Hidden electronic brake pedal system

Abstract

The embodiment of the present application provides a concealable brake electronic pedal system, including: the brake fluid in the hydraulic master cylinder is extracted into the fluid storage chamber during the folding process of the brake pedal, generating negative pressure, driving the pedal push rod to retract, and causing the brake pedal to sink to a hidden position; the brake fluid in the hydraulic master cylinder is extracted from the fluid storage chamber during the unfolding process of the brake pedal, and pressed into the hydraulic master cylinder, so that the brake pedal is unfolded to an operable position; during the folding process or unfolding process of the brake pedal, the travel sensor and the pressure sensor are used to monitor in real time whether the brake pedal reaches the predetermined position, and a fault alarm signal is issued in an abnormal situation. The linkage between the brake electronic pedal and the automatic driving control system is realized to achieve the automatic adjustment function; the original brake electronic pedal sensor is used, and it stops automatically after reaching the preset position; and effective position monitoring and fault monitoring can be provided; the whole system has a higher degree of integration; and the degree of mass production is high.

Description

Technical Field

[0001] The present application relates to the field of vehicle braking technology, and in particular to a concealable electronic brake pedal system. Background Art

[0002] With the continuous advancement of automotive electronic technology, traditional mechanical systems are gradually being replaced by electronic components. "Wire control technology" uses precise electronic sensors and actuators to replace traditional mechanical connections. When this control method is applied to car driving, it forms automotive wire control technology. As an important part of it, the brake-by-wire system not only meets the requirements of braking performance, but also pursues high efficiency, reliability and integration. In this system, the brake pedal is connected to the brake system through a position sensor, and there is no rigid or hydraulic connection between the pedal and the brake system. This is one of the key changes in wire control brake technology. However, the electronic pedals on the current market usually protrude from the interior of the vehicle under normal circumstances and are located at the foot position that is easy for the driver to touch.

[0003] As the demand for space and driving comfort of autonomous driving vehicles increases, the brake pedal in autonomous driving mode needs to be hidden to adapt to the space and comfort requirements in autonomous driving mode and improve the safety of autonomous driving.

[0004] However, the existing electronic brake pedal cannot meet the space requirements of autonomous vehicles, especially in autonomous driving mode, where the pedal needs to be hidden. This application aims to solve the problem of how to hide the electronic pedal in autonomous driving conditions and ensure that the electronic pedal can be quickly restored to an operable position when the driver needs it. Summary of the invention

[0005] The purpose of this application is to solve the problem in the prior art of how to hide the electronic pedal under autonomous driving conditions and ensure that the electronic pedal can be quickly restored to an operable position when the driver needs it. Therefore, this application provides a concealable brake electronic pedal system, which can realize the brake pedal can be folded and hidden in the autonomous driving mode, saving space in the vehicle, adapting to the needs of autonomous driving vehicles, and improving comfort and safety.

[0006] The embodiment of the present application provides a concealable electronic brake pedal system, comprising: an autonomous driving domain controller, a brake domain controller, and an electronic brake pedal;

[0007] The autonomous driving domain controller is used to receive the driver's instructions to activate or exit the autonomous driving system and control the vehicle's autonomous driving state;

[0008] A brake domain controller, used to control the folding and unfolding of the brake electronic pedal according to the instructions of the autonomous driving domain controller;

[0009] The electronic brake pedal is used to work with the autonomous driving system to fold and unfold the brake pedal;

[0010] The electronic brake pedal includes: a brake pedal, a pedal push rod, a hydraulic master cylinder, a travel sensor, a pressure sensor, a pedal feel simulator, a solenoid valve, a motor, a hydraulic pump and a fluid storage chamber;

[0011] The pedal push rod is connected to the brake pedal and is used to transmit the driver's operating force when the driver operates the brake pedal;

[0012] A hydraulic master cylinder, connected to the pedal push rod, is used to generate brake fluid pressure;

[0013] A travel sensor, used to monitor the travel of the piston in the hydraulic master cylinder in real time to determine whether the brake pedal is folded or unfolded to a preset position, the preset position indicating the hidden position after folding or the operable position after unfolding of the brake pedal;

[0014] Pressure sensor, used to monitor the brake fluid pressure in the hydraulic master cylinder in real time to ensure the folding and unfolding of the brake pedal;

[0015] Pedal feel simulator, used to simulate the feel of the brake pedal;

[0016] Solenoid valve, used to adjust the hydraulic flow between the hydraulic master cylinder and the hydraulic pump to achieve the folding and unfolding of the brake pedal;

[0017] A motor for driving a hydraulic pump;

[0018] A hydraulic pump, used to adjust the amount of brake fluid in the hydraulic master cylinder;

[0019] The fluid reservoir is used to store brake fluid drawn by the hydraulic master cylinder.

[0020] The brake fluid in the hydraulic master cylinder is drawn into the fluid storage chamber during the folding process of the brake pedal, generating negative pressure, which drives the pedal push rod to retract, causing the brake pedal to sink to a hidden position;

[0021] During the deployment of the brake pedal, the brake fluid in the hydraulic master cylinder is extracted from the fluid storage chamber and pressed into the hydraulic master cylinder, pushing the piston and pedal push rod in the hydraulic master cylinder outward, so that the brake pedal is deployed to an operable position;

[0022] The brake domain controller monitors in real time whether the brake pedal reaches the predetermined position through the travel sensor and pressure sensor during the folding or unfolding process of the brake pedal, and sends a fault alarm signal under abnormal circumstances.

[0023] In some embodiments, the pressure sensor and the travel sensor transmit signals to the brake domain controller;

[0024] The pressure sensor is used to monitor the brake fluid pressure in the hydraulic master cylinder and cooperate with the stroke sensor signal to determine whether the brake pedal is folded or unfolded to the predetermined position.

[0025] In some embodiments, when the folding process or the unfolding process of the brake pedal exceeds a preset time or fails to reach a preset position, a fault alarm signal is issued.

[0026] In some embodiments, the folding process of the brake pedal includes: when the vehicle enters the automatic driving state, the brake domain controller controls the solenoid valve to connect the hydraulic master cylinder and the hydraulic pump, and drives the motor to rotate in the opposite direction, and the motor drives the hydraulic pump to extract the brake fluid in the hydraulic master cylinder and store it in the liquid storage chamber;

[0027] As the brake fluid in the hydraulic master cylinder is pumped out, negative pressure is generated in the hydraulic master cylinder. The piston of the hydraulic master cylinder will drive the pedal push rod to contract, thereby driving the brake pedal to sink to a hidden position.

[0028] In some embodiments, the brake domain controller determines whether the brake pedal is folded to the hidden position based on the brake fluid pressure in the hydraulic master cylinder and the movement stroke of the piston in the hydraulic master cylinder;

[0029] When it is determined that the vehicle is folded to the hidden position, the brake domain controller stops driving the motor and the solenoid valve.

[0030] In some embodiments, the deployment process of the brake pedal includes: when the vehicle exits the automatic driving state, the brake domain controller controls the solenoid valve to connect the hydraulic master cylinder and the hydraulic pump, and drives the motor to rotate forward, and the motor drives the hydraulic pump to extract the brake fluid in the liquid storage chamber and press it into the hydraulic master cylinder;

[0031] As the brake fluid is pressed into the hydraulic master cylinder, the brake fluid pressure in the hydraulic master cylinder will push the piston to move and simultaneously push the pedal push rod outward, so that the brake pedal is pushed out to reach an operable position.

[0032] In some embodiments, the brake domain controller determines whether the brake pedal is deployed to the operable position by the brake fluid pressure in the hydraulic master cylinder and the movement stroke of the piston in the hydraulic master cylinder;

[0033] When it is determined that the vehicle is deployed to the operable position, the brake domain controller stops driving the motor and the solenoid valve.

[0034] In some embodiments, the piston in the hydraulic master cylinder is set to have a travel distance of 0 mm when at the bottom of the hydraulic master cylinder and a travel distance of 20 mm at the top of the hydraulic master cylinder;

[0035] When the travel sensor detects a movement travel less than or equal to 5 mm, and the pressure sensor detects a brake fluid pressure value less than or equal to 0.5 bar, it is determined that the brake pedal is folded to the hidden position.

[0036] In some embodiments, when the travel sensor detects a movement travel of 15 mm±1 mm, and the pressure sensor detects a pressure value of 1 bar±0.5 bar, it is determined that the brake pedal is deployed to the operable position.

[0037] In some embodiments, the preset time is 10 seconds; when the folding process exceeds the preset time and the brake pedal is not folded to the hidden position, it is determined that the folding has failed and a fault alarm signal is issued;

[0038] When the deployment process exceeds the preset time and the brake pedal is not deployed to the operable position, the deployment is judged to have failed and a fault alarm signal is issued;

[0039] When the pressure value collected by the pressure sensor is greater than or equal to 2 bar, or less than or equal to -2 bar, and the travel sensor collects a moving stroke between 6mm and 13mm, and the moving stroke does not change for more than 2 seconds, the brake pedal is judged to be stuck and a fault alarm signal is issued.

[0040] The embodiment of the present application provides a concealable electronic brake pedal system, including a brake pedal, a pedal push rod, a hydraulic master cylinder, a travel sensor, a pressure sensor, a pedal feel simulator, a solenoid valve, a motor, a hydraulic pump and a fluid storage chamber; in the automatic driving mode, the automatic driving system adjusts the amount of brake fluid in the hydraulic master cylinder by driving the motor and controlling the solenoid valve, generates negative pressure, drives the pedal push rod to retract, and causes the brake pedal to sink to a hidden position. When exiting the automatic driving mode, the automatic driving system is controlled to drive the motor and control the solenoid valve to inject brake fluid into the hydraulic master cylinder, push the pedal push rod outward, and cause the brake pedal to unfold to an operable position; and the folding and unfolding process is monitored and alarmed for preset positions and faults. In the automatic driving mode, the brake pedal can be folded and hidden, saving space in the vehicle and meeting the needs of the automatic driving vehicle; the folding and unfolding of the brake pedal can be automatically controlled according to the automatic driving state, improving the driving experience; and improving the safety of the automatic driving brake pedal folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a structural schematic diagram of a hidden electronic brake pedal according to an embodiment of the present application;

[0042] Figure 2 A schematic diagram of a folding process of a brake pedal according to an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the deployment process of the brake pedal according to an embodiment of the present application;

[0044] Figure 4 A schematic diagram of a travel sensor collecting a moving travel according to an embodiment of the present application;

[0045] Description of reference numerals:

[0046] 100, autonomous driving domain controller; 200, braking domain controller;

[0047] 300, electronic brake pedal;

[0048] 301, brake pedal; 302, pedal push rod; 303, piston; 304, hydraulic master cylinder; 305, pressure sensor; 306, travel sensor; 307, pedal feel simulator; 308, solenoid valve; 309, hydraulic pump; 310, motor; 311, liquid storage chamber;

[0049] 400. Central control touch screen; 500. Automatic driving button; a. High-speed bus. DETAILED DESCRIPTION

[0050] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0051] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0052] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In the description of the present application, it should be understood that in the present application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as a form in which different components in the circuit structure are connected through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals. "Coupled by..." can be understood as electrical conduction through air by indirect coupling. Indirect coupling can be understood as contactless coupling, in which, it can be understood by those skilled in the art that the coupling phenomenon refers to the phenomenon that there is close cooperation and mutual influence between the input and output of two or more circuit elements or electrical networks, and energy is transmitted from one side to the other through interaction. In order to make the purpose, technical solution and advantages of the present application clearer, the implementation method of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0055] With the development of automotive electronic technology, traditional mechanical systems are gradually replaced by electronic components, forming "wire control technology". This technology uses electronic sensors and actuators to replace mechanical systems. The brake-by-wire system makes the braking system more efficient, reliable and integrated. However, the existing electronic pedals are usually exposed in the cockpit under normal circumstances and cannot be combined with the autonomous driving system. They need to be hidden to save space.

[0056] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the concealable electronic brake pedal of the embodiment of the present application. The present application designs a human-computer interaction interface for the activation and exit conditions of autonomous driving; the electronic brake pedal is described in detail, which can be linked with the autonomous driving conditions to complete the folding and unfolding actions; and the folding and unfolding to the predetermined position are determined by checking the signals of two sensors.

[0057] like Figure 1 As shown, an embodiment of the present application provides a concealable brake electronic pedal system, including: an autonomous driving domain controller 100, a brake domain controller 200 and a brake electronic pedal 300.

[0058] Among them, the autonomous driving domain controller 100 is used to receive the driver's instructions to activate or exit the autonomous driving system and control the vehicle's autonomous driving state; the braking domain controller 200 is used to control the folding and unfolding of the brake electronic pedal 300 according to the instructions of the autonomous driving domain controller 100; the brake electronic pedal 300 is used to cooperate with the autonomous driving system to realize the folding and unfolding of the brake pedal 301.

[0059] Specifically, the autonomous driving human-computer interaction includes: an autonomous driving domain controller 100, a central control touch screen 400, an autonomous driving button 500, a braking domain controller 200 and a braking electronic pedal 300.

[0060] The autonomous driving domain controller 100 serves as the brain of autonomous driving. It receives the driver's intention to activate or exit autonomous driving. It collects the working status of systems such as sensors, computing units, and execution units in real time to determine whether the conditions for activating autonomous driving are met. When the activation conditions are met and the driver's activation intention is received, the autonomous driving domain controller 100 will enter the autonomous driving mode and display the current autonomous driving status through the instrument. When the activation conditions are not met, or the driver's intention to exit autonomous driving is received, the autonomous driving domain controller 100 will exit the autonomous driving mode and display the exit of autonomous driving through the instrument.

[0061] The driver can activate or exit the automatic driving mode by clicking the automatic driving activation / exit soft switch on the central control touch screen 400, or by using the automatic driving button 500 (physical button of automatic driving mode). For example, if the driver encounters an emergency driving condition and needs to quickly switch to the manual mode, the driver can press the automatic driving physical button 500 for a long time (recommended for more than 2 seconds) to exit the automatic driving mode.

[0062] In the embodiment of the present application, the autonomous driving domain controller 100, the braking domain controller 200 and the central control touch screen 400 are connected via a high-speed bus a.

[0063] The brake domain controller 200 is an execution unit of the autonomous driving and is also responsible for controlling the folding and unfolding of the brake electronic pedal 300. When entering the autonomous driving mode, the autonomous driving domain controller 100 will send a command to fold the brake pedal 301; after receiving the command, the brake domain controller 200 controls the motor 310 and the solenoid valve 308 in the brake electronic pedal 300 to complete the folding of the brake pedal 301; when exiting the autonomous driving mode, the autonomous driving domain controller 100 will send a command to unfold the brake pedal 301, and after receiving the command, the brake domain controller 200 controls the motor 310 and the solenoid valve 308 in the brake electronic pedal 300 to complete the unfolding of the brake pedal 301.

[0064] Furthermore, the electronic brake pedal 300 includes: a brake pedal 301 , a pedal push rod 302 , a piston 303 , a hydraulic master cylinder 304 , a stroke sensor 306 , a pressure sensor 305 , a pedal feel simulator 307 , a solenoid valve 308 , a motor 310 , a hydraulic pump 309 and a fluid storage chamber 311 .

[0065] Among them, the pedal push rod 302 is connected to the brake pedal 301, and is used to transmit the driver's operating force when the driver operates the brake pedal 301; the hydraulic master cylinder 304 is connected to the pedal push rod 302, and is used to generate brake fluid pressure; the stroke sensor 306 is used to monitor the moving stroke of the piston 303 in the hydraulic master cylinder 304 in real time to determine whether the brake pedal 301 is folded or unfolded to a preset position, and the preset position indicates the hidden position of the brake pedal 301 after folding or the operable position after unfolding; the pressure sensor 305, Used to monitor the brake fluid pressure in the hydraulic master cylinder 304 in real time to ensure the folding and unfolding of the brake pedal 301; the pedal feel simulator 307 is used to simulate the pedal feel of the brake pedal 301; the solenoid valve 308 is used to adjust the hydraulic flow between the hydraulic master cylinder 304 and the hydraulic pump 309 to achieve the folding and unfolding of the brake pedal 301; the motor 310 is used to drive the hydraulic pump 309; the hydraulic pump 309 is used to adjust the amount of brake fluid in the hydraulic master cylinder 304; the fluid storage chamber 311 is used to store the brake fluid extracted by the hydraulic master cylinder 304.

[0066] Specifically, the brake fluid in the hydraulic master cylinder 304 is drawn into the fluid storage chamber 311 during the folding process of the brake pedal 301, generating negative pressure, driving the pedal push rod 302 to contract, and causing the brake pedal 301 to sink to a hidden position; the brake fluid in the hydraulic master cylinder 304 is drawn from the fluid storage chamber 311 during the unfolding process of the brake pedal 301, pressed into the hydraulic master cylinder 304, pushing the piston 303 and the pedal push rod 302 in the hydraulic master cylinder 304 to move outward, so that the brake pedal 301 is unfolded to an operable position; the brake domain controller 200, during the folding process or unfolding process of the brake pedal 301, monitors in real time whether the brake pedal 301 has reached the predetermined position through the travel sensor 306 and the pressure sensor 305, and issues a fault alarm signal under abnormal circumstances.

[0067] In the embodiment of the present application, the pressure sensor 305 and the stroke sensor 306 transmit signals to the brake domain controller 200; the pressure sensor 305 is used to monitor the brake fluid pressure in the hydraulic master cylinder 304, and cooperates with the stroke sensor 306 signal to determine whether the brake pedal 301 is folded or unfolded to a predetermined position.

[0068] In some optional embodiments, Figure 2 Schematic diagram of the folding process of the brake pedal in the embodiment of the present application, as shown in Figure 2As shown, the straight arrow indicates the flow direction of the brake fluid, and the curved arrow indicates the reverse rotation direction of the motor 310. The folding process of the brake pedal 301 includes: when the vehicle enters the automatic driving state, the brake domain controller 200 controls the solenoid valve 308 to connect the hydraulic master cylinder 304 and the hydraulic pump 309, and drives the motor 310 to rotate in the reverse direction. The motor 310 drives the hydraulic pump 309 to extract the brake fluid in the hydraulic master cylinder 304 and store it in the liquid storage chamber 311; because the brake fluid in the hydraulic master cylinder 304 is extracted, a negative pressure is generated in the hydraulic master cylinder 304, and the piston 303 of the hydraulic master cylinder 304 drives the pedal push rod 302 to contract, thereby driving the brake pedal 301 to sink to reach the hidden position. The brake domain controller 200 determines whether the brake pedal 301 is folded to the hidden position by the brake fluid pressure in the hydraulic master cylinder 304 and the moving stroke of the piston 303 in the hydraulic master cylinder 304; when it is determined that it is folded to the hidden position, the brake domain controller 200 stops driving the motor 310 and the solenoid valve 308.

[0069] In some optional embodiments, Figure 3 Schematic diagram of the deployment process of the brake pedal in an embodiment of the present application, as shown in Figure 3 As shown, the straight arrow indicates the flow direction of the brake fluid, and the curved arrow indicates the deployment process of the brake pedal 301 in the forward rotation direction of the motor 310, including: when the vehicle exits the automatic driving state, the brake domain controller 200 controls the solenoid valve 308 to connect the hydraulic master cylinder 304 and the hydraulic pump 309, and drives the motor 310 to rotate forward at the same time, and the motor 310 drives the hydraulic pump 309 to extract the brake fluid in the reservoir 311 and press it into the hydraulic master cylinder 304; because the brake fluid is pressed into the hydraulic master cylinder 304, the brake fluid pressure in the hydraulic master cylinder 304 will push the piston 303 to move and push the pedal push rod 302 outward, so that the brake pedal 301 is pushed out to reach the operable position. The brake domain controller 200 determines whether the brake pedal 301 is deployed to the operable position by the brake fluid pressure in the hydraulic master cylinder 304 and the movement stroke of the piston 303 in the hydraulic master cylinder 304; when it is determined that it is deployed to the operable position, the brake domain controller 200 stops driving the motor 310 and the solenoid valve 308.

[0070] like Figure 2 and Figure 3 As shown, the detailed design of the brake electronic pedal 300 includes a brake pedal 301, a pedal push rod 302, a piston 303, a hydraulic master cylinder 304, a stroke sensor 306, a pressure sensor 305, a pedal feel simulator 307, a solenoid valve 308, a motor 310 and a hydraulic pump 309, and a fluid storage chamber 311.

[0071] The braking feeling simulation and sensor signal output in the embodiment of the present application are described as follows:

[0072] The driver steps on the brake pedal 301, which is connected to the pedal push rod 302, pushing the piston 303 to compress the brake fluid in the hydraulic master cylinder 304, and the brake fluid will flow to the pedal feel simulator 307, and the pedal feel of traditional brakes will be generated through the spring assembly of the pedal feel simulator 307. When the driver steps on the brake pedal 301, the travel sensor 306 will collect the movement travel of the piston 303, and the pressure sensor 305 will collect the brake fluid pressure in the hydraulic master cylinder 304; both sensors transmit signals to the brake domain controller 200.

[0073] like Figure 2 As shown, the folding and hiding process of the brake pedal 301 is as follows: when the vehicle enters the automatic driving mode, the brake domain controller 200 controls the solenoid valve 308 to connect the hydraulic master cylinder 304 and the hydraulic pump 309, and drives the motor 310 to rotate in the opposite direction. The motor 310 drives the hydraulic pump 309 to extract the brake fluid in the brake master cylinder and store it in the liquid storage chamber 311. At this time, since the brake fluid in the hydraulic master cylinder 304 is extracted, a negative pressure is generated in the hydraulic master cylinder 304, and the master cylinder piston 303 drives the pedal push rod 302 to contract, thereby driving the brake pedal 301 to sink and reach the hidden position. The brake domain controller 200 can determine whether the brake pedal 301 is folded to the hidden position by the master cylinder hydraulic pressure and the pedal stroke. When it is determined that the folding is in place, the brake domain controller 200 will stop driving the motor 310 and the solenoid valve 308.

[0074] like Figure 3 As shown, the extension process of the brake pressure plate is as follows: when exiting the automatic driving mode, the brake domain controller 200 will control the solenoid valve 308 to connect the hydraulic master cylinder 304 and the hydraulic pump 309, and drive the motor 310 to rotate forward at the same time. The motor 310 drives the hydraulic pump 309 to extract the brake fluid in the reservoir 311 and press it into the brake master cylinder. At this time, since the brake fluid is pressed into the hydraulic master cylinder 304, the brake fluid pressure in the hydraulic master cylinder 304 will push the piston 303 to move and push the pedal push rod 302 outward, so that the brake pedal 301 is pushed out to reach the operable position. The automatic driving control system can determine whether the brake pedal 301 is extended to the operable position by the master cylinder hydraulic pressure and the pedal stroke. When it is determined that it is extended to the right position, the brake domain controller 200 will stop driving the motor 310 and the solenoid valve 308.

[0075] On the basis of the above-mentioned embodiment, the embodiment of the present application can also determine whether the electronic brake pedal 300 reaches a preset position during the folding and unfolding process.

[0076] In some embodiments, Figure 4 This is a schematic diagram of the travel sensor collecting the moving travel in the embodiment of the present application, such as Figure 4As shown, the movement stroke of the piston 303 in the hydraulic master cylinder 304 at the bottom of the hydraulic master cylinder 304 is set to 0mm, and the movement stroke at the top of the hydraulic master cylinder 304 is 20mm, so the position of the intermediate value of 10mm can be obtained and scaled; when the movement stroke collected by the stroke sensor 306 is less than or equal to 5mm, and the pressure value of the brake fluid pressure collected by the pressure sensor 305 is less than or equal to 0.5bar, it is determined that the brake pedal 301 is folded to the hidden position. When the movement stroke collected by the stroke sensor 306 is 15mm±1mm, and the pressure value collected by the pressure sensor 305 is 1bar±0.5bar, it is determined that the brake pedal 301 is unfolded to the operable position.

[0077] Specifically, the electronic brake pedal 300 is equipped with a travel sensor 306 on the hydraulic master cylinder 304. When the pedal push rod 302 moves, the travel sensor 306 can collect the travel of the piston 303. The travel at the bottom of the hydraulic master cylinder 304 can be defined as 0 mm, and the travel at the top of the hydraulic master cylinder 304 can be defined as 20 mm. This travel is determined by the mechanical design of the hydraulic master cylinder 304. At the same time, a pressure sensor 305 is installed on the hydraulic master cylinder 304 to collect the internal pressure of the hydraulic master cylinder 304 in real time. When the hydraulic pump 309 draws the brake fluid from the hydraulic master cylinder 304, the pressure is a negative value; when the hydraulic pump 309 draws the brake fluid from the liquid storage chamber 311 and presses it into the hydraulic master cylinder 304, the pressure value is a positive number.

[0078] In the embodiment of the present application, when the folding process or the unfolding process of the brake pedal 301 exceeds a preset time or fails to reach a preset position, a fault alarm signal is issued.

[0079] In some optional embodiments, the preset time is 10 seconds; when the folding process exceeds the preset time and the brake pedal 301 is not folded to the hidden position, the folding is judged to have failed, and a fault alarm signal is issued; when the unfolding process exceeds the preset time and the brake pedal 301 is not unfolded to the operable position, the unfolding is judged to have failed, and a fault alarm signal is issued; when the pressure value collected by the pressure sensor 305 is greater than or equal to 2 bar, or less than or equal to -2 bar, and the stroke sensor 306 collects a moving stroke between 6 mm and 13 mm, and the moving stroke does not change for more than 2 seconds, it is judged that the brake pedal 301 is stuck, and a fault alarm signal is issued.

[0080] Specifically, through the real-time collection values ​​of the above two sensors (pressure sensor 305 and travel sensor 306), it is determined whether the brake pedal 301 is folded and unfolded to the preset position. If an abnormality occurs, a fault diagnosis alarm can be issued.

[0081] Folding reaches the preset position judgment:

[0082] When the collected value of the stroke sensor 306 is ≤5mm and the pressure value is ≤0.5bar, it is determined that the folding is in place. The above parameters can be adjusted according to specific projects.

[0083] Determine when the expansion reaches the preset position:

[0084] When the travel sensor collects a value of 15mm±1mm and the pressure value is 1bar±0.5bar, it is determined that the deployment is in place. The above parameters can be adjusted according to specific projects.

[0085] Other situations require fault identification and fault alarm signal issuance, for example:

[0086] If the folding process exceeds 10 seconds and the conditions for folding in place are not met, the folding is considered to have failed;

[0087] If the deployment process exceeds 10 seconds and the deployment conditions cannot be met, the deployment is considered failed;

[0088] When the pressure value collected by the pressure sensor 305 is ≥2 bar, or less than or equal to -2 bar, the value collected by the stroke sensor 306 is between 6 mm and 13 mm, and the moving stroke value does not change for more than 2 seconds; it is determined that the brake pedal 301 is stuck, and a fault diagnosis alarm is issued.

[0089] In the embodiment of the present application, more fault monitoring strategies can be customized according to needs.

[0090] In the concealable brake electronic pedal system provided in the embodiment of the present application, the brake electronic pedal 300 includes a brake pedal 301, a pedal push rod 302, a piston 303, a hydraulic master cylinder 304, a stroke sensor 306, a pressure sensor 305, a pedal feel simulator 307, a solenoid valve 308, a motor 310, a hydraulic pump 309 and a fluid storage chamber 311; in the automatic driving mode, by driving the motor 310 and controlling the solenoid valve 308, the amount of brake fluid in the hydraulic master cylinder 304 is adjusted to generate negative pressure, thereby driving the pedal push rod 302 to contract, so that the brake pedal 301 sinks to a hidden position. When exiting the automatic driving mode, the brake fluid is pumped into the hydraulic master cylinder 304 through the drive motor 310 and the control solenoid valve 308, pushing the pedal push rod 302 outward, so that the brake pedal 301 is deployed to an operable position; the brake electronic pedal and the automatic driving control system are linked to achieve the automatic adjustment function; the original brake electronic pedal sensor is still used, and it stops automatically after reaching the preset position; it can also provide effective position monitoring and fault monitoring; the entire system is more integrated; and it has a high degree of mass production.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and modifications of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and modifications.

Claims

1. A concealable electronic brake pedal system, characterized in that: include: Autonomous driving domain controller, brake domain controller and brake electronic pedal; The autonomous driving domain controller is used to receive the driver's instructions to activate or exit the autonomous driving system and control the vehicle's autonomous driving state; The brake domain controller is used to control the folding and unfolding of the brake electronic pedal according to the instruction of the autonomous driving domain controller; The electronic brake pedal is used to work in conjunction with the automatic driving system to achieve folding and unfolding of the brake pedal; The electronic brake pedal comprises: a brake pedal, a pedal push rod, a hydraulic master cylinder, a travel sensor, a pressure sensor, a pedal feel simulator, a solenoid valve, a motor, a hydraulic pump and a fluid storage chamber; The pedal push rod is connected to the brake pedal and is used to transmit the driver's operating force when the driver operates the brake pedal; The hydraulic master cylinder is connected to the pedal push rod and is used to generate brake fluid pressure; The travel sensor is used to monitor the movement travel of the piston in the hydraulic master cylinder in real time to determine whether the brake pedal is folded or unfolded to a preset position, wherein the preset position represents the hidden position after folding or the operable position after unfolding of the brake pedal; The pressure sensor is used to monitor the brake fluid pressure in the hydraulic master cylinder in real time to ensure the folding and unfolding of the brake pedal; The pedal feel simulator is used to simulate the pedal feel of the brake pedal; Solenoid valve, used to adjust the hydraulic flow between the hydraulic master cylinder and the hydraulic pump to achieve the folding and unfolding of the brake pedal; The motor is used to drive the hydraulic pump; The hydraulic pump is used to adjust the amount of brake fluid in the hydraulic master cylinder; The fluid storage chamber is used to store the brake fluid extracted by the hydraulic master cylinder; The brake fluid in the hydraulic master cylinder is drawn into the fluid storage chamber during the folding process of the brake pedal, generating negative pressure, driving the pedal push rod to contract, and causing the brake pedal to sink to the hidden position; During the deployment of the brake pedal, the brake fluid in the hydraulic master cylinder is extracted from the fluid storage chamber and pressed into the hydraulic master cylinder, pushing the piston in the hydraulic master cylinder and the pedal push rod outward, so that the brake pedal is deployed to the operable position; The brake domain controller monitors in real time whether the brake pedal reaches a predetermined position through the travel sensor and the pressure sensor during the folding or unfolding process of the brake pedal, and issues a fault alarm signal in an abnormal situation; When entering the automatic driving mode, the automatic driving domain controller will send a command to fold the brake pedal; when exiting the automatic driving mode, the automatic driving domain controller will send a command to unfold the brake pedal.

2. The concealable electronic brake pedal system according to claim 1, characterized in that: The pressure sensor and the travel sensor transmit signals to the brake domain controller; The pressure sensor is used to monitor the brake fluid pressure in the hydraulic master cylinder and to determine whether the brake pedal is folded or unfolded to the predetermined position in conjunction with the stroke sensor signal.

3. The concealable electronic brake pedal system according to claim 1, characterized in that: When the folding process or the unfolding process of the brake pedal exceeds the preset time or fails to reach the preset position, a fault alarm signal is issued.

4. The concealable electronic brake pedal system according to claim 1, characterized in that: The folding process of the brake pedal includes: When the vehicle enters the automatic driving state, the brake domain controller controls the solenoid valve to connect the hydraulic master cylinder and the hydraulic pump, and drives the motor to rotate in the opposite direction, so that the motor drives the hydraulic pump to extract the brake fluid in the hydraulic master cylinder and store it in the fluid storage chamber; As the brake fluid in the hydraulic master cylinder is drawn away, negative pressure is generated in the hydraulic master cylinder, and the piston of the hydraulic master cylinder drives the pedal push rod to contract, thereby driving the brake pedal to sink and reach the hidden position.

5. The concealable electronic brake pedal system according to claim 4, characterized in that: The brake domain controller determines whether the brake pedal is folded to the hidden position according to the brake fluid pressure in the hydraulic master cylinder and the movement stroke of the piston in the hydraulic master cylinder; When it is determined that the vehicle is folded to the hidden position, the brake domain controller stops driving the motor and the solenoid valve.

6. The concealable electronic brake pedal system according to claim 1, characterized in that: The deployment process of the brake pedal includes: When the vehicle exits the automatic driving state, the brake domain controller controls the solenoid valve to connect the hydraulic master cylinder and the hydraulic pump, and drives the motor to rotate forward, so that the motor drives the hydraulic pump to extract the brake fluid in the fluid storage chamber and press it into the hydraulic master cylinder; As the brake fluid is pressed into the hydraulic master cylinder, the brake fluid pressure in the hydraulic master cylinder will push the piston to move and simultaneously push the pedal push rod outward, so that the brake pedal is pushed out to reach the operable position.

7. The concealable electronic brake pedal system according to claim 6, characterized in that: The brake domain controller determines whether the brake pedal is deployed to the operable position according to the brake fluid pressure in the hydraulic master cylinder and the movement stroke of the piston in the hydraulic master cylinder; When it is determined that the brake domain controller is deployed to the operable position, the brake domain controller stops driving the motor and the solenoid valve.

8. The concealable electronic brake pedal system according to claim 3, characterized in that: Set the movement stroke of the piston in the hydraulic master cylinder to 0 mm when it is at the bottom of the hydraulic master cylinder and to 20 mm at the top of the hydraulic master cylinder; When the travel sensor detects that the movement travel is less than or equal to 5 mm, and the pressure sensor detects that the pressure value of the brake fluid pressure is less than or equal to 0.5 bar, it is determined that the brake pedal is folded to the hidden position.

9. The concealable electronic brake pedal system according to claim 8, characterized in that: When the travel sensor detects that the movement travel is 15 mm±1 mm, and the pressure sensor detects that the pressure value is 1 bar±0.5 bar, it is determined that the brake pedal is deployed to the operable position.

10. The concealable electronic brake pedal system according to claim 9, characterized in that: The preset time is 10 seconds; When the folding process exceeds the preset time and the brake pedal is not folded to the hidden position, it is determined that the folding has failed and a fault alarm signal is issued; When the deployment process exceeds the preset time and the brake pedal is not deployed to the operable position, it is determined that the deployment has failed and a fault alarm signal is issued; When the pressure value collected by the pressure sensor is greater than or equal to 2 bar, or less than or equal to -2 bar, and the travel sensor collects that the moving stroke is between 6 mm and 13 mm, and the moving stroke does not change for more than 2 seconds, it is determined that the brake pedal is stuck and a fault alarm signal is issued.

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