Electronic brake pedal, electronic brake system and vehicle

Abstract

The invention discloses an electronic brake pedal, an electronic brake system and a vehicle, the electronic brake pedal comprises a pedal, a pedal seat and a shell, the pedal is rotatably supported on the pedal seat through a pin shaft, a mounting hole is formed in the pedal seat, a pushing assembly is arranged in the mounting hole in a sliding fit mode, a roller shaft is fixed on the pedal, and the roller shaft is fixed on the shell. The roll shaft abuts against the upper end of the pushing assembly, the shell is located at the lower end of the pedal base, and a sensor and an elastic piece used for providing reset acting force for the pushing assembly are arranged in the shell. The electronic brake pedal is good in transmission stability and signal accuracy.

Description

Technical Field

[0001] This invention relates to the field of electronic braking technology, and in particular to an electronic brake pedal, an electronic braking system, and a vehicle. Background Technology

[0002] A vehicle's braking system includes a pedal, booster, brake pump, and brakes. The pedal is further divided into mechanical brake pedals and electronic brake pedals. However, mechanical braking has a slower response speed and lower control precision. With the development of new energy vehicles, electronic brake pedals are widely used in hybrid electric vehicles and pure electric vehicles. However, the disclosed electronic brake pedal technologies exhibit poor transmission stability and signal accuracy. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes an electronic brake pedal, an electronic braking system and a vehicle.

[0004] The technical solution of the present invention is implemented as follows: The present invention discloses an electronic brake pedal, including a pedal, a pedal seat and a housing. The pedal is rotatably supported on the pedal seat by a pin. The pedal seat is provided with a mounting hole. A push assembly is slidably fitted in the mounting hole. A roller is fixed on the pedal. The roller abuts against the upper end of the push assembly. The housing is located at the lower end of the pedal seat. The housing is provided with a sensor and an elastic element for providing a reset force for the push assembly.

[0005] The roller is fixedly mounted on the pad, the pad is fixedly connected to the pedal, and the pad is rotatably supported on the pedal seat by a pin.

[0006] In some embodiments, one end of the elastic member abuts against the lower end of the pushing assembly, and the other end of the elastic member abuts against the housing;

[0007] And / or,

[0008] The lower end of the pushing component extends into the housing and slides with the housing. An elastic element mounting seat is fixedly installed inside the housing. When the elastic element is in the initial state, there is a gap between the elastic element mounting seat and the pushing component, and there is a gap between the pushing component and the sensor.

[0009] And / or,

[0010] The elastic element is a spring;

[0011] And / or,

[0012] The lower surface of the pedal is provided with a limit protrusion, and a limit bolt is threaded onto the pedal seat. When the elastic element is in the initial state, the limit protrusion can abut against the top of the limit bolt.

[0013] In some embodiments, the elastic element mounting base is provided with a first groove for receiving the lower end of the elastic element, and the bottom of the first groove of the elastic element mounting base is provided with a through hole for the sensor or sensor mounting base to pass through.

[0014] The sensor is fixed on a sensor mounting base, which is fixed on the housing, and the sensor is located inside the spring.

[0015] When the spring is in its initial state, it pushes the component to remain in the preset initial position.

[0016] In some embodiments, the pushing assembly includes a pusher plate and a movable sleeve. The upper end of the movable sleeve is closed, and the lower end of the movable sleeve is open. The upper end of the movable sleeve extends outward from the mounting hole of the pedal seat and contacts the roller shaft. The outer wall of the lower end of the movable sleeve is in clearance fit with the mounting hole of the pedal seat. The upper end of the pusher plate is fitted inside the movable sleeve, and the lower end of the pusher plate is in clearance fit with the inner cavity of the housing.

[0017] The lower end face of the pusher is provided with a second groove for accommodating the upper end of the elastic element.

[0018] The lower outer diameter of the push plate is larger than the upper outer diameter of the push plate, and the lower outer diameter of the push plate is larger than the diameter of the mounting hole of the pedal seat.

[0019] A bushing is fixed inside the mounting hole of the pedal seat, and the pushing component is clearance-fitted with the bushing. The bushing is interference-fitted with the mounting hole of the pedal seat.

[0020] The upper opening of the mounting hole of the pedal seat is provided with a dust cover, which is located between the pedal seat and the push assembly.

[0021] In some embodiments, the electronic brake pedal of the present invention further includes a circuit board, the sensor being electrically connected to the circuit board, the circuit board having a power supply circuit and a sensor signal processing circuit, the power supply circuit being used to supply power to the sensor signal processing circuit and the sensor, and the sensor signal processing circuit being configured to convert the displacement signal output by the sensor into a digital signal.

[0022] In some embodiments, the electronic brake pedal of the present invention further includes a sensor cover plate, the side wall of the housing is provided with an electrical mounting groove, the circuit board is located in the electrical mounting groove, the sensor cover plate is fixed in the electrical mounting groove, and a socket for electrical connection with the brake control unit is fixedly installed on the sensor cover plate.

[0023] The circuit board is fixedly connected to the sensor cover.

[0024] The housing contains two sensors.

[0025] The housing contains two circuit boards.

[0026] In some embodiments, the circuit board is provided with a power supply circuit and a sensor signal processing circuit. The power supply circuit is used to supply power to the sensor signal processing circuit and the sensor. The sensor signal processing circuit is configured to convert the displacement signal output by the sensor into a digital signal.

[0027] In some embodiments, the sensor signal processing circuit includes a triangular wave signal generation circuit and a comparator. The first input terminal of the comparator is electrically connected to the output terminal of the triangular wave signal generation circuit, and the second input terminal of the comparator is electrically connected to the sensor. The comparator is used to receive the triangular waveform output by the triangular wave signal generation circuit and a DC voltage signal corresponding to the displacement of the sensor, compare the triangular waveform with the DC voltage signal, and output a PWM signal.

[0028] The triangular wave signal generating circuit consists of a hysteresis comparator and an RC charging and discharging circuit, and is used to output a periodic triangular wave signal.

[0029] The triangular wave signal generating circuit includes an operational amplifier U1A. The positive input terminal of the operational amplifier U1A is electrically connected to the power supply voltage divider node of the voltage divider network. The output terminal of the operational amplifier U1A is electrically connected to the positive input terminal of the operational amplifier U1A via a positive feedback branch. The output terminal of the operational amplifier U1A is electrically connected to a first voltage via a resistor R1. The output terminal of the operational amplifier U1A is electrically connected to one end of a resistor R9. The other end of the resistor R9 is electrically connected to the negative input terminal of the operational amplifier U1A, one end of a capacitor C1, and the first input terminal of a comparator. The other end of the capacitor C1 is grounded.

[0030] The positive feedback branch includes a feedback resistor R4. One end of the feedback resistor R4 is electrically connected to the output terminal of the operational amplifier U1A, and the other end of the feedback resistor R4 is electrically connected to the positive input terminal of the operational amplifier U1A.

[0031] The voltage divider network includes resistors R3 and R7. One end of resistor R3 and one end of resistor R7 are electrically connected to the signal input terminal, the other end of resistor R3 is electrically connected to the first voltage, and the other end of resistor R7 is grounded.

[0032] The sensor signal processing circuit also includes an output protection circuit, the input of which is connected to the output of the comparator, and the output of which is connected to the output of the sensor signal processing circuit.

[0033] The output protection circuit includes a resistor R11, and the output of the comparator is connected to the first voltage via the resistor R11.

[0034] The output protection circuit includes a clamping circuit, one end of which is connected to the output of the comparator, and the other end of which is grounded.

[0035] The output protection circuit includes a current-limiting resistor R16. One end of the current-limiting resistor R16 is connected to the output of the comparator, and the other end of the current-limiting resistor R16 is connected to the output of the sensor signal processing circuit.

[0036] The present invention provides an electronic braking system, including a braking control unit and an electronic brake pedal as described above, wherein the electronic brake pedal is electrically connected to the braking control unit.

[0037] The processed standard voltage signal is transmitted to the ECU, which determines the braking intensity based on the signal amplitude; the ECU then controls the brake actuator to complete the braking action.

[0038] In some embodiments, the electronic brake pedal is provided with a main circuit and two sensors. The two sensors are electrically connected to the main circuit board. The main circuit board is used to output two digital signals that correspond one-to-one with the two sensors. The two digital signals are constantly added or subtracted to equal a fixed value. The brake control unit is used to receive the two digital signals and determine whether the constant addition or subtraction of the two digital signals equals a fixed value. If the constant addition or subtraction of the two digital signals does not equal a fixed value, an alarm is triggered or the backup circuit board is automatically switched.

[0039] The present invention provides a vehicle including the electronic braking system as described above.

[0040] The present invention has at least the following beneficial effects:

[0041] The structure of "the roller shaft of the pedal abutting against the sliding push assembly" in the present invention utilizes the rolling contact of the roller shaft and the sliding guidance of the push assembly to significantly reduce transmission friction, allowing the pedal action to be transmitted to the sensor more smoothly, improving the continuity of signal transmission, and enhancing the transmission stability and signal accuracy of the electronic brake pedal.

[0042] The present invention also integrates "an elastic element that provides a restoring force for the pushing component into the housing", which not only ensures the installation stability of the elastic element, but also makes the pedal return smoother and the reset more reliable through the sliding guide of the pushing component.

[0043] The sensor of this invention outputs an analog signal, which is relatively simple in type and its accuracy is affected by temperature and electromagnetic interference. After processing by the circuit board, it can output the required digital signal, and the temperature, electromagnetic and other factors have little impact on the accuracy of the processed signal.

[0044] The electronic brake pedal of this invention includes a main circuit and two sensors. The two sensors are electrically connected to the main circuit board, which outputs two digital signals corresponding one-to-one with each sensor. These two digital signals are constantly added to or subtracted to a fixed value. The brake control unit receives these two digital signals and determines whether their constant addition or subtraction equals the fixed value. If the two digital signals do not equal the fixed value, an alarm is triggered or a backup circuit board is automatically switched. This invention can determine circuit board malfunctions based on the two digital signals output by the circuit board. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of an electronic brake pedal provided in an embodiment of the present invention;

[0046] Figure 2 A cross-sectional view of an electronic brake pedal provided in an embodiment of the present invention;

[0047] Figure 3 A circuit diagram of a sensor signal processing circuit provided in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the sensor signal processing circuit provided in an embodiment of the present invention;

[0049] Figure 5 A circuit diagram of a power input protection circuit provided in an embodiment of the present invention;

[0050] Figure 6 The circuit diagram is provided for the reverse connection protection circuit in the embodiment of the present invention.

[0051] In the attached diagram, 1 is the pedal, 1-1 is the limiting protrusion, 2 is the pad, 3 is the roller, 4 is the pin, 5 is the movable sleeve, 6 is the pedal seat, 7 is the push plate, 8 is the bushing, 9 is the dust cover, 10 is the housing, 11 is the sensor cover, 12 is the socket, 13 is the circuit board, 14 is the elastic element, 15 is the sensor, 16 is the elastic element mounting base, 17 is the sensor mounting base, and 18 is the limiting bolt. Detailed Implementation

[0052] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. In the description of this invention, unless otherwise stated, "a plurality" or "several" means two or more. Similarly, "an," "a," or "the," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] In the various figures, the same elements are represented by similar reference numerals. For clarity, not all parts in the figures are drawn to scale. Furthermore, some well-known parts may not be shown in the figures.

[0055] Many specific details of the invention, such as the structure, materials, dimensions, processing methods, and techniques of the components, are described below to provide a clearer understanding of the invention. However, as those skilled in the art will understand, the invention may be implemented without following these specific details.

[0056] See Figure 1 and Figure 2 This invention discloses an electronic brake pedal, including a pedal 1, a pedal seat 6, and a housing 10. The pedal 1 is rotatably supported on the pedal seat 6 by a pin 4. The pedal seat 6 is provided with a mounting hole, and a pushing component is slidably fitted in the mounting hole. A roller 3 is fixed on the pedal, and the roller 3 abuts against the upper end of the pushing component. The housing 10 is located at the lower end of the pedal seat 6, and a sensor 15 and an elastic element 14 for providing a reset force for the pushing component are provided inside the housing 10.

[0057] The roller 3 is fixedly mounted on the pad 2, the pad 2 is fixedly connected to the pedal 1, and the pad 2 is rotatably supported on the pedal seat 6 by the pin 4.

[0058] In some embodiments, a limiting protrusion 1-1 is provided on the lower surface of the pedal, and a limiting bolt 18 is threadedly connected to the pedal seat 6. When the elastic element 14 is in the initial state, the limiting protrusion 1-1 can abut against the top of the limiting bolt 18.

[0059] In some embodiments, one end of the elastic member 14 abuts against the lower end of the pushing assembly, and the other end of the elastic member 14 abuts against the housing 10.

[0060] In some embodiments, the lower end of the pushing component extends into the housing 10, and the lower end of the pushing component slides into the housing 10. An elastic element mounting seat 16 is fixedly installed inside the housing 10. When the elastic element is in the initial state, there is a gap between the elastic element mounting seat 16 and the pushing component, and there is a gap between the pushing component and the sensor 15.

[0061] In some embodiments, the elastic element is a spring.

[0062] In some embodiments, the elastic element mounting base 16 is provided with a first groove for receiving the lower end of the elastic element, and the bottom of the first groove of the elastic element mounting base 16 is provided with a through hole for the sensor 15 or the sensor mounting base 17 to pass through.

[0063] The sensor 15 is fixed on the sensor mounting base 17, the sensor mounting base 17 is fixed on the housing 10, and the sensor 15 is located inside the spring.

[0064] When the spring is in its initial state, it pushes the component to remain in the preset initial position.

[0065] In some embodiments, the pushing assembly includes a pusher plate 7 and a movable sleeve 5. The upper end of the movable sleeve 5 is closed, and the lower end of the movable sleeve 5 is open. The upper end of the movable sleeve 5 extends outward from the mounting hole of the pedal seat 6 and contacts the roller shaft 3. The outer wall of the lower end of the movable sleeve 5 is in clearance fit with the mounting hole of the pedal seat 6. The upper end of the pusher plate 7 is fitted inside the movable sleeve 5, and the lower end of the pusher plate 7 is in clearance fit with the inner cavity of the housing 10.

[0066] The lower end face of the pusher 7 is provided with a second groove for accommodating the upper end of the elastic element.

[0067] The lower outer diameter of the push plate 7 is larger than the upper outer diameter of the push plate 7, and the lower outer diameter of the push plate 7 is larger than the diameter of the mounting hole of the pedal seat 6.

[0068] A bushing 8 is fixed inside the mounting hole of the pedal seat 6, and the pushing component is clearance-fitted with the bushing 8. The bushing 8 is interference-fitted with the mounting hole of the pedal seat 6.

[0069] The upper end of the mounting hole of the pedal seat 6 is provided with a dust cover 9, which is located between the pedal seat 6 and the push assembly.

[0070] In some embodiments, the dust cover 9 is a rubber dust cover 9.

[0071] The working principle of this invention is as follows:

[0072] The pedal seat 6 is fixed to the cab by bolts. When the driver needs to brake, he presses the pedal, which rotates around the pin 4, simultaneously causing the roller 3 to move downwards and pushing the movable sleeve 5 to move linearly downwards (the movable sleeve 5 and the bushing 8 store grease, and the bushing 8 is press-fitted onto the pedal seat 6). The downward movement of the movable sleeve 5 causes the push plate 7 to move downwards, which compresses the return spring. At the same time, due to contact with the sensor, the push plate 7 compresses the sensor. The sensor outputs an electrical signal to the circuit board 13. After being processed by the circuit board 13, the electrical signal is output to the vehicle ECU through the socket 12. The ECU calculates the received brake pedal and vehicle sensor signals and controls the wheel-side braking system to operate, thus performing braking.

[0073] Releasing the brake pedal releases the brakes, the return spring resets, and the pedal, sensor, and other components return to their initial state under the spring's force. The ECU then outputs a signal to release the wheel-side brakes. The push plate 7 and the elastic element mounting base 16 are dimensionally designed with a limit function to prevent excessive pedal travel and protect the sensor from exceeding its maximum range, which could lead to failure or damage. The lower end of the sensor mounting base 17 has a threaded structure, facilitating adjustment of the sensor's mounting position and the signal output value during assembly. The bushing 8 has a grease reservoir and a clearance fit with the movable sleeve 5, guiding the movable sleeve 5 and the push plate 7 to ensure their vertical sliding and thus accurate sensor output signals. The socket 12 and circuit board 13 are fixed to the cover plate and then to the housing 10 with screws, resulting in a compact structure.

[0074] In some embodiments, the electronic brake pedal of the present invention further includes a circuit board 13, the sensor being electrically connected to the circuit board 13, the circuit board 13 being provided with a power supply circuit and a sensor signal processing circuit, the power supply circuit being used to supply power to the sensor signal processing circuit and the sensor, and the sensor signal processing circuit being configured to convert the displacement signal output by the sensor into a digital signal.

[0075] In some embodiments, the electronic brake pedal of the present invention further includes a sensor cover plate 11, the side wall of the housing 10 is provided with an electrical mounting groove, the circuit board 13 is located in the electrical mounting groove, the sensor cover plate 11 is fixed in the electrical mounting groove, and a socket 12 for electrical connection with the brake control unit is fixedly installed on the sensor cover plate 11.

[0076] The circuit board 13 is fixedly connected to the sensor cover plate 11.

[0077] The housing 10 contains two sensors.

[0078] The housing 10 contains two circuit boards 13.

[0079] In some embodiments, see Figure 3 and Figure 4 The sensor signal processing circuit includes a triangular wave signal generation circuit and a comparator. The first input terminal of the comparator is electrically connected to the output terminal of the triangular wave signal generation circuit, and the second input terminal of the comparator is electrically connected to the sensor interface. The sensor interface is electrically connected to the sensor. The comparator is used to receive the triangular waveform output by the triangular wave signal generation circuit and the DC voltage signal corresponding to the displacement of the sensor, compare the triangular waveform with the DC voltage signal, and output a PWM signal.

[0080] The sensor monitors displacement changes and outputs a voltage signal. The circuitry on the circuit board then converts the voltage signal into a PWM signal for output. The sensor interface is a connector.

[0081] The triangular wave signal generating circuit consists of a hysteresis comparator and an RC charging and discharging circuit, and is used to output a periodic triangular wave signal.

[0082] The triangular wave signal generating circuit includes an operational amplifier U1A. The positive input terminal of the operational amplifier U1A is electrically connected to the power supply voltage divider node of the voltage divider network. The output terminal of the operational amplifier U1A is electrically connected to the positive input terminal of the operational amplifier U1A via a positive feedback branch. The output terminal of the operational amplifier U1A is electrically connected to a first voltage via a resistor R1. The output terminal of the operational amplifier U1A is electrically connected to one end of a resistor R9. The other end of the resistor R9 is electrically connected to the negative input terminal of the operational amplifier U1A, one end of a capacitor C1, and the first input terminal of a comparator. The other end of the capacitor C1 is grounded.

[0083] The positive feedback branch includes a feedback resistor R4. One end of the feedback resistor R4 is electrically connected to the output terminal of the operational amplifier U1A, and the other end of the feedback resistor R4 is electrically connected to the positive input terminal of the operational amplifier U1A.

[0084] The voltage divider network includes resistors R3 and R7. One end of resistor R3 and one end of resistor R7 are electrically connected to the signal input terminal, the other end of resistor R3 is electrically connected to the first voltage, and the other end of resistor R7 is grounded.

[0085] The inverting input of op-amp U1A is connected to an RC charging circuit. The RC charging time is determined by the resistance and capacitance values ​​of the components in the circuit. The positive input of op-amp U1A is connected to the power supply voltage divider input, and the output is positively fed back to the positive input, forming a hysteresis comparator. The hysteresis comparator generates two different threshold voltages based on the resistor selection: an upper threshold voltage and a lower threshold voltage. These two voltages, along with the RC charging and discharging circuit, produce a triangular waveform. The frequency of the triangular waveform is determined by the resistance and capacitance values ​​of the RC circuit, and also by the frequency of the PWM output.

[0086] The sensor signal processing circuit also includes an output protection circuit, the input of which is connected to the output of the comparator, and the output of which is connected to the output of the sensor signal processing circuit.

[0087] In some embodiments, the output protection circuit includes a resistor R11, and the output of the comparator is connected to a first voltage via the resistor R11.

[0088] In some embodiments, the output protection circuit further includes a clamping circuit, one end of which is connected to the output of the comparator, and the other end of which is grounded.

[0089] In some embodiments, the output protection circuit further includes a current-limiting resistor R16, one end of which is connected to the output of the comparator, and the other end of which is connected to the output of the sensor signal processing circuit.

[0090] In some embodiments, the comparator includes an operational amplifier U1B.

[0091] In some embodiments, the comparator further includes a voltage divider circuit, with the sensor connected to the voltage divider circuit and the sensor's center tap (displacement detection terminal) directly connected to the comparator's negative input terminal. In this case, changes in the sensor's displacement will directly alter the voltage divider value.

[0092] In some embodiments, the voltage divider circuit includes resistors R18 and R13. One pin of the sensor is electrically connected to the first voltage VCC via resistor R18, and the middle tap (displacement detection end) of the sensor is grounded via resistor R13.

[0093] In some embodiments, a capacitor is connected in parallel across the resistor R13.

[0094] In some embodiments, the sensor is connected to the negative input terminal of operational amplifier U1B via a voltage divider. The positive input terminal of operational amplifier U1B is connected to a triangular wave signal generated by a triangular wave signal generation circuit. Changes in the sensor position will generate continuous voltage changes. Each voltage change is compared with the triangular waveform, and the comparator outputs a PWM square wave signal. The duty cycle of this PWM square wave signal is determined by the changing voltage value.

[0095] In some embodiments, participate Figure 5The power supply circuit includes a power protection circuit, which in turn includes a second clamping circuit. One end of the second clamping circuit is connected to the power supply VCC, and the other end is grounded. Both the first and second clamping circuits consist of a Zener diode and a bidirectional TVS diode, used to prevent damage to downstream circuits from excessively high power supply voltage or transient spikes. When VCC experiences a sustained high voltage (such as a voltage rise caused by a power supply fault), the Zener diode is responsible for voltage regulation and clamping; when VCC experiences a momentary voltage spike (such as external interference or electrostatic discharge), the bidirectional TVS diode is responsible for rapid suppression.

[0096] In some embodiments, participate Figure 6 The power supply circuit includes a reverse connection protection circuit, which includes a MOSFET Q3. The source of MOSFET Q3 is connected to GND, and the drain of MOSFET Q3 is connected to PGND, thus establishing a current return path for the power supply. The base of MOSFET Q3 is connected to the power supply voltage VCC (e.g., 5V) via resistor R17. A TVS diode is placed between the base and source of MOSFET Q3. The TVS diode is used to protect the MOSFET from electrostatic damage. After power-on, the gate (pin 1) and source (pin 2) of the MOSFET are equal to 5V, the MOSFET is turned on, and current flows from pin 2 to pin 3 of the MOSFET.

[0097] The core of the reverse connection protection circuit is to use the N-channel MOSFET Q3 to disconnect the circuit when the positive and negative terminals of the power supply are reversed. The specific logic is as follows: MOSFET Q3 is the key to reverse connection protection. Its conduction / cutoff is controlled by the gate-source voltage (Vgs); R17 is the gate bias resistor, which is used to stabilize the gate voltage and ensure the reliable switching of the MOSFET.

[0098] With the power supply terminals correctly connected (VCC is positive and GND is negative): the gate is connected to VCC (positive) via R17, and the source is connected to GND (negative). When the gate-source voltage Vgs is greater than the MOSFET's turn-on threshold, the MOSFET is turned on, and the current can flow normally through the subsequent circuit to achieve power supply.

[0099] When the power supply polarity is reversed (VCC is negative and GND is positive): the gate-source voltage Vgs < 0 (the conduction condition is not met), the MOSFET is cut off; at the same time, the body diode built into the MOSFET is in a reverse bias state and cannot conduct, so the power supply circuit is disconnected and the subsequent circuit will not be damaged due to the reverse connection.

[0100] The advantage of this circuit is that the forward voltage drop during reverse connection protection is much smaller than that of traditional diode reverse connection protection circuits, making it more suitable for low-power, high-current power supply scenarios.

[0101] This invention provides a novel EMB-controlled electronic brake pedal, an upgrade from traditional pneumatic brakes. The invention employs a dual-signal redundancy design; when one sensor fails, the other continues to operate, ensuring normal braking. Furthermore, the dual signals are correlated, providing a self-diagnostic function.

[0102] Based on the same inventive concept, the present invention provides an electronic braking system, including a braking control unit and an electronic brake pedal as described above, wherein the electronic brake pedal is electrically connected to the braking control unit.

[0103] The processed standard voltage signal is transmitted to the ECU, which determines the braking intensity based on the signal amplitude; the ECU then controls the brake actuator to complete the braking action.

[0104] The electronic brake pedal can be any of the electronic brake pedals provided in the previous embodiments; for details, please refer to the contents of the previous embodiments, which will not be repeated here.

[0105] In some embodiments, the electronic brake pedal is provided with a main circuit and two sensors. The two sensors are electrically connected to the main circuit board. The main circuit board is used to output two digital signals that correspond one-to-one with the two sensors. The two digital signals are constantly added or subtracted to equal a fixed value. The brake control unit is used to receive the two digital signals and determine whether the constant addition or subtraction of the two digital signals equals a fixed value. If the constant addition or subtraction of the two digital signals does not equal a fixed value, an alarm is triggered or the backup circuit board is automatically switched.

[0106] In some embodiments, the electronic brake pedal contains two sensors and two circuit boards.

[0107] The sensor monitors the pedal's depressor angle and outputs a signal to the circuit board. The circuit board powers the sensor, receives the signal, processes it, and sends the data to the external system (EMB ECU). The circuit board includes voltage regulation and protection circuits to protect both the circuit board and the sensor. The sensor output is an analog signal, which is relatively simple and susceptible to temperature and electromagnetic interference, affecting its accuracy. After processing by the circuit board, it can output any desired digital signal (the circuit diagram shows a PWM signal), and temperature and electromagnetic interference have minimal impact on the accuracy of the processed signal. When the pedal is in operation, both sensors work, but only one circuit board operates. The circuit board consists of a main board and a backup board. The main board connects to the EMB main ECU, and the backup board connects to the EMB backup ECU. These two boards are powered and operate independently, never working together. Each sensor has two sets of wiring: one to the main board and the other to the backup board. These wirings include power, ground, and signal lines. This means that the sensors can communicate with both the main circuit board and the backup circuit board. When the main circuit board or the EMB main ECU fails, the backup circuit board and the EMB backup ECU take over. Each circuit board outputs two sets of digital signals, which are derived from processing the signals from the two sensors: sensor 1 corresponds to digital signal 1, and sensor 2 corresponds to digital signal 2. The two digital signals output by the circuit board meet the conditions for system self-calibration, namely, constant addition equal to a fixed value, or constant subtraction equal to a fixed value (the circuit diagram shows a constant addition equal to 100%). The EMB ECU processes and judges these two signals in real time. If the constant addition or subtraction does not equal a fixed value, the system automatically alarms or automatically switches to the backup circuit board.

[0108] Of the two digital signals output by the circuit board, the signal from sensor 1 is used first to control vehicle braking. Sensor signal 2 is used for redundancy; if sensor signal 1 fails, signal 2 will be used as a replacement after system evaluation. During braking, the vehicle's deceleration should be consistent at a given pedal angle. Based on this condition, the condition of the internal sensors in the brake pedal is calibrated in reverse according to different vehicle braking decelerations.

[0109] Fault Example and Handling Method 1: The main circuit board is burned out or all the wiring harnesses of the main circuit board are broken. After the EMB main ECU recognizes this, it will automatically switch to the backup circuit board and the EMB backup ECU.

[0110] Fault Example and Handling Method 2: One signal is burned out on the main circuit board or one signal is broken in the main circuit board wiring harness. After the system switches to the backup circuit, the system still alarms. At this time, the specific sensor that is faulty is identified according to the correspondence between deceleration and pedal angle, and the normal sensor is used to control the vehicle braking.

[0111] Based on the same inventive concept, the present invention provides a vehicle including the electronic braking system as described above.

[0112] The electronic braking system can be any of the electronic braking systems provided in the preceding embodiments; for a detailed description, please refer to the contents of the preceding embodiments, which will not be repeated here.

[0113] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electronic brake pedal, characterized in that: The device includes a pedal, a pedal seat, and a housing. The pedal is rotatably supported on the pedal seat by a pin. The pedal seat has a mounting hole, in which a pushing component is slidably fitted. A roller is fixed on the pedal and abuts against the upper end of the pushing component. The housing is located at the lower end of the pedal seat and contains a sensor and an elastic element for providing a reset force to the pushing component.

2. The electronic brake pedal according to claim 1, characterized in that: One end of the elastic element abuts against the lower end of the pushing assembly, and the other end of the elastic element abuts against the housing; And / or, The lower end of the pushing component extends into the housing and slides with the housing. An elastic element mounting seat is fixedly installed inside the housing. When the elastic element is in the initial state, there is a gap between the elastic element mounting seat and the pushing component, and there is a gap between the pushing component and the sensor. And / or, The elastic element is a spring; And / or, The lower surface of the pedal is provided with a limit protrusion, and a limit bolt is threaded onto the pedal seat. When the elastic element is in the initial state, the limit protrusion can abut against the top of the limit bolt.

3. The electronic brake pedal according to claim 2, characterized in that: The elastic element mounting base is provided with a first groove for accommodating the lower end of the elastic element, and the bottom of the first groove of the elastic element mounting base is provided with a through hole for the sensor or sensor mounting base to pass through.

4. The electronic brake pedal according to claim 1, characterized in that: The pushing assembly includes a pusher plate and a movable sleeve. The upper end of the movable sleeve is closed, and the lower end of the movable sleeve is open. The upper end of the movable sleeve extends outward from the mounting hole of the pedal seat and contacts the roller shaft. The outer wall of the lower end of the movable sleeve is in clearance fit with the mounting hole of the pedal seat. The upper end of the pusher plate is fitted inside the movable sleeve, and the lower end of the pusher plate is in clearance fit with the inner cavity of the housing.

5. The electronic brake pedal according to claim 1, characterized in that: It also includes a circuit board, the sensor being electrically connected to the circuit board, the circuit board having a power supply circuit and a sensor signal processing circuit, the power supply circuit being used to power the sensor signal processing circuit and the sensor, and the sensor signal processing circuit being configured to convert the displacement signal output by the sensor into a digital signal.

6. The electronic brake pedal according to claim 5, characterized in that: It also includes a sensor cover plate, the side wall of the housing is provided with an electrical mounting groove, the circuit board is located in the electrical mounting groove, the sensor cover plate is fixed in the electrical mounting groove, and a socket for electrical connection with the brake control unit is fixedly installed on the sensor cover plate.

7. The electronic brake pedal according to claim 5, characterized in that: The sensor signal processing circuit includes a triangular wave signal generation circuit and a comparator. The first input terminal of the comparator is electrically connected to the output terminal of the triangular wave signal generation circuit, and the second input terminal of the comparator is electrically connected to the sensor. The comparator is used to receive the triangular waveform output by the triangular wave signal generation circuit and the DC voltage signal corresponding to the displacement of the sensor, compare the triangular waveform with the DC voltage signal, and output a PWM signal.

8. An electronic braking system, characterized in that: It includes a brake control unit and an electronic brake pedal as described in any one of claims 1 to 7, wherein the electronic brake pedal is electrically connected to the brake control unit.

9. The electronic braking system according to claim 8, characterized in that: The electronic brake pedal contains a main circuit and two sensors. The two sensors are electrically connected to the main circuit board. The main circuit board outputs two digital signals that correspond one-to-one with the two sensors. The two digital signals are constantly added or subtracted to equal a fixed value. The brake control unit receives the two digital signals and determines whether the constant addition or subtraction of the two digital signals equals a fixed value. If the constant addition or subtraction of the two digital signals does not equal a fixed value, an alarm is triggered or the backup circuit board is automatically switched.

10. A vehicle, characterized in that: Includes the electronic braking system as described in claim 9.

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