WO2019153307A1

WO2019153307A1 - Intelligent electric pedal control system for automobile

Info

Publication number: WO2019153307A1
Application number: PCT/CN2018/076331
Authority: WO
Inventors: 陈然
Original assignee: 陈武
Priority date: 2018-02-11
Filing date: 2018-02-11
Publication date: 2019-08-15

Abstract

An intelligent electric pedal control system for an automobile, comprising: a circuit board (1), a single-chip microcomputer (2) mounted on the circuit board (1), a CAN transceiver (3) connected to the single-chip microcomputer (2), and a field effect transistor drive circuit (4). The single-chip microcomputer (2) is connected to an OBD port of the automobile by means of the CAN transceiver (3) for obtaining a control signal, and controls an intelligent electric pedal motor by means of the field effect transistor drive circuit (4) to operate so that the intelligent electric pedal stretches out or retracts. Motor control signals are all received from an original automobile trip computer by means of an OBD port of an automobile, the original automobile line is not damaged, the control is safe and reliable, and it is convenient to install and use.

Description

Automobile intelligent electric foot control system

Technical field

The invention relates to the technical field of automobile parts, in particular to an intelligent electric foot control system for automobiles.

Background technique

With the improvement of people's living standards, cars have begun to spread in China, especially in recent years, off-road vehicles and SUVs have attracted more and more consumers. SUV-type cars, because of the high chassis, it is not convenient to get on and off, especially for ladies, the elderly and children. Therefore, most of them bring or install smart electric pedals to facilitate getting on and off. Traditional intelligent electric pedals are fixedly installed on On the car body, in order to facilitate getting on and off the car, it is lower than the original car chassis height, which reduces the vehicle's passability, and the smart electric pedals on both sides are stretched out, which is easy to generate wind noise.

In response to this problem, an electric intelligent electric pedal is developed in the industry to realize the automatic sunken extension when the door is opened, which is convenient for people to get on and off the vehicle. When the door is closed, it is automatically retracted and closely attached to the vehicle chassis without affecting the passing of the original vehicle. Sex and driving safety. However, the existing products and their control systems are controlled by signals such as door switches in the original automotive circuit. Therefore, when installing the products, a large number of automobile interior parts are to be disassembled, and the original vehicle circuit is modified. Due to construction site conditions, And the difference in the level of construction workers, it is easy to cause damage to the automotive interior parts. In addition, due to the modification of the original car circuit, the safety and reliability of the original car circuit may be damaged.

technical problem

In view of the problems existing in the prior art, an object of the present invention is to provide an intelligent electric foot control system for a vehicle that is safe and easy to install and use.

Technical solution

In order to achieve the above object, the present invention adopts the following technical solutions.

An intelligent electric foot control system for a vehicle, comprising: a circuit board, a single chip microcomputer mounted on the circuit board, and a CAN transceiver and a FET driving circuit connected to the single chip microcomputer, wherein the single chip microcomputer passes through The CAN transceiver is connected to the vehicle OBD interface to obtain a control signal, and the smart field foot motor is controlled by the FET driving circuit to realize the extension and retraction of the intelligent electric foot pedal.

As a further description of the above solution, connecting on the single chip microcomputer There is a manual debugging switch, and the debugging function after assembly is realized by the manual debugging switch.

Further explanation as the above scheme a temperature sensor is connected to the single chip, the temperature sensor is located in the same housing as the circuit board; when the temperature detected by the temperature sensor is ≥ the first set temperature, the single chip cuts off the control signal and enters a safe lock state. When the temperature detected by the temperature sensor is ≤ the second set temperature, the single chip microcomputer automatically resumes operation; the first set temperature > the second set temperature.

Further explanation as the above scheme An input voltage detecting circuit is connected to the single chip; when the input voltage ≥ the first set voltage is detected or the input voltage ≤ the third set voltage is detected, the single chip cuts off the control signal to enter a safe locked state to prevent damage. a motor and a driving device; when detecting that the input voltage ≤ the second set voltage or detecting that the input voltage rises to ≥ the fourth set voltage, the single chip microcomputer automatically resumes operation; the first set voltage > the second The set voltage > the fourth set voltage > the third set voltage.

Further explanation as the above scheme A driving self-test circuit is connected between the single chip microcomputer and the FET driving circuit; each time the motor is started, a self-test is performed, and if a driving abnormality is detected, the single chip cutting control signal enters a safety locked state.

Further explanation as the above scheme A hardware watchdog circuit is connected to the single chip microcomputer. When the single chip device fails to operate normally, the hardware watchdog circuit locks the working state of the single chip microcomputer.

Further explanation as the above scheme A CAN communication error correction unit is connected to the single chip microcomputer. When the CAN communication is abnormal, the single chip microcomputer cuts off the control signal and enters a safety lock state.

Further explanation as the above scheme The FET driving circuit has a soft start function; when the motor is blocked or shorted, the single chip cuts off the control signal to enter a safe lock state.

As a further explanation of the above scheme, after the vehicle is started, when the non-P and N files are engaged, the forced recovery is performed. Intelligent electric pedal; during the driving process, if the door is opened, the intelligent electric foot does not perform the extension action; after parking, when the P and N files are engaged, the door is opened to control the intelligent electric foot to extend.

As a further description of the above solution, in the process of extending the smart electric pedal, if an obstacle is encountered, it automatically retracts; When the intelligent electric pedal is retracted, if an obstacle is encountered, it automatically extends.

Beneficial effect

The beneficial effects of the invention are:

1. By connecting the CAN transceiver to the MCU, the control signal can be directly received from the original car through the OBD interface of the car. The driving computer does not damage the original car line, the control is safer and more reliable, and the installation and use are very convenient. In actual application, by remotely unlocking and locking the vehicle by key remote control, the smart electric pedals on the left and right sides can be extended and retracted.

Second, by connecting a manual debugging switch on the MCU, there is no need to start the car, and the OBD signal can be used for debugging after assembly.

Third, by setting the temperature sensor, it is convenient to carry out over-temperature protection, effectively avoiding the abnormality of the FET driving circuit and preventing damage to the motor and the driving device.

4. By setting the input voltage detection circuit for over-voltage protection and under-voltage protection, it can prevent damage to the motor and the drive device, prolong battery life and prevent accidental battery damage.

5. By setting the circuit between the drive, the CAN communication error correction unit and the watchdog circuit, it effectively avoids the loss of control of the motor and ensures the safety of driving.

6. Since the FET driving circuit has a soft start function; when the motor is blocked or short-circuited, the single-chip microcomputer cuts off the control signal into a safe locking state, thereby avoiding damage to the driving device and causing serious consequences to the entire vehicle circuit.

DRAWINGS

FIG. 1 is a schematic structural view of an automobile intelligent electric foot control system provided by the present invention.

Figure 2 shows the structure of the circuit board.

Figure 3 shows the circuit diagram of the MCU connection.

Figure 4 shows the CAN transceiver connection circuit diagram.

Figure 5 shows the FET drive circuit diagram.

Description of the reference signs:

1: circuit board, 2: single chip microcomputer, 3: CAN transceiver, 4: FET drive circuit, 5: housing.

Embodiments of the invention

In the description of the present invention, it should be noted that for the position word, if there is the term 'center', 'horizontal' , 'Portrait', 'Length', 'Width', 'Thickness', 'Up', 'Bottom', 'Front', 'Late', 'Left', 'Right', 'Vertical', 'Level', The orientations and positional relationships of 'top', 'bottom', 'inside', 'outside', 'clockwise', 'counterclockwise', etc. are based on the orientation or positional relationship shown in the drawings, for convenience of description of the present invention. The simplification of the present invention is not intended to limit the scope of the invention, and is not intended to limit the scope of the invention.

Furthermore, the terms 'first' and 'second' are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implied number of technical features. Thus, the definition of the 'first' and 'second' features may include or implicitly include one or more of the features. In the description of the invention, the meaning of 'at least' is one or more unless specifically stated otherwise Limited.

In the present invention, unless explicitly stated and defined, the terms 'assembled', 'connected', and 'connected' should be understood in a broad sense, for example, a fixed connection, a detachable connection, or an integral Ground connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, and the two elements can be connected internally. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the invention, the first feature may be included in the 'on' or 'under' of the second feature, and may include direct contact between the first feature and the second feature, and the first feature and the second feature may not be directly Contact is through contact with additional features between them. Moreover, the first feature 'above', 'below' and 'above' the second feature includes the first feature directly above and above the second feature, or merely indicates that the first feature level is higher than the second feature the height of. First feature in the second feature 'Below', 'below' and 'below' include that the first feature is directly below or below the second feature, or merely that the first feature is lower than the second feature.

The technical solutions of the present invention and the beneficial effects thereof will be more clearly and clarified by the following description of the embodiments of the present invention. The embodiments are described below by way of example only, and are not intended to be construed as limiting.

As shown in FIG. 1 to FIG. 5, an intelligent electric foot control system for a vehicle includes: a circuit board 1, a single chip microcomputer 2 mounted on the circuit board 1, and a CAN transceiver connected to the single chip microcomputer 2 The MOSFET 3 is driven by the CAN transceiver 3 to obtain a control signal through the CAN transceiver 3, and controls the operation of the intelligent electric foot motor through the FET driving circuit 4, thereby realizing The extension and retraction of the intelligent electric pedal.

Compared with the prior art, the embodiment adopts an advanced OBD interface mode (CAN bus communication), does not damage the original vehicle line, and the motor control signals are received from the original vehicle driving computer. The control is safer, more reliable, and easy to install and use.

The MCU 2 is preferably an STM32F072C8T series MCU, and the model of the CAN transceiver is preferably SN65HVD230. A manual debugging switch is connected to the single chip microcomputer 2, and the debugging function after assembly is realized by the manual debugging switch. No need to start the car, no need to debug the OBD signal.

Further, a temperature sensor is connected to the single chip microcomputer 2, and the temperature sensor is located in the same housing 5 as the circuit board 1. When the temperature detected by the temperature sensor is ≥ the first set temperature, the single chip microcomputer 2 The cut-off control signal enters a safe lock state, and when the temperature detected by the temperature sensor ≤ the second set temperature, the single-chip microcomputer 2 automatically resumes operation; the first set temperature > the second set temperature.

In this embodiment, it is preferable that the first set temperature is 90 ° C, and preferably the second set temperature is 70 ° C. In other embodiments, the first set temperature value and the second set temperature value may actually require an adjustment method, and are not limited to the embodiment. In this embodiment, by setting the over-temperature protection, the abnormality of the FET driving circuit can be effectively avoided, and the motor and the driving device can be prevented from being damaged.

Further, an input voltage detecting circuit is connected to the single chip microcomputer 2; when the input voltage ≥ the first set voltage is detected or the input voltage ≤ the third set voltage is detected, the single chip cutoff control signal enters a safe lock state. When the input voltage ≤ the second set voltage is detected or the input voltage is detected to rise to ≥ the fourth set voltage, the single chip microcomputer automatically resumes operation; the first set voltage > the second set voltage > The fourth set voltage > the third set voltage.

In this embodiment, the first voltage is preferably 19V, the second voltage is 18V, the third voltage is 8.5V, and the fourth power source is 10V. In other embodiments, each voltage value may actually require an adjustment method, and is not limited to the embodiment. In this embodiment, by setting the overvoltage protection, the motor and the driving device can be prevented from being damaged. By setting the low voltage protection, the battery life can be prolonged and the battery can be prevented from being accidentally damaged.

Further, a driving self-test circuit is connected between the single chip microcomputer 2 and the FET driving circuit 3; each time the motor is started, a self-test is performed, and if a driving abnormality is detected, such as a FET, the The single-chip microcomputer 2 cuts off the control signal and enters the safety lock state to prevent the motor from losing control.

Further, a hardware watchdog circuit is connected to the single chip microcomputer 2. When the single chip microcomputer 2 fails to operate normally, the hardware watchdog circuit locks the working state of the single chip microcomputer 2 to prevent the motor from losing control. The single chip microcomputer 2 is also connected with a standby management unit to automatically enter the standby mode to reduce power consumption, and the standby sleep current is less than 1 mA. The MCU 2 is also connected with an upgrade port to facilitate the upgrading and maintenance of the product by the manufacturer and the seller.

Further, a CAN communication error correction unit is connected to the single chip microcomputer 2. When an abnormality occurs in the CAN communication, the single chip microcomputer cuts off the control signal to enter a safety lock state, thereby preventing the motor from losing control.

Further, the FET driving circuit has a soft start function; when the motor is blocked or short-circuited, the single-chip microcomputer cuts off the control signal into a safe locking state, thereby avoiding damage to the driving device and causing serious consequences to the entire vehicle circuit.

The automobile intelligent electric foot control system provided by the embodiment provides a forced recovery of the intelligent electric pedal when the non-P gear (parking gear) and the N gear (neutral gear) are engaged after the vehicle is started by the built-in program of the single-chip microcomputer; During the driving process of the car, if the door is opened, the intelligent electric foot does not perform the extension action; after parking, when the P and N files are engaged, the door is opened to control the intelligent electric foot to extend to ensure safe driving. In particular, during the smart electric pedal extension process, if an obstacle is encountered, it automatically retracts; when the intelligent electric pedal is retracted, if an obstacle is encountered, it automatically extends; to achieve intelligent obstacle avoidance And to prevent accidental pinching.

The automobile intelligent electric foot control system provided by the embodiment is characterized in that the control signal is derived from the automobile OBD. In practical applications, by remotely unlocking and locking the vehicle by key remote control, the intelligent electric foot pedals on the left and right sides can be extended and retracted, which is very convenient to use.

Through the above description of the structure and principle, those skilled in the art should understand that the present invention is not limited to the specific embodiments described above, and that the improvements and substitutions well known in the art are based on the present invention. The scope of the invention is defined by the claims and their equivalents. Portions not described in the detailed description are prior art or common knowledge.

Claims

An intelligent electric foot control system for a vehicle, comprising: a circuit board, a single chip microcomputer mounted on the circuit board, and a CAN transceiver and a FET driving circuit connected to the single chip microcomputer, wherein the single chip microcomputer passes through The CAN transceiver is connected to the vehicle OBD interface to obtain a control signal, and the smart field foot motor is controlled by the FET driving circuit to realize the extension and retraction of the intelligent electric foot pedal.
The intelligent electric foot control system for an automobile according to claim 1, wherein a manual debugging switch is connected to the single chip microcomputer, and the debugging function after assembly is realized by the manual debugging switch.
The intelligent electric foot control system for an automobile according to claim 1, wherein a temperature sensor is connected to the single chip, the temperature sensor is located in the same casing as the circuit board; when the temperature sensor detects When the temperature is ≥ the first set temperature, the single-chip microcomputer cuts off the control signal to enter a safety lock state, and when the temperature detected by the temperature sensor ≤ the second set temperature, the single-chip microcomputer automatically resumes operation; the first set temperature > the second set temperature.
The intelligent electric foot control system for an automobile according to claim 1, wherein an input voltage detecting circuit is connected to the single chip; when an input voltage ≥ a first set voltage is detected or an input voltage is detected ≤ When the voltage is set third, the single chip cuts off the control signal to enter a safety lock state to prevent damage to the motor and the driving device; when detecting that the input voltage is ≤ the second set voltage or detecting that the input voltage rises to ≥ the fourth set voltage The single chip microcomputer automatically resumes operation; the first set voltage > the second set voltage > the fourth set voltage > the third set voltage.
The intelligent electric foot control system for an automobile according to claim 1, wherein a driving self-test circuit is connected between the single chip microcomputer and the FET driving circuit; Check that if a drive abnormality is detected, the MCU cuts off the control signal and enters a safe lock state.
The intelligent electric foot control system for an automobile according to claim 1, wherein a hardware watchdog circuit is connected to the single chip microcomputer, and when the single chip device fails to operate normally, the hardware gatekeeper The dog circuit locks the working state of the single chip microcomputer.
The intelligent electric foot control system for an automobile according to claim 1, wherein a CAN communication error correction unit is connected to the single chip microcomputer, and when the CAN communication is abnormal, the single chip microcomputer cuts off the control signal and enters a security lock. status.
The intelligent electric foot control system for an automobile according to claim 1, wherein the FET driving circuit has a soft start function; when the motor is blocked or shorted, the single chip cuts off the control signal. Enter the security lock state.
The intelligent electric foot control system for an automobile according to claim 1, wherein after the vehicle is started, when the non-P gear and the N gear are engaged, the smart electric pedal is forcibly retracted; Open the door, the intelligent electric foot does not perform the extension action; after parking, when the P and N files are hung, the door is opened to control the intelligent electric foot to extend.
The intelligent electric foot control system for an automobile according to claim 1, wherein in the process of extending the intelligent electric foot pedal, if an obstacle is encountered, the electric foot pedal is automatically extended; and the intelligent electric foot pedal is When retracted, If there is an obstacle, it will automatically extend.