Brake-by-wire system and vehicle power supply system

Abstract

The application relates to the technical field of brake-by-wire, and particularly provides a brake-by-wire system and a whole vehicle power supply system, which are aimed at solving the problem of easily introducing additional voltage loss in the process of detecting faults of the brake-by-wire system. For the purpose, the brake-by-wire system provided by the application comprises an electromechanical brake unit provided with a power supply monitoring module, a processor, at least one power supply circuit and a power supply switching module arranged on the power supply circuit; the power supply monitoring module is connected with internal nodes of the power supply switching module and the processor, the working state of the power supply switching module can be determined in real time and effectively based on the internal node voltage of the power supply switching module by collecting the internal node voltage, and the processor can timely adjust the power supply switching module based on the working state, so that the additional components on the power supply circuit are not needed while the safety of the brake-by-wire system is ensured, and the additional voltage loss can be avoided.

Description

Technical Field

[0001] This application relates to the field of brake-by-wire technology, specifically to a brake-by-wire system and a vehicle power supply system. Background Technology

[0002] Brake-by-wire systems are a core component of new energy vehicles and autonomous driving platforms, and are a key factor affecting vehicle dynamic safety. Brake-by-wire systems, such as electromechanical braking systems (EMB), transmit braking commands via electrical signals. The brake pedal can be completely decoupled from the vehicle's braking system, and its safety requires greater attention.

[0003] Related technologies require the installation of components such as series sampling resistors on the power supply line of the linear braking system to detect faults in the linear braking system, but this approach is prone to introducing additional voltage losses. Utility Model Content

[0004] In order to overcome the above-mentioned defects, this application is made to solve or at least partially solve the technical problem that fault detection of line-controlled braking systems easily introduces additional voltage losses.

[0005] In a first aspect, a brake-by-wire system is provided, comprising at least one electromechanical braking unit, the electromechanical braking unit comprising a power monitoring module, a processor, at least one power supply line, and a power switching module disposed on the power supply line;

[0006] The power monitoring module is connected to the internal node of the power switching module and the processor, respectively.

[0007] The processor is connected to the power switching module.

[0008] In some embodiments, the power switching module includes a drive controller and two transistors, the two transistors being connected in series with a common source on the power supply line, and the body diodes of the two transistors being configured in reverse.

[0009] The drains of the two transistors and the common node between the two transistors are respectively connected to the power monitoring module, and the internal node includes the drains of the two transistors and the common node.

[0010] The drive controller is connected to the processor and the control electrodes of the two transistors respectively.

[0011] In some embodiments, the power switching module further includes an overcurrent and overload detection chip, which is connected in parallel with two transistors, and the signal output terminal of the overcurrent and overload detection chip is connected to the drive controller.

[0012] In some embodiments, the processor is also connected to the vehicle power supply unit.

[0013] In some embodiments, each electromechanical braking unit is provided with two power supply lines, two power monitoring modules, and two power switching modules. The two power supply lines are used to provide redundant power supply to the same electromechanical braking unit, and the power monitoring modules and the power switching modules are each configured in a one-to-one correspondence with the power supply lines.

[0014] In a second aspect, this application provides a vehicle power supply system, which includes a vehicle power supply unit and a brake-by-wire system as described in any of the preceding claims, wherein the vehicle power supply unit is used to supply power to the brake-by-wire system.

[0015] In some embodiments, the vehicle power supply unit includes a power battery and a power converter, wherein the input terminal of the power converter is connected to the power battery and the output terminal of the power converter is connected to the brake-by-wire system.

[0016] In some embodiments, the vehicle power supply system further includes a battery, which is connected to both the brake-by-wire system and the vehicle power supply unit.

[0017] In some embodiments, two batteries are provided, and the two batteries are respectively connected to the vehicle power supply unit.

[0018] In some embodiments, each electromechanical braking unit includes a main power supply interface and an auxiliary power supply interface. In each electromechanical braking unit, the main power supply interface is connected to the battery that is closest to the other of the two batteries, and the auxiliary power supply interface is connected to the battery that is farther away from the other of the two batteries.

[0019] The above-described one or more technical solutions of this application have at least the following beneficial effects:

[0020] In the brake-by-wire system provided in this application, the power monitoring module is connected to the internal nodes of the power switching module and the processor, respectively. By collecting the voltage of the internal nodes of the power switching module, the working status of the power switching module can be determined in real time and effectively. The processor can adjust the power switching module in a timely manner based on the working status, thereby ensuring the safety of the brake-by-wire system without the need to install additional components on the power supply line, which helps to avoid introducing additional voltage loss. Attached Figure Description

[0021] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a brake-by-wire system provided in an embodiment of this application;

[0023] Figure 2 This application is based on Figure 1 A schematic diagram of another line-controlled braking system is provided;

[0024] Figure 3 This is a schematic diagram of a wire-controlled braking system with two power supply lines provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a brake-by-wire system with multiple electromechanical braking units provided in an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a vehicle power supply system provided in an embodiment of this application. Detailed Implementation

[0027] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0028] In the description of this application, "unit," "module," and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, and memory, and may also include software components such as program code, or a combination of software and hardware. A processor can be a microprocessor or any other suitable processor with data and / or signal processing capabilities, and can be implemented in software, hardware, or a combination of both. Terms such as "connection" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0029] The brake-by-wire system provided in this application may include at least one electromechanical braking unit, which includes a power monitoring module, a processor, at least one power supply line, and a power switching module disposed on the power supply line.

[0030] The power monitoring module is connected to both the internal nodes of the power switching module and the processor; the processor is connected to the power switching module. The power monitoring module collects the voltage of the internal nodes of the power switching module, determines the operating status of the power switching module based on the internal node voltage, and transmits control commands to the processor based on the operating status; the processor responds to the control commands and adjusts the power switching module accordingly.

[0031] See Figure 1 As shown, Figure 1 This is a schematic diagram of a brake-by-wire system provided in an embodiment of this application, which exemplarily shows the case where there is only one electromechanical braking unit and only one power supply line.

[0032] The power switching module includes a drive controller and two transistors. The two transistors are connected in series with their common source terminals on the power supply line, and their body diodes are configured in reverse. This back-to-back connection of the two transistors prevents reverse power connection.

[0033] In some embodiments, the transistor may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0034] The internal node includes the drains of two transistors and the voltage of a common node. The power monitoring module is connected to the drains of the two transistors and the common node between them, respectively, to determine the operating state of the two transistors based on the voltages of their drains and the common node. In some embodiments, when the operating state is faulty, the power monitoring module transmits a fault command to the processor; when the operating state is normal, it maintains the current state.

[0035] In some embodiments, such as Figure 1As shown, the power monitoring module can be connected to the drain of a transistor via node a, with node b as the common node, and can be connected to the drain of another transistor via node c. The power monitoring module determines the operating state of the two transistors based on the drains of the two transistors and the voltage of the common node. Specifically, it compares a first difference between the voltage at node a and the voltage at node b with a first voltage threshold, and a second difference between the voltage at node b and the voltage at node c with a second voltage threshold. When the first difference is greater than the first voltage threshold, the transistor located between nodes a and b is determined to be faulty; otherwise, the corresponding transistor is considered to be operating normally. When the second difference is greater than the second voltage threshold, the transistor located between nodes b and c is determined to be faulty; otherwise, the corresponding transistor is considered to be operating normally. The first and second voltage thresholds can be flexibly set according to actual needs. A faulty operating state can refer to a transistor failing to function properly, such as being disconnected when conduction is required. In other embodiments, it may also include situations where conduction occurs when it needs to be cut off, or situations where a short circuit occurs. Accordingly, the power monitoring module can confirm whether abnormal conduction or short circuit has occurred based on the voltage of the above three nodes and the judgment scheme.

[0036] The drive controller is connected to the processor and the gate of each of the two transistors, respectively, and is used to adjust the conduction or cutoff of the two transistors in response to control commands forwarded by the processor. Specifically, the drive controller is connected to the gate of each of the two transistors, respectively, to provide an effective or ineffective operating level to the gate of each transistor. When an effective operating level is provided, the corresponding transistor is turned on; when an ineffective operating level is provided, the corresponding transistor is turned off.

[0037] In this embodiment, the voltage of the drain of the two transistors and the common node between the two transistors are collected by the power monitoring module. The operating status of the two transistors is determined based on the collected voltage. This can determine whether the two transistors are faulty in real time and effectively. While ensuring the safety of the line-controlled braking system, it can avoid setting up additional components, which is beneficial to saving space and cost.

[0038] See Figure 2 As shown, Figure 2 This application is based on Figure 1 Another schematic diagram of the control system structure is provided, in which the power switching module also includes an overcurrent and overload detection chip. The overcurrent and overload detection chip is connected in parallel with two transistors, and the signal output terminal of the overcurrent and overload detection chip is connected to the drive controller to collect the voltage difference between the two drains of the two transistors. Based on the voltage difference, it is determined whether there is an overcurrent or short circuit in the current power supply line. If so, a fault command is sent to the drive controller.

[0039] In some embodiments, given the sum of the on-resistances of the two transistors and the current threshold on the power supply line under normal operating conditions, the overcurrent and overload detection chip can determine the real-time current in the current power supply circuit based on the voltage difference between the two drains and the sum of the on-resistances. The real-time current is then compared with the current threshold. If the comparison result is greater than the threshold, it can be determined that there is an overcurrent or short circuit in the current power supply line. In other embodiments, the overcurrent and overload detection chip can also compare the voltage difference between the two drains with the voltage threshold between the drains of the two transistors under normal operating conditions. If the difference is greater than the threshold, it is determined that there is an overcurrent or short circuit in the current power supply line.

[0040] The drive controller is also used to control the two transistors to turn off in response to fault commands sent by the overcurrent and overload detection chip.

[0041] In some embodiments, the processor is also connected to the vehicle power supply unit to collect electrical signals from the vehicle power supply unit, determine whether the vehicle power supply unit is faulty based on the electrical signals, and if so, control the power switching module to shut down; wherein, the vehicle power supply unit is used to supply power to the power supply line.

[0042] It should be noted that this embodiment can be based on the above. Figure 1 or Figure 2 Implementation of the corresponding embodiment.

[0043] The vehicle power supply unit may include a power battery and a power converter such as a DC-DC converter. The power battery provides high voltage to the vehicle, and the power converter, connected to the power battery, converts the high-voltage electricity from the power battery to a low voltage to supply power to the brake-by-wire system. Specifically, the processor may be connected to the output of the power converter, acquiring electrical signals from the vehicle power supply unit through the output. This facilitates timely control of the power switching module to cut off power to the brake-by-wire system in case of a fault in the vehicle power supply unit.

[0044] In some embodiments, see Figure 3 As shown, Figure 3 This is a schematic diagram of a wire-controlled braking system with two power supply lines provided in an embodiment of this application. Figure 3 Corresponding embodiments can be based on Figure 2 In the corresponding embodiment, each electromechanical braking unit is equipped with two power supply lines, two power monitoring modules, and two power switching modules. The two power supply lines are used to provide redundant power supply to the same electromechanical braking unit, and the power monitoring modules and power switching modules are configured one-to-one with the power supply lines.

[0045] In some embodiments, there are two processors, with each processor corresponding to a power supply line.

[0046] When two power supply lines are provided, one can be used as the main power supply line and the other as the auxiliary power supply line. When the main power supply line is in power supply mode, the power monitoring module, processor, and power switching module corresponding to the main power supply line can execute... Figure 2 The corresponding module in the corresponding embodiment can perform the following functions: when any one of the power monitoring module, processor, and overcurrent / overload detection chip detects a fault, it controls the two transistors set on the main power supply line to be turned off, so as to stop the power supply through the main power supply line.

[0047] When the main power supply line fails, power can be switched to the auxiliary power supply line. The auxiliary power supply line is equipped with a power monitoring module, processor, and power switching module capable of executing... Figure 2 The corresponding module in the corresponding embodiment can perform the following functions: when any one of the power monitoring module, processor, and overcurrent / overload detection chip detects a fault, it controls the two transistors set on the auxiliary power supply line to be turned off, so as to stop the power supply through the auxiliary power supply line.

[0048] In some embodiments, multiple electromechanical braking units may be provided, see [reference] Figure 4 As shown, Figure 4 This is a schematic diagram of a brake-by-wire system with multiple electromechanical braking units provided in an embodiment of this application. The multiple electromechanical braking units can be configured one-to-one with the wheel ends of a vehicle, including a front axle EMB unit 100 and another front axle EMB unit 102 corresponding to the two front wheels, and a rear axle EMB unit 101 and another rear axle EMB unit 103 corresponding to the two rear wheels. Each of the front axle EMB unit 100, the other front axle EMB unit 102, the rear axle EMB unit 101, and the other rear axle EMB unit 103 can be equipped with... Figure 3 Corresponding to the modules in the embodiments and implementing the same function, each electromechanical braking unit (i.e., any one of 100-103) and Figure 3 The main difference in the corresponding embodiment is that the two power supply lines share a single processor.

[0049] In some embodiments, such as Figure 4 As shown, each electromechanical braking unit (i.e., any one of 100-103) may also be equipped with a power supply processing module, which is connected to the power switching module on the two power supply lines respectively. After the power supply module processing module is powered on, the corresponding electromechanical braking unit completes the preparation of the energy supply channel.

[0050] In some embodiments, such as Figure 4As shown, each electromechanical braking unit (i.e., any one of 100-103) can also be provided with two power supply interfaces and a logic power processing module. The power supply interfaces correspond one-to-one with the power supply lines, and the logic power processing module is connected to the two power supply interfaces respectively to provide logic power to the processor based on the two power supply interfaces.

[0051] Another aspect of this application provides a vehicle power supply system, including a vehicle power supply unit and a brake-by-wire system as described above, wherein the vehicle power supply unit is used to supply power to the brake-by-wire system.

[0052] The vehicle power supply unit includes a power battery and a power converter. The input of the power converter is connected to the power battery, and the output of the power converter is connected to the brake-by-wire system. It is used to convert the voltage provided by the power battery and supply power to the brake-by-wire system based on the converted voltage. The processor in the brake-by-wire system is used to collect the electrical signal at the output of the power converter.

[0053] In some embodiments, the vehicle power supply system further includes a battery connected to both the brake-by-wire system and the vehicle power supply unit, for supplying power to the brake-by-wire system; the vehicle power supply unit also supplies power to the battery, see [reference needed]. Figure 5 As shown, Figure 5 This is a schematic diagram of a vehicle power supply system provided in an embodiment of this application. The power converter is a DC-DC converter.

[0054] The vehicle power supply unit can serve as the main power supply, while the battery can serve as the auxiliary power supply.

[0055] like Figure 5 As shown, the vehicle power supply system may also include a central intelligent power distribution controller and a power distribution unit. The central intelligent power distribution controller is located between the power converter and the brake-by-wire system. Based on the current vehicle operating conditions, it can supply the power output from the power converter to the brake-by-wire system via the main power supply line, or it can convert the power output from the power converter and then supply it to the brake-by-wire system via the main power supply line. The power distribution unit is connected to the battery, the central intelligent power distribution controller, and the brake-by-wire system, respectively, and is used to distribute the power supplied by the battery to the brake-by-wire system via an auxiliary power supply line.

[0056] In other embodiments, two batteries are provided, each connected to the vehicle power supply unit to provide redundant power to each electromechanical braking unit in the brake-by-wire system. Specifically, the two batteries can be connected to a power converter respectively.

[0057] Each electromechanical braking unit includes a main power supply interface and an auxiliary power supply interface. In each unit, the main power supply interface is connected to the battery that is closest to the other battery, and the auxiliary power supply interface is connected to the battery that is furthest from the other battery. This effectively reduces voltage drop losses during power supply and minimizes energy consumption.

[0058] See Figure 4 As shown, Figure 4 A schematic diagram of a vehicle power supply system corresponding to another embodiment of this application is also shown. The two batteries may include a front low-voltage battery 001 and a rear low-voltage battery 002. The front low-voltage battery 001 is positioned close to the front axle EMB unit 100 and another front axle EMB unit 102, while the rear low-voltage battery 002 is positioned close to the rear axle EMB unit 101 and another rear axle EMB unit 103. The main power supply interfaces of both the front axle EMB unit 100 and the other front axle EMB unit 102 are connected to the front low-voltage battery 001, which serves as the main power supply. The auxiliary power supply interfaces of both the front axle EMB unit 100 and the other front axle EMB unit 102 are connected to the rear low-voltage battery 002, which serves as the auxiliary power supply. The main power supply interfaces of the rear axle EMB unit 101 and the other rear axle EMB unit 103 are both connected to the rear low-voltage battery 002, with the rear low-voltage battery 002 serving as the main power supply; the auxiliary power supply interfaces of the rear axle EMB unit 101 and the other rear axle EMB unit 103 are both connected to the front low-voltage battery 001, with the front low-voltage battery 001 serving as the auxiliary power supply.

[0059] The technical solution of this application has been described in conjunction with the embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A brake-by-wire system characterized by, It includes at least one electromechanical braking unit, the electromechanical braking unit including a power monitoring module, a processor, at least one power supply line and a power switching module disposed on the power supply line; The power monitoring module is connected to the internal node of the power switching module and the processor, respectively. The processor is connected to the power switching module.

2. The brake-by-wire system according to claim 1, characterized by, The power switching module includes a drive controller and two transistors. The two transistors are connected in series with a common source on the power supply line, and the body diodes of the two transistors are configured in reverse. The drains of the two transistors and the common node between the two transistors are respectively connected to the power monitoring module, and the internal node includes the drains of the two transistors and the common node. The drive controller is connected to the processor and the control electrodes of the two transistors respectively.

3. The brake-by-wire system according to claim 2, characterized by The power switching module also includes an overcurrent and overload detection chip, which is connected in parallel with two transistors, and the signal output terminal of the overcurrent and overload detection chip is connected to the drive controller.

4. The brake-by-wire system according to claim 2, characterized by, The processor is also connected to the vehicle's power supply unit.

5. The brake-by-wire system according to any one of claims 1 to 3, characterized in that, Each electromechanical braking unit is equipped with two power supply lines, two power monitoring modules, and two power switching modules. The two power supply lines are used to provide redundant power to the same electromechanical braking unit. The power monitoring modules and the power switching modules are configured one-to-one with the power supply lines.

6. A system for supplying power to a vehicle, characterized by The system includes a vehicle power supply unit and a brake-by-wire system as described in any one of claims 1 to 5, wherein the vehicle power supply unit is used to supply power to the brake-by-wire system.

7. The system of claim 6, wherein, The vehicle power supply unit includes a power battery and a power converter. The input terminal of the power converter is connected to the power battery, and the output terminal of the power converter is connected to the brake-by-wire system.

8. The system of claim 6, wherein, The vehicle power supply system also includes a battery, which is connected to both the brake-by-wire system and the vehicle power supply unit.

9. The on-board electrical power supply system of claim 8, wherein There are two batteries, and each battery is connected to the vehicle power supply unit.

10. The system of claim 9, wherein, Each electromechanical braking unit includes a main power supply interface and an auxiliary power supply interface. In each electromechanical braking unit, the main power supply interface is connected to the battery that is closest to the other of the two batteries, and the auxiliary power supply interface is connected to the battery that is farther away from the other of the two batteries.

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