Energy absorption type brake pedal simulation device and system

Abstract

The energy absorption type brake pedal simulation device comprises a brake pedal, a hydraulic oil cylinder, a high-speed switch valve and a hydraulic pump which are connected in sequence, the input end of the hydraulic oil cylinder is provided with a displacement sensor, and the output end of the hydraulic oil cylinder is provided with a pressure sensor; the simulation device electric control unit is respectively connected with the displacement sensor, the pressure sensor and the high-speed switch valve through hard wires, and is also connected with a collision sensor; when the brake pedal is treaded, the piston of the hydraulic oil cylinder is pushed to displace, the displacement sensor outputs a displacement signal to the simulation device electric control unit, and the pressure sensor outputs a pressure signal in the hydraulic oil cylinder to the simulation device electric control unit. When collision occurs, the collision sensor sends a collision signal to the simulation device electric control unit, the simulation device electric control unit controls the opening of the high-speed switch valve, pressure relief of the hydraulic oil cylinder, automatic collapse of the brake pedal and absorption of collision energy, and the right foot of a driver is prevented from being seriously injured.

Description

Technical Field

[0001] The present application relates to the field of wire-controlled brake systems for intelligent driving vehicles, and in particular to an energy-absorbing brake pedal simulation device and system. Background Art

[0002] With the rapid development of the new energy vehicle industry and the increasing popularity of advanced driver assistance systems, chassis-by-wire technology is placing higher demands on braking systems. This requirement aims to decouple brake pedal force from wheel-end braking force, ensuring good pedal feel for effective braking energy recovery. At the same time, high-precision and rapid braking response are also required to independently control four-wheel braking force, providing top-level passenger safety.

[0003] In-depth analysis of major traffic accident cases both domestically and internationally reveals that, at the critical moment of an accident, most drivers resort to emergency braking, slamming their right foot down on the brake pedal. However, this action transmits a significant impact force directly to the driver's right foot through the brake pedal at the moment of collision, often resulting in serious foot injuries.

[0004] Take, for example, an accident at an urban intersection where a car collided with an electric bike that ran a red light. During emergency braking, the car driver's right foot was strongly impacted by the brake pedal. Although not critically injured, in the chaos following the accident, the injured foot limited his mobility and prevented him from leaving the vehicle in time, nearly causing secondary injury. This case highlights that even in relatively slow-moving urban traffic, the potential risk of injury to the driver's feet from the brake pedal during emergency braking cannot be ignored. Unfortunately, the braking system designs of some vehicles currently do not adequately address this issue, lacking the necessary protective measures and energy absorption mechanisms. Summary of the Invention

[0005] An embodiment of the present application provides an energy-absorbing brake pedal simulation device to solve the problem in the related art that at the moment of vehicle collision, a strong impact force is transmitted to the driver's right foot through the brake pedal, causing serious injury to the right foot; at the same time, it also solves the problem that after a vehicle collision occurs, the vehicle slides freely under the action of inertia, causing the vehicle to collide with each other or other vehicles or objects again, causing further damage or loss.

[0006] In a first aspect, an energy-absorbing brake pedal simulation device is provided, comprising: A brake pedal, a hydraulic cylinder, a high-speed switch valve and a hydraulic pump are connected in sequence, wherein the input end of the hydraulic cylinder is provided with a displacement sensor, and the output end of the hydraulic cylinder is provided with a pressure sensor; an electronic control unit for the simulation device, the electronic control unit for the simulation device being connected to the displacement sensor, the pressure sensor and the high-speed switching valve respectively, and also being connected to a collision sensor; When the brake pedal is stepped on, the piston of the hydraulic cylinder is pushed to move, and the displacement sensor outputs a displacement signal to the electronic control unit of the simulation device, and the pressure sensor outputs a pressure signal in the hydraulic cylinder to the electronic control unit of the simulation device; During a collision, the collision sensor sends a collision signal to the simulation device electronic control unit, and the simulation device electronic control unit controls the opening of the high-speed switching valve to relieve pressure on the hydraulic cylinder.

[0007] In some embodiments, the simulation device electronic control unit is connected to an electronic stability control system ESC controller via a CAN line; When a collision occurs, the simulator electronic control unit sends a collision signal to the electronic stability control system (ESC) controller after a delay of T. The electronic stability control system (ESC) controller implements active braking after receiving the active braking signal.

[0008] In some embodiments, the delay time T is set to a value of 0.05s to 0.15s.

[0009] In some embodiments, the collision sensor comprises a front collision sensor disposed near a headlamp bracket at a front end of the vehicle.

[0010] In some embodiments, the collision sensor includes a side collision sensor disposed on the inner sides of the left and right fenders at the front end of the vehicle.

[0011] In some embodiments, the high-speed switching valve includes a drain valve and an inlet valve, and both the drain valve and the inlet valve are connected to the hydraulic cylinder via an oil pipe.

[0012] In some embodiments, the liquid inlet valve is connected to the hydraulic pump via an oil pipe, and the hydraulic pump is connected to a motor.

[0013] In some embodiments, the oil pipe is further provided with an overflow valve and an accumulator, and the overflow valve and the accumulator are arranged between the liquid inlet valve and the hydraulic pump.

[0014] In some embodiments, the hydraulic cylinder includes a cylinder body and a piston rod, a damping elastic element is provided in the cylinder body, and the brake pedal is connected to the piston rod via a connecting fork.

[0015] In some embodiments, the middle portion of the brake pedal is hinged to the hydraulic cylinder.

[0016] In a second aspect, an energy-absorbing brake pedal simulation system is provided, comprising the energy-absorbing brake pedal simulation device.

[0017] The present invention provides an energy-absorbing brake pedal simulator and system. The simulator's electronic control unit (ECU) calculates the brake pedal reaction force based on brake pedal displacement and hydraulic cylinder pressure. It rapidly adjusts a high-speed on-off valve to control the pressure within the hydraulic cylinder and adjust the output force of the hydraulic cylinder piston. A pressure sensor inputs the actual pressure within the hydraulic cylinder into the simulator's ECU, where it is compared with a desired target pressure, forming a closed-loop PID control system with feedback for accurate, real-time control of the hydraulic cylinder pressure. In the event of a collision, the collision sensor senses the intensity and direction of the collision and immediately sends a signal to the simulator's ECU. After receiving the signal from the front collision sensor, the ECU rapidly calculates and determines whether the vehicle's deceleration has reached a pre-set collision intensity threshold. The ECU then depressurizes the hydraulic cylinder, automatically collapsing the brake pedal and absorbing the collision energy, preventing serious injury to the driver's right foot. In the event of a collision, the ECU sends a collision signal to the electronic stability control (ESC) controller after a delay of T. The ESC controller then receives the active braking signal and applies active braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a system diagram of the energy-absorbing brake pedal simulation device provided in an embodiment of the present application.

[0020] In the figure: 1. Brake pedal; 2. Hydraulic cylinder; 201. Damping elastic element; 3. Displacement sensor; 4. Pressure sensor; 5. Simulation device electronic control unit; 6. Collision sensor; 7. Inlet valve; 8. Outlet valve; 9. Hydraulic pump; 10. Motor; 11. Overflow valve; 12. Accumulator; 13. Electronic Stability Control System (ESC) controller; 14. Oil pipe. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] An embodiment of the present application provides an energy-absorbing brake pedal simulation device, which can solve the problem in the related art that at the moment of vehicle collision, a strong impact force is transmitted to the driver's right foot through the brake pedal, causing serious injury to the right foot; at the same time, it also solves the problem that after a vehicle collision occurs, the vehicle slides freely under the action of inertia, causing the vehicle to collide with each other or other vehicles or objects again, causing further damage or loss.

[0023] like Figure 1 As shown, an energy-absorbing brake pedal simulation device comprises: The brake pedal 1, hydraulic cylinder 2, high-speed switch valve and hydraulic pump 9 are connected in sequence. The input end of the hydraulic cylinder 2 is provided with a displacement sensor 3, and the output end of the hydraulic cylinder 2 is provided with a pressure sensor 4; The simulation device electronic control unit 5 is connected to the displacement sensor 3, the pressure sensor 4 and the high-speed switch valve through hard wires, and is also connected to the collision sensor 6; When the brake pedal 1 is stepped on, the piston of the hydraulic cylinder 2 is pushed to move. The displacement sensor 3 outputs the displacement signal to the simulation device electronic control unit 5. The pressure sensor 4 outputs the pressure signal in the hydraulic cylinder 2 to the simulation device electronic control unit 5. When a collision occurs, the collision sensor 6 sends a collision signal to the simulation device electronic control unit 5 , and the simulation device electronic control unit 5 controls the opening of the high-speed switch valve to relieve the pressure of the hydraulic cylinder 2 .

[0024] The simulator's electronic control unit (ECU) 5 calculates the brake pedal's reaction force based on the displacement of the brake pedal 1 and the pressure in the hydraulic cylinder 2. It then rapidly adjusts the high-speed on-off valve to control the pressure within the hydraulic cylinder 2 and adjust the piston's output force. The pressure sensor 4 inputs the actual pressure within the hydraulic cylinder 2 into the simulator's ECU 5, where it compares it with the target pressure. This forms a closed-loop PID control system with feedback, enabling accurate, real-time control of the pressure in the hydraulic cylinder 2. In the event of a collision, the collision sensor 6 detects the intensity and direction of the collision and immediately sends a signal to the simulator's ECU 5. After receiving the signal from the front collision sensor 6, the ECU 5 rapidly calculates and determines that the vehicle's deceleration has reached the pre-set collision intensity threshold. The ECU then depressurizes the hydraulic cylinder 2, causing the brake pedal 1 to automatically collapse, absorbing the collision energy and preventing serious injury to the driver's right foot.

[0025] In some embodiments, the simulation device electronic control unit 5 is connected to the electronic stability control system ESC controller 13 via a CAN line; when a collision occurs, the simulation device electronic control unit 5 delays the time T to send a collision signal to the electronic stability control system ESC controller 13, and the electronic stability control system ESC controller 13 implements active braking after receiving the active braking signal.

[0026] When the simulation device electronic control unit 5 detects that the vehicle deceleration of any front collision sensor 6 reaches the threshold set by the collision intensity, the simulation device electronic control unit 5 delays 0.1s to send a signal to the electronic stability control system ESC controller 13. After receiving the active braking signal, the electronic stability control system ESC controller 13 implements active braking to prevent the vehicle from sliding freely under the action of inertia after the collision, causing the vehicle to collide with each other or other vehicles or objects again, which may cause further damage or loss.

[0027] In some embodiments, the delay time T is set to a value of 0.05s to 0.15s, preferably 0.1s. Setting the delay time within this range can ensure the effective activation of the active braking function while better coordinating with the energy absorption process of the device, thereby maximizing the overall safety and energy absorption effect of the vehicle during a collision.

[0028] In some embodiments, the collision sensor 6 comprises a front collision sensor disposed near a headlamp bracket at the front end of the vehicle.

[0029] In some embodiments, the collision sensor 6 includes a side collision sensor disposed on the inner sides of the left and right fenders at the front end of the vehicle.

[0030] In some embodiments, to more accurately and comprehensively detect vehicle collisions, the collision sensor 6 comprises two types of sensors. The front collision sensor is located near the headlight bracket at the front of the vehicle. This position effectively captures collision signals directly in front of the vehicle, providing accurate information for the system to promptly respond to frontal collisions. The side collision sensors are mounted on the inner sides of the left and right fenders at the front of the vehicle. This arrangement detects collisions occurring on both sides of the vehicle's front, ensuring that signals are quickly transmitted to the simulator's electronic control unit 5 in the event of a side collision. The coordinated operation of the front and side collision sensors allows the collision sensor 6 to cover multiple critical areas at the front of the vehicle, significantly improving the reliability and timeliness of collision detection.

[0031] In some embodiments, the high-speed on-off valve includes a drain valve 8 and an inlet valve 7, both of which are connected to the hydraulic cylinder 2 via an oil pipe 14. Under the control of the electronic control unit, the high-speed on-off valve rapidly opens and closes, thereby controlling the flow of hydraulic oil in and out of the hydraulic cylinder and regulating the hydraulic cylinder pressure. The drain valve 8 is primarily used to drain the hydraulic oil from the hydraulic cylinder 2 when needed, thereby achieving functions such as pressure relief. The inlet valve 7 is used to allow hydraulic oil to enter the hydraulic cylinder 2 during normal braking or when the pressure in the hydraulic cylinder 2 needs to be increased.

[0032] Furthermore, the high-speed on-off valve uses pulse-width modulation technology to control the oil pressure output. When the pulse signal is high, the electromagnet in the high-speed on-off valve is energized. When the pulse signal is low, the electromagnet is de-energized, resulting in zero suction force. By varying the duty cycle, the on-off time of the electromagnet inside the high-speed on-off valve is changed, achieving brake fluid flow control.

[0033] In some embodiments, the inlet valve 7 is connected to a hydraulic pump 9 via an oil pipe 14, which is in turn connected to a motor 10. Driven by the motor 10, the hydraulic pump 9 provides hydraulic oil to the entire hydraulic system, ensuring the system's normal operation and pressure supply. The motor 10 provides power to the hydraulic pump, enabling it to convert mechanical energy into hydraulic energy, meeting the system's requirements for hydraulic oil pressure and flow.

[0034] In some embodiments, the oil pipe 14 is further provided with a relief valve 11 and an accumulator 12, which are disposed between the inlet valve 7 and the hydraulic pump 9. The relief valve 11 automatically opens when the system pressure exceeds a set value, draining excess hydraulic oil back into the tank, thereby protecting other components in the system from damage due to excessive pressure. The accumulator 12 can store a portion of the hydraulic oil when the hydraulic pump 9 is providing sufficient oil, releasing it when the system needs it. This serves to stabilize the system pressure and supplement instantaneous flow demand, thereby stabilizing the pressure in the hydraulic system and improving the system's response speed and stability.

[0035] In some embodiments, the hydraulic cylinder 2 comprises a cylinder body and a piston rod. A damping elastic element 201 is disposed within the cylinder body, and the brake pedal 1 is connected to the piston rod via a connecting fork. One end of the hydraulic cylinder 2 is connected to the brake pedal via a push rod, and the other end is connected to the damping elastic element 201 via a push rod. The hydraulic cylinder 2 is equipped with a piston, and a rubber seal is installed on the outside of the piston to prevent impurities and dust from entering the cylinder body. The damping elastic element 201 is a multi-stage spring, with the spring stiffness selected based on the maximum pedal force, striving for more linear brake pedal force.

[0036] In some embodiments, the middle portion of the brake pedal 1 is hinged to the hydraulic cylinder 2 .

[0037] Specifically, such as Figure 1 As shown, the brake pedal 1 is of a suspended type and is arranged according to the installation space of the smart cockpit. Its upper bracket is installed on the front of the vehicle body, and the lower bracket is installed on the bottom plate of the vehicle body. The brake pedal 1 can be designed flexibly and diversely according to the structural changes of the driving cockpit, and the stepping point meets the ergonomic requirements of the vehicle.

[0038] The brake pedal arm of the brake pedal 1 is located at a point, and the specific point is determined based on the lever ratio of the vehicle's brake pedal 1 and the layout space of the hydraulic cylinder 2. The brake pedal 1 arm is connected to the input push rod of the hydraulic cylinder 2 through a connecting fork and is connected in series with the damping elastic element 201.

[0039] The displacement sensor 3 is installed on the push rod at the input end of the hydraulic cylinder 2 and is connected to the analog device electronic control unit 5 through a hard line. The displacement sensor 3 converts the measured analog signal into a digital signal through an A / D converter and transmits it to the analog device electronic control unit 5 for processing. A pressure sensor 4 is provided in the hydraulic cylinder 2 and is connected to the analog device electronic control unit 5 through a hard line. The pressure sensor 4 converts the measured analog signal into a digital signal through an A / D converter and transmits it to the analog device electronic control unit 5 for processing. At the same time, the pressure sensor 4 is connected to the liquid inlet valve 7 and the liquid discharge valve 8 respectively through the oil pipe 14.

[0040] The other end of the inlet valve 7 is connected to the hydraulic pump 9, which is driven by the motor 10. The inlet valve 7 is connected to the overflow valve 11 through an oil pipe. The other end of the overflow valve 11 is connected to the accumulator 12. The inlet valve 7 and the discharge valve 8 are respectively connected to the simulation device electronic control unit 5 through hard wires, and the simulation device electronic control unit 5 provides power.

[0041] The collision sensor 6 is usually arranged near the front headlamp bracket of the vehicle and on the inner sides of the left and right fenders. The collision sensor 6 is connected to the simulation device electronic control unit 5 through a hard line and is powered by the simulation device electronic control unit 5.

[0042] The simulation device electronic control unit 5 is connected to the electronic stability control system ESC controller 13 via a CAN line.

[0043] The power supply voltage of the simulation device control unit 5 is 12V.

[0044] The present invention is applied to electric commercial vehicles and can adjust the linear feeling of the brake pedal reaction force according to user needs. When the vehicle collides, it is determined that the vehicle deceleration reaches a threshold set by the collision intensity. The simulation device electronic control unit 5 controls the hydraulic cylinder 2 to release pressure, and the brake pedal 1 automatically collapses to absorb the energy of the collision.

[0045] Specifically, the force acting on the damping elastic element 201 is obtained according to the mathematical model of the elastic element. The characteristic equation of the brake pedal travel S is: ; in, is the piston push rod displacement, To damp the force of the elastic element, is the stiffness of the elastic element, i is the lever ratio of the brake pedal, and S is the stroke of the brake pedal.

[0046] Therefore, the relationship between the elastic stiffness of the damping elastic element 201 and the pedal stroke varies linearly.

[0047] The mathematical model of the pressure P of the hydraulic cylinder 2 and the volume V of the brake fluid results in the following relationship: ; Where a and b are fitting coefficients, and V is the volume of brake fluid.

[0048] Calculate the thrust of the piston push rod of hydraulic cylinder 2 , the mathematical model of hydraulic pressure and pedal stroke is obtained: ; in, is the thrust of the piston push rod of hydraulic cylinder 2, A is the piston area of hydraulic cylinder 2, is the elastic modulus of the brake fluid.

[0049] Therefore, the mathematical model of the brake pedal force F and pedal travel S can be obtained:

[0050] The electronic control unit 5 of the simulator provided in this embodiment is designed to use both a PID control algorithm with strong real-time performance and a fuzzy control algorithm that can simulate the driver's braking intention. By combining the PID control algorithm and the fuzzy control algorithm, the driver's demand for brake pedal force can be better simulated.

[0051] The input parameters of the electronic control unit 5 of the simulation device are the brake pedal displacement and the brake pedal displacement change rate, and the control parameter of the electronic control unit 5 of the simulation device is the thrust of the piston push rod output by the hydraulic cylinder 2 .

[0052] The simulation device electronic control unit 5 calculates the driver's brake pedal force expected coefficient f through the fuzzy control algorithm and obtains the target brake pedal force Mathematical model: ; in, is the maximum pedal force of the brake pedal, is the brake pedal force expectation coefficient.

[0053] The simulation device electronic control unit 5 calculates the pedal reaction force value according to the displacement of the brake pedal 1 and the pressure of the hydraulic cylinder 2, and controls the pressure in the hydraulic cylinder 2 by quickly adjusting the liquid inlet valve 7 and the liquid discharge valve 8 to adjust the output force of the piston of the hydraulic cylinder 2. The pressure sensor 4 transmits the actual pressure value in the hydraulic cylinder 2 to the simulation device electronic control unit 5, and the displacement sensor 3 transmits the actual displacement value of the piston of the hydraulic cylinder 2 to the simulation device electronic control unit 5. The simulation device electronic control unit 5 obtains the pedal force F of the brake pedal and the required target brake pedal force value through calculation. By comparison, a closed-loop PID control system with feedback is formed to accurately and in real time control the pressure value of the hydraulic cylinder 2.

[0054] When a vehicle collides, the collision sensor located at the front of the vehicle sends a signal to the simulator's electronic control unit (ECU) 5. After complex calculations, if the ECU 5 determines that the actual collision pressure is greater than or equal to the collision pressure threshold, it controls the drain valve 8 to fully open, depressurizing the hydraulic cylinder 2 and allowing the brake fluid to flow back into the brake reservoir. The reaction force from the driver's brake pedal pressure disappears, and the brake pedal 1 automatically collapses, absorbing the collision energy and preventing further damage to the driver's right foot. Simultaneously, the ECU 5 delays 0.1 seconds to transmit the collision signal to the electronic stability control (ESC) controller 13. Upon receiving the active braking signal, the ESC controller 13 applies active braking, for example, controlling the wheel brake system to apply appropriate braking force to quickly decelerate and stabilize the vehicle. This prevents the vehicle from sliding freely due to inertia after the collision, potentially leading to another collision with another vehicle or object, which could cause further injury or damage.

[0055] The simulation device electronic control unit 5 sends the collision signal to the electronic stability control system ESC controller 13 with a delay of 0.1s, which can ensure the effective activation of the active braking function while better coordinating with the energy absorption process of the device, thereby maximizing the overall safety and energy absorption effect of the vehicle during a collision.

[0056] The workflow of this application: Normal braking process: When the driver steps on the brake pedal 1, the brake pedal 1 pushes the piston rod of the hydraulic cylinder 2 through the connecting fork to move, and the piston moves in the cylinder body, so that the hydraulic oil in the cylinder body is squeezed.

[0057] The displacement sensor 3 monitors the displacement of the piston in real time and transmits the displacement signal to the simulation device electronic control unit 5. At the same time, the pressure sensor 4 detects the pressure change in the hydraulic cylinder and also sends the pressure signal to the simulation device electronic control unit 5.

[0058] Based on the received displacement and pressure signals, the simulator's electronic control unit 5 calculates the brake pedal reaction force according to a preset algorithm. It then rapidly adjusts the high-speed on-off valves (inlet valve 7 and outlet valve 8) to control the pressure within hydraulic cylinder 2, thereby adjusting the piston output force of hydraulic cylinder 2 to ensure the driver experiences a pedal reaction force consistent with the actual braking situation. For example, to increase the brake pedal reaction force, the simulator's electronic control unit 5 controls the inlet valve 7 to open, allowing hydraulic oil from the hydraulic pump 9 to enter hydraulic cylinder 2, increasing the pressure within the cylinder and thereby increasing the piston output force and, consequently, the pedal reaction force. Conversely, to decrease the pedal reaction force, the simulator's electronic control unit 5 controls the outlet valve 8 to open, draining the hydraulic oil from hydraulic cylinder 2. This reduces the pressure, piston output force, and, consequently, the pedal reaction force.

[0059] During this process, relief valve 11 provides protection. If the system pressure exceeds the set value for some reason, it automatically opens to drain excess hydraulic oil back to the tank, preventing damage to components caused by excessive system pressure. The accumulator 12 stores hydraulic oil when the hydraulic pump is providing sufficient oil. When the system instantly requires a higher flow of hydraulic oil (such as when the driver quickly depresses the brake pedal), the accumulator quickly releases the stored hydraulic oil to replenish the system flow. This makes the hydraulic system's pressure response faster and smoother, improving braking comfort and stability.

[0060] Working process during collision: When the vehicle collides, the collision sensor 6 (front collision sensor or side collision sensor) senses the intensity and direction of the collision and immediately sends a collision signal to the simulation device electronic control unit 5.

[0061] After receiving the collision signal, the simulator's electronic control unit 5 rapidly calculates and determines whether the vehicle's deceleration has reached the threshold set for the collision intensity. If so, the simulator's electronic control unit 5 immediately controls hydraulic cylinder 2 to relieve pressure. Specifically, it opens drain valve 8, rapidly draining the hydraulic fluid from cylinder 2. This rapidly reduces the pressure within cylinder 2, causing brake pedal 1 to automatically collapse, absorbing the collision energy and preventing serious injury to the driver's right foot from the rigid impact of brake pedal 1.

[0062] At the same time, the simulator's electronic control unit 5 sends a collision signal to the electronic stability control (ESC) controller 13 with a delay of 0.1 seconds. Upon receiving the active braking signal, the ESC controller 13 implements active braking, for example, controlling the wheel braking system to apply appropriate braking force to quickly decelerate and stabilize the vehicle. This prevents the vehicle from sliding freely due to inertia after the collision, potentially leading to another collision with another vehicle or object, which could cause further injury or damage.

[0063] In summary, the beneficial effects of the present invention are: ① The present invention is based on the combined simulation of brake pedal force by hydraulic elements and elastic elements, which can well simulate the pedal force of the brake pedal and conform to the braking characteristics of the pedal.

[0064] ② During actual use of the present invention, the brake pedal force is moderate and the linearity is strong.

[0065] ③ In the present invention, when a vehicle collides, the electronic control unit 5 of the simulation device controls the hydraulic cylinder 2 to release pressure, and the brake pedal 1 automatically collapses to absorb the energy of the collision, thereby preventing the driver's right foot from being seriously injured.

[0066] ④ When the brake pedal 1 is triggered to automatically collapse, the electronic control unit 5 of the simulation device delays 0.1s to send a signal to the electronic stability control system ESC controller 13. After receiving the active braking signal, the electronic stability control system ESC controller 13 implements active braking to avoid the vehicle sliding under the action of inertia after a collision, causing the vehicles to collide with each other or other objects again, which may cause further damage or loss.

[0067] The present application also provides an energy-absorbing brake pedal simulation system, including an energy-absorbing brake pedal simulation device.

[0068] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 a limitation on this application. 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0069] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0070] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An energy-absorbing brake pedal simulation device, characterized in that: It includes: A brake pedal (1), a hydraulic cylinder (2), a high-speed switch valve, and a hydraulic pump (9) are connected in sequence, wherein the input end of the hydraulic cylinder (2) is provided with a displacement sensor (3), and the output end of the hydraulic cylinder (2) is provided with a pressure sensor (4); a simulation device electronic control unit (5), wherein the simulation device electronic control unit (5) is respectively connected to the displacement sensor (3), the pressure sensor (4) and the high-speed switching valve, and is also connected to a collision sensor (6); The brake pedal (1) is stepped on to push the piston of the hydraulic cylinder (2) to move, the displacement sensor (3) outputs a displacement signal to the simulation device electronic control unit (5), and the pressure sensor (4) outputs a pressure signal in the hydraulic cylinder (2) to the simulation device electronic control unit (5); During a collision, the collision sensor (6) sends a collision signal to the simulation device electronic control unit (5), and the simulation device electronic control unit (5) controls the opening of the high-speed switching valve to relieve pressure on the hydraulic cylinder (2).

2. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The simulation device electronic control unit (5) is connected to an electronic stability control system ESC controller (13) via a CAN line; When a collision occurs, the simulator electronic control unit (5) sends a collision signal to an electronic stability control system (ESC) controller (13) after a delay of time T, and the electronic stability control system (ESC) controller (13) implements active braking after receiving the active braking signal.

3. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The delay time T is set to a value of 0.05s to 0.15s.

4. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The collision sensor (6) comprises a front collision sensor arranged near a headlamp bracket at the front end of the vehicle.

5. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The collision sensor (6) comprises a side collision sensor arranged on the inner sides of the left and right fenders at the front end of the vehicle.

6. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The high-speed switching valve comprises a liquid discharge valve (8) and a liquid inlet valve (7), and both the liquid discharge valve (8) and the liquid inlet valve (7) are connected to the hydraulic cylinder (2) via an oil pipe (14).

7. The energy-absorbing brake pedal simulation device according to claim 6, characterized in that: The liquid inlet valve (7) is connected to the hydraulic pump (9) via an oil pipe (14), and the hydraulic pump (9) is connected to a motor (10).

8. The energy-absorbing brake pedal simulation device according to claim 7, wherein: The oil pipe (14) is further provided with an overflow valve (11) and an accumulator (12), and the overflow valve (11) and the accumulator (12) are arranged between the liquid inlet valve (7) and the hydraulic pump (9).

9. The energy-absorbing brake pedal simulation device according to claim 1, wherein: The hydraulic oil cylinder (2) comprises a cylinder body and a piston rod, a damping elastic element (201) is provided in the cylinder body, and the brake pedal (1) is connected to the piston rod via a connecting fork.

10. An energy-absorbing brake pedal simulation system, characterized in that: It comprises the energy-absorbing brake pedal simulation device as described in any one of claims 1 to 9.

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