Vehicle pedal simulation device and control method

Abstract

This disclosure provides a vehicle pedal simulation device and control method, relating to the field of vehicle technology. The vehicle pedal simulation device includes: a simulation component comprising a simulation cylinder and a simulation piston located within the simulation cylinder, the simulation piston dividing the interior of the simulation cylinder into a first simulation chamber and a second simulation chamber; a pressure control component connected to the first simulation chamber via multiple oil circuits, capable of controlling the oil pressure input to the first simulation chamber through each of the oil circuits; the pressure control component can switch between multiple operating modes, with different oil circuits activated and different oil pressures in different operating modes; and a brake pedal connected to the pressure control component, used to control the pressure control component to input brake fluid to the first simulation chamber through the oil circuits. This improves the comfort of the pedal feel.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more specifically, to a vehicle pedal simulation device and control method. Background Technology

[0002] In hydraulic braking systems, when the driver presses the brake pedal, there is force feedback on the pedal to provide the driver with a suitable pedal feel. At the same time, the vehicle's braking control module applies hydraulic pressure to the wheel-end brakes to generate braking force to brake the vehicle. However, the pedal feel comfort of existing braking systems needs improvement.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This disclosure provides a vehicle pedal simulation device and control method to improve the comfort of pedal feel.

[0005] According to a first aspect of this disclosure, a vehicle pedal simulation device is provided, comprising:

[0006] The simulation assembly includes a simulation cylinder and a simulation piston located within the simulation cylinder, the simulation piston dividing the interior of the simulation cylinder into a first simulation chamber and a second simulation chamber;

[0007] The pressure control component is connected to the first simulation chamber through multiple oil circuits and can control the oil pressure input to the first simulation chamber through each of the oil circuits; the pressure control component can switch between multiple operating modes, and the oil circuits opened by the pressure control component are different in different operating modes, and the oil pressure of the different oil circuits is different;

[0008] The brake pedal is connected to the pressure control component and is used to control the pressure control component to input brake fluid into the first simulation chamber through the oil circuit.

[0009] In one embodiment of this disclosure, the pressure control component includes:

[0010] A brake cylinder includes a brake cylinder body and a first brake piston located within the brake cylinder body; the first brake piston divides the brake cylinder body into a brake air chamber and a brake oil chamber along the axial direction of the brake cylinder body; the first brake piston is connected to the brake pedal via a piston rod extending out of the brake air chamber; the brake oil chamber is connected to the first simulated chamber via multiple oil passages;

[0011] Control unit;

[0012] A control valve is connected to a plurality of the oil circuits and is used, under the control of the control unit, to open one of the oil circuits in any one of the operating modes; the oil circuit opened by the control valve is different in different operating modes.

[0013] In one embodiment of this disclosure, the brake cylinder further includes a second brake piston, which is located within the brake fluid chamber and divides the brake fluid chamber into multiple sub-chambers, one of which is connected to the control valve; the operating mode includes a first operating mode and a second operating mode, and the oil circuit includes a first oil circuit and a second oil circuit;

[0014] The portion of the first oil circuit connecting the control valve and the first simulation chamber is provided with a first throttling device, and the portion of the second oil circuit connecting the control valve and the first simulation chamber is provided with a second throttling device. In the first operating mode, the control valve opens the first oil circuit; in the second operating mode, the control valve opens the second oil circuit.

[0015] In one embodiment of this disclosure, the first throttling element has a first channel through which the brake fluid flows, and the second throttling element has a second channel through which the brake fluid flows, wherein the inner diameter of the first channel is larger than the inner diameter of the second channel.

[0016] In one embodiment of this disclosure, the sub-oil chamber includes a first sub-oil chamber and a second sub-oil chamber; the first sub-oil chamber is provided with a first elastic element, which is used to apply a force to the second brake piston to move towards the bottom of the brake cylinder; the second sub-oil chamber is provided with a second elastic element, which is used to apply a force to the second brake piston to prevent it from moving towards the bottom of the brake cylinder.

[0017] In one embodiment of this disclosure, the brake cylinder further includes a second brake piston located within the brake fluid chamber, dividing the brake fluid chamber into a first sub-chamber and a second sub-chamber. The first sub-chamber is provided with a first elastic element, which applies a force to the second brake piston to move it toward the bottom of the brake cylinder. The second sub-chamber is provided with a second elastic element, which applies a force to the second brake piston to impede its movement toward the bottom of the brake cylinder. The initial force of the first elastic element is less than the initial force of the second elastic element.

[0018] The working mode includes a first working mode and a second working mode, and the oil circuit includes a first oil circuit and a second oil circuit; the part of the first oil circuit that connects the first sub-oil chamber and the control valve is independent of the part of the second oil circuit that connects the second sub-oil chamber and the control valve.

[0019] In the first operating mode, the control valve connects the first oil circuit; in the second operating mode, the control valve connects the second oil circuit.

[0020] In one embodiment of this disclosure, the vehicle pedal simulation device further includes a temperature sensing component, which is used to detect the ambient temperature and send the temperature detection value to the brake control module.

[0021] The control unit is used to switch the operating mode in response to the mode switching command issued by the braking control module.

[0022] In one embodiment of this disclosure, the vehicle pedal simulation device further includes a brake fluid tank; the brake fluid tank includes a first fluid chamber and a second fluid chamber that are connected, the first fluid chamber being connected to a first sub-fluid chamber, and the second fluid chamber being connected to the second sub-fluid chamber.

[0023] In one embodiment of this disclosure, the simulation assembly further includes a third elastic element located in the second simulation cavity, the third elastic element being used to apply a force to the simulated piston to impede its movement toward the bottom of the simulated cylinder.

[0024] In one embodiment of this disclosure, the brake cylinder is provided with a stroke sensor, which is configured to detect the stroke of the piston rod and send stroke information to the control unit.

[0025] According to a second aspect of this disclosure, a control method for a vehicle pedal simulation device is provided, applied to the aforementioned vehicle pedal simulation device, the control method comprising:

[0026] Detect ambient temperature;

[0027] When the temperature detection value is lower than the preset temperature value, and the pressure control component is in the second working mode, the pressure control component is switched to the first working mode; the oil pressure in the first working mode is lower than the oil pressure in the second working mode.

[0028] According to a third aspect of this disclosure, a control method for a vehicle pedal simulation device is provided, applied to the aforementioned vehicle pedal simulation device, the control method comprising:

[0029] In response to driving mode information, a mode switching command is sent to the control unit; the driving modes include a first driving mode and a second driving mode;

[0030] In response to the mode switching command, the pressure control component is switched to the corresponding operating mode, and the first operating mode corresponds to the first driving mode, and the second operating mode corresponds to the second driving mode.

[0031] The vehicle pedal simulation device and control method disclosed herein set multiple working modes through a pressure control component. Different oil pressures are connected in different working modes to provide the driver with different pedal feel, which helps to improve the comfort of the pedal feel.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0034] Figure 1 This is a schematic diagram of a vehicle braking system according to one embodiment of the present disclosure.

[0035] Figure 2 This is a schematic diagram of a vehicle pedal simulation device using a first oil circuit in one embodiment of the present disclosure.

[0036] Figure 3 This is a schematic diagram of a vehicle pedal simulation device employing a second oil circuit in one embodiment of the present disclosure.

[0037] Figure 4 This invention provides a graph showing the relationship between pedal force and pedal travel when the brake pedal is depressed at different speeds and when the first oil circuit and the second oil circuit are used, respectively, in one embodiment of the present disclosure.

[0038] Figure 5 This is a schematic diagram of a vehicle pedal simulation device using a first oil circuit in one embodiment of the present disclosure.

[0039] Figure 6 This is a schematic diagram of a vehicle pedal simulation device employing a second oil circuit in one embodiment of the present disclosure.

[0040] Figure 7 This is a schematic diagram illustrating the relationship between the brake pedal travel and pedal force of each of the simulation components, the first elastic element, and the second elastic element in one embodiment of this disclosure.

[0041] Figure 8 This is a schematic diagram showing the relationship between brake pedal travel and pedal force when a first oil circuit and a second oil circuit are used in one embodiment of this disclosure.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Driving mode management module; 2. Braking control module; 3. Vehicle pedal simulation device; 31. Simulation component; 311. Simulation cylinder; 312. Simulation piston; 313. First simulation chamber; 314. Second simulation chamber; 315. Third elastic element; 32. Pressure control component; 321. Brake cylinder; 3211. Brake cylinder body; 3212a. First brake piston; 3212b. Second brake piston; 3213. First sub-oil chamber; 3214. Second sub-oil chamber; 3215. Brake air chamber; 3216. First elastic element; 3217. Second elastic element; 322. Control valve; 323. Control unit; 324. First throttle element; 325. Second throttle element; 33. Brake pedal; 34. Brake oil tank; 341. First oil chamber; 342. Second oil chamber; 35. Stroke sensor; 36. Pressure sensor; 4. Wheel speed sensing module; 5. Display panel; 6. Temperature sensing component. Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0045] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0046] This disclosure provides a vehicle braking system, see [link to relevant documentation]. Figure 1 It includes a driving mode management module 1, a braking control module 2, and a vehicle pedal simulation device 3.

[0047] The driving mode management module 1 is used to send driving mode information to the braking control module 2. The driving mode information is the driving mode of the vehicle. The driving mode includes a first driving mode and a second driving mode. Of course, the driving mode can also include more than two driving modes. For example, the driving mode can be an economy mode, a standard mode, a sport mode, etc.

[0048] The braking control module 2 is used to send a mode switching command to the vehicle pedal simulation device 3 in response to the received driving mode information, and is used to switch the pressure build-up to decelerate the wheels.

[0049] The vehicle pedal simulation device 3 is used to switch its operating mode in response to a mode switching command, thereby providing the driver with different pedal sensations. The operating modes of the vehicle pedal simulation device 3 include multiple modes during operation. The oil pressure of the vehicle pedal simulation device 3 varies in different operating modes, thus providing the driver with different pedal sensations. For example, the operating modes may include a first operating mode and a second operating mode. Figure 2 , Figure 3 In this implementation, the oil pressure in the first operating mode is lower than that in the second operating mode, so that the vehicle pedal simulation device 3 provides the driver with a more comfortable pedal feel in the first operating mode. As another example, the operating modes may include two or more modes to provide the driver with a variety of pedal feels to suit different drivers and different driving modes.

[0050] In this way, the vehicle pedal simulation device 3 can be switched to the working mode corresponding to the driving mode, so as to provide the driver with different pedal feel, improve the comfort of the pedal feel, and make it suitable for different drivers.

[0051] In one embodiment of this disclosure, each operating mode has a one-to-one corresponding pressure build-up. For example, the first operating mode corresponds to the first pressure build-up, and the second operating mode corresponds to the second pressure build-up.

[0052] In one embodiment of this disclosure, each driving mode has a corresponding operating mode. When the vehicle is in one of the driving modes, the brake control module 2 controls the vehicle pedal simulation device 3 to operate in the corresponding mode, so as to facilitate intelligent switching of pedal feel. In other embodiments of this disclosure, the operating mode can be manually switched according to the driver's needs (for example, the operating mode can be manually switched on the display panel according to the driver's needs) to suit different drivers' driving styles.

[0053] In one embodiment of this disclosure, see Figure 1 The vehicle pedal simulation device 3 is also used to send first feedback information and second feedback information to the brake control module 2. The first feedback information is used to determine whether the working mode can be switched before the switch; the second feedback information is used to determine the working mode of the vehicle pedal simulation device 3 after the switch.

[0054] Braking control module 2 is also used to respond to the received first feedback information and second feedback information, and send working mode matching information to driving mode management module 1, wherein the working mode matching information is the working mode of vehicle pedal simulation device 3.

[0055] The driving mode management module 1 is used to match the vehicle's driving mode with the working mode of the vehicle pedal simulation device 3 in response to the working mode matching information, so that the driving mode and the working mode correspond one-to-one.

[0056] The vehicle pedal simulation device 3 sends first and second feedback information to the brake control module 2, and the brake control module 2 sends working mode matching information to the driving mode management module 1 to monitor whether the working mode has been successfully switched, thereby improving the reliability of the vehicle braking system.

[0057] In one embodiment of this disclosure, see Figure 1 The vehicle braking system also includes a wheel speed sensing module 4, which detects the wheel speeds of the vehicle and sends the detected wheel speed values ​​to the braking control module 2. Wheel speeds can be categorized into low-speed and high-speed gears. The low-speed gear corresponds to the second operating mode, with higher oil pressure and greater pedal force, providing the driver with a controllable pedal feel when the vehicle is traveling at low speeds. The high-speed gear corresponds to the first operating mode, with lower oil pressure and less pedal force, improving the driver's foot strength utilization and enhancing driving safety when the vehicle is traveling at high speeds. For example, the speed range of the low-speed gear can be 0 km / h to 60 km / h; for example, the speeds of the low-speed gear can be 0 km / h, 20 km / h, 40 km / h, 60 km / h, etc. The speed of the high-speed gear can be greater than 60 km / h; for example, the speeds of the high-speed gear can be 70 km / h, 82 km / h, 120 km / h, 144 km / h, etc.

[0058] The braking control module 2 is also used to receive the wheel speed detection value sent by the wheel speed sensing module 4 and match the wheel speed detection value with the speed gear (low speed gear and high speed gear). When the speed gear does not match the working mode, it can send a mode switching command to the vehicle pedal simulation device 3 so that the working mode matches the speed gear.

[0059] For example, the speed range for low gear can be 0 km / h to 60 km / h, and the speed for high gear can be greater than 60 km / h. When the wheel speed detection value is 22 km / h and the vehicle pedal simulation device 3 is in the second operating mode, the brake control module 2 does not activate because this speed is in low gear. As another example, when the wheel speed detection value is 88 km / h and the vehicle pedal simulation device 3 is in the second operating mode, the brake control module 2 sends a mode switching command to the vehicle pedal simulation device 3 to switch it to the first operating mode because this speed is in high gear. As yet another example, when the wheel speed detection value is 120 km / h and the vehicle pedal simulation device 3 is in the first operating mode, the brake control module 2 does not activate because this speed is in high gear.

[0060] In one embodiment of this disclosure, see Figure 1 The braking control module 2 is also used to send mode switching prompts. The vehicle braking system also includes a display panel 5. The display panel 5 is used to receive the mode switching prompts sent by the braking control module 2 and display the screen. The display panel 5 can be a touch-sensitive display panel for easy human-machine interaction.

[0061] In one embodiment of this disclosure, see Figure 2 The vehicle pedal simulation device 3 includes a simulation component 31, a pressure control component 32, and a brake pedal 33. The simulation component 31 includes a simulation cylinder 311 and a simulation piston 312 located within the simulation cylinder 311. The simulation piston 312 divides the interior of the simulation cylinder 311 into a first simulation chamber 313 and a second simulation chamber 314. The first simulation chamber 313 is connected to the pressure control component 32 via multiple oil circuits and can control the oil pressure input to the first simulation chamber 313 through each oil circuit. The pressure control component 32 can switch between multiple operating modes, and in any operating mode, it can activate one of the oil circuits. The oil circuit activated by the pressure control component 32 differs in different operating modes, and the oil pressure of each oil circuit is different. The oil pressure of the oil circuit is the oil pressure of the brake fluid input to the first simulation chamber 313 through the oil circuit. The brake pedal 33 is connected to the pressure control component 32 and is used to control the pressure control component 32 to input brake fluid to the first simulation chamber 313 through the oil circuit.

[0062] In this way, by activating the corresponding oil circuit through the pressure control component 32 in one working mode, when the driver presses the brake pedal 33, different pedal feel can be provided to the driver through the oil circuit with different oil pressure, thereby improving the comfort of the pedal feel, making it suitable for different drivers, and helping to improve the driving safety of the vehicle.

[0063] In one embodiment of this disclosure, see Figure 2 and Figure 3The pressure control assembly 32 includes a brake cylinder 321, a control valve 322, and a control unit 323. The brake cylinder 321 includes a brake cylinder body 3211 and a first brake piston 3212a located within the brake cylinder body 3211. The first brake piston 3212a divides the interior of the brake cylinder body 3211 into a brake air chamber 3215 and a brake oil chamber along the axial direction of the brake cylinder body 3211. The first brake piston 3212a is connected to the brake pedal 33 via a piston rod extending out of the brake air chamber 3215. The brake oil chamber is connected to the first simulation chamber 313 via multiple oil passages.

[0064] The control unit 323 is used to control the control valve 322 to open the corresponding oil circuit in different working modes in response to the mode switching command; the control unit 323 is also used to send the first feedback information and the second feedback information to the brake control module 2.

[0065] The control valve 322 is connected to multiple oil circuits and is used to open one of the oil circuits in any one of the operating modes under the control of the control unit 323; the oil circuit opened by the control valve 322 is different in different operating modes.

[0066] Thus, when the control unit 323 receives a mode switching command, it controls the control valve 322 to switch so that the oil circuit corresponding to the working mode is opened, thereby providing the driver with different pedal feel.

[0067] In one embodiment of this disclosure, see Figure 2 and Figure 3 The control valve 322 can be a two-position three-way solenoid valve. Using a two-position three-way solenoid valve simplifies the structure and reduces costs.

[0068] In one embodiment of this disclosure, see Figure 2 and Figure 3 The brake cylinder 321 further includes a second brake piston 3212b, which is located within the brake oil chamber and divides the brake oil chamber into multiple sub-chambers, one of which is connected to the control valve 322. The operating modes include a first operating mode and a second operating mode, and the oil circuit includes a first oil circuit and a second oil circuit. The portion of the first oil circuit connecting the control valve 322 and the first simulation chamber 313 is provided with a first throttling element 324, and the portion of the second oil circuit connecting the control valve 322 and the first simulation chamber 313 is provided with a second throttling element 325. In the first operating mode, the control valve 322 opens the first oil circuit; in the second operating mode, the control valve 322 opens the second oil circuit.

[0069] Thus, in the first operating mode, the control unit 323 controls the control valve 322 to open the first oil circuit, so that the brake fluid flows from the brake fluid chamber through the control valve 322 and the first throttling element 324 in sequence, and finally flows into the first simulation chamber 313; in the second operating mode, the control unit 323 controls the control valve 322 to open the second oil circuit, so that the brake fluid flows from the brake fluid chamber through the control valve 322 and the second throttling element 325 in sequence, and finally flows into the first simulation chamber 313, which facilitates providing the driver with different pedal feel and is suitable for different drivers' driving needs.

[0070] In one embodiment of this disclosure, see Figure 2 and Figure 3 The first throttling element 324 has a first channel through which the brake fluid flows, and the second throttling element 325 has a second channel through which the brake fluid flows. The inner diameter of the first channel is larger than the inner diameter of the second channel, so that the flow rate of the first throttling element 324 is greater than the flow rate of the second throttling element 325, thereby achieving that the oil pressure of the first oil circuit is less than the oil pressure of the second oil circuit, so that the pedal force in the first working mode is less than the pedal force in the second working mode.

[0071] In one embodiment of this disclosure, see Figure 2 and Figure 3 The sub-oil chamber includes a first sub-oil chamber 3213 and a second sub-oil chamber 3214. The first sub-oil chamber 3213 is provided with a first elastic element 3216, which applies a force to the second brake piston 3212b to move towards the bottom of the brake cylinder 3211. The second sub-oil chamber 3214 is provided with a second elastic element 3217, which applies a force to the second brake piston 3212b to resist its movement towards the bottom of the brake cylinder 3211. The first elastic element 3216 and the second elastic element 3217 can be springs, which are in a compressed state. In the first sub-oil chamber 3213, one end of the spring can abut against the first brake piston 3212a, and the other end can abut against the second brake piston 3212b; in the second sub-oil chamber 3214, one end of the spring can abut against the second brake piston 3212b, and the other end can abut against the bottom of the brake cylinder 3211, so that the piston rod is pushed back when the driver does not press the brake pedal 33.

[0072] In one embodiment of this disclosure, see Figure 2 and Figure 3The first oil circuit has a first sub-oil circuit and a second sub-oil circuit; the second oil circuit has a third sub-oil circuit and a fourth sub-oil circuit. Specifically, the first sub-oil chamber 3213 is connected to the control valve 322 via the first sub-oil circuit, and the control valve 322 is connected to the first simulation chamber 313 via the second sub-oil circuit. A first throttling element 324 is located on the second sub-oil circuit. The first sub-oil chamber 3213 is connected to the control valve 322 via the third sub-oil circuit, and the control valve 322 is connected to the first simulation chamber 313 via the fourth sub-oil circuit. A second throttling element 325 is located on the fourth sub-oil circuit. The first and third sub-oil circuits can be the same sub-oil circuit.

[0073] In one embodiment of this disclosure, when the ambient temperature is low (e.g., less than 0°C in winter), the brake fluid viscosity is high, and brake fluid can be supplied to the first simulation chamber 313 through the first oil circuit. Since the oil pressure in the first oil circuit is lower than that in the second oil circuit, the throttling effect of the first oil circuit is smaller, resulting in a smaller pedal force in the first operating mode than in the second operating mode, so that the driver can more easily press the brake pedal 33.

[0074] Figure 4 The diagram illustrates the relationship between brake pedal travel and pedal force in one embodiment of this disclosure, where the brake pedal 33 is depressed at slow, medium, and fast speeds, and the system includes a first throttling element 324 and a second throttling element 325. (See also...) Figure 4 When the brake pedal 33 is pressed slowly at the same pedal speed, the relationship curves between pedal force and brake pedal travel are basically the same for both the first and second hydraulic circuits, indicating that the pedal feel in the first and second operating modes is essentially the same. When the brake pedal 33 is pressed at a medium speed with the same pedal force, the brake pedal travel using the first hydraulic circuit is greater than that using the second hydraulic circuit, reflecting lower pedal damping in the first operating mode. When the brake pedal 33 is pressed quickly with the same pedal force, the brake pedal travel using the first hydraulic circuit is greater than that using the second hydraulic circuit, reflecting lower pedal damping in the first operating mode. When using the first hydraulic circuit, with the same pedal force, the brake pedal travel increases sequentially from quick pressing to medium pressing to slow pressing. When using the second oil circuit, when the brake pedal 33 is pressed with the same pedal force, the travel of the brake pedal 33 increases sequentially for fast pressing, medium pressing, and slow pressing.

[0075] In one embodiment of this disclosure, the vehicle pedal simulation device 3 further includes a temperature sensing component 6, which detects the ambient temperature and sends a temperature detection value. The brake control module 2 is also used to receive the temperature detection value sent by the temperature sensing component 6 and compare the temperature detection value with a preset temperature value. When the temperature detection value is less than the preset temperature value and the control unit 323 is in a second operating mode, the brake control module 2 sends a mode switching command to the control unit 323. For example, if the preset temperature value is 0℃, and the temperature detection value is -1℃ while the control unit 323 is in the second operating mode, the brake control module 2 sends a mode switching command to the control unit 323. The control unit 323 then switches to the first operating mode by controlling the control valve 322 to open the first oil circuit, providing the driver with a pedal feel with less damping. As another example, if the preset temperature value is 0℃, and the temperature detection value is -1℃ while the control unit 323 is in the first operating mode, the brake control module 2 does not send a mode switching command to the control unit 323, thus the control unit 323 does not switch operating modes. For another example, if the preset temperature value is 0℃, and the temperature detection value is 0℃ and the control unit 323 is in the second working mode, the brake control module 2 will not send a mode switching command to the control unit 323, so the control unit 323 will not switch the working mode.

[0076] In this way, the operating mode can be automatically switched through the temperature sensing component 6, which improves the automation level of the vehicle pedal simulation device 3.

[0077] In one embodiment of this disclosure, see Figure 1 The temperature sensing component 6 can be located on the whole vehicle, rather than on the vehicle pedal simulation device 3, so that the temperature sensing component 6 and the vehicle pedal simulation device 3 are side by side.

[0078] In one embodiment of this disclosure, see Figure 5 and Figure 6The brake cylinder 321 further includes a second brake piston 3212b, which is located within the brake oil chamber and divides the brake oil chamber into a first sub-chamber 3213 and a second sub-chamber 3214. The first sub-chamber 3213 is provided with a first elastic element 3216, which applies a force to the second brake piston 3212b to move towards the bottom of the brake cylinder body 3211. The second sub-chamber 3214 is provided with a second elastic element 3217, which applies a force to the second brake piston 3212b to resist its movement towards the bottom of the brake cylinder body 3211. The initial force of the first elastic element 3216 is less than the initial force of the second elastic element 3217. Therefore, the pedal force in the first working mode is less than the pedal force in the second working mode (at this time, if the oil pressure of the first oil circuit is greater than the oil pressure of the second oil circuit under the same pedal force). The operating modes include a first operating mode and a second operating mode, and the oil circuit includes a first oil circuit and a second oil circuit; the portion of the first oil circuit connecting the first sub-oil chamber 3213 and the control valve 322 is independent of the portion of the second oil circuit connecting the second sub-oil chamber 3214 and the control valve 322; in the first operating mode, the control valve 322 opens the first oil circuit; in the second operating mode, the control valve 322 opens the second oil circuit.

[0079] Thus, since the first sub-oil chamber 3213 and the second sub-oil chamber 3214 are respectively provided with a first elastic element 3216 and a second elastic element 3217, and the first elastic element 3216 and the second elastic element 3217 can be springs with different forces; the oil pressure when oil is supplied to the first simulation chamber 313 through the first sub-oil chamber 3213 and the control valve 322 in sequence is different from the oil pressure when oil is supplied to the first simulation chamber 313 through the second sub-oil chamber 3214 and the control valve 322 in sequence, that is, the oil pressure of the first oil circuit and the second oil circuit are different, so as to provide different pedal forces for the driver.

[0080] In one embodiment of this disclosure, see Figure 5 and Figure 6 The first oil circuit has a first sub-oil circuit and a second sub-oil circuit; the second oil circuit has a third sub-oil circuit and a fourth sub-oil circuit. Specifically, the first sub-oil chamber 3213 is connected to the control valve 322 via the first sub-oil circuit, and the control valve 322 is connected to the first simulation chamber 313 via the second sub-oil circuit. The second sub-oil chamber 3214 is connected to the control valve 322 via the third sub-oil circuit, and the control valve 322 is connected to the first simulation chamber 313 via the fourth sub-oil circuit. The second and fourth sub-oil circuits can be the same sub-oil circuit.

[0081] In one embodiment of this disclosure, see Figure 2 , Figure 3 , Figure 5 and Figure 6 The simulation component 31 also includes a third elastic element 315 located in the second simulation cavity 314. The third elastic element 315 is used to apply a force to the simulation piston 312 to prevent it from moving towards the bottom of the simulation cylinder 311. The third elastic element 315 can be a spring or a rubber assembly or other elastic structure. One end of the third elastic element 315 abuts against the inner wall of the simulation cylinder 311, and the other end abuts against the simulation piston 312, so that when the driver releases the brake pedal 33, it pushes the simulation piston 312 to move along the axial direction of the brake cylinder, so that the simulation piston 312 returns to its original position.

[0082] In one embodiment of this disclosure, see Figure 2 , Figure 3 , Figure 5 and Figure 6 The vehicle pedal simulation device 3 also includes a brake fluid tank 34; the brake fluid tank 34 includes a first oil chamber 341 and a second oil chamber 342 connected together, the first oil chamber 341 is connected to a first sub-oil chamber 2313, and the second oil chamber 342 is connected to a second sub-oil chamber 3214, so as to provide brake fluid to the two sub-oil chambers through the first oil chamber 341 and the second oil chamber 342.

[0083] In one embodiment of this disclosure, see Figure 2 , Figure 3 , Figure 5 and Figure 6 The second simulation chamber 314 is connected to the second oil chamber 342 so that the brake fluid entering the simulation cylinder 311 can flow back to the brake oil tank 34.

[0084] Figure 7 The diagram shown illustrates the relationship between the brake pedal travel and pedal force of the first elastic element 3216, the second elastic element 3217, and the simulation component 31 in one embodiment of this disclosure.

[0085] Figure 8 The diagram shown illustrates the relationship between brake pedal travel and pedal force when a first oil circuit and a second oil circuit are used in one embodiment of this disclosure. (See also...) Figure 7 The initial force of the first elastic element 3216 located in the first sub-oil cavity 3213 is less than the initial force of the second elastic element 3217 located in the second sub-oil cavity 3214. The force generated in the first simulated cavity 313 is greater than the initial force of the second elastic element 3217 located in the second sub-oil cavity 3214. The first elastic element 3216 and the second elastic element 3217 have the same stiffness. See also... Figure 8When the brake pedal 33 is pressed with the same pedal force, the travel of the brake pedal 33 when oil is supplied to the first simulation chamber 313 through the first oil circuit is greater than the travel of the brake pedal 33 when oil is supplied to the first simulation chamber 313 through the second oil circuit, so as to reflect that the pedal force in the first working mode is less than the pedal force in the second working mode.

[0086] In one embodiment of this disclosure, see Figure 2 , Figure 3 , Figure 5 and Figure 6 The brake cylinder 321 is equipped with a stroke sensor 35, which is configured to detect the stroke of the piston rod and send stroke information to the control unit 323. The control unit 323 is used to generate and send a braking signal to control the vehicle braking system based on the stroke information. The brake control module 2 builds up pressure based on the braking signal.

[0087] In one embodiment of this disclosure, see Figure 2 , Figure 3 The brake cylinder 321 is also equipped with a pressure sensor 36 to detect the oil pressure inside the brake cylinder 321.

[0088] This disclosure also provides a control method for a vehicle braking system, applied to the aforementioned vehicle braking system, the control method comprising:

[0089] Step S100: Driving mode management module 1 sends driving mode information to braking control module 2;

[0090] In step S110, the brake control module 2 sends a mode switching command to the vehicle pedal simulation device 3 in response to the received driving mode information.

[0091] In step S120, after the vehicle pedal simulation device 3 responds to the mode switching command, it switches the working mode and sends the first feedback information and the second feedback information to the brake control module 2.

[0092] In step S130, the brake control module 2 responds to the first feedback information and the second feedback information and sends working mode matching information to the driving mode management module 1, and the brake control module 2 switches the pressure build-up and sends a mode switching prompt information to the display panel 5.

[0093] In step S140, the display panel 5 receives the mode switching prompt information sent by the brake control module 2 and displays the screen.

[0094] Thus, the brake control module 2 controls the vehicle pedal simulation device 3 to switch to the corresponding working mode (e.g., the first driving mode corresponds to the first working mode, and the second driving mode corresponds to the second working mode) by receiving the driving mode information, so as to provide the driver with different pedal feel in different driving modes.

[0095] In one embodiment of this disclosure, the control method for the vehicle braking system further includes:

[0096] In step S200, the wheel speed sensing module 4 sends the wheel speed detection value to the brake control module 2;

[0097] In step S210, the brake control module 2 receives the wheel speed detection value sent by the wheel speed sensing module 4 and matches the wheel speed detection value with the speed gear. When the speed gear does not match the working mode, it sends a mode switching command to the vehicle pedal simulation device 3.

[0098] In step S220, after the vehicle pedal simulation device 3 responds to the mode switching command, it switches the working mode and sends the first feedback information and the second feedback information to the brake control module 2.

[0099] In step S230, the braking control module 2 switches the pressure build-up in response to the first feedback information and the second feedback information, and sends a mode switching prompt to the display panel 5.

[0100] In step S240, the display panel 5 receives the mode switching prompt information sent by the brake control module 2 and displays the screen.

[0101] Thus, the braking control module 2 controls the vehicle pedal simulation device 3 to switch to the corresponding working mode (e.g., the low speed gear corresponds to the second working mode, and the high speed gear corresponds to the first working mode) by receiving the wheel speed detection value, so as to provide the driver with different pedal feel at different speed gears and ensure driving safety.

[0102] In one embodiment of this disclosure, the control method for the vehicle braking system further includes:

[0103] In step S300, the temperature sensing component 6 sends the temperature detection value to the braking control module 2;

[0104] In step S310, the braking control module 2 receives the temperature detection value sent by the temperature sensing component 6 and compares the temperature detection value with the preset temperature value; when the temperature detection value is less than the preset temperature value and the control unit 323 is in the second working mode, the braking control module 2 sends a mode switching command to the control unit 323.

[0105] In step S320, after the vehicle pedal simulation device 3 responds to the mode switching command, it switches the working mode and sends the first feedback information and the second feedback information to the brake control module 2.

[0106] In step S330, the braking control module 2 switches the pressure build-up in response to the first feedback information and the second feedback information, and sends a mode switching prompt to the display panel 5.

[0107] In step S340, the display panel 5 receives the mode switching prompt information sent by the brake control module 2 and displays the screen.

[0108] Thus, the brake control module 2 controls the vehicle pedal simulation device 3 to switch to the corresponding working mode based on the received temperature detection value (for example, when the temperature detection value is less than the preset temperature value, it switches to the first working mode, and when the temperature detection value is greater than the preset temperature value, it switches to the second working mode), so as to provide the driver with a more comfortable pedal feel in lower ambient temperatures and improve driving safety.

[0109] This disclosure also provides a control method for a vehicle pedal simulation device, applied to the aforementioned vehicle pedal simulation device 3, the control method for the vehicle pedal simulation device including:

[0110] The control unit 323 responds to the mode switching command sent by the braking control module 2 and controls the control valve 322 to open the oil circuit corresponding to the working mode; wherein, the first working mode corresponds to the first driving mode and the second working mode corresponds to the second driving mode; or, the first working mode corresponds to the low gear and the second working mode corresponds to the high gear; or, the first working mode corresponds to the case where the temperature detection value is less than the preset temperature value and the second working mode corresponds to the case where the temperature detection value is not less than the preset temperature value.

[0111] Thus, the control unit 323 controls the control valve 322 to open different oil circuits according to the mode switching command, so as to switch to the working mode corresponding to the oil circuit, thereby providing the driver with different pedal feel.

[0112] In one embodiment of this disclosure, the vehicle pedal simulation device 3 further includes a temperature sensing component 6, which detects the ambient temperature and sends a temperature detection value. The brake control module 2 is further configured to receive the temperature detection value sent by the temperature sensing component 6 and compare the temperature detection value with a preset temperature value; when the temperature detection value is less than the preset temperature value and the control unit 323 is in a second operating mode, the brake control module 2 sends a mode switching command to the control unit 323. The control method for the vehicle pedal simulation device further includes:

[0113] Temperature sensing component 6 detects ambient temperature and sends the temperature detection value to braking control module 2;

[0114] When the temperature detection value is lower than the preset temperature value, and the operating mode of the control unit 323 is the second operating mode, the control valve 322 is switched to the first operating mode; the oil pressure in the first operating mode is lower than the oil pressure in the second operating mode; correspondingly, the pedal force in the first operating mode is lower than the pedal force in the second operating mode.

[0115] In this way, the ambient temperature is detected by the temperature sensing component 6 inside the vehicle pedal simulation device 3, so as to automatically switch the working mode in low temperature environment, which helps to improve the comfort of pedal feel.

[0116] It should be noted that although the control methods of the vehicle pedal simulation device and the vehicle braking system in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0117] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A vehicle pedal simulation device, characterized in that, include: The simulation assembly includes a simulation cylinder and a simulation piston located within the simulation cylinder, the simulation piston dividing the interior of the simulation cylinder into a first simulation chamber and a second simulation chamber; The pressure control component is connected to the first simulation chamber through multiple oil circuits and can control the oil pressure input to the first simulation chamber through each of the oil circuits; the pressure control component can switch between multiple operating modes, and the oil circuits opened by the pressure control component are different in different operating modes, and the oil pressure of the different oil circuits is different; The brake pedal is connected to the pressure control component and is used to control the pressure control component to input brake fluid into the first simulation chamber through the oil circuit.

2. The vehicle pedal simulation device according to claim 1, characterized in that, The pressure control component includes: A brake cylinder includes a brake cylinder body and a first brake piston located within the brake cylinder body; the first brake piston divides the brake cylinder body into a brake air chamber and a brake oil chamber along the axial direction of the brake cylinder body; the first brake piston is connected to the brake pedal via a piston rod extending out of the brake air chamber; the brake oil chamber is connected to the first simulated chamber via multiple oil passages; Control unit; A control valve is connected to a plurality of the oil circuits and is used, under the control of the control unit, to open one of the oil circuits in any one of the operating modes; the oil circuit opened by the control valve is different in different operating modes.

3. The vehicle pedal simulation device according to claim 2, characterized in that, The brake cylinder further includes a second brake piston, which is located in the brake fluid chamber and divides the brake fluid chamber into multiple sub-chambers, one of which is connected to the control valve; the operating mode includes a first operating mode and a second operating mode, and the oil circuit includes a first oil circuit and a second oil circuit; The portion of the first oil circuit connecting the control valve and the first simulation chamber is provided with a first throttling device, and the portion of the second oil circuit connecting the control valve and the first simulation chamber is provided with a second throttling device. In the first operating mode, the control valve opens the first oil circuit; in the second operating mode, the control valve opens the second oil circuit.

4. The vehicle pedal simulation device according to claim 3, characterized in that, The first throttling element has a first channel through which the brake fluid flows, and the second throttling element has a second channel through which the brake fluid flows, wherein the inner diameter of the first channel is larger than the inner diameter of the second channel.

5. The vehicle pedal simulation device according to claim 3, characterized in that, The sub-oil chamber includes a first sub-oil chamber and a second sub-oil chamber; the first sub-oil chamber is provided with a first elastic element, which is used to apply a force to the second brake piston to move towards the bottom of the brake cylinder; the second sub-oil chamber is provided with a second elastic element, which is used to apply a force to the second brake piston to prevent it from moving towards the bottom of the brake cylinder.

6. The vehicle pedal simulation device according to claim 2, characterized in that, The brake cylinder further includes a second brake piston, which is located within the brake fluid chamber and divides the brake fluid chamber into a first sub-chamber and a second sub-chamber. The first sub-chamber is provided with a first elastic element, which applies a force to the second brake piston to move it toward the bottom of the brake cylinder. The second sub-chamber is provided with a second elastic element, which applies a force to the second brake piston to resist its movement toward the bottom of the brake cylinder. The initial force of the first elastic element is less than the initial force of the second elastic element. The working mode includes a first working mode and a second working mode, and the oil circuit includes a first oil circuit and a second oil circuit; the part of the first oil circuit that connects the first sub-oil chamber and the control valve is independent of the part of the second oil circuit that connects the second sub-oil chamber and the control valve. In the first operating mode, the control valve connects the first oil circuit; in the second operating mode, the control valve connects the second oil circuit.

7. The vehicle pedal simulation device according to claim 2, characterized in that, The vehicle pedal simulation device also includes a temperature sensing component, which is used to detect the ambient temperature and send the temperature detection value to the brake control module. The control unit is used to switch the operating mode in response to the mode switching command issued by the braking control module.

8. The vehicle pedal simulation device according to any one of claims 5 to 6, characterized in that, The vehicle pedal simulation device also includes a brake fluid tank; the brake fluid tank includes a first fluid chamber and a second fluid chamber that are connected, the first fluid chamber being connected to a first sub-fluid chamber, and the second fluid chamber being connected to the second sub-fluid chamber.

9. The vehicle pedal simulation device according to any one of claims 1 to 7, characterized in that, The simulation assembly also includes a third elastic element located in the second simulation cavity, the third elastic element being used to apply a force to the simulated piston to impede its movement toward the bottom of the simulated cylinder.

10. The vehicle pedal simulation device according to any one of claims 2 to 7, characterized in that, The brake cylinder is equipped with a stroke sensor, which is configured to detect the stroke of the piston rod and send stroke information to the control unit.

11. A control method for a vehicle pedal simulation device, applied to the vehicle pedal simulation device according to any one of claims 1 to 10, characterized in that, The control method includes: Detect ambient temperature; When the temperature detection value is lower than the preset temperature value, and the pressure control component is in the second working mode, the pressure control component is switched to the first working mode; the oil pressure in the first working mode is lower than the oil pressure in the second working mode.

12. A control method for a vehicle pedal simulation device, applied to the vehicle pedal simulation device according to any one of claims 1 to 10, characterized in that, The control method includes: In response to driving mode information, a mode switching command is sent to the control unit; the driving modes include a first driving mode and a second driving mode; In response to the mode switching command, the pressure control component is switched to the corresponding operating mode, and the first operating mode corresponds to the first driving mode, and the second operating mode corresponds to the second driving mode.

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