connected to the lead wire interface J3.

[0020] Preferably, the Bluetooth communication module includes a chip U6 and a transistor Q8. Resistors R53 and R54 are connected between pins 6 and 7 of the chip U6. Resistors R51 and R52 are connected sequentially to pin 2 of the chip U6. One end of resistor R51 is connected to capacitor C46. One end of resistor R52 is connected to capacitor C48 and diode ESD3. The terminals of resistors R51 and R52 are connected to capacitor C47.

[0021] A resistor R59 and a capacitor C52 are connected to pin 3 of the transistor Q8. One end of the resistor R59 is connected to pin 4 of the chip U6, and pin 3 of the transistor Q8 is connected to pin 10 of the chip U6.

[0022] Preferably, the CAN communication module includes a chip U7, with resistor R62 connected to pin 1 of chip U7, 5V voltage connected to pin 3 of chip U7, resistor R63 connected to pin 4 of chip U7, resistors R64 and R70 connected to pin 6 of chip U7, resistor R69 connected to pin 7 of chip U7, resistor R65 connected to pin 12 of chip U7, resistor R66 connected to pin 13 of chip U7, and resistor R67 connected to pin 14 of chip U7.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This invention eliminates the need for the driver to wear a device; the measurement can be performed simply by holding the steering wheel. The ECG waveform changes and heart rate can be observed on the central control display screen, improving the accuracy of the monitoring data and providing corresponding safety warnings. This offers the driver a more convenient and safer driving experience and reduces the risk of traffic accidents to some extent. Attached Figure Description

[0025] Figure 1 This is a system block diagram of the present invention;

[0026] Figure 2 This is the circuit diagram of the 9-26V input module of this utility model;

[0027] Figure 3 This is the circuit diagram of the 5V output module of this utility model;

[0028] Figure 4 This is the circuit diagram of the 3.3V output module of this utility model;

[0029] Figure 5 This is the circuit diagram of the MCU main control unit of this utility model;

[0030] Figure 6 This is a circuit diagram of the storage unit of this utility model;

[0031] Figure 7 This is a circuit diagram of the reset unit of this utility model;

[0032] Figure 8 This is a circuit diagram of the programming port unit of this utility model;

[0033] Figure 9 This is a circuit diagram of the external input detection unit of this utility model;

[0034] Figure 10 This is the circuit diagram of the crystal oscillator unit of this utility model;

[0035] Figure 11 This is a circuit diagram of the Bluetooth communication module of this utility model;

[0036] Figure 12 This is a circuit diagram of the CAN communication module of this utility model;

[0037] Figure 13 This is a circuit diagram of the CAN chip filter circuit of this utility model;

[0038] Figure 14 Circuit diagram of the filter device that powers the CAN chip of this utility model;

[0039] Figure 15 This is a circuit diagram of the CAN communication wake-up module of this utility model;

[0040] Figure 16 This is a circuit diagram of the ECG lead interface module and the ECG signal amplification and filtering module of this utility model;

[0041] Figure 17 This is a schematic diagram of the structure of the steering wheel of this utility model. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figure 1-17 This utility model provides a technical solution: an in-vehicle intelligent cockpit utilizes an electrocardiogram (ECG) waveform to detect heart rate. The driver holds the conductive plates on both sides of the steering wheel with both hands, and the ECG waveform and heart rate are displayed visually on the central control screen, along with corresponding safety warnings. Such an intelligent cockpit not only provides a healthy driving experience but also reduces the risk of traffic accidents to some extent. It includes:

[0044] A power supply module that provides stable 5V and 3.3V power to the ECG waveform detection heart rate circuit;

[0045] The power module includes a 9-26V input module, a 5V output module, a 3.3V output module, and an external interface module;

[0046] The 5V output module includes a chip U14. A surface-mount ferrite bead FB10 is connected to pin 8 of the chip U14. One end of the surface-mount ferrite bead FB10 is connected to a 24V input voltage. A resistor R119, a capacitor C112, an inductor L6 connected in parallel, and a diode D14 are connected in sequence to pin 1 of the chip U14. The terminals of the inductor L6 and the diode D14 output a 5V voltage.

[0047] The 3.3V output module includes a chip U2, with pin 4 of the chip U2 connected to a 5V input voltage. Pin 3 of the chip U2 is connected in sequence to an inductor L3 and a surface-mount ferrite bead FB4. One end of the surface-mount ferrite bead FB4 outputs a 3.3V voltage.

[0048] The circuit of the 9-26V input module is as follows: Figure 2 As shown, the components TVS1, fuse F1, inductor L2, diode D1, capacitors C1, C14, C2, C15, C128, C129, C131, C130, C3, C4, C5, C6, C7, inductor L1, capacitors C124, C125, C8, C126, C127, C9, C10, C11, C12, C13, and resistor R1 form a power input filtering circuit to stabilize the voltage.

[0049] Chip U14 outputs 5V, and chip U2 outputs 3.3V to power the circuit.

[0050] The circuit of the 5V output module is as follows: Figure 3 As shown, the surface-mount ferrite bead FB10, capacitor C123, resistor R129, capacitor C119, capacitor C120, and capacitor C121 form the input filter circuit for the 24V to 5V DC-DC power supply U14.

[0051] Resistors R130, R125, C122, Z5, R116, R117, R115, D11, D12, and D13 form the power supply switching control circuit.

[0052] Resistor R123, capacitor C116, resistor R127, resistor R128, resistor R119, capacitor C112, resistor R124, capacitor C111, diode D14, inductor L6, resistor R126, resistor R118, resistor R121, and resistor R122 constitute the external working circuit of the power supply.

[0053] Capacitors C117, C113, C115, C136, C137, FB3 (surface bead), R4, C24, C25, and C26 form the power output filter circuit.

[0054] The circuit of the 3.3V output module is as follows: Figure 4 As shown, capacitors C29 and C30 form the input filter circuit for the 24V to 3.3V DC-DC power chip U2; resistor R11 and capacitor C35 form the power chip U2's turn-on control circuit; inductor L3, capacitor C33, resistor R13, and resistor R14 form the power chip U2's peripheral operating circuit; capacitors C31, C138, C139, C10, C32, C34, and surface-mount ferrite bead FB4 form the power chip U2's output filter capacitors; CON4 is the power input and CAN communication interface socket; and surface-mount ferrite bead FB1, capacitors C16 and C17, and ESD1 form the filter circuit for the vehicle ignition detection signal.

[0055] An MCU control module used to detect electrocardiogram signals and calculate heart rate;

[0056] The MCU control module includes an MCU main control unit, a storage unit electrically connected to the MCU main control unit, a reset unit, a programming port unit, an external input detection unit, and a crystal oscillator unit;

[0057] The MCU main control unit includes a chip U3, with pins 1 and 27 of the chip U3 both connected to a 3.3V voltage. The external input detection unit includes a transistor Q1, with a capacitor C38, a resistor R34, a series resistor R33, and a diode Z2 connected to pin 1 of the transistor Q1. Pin 3 of the transistor Q1 is connected to pin 15 of the chip U3, and a resistor R32 connected to pin 1 of the chip U3 is also connected to pin 3 of the transistor Q1.

[0058] The surface-mount ferrite bead FB5 and capacitors C141 to C145 are filtering components of the MCU main control unit;

[0059] The ECG lead interface module is used to transmit human ECG signals to the ECG waveform detection and heart rate circuit.

[0060] ECG signal amplification and filtering module used to improve the signal-to-noise ratio and anti-interference of ECG signals;

[0061] The ECG lead interface module includes a lead wire interface J3. The ECG signal amplification and filtering module includes a protection filter unit, a first-stage filter follower unit, a differential amplification unit, a second-stage amplification and filtering unit, a third-stage amplification and filtering unit, a fourth-stage amplification and filtering unit, a fifth-stage filter follower unit, and a lead drop detection unit connected between the first-stage filter follower unit and the differential amplification unit. The protection filter unit is electrically connected to the lead wire interface J3.

[0062] The protection filter unit includes diode ESD4 connected to pin 1 of the lead-in interface J3, diode ESD5 connected to pin 2 of the lead-in interface J3, inductor L5 connected between pins 1 and 2 of the lead-in interface J3, and diodes D9 and D10 connected to inductor L5.

[0063] The first-stage filter follower unit includes amplifiers U8C and U8D; the differential amplifier unit includes amplifier U8B; the second-stage amplification and filter unit includes amplifier U9A; the third-stage amplification and filter unit includes amplifier U9B; the fourth-stage amplification and filter unit includes amplifier U9C; the fifth-stage filter follower unit includes amplifier U10; and the lead detachment detection unit includes amplifiers U8A and U11.

[0064] The Bluetooth communication module transmits heart rate information to the vehicle's display screen via Bluetooth protocol.

[0065] The Bluetooth communication module includes a chip U6 and a transistor Q8. Resistors R53 and R54 are connected between pins 6 and 7 of the chip U6. Resistors R51 and R52 are connected sequentially to pin 2 of the chip U6. One end of resistor R51 is connected to capacitor C46. One end of resistor R52 is connected to capacitor C48 and diode ESD3. The terminals of resistors R51 and R52 are connected to capacitor C47.

[0066] A resistor R59 and a capacitor C52 are connected to pin 3 of the transistor Q8. One end of the resistor R59 is connected to pin 4 of the chip U6, and pin 3 of the transistor Q8 is connected to pin 10 of the chip U6.

[0067] The Bluetooth communication module also includes a Bluetooth power supply unit, which includes transistor Q5 and transistor Q3. Pin 3 of transistor Q5 is connected to pin 1 of transistor Q3. Pin 3 of transistor Q3 is connected to a resistor R46, a capacitor C42, and a capacitor C43 connected in parallel.

[0068] Heart rate information is transmitted to the CAN communication module of the vehicle's electronic control system via the CAN bus.

[0069] The CAN communication module includes a chip U7. Pin 1 of the chip U7 is connected to a resistor R62. Pin 3 of the chip U7 is connected to a 5V voltage. Pin 4 of the chip U7 is connected to a resistor R63. Pin 6 of the chip U7 is connected to resistors R64 and R70. Pin 7 of the chip U7 is connected to a resistor R69. Pin 12 of the chip U7 is connected to a resistor R65. Pin 13 of the chip U7 is connected to a resistor R66. Pin 14 of the chip U7 is connected to a resistor R67.

[0070] The CAN communication module also includes a CAN chip power supply filter, a CAN communication wake-up module, and a filter circuit from the CAN chip to the interface socket;

[0071] The power supply filter for the CAN chip includes an inductor L4, one end of which is connected to capacitors C61 and C62, and the other end of which is connected to capacitors C63 and C64 and diode TVS2.

[0072] The CAN communication wake-up module includes a resistor R68, one end of which is connected to capacitors C132, C133, C134, and C135 connected in parallel.

[0073] The filtering circuit from the CAN chip to the interface socket includes a surface-mount ferrite bead FB8, capacitors C55 and C56 connected in parallel at one end of the surface-mount ferrite bead FB8, and capacitors C57 and C58 connected in parallel.

[0074] The 3.3V output module and the ECG lead interface module are both electrically connected to the ECG signal amplification and filtering module. The 3.3V output module is also electrically connected to the Bluetooth communication module and the MCU control module. The ECG signal amplification and filtering module is electrically connected to the MCU control module. The 5V output module and the MCU control module are both electrically connected to the CAN communication module. The CAN communication module is electrically connected to the external interface module.

[0075] Hold the conductive plate with both hands. The signal is connected to the board via the lead wire. After being amplified and filtered, the signal is connected to the MCU control module. The MCU control module samples the signal with the ADC, calculates the number of peak values, and calculates the heart rate data over a certain period of time. The data is then output via the CAN communication module or the Bluetooth communication module.

[0076] The 5V output module can convert 9-26V voltage to 5V voltage output, and the 3.3V output module can convert 5V voltage to 3.3V voltage output.

[0077] The innovative design of this solution includes: a steering wheel conductive plate, an ECG circuit, and a CAN communication method. The steering wheel is structurally modified by installing a metal conductive plate on the steering wheel and connecting it to the PCBA board interface through a shielded wire. The PCBA board is installed inside the steering wheel.

[0078] The vehicle's central control screen can display the calculated heart rate value, software ADC sampling, detect ECG waveforms, and calculate the number of peak values.

[0079] It does not require the driver to wear a mask; the measurement can be performed simply by holding the steering wheel. The ECG waveform changes and heart rate can be observed on the central control display screen, providing the driver with a more convenient and safer driving experience.

[0080] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit for detecting heart rate using electrocardiogram waveforms in an in-vehicle intelligent cockpit, characterized in that, include: A power supply module that provides stable 5V and 3.3V power to the ECG waveform detection heart rate circuit; An MCU control module used to detect electrocardiogram signals and calculate heart rate; The ECG lead interface module is used to transmit human ECG signals to the ECG waveform detection and heart rate circuit. ECG signal amplification and filtering module used to improve the signal-to-noise ratio and anti-interference of ECG signals; The Bluetooth communication module transmits heart rate information to the vehicle's display screen via Bluetooth protocol. Heart rate information is transmitted to the CAN communication module of the vehicle's electronic control system via the CAN bus. The power supply module includes a 9-26V input module, a 5V output module, a 3.3V output module, and an external interface module. The 3.3V output module and the ECG lead interface module are electrically connected to the ECG signal amplification and filtering module. The 3.3V output module is also electrically connected to the Bluetooth communication module and the MCU control module. The ECG signal amplification and filtering module is electrically connected to the MCU control module. The 5V output module and the MCU control module are both electrically connected to the CAN communication module. The CAN communication module is electrically connected to the external interface module.

2. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The 5V output module includes a chip U14. A surface-mount ferrite bead FB10 is connected to pin 8 of the chip U14. One end of the surface-mount ferrite bead FB10 is connected to a 24V input voltage. A resistor R119, a capacitor C112, an inductor L6 connected in parallel, and a diode D14 are connected in sequence to pin 1 of the chip U14. The terminals of the inductor L6 and the diode D14 output a 5V voltage.

3. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The 3.3V output module includes a chip U2, with pin 4 of the chip U2 connected to a 5V input voltage. Pin 3 of the chip U2 is connected in sequence to an inductor L3 and a surface-mount ferrite bead FB4. One end of the surface-mount ferrite bead FB4 outputs a 3.3V voltage.

4. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The MCU control module includes an MCU main control unit, a storage unit electrically connected to the MCU main control unit, a reset unit, a programming port unit, an external input detection unit, and a crystal oscillator unit; The MCU main control unit includes a chip U3, with pins 1 and 27 of the chip U3 both connected to a 3.3V voltage. The external input detection unit includes a transistor Q1, with a capacitor C38, a resistor R34, a series resistor R33, and a diode Z2 connected to pin 1 of the transistor Q1. Pin 3 of the transistor Q1 is connected to pin 15 of the chip U3, and a resistor R32 connected to pin 1 of the chip U3 is also connected to pin 3 of the transistor Q1.

5. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The ECG lead interface module includes a lead wire interface J3. The ECG signal amplification and filtering module includes a protection filter unit, a first-stage filter follower unit, a differential amplification unit, a second-stage amplification and filtering unit, a third-stage amplification and filtering unit, a fourth-stage amplification and filtering unit, a fifth-stage filter follower unit, and a lead drop detection unit connected between the first-stage filter follower unit and the differential amplification unit. The protection filter unit is electrically connected to the lead wire interface J3.

6. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The Bluetooth communication module includes a chip U6 and a transistor Q8. Resistors R53 and R54 are connected between pins 6 and 7 of the chip U6. Resistors R51 and R52 are connected sequentially to pin 2 of the chip U6. One end of resistor R51 is connected to capacitor C46. One end of resistor R52 is connected to capacitor C48 and diode ESD3. The terminals of resistors R51 and R52 are connected to capacitor C47. A resistor R59 and a capacitor C52 are connected to pin 3 of the transistor Q8. One end of the resistor R59 is connected to pin 4 of the chip U6, and pin 3 of the transistor Q8 is connected to pin 10 of the chip U6.

7. The in-vehicle intelligent cockpit circuit for detecting heart rate using electrocardiogram waveforms according to claim 1, characterized in that: The CAN communication module includes a chip U7. Pin 1 of the chip U7 is connected to a resistor R62. Pin 3 of the chip U7 is connected to a 5V voltage. Pin 4 of the chip U7 is connected to a resistor R63. Pin 6 of the chip U7 is connected to resistors R64 and R70. Pin 7 of the chip U7 is connected to a resistor R69. Pin 12 of the chip U7 is connected to a resistor R65. Pin 13 of the chip U7 is connected to a resistor R66. Pin 14 of the chip U7 is connected to a resistor R67.

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